TENDER NO:MGVCL/RAPDRP/SCADA/222A ITEM- A: TECHNICAL SPECIFICATION FOR OUTDOOR 11 KV RING

Transcription

TENDER NO:MGVCL/RAPDRP/SCADA/222A
ITEM- A: TECHNICAL SPECIFICATION FOR OUTDOOR 11 KV RING
MAIN UNIT SWITCHGEAR
1.1
GENERAL:
1.1.1
All equipment and material shall be designed
accordance with the latest applicable IEC standard.
1.1.2
Equipment and material conforming to any other standard, which ensures equal or
better quality, may be accepted. In such case copies of English version of the
standard adopted shall be submitted.
1.1.3
The electrical installation shall meet the requirement of Indian Electricity Rules-1956
as amended up to date; relevant IS code of practice and Indian Electricity Act-1910.
In addition other rules and regulations applicable to the work shall be followed. In case any
discrepancy ,the most stringent and restrictive one shall be binding.
1.1.4
The high-tension switchgear offered shall in general comply with the latest issues
including amendments of the following standards but not restricted to them.
1.2
SCOPE:
manufactured
and
tested in
Design, Engineering, Manufacture, assembly, Stage testing, inspection and testing before supply and
delivery at site, Installation, testing & Commissioning of Ring Main units outdoor type SF6 filled ,
with various combinations of load break isolators & breakers. The scope includes Supply, Erection,
testing and commissioning of outdoor type RMU with necessary take off terminal units for future
automations contains load break isolators, breaker and associated accessories, equipments.
(including earthing- Erection of earthing by using GI strip (minimum 35 mm strip) with earthing
plate including cost of coal/salt to RMU).The Installation of 11KV Outdoor SF6 Insulated RMU
covering erection, testing and commissioning with associated equipment excluding civil work,supply
& laying of 11kv cable,cable jointing kit etc. of RMU. The permission of Electrical inspector for
charging of RMUs is in utility scope. RMU fencing is not in the scope of bidder. Cable termination
kits, cable laying is in utility scope.
The RMUs should be provided with necessary take off terminal units for future automations and all
these units should be shielded in a outdoor metal-body for making them suitable for outdoor use.
The insulation/dielectric media inside the stainless steel welded tank should be SF6 gas. The RMUS
should be Modular ,extensible type on both sides with provision of attaching/connecting with SNAP
FIT arrangement W/o External Busbars additional load break switches and circuit breakers in future
whenever required. However, RMU shall be extensible on both side however left side is occupied by
metering panel and right side is free for extension on vice versa is also possible depending on site
condition. Alternatively Extension shall be possible by adding trunking chambers and required
accessories or by plug-in bushing type arrangement.
The Package scope of work shall include survey, design, manufacture, FAT and delivery, installation
and commissioning of new SCADA enabling equipments of new “SCADA-Ready” .
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The RMU should have compatibility with MODBUS PROTOCOL SCADA system. The RMU shall provide
DI/Dos for interfacing with FRTU. The protection relay shall have MODBUS protocol alongwith DOs.
Ring Main Units capable of being monitored and controlled by the SCADA/DMS.
Where relevant, the RMU scope of work shall be coordinated with the work to be carried out under
the project’s other construction packages & associated materials to the designated destinations as
per this tender specification and Bill of quantities. Includes supply of relevant 11KV cable
termination kits per this tender Specification.
Each RMU shall include its own power supply unit (including auxiliary power transformer,
maintenance free batteries, and battery charger), which shall provide a stable power source for the
RMU. The RMUs will be connected to the FRTU which will be procured, supplied and installed as a
part of Part A of R-APDRP. The RMU shall be supplied with battery charger for charging of 24VDC 48
AH battery set for FRTU.
FRTU, MODEM (Modem Size: 88lx60wx26mm depth), Power and I/O cable interface between FRTU
and Control panel of RMU are excluded in the scope of supply and these items will be provided by
DISCOM/SIA.
Each new RMU shall be equipped with main-line load break switches and a fault passage indicator
(FPI). Furthermore, to protect each of its lateral / transformer feeders, it shall be equipped with a
corresponding set of circuit breakers and relay with auxiliary supply (24V DC) shall be provided. The
RMU shall include potential-free contacts and control contacts so as to connect to SCADA/DMS via
FRTUs, so as to:
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Monitor and control the open/closed status of the RMU circuit breakers and load break
switches.
Monitor the local/remote position of RMU motorised (in case if failure of motor)
manually-operated switches that can be used to enable and disable remote monitoring.
Monitor the health of the power supply, which will include battery failure and low
voltage indications.
Monitor the open/closed status of RMU earthing switches.
Monitor the open/closed status of RMU enclosure doors in case of Hinge doors.
Monitor for low SF6 gas pressure indication.
Monitor for circuit breaker relay operations.
Monitor for indication of main-circuit fault detected by the RMU’s FPI.
Configurations Required:11KV RMU
a) 2-Way , 11KV Gas (SF6) Insulated RMU with One 630A load break switches
and One SF6 Insulated VCB of suitable rating b) 3-way , 11KV ,Gas (SF6) Insulated RMU with 2Nos 630A load break switch
and 1No. SF6 insulated VCB of suitable rating c) 4-way ,11KV Gas (SF6) Insulated RMU with 2Nos 630A Load break switches
and 2Nos , SF6 Insulated VCB of suitable rating –
d) 5-way , 11KV ,Gas (SF6) Insulated RMU with 3Nos 630A load break switch
and 2No. SF6 insulated VCB of suitable rating e) 6-way ,11KV Gas (SF6) Insulated RMU with 3Nos 630A Load break switches
and 3Nos , SF6 Insulated VCB of suitable rating –
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PLS NOTE: THE NOMINAL CURRENT RATING OF VCB SHALL BE ACCORDING TO LOAD OF THE
FEEDER AND ACCORDINGLY SUITABLE RELAY SHALL BE PROVIDED AND ANY CHANGE IN
COMBINATION/CONFIGURATION SHALL BE EXECUTED WITH THE APPROVAL OF CHIEF ENGINEER
OF RESPECTIVE DISCOM.
a.
