Dhofar 2014 Capability Statement - Oman Electricity Transmission

Transcription

Five-Year Annual
Transmission
Capability Statement
(2014-2018)-Dhofar
System
2014
Issue: October 2014
As Approved by the Authority for Electricity Regulation
Five-Year Annual Transmission Capability Statement (2014 - 2018)-Dhofar System
Preface
This Transmission Capability Statement is provided by the Oman Electricity Transmission
Company according to Transmission and Dispatch Licence Condition number 27 and the Grid
Code / Planning Code. The Statement describes in detail Dhofar transmission system capability
over the coming five years 2014-2018. The Statement provides up-to-date transmission system
data in order to identify those parts of the system, which offer the opportunity for future
development of existing and potential users of the system.
In this Capability Statement, the results of load flow and short circuit analysis are presented based
on the planned system expansion reinforcement to meet the demand forecast provided by the
Oman Power and Water Procurement Company and the DPC. The OETC grid model has been
updated to include new project schedule, demand foecast, generation data and system data. A total
of 7 transmission projects are planned in Dhofar area over the five years period, most of projects
are designed to increase the transmission system capacity so that it can meet future growth in
demand and satisfy the security criteria.
The existing and planned development in the generation and transmission system is described,
including introduction of new power plants: 400MW at Salah-2 IPP in 2018.
Eng. Ali Said Al Hadabi
Chief Executive Officer
Oman Electricity Transmission Company
Page | 1
Contents
Preface
1
List of Figures
4
List of Tables
5
Document History and Status
6
1. Executive Summary
7
2. Introduction
10
2.1 Licence Conditions, Codes and Standards
10
2.2 2014 System Development at Dhofar
10
3. Technical Requirements for Compliance with the Grid Code and Licence
11
3.1. System Frequency
11
3.2. System Voltage
11
3.3. Security of Supply
12
4. OETC System Design and Planning Standards
13
4.1 Oman Electrical Standard OES 11
13
4.2 Oman Electrical Standard OES 25A and 25B
13
13
13
5. OETC Transmission System
14
5.1 Existing 132kV Transmission System
14
5.2 Future System Development Projects
15
5.2.1 Projects Completed to Meet the 2014 Peak Demand
15
5.2.2 Projects Expected to be Completed to Meet the 2016 Peak Demand
15
5.2.3 Projects Expected to be Completed to Meet the 2017 Peak Demand
15
5.3 Summary
6. Existing and Planned Developments in Generation
15
21
6.1 Existing Generation
21
6.2 Planned Future Generation (2014 – 2018)
23
6.3 Interconnections
23
6.3.1 Interconnection with PDO
23
6.4 Economic Dispatch
24
6.5 Spinning Reserve
24
7. Demand Forecast and Generation Availability
25
7.1 System Demand
25
7.2 Demand Forecast
27
7.3 System Maximum Demand Forecast and Generation Availability
28
8. Transmission System Performance
30
8.1 Power Flow and Voltage Profiles
30
8.2 Fault Levels
38
9. Development Opportunities
40
9.1 Review of the Generation Versus Load Balance on an Area Basis
40
9.2 Available Grid Station Capacity
44
Page | 2
10. Derogations
45
Appendix A Review of Future Developments
48
A.1 Summery of projects to be completed annually between 2014-2018 peak demand
48
A.2 Projects expected to be completed to meet the 2014 peak demand
48
A.3 Projects expected to be completed to meet the 2016 Peak Demand
48
A.4 Projects expected to be completed to meet the 2017 peak demand
49
Appendix B Transmission System data
50
B.1 Substations Loads and Capacitor data
50
B.2 Overhead Line Circuit Capacities and Parameters
50
B.3 Transformer data
50
Appendix C Power System Studies
54
C.1 Summary of Load Flow Study results
54
C.2 Summary of Fault Level Study results
54
C.3 Diagrames of the model for the Load Flow Study Results
54
Page | 3
List of Figures
Figure 1: Dhofar existing transmission system in 2014
16
Figure 2: Expected development by 2015
17
18
19
20
Figure 6: Dhofar System Load on 2013 Peak Day
25
Figure 7: Dhofar System Load on 2013 Minimum Load Day
26
Figure 8: Reduction of number of out-of-firm transformers during 2014-2018
33
Figure 9: Voltage profile at SFZ Grid Station.
34
Figure 10: Voltage profile (p.u.) at Ittin Grid Station
35
Figure 11: Voltage profile (p.u.) at Al Qarm Grid Station
36
Figure 12: Transmission power losses at peak demand of the years 2014-2018
37
Figure 13: Peak load growth over the period 2014-2018
38
Figure 14: Future Dhofar Transmission System (2018)
41
Figure 15: Generation and load balance in Dhofar area
43
Figure 16 : Used and available MVA in Dhofar area at 2018 peak demand
44
Figure C.1 Dhofar Transmission System 2014 Max. Load Flow Condition
66
61
62
63
64
Page | 4
List of Tables
Table 1: Summary of Planned Developments on Dhofar Transmission System (2014-2018)
9
Table 2: Existing and Committed Future Generating Capacity
22
Table 3: New Contracted and Planned Generating Capacity
23
Table 4: Centrally Dispatched Generating Capacity on OETC Transmission System
23
Table 5: Historic Growth in Peak Demand (2003 – 2013)
26
Table 6: Expected oad Transfers between Grid Supply Points (2014- 2018)
28
Table 7: Dhofar Transmission System Demand Forecast by Grid Station
28
Table 8: Comparison of Demand Forecast with Available Generating Capacity including Planned Retirements
29
Table 9: Summary of Connected Generation used in Load Flow Studies of Maximum Demand
31
Table 10: Summary of Connected Generation used in Load Flow Studies of Minimum Demand
31
Table 11: Estimated Power Surplus and Power Deficit on an Area Basis (2014-2018)
42
Table 12: Available Grid Station Capacity of more than 10 MVA in 2018
44
Table 13 (A): Expected Grid stations132/33kV which will not comply with Transmission Security Standard
at peak demand in 2014
(First Outage)
47
Table 13 (B): Expected Grid stations 132/33kV which will not comply with Transmission Security Standard (Second
Outage) at Maintanance Period in 2014
47
Table B.1: Load and Capacitor Data for Grid Stations (2014-2018)
51
Table B.2: 2014 Branch Data Listing
52
Table B.3: Progressive Changes to Branch Circuit Data for 2015-2018
52
Table B.4: Grid Stations Transformer Data at peak 2014
53
Table B.5: Grid Stations Transformer Data at from 2016 to 2017
53
Table C.1: Transformer Loading (%) at Grid Station (2014-2018)
55
Table C.2: Available Capacity at Grid Stations (2014-2018) for Connection of New Demand
55
Table C.3: Overhead Line and Cable Circuit Loading (%) at Peak Demand (2014-2018)
56
Table C.4 (a): Transmission System Voltage Profile at Peak Demand (2014- 2018)
56
Table C.4 (b): Transmission system voltage profile at minimum demand (2014-2018)
57
Table C.5: Estimation of Transmission Losses and Generation Margin at Peak Demand (2014-2018)
58
Table C.6: Maximum 3-Phase Short Circuit Fault Levels
59
Table C.7: Maximum 1- Phase Short Circuit Fault Levels
59
Page | 5
Document History and Status
Revision
Date issued
Prepared by
Approved by
Date approved
Revision type
D.0
22/6/2014
Strategic Planning and
Studies Section
Studies Section Head
23/6/2014
First draft
D.1
24/6/2014
Studies Section
Asset Management &
Planning Manager
25/6/2014
First draft
Distribution of Copies
Copy no
Quantity
Date
V.0
Revision
1
1
25/6/2014
Eng. Ali Al Hadabi
Issued to
V.1
1
1
30/6/2014
Final version submitted to the AER for approval
V. 2
1
1
16/9/2014
Final version submitted to the AER for approval
Printed:
16 September 2014
Last saved:
19 October 2014 02:07 PM
Author:
Strategic Planning and Studies Section
Name of organisation:
Oman Electricity Transmission Company S.A.O.C
Name of document:
Five-Year Annual Transmission Capability Statement (2014- 2018) – Dhofar System
Document version:
V. 2 " As Approved by the Authority for Electricity Regulation"
Page | 6
1.
Executive Summary
Dhofar system has been transferred to the Oman Electricity Transmission Company (OETC) on 1st January 2014.
Therefore, this Capability Statement presents the Oman Electricity Transmission Company’s development plans
for the 132kV Dhofar transmission systems for the years 2014 to 2018.
The Statement includes data for the generators, loads, overhead lines, cables, transformers and capacitor banks
used in the development of transmission system models for the power system studies undertaken with OETC’s
DIgSILENT PowerFactory power system analysis software, version 14.1.6, in preparation of this Capability
Statement. The Statement also includes the results of power system analysis of the transmission system that
defines system performance when operating under the extremes of peak and minimum demand in each of the
five years. From this analysis an assessment has been made of the opportunities for the connection of new
generation, new demand and reinofrcment on the system.
Table 1 lists the schedule for committed and planned system development projects on the 132kV transmission
systems, although it should be noted that not all of the projects listed have full authorisation at this time. The
number of 132/33kV grid stations will increase from seven in service at the beginning of 2014 to ten by the
summer peak of 2018.
In accordance with Condition 27 of OETC’s Transmission Licence, the power flow studies presented in this
Capability Statement are based on updated demand forecast data provided by DPC and the updated generation
forecast by Oman Power and Water Procurement Company (OPWP).
To be able to perform the studies and produce the results presented in this statement, the deadline to receive data
from various parties (OPWP, DPC) is as per the Grid Code. Any information received after the deadline will be
included in the next Five-Year Annual Transmission Capability Statement (2015-2019).
The forecast average annual growth in system demand of about 8.32% over the period 2014 –2018 drives many
of the planned grid station reinforcements with a large portion of the additional demand supplied to the DPC
through the 132/33kV grid stations. To meet security of supply requirements and provide load relief to the
heavier loaded grid stations it will be necessary to transfer excess load to the new or existing grid stations.
Furthermore, OPWP submitted a connection application for a new power stations and it has identified the
location to be at Raysut area with 400MW export capacity proposed to be energised by the begning of 2018.
As the demand grows, there is a greater need to extend the 132kV transmission systems and to establish new
132/33kV grid stations in order to relief the loaded grid stations and to avoid overloads, improve voltages and
reduce power losses.
From Table 1 a total of seven transmission projects are planned over the five years period, most of projects are
designed to increase the transmission system capacity so that it can meet future growth in demand and satisfy
the security criteria. This is a major programme of capital investment in its infrastructure that will be spread
across the whole network to improve transmission system performance across southern Oman. Power system
studies presented in this Statement confirm that the planned investment in 132/33kV grid stations and
transmission circuits will provide substantial spare capacity on the transmission systems to well beyond 2018.
Load flow studies have confirmed that the voltage levels across the transmission system can be maintained
within the limits as defined in the Grid Code: (±10% for the 132kV systems) and (±6% for the 33kV system).
Page | 7
The Statement has reviewed the opportunities for the connection of new generation and new demand and
identified those grid stations with substantial spare capacity where it should be possible to connect new demand
to the system.
Section 2 of the Statement provides an introduction to the document, identifying the main related documentation
and the key changes that have taken place on the transmission system since the previous issue of the Statement.
Section 3 identifies the technical requirements of the Grid Code and the Transmission Licence with specific
attention to system voltage, frequency and security of supply.
Section 4 describes the main engineering standards used by OETC in its planning and design of the transmission
system.
Section 5 describes the existing transmission system and summarises the planned developments in each year
over the period 2014 to 2018.
Section 6 identifies the existing and planned developments in generation and describes the interconnections
inside Oman, i.e. PDO.
Section 7 presents the demand forecast and compares this with the generation capacity available.
Section 8 discusses transmission system performance and presents the results of load flow and short-circuits
studies that show the performance of the transmission system at both maximum and minimum peak demand in
each year from 2014 to 2018.
Section 9 identifies the development opportunities for the connection of new demand and new generating plant
to the transmission system.
Section 10 presents the areas of the network where network components will be operating above firm capacity
during the period 2014 to 2018 and identifies the need for new or renewed derogations from application of the
Transmission Security Standard.
Page | 8
Table1: Summary of Planned Developments on Dhofar Transmission System (2014 - 2018)
S.N
Project
1
New Grid Station at Awqad
(2X125MVA)
Expected
Completion Date
Q1 2014
New 132kV Line
2
Status
Energized
Main Equipment
-
2x125MVA Transformers.
8 No. of 132kV GIS.
19 km 132kV OHL Line.
Q2 2016
Under
Construction
-
5 km 132kV UG Cable
(A’Saada-Ashoor)
3
A’Saada (2X125MVA)
Q2 2016
Design
-
8 No. of 132kV GIS.
4
New 132kV Line (A’Saada-Awqad)
Q2 2017
Design
-
Q2 2017
Planning
5
Adding Third &Forth Txs to SFZ
(2X125MVA)
-
2 No. of 132kV GIS.
6
Connection of Salalah-2 IPP
Q2 2017
-
Extension of SFZ 132kV GIS
by adding 10 No. of 132kv GIS.
7
Adding Third &Forth Txs to
A’Saada (2X125MVA)
-
2 No. of 132kV GIS.
Q2 2017
Planning
Planning
Purpose
-
To meet load groth
requirments.
To meet Transmission Security
Standard
-
To fed A’Saada grid station.
Standard
-
To meet load groth requirments
-
Standard
-
To meet load groth
requirments.
Standard
-
-
To connected the new Salalah2 IPP Power Plant
-
To meet load groth
requirments.
Standard
-
Page | 9
2.
Introduction
2.1
Licence conditions, Codes and Standards
This Transmission System Five-Year Capability Statement covers the period 2014 – 2018 for Dhofar
Transmission Network which has been prepared by the Oman Electricity Transmission Company S.A.O.C.
(OETC). This Statement is prepared in accordance with the requirements set down under Licence Condition
27 of the Electricity Transmission and Dispatch Licence granted to the Company on 1 May 2005 by the
Authority of Electricity Regulation (AER). The Licence has been granted under the powers invested in the
Authority by Article (2) of the Law for the Regulation and Privatisation of the Electricity and Related Water
Sector promulgated by Royal Decree 78/2004.
The purpose of the Statement is to provide up-to-date transmission system data for potential and existing
users of the transmission system so they can identify those parts of the transmission system which offer the
opportunity for future development. The Statement is required to be updated annually so that users and
potential users of the transmission system are furnished with the latest information.
Potential users of the transmission system should be aware of the following main documents that influence
the planning and future development of the transmission system infrastructure:
2.2
i)
The Grid Code for the Sultanate of Oman.
ii)
The Electricity Transmission and Dispatch Licence granted to OETC, notably Licence
Condition 26, which defines the requirements for the Security Standards and the
maintaining of an Efficient and Economic Transmission System.
iii)
The approved Transmission Security Standards prepared in accordance with Condition 26 of
OETC’s Transmission and Dispatch Licence.
iv)
The Statement of Charges for Connection to the OETC Electricity Transmission System.
v)
The Statement of Charges for the Use of the OETC Electricity Transmission System.
2014 System Development at Dhofar area
Since the transmission part of Dhofar system has been transferred to the Oman Electricity Transmission
Company (OETC) at beginning of 2014, OETC will prepare the Capability Statement for Dhofar system,
covering the period 2014– 2018, the following project have been completed and energized in time to meet
2014 system peak demand:
1. Awaqad grid station with 19 km over head line.
Page | 10
3. Technical requirements for compliance with the Grid Code and Licence
In order to comply with Condition 26 of the Electricity Transmission and Dispatch Licence the transmission
system must be planned, designed and operated to provide a secure, efficient and economic supply of
electricity that is of an acceptable quality to its users.
Whilst Condition 26 specifically sets out the Security of Supply requirements, the most important
characteristics that determine the quality of supply are frequency and voltage. The requirements for
maintaining transmission system frequency and voltage within specified operating limits are set out in the
Grid Code, and most clearly defined under conditions CC.6.1.1 and CC.6.1.2 respectively of the Connection
Conditions Code.
Other issues that relate to the planning of an economic and cost effective transmission system that provides
a voltage supply of acceptable quality, such as standardisation of equipment ratings, limitation of system
losses, and the control and limitation of disturbing factors that affect the voltage waveform are covered by
relevant Omani and/or International Standards.
3.1 System Frequency
In accordance with condition CC.6.1.1 of the Connection Conditions Code, OETC is required to maintain
System Frequency within the following limits:
a)
During normal operating conditions, the nominal system frequency of the transmission
system shall be 50.00Hz and will be controlled normally between 49.95Hz and 50.05Hz.
b)
During exceptional steady state conditions, frequency deviations will not exceed 49.90Hz to
50.10Hz unless disturbed circumstances prevail.
c)
Under disturbed conditions, system frequency could rise transiently to 51.50 Hz or fall to
48.0 Hz, but not exceed these limits.
As CC.6.1.1 points out, the frequency of the total system is responsive to changes in the balance between
the active power demand and total available generation capacity. OETC must therefore ensure that
sufficient generation capacity and demand is available and connected to the system at all times to respond
automatically to active power imbalances and correct any frequency change.
3.2 System Voltage
In accordance with condition CC.6.1.2 of the Connection Conditions Code, OETC is required to control
system voltage within the following limits:
a)
The voltage on 132kV parts of the Transmission System at each site with a user connection
will remain within the limits of ±10% of the nominal voltage level.
Page | 11
b)
The voltage on the 66kV, 33kV and 11 kV sides of transmission transformers at Connection
Sites with Users will normally remain within the limits of ±6% of the nominal value unless
abnormal conditions prevail.
During some system disturbances, such as where short circuits occur, the voltage could collapse transiently
to zero at the point of fault until the fault is cleared.
Voltage regulation requires both active and reactive power flows across the transmission system to be
carefully controlled. The physical characteristics of the plant on the transmission system also give rise to
the generation and absorption of reactive power. Reactive power flows across the transmission system can
give rise to substantial voltage differences and it is therefore necessary to maintain reactive power balances
between sources of capacity and demand on a “zone” basis.
Unlike frequency, which is consistent across an interconnected transmission system, voltages at different
points on an interconnected system are determined by the local sources of demand and capacity, by the
prevailing network configuration and by the reactive power flows across the network.
The management of voltage requires control of reactive power and centrally dispatched generators,
transformer tap-changers, can provide this by the connection of capacitor banks at 33kV or below, or by
means of static var compensation (SVC).
3.3 Security of Supply
In accordance with Condition 26 of the OETC Transmission Licence the capacity of the Transmission
System to transmit electricity shall not be reduced in the event that a single electric line, cable, transformer,
circuit breaker and/or associated plant is not in service. During a period of which such equipment is out of
service, the operating voltage of the Transmission System may reduce to any level specified for such
purposes in the Grid Code. In effect, the transmission system should be planned and operated to meet the
Transmission Security Standard requirements.
Page | 12
4.
OETC System Design and Planning Standards
In addition to the technical requirements of the Transmission Licence and the Grid Code, the principal
electrical standards used by OETC in its planning and design of the 132kV transmission systems are:
The standard covers the topic “General Specifications for Electrical Materials and Equipment” and defines
the worst case conditions for system design purposes by the following parameters:
a)
maximum ambient temperature (50˚C)
b)
maximum surface temperature for metal surfaces (80˚C)
c)
altitude (between sea level and 30 metres above sea level)
d)
maximum wind velocity (125km per hour)
e)
average annual rainfall (100mm)
f)
maximum relative humidity (100%)
The standard also defines the design parameters for the 132kV systems in terms of highest voltage (145 kV),
design fault level (31.5 kA) and the requirement that the system be solidly earthed.
4.2 Oman Electrical Standard OES 25A and 25B
These standards define the requirements for aluminium conductor steel reinforced and aluminium alloy
conductor overhead lines and aluminium alloy stranded conductor overhead lines.
Volume 1 of the standard covers the design requirements for a 132/33kV, 2 x 125 MVA substation with
132kV gas insulated switchgear, including the 33kV switchgear. Volume 2 covers similar requirements
for the 132/33kV, 2 x 63 MVA substation with 132kV outdoor SF6 switchgear.
The standard covers the design requirements for 132kV double circuit overhead transmission lines with
400mm2 All Aluminium Alloy Twin-Yew Conductors (AAAC) on lattice steel towers that are deployed
across much of the 132kV transmission system.
Page | 13
5.
OETC Transmission System
5.1 Existing Transmission System at Dofar area
On the 1st January 2014 the transmission part of Dhofar system has been transferred to the Oman Electricity
Transmission Company (OETC) which was owned and operated by Dhofar Power Company (DPC). DPC
owne and operate the distribution network (33kV and below) only in Dhofar area.
The Oman Electricity Transmission Company is authorized to undertake all regulated activities of
electricity transmission and dispatch in Dhofar Area at voltages of 132kV and above. The existing
transmission system in south Oman (Dhofar area) is operating voltage at 132kV.
The 132 kV transmission system in Dhofar was commissioned in 2003. It consisted of four 132/33 kV Grid
Stations (GS), with a double circuit 132 kV overhead line running West to East from NPS GS to Ittin GS
and on to Al Qarm GS. From Ittin GS a double circuit 132 kV overhead line runs north to Thumrait GS.
The single line diagram for the transmission network is shown in Figure 6.7. Both double circuits from
NPS to Ittin and from Ittin to Al Qarm are strung with Yew 400 mm2 AAAC conductors, while the double
circuit route to Thumrait is strung with Elm 175 mm2 AAAC.
SFZ 132/33 kV GS was commissioned in 2010 to provide additional transmission capacity for large
industrial customers in the Salalah Free Zone area. The GS is sited near to the NPS Power Station and the
132 kV NPS to Ittin double circuit line is routed through SFZ GS in a loops in and loop out (LI-LO)
arrangement.
The present Dhofar transmission system consists of:

219.95 circuit-km of 132kV overhead transmission lines

5.67 circuit-km of 132kV cables

1312 MVA of 132/33kV transformer capacity

Seven 132/33kV grid stations
The transmission system is supplied with electricity generated from two gas-based power stations located
at NPS & Salalah IWPP. In addition the transmission system may be supplied from direct customers, such
as PDO during the emergency case.
The Distribution Licence holder, at Dhofar area is Dhofar Power Company (DPC), take the bulk of the
power transmitted through the main grid, from the 132/33 kV grid stations.
In addition to the the distribution company, new large private customers will directly connected to the
transmission system. The following existing bulk customer wich is directly connected to Dhofar
transmission system:

Salalah Airport
Page | 14
In 2013, the system gross peak demand was 421.7 MW which occurred at 00:34 hours on 28th May, an
increase of 7.68 % on the 2012 peak demand. During 2013, the Electric Energy Delivered (EED) to the
Dhofar transmission system from connected generating plants & other generators was 2.47 GWh.
5.2
Future System Development Projects
The power system studies presented later in this Capability Statement and used to define the constraints
and opportunities that exist on the transmission system over the next five years have been performed on the
basis that the committed and planned development projects detailed in Appendix A and summarised below
will proceed as planned and be completed to the current schedule.
5.2.1 Projects completed to meet the 2014 peak demand
A geo-schematic diagram of the existing transmission system in 2014 is shown in Figure 1. In section 2.2
of this Statement it was noted that a project had been completed to meet the peak demand in summer 2014.
The project will provide load relief to some of the heavily loaded grid stations and transmission circuits in
addition to improving the voltage profile. The projects designed to meet the 2014 system demand include
a new 132/33kV grid station at Awqad.
5.2.2 Projects expected to be completed to meet the 2016 peak demand
Figure 3 shows in geo-schematic form the system development plan to meet the 2016 system peak demand.
The new projects scheduled for completion in time to meet the summer peak demand in 2016 are at various
stages of development. The projects designed to meet the 2016 system demand include the construction of
new 132/33kV grid stations at Al A’Saada and assoisiated line.
5.2.3
Projects expected to be completed in time to meet the 2017 peak demand
Figure 5 shows in geo-schematic form the system arrangement to meet the 2017 peak demand. The projects
planned to support 2017 network system include the installation of 3rd and 4th transformers at SFZ and
adding the 132kV GIS for the new Salalah-2 power plant (400MW) at SFZ. In addition, upgrading A’Saada
grid station by adding the 3rd and 4th transformers. Also, the construction of 132kV double circuits overhead
line between A’Saada and Awqad grid stations.
5.3 Summary
Table 1 in the Executive Summary has summarised the development plans for the Dhofar Transmission
System on a project by project basis at the time of this Statement. The table identifies the projects to which
OETC are already committed and those projects that are considered likely to proceed. The power system
studies presented later in this Capability Statement to show the expected performance of the transmission
system over the period 2014-2018 have been performed on the basis that the committed and planned
development projects in Table 1 and detailed in Appendix A will proceed as planned and to be completed
on schedule. The system studies are used to identify areas of the transmission system where there are
opportunities for connecting new demand and new generation and where constraints should be applied to
further development.
Page | 15
Figure 1: Dhofar existing transmission system in 2014
Page | 16
Page | 17
Figure
3: Expected development by 2016
Page | 18
Page | 19
Page | 20
6. Existing and Planned Developments in Generation
6.1
Existing generation
Two gas-based power stations supply the Dhofar transmission system in 2014:

NPS Power Plant

Salalah IWPP Power Plant
The two power stations are described briefly below:
a) NPS Power Plant
The initial development of NPS Power Plant started in 2002. The power plant has eight gas turbines which six of
them connectd to 132kV system while the other two are connected to 33kV system. They are operating in opencycle and the gross site rating of the units varies from 15 MW to 36 MW. The net generation capacity of the power
station is approximately 257MW.
b) Salalah IWPP Power Plant
Salalah Power Plant was commissioned in 2010 and developed as an Independent Water and Power Plant (IWPP).
It has six gas turbines installed with rate of 56 MW and two steam turbines with rate of 82 MW. The net generation
capacity of the power station is approximately 445MW.
Page | 21
Table 2 lists on a yearly basis the existing and committed future generating capacity over the period 2014-2018. The table
presents the gross and net maximum capacity for each generating unit at each power station and takes account of the
desalination load where appropriate.
Table 2: Existing and committed future generating capacity
Power Station
NPS Power Plant
Type
Unit
Gas Turbine
2014
2015
2016
2017
2018
GT1
36.0
36.0
36.0
36.0
36.0
Gas Turbine
GT2
36.0
36.0
36.0
36.0
36.0
Gas Turbine
GT3
36.0
36.0
36.0
36.0
36.0
Gas Turbine
GT4
36.0
36.0
36.0
36.0
36.0
Gas Turbine
GT5
36.0
36.0
36.0
36.0
36.0
Gas Turbine
GT6
36.0
36.0
36.0
36.0
36.0
Gas Turbine
GT7
15.0
15.0
15.0
15.0
15.0
Gas Turbine
GT8
26.0
26.0
26.0
26.0
26.0
257
257
257
257
257
Net Generation
Salalah-2 IPP Power Plant
Net Generating Capacity (MW)
Gas Turbine
GT 1
56.0
56.0
56.0
56.0
56.0
Gas Turbine
GT 2
56.0
56.0
56.0
56.0
56.0
Gas Turbine
GT 3
56.0
56.0
56.0
56.0
56.0
Gas Turbine
GT 4
56.0
56.0
56.0
56.0
56.0
Gas Turbine
GT 5
56.0
56.0
56.0
56.0
56.0
Steam Turbine
ST1
82.0
82.0
82.0
82.0
82.0
Steam Turbine
ST2
82.0
82.0
82.0
82.0
82.0
Net Generation
444
444
444
444
444
Net Generation
0
0
0
0
400
Page | 22
Five-Year Annual Transmission Capability Statement (2014-2018)
Planned Future Generation (2014 – 2018)
6.2
There is main generation development planned for the period 2014 to 2018:
a) Salalah-2 (IPP)
The new Power Plant (IPP-2), which will commissioned in 2018. The total capacity will reach 400
MW.
Table 3 summarises the net capacity of the additional future generating plant over the period 2014 to 2018.
Table 3: New Contracted and Planned Generating Capacity
Net Generating Capacity (MW)
Power Station
Salalah-2 IPP Net Generation
2014
2015
2016
2017
2018
0
0
0
0
400
Table 5 summarises the Centrally Dispatched Net Generation Capacity available over the period 2013–
2018, with the new generation.
Table 4: Centrally Dispatched Generating Capacity on OETC Transmission System
Power Stations
2013
2014
2015
2016
2017
2018
Salalah IWPP
444
444
444
444
444
444
NPS
257
257
257
257
257
257
0
0
0
0
0
400
Total Generating Capacity (MW)
701
701
701
701
701
1101
Retirements
0
0
0
0
0
0
Salalah-2 IPP
6.3
Interconnections
6.3.1 Interconnection with PDO
The Dhofar transmission system is interconnected with the transmission system of the Petroleum
Development Oman (PDO) which provides electricity to its sites across the central region of Oman for the
purpose of oil exploration and development. The interconnection is made at 132kV between Thumrait grid
station on the Dhofar system and Harweel 132kV substation on the PDO 132kV network by 84.5 km
overhead line with a single Elm. Currently, the line is open and will be closed in the future and will be used
for emergency conditions and spinning reserve sharing.
Page | 23
6.4
Economic Dispatch
The Load Dispatch Centre of OETC dispatches generation based on its availability as stated by the
Generator on a day-ahead basis, and its price as listed by the Oman Power and Water Procurement Company
(OPWP). Under circumstances where the system frequency is seen to stray outside the specified limits,
LDC will issue dispatch instructions to Generators based on Merit Order to rectify the situation.
6.5
Spinning Reserve
The Load Dispatch Centre strives to maintain a spinning reserve equal to the rating of the largest generating
unit connected to the transmission system. In case of combined cycle power plant, the spinning reserve
equals the largest gas turbine unit plus its share in the steam turbine unit
Page | 24
7.
Demand Forecast and Generation Availability
7.1
System Demand
Maximum demand usually occurs on the OETC transmission system at Dhofar area on a weekday in the
months of May or June, during a period of particularly high temperature and humidity. The growth in air
conditioning equipment in domestic and commercial premises in Dhofar has ensured that peak demand
usually occurs during the early morning or afternoon. Figure 6 shows the 24-hour demand profile for the
OETC transmission system at Dhofar area on the day of the 2013 system peak demand (i.e. 28/05/2013).
The 2013 system peak demand of 421.7 MW was recorded at 00:34 hours. The historic growth in system
peak demand over the period (2003-2013) is shown in Table 5
Max Demand Profile
450.0
400.0
Load (MW)
350.0
300.0
250.0
200.0
150.0
100.0
50.0
0.0
Time (hrs)
Figure 6: Dhofar System Load on 2013 Peak Day
Page | 25
Table 5: Historic Growth in Peak Demand (2003 – 2013)
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
System Max Demand
(MW) based on gross
demand
178.3
180.8
199.3
232.3
253
260.4
283.8
337
348
389.3
421.7
Annual growth rate
based on gross
demand (%)
---
1.40
10.23
16.56
8.91
2.92
8.99
18.75
3.26
11.87
8.32
Minimum demand generally occurs on the transmission system during morning-time in December/January
when electricity consumption in all major load categories is reduced. In 2013 the system minimum demand
was 135.5 MW and this occurred on 18th of January 2013 at 07:07 hours. The 2013 system minimum
demand was about 32.1 % of the 2013 system peak demand. The 24-hour profile for the day of minimum
demand is shown in Figure 7.
Min Demand Profile
250.0
Load (MW)
200.0
150.0
100.0
50.0
0.0
Time (hrs)
Figure 7: Dhofar System Load on 2013 Minimum Load Day
Page | 26
7.2
Demand Forecast
Under clause 3 of Condition 27 of the OETC Transmission and Dispatch Licence it is stated that:
“The Licensee shall, when preparing the Capability Statement ….ensure that the forecasts of electricity
flows and loading on each part of the Transmission System are consistent with the prevailing electricity
demand forecasts prepared and used by the OPWP for the purposes of the Statement of future capacity
requirements required by Condition 5 of the OPWP licence”.
The OPWP demand forecast is based on data supplied to them by the DPC company and includes demand
forecasts for the major customers that are, or will be, directly connected to the OETC transmission system
at 132kV in their respective supply areas. DPC company forecast is provided in terms of:
a)
The growth in major industrial loads
b)
The growth in major tourism loads
c)
The annual domestic growth
d)
The growth in other major loads
The forecast data provided to OPWP does, however, include major future connections and the cumulative
increase in load over the seven-year period covered by the OPWP Statement. OPWP has then reviewed this
data and taken a view as to the probability that the individual schemes will proceed and if so, the rate at
which their load will develop. The outcome of this review is presented as the OPWP demand forecast in
its Seven-Year Statement.
The OPWP demand forecast was therefore taken as the starting point for developing the demand forecast
presented in this OETC System Capability Statement of Dhofar Area. The OETC forecast, however, is
required to identify the future demand at individual grid stations at the system peak for each year over the
period 2014 to 2018, since this information is required for the power flow studies.
Analysis of the demand forecast data used by OPWP in developing its Seven-Year Statement (2013-2019)
identified basic annual percentage rates of 8.2% for the growth in peak demand in the DPC company supply
area. These rates have been applied to the grid station demands in the respective supply area as noted by
the OETC at the 2013 system peak (i.e. 28/05/2013, 00:34 hour). The demand associated with major
industrial and tourism projects as assessed by OPWP (with diversity taken into account) was then
superimposed on to the steady growth in the basic demand to produce a basic forecast. Section 5 identified
a number of new grid supply points that are scheduled to come into service to meet the summer peak
demands from 2014 onwards. These gird stations will provide load relief to the more heavily loaded grid
stations and in some cases supply new loads.
DPC company’ plan for load transfers from existing grid stations that are heavily loaded to new grid stations
are one of the most important elements of the demand forecast. Table 6 summarises the load transfers
Page | 27
adopted in the studies based on consideration of what is required and what OETC has considered viable.
OETC, however, acknowledges that this aspect of the forecast needs to be improved in future and believes
that it would be helpful if DPC company were to give greater consideration to feasible load transfers when
planning their distribution networks, and to develop proposals for load transfers in coordination with OETC.
Also, the TSSS requirement shall be considered at every grid supply point and all new requirements shall
be indicated clearly.
Table 6: Expected Load Transfers between Grid Supply Points (2014-2018)
From Grid Station
Load Transfer (MW)
To Grid Station
2014
2015
2016
2017
2018
Dhofar Area
NPS (2x63MVA)
Awaqad (2X125MVA)
NPS (2x63MVA)
SFZ-B (2X125MVA)
SFZ-A (2X125MVA)
SFZ-B (2X125MVA)
Ittin (2X125MVA)
Awaqad (2X125MVA)
Ittin (2X125MVA)
A’Saada-A (2X125MVA)
Ittin (2X125MVA)
A’Saada-B (2X125MVA)
40
20
Al Qarm (2x63MVA)
Total (MW)
7.3
30
25
25
45
42
40
75.0
0.0
82.0
110.0
0.0
System Maximum Demand Forecast and Generation Availability
Table 7 shows the grid station demand forecast for the period 2014 – 2018 with prospective load transfers
taken into account and the forecast developed in accordance with the methodology described in sub-section
7.2.
Table 7: Dhofar Transmission System Demand Forecast by Grid Station
Grid Station
NPS (2x63MVA)
SFZ-A (2X125MVA)
SFZ-B (2X125MVA)
Awaqad (2X125MVA)
Ittin (2X125MVA)
Al Qarm (2x63MVA)
Ashoor (2X125MVA)
Thumrait (2X30MVA)
Salalah Airport
Total (MW)
Growth %
2013
Dhofar
78.7
64.0
0.0
0.0
155.0
0.0
0.0
70.0
39.0
15.0
0.0
421.7
-
Total Demand by Grid Station
2014
2015
2016
2017
2018
51.5
67.8
0.0
75.0
121.8
0.0
0.0
73.5
40.4
15.2
4.0
449.2
6.5%
33.5
56.4
52.0
86.1
65.1
67.1
62.3
45.2
46.3
16.1
8.0
538.1
3.6%
53.4
71.9
0.0
77.6
131.0
0.0
0.0
77.2
41.8
15.4
8.0
476.3
6.0%
55.3
76.2
0.0
80.3
99.0
82.0
0.0
41.0
43.2
15.6
8.0
500.6
5.1%
32.3
54.3
50.0
83.2
62.8
64.9
60.0
43.1
44.8
15.9
8.0
519.3
3.7%
Page | 28
Table 8 compares the total demand forecast with the available generating capacity from Table 5 including
planned retirements.
Table 8: Comparison of Demand Forecast with Available Generating Capacity including Planned
Retirements
Power Stations
2013
2014
2015
2016
2017
2018
NPS Power Plant
257
257
257
257
257
257
444
444
444
444
444
444
Salalah-2 IPP Power Plant
0
0
0
0
0
400
Total Generating Capacity (MW)
701
701
701
701
701
1101
Demand Forecast (MW)
421.7
449.2
476.3
500.6
519.3
538.1
Calculated Losses (MW)
3
3
3
2
2
2
Surplus/Deficit Capacity (MW)
(Generation-Demand-Losses)
276.3
249
222
198
180
561
Retirements
0
0
0
0
0
0
Page | 29
8.
Transmission System Performance
The transmission system data used in the power system studies to determine the system performance over
the period from 2014 to 2018 is presented in Appendix B of this document.
8.1
Power Flow and Voltage Profiles
The extreme cases of maximum and minimum system demand are used to define the performance of the
OETC transmission system when it is most heavily stressed. From the studies of these extreme conditions
it is possible to identify where the system is strong and has capacity to spare and, conversely, where it is
weak and will need strengthening before new connections could be considered. The peak demand case
identifies where there is a risk of overloading, of operation above firm capacity, or of system voltages
falling below the voltage limits as defined in the Grid Code.
The system data described and presented in Appendix B has been used in a series of load flow studies to
establish the performance of the OETC transmission system at peak demand in each year from 2014 to
2018 inclusive. The studies were undertaken on the basis that all circuits and plant will be available at
system peak in each of the five years and that the system will be developed in accordance with the plans
described in Section 5 of the Statement. The studies also assume that the demand will grow in accordance
with the demand forecast, which is consistent with that produced by the OPWP and distribution companies,
and that sufficient generation will be available from Contracted Generating Plants to meet each annual
system peak as indicated in the OPWP latest 7 Year Statement.
Table 9 shows the summary of the generating plants power assumed to be in service at peak load in each
year of the study from 2014 to 2018. Under peak load conditions it is assumed that capacitive support will
be switched on, i.e. capacitor banks at 33kV grid stations are properly adjusted to provide required reactive
power and voltage support. In the studies, generator terminal voltage and generator-transformer taps are
normally set at their corresponding nominal values, however, when necessary the settings are adjusted to
control the voltage on the transmission system to be within the allowable limits.
A second series of load flow studies were undertaken with the transmission system supplying minimum
demand. At the system minimum demand, the generation is reduced to a level that provides the necessary
margin of reserve capacity that is consistent with the operational practices adopted by Dhofar LDC to handle
minimum load conditions. Table 10 shows the generating plants assumed to be in service at minimum load
in each year of the study. The total generation was 172 MW on that time, which is about 34.61% of expected
generation at the maximum summer peak (497 MW). Under minimum load conditions it is assumed that
all capacitor banks are switched out to avoid overvoltage due to excessive capacitive reactive power.
Page | 30
Table 9: Summary of Connected Generation Used in Load Flow Studies of Maximum Demand
Power Stations
NPS
Salalah-1 IWP
Salalah-2 IPP
External Sources
Total Gen (MW)
Grid Load (MW)
Total
2014
Spare
257
444
75
129
182
315
257
444
64
111
193
333
257
444
56
96
201
348
257
444
49
85
208
359
−
0
−
0
−
0
−
0
−
0
−
0
−
0
−
0
−
0
−
0
−
0
−
0
257
444
400
0
701
204
449
497
701
176
476
526
701
152
501
549
701
134
519
567
1101
Gen Total
2015
Spare
Gen Total
2016
Spare
Gen Total
2017
Spare
Gen Total
2018
Spare
Gen
120
208
187
0
137
236
213
0
515
538
586
Table 10: Summary of Connected Generation Used in Load Flow Studies of Minimum Demand
Power Stations
NPS
Salalah-1 IWP
Salalah-2 IPP
External Sources
Total Gen (MW)
Grid Load (MW)
Total
257
444
−
0
701
2014
Spare
198
331
−
0
529
147
Gen
Total
59
113
−
0
172
257
444
−
0
701
2015
Spare
194
322
−
0
516
159
Gen
Total
63
122
−
0
185
257
444
−
0
701
2016
Spare
183
326
−
0
509
167
Gen
Total
74
118
−
0
192
257
444
−
0
701
2017
Spare
181
323
−
0
503
173
Gen
Total
76
121
−
0
198
257
444
0
0
701
2018
Spare
215
283
0
0
498
179
Gen
42
161
0
0
203
Page | 31
The key results of the load flow and fault level studies on the OETC transmission system are presented in
detail in Appendix C for each year over the period 2014 to 2018. System diagrams are showing the results
of the peak demand. Load flows have also been produced and are available in Appendix C.
The results include the following:

Table C.1 shows the transformer percentage loading of all grid stations at system peak demand.

Table C.2 shows the available spare capacity at each grid station in relation to firm capacity at system
peak demand. It should be noted that although spare MVA capacities are available at some individual
grid stations, there is no guarantee that all can be exploited simultaneously. Lack of available generation
and/or voltage level limits may restrict simultaneous utilization of all spare MVA capacities.

Table C.3 shows the percentage loading of each overhead line and underground cable in the
transmission system at system peak demand.

Tables C.4 (a) and C.4 (b) show the voltage profile at each 132kV and 33kV bus-bar at maximum and
minimum load respectively.

Table C.5 shows the calculated transmission losses at peak demand.