This Specification provides for design, manufacture, inspection and testing before dispatch,
packing and delivery F.O.R.(Destination) of SF6 insulated RMUs with necessary take off terminal
units for future automations, compatible with SCADA system other accessories and auxiliaries
equipment and mandatory spares, described herein and required for their satisfactory operation.
b.
The objective of the RMUs is for extremely small construction width, compact, maintenance
free, independent of climate, easy installation, operational reliability, Safe and easy to operate,
minimum construction cost, minimum site work and minimum space requirement.
c.
The RMUs shall conform in all respects to high standards Of Engineering design,
workmanship and latest revisions of relevant standards at the time of offer.
d.
The type of the 11 KV circuit breaker shall be VCB and insulating medium for load break
isolators, Earth switch, 11 KV Buses and other associated equipments should be SF6 gas.
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1.3
Necessary current sensors / transformers for protection and metering (wherever
required).
 All necessary dry (potential-free) contacts for indications relevant to RMU monitoring
status and control.
 A PT Panel including auxiliary power transformer for measurement of system voltage
and for charging the batteries.
 Battery and battery charger, to provide stable as per motor rating, 24 VDC, power for
the RMU’s motors.
 Capacitor voltage dividers serving live-line cable indicators.
GENERAL:
The Ring Main Unit shall be installed at 11 KV junction points to have continuous supply by isolating
faulty sections. The RMU shall be extensible on both sides and consists of the following
combinations of load break switches and Circuit breakers for a nominal voltage of 12 KV using SF6
gas as insulating and Vacuum as arc quenching medium.
The RMU and combination shall be tropicalised and outdoor metal enclosed type. The RMU metal
parts shall be of high thickness, high tensile steel which must be grit/short blasted, thermally
sprayed with Zinc alloy, phosphate or should follow the 7 tank pre-treatment process and be
subsequently painted with polyurethane/PP based powder paint. The overall paint layer thickness
shall be not less than 80 microns.
Relevant IE rules for clearances, safety and operation inside the enclosure shall be applicable. The
enclosure shall be IP 54 and type tested for weather proof at EREDA/CPRI.
All live parts except for the cable connections in the cable compartments shall be insulated with SF6
gas. The SF6 gas tank shall be made of robotic or TIG or MIG welded stainless steel, to have the best
weld quality. The gas cubicle shall be metal enclosed with stainless Steel of thickness as per IEC
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tested/ designed so as to provide safety and to avoid leakage of gas and should be provided with a
pressure relief arrangement away from operator.
Both the load break switches and the tee off circuit breaker must be motorized.
The cable box of isolators and circuit breakers both should be of front access type as per site
requirement.
Any accidental over pressure inside the sealed chamber shall be limited by the opening of a
pressure-limiting device in the top or rear-bottom part of the tank or enclosure. Gas will be release
to the rear of the switchboard away from the operator and should be directed towards the bottom,
into the trench to ensure safety of the operating personnel and the pedestrians / civilians. All the
manual operations should be carried out on the front of the switchboard.
GENERAL TECHNICAL REQUIREMENTS
1. Fixed type SF-6 gas insulated / Vacuum circuit breakers. It should be maintenance free, having
stainless steel robotically/ TIG / MIG welded enclosure for IN DOOR / OUTDOOR RMU. However,
offer with high quality of the welding which has necessary extensive leakage test with leak rate of
0.075% per annum can be accepted. The RMUs to be used are only outdoor type.
2. Low gas pressure devices- 1.2 Bar pressure. 1.2 bar pressure of SF6 gas in chamber of RMU is
required.
3. Live cable indicators- High operator safety.
4. Fully Rated integral ear thing switch on each device.
5. Back up relay with auxiliary supply (24V DC) shall be provided
6. Units fully SCADA Compatible. Retrofitting at site possible at a later date. Line switches (Load
break switches) as well as T- OFF circuit Breaker can be operated by remote. ( Manual operations
should be possible in case of motor failure.)
7. For indoor Cable boxes should be front access and interlocked with earth switch. No rear /side
access required. For outdoor RMUs cable boxes shall be on front.
8. Cable testing possible without disconnection of cables.
9. Compact in dimension.
10. Circuit Breaker with back up relay with auxiliary supply (24V DC) shall be provided.
11. Low pressure, sealed for life equipment, can operate at “0” bar pressure.
12. Cable ear thing switch on all switching device-standard, for operator safety.
13. Enclosure with IP 54 standard protection for OUTDOOR RMUs and IP2X for INDOOR RMUs
14. All live parts should be inside a stainless steel enclosure for out door type RMU & minimum 2
mm thickness of stainless steel robotically/TIG/MIG welded enclosure for Outdoor / indoor RMU.