Tables C.6 and C.7 show the maximum three-phase and single-phase to earth short-circuit fault levels
respectively.
The principal findings from the power system studies are:
Grid Stations Firm Capacities
a) Some of the 132/33kV grid stations show some constraints in 2014 and 2015. For example, at the
summer peak in 2014 and 2015, two out of seven grid stations will operate above their firm capacity.
At summer peak in 2015, two out of seven grid stations will operate above their firm capacity. During
2016 to 2018, a number of 132/33kV grid stations will be upgraded and new ones are introduced to
remove none-firm conditions at some locations. In the period 2016 to 2018 all 132/33kV grid stations
will be operating within their firm capacity.
b) The number of out-of-firm grid stations during the period 2014 to 2018 are:
 2014 – 2
 2015 – 2
 2016 – 0
 2017 – 0
 2018 – 0
This is shown graphically in Figure 8.
Page | 32
No. of Out-of-Firm Grid Stations VS Year
2
1.5
1
0.5
0
2014
2015
2016
2017
2018
Figure 8: Number of out-of-firm grid stations during 2014-2018.
c) All 132kV overhead lines are within their corresponding firm capacity over the period 2014-2018
d) Implementation of the development projects described in Section 5 and the modest load transfer
programme of Table 6 will restore the full system to compliance with Transmission System Security
Standard requirements.
Voltage Issues
e) The voltage at the 132kV busbars will be maintained within the ±10 % voltage limit at the extremes of
maximum and minimum demand during years 2014-2018.
f) The 33kV busbar voltages at all grid stations will be maintained within ±6 % of nominal voltage during
these extreme load conditions of maximum and minimum demand, i.e. all 33kV busbars will be within
the acceptable operating range specified in the Grid Code. In fact, the voltage at 33kV busbars is well
regulated to be within around 1.0 p.u. in all cases by exploiting the automatic on-load tap-changer of
the 132/33kV transformers and the capacitor banks regulators.
g) Figures 9,10 and 11 show samples of voltage profiles at SFZ, Ittin and Al Qarm grid stations. These
grid stations have two voltage levels: 132kV and 33kV. Although the voltage at 132kV busbars can
change within the allowable range (depending on the load), the voltage at the grid supply points is well
regulated at almost 33kV level (1.0 p.u.).
Page | 33
1.20
132kV Busbar
1.10
1.00
0.90
0.80
0.70
0.60
V (Max Load)
0.50
V (Min Load)
0.40
0.30
0.20
0.10
0.00
2014
2015
1.20
2016
2017
2018
33kV Busbar
1.10
1.00
0.90
0.80
0.70
0.60
V (Max Load)
0.50
V (Min Load)
0.40
0.30
0.20
0.10
0.00
2014
2015
2016
2017
2018
Figure 9: Voltage profile (p.u.) at SFZ Grid Station.
Page | 34
1.20
132kV Busbar
1.10
1.00
0.90
0.80
0.70
0.60
V (Max Load)
0.50
V (Min Load)
0.40
0.30
0.20
0.10
0.00
2014
2015
1.20
2016
2017
2018
33kV Busbar
1.10
1.00
0.90
0.80
0.70
0.60
V (Max Load)
0.50
V (Min Load)
0.40
0.30
0.20
0.10
0.00
2014
2015
2016
2017
2018
Figure 10: Voltage profile (p.u.) at Ittin Grid Station.
Page | 35
1.20
132kV Busbar
1.10
1.00
0.90
0.80
0.70
0.60
V (max Load)
0.50
V (Min Load)
0.40
0.30
0.20
0.10
0.00
2014
1.20
2015
2016
2017
2018
33kV Busbar
1.10
1.00
0.90
0.80
0.70
V (Max Load)
0.60
V (Min Load)
0.50
0.40
0.30
0.20
0.10
0.00
2014
2015
2016
2017
2018
Figure 11: Voltage profile (p.u.) at Al Qarm Grid Station.
Page | 36
Transmission Losses
a) The calculated active power loss on the transmission system at peak demand over the period 2014
to 2018 ranges between 1.57% and 3.17% of respective total generation as shown in Table C.5
and Figure 12. The average power loss is about 2.46%, which is still within international norms.
% of Power Loss VS Years
3.2
3
2.8
2.6
2.4
2.2
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
2014
2015
2016
2017
2018
Figure 12: Transmission power losses at peak demand of the years 2014-2018.
Load Growth
a) The high growth rate of the existing load coupled with major new industrial developments in
many areas and major tourism projects around the coast of Dhofar presents a major challenge to
OETC in providing the capacity needed to satisfy demand over the next five years. Table C.5
shows that the expected peak load increases from 449 MW in 2014 to 584 MW in 2018; which
amounts to an increase of about 19.8% during the study period.
Figure 13 shows the expected peak load growth from 2014 to 2018. This peak load includes grid,
industrial, auxiliary and desalination loads, but excludes transmission losses.
Page | 37
Peak Load Growth (MW) VS Years
540
520
500
480
460
440
420
400
2014
2015
2016
2017
2018
Figure 13: Peak load growth over the period 2014-2018.
h) The load flow studies show that the planned 132kV transmission developments will add
substantial new capacity to the transmission system that will enable the transmission system as a
whole to cope with new demand in compliance with the Transmission Security Standard.
Consequently opportunities for the connection of new load should be available where spare
capacity exists.
8.2
Fault levels
a)- Three-Phase Short Circuit Studies
The maximum 3-Phase and Single-Phase short-circuit fault levels have been determined in accordance with
IEC 60909 and as such the calculation excludes the contribution to fault level from sources at lower
voltages, e.g. from induction motors connected at 11 kV or below. The method is valid and consistent with
that followed by other transmission companies in the absence of data from the distribution companies for
short-circuit back-feeds to the grid station 33kV busbars. Table C.6 summarises the results of the 3-phase
fault studies over the period 2014-2018:

All the 132kV buses have fault levels within the corresponding switchgear ratings.

The 3-phase short-circuit level at all 33kV busbars does not exceed the switchgear rating.
Page | 38
b)- Single-Phase Short Circuit Studies
Table C.7 summarises the results of maximum single-phase short circuit studies for years 2014 to 2018. In
the years 2014 to 2018 the fault levels across the transmission system are within the corresponding
switchgear short-circuit ratings.
Page | 39
9.
Development Opportunities
From the results of the load flow and fault level studies, and from analysis of the magnitude and location
of generation and demand on the transmission system at Dhofar area it is possible to give some indication
as to where future generation and demand can be connected to the transmission system without causing or
exacerbating any critical technical issues.
9.1
Review of the generation versus load balance at Dhofar Area
The performance of the transmission system at Dhofar area is affected by the transfer of power, both real
and reactive, from one region to another. Large power transfers between regions over long distances
increase the voltage drop across the transmission system. They also increase the power losses and reduce
the efficiency of the system. Ideally if the balance between generation and demand is maintained on a
regional or area basis then power transfers over long distances can be minimised, thus leading to
improvement of the transmission system efficiency and voltage regulation.
Figure 14 shows the connectivity of the OETC transmission system at Dhofar area in 2018 as it extends
over the northern regions of Dhofar, a distance of around 67 km from NPS grid station in the North West
to Ashoor grid station in the south-west.
Table 11 compares the generation capacity installed in Dhofar area with the forecast demand at the grid
stations at the annual system peak over the period 2014 to 2018.
The transmission system in the Dhofar area provides the interconnection with the PDO (Putrolium
Devlopment of Oman) and supplies a number of grid stations that feed DPC Distribution System to supply
Salalah city, a number of towns and villages in Dhofar area. Currently, there are two power plants in Dhofar
area; NPS Power Plant (257MW) and Salalah IWPP Power Plant (444MW). As shown in table 11, the load
in Dhofar area rises from 449.2MW in 2014 to 538.1MW in 2018. In 2014 the generation surplus is 252MW
decreasing to 225MW, 200MW and 182MW in 2015, 2016 and 2017 respectively. In 2018 Salalah IWPP2 will be in service and the generation surplus is 563MW.
Page | 40
Figure 14: Future Dhofar Transmission System (2018)
Page | 41
Table 11: Estimated Power Surplus and Power Deficit at Dhofar area (2014-2018)
Area
2014
2015
2016
2017
2018
NPS Power Plant
257
257
257
257
257
444
444
444
444
444
0
0
0
0
400
Total Generation (MW)
701
701
701
701
1101
NPS (2x63MVA)
51.5
53.4
55.3
32.3
33.5
SFZ-A (2X125MVA)
67.8
71.9
76.2
54.3
56.4
SFZ-B (2X125MVA)
0
0
0
50
52
Awaqad (2X125MVA)
75
77.6
80.3
83.2
86.1
121.8
131
99
62.8
65.1
0
0
82
64.9
67.1
0
0
0
60
62.3
Al Qarm (2x63MVA)
73.5
77.2
41
43.1
45.2
Ashoor (2X125MVA)
40.4
41.8
43.2
44.8
46.3
Thumrait (2X30MVA)
15.2
15.4
15.6
15.9
16.1
4
8
8
8
8
Total Load (MW)
449.2
476.3
500.6
519.3
538.1
Power Surplus/Deficit (MW)
252
225
200
182
563
Salalah IWPP-2 Power Plant
Dhofar
Grid Station loads at System Peak Demand
Grid & Power Stations
Ittin (2X125MVA)
Salalah Airport
Page | 42
Figure 15 show graphically the generation and load in Dhofar area. The significant differences in
generation and load imbalance in Dhofar area necessitate some development and investment in the
transmission system to facilitate power transfer among the Dhofar area in order to supply the growing loads.
Dhofar Area
1200
1000
Power (MW)
800
Total Generation (MW)
600
Total Load (MW)
400
200
0
2014
2015
2016
2017
2018
Figure 15: Generation and load balance in Dhofar area.
Page | 43
9.2
Available grid station capacity
Table C.2 in Appendix C identifies the available capacity at grid stations for the connection of new demand
over the period 2014 to 2018. Table 12 lists the grid stations where spare grid transformer capacity of more
than 10 MVA is available to supply new demand, on the same area basis as that presented in sub-section
9.1. The MVA figure quoted refers to the available capacity in 2018. The available capacity was determined
in relation to the firm capacity of the substation. Figures (16) show graphical representation of available
capacities.
Table 12: Available Grid Station Capacity of More than 10 MVA in 2018
Region
Grid Station Name
Dhofar
NPS (2x63MVA)
SFZ-A (2X125MVA)
SFZ-B (2X125MVA)
Awaqad (2X125MVA)
Ittin (2X125MVA)
Al Qarm (2x63MVA)
Ashoor (2X125MVA)
Thumrait (2X30MVA)
Available Capacity (MVA)
27.74
65.63
70.26
34.37
56.47
54.37
59.42
15.42
76.26
13.05
125
S(MVA)
100
75
50
Available MVA
25
Used MVA
0
Grid Station
Figure 16: Used and available MVA in Dhofar area at 2018 peak demand.
Page | 44
10.
Derogation
The load flow studies summarised in Appendix C and discussed in Sections 8 and 9 of this Statement
indicate a number of out-of firm grid stations in the early years of the Statement. In this final section, we
review each grid station, which is currently failing to meet the Transmission System Security Standards;
we describe the development activities that OETC is undertaking or planning to undertake to address this
non-compliance; and we indicate the expected time by which, in each instance, full Transmission Security
Standards compliance should be achieved.
It should be noted that the Transmission System Security Standard on the transmission system would
change in future as demand on the system increases and as the system configuration changes. It is possible
that further non-compliances might arise in the future until the overall system becomes substantially more
robust through interconnection. OETC will keep this situation under review, and the non-compliance status
will be updated in the 2015 Capability Statement.
As indicated in sections 8, 9 and summarized in tables 13 (A &B), there are some grid stations, which do
not comply with the Transmission System Security Standard. Therefore, it will be necessary for a further
location and duration specific derogations to be put in place by the Authority for each of the stations which
do not comply with the Transmission Security Standard at peak and maintenance time noted in table 13 (A)
and 13 (B) respectively.
The following points should be noted:
1- The loading values show in tables C1 and C3 (Appendix C), are those at the peak load conditions. The
system peak lasts only for a period of less than one hour in one day during the relevant year. (For
example, refer to Figure 6 of 2013 daily load curve peak day).
2- According to the most recent OPWP data, there are two forecast cases: (i) expected case, and (ii) high
case. The difference between the high and expected case in 2014 is 21 MW at the peak. This difference
increases in the subsequent years and reaches 68 MW in 2018, indicating uncertainty in the forecast over
the coming years especially with regards to new industrial loads. OETC supports OPWP’s view that the
likelihood of the high case demands being realized is heavily dependent on the rate of recovery of the
current global economic and financial conditions. OETC intends to monitor closely, in coordination
with OPWP, the situation in order to assess the probability associated with the high case projection.
3- It is not prudent to invest in uncertain expansion. OETC will, of course, initiate new projects as new
demand becomes more certain. Therefore, in Table 13 we concentrate on covering the conditions at the
peak in 2014.
4- The modelling reflects all load transfer schemes that have been formally accepted by the relevant DPC
company and included in their load forecast. In addition, the modelling includes certain load transfer
schemes, which are not yet confirmed by the DPC company concerned, but which in the view of OETC
are technically feasible and where no technical impediment to implementation exists.
OETC has adopted a three-fold approach to addressing these out of firm situations:
Page | 45
1) Reinforcement plans: strategic upgrading to add new circuits and/or to increase the capacity of grid
stations within a minimum of two to five years. This will not just solve the problem; but it will also
strengthen the transmission system for future development. This type of solution can only be
applied as a longer-term solution because of the time taken to implement. Reinforcement is the
most robust long-term solution for secure system development, but may not necessarily be the least
cost solution to address the immediate out of firm conditions on the network.
2) Installing third and forth transformers at heavily loaded grid stations, such as SFZ and A’Saada
grid stations. These will provide a permanent solution to the out-of-firm problems at the heavily
loaded grid stations.
3) Load Transfer: through agreement with DPC company, load can be transferred from heavily loaded
grid stations to more lightly loaded grid stations over the next three years. This would reduce the
loading issues and balance the system during peak time. This is a mid-term solution which could
be implemented with the cooperation of DPC company in certain cases. Given the uncertainty of
mid-term load forecasts in Dhofar at present, this is in some circumstances the most appropriate
and economic action to address out of firm conditions on the network.
Table 13 (A) indicate a number of locations on the system where, at present, the out of firm condition of
certain transformers is shown to exist. Table 13 (B) shows the grid stations which are classified as group
E (>100 MW) as per the Transmission Security Standard. Some of them will not comply with Transmission
System Security Standard (Second Outage) at 2014 maintenance period.
Page | 46
Table 13 (A): Expected Grid stations 132/33kV which will not comply with Transmission Security Standard (First Outage) at Peak Demand in 2014
No
Location
Total
Transformer
Capacity
(MVA)
Substation
Firm
Capacity
(MVA)
Loading
Indicative Date for full
Compliance with the
Transmission Security
Standard
Remarks
(%)
1
Al Qarm
2 x 63
63
66.86
Q1 2016
Load transfer to Awqad and A’Saada-A grid stations.
2
Ittin
2 x 125
125
53.25
Q1 2016
Load transfer to A’Saada-A grid station.
Table 13 (B): Expected Grid stations 132/33kV which will not comply with Transmission System Security Standard (Second Outage) at Maintenance
Period in 2014.
NO
1
Grid Station
Name
Ittin
Tx capacity
(MVA)
125
No of
Txs
2
Demand
Forecast
Transformer
Loading
(MW)
(%)
Dhofar
121.8
53.25
Peak
Demand
Forecast
During
Maintenance
Transferable
Load in case of
Second Outage
During
Maintenance
Transmission Security
Standard Compliant
(MVA)
(MVA)
During Second Outage
88.75
0
No
Page | 47
Appendix A: Review of Future Developments
A.1 Summary of Projects to be completed between 2014-2018 Peak Demand
The OETC transmission network at Dhofar area is undergoing widespread and rapid development due to
the expansion requirements of DPC company, large private customers, and new generation requirements
based on the yearly demand growth and further reinforcements on the transmission network to ensure the
security, quality and reliability of the system.
There are a significant number of projects required to meet the annual peak demands over the period of this
Statement (2014-2018). These projects are considered below under the following categories:

Projects of 2014 peak demand.