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TECHNICAL AND GUARANTEED PARTICULARS:
The bidders shall furnish all guaranteed technical particulars as called for in Schedule “A” of this
specification. Particulars which are subject to guarantee shall be clearly marked. Bids lacking
information in G.T.P are liable to be rejected
The Entire units or minimum three functions of RMU shall be enclosed in a single compact metal
clad, outdoor enclosure suitable for all weather conditions. The switchgear/steel gas tank shall be
filled with SF6 as per IEC/IS Standards relative pressure to ensure the insulation and breaking
functions. The steel gas tank must be sealed for life and shall meet the “sealed pressure system”
criteria in accordance with the IEC 298 standard. The RMU must be a system for which no handling
of gas is required throughout the 20 years of service life.
The RMU shall have a design such that in the event of an internal arc fault, the operator shall be
safe. This should be in accordance with IEC 298 and relevant Test certificates shall be submitted with
the Tender.
The offered switchgear and control gear should be suitable for continuous operation under the basic
service conditions indicated below. Installation should be in normal indoor conditions in accordance
with IEC 60694.
Ambient temperature – 10 degree C to + 50 degree C
Relative humidity - up to 95%
Altitude of installation - up to 1000m, IEC 60120
1.3.1 The RMU shall be tested for an internal arc rating of 20 kA for 1 Sec. for 11 KV RMU. Suitable
temperature rise test on the RMU shall be carried out & test reports shall be submitted with tender
for technical bid evaluation.
Each switchboard shall be identified by an appropriately sized label, which clearly indicates the
functional units and their electrical characteristics.
The switchgear and switchboard shall be designed so that the position of the different devices is
visible to the operator on the front of the switchboard and operations are visible as well.
The entire system shall be totally encapsulated. There shall be no access to exposed conductors. In
accordance with the standards in effect, the switchboards shall be designed so as to prevent access
to all live parts during operation without the use of tools.
The entire 11 KV RMU are insulated by inert gas (SF6) suitable for operating voltage up to 12 KV
respectively. The 11 KV circuit breakers must be VCB breaker. It is necessary to fit an absorption
material in the tank to absorb the moisture from the SF6 gas. The SF6 insulating medium shall be
constantly monitored via a temperature compensating gas pressure indicator offering a indication at
different temperature ranges, having distinctive RED and GREEN zones for safe operation.
All the RMUs must be routine tested for the following at factory in India: Micro-ohm test(Contact Resistance test) for the assembly inside the tank.
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 Circuit breaker analyzer test so as to ensure the simultaneous closing of all poles for VCB.
 SF6 gas leak test.
 Partial Discharge test on the complete gas tank so as to be assure of the proper insulation
level and high product life.
 High voltages withstand.
 Secondary test to ensure the proper functioning of the live line indicators, fault passage
indicators and relays.
1.3.2 Sulphur Hex fluoride Gas(SF6 GAS)
The SF6 gas shall comply with IEC 376,376A, and 376B and shall be suitable in all respects for use in
11 KV RMUs under the operating conditions. The SF6 shall be tested for purity, dew point air
hydrolysable fluorides and water content as per IEC 376,376A and 376B and test certificate shall be
furnished to the owner indicating all the tests as per IEC 376 for each Lot of SF6 Gas.
DIELECTRIC MEDIUM
SF6 gas/ VCB shall be used for the dielectric medium for 11KV RMUS in accordance with IEC376. It is
preferable to fit an absorption material in the tank to absorb the moisture from the SF6 gas/ VCB
and to regenerate the SF6 gas/ VCB following arc interruption. The SF6 gas / VCB insulating medium
shall be constantly monitored via a temperature compensating gas pressure indicator offering a
simple go, no-go indication.
General structural and mechanical construction:
The offered RMU should be of the fully arc proof metal enclosed, free standing, floor mounting, flush
fronted type, consisting of modules assembled into one or more units. Each unit is made of a cubicle
sealed-for life with SF6 gas / VCB and contains all high voltage components sealed off from the
environment.
The overall design of the indoor switchgear should be such that front access only is required. It
should be possible to erect the switchboard against a substation wall, with HV and LV cables being
terminated and accessible from the front.
The units should be constructed from Minimum 2 mm thick stainless steel sheets. However, Offer
with type test report of pressure withstand test for gas filled compartment with pressure relief
device test as per cl. no. 6-103-1 of IEC 62271-200-2003 can be accepted for 2mm stainless steel
tank thickness. The design of the units should be such that no permanent or harmful distortion
occurs either when being lifted by eyebolts or when moved into position by rollers.
For outdoor RMUs a weather proofing process shall be carried out. SHEET METAL MUST BE GRIT
BLASED / THERMALLY SPRAYED AND POLYURETHANE PAINTED
WITH ABOUT 80 MICRON
THICKNESSES, TO ACHIVE OUTDOOR WORTHINESS AND CORROSION PROOF NESS.
- RMU ENCLOSURE MUST BE SHIELDED AGAINST SOLAR IRRADIATION AND TESTED FOR A
AMBIENT OF 50 DEGREE C WITHOUT DERATING OF THE EQUIPMENT.
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The cubicle shall have a pressure relief device. In the rare case of an internal arc, the high pressure
caused by the arc will release it, and the hot gases is allowed to be exhausted out at the bottom /
top / rear of the cubicle. A controlled direction of flow of the hot gas should be achieved.
The switchgear should have the minimum degree of protection (in accordance with IEC 60529)
- IP 67 for the tank with high voltage components
- IP 2X for the front covers of the mechanism
- IP 3X for the cable connection covers
- IP 54 for the outdoor enclosure.
1.4
STANDARDS:
Unless otherwise specified elsewhere in this Specification, the RMU, Switchboard (Switchgear), Load
break isolators, Instrument Transformers and other associated accessories shall conform to the
latest revisions and amendments thereof to the following standards.
1. IEC 60 298/IEC 62 271-200/IS 12729:1988 - General requirement for Metal Enclosed Switchgear
2. IEC60129/IEC62271-103/IS 9921 - Alternating current disconnector (Load break isolators) and
earthing switch
3. IEC 62 271-100 & 200/IEC 60 056/IS 13118:1991 - Specification for alternating current circuit
breaker
4. IEC 62 271-1/IEC 60694 - Panel design, SF6/Vacuum Circuit Breakers
5. IEC 60044-1/IEC 60185/IS 2705:1992 - Current Transformer
6. IEC 60265-1/IS 9920:1988- High voltage switches.
7. IEC 376 - Filling of SF6 gas in RMU.
8. IEC 60273/IS: 2099 - Dimension of Indoor & Outdoor post insulators i. with voltage > 1000 Volts.
9. IEC 60529/IS 13947(Part-1) - Degree of protection provided by
i. enclosures for low voltage switchgear and
ii. Control gear.
10. Indian Safety Regulations 2010/Relevant IS
Equipment meeting with the requirements of any other authoritative standards, which ensures
equal or better quality than the standard mentioned above as well as latest standard shall also be
acceptable. If the equipments, offered by the Bidder conform to other standards, salient points of
difference between the standards adopted and the specific standards shall be clearly brought out in
relevant schedule. In case of any difference between provisions of these standards and provisions of
this specification, the provisions contained in this specification shall prevail. One copy of such
standards with authentic English Translations shall be furnished along with the offer.(Hard copy)
Applicable Standards

The RMUs shall be manufactured to the highest quality consistent with best practice and
workmanship and in full accord with the Supplier’s quality assurance plan. The RMUs
shall conform to the Indian or IEC international standards that are applicable. These
include the standards listed in
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Table 1 below.
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Table 1: Applicable Standards
Standard
Description
IS 3427
AC metal enclosed switchgear and control gear for rated voltages above 1 kV and up
to and including 52 kV
IS 12063
Classification of degrees of protection provided by enclosures of electrical
equipment
IS 9920
(Parts 1 to 4)
High Voltage Switches
IS 9921
(Parts 1 to 5)
IS 13118
IS 10601
Specification for AC disconnectors and earthing switches for voltages above 1000 V
HV AC Circuit Breakers
Dimensions of terminals of HV Switchgear and Control gear
IS 12729
General requirements of switchgear and control gear for voltages exceeding 1000 V
IEC 1330
IEC 60694
IEC 6081
IS 2705
IS 3156
IS 8686
IEC 62271200
High voltage/Low voltage prefabricated substations
Common clauses for MV switchgear standards
Monitoring and control
Current Transformers
Voltage transformers
Specification for Static Protective Relays
Standards for high voltage metal clad switchgear up to 52 KV.
INDIAN
This is to be as per Central Electricity Authority (Safety Requirement for
ELECTRCIATY
Construction, Operation & Maintenance of Electrical Plants and Electric Lines)
REGULATION
Regulations, 2010
2010
1.5
THE STANDARDS MENTIONED ABOVE ARE AVAILABLE FROM:
IEC - (INTERNATIONAL ELECTRO-TECHNICAL COMMISSION, BUREAU CENTRAL DE LA COMMISSION,
ELECTRO TECHNIQUE INTERNATIONAL, 1, RUE DE VEREMBE, GENEVA, SWITZERLAND.)
ISO - INTERNATIONAL STANDARD ORGANISATION
1.6
SPECIFIC REQUIREMENTS IN RMU:-
1.6.1 CLIMATE CONDITIONS
The climatic conditions under which the equipment should operate satisfactory are as under:
 Maximum ambient air temperature
:50 deg. C
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
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Minimum ambient air temperature
Maximum daily average ambient air temperature
Maximum humidity
Altitude above M.S.L. (maximum)
Average annual rainfall(mm)
Max. wind pressure(Kg/sq.m)
Seismic level(Horizontal accn.)
Iso-ceraunic level(Days per Year)
Average thunder storm days per annum
:10 deg.C
:45 deg C
:100%
:1000 metres
:925
:200
:0.3 g
:50
:50
1.6.2 Distribution Network Electrical Parameters
The main parameters of the distribution network are as follows:
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1.7
Rated Voltage
Nominal system voltage:
Highest system voltage:
Number of phases:
Frequency:
Variation in frequency:
Type of earthing:
Power frequency withstand voltage:
Basic impulse withstand voltage :
12 KV
11 kV (rms)
12 kV (rms)
3
50 Hz
48.5 Hz to 51.5 Hz
Solid
28 kV
95 kV
RMU OUTDOOR METAL CLAD ENCLOSURE.
The RMU enclosure must be a metallic, it shall follows an industrialized process of manufacturing.
The RMU and combination shall be tropicalised and outdoor metal enclosed type. The RMU metal
parts shall be of high thickness, high tensile steel which must be grit/short blasted, thermally
sprayed with Zinc alloy, phosphate or should follow the 7 tank pre-treatment process and be
subsequently painted with polyurethane based powder paint. The overall paint layer thickness shall
be not less than 80 microns.
The rating of enclosure shall be suitable for operation on three phase, three wire, 11 KV, 50 cycles,
A.C. System with short-time current rating of 20KA for 3 seconds for 11 KV with RMU Panels.
The enclosure should have two access doors one for the operation and relay monitoring and other
for the cable access. Both the doors should have the locking facility to prevent the access to
operating mechanism to avoid unauthorized operating of RMU and relay.