Projects that are at design stage.

Projects that are at the tender evaluation stage prior to appointment of the preferred
EPC Contractor.

Projects for future developments that represent the least cost options to address
problems with system growth, voltage profile, non-complince with the Transmission
Security Standard by transmission system reinforcement.
The entire programme of ongoing and future projects which are planned for implementation over the period
2014 to 2018 are listed and described below. It should be noted that the project numbers referred in this
Appendix are identical to those in Table 1 of the Executive Summary, and it should also be noted that not
all of the projects described have full authorisation at this time and to be supported by pre investment
appraisals document to approve and to select the proper option for each project.
Project #1:
New Grid Station at Awqad (2x125MVA)
The objective of this project is to construct a new 132/33kV, 2 x 125MVA transformers at Awqad which
will be supplied from SFZ grid station through 19km double circuits OHL. This grid station will release
load from NPS grid station and can be used to transfer load from Ittin grid station. The location of this grid
station was selected by DPC Company. This project expected to be completed by Q1 2014.
Project #2:
New 132kV Line (A’Saada-Ashoor)
The objective of this project is to construct a new 132kV line in order to fed new A’Saada grid station from
Ashoor grid station through 35km double circuits OHL. This project is under construction and expected to
be completed by Q2 2016.
Page | 48
Project #3:
New grid station at A’Saada (2x125MVA)
The objective of this project is to construct a new 132/33kV, 2 x 125MVA transformers at A’Saada which
will be supplied from Ashoor grid station through 35km double circuits OHL. This grid station will release
load from Ittin grid station and can be used to transfer load from Al Qarm grid station. The location of this
grid station was selected in coordination with DPC Company. This project expected to be completed by Q2
2016.
Project #4:
New 132kV Line (A’Saada-Awqad)
The objective of this project is to construct a new 132kV line connected from A’Saada to Awqad grid
stations through 20km double circuits OHL in order to close the loop of 132kV system and for maintaining
the Transmission Security Standard requirements. This project is under design and expected to be
completed by Q2 2017.
Project #5:
Adding Third & Forth Txs to SFZ (2x125MVA)
The objective of this project is to adding 2 x 125MVA transformers at existing SFZ grid station. This new
capacity at SFZ GS will release load from the existing transformers (SFZ-A grid station) and can be used
to transfer load from NPS grid station. The location of this grid station was selected in coordination with
DPC Company. This project expected to be completed by Q2 2017.
Project #6: Connection of Salalah-2 IPP
This project is implemented to support the power evacuation from Salalah-2 IPP power plant (400MW) and
for maintaining the Transmission Security Standard requirements. The construction of this project consists
of 10x132kV GIS at SFZ grid station in order to connect to Salalah-2 IPP. This project is expected to be in
service by Q2 2017.
Project #7: Adding Third & Forth Txs to A’Saada (2x125MVA)
The objective of this project is to adding 2 x 125MVA transformers at A’Saada grid station. This new
capacity at A’Saada GS will release load from A’Saada-A grid station and can be used to transfer load from
Al Qarm grid station. The location of this grid station was selected in coordination with DPC Company.
This project expected to be completed by Q2 2017.
Page | 49
Appendix B: Transmission System Data
B.1 Substations Loads and Capacitor data
The grid station real and reactive power load at system peak demand for the period 2014 to 2018 and the
respective reactive power support from capacitor banks connected at the grid station 33kV busbars is shown
in Table B.1.1 This data was used in the power flow studies of system peak demand presented in Section 8
of this Capability Statement.
B.2 Overhead Line Circuit Capacities and Parameters
The continuous thermal rating of a circuit is the maximum power flow that can be carried by that circuit on
a continuous basis. The thermal rating of an overhead line is the power flow that can be carried by that line
without infringing the statutory clearances and causing a risk to public safety and to the line itself. The
thermal rating of an underground cable, however, is the maximum power flow that the cable can carry
without either causing the cable to fail or to effectively reduce its projected lifespan through a deterioration
of the cable insulation.
Although the thermal rating of an overhead line is affected by climatic conditions, for the purpose of
assessing spare capacity on the transmission system the key climatic condition that limits the circuit rating
is the summer rating when the temperature is at its highest and the solar radiation is at its peak. This also
corresponds to when the electricity demand is at or near to its peak.
The circuit data presented in Table B.2 for the first year of the Statement period (2014) comprises the
voltage, resistance, reactance, susceptance and thermal rating of the line and cable circuits. It also shows
the circuit length and the type of overhead conductor or underground cable for each circuit.
Table B.3 shows the changes to the circuit data required in each of the other four years covered by the
Statement.
B.3 Transformer data
The data used to model the grid supply point transformers in the power flow studies of the 2014 summer
peak demand condition is listed in Table B.4. The data comprises the transformer voltage ratio, the
resistance and reactance, the tap range and step size. Table B.5 lists changes to the transformer data for the
remaining four years of the Statement.
1
The 33kV busbars at the grid supply points and the capacitors connected to them are owned and operated by the distribution companies.
Page | 50
Table B.1: Load and Capacitor Data for Grid Stations (2014-2018)
2014
2015
2016
2017
2018
Grid Stations
P Load
(MW)
Q Load
(MVAr)
Caps
(MVAr)
P Load
(MW)
Q Load
(MVAr)
Caps
(MVAr)
P Load
(MW)
Q Load
(MVAr)
Caps
(MVAr)
P Load
(MW)
Q Load
(MVAr)
Caps
(MVAr)
P Load
(MW)
Q Load
(MVAr)
Caps
(MVAr)
NPS
58.2
−
−
57.2
−
−
53.2
−
−
51.3
−
−
54.6
−
−
IPP-2
0.0
−
−
0.0
−
−
10.8
−
−
12.8
−
−
20.2
−
−
SFZ
80.9
−
−
88.0
−
−
99.0
−
−
101.9
−
−
105.9
−
−
Awaqad
71.0
−
−
92.8
−
−
106.8
−
−
127.0
−
−
136.1
−
−
Ittin
110.6
20
20
131.6
20
20
104.9
20
20
110.7
20
20
116.4
20
20
A’Saada
0.0
−
−
0.0
−
−
79.1
−
−
83.5
−
−
89.9
−
−
Al Qarm
73.9
−
−
64.7
−
−
38.2
−
−
45.5
−
−
51.2
−
−
Ashoor
35.3
−
−
40.3
−
−
46.9
−
−
49.6
−
−
54.3
−
−
Thumrait
17.3
−
−
19.5
−
−
20.7
−
−
22.0
−
−
23.4
−
−
GRAND TOTAL
447.2
0.0
0.0
494.1
0.0
0.0
559.6
0.0
0.0
604.2
0.0
0.0
652.1
0.0
0.0
Page | 51
Table B.2: 2014 Branch Data Listing
From
Substation
To
Substation
Voltage
(kV)
No.
Circuits
Conductor
Type (OHL)
Length
(Km)
R[Ω/km]
X[Ω/km]
SFZ
Rating
(MVA)
Conductor
Type (Cable)
Length
(Km)
R[Ω/km]
X[Ω/km]
B[MS/km]
Rating
(MVA)
Ittin
132
2
AAAC "YEW"
25.877
0.042
0.288
359
2500mmsq.
0.1
0.01075
0.141
91.1
279
Ittin
Al-Qarm
132
2
AAAC "YEW"
22.4
0.042
0.288
359
−
−
−
−
−
−
Ittin
Thumrait
132
2
AAAC "ELM"
61.198
0.09
0.3
183
−
−
−
−
−
−
NPS
SFZ
132
2
AAAC "YEW"
0.5
0.042
0.288
359
2500mmsq.
0.1
0.01075
0.141
91.1
279
Ashoor
Al-Qarm
132
2
AAAC "YEW"
24.5
0.042
0.288
359
2500mmsq.
2.635
0.01075
0.141
91.1
279
Awaqad
SFZ
132
2
AAAC "YEW"
19
0.042
0.288
359
−
−
−
−
−
−
B[MS/km]
Table B.3: Progressive Changes to Branch Circuit Data for 2015-2018
2016 Additions
From
Substation
A’Saada
To
Substation
Ashoor
Voltage
(kV)
No.
Circuits
Conductor
Type (OHL)
Length
(Km)
R[Ω/km]
X[Ω/km]
132
2
AAAC "YEW"
35
0.042
0.288
Voltage
(kV)
No.
Circuits
Conductor
Type (OHL)
Length
(Km)
R[Ω/km]
X[Ω/km]
132
2
AAAC "YEW"
20
0.042
0.288
B[MS/km]
Rating
(MVA)
Conductor
Type
(Cable)
Length
(Km)
R[Ω/km]
X[Ω/km]
B[MS/km]
Rating
(MVA)
359
−
−
−
−
−
−
Rating
(MVA)
Conductor
Type
(Cable)
Length
(Km)
R[Ω/km]
X[Ω/km]
B[MS/km]
Rating
(MVA)
359
−
−
−
−
−
−
2017 Additions
From
Substation
Awaqad
To
Substation
A’Saada
B[MS/km]
Page | 52
Table B.4: Grid Stations Transformer Data at 2014 peak
Peak 2014
Rating
Substation
Voltage
Vector
Tap
Tap Step
Neutral
Min
Max
(MVA)
(kV)
Group
63
132/33
YNd0
2
63
132/33
1
125
132/33
2
125
1
2
Off-Nominal Tap range
Reactance
Side
(%)
Tap
Tap
Tap
Upper (pu)
Lower (pu)
(% on rating)
HV
1.11
10
1
19
5.55
-15.54
14.5
YNd0
HV
1.11
10
1
19
5.55
-15.54
14.5
YNd5
HV
1.11
5
1
19
5.55
-15.54
16.47
132/33
YNd5
HV
1.11
5
1
19
5.55
-15.54
16.47
125
132/33
YNd5
HV
1.11
5
1
19
5.55
-15.54
16.47
125
132/33
YNd5
HV
1.11
5
1
19
5.55
-15.54
16.47
1
125
132/33
YNd5
HV
1.67
10
1
19
5
-15
17.72
2
125
132/33
YNd5
HV