RMU Design Features
All design features of the proposed RMU, as described in the supplier’s bid and in the bid’s reference
materials, shall be fully supported by the equipment actually delivered. The key design features
include those that relate to:
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Maintainability, expandability, and life span
Ability to operate in severe outdoor environmental conditions.
Immunity to electrical stress and disturbance.
Acceptable insulation properties.
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Convenient FRTU interconnection features.
INDOOR RMU
1. MODULAR DESIGN, PANEL TYPE WITH FRONT CABLE ACCESS.
2. RMU MUST BE MADE OF ROBOTICALLY / TIG / MIG WELDED STAINLESS STEEL.
3. Offered RMU must be extensible.
OUT DOOR RMU
1. Stainless steel enclosure for OUT DOOR RMU application. The manufacturers shall conform
the normal current ratings mentioned in GTP at 50 deg. Ambient without derating or as per
IEC Standard
2. Enclosure with I.P.54 standard protection.
3. Offered RMU must be extensible.
4. Cable boxes shall be on Front sides.
5. RMU ENCLOSURE MUST BE SHIELDED AGAINST SOLAR IRRADIATION AND TESTED FOR
AMBIENT OF 50 DEGREE C. The manufacturers shall conform the normal current ratings
mentioned in GTP at 50 deg. Ambient without derating, however, design for higher ambient
temperature than 50 degree may be admissible.
1.8
TAKE OFF TERMINAL UNITS FOR AUTOMATION:
The RMU shall be provided with necessary take off terminal units for automations, located in the
front recesses / LV cubical of the RMU. The connectivity to the FRTU for SCADA purpose shall be
provided. Refer Annexure-1 for general arrangement of the termainals.
1.9
ISOLATORS (LOAD BREAK TYPE)
The load break isolators for Incoming and Outgoing supply must be provided. These should be fully
insulated by SF6 gas. The load break isolators shall consist of 630 Amp fault making/load breaking
spring assisted ring switches, each with integral fault making earth switches. The switch shall be
naturally interlocked to prevent the main and earth switch being switched “ON at the same time.
The selection of the main and earth switch is made by a lever on the facia, which is allowed to move
only if the main or earth switch is in the off position. The load break isolators should have the facility
for remote operation. Each load break switch shall be of the triple pole, simultaneously operated,
automatic type with quick break contacts and with integral earthing arrangement.
The isolating distance between the OFF and the ON position in the isolator should be sufficient to
withstand dielectric test as per IS/IEC, so as to have enough isolating distance for ensuring safety
during DC injection for Cable testing.
Load break switch should have the following
 Motor operated 12 KV, 630A Load Break switch and manually operated Earthing Switch with
making capacity.
 “Live Cable” LED Indicators thru Capacitor Voltage Dividers mounted on the bushings.
 Mechanical ON/OFF/EARTH Indication
 Anti-reflex operating handle
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 Cable Testing facility without disconnecting the cable terminations, cable joints and terminal
protectors on the bushings.
Cable terminations
 Cable boxes suitable for 1 X 3C x 300 sq mm XLPE Cable with right angle Cable Termination
Protectors.
1.10 EARTHING
OF
ISOLATORS
AND
BREAKERS
(EARTH
SWITCH)
Necessary arrangements are provided at Load break isolators Breaker for selecting Earth
position. Mechanical interlocking systems shall prevent the RMU function from being operated from
the “ON” to “Earth On” position without going through the “OFF” position.
1.11 DISTRIBUTION
TRANSFORMER/FEEDER
BREAKER
(VACUUM)
The VCB breaker for the controlling of DT/Feeder Breaker must be provided inside welded
stainless steel SF6 gas tank with the outdoor metal clad enclosure. The VCB circuit breaker must be a
spring assisted three positions with integral fault making earth switch. The selection of the
main/earth switch lever on the facia, which is allowed to move only if the main or earth switches is
in the off position.
The manual operation of the circuit breaker shall not have an effect on the trip spring. This should
only be discharged under a fault (electrical) trip; the following manual reset operation should
recharge the trip spring and reset the circuit breaker mechanism in the main off position.
The circuit breaker shall be fitted with a mechanical flag, which shall operate in the event of a fault
(electrical) trip occurring. The “tripped” flag should be an unambiguous colour differing from any
other flag or mimic.
Both the circuit breaker and ring switches are operated by the same unidirectional handle.
The protection on the circuit breaker shall comprise of the following components:5P10 class protection CTs,
low burden trip coil and
O/C & E/F relay with auxiliary supply (24V DC) shall be provided
IDMT protection relays (Numeric/Micro processor based) 3 x over current and earth fault element
shall be Definite Time type relay . The relay should be housed within a pilot cable box accessible.
Circuit Breaker should have the following:
- Motor operated 200 A / 630A SF6 insulated Vacuum circuit breaker and Ear thing Switch with
making capacity 51KA
- Mechanical tripped on fault indicator
- Auxiliary contacts 4NO and 4NC
- Anti-reflex operating handle
- “Live Cable” LED Indicators through Capacitor Voltage Dividers mounted on the bushings.
- O/C + E/F relay with auxiliary supply (24V DC) shall be provided.
- Shunt Trip circuit for external trip signal
- Mechanical ON/OFF/EARTH Indication
- Cable boxes suitable for 1 X 3C x 300 sq mm XLPE Cable with right angle Cable Termination /
protectors / boots
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TECHNICAL DATA
1
Ring Main Unit, Electrical data
Electrical data and service conditions
Rated voltage
KV
12
1
Power frequency withstand voltage
KV
28
2
Impulse withstand voltage
KVp
95
3
Rated frequency
Hz
50
4
Rated current busbars
A
630
5
Rated current (cable switch)
A
630
6
Rated current (T-off)
A
630
Breaking capacities:
7
active load
A
630
8
closed loop (cable switch)
A
630
9
off load cable charging (cable switch)
A
135
10
earth fault (cable switch)
A
200
11
earth fault cable charging (cable switch)
115
12
short circuit breaking current (T-off circuit kA
breaker)
20 / 21
13
Rated making capacity
kA
52
14
Rated short time current 3 sec.
kA
20 / 21
Ambient temperature:
15
Maximum value
°C
+ 50
16
Maximum value of 24 hour mean
°C
+ 40
17
Minimum value
°C
0
18
Altitude for erection above sea level4
m
...1000
19
Relative humidity
Max 95%
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2
Ring Main Unit Technical data (11KV)
No. General data, enclosure and dimensions
1 Standard to which Switchgear complies
IEC
Metal Enclosed, Panel type, Compact
Module.
3
Yes
2
Type of Ring Main Unit
3
Number of phases
4
Whether RMU is type tested
5
6
Whether facility is provided with pressure relief
Insulating gas
Yes
SF6
7
Nominal operating gas pressure
1.4 bar @ 20° C. However offer with
Nominal operating gas pressure shall be as
per manufacturer standard and suitable to
satisfy the rated dielectric strength can be
accepted
8
9
Gas leakage rate / annum
Expected operating lifetime
10
Whether facilities are provided for gas monitoring
11
Material used in tank construction
No.
1
2
3
4
5
6
7
8
9
Operations, degree of protection and colours
Means of switch operation
Means circuit breaker operation
Rated operating sequence of Circuit Breaker
Total opening time of Circuit Breaker
Closing time of Circuit Breaker
Mechanical operations of switch (co)
Mechanical operations of CO earthing switch
Mechanical operations of circuit breaker (co)
Principle switch / earth switch
Degree of protection:
High Voltage live parts, SF6 / VCB tank
Front cover mechanism
Cable covers
Outdoor Enclosure
Colours:
Front cover
Side and cable cover
10
11
12
13
14
15
1.12
0.075%
30 years
Yes, temperature compensated manometer
can be delivered
Stainless steel sheet, minimum 2 mm
separate handle
separate handle and push buttons
O - 3min-CO-3min-CO
approx. 45ms
approx. 40ms
1000
1000
2000
3 position combined switch / earth switch
IP 67
IP 2X
IP 3X
IP 54
BUSHINGS
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The units are fitted with the standardized bushings that comply with IEC standards. All the bushings
are the same height from the ground and are protected by a cable cover.
1.13
CABLE BOXES
All the cable boxes shall be air insulated suitable for dry type cable terminations and should have
front access. The cable boxes at each of the two ring switches should be suitable for accepting HV
cables of sizes 3c x 300 sq.mm and circuit breaker cable suitable up to 3c x 300 sq.mm. The cable
boxes for an isolator in its standard design should have sufficient space for connecting two cables
per phase .Necessary Right angle Boot should be supplied to the cable terminations .The type of the
Right angle Boot should be cold applied insulating Boot.
1.14
CABLE TESTING FACILITY
It shall be possible to test the cable after opening the cable boxes. The cable boxes should open only
after operation of the earth switch. Thus ensuring the earthing of the cables prior to performing the
cable testing with DC injection.
1.15
VOLTAGE INDICATOR LAMPS AND PHASE COMPARATORS
The RMU shall be equipped with a voltage indication to indicate whether or not there is voltage on
the cable. There should be a facility to check the synchronization of phases with the use of external
device. It shall be possible for the each of the function of the RMU to be equipped with a permanent
voltage indication as per IEC 601958 to indicate whether or not there is voltage on the cables.
1.16
EXTENSIBLE
Each combination of RMU shall have the provision for extension both sides by load break isolators /
breakers in future, with suitable accessories and necessary Bus Bar. The equipment shall be well
designed to provide any kind of extension / trunking chamber for connecting and housing extensible
Busbars. Extensible isolators and circuit breakers shall be individually housed in separate SF6 gas
enclosures. Multiple devices inside single gas tank / enclosure will not be acceptable. In case of
extensible circuit breakers, the Breaker should be capable of necessary short circuit operations as
per IEC at 20 KA, and the Breaker should have a rated current carrying
capacity of 630 A.
1.17
WIRING & TERMINALS:
The wiring should be of high standard and should be able to withstand the tropical weather
conditions. All the wiring and terminals (including take off terminals for future automation, DC,
Control wiring), 20% Spare terminals shall be provided by the contractor. The wiring cable must be
standard single-core non-sheathed, Core marking (ferrules), stripped with non-notching tools and
fitted with end sleeves, marked in accordance with the circuit diagram with printed adhesive
marking strips.
The wiring should be of high standard and should be able to withstand the tropical weather
conditions. All wiring shall be provided with single core multi-strand copper conductor wires with
P.V.C insulation.
The wiring shall be carried out using multi-strand copper conductor super flexible PVC insulated
wires of 1100V Grade for AC Power, DC Control and CT circuits. Suitable colored wires shall be used
for phase identification and interlocking type ferrules shall be provided at both ends of the wires for
wire identification. Terminal should be suitably protected to eliminate sulphating. Connections and
terminal should be able to withstand vibrations. The terminal blocks should be stud type for controls
and disconnecting link type terminals for CT leads with suitable spring washer and lock nuts.