1.67
10
1
19
5
-15
17.72
1
63
132/33
YNd0
HV
1.11
10
1
19
5.55
-15.54
14.5
2
63
132/33
YNd0
HV
1.11
10
1
19
5.55
-15.54
14.5
1
30
132/33
YNd5
HV
1.11
6
1
20
5.55
-14.43
10.91
2
30
132/33
YNd5
HV
1.11
6
1
20
5.55
-14.43
10.91
1
125
132/33
YNd5
HV
1.11
5
1
19
5.55
-15.54
16.47
2
125
132/33
YNd5
HV
1.11
5
1
19
5.55
-15.54
16.47
Tx. No
1
NPS
Ashoor
SFZ
Ittin
Al Qarm
Thumrait
Awaqad
Table B.5: Grid Stations Transformer Data from 2016 to 2017
2016 Changes
Substation
Rating
Voltage
Vector
Tap
Tap Step
Neutral
Min
Max
Reactance
(MVA)
(kV)
Group
Side
(%)
Tap
Tap
Tap
Upper (pu)
Lower (pu)
(% on rating)
1
125
132/33
YNd5
HV
1.25
5
1
17
5
-15
18.7
2
125
132/33
YNd5
HV
1.25
5
1
17
5
-15
18.7
Rating
Voltage
Vector
Tap
Tap Step
Neutral
Min
Max
(MVA)
(kV)
Group
Side
(%)
Tap
Tap
Tap
Upper (pu)
Lower (pu)
(% on rating)
1
125
132/33
YNd5
HV
1.25
5
1
17
5
-15
18.7
2
125
132/33
YNd5
HV
1.25
5
1
17
5
-15
18.7
1
125
132/33
YNd5
HV
1.11
6
1
20
5.5
-15.54
17.42
2
125
132/33
YNd5
HV
1.11
6
1
20
5.5
-15.54
17.46
Tx. No
Additions
A’Saada
2017 Changes
Substation
Reactance
Tx. No
Additions
A’Saada-B
SFZ-B
Page | 53
Appendix C: Power System Studies
C.1 Summary of Load Flow Study results
The expected performance of the system at peak and minimum demand for each year from 2014 to 2018
are summarised in a series of tables and presented pictorially.
The study results are presented in the following tables:
Table C.1 – Grid transformer loadings at Peak Demand (2014-2018)
Table C.2 – Available capacity at Grid Stations (2014-2018) for connection of new demand
Table C.3 – Overhead line and cable circuit loadings at peak demand (2014-2018)
Table C.4 (a) – Transmission system voltage profile at peak demand (2014-2018)
Table C.4 (b) – Transmission system voltage profile at minimum demand (2014-2018)
Table C.5 – Estimation of transmission losses and generation margin at peak demand (2014-2018)
C.2 Summary of Fault Level Study results
The expected maximum busbar 3-phase and single phase fault levels are presented in tabular form as
follows:
Table C.6 – Maximum 3-Phase Short Circuit Fault Levels (2014-2018)
Table C.7 – Maximum Single-Phase Short Circuit Fault Levels (2014-2018).
C.3 Diagrames of the model for the Load Flow Study Results
The result of peak demand load flow studies for the years 2014 through to 2018 are presented as Figures
C.1 to C.5 respectively.
Page | 54
Table C.1: Transformer Loading (%) at Grid Station (2014-2018)
Location
Total Transformer
Capacity (MVA)
Substation
Firm Capacity
(MVA)
Transformer loading (%)
2014
2015
2016
2017
2018
132/33 kV Transformers
Al Qarm
2 x 63
63
66.86
66.48
37.32
39.32
41.27
Ashoor
2 x 125
125
18.44
18.22
19.88
20.69
21.40
SFZ-A
2 x 125
125
30.90
34.75
34.79
24.92
25.85
SFZ-B
2 x 125
125
22.65
23.52
Ittin
2 x 125
125
53.25
57.08
43.09
27.06
28.05
NPS
2 x 63
63
31.83
34.20
34.45
14.40
18.14
A’Saada-A
2 x 125
125
37.50
29.64
30.65
A’Saada-B
2 x 125
125
27.65
28.72
Awaqad
2 x 125
125
34.45
33.87
36.93
38.10
39.43
Thumrait
2 x 30
30
28.95
29.67
29.67
30.23
30.58
Table C.2: Available Capacity at Grid Stations (2014-2018) for Connection of New Demand
Location
Al Qarm
Ashoor
SFZ-A
SFZ-B
Ittin
NPS
A’Saada-A
A’Saada-B
Awaqad
Thumrait
Total
Transformer
Capacity
(MVA)
Substation
Firm
Capacity
(MVA)
132/33 kV Transformers
2 x 63
63
2 x 125
125
2 x 125
125
2 x 125
125
2 x 125
125
2 x 63
63
2 x 125
125
2 x 125
125
2 x 125
125
2 x 30
30
Available Capacity (MVA)
2014
2015
2016
2017
2018
-21.24
78.90
47.75
-20.76
79.45
38.13
15.98
75.30
38.03
82.40
22.89
79.34
19.91
90.53
19.59
31.25
38.88
12.63
40.33
12.20
32.68
12.20
13.46
73.28
62.70
68.38
103.35
44.86
50.90
55.88
29.75
11.86
11.00
71.50
60.38
66.20
102.56
40.14
48.38
53.20
26.43
11.65
Page | 55
Table C.3: Overhead Line and Cable Circuit Loading (%) at Peak Demand (2014-2018)
Send Bus
Receive Bus
Voltage
(kV)
No. of
circuits
Circuit Loading at Max Demand (%)
Circuit
Rating
(MVA)
2014
2015
2016
2017
2018
SFZ
Ittin
132
2
784
7.41
3.60
6.75
3.16
12.95
Ittin
Thumrait
132
2
398
4.45
4.79
4.56
4.65
4.70
Ittin
Al-Qarm
132
2
784
22.31
23.96
19.54
11.19
2.61
Al-Qarm
Ashoor
132
2
784
42.16
44.52
32.37
21.95
11.39
Ashoor
A’Saada
132
2
398
12.39
21.48
13.78
NPS
SFZ
132
2
784
27.70
25.86
30.25
36.14
31.59
SFZ
Awqad
Awqad
A’Saada
132
2
784
11.26
10.85
12.07
11.30
18.71
132
2
784
5.75
Table C.4 (a): Transmission System Voltage Profile at Peak Demand (2014-2018)
Location
Al Qarm
Ashoor
Ittin
NPS
A’Saada
Sahah'Aon (Awaqad)
SFZ
Thumrait
Al Qarm
Ashoor
Awqad
Ittin
NPS
A’Saada -A
A’Saada-B
SFZ-A
SFZ-B
Thumrait
Busbar Voltage at Minimum Demand (per unit)
2014
2015
2016
2017
132 kV Busbars
1.00
1.00
1.00
1.00
1.02
1.01
1.01
1.01
1.00
1.00
1.00
1.00
1.01
1.00
1.01
1.01
1.00
0.99
1.00
1.00
1.00
1.00
1.01
1.00
1.01
1.01
1.00
1.00
1.00
1.00
33 kV busbars
1.00
1.01
1.00
1.00
1.01
1.00
1.00
0.99
1.00
1.00
1.00
1.00
1.01
1.01
1.01
1.01
1.00
1.00
1.01
1.01
1.00
1.01
1.01
1.01
1.00
1.01
1.00
1.01
1.01
1.01
1.01
1.01
2018
1.00
1.01
1.00
1.01
0.99
1.00
1.01
1.00
1.00
1.00
1.00
1.01
1.01
1.01
1.01
1.00
1.01
1.01
Page | 56
Table C.4 (b): Transmission System Voltage Profile at Minimum Demand (2014-2018)
Busbar Voltage at Minimum Demand (per unit)
Location
2014
2015
2016
2017
132 kV Busbars
Al Qarm
1.00
1.00
0.99
1.00
Ashoor
1.00
1.00
1.00
1.00
Ittin
1.00
1.00
0.99
1.00
NPS
1.00
1.00
1.00
1.00
A’Saada
0.99
Awaqad
1.00
1.00
1.00
SFZ
1.00
1.01
1.00
1.00
Thumrait
1.00
1.00
0.99
1.00
33 kV busbars
Al Qarm
1.00
1.00
0.99
1.00
Ashoor
1.00
1.00
0.99
1.00
Awqad
1.00
1.01
0.99
Ittin
1.01
1.01
1.01
1.01
NPS
0.99
1.01
1.01
1.00
A’Saada -A
1.00
A’Saada-B
SFZ-A
1.00
1.00
0.99
0.99
SFZ-B
Thumrait
0.99
0.99
1.00
1.00
2018
1.00
1.00
0.99
1.00
0.99
0.99
1.00
0.99
1.00
1.00
1.00
1.00
1.01
1.00
1.00
0.99
1.00
1.00
Page | 57
Table C.5: Estimation of Transmission Losses and Generation Margin at Peak Demand (2014-2018)
2014
2015
MW Mvar MW Mvar
Transmission Losses
492
211
519
118
Generation
0
0
0
0
External Infeed
492
211
519
118
Total Generation
489
161
516
63
Load (Grid+Industrial+Auxiliary+ Desalination)
20
21
Compensation Capacitor
3
71
3
75
Grid Losses
0.59
0.61
Grid Active Power Losses as a Percentage of Total Generation (%)
Generation Margin
701
701
Installed Capacity
492
519
Generation
--5.58
Load Growth Rate (%)
209
182
Margin
29.8
25.9
Margin (%)
2016
MW Mvar
2017
MW
Mvar
2018
MW
Mvar
543
0
543
541
562
0
562
559
586
0
586
584
228
0
228
178
20
2
70
0.45
228
0
228
184
21
65
2
226
0
226
192
21
55
2
0.39
0.27
701
701
1101
543
562
586
4.71
3.46
4.43
158
139
515
22.5
19.9
46.8
Page | 58
Substations
Al Qarm
Ashoor
Ittin
NPS
A’Saada
Awaqad
SFZ
Thumrait
Al Qarm
Ashoor
Awqad
Ittin
NPS
A’Saada -A
A’Saada-B
SFZ-A
SFZ-B
Thumrait
Substations
Al Qarm
Ashoor
Ittin
NPS
A’Saada
Awaqad
SFZ
Thumrait
Al Qarm
Ashoor
Awqad
Ittin
NPS
A’Saada -A
A’Saada-B
SFZ-A
SFZ-B
Thumrait
Table C.6: Maximum 3-Phase Short Circuit Fault Levels
Switchgear
Max Three-Phase Short Circuit Ik" (kA)
Voltage
Fault Rating
(kV)
2014
2015
2016
2017
(kA)
12.32
12.29
12.29
12.29
132
31.5
15.70
15.68
15.68
16.87
132
31.5
11.48
11.43
11.43
11.75
132
31.5
12.05
11.96
11.96
13.99
132
31.5
8.04
11.83
132
31.5
8.61
8.57
8.57
12.01
132
31.5
12.02
11.93
11.93
13.99
132
31.5
4.99
4.98
4.98
5.04
132
31.5
10.04
10.03
10.03
10.03
33
25
16.24
16.24
16.24
16.60
33
25
13.08
13.05
13.05
14.99
33
25
14.73
14.71
14.71
14.87
33
25
12.90
12.89
12.89
13.29
33
25
12.67
14.90
33
25
14.90
33
25
14.85
14.81
14.81
15.66
33
25
15.81
33
25
5.34
5.34
5.34
5.36
33
25
2018
14.64
19.55
14.96
21.54
14.40
15.81
21.69
5.55
10.44
17.29
16.46
16.17
14.22
15.97
15.97
17.75
17.95
5.52
Table C.7: Maximum 1- Phase Short Circuit Fault Levels
Max Single-Phase Short Circuit Ik" (kA)
Voltage
Switchgear Fault Rating
(kV)
(kA)
2014
2015
2016
2017
2018
12.78
12.76
12.77
12.78
14.39
132
31.5
19.88
19.85
20.06
21.39
24.18
132
31.5
12.95
12.91
12.91
13.22
15.83
132
31.5
15.51
15.40
15.40
18.10
27.53
132
31.5
8.92
14.20
16.58
132
31.5
9.85
9.81
9.81
13.81
17.06
132
31.5
15.43
15.33
15.33
18.11
27.98
132
31.5
4.87
4.86
4.86
4.90
5.21
132
31.5
2.05
2.05
2.05
2.05
2.06
33
25
2.99
2.99
2.99
2.99
3.00
33
25
2.94
2.94
2.94
2.97
2.99
33
25
2.92
2.92
2.92
2.92
2.94
33
25
2.62
2.62
2.62
2.62
2.63
33
25
2.93
2.97
2.98
33
25
2.97
2.98
33
25
2.97
2.97
2.97
2.98
3.00
33
25
2.94
2.96
33
25
1.76
1.76
1.76
1.76
1.76
33
25
Page | 59
DIgSILENT
0.44 kV
1.01 p.u .
THU EAT 2
ITT Aux 1(..
0.00
0.00
0.00
0.00
0.00
0.00
THU33-2
Thumra it 2x30M VA
33.17 kV
1.01 p.u .
-15.20
-5.00
28.95
15.20
5.00
PDO
Thumrai t 33kV l oad
12
Thumrait
15.20
5.64
28.95
Thumrait 132kV BB
Harwheel
131.4 4..
1.00 p.u .
PDO Int erconnector 1
-18.66
37.23
5.93
SFZ-Ittin 132kV l ine
SFZ-Awa qad 132kV l ine
Itti n-Al Quram 132kV l ine
0.00
0.00
0.00
-4
-75.00
-24.65
34.45
Awqad 33kV BB
18.71
-38.16
5.93
10.60
10.60
4.14
4.14
20.37
20.37
0
-159.8 0
5.08
22.31
IWPP GT1-5
Al Qura m 33kV l oad
131.9 4..
1.00 p.u .
121.8 5
32.36
53.25
ITT Aux 1
ITT C1
4
0.00
-20.44