14 | P a g e
Flexible wires shall be used for wiring of devices on moving parts such as swinging Panels (Switch
Gear) or panel doors. Panel wiring shall be securely supported, neatly arranged readily accessible
and connected to equipment terminals, terminal blocks and wiring gutters. The cables shall be
uniformly bunched and tied by means of PVC belts and carried in a PVC carrying trough.
The position of PVC carrying trough and wires should not give any hindrance for fixing or removing
relay casing, switches etc., Wire termination shall be made with solder less crimping type of tinned
copper lugs. Core identification plastic ferrules marked to correspond with panel wiring diagram
shall be fitted with both ends of each wire. Ferrules shall fit tightly on the wire when disconnected.
The wire number shown on the wiring shall be in accordance with the IS.375.
All wires directly connected to trip circuits of breaker or devices shall be distinguished by addition of
a red color unlettered ferrule.
Inter-connections to adjacent Panels (Switch Gear) shall be brought out to a separate set of Terminal
blocks located near the slots or holes to be provided at the top portion of the panel. Arrangements
shall be made for easy connections to adjacent Panels (Switch Gear) at site and wires for this
purpose shall be provided and bunched inside the panel. The bus wire shall run at the top of the
panel.
Terminal block with isolating links should be provided for bus wire. At least 20% of total terminals
shall be provided as spare for further connections. Wiring shall be done for all the contacts available
in the relay and other equipment and brought out to the terminal blocks for spare contacts. Color
code for wiring is preferable in the following colours.





Voltage circuits :
CT circuits
:
DC circuits
:
250V AC circuits :
Earthing
:
Red, Yellow, Blue for phase and Black for Neutral
similar to the above
Grey for both positive and negative
Black for both phase and neutral
Green
The wiring shall be in accordance to the wiring diagram for proper functioning of the connected
equipment. Terminal blocks shall not be less than 1100V grade and shall be piece-molded type with
insulation barriers.
The terminal shall hold the wires in the tight position by bolts and nuts with lock washers. The
terminal blocks shall be arranged in vertical formation at an inclined angle with sufficient space
between terminal blocks for easy wiring.
The terminals are to be marked with the terminal number in accordance with the circuit diagram
and terminal diagram. The terminals should not have any function designation and are of the tension
spring and plug-in type.
Clear empty Space shall be mandatorily provided in RMU Panel for mounting FRTU Panel.
Dimensions details of required space for FRTU are about 1200 mm H x 600 mm W x 300 mm D.
Normal FRTU load for DCPS will be minimum 25 watts to 80 watts.230V AC Supply for charging of
FRTU battery should be available. The Aux supply will be taken through the PT provided for metering
in RMU. We require 24V DC. FRTU will require power up to 200 VA depending upon RMU
configuration. The PT must have sufficient burden for meeting the aforesaid requirement also for
battery charging. The separate transformer must have sufficient capacity for meeting the aforesaid
requirement also for battery charging.
1.18
EARTHING
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The RMU outdoor metal clad, Switch Gear, Load break isolators, Vacuum circuit breakers shall be
equipped with an earth bus securely fixed along the base of the RMU.
The size of the earth bus shall be made of IEC/IS standards with tinned copper flat for RMU and
M.S.Flat for Distribution Transformer, earth spike and neutral earthing. Necessary terminal clamps
and connectors shall be included in the scope of supply.
All metal parts of the switchgear which do not belong to main circuit and which can collect electric
charges causing dangerous effect shall be connected to the earthing conductor made of copper
having CS area of minimum 75 sq.mm. Each end of conductor shall be terminated by M
10/equivalent quality and type of terminal for connection to earth system installation. Earth
conductor location shall not obstruct access to cable terminations.
The following items are to be connected to the main earth conductor by rigid or copper conductors
having a minimum cross section of 75 mm (a) earthing switches (b) Cable sheath or screen (c)
capacitors used in voltage control devices, if any.
The metallic cases of the relays, instruments and other panel mounted Equipment s shall be
connected to the earth bus by independent copper wires of size shall be made of IEC/IS standards.
The colour code of earthing wire shall be green. Earthing wires shall be connected on the terminals
with suitable clamp connectors and soldering shall not be permitted.
Two no. of earthing with connecting G.I Strip (size=35mm*3mm) are to be provided as per attached
Drawing(Appendix-2) with ref IS:3043-1987(2006).
1.19
ACCESSORIES & SPARES:
The following spares and accessories shall be supplied along with the main equipments at free of
costs. This shall not be included in the price schedule.
1. Charging lever for operating load break isolators & circuit breaker of each RMU.
2. The pressure gauges indications - 1 numbers
Provision shall be made for padlocking the load break switches/ Circuit breaker, and the earthing
switches in either open or closed position with lock & master key.
1.20
TESTING OF EQUIPMENT & ACCESSORIES:
Provision for testing CTs,PTs, Relays, Breakers and Cables shall be made available. Procedure and
schedule for Periodical & Annual testings of equipments, relays, etc. shall be provided by the
supplier.
1.20.1 TYPE TEST
The Tenderers should, along with the tender documents, submit copies of all Type test certificate of
their make including breaker and Isolators in full shape as confirming to relevant ISS/IEC of latest
issue obtained from a International/National Govt. Lab/Recognized laboratory.
The above type test certificates should accompany the drawings for the materials duly signed by the
institution who has type test certificate.