3
4.00
1.31
Ittin 2x125M VA
10.60
4.14
21.68
153.0 0
124.7 4
59.51
T44(1)
NPS GT1-6 TX
124.3 7
93.50
21.54
153.0 0
124.7 4
62.67
15.24
-0.60
4.45
0.44 kV
1.01 p.u .
-0.00
0.00
0.00
Ashoor132kV BB
-121.8 0
-19.60
53.25
33.36 kV
1.01 p.u .
121.8 0
40.03
NPS 2x63M VA
Figure C.1 OETC-Dhofar Transmission System
2014 Max.Load Flow Condition
18.40
1.69
42.65
T10
NPS E AT 1
0.00
-0.00
0.00
13
0.44 kV
1.01 p.u .
-0.00
-0.00
0.00
Itti n 33kV l oad
18.40
1.69
46.20
0.43 kV
1.00 p.u .
-0.00
0.00
0.00
-33.10
-16.22
31.83
40.41
14.88
18.44
~
G
NPS Aux 1
-4
0
-198.4 6
-46.18
42.75
IWPP ST2
~
G
~
G
58.20
16.28
53.72
53.42
4.91
47.69
58.20
16.28
53.01
0
-58.19
-12.16
53.01
53.42
4.91
47.66
-1
-53.42
-1.67
47.66
6.00
1.97
28.00
9.20
Aux IWPP
Desl IWWP
Ittin 33kV B..
-152.9 1
-109.9 7
59.51
33.14
18.35
31.83
NPS G8
Aux NPS
IWPP ST1
198.5 0
59.23
42.75
134.2 8..
1.02 p.u .
Ashoor
Salalah Airport load
132.9 9..
1.01 p.u .
6.00
1.97
~
G
198.5 0
59.23
41.64
235.6 5
33.96
42.16
-5
0.00
-0.00
0.00
235.6 1
42.02
32.86
-235.6 1
-42.02
42.16
Ashoor 2x125M VA
NPS132kV BB
~
G
Ittin 132kV B..
ITTIN E AT 1
NPS-S FZ 132kV line
NPS
NPS G7
Salalah-1 IWPP
73.50
24.16
Ittin
~
G
QRM Aux 1
0.00
-0.00
0.00
33.06 kV
1.00 p.u .
75.00
24.65
Awqad 33kV l oad
NPS G1-6
0.43 kV
1.00 p.u .
-0.00
0.00
0.00
Al Quram 33kV BB
33.00 kV
1.00 p.u .
NPS Pow er Plant
-6
-73.50
-24.16
66.86
IWPP GT1-5 Tx
SFZ 33kV..
IWPP ST2 Tx
0.43 kV
1.00 p.u .
-0.00
-0.00
0.00
Awqad EAT
67.80
22.28
73.66
33.45
66.86
IWPP ST1 Tx
Awqad Aux
33.26 kV
1.01 p.u .
-234.1 0
-32.00
32.86
160.4 4
-1.45
22.31
132.3 9..
1.00 p.u .
Al Quram -Ash oor 132kV Cable
0.00
0.00
0.00
SFZ 33kV BB
Al Qarm132kV BB
Al Quram -Ash oor 132kV line
75.02
29.99
34.45
SFZ EA T 1
-67.80
-22.28
30.90
Al Qarm
132.0 8..
1.00 p.u .
0.44 kV
1.01 p.u .
-0.00
-0.00
0.00
-1
-18.39
-0.70
42.65
NPS 33kV BB
33.09 kV
1.00 p.u .
-40.40
-13.28
18.44
Ashoor 33kV BB
AShoor EAT 1
SFZ Aux 1
11
Ittin-Thu mrait 132kV line
SFZ 2x125M VA
Awqad 132kV BB
-124.3 5
-93.42
21.54
Aw qad
-75.02
-29.99
11.26
Al Quram 2x63M VA
67.84
26.76
30.90
124.3 5
93.42
27.70
Awqad 2x125M VA
132.9 3..
1.01 p.u .
-124.3 5
-93.73
27.70
75.17
30.06
11.26
QRM EAT 1
-18.66
36.91
7.41
SFZ-NP S Cab 1
SFZ132kV BB
18.66
-37.23
7.41
-15.20
-5.64
4.45
SFZIttin132kV Ca b1
SFZ
IW PP Aux 1
0.00
0.00
0.00
33.22 kV
1.01 p.u .
40.40
13.28
Ashoo r 33kV l oad
51.50
16.93
NPS 33kV l oad
OETC
Pl anni ng Dpt
PowerFactory 14.1.6
2014 Peak Load in OETC-Dhofar Network
Summer Peak Load
Studied Areas: Majan, Mazoon, Muscat
(Master Model)
Project: 2014
Graphic: Grid
Date: 6/22/2014
Annex:
OETC
Page | 60
DIgSILENT
0.43 kV
1.00 p.u .
THU EAT 2
ITT Aux 1(..
0.00
0.00
-0.00
-0.00
0.00
0.00
THU33-2
Thumrait
Thumra it 2x30M VA
32.95 kV
1.00 p.u .
-15.40
-7.46
31.15
15.40
7.46
PDO
12
15.40
8.21
31.15
Thumrait 132kV BB
Harwheel
131.4 5..
1.00 p.u .
-16.55
11.55
2.91
SFZ
77.76
5.16
10.85
SFZ EA T 1
SFZ Aux 1(1..
0.43 kV
1.00 p.u .
-0.00
-0.00
0.00
-2
Awqad EAT
71.90
34.82
0.00
0.00
0.00
SFZ 33kV..
-3
-77.20
-0.00
66.48
-77.60
-0.00
33.87
0.44 kV
1.01 p.u .
-0.00
0.00
0.00
QRM Aux 1
0.00
-0.00
0.00
Al Quram 33kV BB
33.18 kV
1.01 p.u .
Awqad 33kV BB
77.20
0.00
33.00 kV
1.00 p.u .
Salalah IWPP
77.60
-0.00
IWPP GT1-5
NPS GT1-6
NPS GT7
~
G
~
G
NPS GT7 TX
NPS GT1-6 Tx
133.1 7
56.62
20.12
131.0 6
-5.89
57.08
-161.9 3
-59.40
54.72
ITT C1
4
11.20
11.20
21.44
21.44
43.86
43.86
0.00
-20.55
-1
Ittin 2x125M VA
ITT Aux 1
8.00
-0.00
0.44 kV
1.01 p.u .
-0.00
0.00
0.00
Ashoor
-2
Ashoor132kV BB
0.00
-0.00
0.00
-131.0 0
20.55
57.08
~
G
~
G
61.50
11.71
55.65
55.27
11.31
50.15
210.0 0
0.43
44.46
61.50
11.71
55.61
55.27
11.31
50.12
250.9 0
0.47
44.52
-2
-209.9 6
12.98
44.46
41.81
1.57
18.22
Ashoor 2x125M VA
NPS GT8
NPS 2x63M VA
NPS GT8 TX
NPS E AT 1
14
0.43 kV
1.00 p.u .
-0.00
0.00
0.00
19.50
1.74
48.94
0.43 kV
1.00 p.u .
-0.00
-0.00
0.00
0.00
-0.00
0.00
Itti n 33kV l oad
~
G
NPS Aux 1
-33.91
-20.47
34.20
-1
-55.26
-7.72
50.12
28.00
-0.00
6.00
-0.00
Desl IWPP
Aux IWPP
33.45 kV
1.01 p.u .
33.95
22.92
34.20
-5
-1
-61.49
-7.29
55.61
133.3 3..
1.01 p.u .
131.0 0
0.00
Aux NPS
IWPP ST2
~
G
210.0 0
0.43
42.21
Ittin 33kV B..
132.4 4..
1.00 p.u .
6.00
-0.00
IWPP ST1
250.8 5
8.34
34.67
-250.8 5
-8.34
44.52
19.50
1.74
45.19
-41.80
-0.00
18.22
-1
Ashoor 33kV BB
-19.49
-0.63
45.19
NPS 33kV BB
33.09 kV
1.00 p.u .
53.40
21.11
AShoor EAT 1
NPS132kV BB
-2
132.1 2..
1.00 p.u .
11.20
21.44
46.08
162.0 0
71.27
54.72
-171.0 6
16.68
23.96
IWPP GT1-5 Tx
NPS Power Plant
15.44
1.97
4.79
Al Quram -Ash oor 132kV Cable
Ittin 132kV B..
16.56
-12.76
2.91
ITTIN E AT 1
NPS-S FZ 132kV line
Awqad 33kV l oad
162.0 0
71.27
56.19
NPS
Ittin
IWPP ST2 Tx
0.00
0.00
0.00
33.11 kV
1.00 p.u .
77.36
9.34
66.48
IWPP ST1 Tx
-71.90
-34.82
34.75
SFZ 33kV BB
132.3 3..
1.00 p.u .
Al Qarm
Al Quram 2x63M VA
77.62
5.16
33.87
0.43 kV
1.00 p.u .
-0.00
-0.00
0.00
-249.1 6
2.98
34.67
171.8 0
-12.31
23.96
QRM132kV BB
132.0 6..
1.00 p.u .
SFZ 2x125M VA
Awqad 132kV BB
SFZ Aux 1
10
Awqad 2x125M VA
133.1 6
56.56
25.86
-133.1 6
-56.56
20.12
Awqad
-77.62
-5.16
10.85
71.95
40.47
34.75
QRM EAT 1
-16.55
11.23
3.60
132.4 0..
1.00 p.u .
-133.1 6
-56.87
25.86
SFZ-NP S Cab 1
SFZ132kV BB
16.55
-11.55
3.60
-15.40
-8.21
4.79
SFZIttin132kV Ca b1
IW PP Aux 1
0.00
0.00
0.00
33.03 kV
1.00 p.u .
41.80
-0.00
Ashoo r 33kV l oad
NPS 33kV l oad
OETC
Planning Dpt
PowerFactory 14.1.6
Summer Peak Load
(Master Model)
Project: 2015
Graphic: Grid
Date: 6/22/2014
Annex:
OETC
Page | 61
DIgSILENT
0.44 kV
1.01 p.u .
THU EAT 2
Thumrait Aux 1
0.00
0.00
-0.00
-0.00
0.00
0.00
THU33-2
Thumra it 2x30M VA
33.21 kV
1.01 p.u .
Thumrait
-15.60
-5.13
29.67
15.60
5.13
PDO
12
15.60
5.81
29.67
Thumrait 132kV BB
Harwheel
131.6 6..
1.00 p.u .
80.50
32.75
12.07
Al Qarm
QRM132kV BB
41.05
16.40
37.32
ITT Aux 1
0.00
-20.40
SFZ 33kV l oad
-4
0.00
-0.00
0.00
-99.00
-12.14
43.09
33.33 kV
1.01 p.u .
NPS GT1-6
132.1 6..
1.00 p.u .
80.32
32.53
36.93
SFZ Aux 1(1..
-1
0.43 kV
1.00 p.u .
-0.00
0.00
0.00
0.00
0.00
0.00
32.96 kV
1.00 p.u .
6.00
1.97
NPS 2x63M VA
~
G
58.03
22.74
55.40
64.20
23.16
59.87
58.03
22.74
54.68
Aux NPS
182.0 9
3.81
32.37
13
0.43 kV
1.00 p.u .
-0.00
0.00
0.00
Awqad 33kV l oad(1)
-43.20
-14.20
19.88
Ashoor 33kV BB
55.30
18.18
NPS 33kV l oad
summer Peak Load
(Master Model)
0
-64.18
-17.91
59.87
0
-58.02
-18.37
54.68
28.00
9.20
6.00
1.97
Desl IWPP
Aux IWPP
Ashoor
-82.00
-26.95
37.50
33.15 kV
1.00 p.u .
-1
-20.39
1.68
47.10
-1
-219.4 5
-28.55
46.78
133.2 9..
1.01 p.u .
43.21
16.06
19.88
0.00
0.00
0.00
IWPP ST2
~
G
64.20
23.16
60.67
219.5 0
43.79
46.78
Saada h 33kV l oad
NPS GT8 TX
NPS E AT 1
Ashoor132kV BB
IWPP ST1
~
G
219.5 0
43.79
44.99
82.36
33.79
12.39
-5
~
G
33.31 kV
1.01 p.u .
OETC
Planning Dpt
0.43 kV
1.00 p.u .
-0.00
0.00
0.00
20.40
-0.47
47.10
NPS 33kV BB
PowerFactory 14.1.6
Saadah Aux 1
82.00
26.95
20.40
-0.47
51.01
0.44 kV
1.01 p.u .
-0.00
-0.00
0.00
0.00
0.00
0.00
-82.03
-33.28
12.39
Saadah 33kV BB
80.30
26.39
NPS GT8
NPS Aux 1
-34.91
-19.86
34.45
-4
-80.30
-26.39
36.93
Awqad 33kV BB
34.95
22.34
34.45
Saadah 2x125M VA
~
G
11.70
11.70
19.19
19.19
40.74
40.74
133.1 5..
1.01 p.u .
-5
82.03
33.28
37.50
Saadah EAT
139.8 5
96.95
23.53
IWPP GT1-5
182.0 6
11.99
25.22
-182.0 6
-11.99
32.37
131.5 6..
1.00 p.u .
Ashoo r-Saadah 132kV l ine
11.70
19.19
42.81
-1
NPS GT7 TX
NPS GT1-6 TX
NPS
NPS132kV BB
Saadah 132kV BB
Awqad 2x125M VA
~
G
169.2 0
119.1 0
65.69
169.2
169.2 0
0
119.1
0
119.1 0
62.52
62.52
Salalah IWPP
41.00
13.48
Saadah
Itti n 33kV l oad
NPS GT7
Awqad EAT
NPS-S FZ 132kV line
NPS Power Plant
QRM Aux 1
0.00
-0.00
0.00
33.04 kV
1.00 p.u .
99.00
32.54
Awqad
0.43 kV
1.00 p.u .
-0.00
0.00
0.00
Al Quram 33kV BB
Ittin 33kV B..
Awqad 132kV BB
-4
-41.00
-13.48
37.32
IWPP ST2 Tx
4
IWPP ST1 Tx
76.20
25.05
0.44 kV
1.01 p.u .
-0.00
0.00
0.00
ITTIN E AT 1
ITT C1
33.20 kV
1.01 p.u .
IWPP GT1-5Tx
0.00
0.00
0.00
SFZ 33kV BB
8.00
2.63
99.03
20.49
43.09
-80.32
-32.53
12.07
-181.1 7
-6.58
25.22
140.1 2
-9.82
19.54
132.3 6..
1.00 p.u .
132.1 7..
1.00 p.u .
Ashoor 2x125M VA
-76.20
-25.05
34.79
-139.6 3
12.34
19.54
Ashoor-Al qarm 13..
Ittin 132kV B..
SFZ EA T 1
139.8 3
96.86
30.25
-139.8 3
-96.86
23.53
0.44 kV
1.01 p.u .
-0.00
-0.00
0.00
15.64
-0.45
4.56
AShoor EAT 1
SFZ Aux 1
11
16.96
-35.01
5.42
Al Quram 2x63M VA
SFZ 2x125M VA
Ittin
Ittin 2x125M VA
SFZ-NP S 132kV cabl e
76.25
30.72
34.79
QRM EAT 1
-16.91
34.02
5.42
-16.91
33.70
6.75
133.0 8..
1.01 p.u .
-139.8 3
-97.17
30.25
SFZ
SFZ132kV BB
16.91
-34.02
6.75
-15.60
-5.81
4.56
SFZIttin132kV Ca b1
IW PP Aux 1
0.00
0.00
0.00
32.93 kV
1.00 p.u .
43.20
14.20
Ashoo r 33kV l oad
Project: 2016
Graphic: Grid
Date:
Annex:
6/22/2014
OETC
Page | 62
DIgSILENT
0.44 kV
1.01 p.u .
THU EAT 2
ITT Aux 1(..
0.00
0.00
-0.00
-0.00
0.00
0.00
THU33-2
Thumra it 2x30M VA
33.22 kV
1.01 p.u .
Thumrait
-15.90
-5.23
30.23
15.90
5.23
PDO
12
15.90
5.93
30.23
Thumrait 132kV BB
Harwheel
131.7 5..
1.00 p.u .
-15.90
-5.93
4.65
62.81
3.43
27.06
-50.00
-16.43
22.65
ITT Aux 1
ITT C1
4
0.00
-20.51
8.00
2.63
-3
0.00
-0.00
0.00
-62.80
-0.13
27.06
83.20
27.35
0.00
0.00
0.00
Aux NPS
Awqad 33kV l oad(1)
Saadah -B 2x125M VA
0.44 kV
1.01 p.u .
-0.00
0.00
0.00
-5
Saadah-B Aux 1
-64.90
-21.33
29.64
0.44 kV
1.01 p.u .
-0.00
-0.00
0.00
Ashoor132kV BB
~
G
66.40
14.92
60.49
66.40
14.92
60.45
66.40
14.92
60.45
123.1 4
-0.64
21.95
-1
-220.9 7
-37.79
47.53
44.81
16.74
20.69
0.00
0.00
0.00
64.90
21.33
60.00
19.72
Saada h-A 33kV l oad
Saada h-B 33kV l oad
21.00
-0.52
48.48
13
0.43 kV
0.99 p.u .
-0.00
-0.00
0.00
-44.80
-14.73
20.69
Ashoor 33kV BB
-20.99
1.80
48.48
-1
-66.38
-9.70
60.45
-1
-66.38
-9.70
60.45
28.00
9.20
6.00
1.97
Desl IWPP
Aux IWPP
Ashoor
-60.00
-19.72
27.35
33.25 kV
1.01 p.u .
-1
IWPP ST2
~
G
66.40
14.92
60.49
221.0 1
53.52
47.53
132.9 0..
1.01 p.u .
Saadah-B 33kV BB
33.19 kV
1.01 p.u .
IWPP ST1
~
G
221.0 1
53.52
45.71
151.7 8
29.92
21.47
-5
~
G
21.00
-0.52
52.52
NPS GT8 TX(1)
NPS 2x63M VA
NPS E AT 1
0.00
-0.00
0.00
Saadah-A Aux 1
Saadah-A 33kV BB
6.00
1.97
NPS GT8
NPS Aux 1
-11.31
-12.42
14.40
-5
-83.20
-27.35
38.10
33.10 kV
1.00 p.u .
0.44 kV
1.01 p.u .
-0.00
0.00
0.00
-150.7 8
-24.82
21.47
Ashoor 2x125M VA
0.00
0.00
0.00
Awqad 33kV BB
11.31
12.86
14.40
Saadah -A 2x125M VA
0.43 kV
1.00 p.u .
-0.00
-0.00
0.00
Saadah-B EAT
-1
132.8 6..
1.01 p.u .
-4
60.01
23.09
27.35
Ashoo r-Saadah 132kV l ine
SFZ Aux 1(1..
12.10
12.10
20.11
20.11
42.55
42.55
Saadah-A EAT
NPS GT7 TX
NPS GT1-6 TX
169.2 7
111.8 7
28.12
64.92
25.28
29.64
Awqad-Saadah 132kv l ine
~
G
12.10
20.11
44.71
-1
Awqad 2x125M VA
~
G
174.6
174.6 0
0
124.9
124.9 4
4
64.87
64.87
Awqad EAT
NPS-S FZ 132kV line
NPS
-25.82
22.77
4.91
IWPP GT1-5
25.85
-23.55
4.91
131.4 3..
1.00 p.u .
123.1 3
7.68
17.10
-123.1 3
-7.68
21.95
131.0 1..
0.99 p.u .
NPS GT7
174.6 0
124.9 4
68.16
NPS132kV BB
Saadah 132kV BB
83.23
33.88
38.10
Salalah IWPP
43.10
14.17
Saadah
Itti n 33kV l oad
IWPP ST2 Tx
Awqad 132kV BB
QRM Aux 1
0.00
-0.00
0.00
32.97 kV
1.00 p.u .
62.80
20.64
NPS GT1-6
0.43 kV
1.00 p.u .
-0.00
-0.00
0.00
Al Quram 33kV BB
33.42 kV
1.01 p.u .
NPS Power Plant
-4
-43.10
-14.17
39.32
Ittin33kV B..
Awqad
-57.40
-56.65
11.30
-122.7 2
-5.86
17.10
79.56
-11.56
11.19
132.2 6..
1.00 p.u .
IWPP ST1 Tx
SFZ-B 33kV l oad
0.44 kV
1.01 p.u .
-0.00
0.00
0.00
ITTIN E AT 1
50.00
16.43
54.30
17.85
SFZ-A 33kV l oad
QRM132kV BB
IWPP GT1-5 Tx
33.46 kV
1.01 p.u .
33.02 kV
1.00 p.u .
-79.40
11.63
11.19
43.16
17.41
39.32
SFZ-B 33kV BB
SFZ-A 33kV BB
15.94
-0.33
4.65
132.2 8..
1.00 p.u .
0.00
0.00
0.00
Ittin 132kV B..
IWPP-ALQ Cable 1
0.00
0.00
0.00
-7.35
-17.35
2.62
-4
AShoor EAT 1
-54.30
-17.85
24.92
Al Qarm
Ittin
SFZ-B 2x125M VA
SFZ-A EAT 1
169.2 5
111.7 3
36.14
-169.2 5
-111.7 3
28.12
0.44 kV
1.01 p.u .
-0.00
-0.00
0.00
0.43 kV
1.00 p.u .
-0.00
0.00
0.00
SFZ-B EAT 1(1)
SFZ-A 2x125M VA
SFZ Aux 1
12
57.55
56.72
11.30
Al Quram 2x63M VA
50.01
18.74
22.65
ITT-B Aux 1(2)
Ittin 2x125M VA
SFZ-NP S 132kV cabl e
54.32
20.77
24.92
QRM EAT 1
7.37
16.12
2.62
7.37
15.80
3.16
132.7 8..
1.01 p.u .
-169.2 5
-112.0 4
36.14
SFZ
SFZ132kV BB
-7.37
-16.12
3.16
SFZIttin132kV Ca b1
IW PP Aux 1
0.00
0.00
0.00
32.81 kV
0.99 p.u .
44.80
14.73
NPS 33kV BB
33.32 kV
1.01 p.u .
32.30
10.62
NPS 33kV l oad
OETC
Planning Dpt
PowerFactory 14.1.6
Summer Peak Load
(Master Model)
Ashoo r 33kV l oad
Project: 2017
Graphic: Grid
Date:
Annex:
6/22/2014
OETC
Page | 63
DIgSILEN
0. 44
1. 01
kV
p. .
T HU
EA T
2
ITT Aux 1(..
0. 00
-00. .0000
-00. .0000
0. 00
THU33- 2
2 x 3 0M V A
3 3. 2 5 kV
1 . 0 1 p. .
- 1 6. 1 0
- 5. 29
3 0. 5 8
ait
Salalah-2 IPP
G T
Sala la h- 2 I PP
~
G
e
I nt er co nn e c t o r 1
- T hu m r a it
7 1. 8 3
1 1. 7 8
1 2. 9 5
I t t in - Al Q u r a m 1 32 k V lin e
I t t in
- 6 8. 7 6
1 1. 9 8
4 6. 1 6
PDO
1 32 k V lin
SFZ - I t t in 1 32 k V lin e
7 1. 8
1 2. 1
1 0. 1
Ca b1
3
0
1
- 1 6. 1 0
- 6. 01
4. 70
SFZ I t t in 1 32 k V
- 7 1. 8 3
- 1 2. 1 0
1 2. 9 5
ST
I PP
PDO
Ha rw he el
1 31 . 87 . .
1 . 0 0 p. .
6 8. 7 7
- 8. 14
4 6. 1 6
Tx
Tx
T hu m r ait 3 3k V lo ad
12
1 6. 1 0
6. 01
3 0. 5 8
Thumrait 132kV BB
S ala la h - 2
I TT - A C1
e
- 3
0. 00
- 0. 00
0. 00
- 6 5. 1 0
- 0. 88
2 8. 0 5
- 4 5. 2 0
- 1 4. 8 6
4 1. 2 7
Sala la h Air p or t lo a d
I t t in 33kV B . .
0 . 4 3 kV
1 . 0 0 p. .
- 0. 00
0. 00
0. 00
0. 00
- 0. 00
0. 00
Al Quram 33kV BB
3 2. 9 4 kV
1 . 0 0 p. .
6 5. 1 0
2 1. 4 0
4 5. 2 0
1 4. 8 6
Salalah-1 IWPP
I W PP
2 x 6 3M V A
NPS
Awq a d 3 3k V lo ad
Tx
1-5
GT
I W PP
12
4 3. 6 0
1 3. 7 2
4 0. 6 0
ST 1
1
Cab le
AL Q
I W PP 2 x 1 25 M V A
or
Saadah-B
Saa d ah - B 3 3k V lo ad
- 4 6. 3 0
- 1 5. 2 2
2 1. 1 8
Ashoor 33kV BB
- 1
- 4 3. 5 9
- 1 1. 3 7
4 0. 6 0
4 3. 6 0
1 3. 7 2
4 0. 6 0
- 1
- 4 3. 5 9
- 1 1. 3 7
4 0. 6 0
2 8. 0 0
9. 20
6. 00
1. 97
Des l I W PP
Aux I W PP
IWPP Aux 1
0 . 4 3 kV
1 . 0 0 p. .
- 0. 00
0. 00
0. 00
0. 00
0. 00
0. 00
3 3. 1 4 kV
1 . 0 0 p. .
4 6. 3 0
1 5. 2 2
Figure C.5 OETC-D hofar Transmission System
2018 Max. Load Flow Condition
3 3. 5 0
1 1. 0 1
OET C
Pla n n i n g D p t
6 2. 3 0
2 0. 4 8
1 3. 8 0
4. 02
3 2. 7 6
3 3. 2 7 kV
1 . 0 1 p. .
Pow er Fact or y 14. 1 . 6
- 1 48 . 98
- 4 2. 7 3
3 2. 8 7
4 6. 3 2
1 7. 3 3
2 1. 1 8
3 3. 2 4 kV
1 . 0 1 p. .
Saadah-A
- 1 3. 8 0
- 3. 42
3 2. 7 6
NPS 33kV BB
NPS
Ashoor
- 6 2. 3 0
- 2 0. 4 8
2 8. 4 1
0
0. 00
- 0. 00
0. 00
NPS
- 1 9. 7 0
- 7. 59
1 8. 1 4
3 3. 1 9 kV
1 . 0 1 p. .
6 7. 1 0
2 2. 0 5
Aux NPS
0. 00
0. 00
0. 00
1 32 . 87 . .
1 . 0 1 p. .
Saadah-B 33kV BB
Saa d ah - A 3 3k V lo ad
G T8
EA T
NPS
1
- 3
8 6. 1 0
2 8. 3 0
G T8
~
G
1 3. 8 0
4. 02
3 5. 9 3
TX
0 . 4 4 kV
1 . 0 1 p. .
- 0. 00
0. 00
0. 00
- 6 7. 1 0
- 2 2. 0 5
3 0. 6 5
Ashoor132kV BB
1 49 . 00
5 0. 2 5
3 2. 8 7
- 1
6 2. 9 7
3. 05
1 1. 3 9
ST 2
~
G
4 3. 6 0
1 3. 7 2
4 0. 6 3
1
6. 00
1. 97
NPS
NPS Au x 1
0. 00
0. 00
0. 00
Saadah-A 33kV BB
0 . 4 4 kV
1 . 0 1 p. .
- 0. 00
- 0. 00
0. 00
9 2. 8 7
3 3. 9 3
1 3. 7 8
Ash o
1 9. 7 2
8. 29
1 8. 1 4
Saadah-B Aux
Ash o or - Saa da h 1 32 k V lin e
- 5
ST 1I W PP
~
G
4 3. 6 0
1 3. 7 2
4 0. 6 3
EA T
3 3. 1 0 kV
1 . 0 0 p. .
- 5
GT 1 I- 5W PP
~
G
1 49 . 00
5 0. 2 5
3 1. 6 1
or
- 8 6. 1 0
- 2 8. 3 0
3 9. 4 3
Awqad 33kV BB
0 . 4 4 kV
1 . 0 1 p. .
- 0. 00
0. 00
0. 00
6 2. 3 1 - 9 2. 4 6
2 4. 1 1 - 3 2. 8 6
2 8. 4 1 1 3. 7 8
ah - B 2 x 1 25 M V A
d
0. 00
0. 00
0. 00
1 32 k v lin e
Saadah-A Aux
6 7. 1 2
2 6. 2 8
3 0. 6 5
- 6 2. 9 7
- 1 1. 4 8
1 1. 3 9
S aa d
Awq a d- Sa ad ah
- 5
6 2. 9 7
1 1. 4 8
8. 90
3 3k V lo ad
A Sh o
0
1 33 . 14 . .
1 . 0 1 p. .
3 7. 0 1
1 6. 8 2
5. 75
S aa da h- B EA T
G T7
0
0 . 4 3 kV
1 . 0 0 p. .
- 0. 00
- 0. 00
0. 00
E AT
88 .. 00 00
22 4.
4. 55 22
44 6.
6. 11 77
TX
11 15
15 .. 20
20
11 48
48 .. 84
84
55 6.
6. 11 66
Awqa d Aux
Al Q u r am
1 31 . 08 . .
0 . 9 9 p. .
- 3 6. 9 7
- 1 7. 5 3
5. 75
S aa da h- A EA T
~
G
NPS
9 7. 4 0
1 48 . 46
2 4. 5 6
G T7
2 x 1 25 M V A
NPS
8. 00
2 4. 5 2
4 9. 1 3
NPS
G T1 - 6
TX
NPS -
NPS
NPS132kV BB
G T1 - 6
~
G
1 15 . 20
1 48 . 84
5 9. 7 5
A wq ad
NPS
8 6. 1 3
3 5. 2 9
3 9. 4 3
3 3k V lo ad
Saadah 132kV BB
1 31 . 57 . .
1 . 0 0 p. .
A wq a
1 32 k V lin
SF Z
NPS Power Plant
I t t in
ah - A 2 x 1 25 M V A
e
Awqad
S aa d
- 1 23 . 14
- 5 2. 1 1
1 8. 7 1
Awqad 132kV BB
Tx
3 3. 4 3 kV
1 . 0 1 p. .
Tx
0. 00
- 2 0. 5 2
1 32 k V lin
QRM Au x 1
- 4
4
SFZ - B 3 3k V lo ad
am - As ho or
2 x 6 3M V A
am
8. 00
2. 63
ST 2
SFZ-B
6 5. 1 1
4. 42
2 8. 0 5
I W PP
5 2. 0 0
1 7. 0 9
SFZ-A
SFZ - A 3 3k V lo ad
0 . 4 4 kV
1 . 0 1 p. .
- 0. 00
- 0. 00
0. 00
I W PP
5 6. 4 0
1 8. 5 4
ITT-A Aux 1
Al Q u r
3 3. 0 7 kV
1 . 0 0 p. .
4 5. 2 6
1 8. 4 4
4 1. 2 7
1
SFZ 33kV BB
- 6 2. 8 6
- 1 1. 8 8
8. 90
1 7. 6 0
- 6. 55
2. 61
1 32 . 32 . .
1 . 0 0 p. .
1
- 5 2. 0 0
- 1 7. 0 9
2 3. 5 2
SFZ-B 33kV BB(1)
3 3. 5 1 kV
1 . 0 2 p. .
QRM132kV BB
- 1 7. 5 9
5. 49
2. 61
Al Q u r
0. 00
- 0. 00
0. 00
0. 00
0. 00
0. 00
1 6. 1 4
- 0. 26
4. 70
Ittin
1 32 . 41 . .
1 . 0 0 p. .
I TT I
- 5 6. 4 0
- 1 8. 5 4
2 5. 8 5
Ittin 132kV B..
I t t in
1
S FZ
- 9 7. 3 8
- 1 48 . 35
2 4. 5 6
Al Qarm
- 7 1. 6 7
- 1 2. 2 8
1 0. 1 1
SFZ - Awaq ad 1 32 k V lin e
- 4
E AT
0 . 4 4 kV
1 . 0 2 p. .
- 0. 00
0. 00
0. 00
Sa la la h- 2 I PP
N EA T
Aux
EA T
S FZ
9 7. 3 8
1 48 . 35
3 1. 5 8
0 . 4 3 kV
1 . 0 0 p. .
- 0. 00
- 0. 00
0. 00
1 23 . 55
5 3. 9 8
1 8. 7 1
Q RM
SFZ Au x
SFZ A ux 1
12
5 2. 0 1
1 9. 5 8
2 3. 5 2
2 x 1 25 M V A
6. 00
1. 97
B 2 x 1 25 M V A
S FZ -
2 x 1 25 M V A
NP S 1 32 k V c
5 6. 4 2
2 1. 6 8
2 5. 8 5
S FZ -
ab le
1 33 . 04 . .
1 . 0 1 p. .
- 9 7. 3 8
- 1 48 . 66
3 1. 5 8
S FZ - B E AT
G T
1 43 . 70
- 2 0. 6 7
4 0. 3 3
S ala la h - 2
I PP
Thumrait
6 8. 7 7
- 8. 14
4 6. 1 6
- 1 43 . 68
2 7. 6 9
4 0. 3 3
SFZ132kV BB
ST
~
G
1 43 . 70
- 2 0. 6 7
4 0. 3 3
T hu m r
Sala la h- 2 I PP
1 6. 1 0
5. 29
3 3k V lo ad
Ash o or 3 3k V lo ad
2018 Pea k Load in O ETC-Dh of ar Net workPr o ject : 2018
G raphic: G r id
Sum m er Peak Load
St udied Areas: M ajan, M azoon, M uscat
(M ast er M odel)
Dat e:
Annex:
6/ 22 / 2014
O ETC
Page | 64

Dhofar 2014 Capability Statement - Oman Electricity Transmission

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