1.20.2 ACCEPTANCE AND ROUTINE TESTS
All acceptance and routine tests as stipulated in the latest IEC- shall be carried out by the supplier in
the presence of DISCOM’s representative. The supplier shall give at least 7 days advance intimation
16 | P a g e
to the DISCOM to enable them to depute their representative for witnessing the tests. The partial
discharge shall be carried out as routine test on each and every completely assembled RMU gas tank
and not on a sample basis. As this test checks and guarantees for the high insulation level and thus
the complete life of switchgear.
1.20.3 ADDITIONAL TESTS
The DISCOM reserves the right for carrying out any other tests of a reasonable nature at the works
of the supplier/laboratory or at any other recognized laboratory/research institute in addition to the
above mentioned type, acceptance and routine tests at the cost of the Board to satisfy that the
material complies with the intent of this specification.
1.20.4 PRE-COMMISSIONING TESTS
All the pre-commissioning tests will be carried out in the presence of the DISCOM’s testing engineer
and necessary drawing manual and periodical test tools shall be arranged to be supplied.
During the above tests the contractor representative should be present till the RMUs are put in to
service.
1.21
INSPECTION:
The inspection may be carried out by the DISCOM at any stage of manufacture. The supplier shall
grant free access to DISCOM’s representative at a reasonable time when the work is in progress.
Inspection and acceptance of any equipment under this specification by the DISCOM shall not relieve
the supplier of his obligation of furnishing equipment in accordance with the specification and shall
not prevent subsequent rejection if the equipment is found to be defective.
The supplier shall keep the DISCOM informed in advance, about the manufacturing programme so
that arrangement can be made for inspection. The DISCOM reserves the right to insist for witnessing
the acceptance/routine testing of the bought out items. The DISCOM has rights to inspect the
supplier’s premises for each and every consignment for type & routine test.
No material shall be dispatched from its point of manufacture unless the material has been
satisfactorily inspected and tested / unless the same is waived by the DISCOM in writing.
QUALITY ASSURANCE PLAN:
The bidder shall invariably furnish following information along with his offer / in case of event of
order.
I. Statement giving list of important raw materials including but not limited to
a) Contact material
b) Insulation
c) Sealing material
d) Contactor, limit switches, etc. in control cabinet.
Name of sub-suppliers for the raw materials, list of standards according to which the raw materials
are tested, list of test normally carried out on raw materials in presence of Bidder’s representative,
copies of test certificates.
II. Information and copies of test certificates as in (I) above in respect of bought out accessories &
raw materials.
17 | P a g e
III. List of areas in manufacturing process, where stage inspections are to be carried out.
IV. Normally carried out for quality control and details of such tests and inspections.
V. Special features provided in the equipment to make it maintenance free.
VI. List of testing equipment available with the Bidder for final testing of RMUs and associated
combinations vis-à-vis the type, special, acceptance and routine tests specified in the relevant
standards. These limitations shall be very clearly brought out in the relevant schedule i.e. schedule
of deviations from specified test requirements. The supplier shall, within 15days from the date of
receipt of Purchase Order submit following information to the DISCOM.
a) List of raw materials as well bought out accessories and the names of sub-suppliers selected from
those furnished along with offer.
b) Necessary test certificates of the raw material and bought out accessories.
c) Quality Assurance Plan (QAP) with hold points for DISCOM’s inspection. The quality assurance plan
and hold points shall be discussed between the DISCOM and supplier before the QAP is finalized.
The supplier shall submit the routine test certificates of bought out items and raw material, at the
time of routine testing of the fully assembled breaker.
1.22
TRAINING:
The supplier shall give rigorous training to the engineers & staff for 2 days in attending trouble
shooting and maintenance.
1.23
SCADA CONNECTIVITY:
Provision shall be made in all the RMUs with necessary take off terminal units for automations and
connectivity with FRTU. The all RMUs shall be motorized type and compatible for SCADA operation.
All the I/O signals need to be brought to the Terminal Strip on a Din Rail, also the Din Rail should
have space to mount the MFT’s provided by SIA. Size of MFT is 96H X 96W X 117D mm. All the DI’s,
AI’s and DO’s should be provided as potential free and control contacts. The CT/PT should provide
metering grade core for connecting MFT provided with FRTU. The RMU will also supply 230VAC 200
VA for FRTU. Battery for FRTU supplied by SIA.
The RMU should be provided with provision of following minimum signals available at separate
SCADA terminal box.
Minimum signals for SCADA/DMS - to be wired
to Separate TBs
CB close / open
potential free contacts
LBS close / open
LBS & CB Earth Switch close /open
Spring charge Status indication
SF6 gas pressure low
O/C Operated
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E/F Operated
Local/Remote
Common Power Supply Healthy
Motor MCB Healthy Status
Battery charger Fail
1.24
RMU Door Open
CB Trip Coil Healthy
CT & PT
For SCADA Metering
FPI Control
FPI remote resetting for SCADA
CB control
Control from SCADA
LBS Control
Control from SCADA
DOCUMENTATION and DRAWINGS
All drawings shall conform to relevant International Standards Organization (ISO) Specification. All
drawings shall be in ink and suitable for microfilming.
The tenderer shall submit along with his tender dimensional general arrangement drawings of the
equipments, illustrative and descriptive literature in triplicate for various items in the RMUs which
are all essentially required for future automation.
I.
Schematic diagram of the RMU panel
II.
Instruction manuals
III.
Catalogues of spares recommended with drawing to indicate each items of spares
IV.
List of spares and special tools recommended by the supplier.
V.
Copies of Type Test Certificates as per latest IS/IEC.
VI.
Drawings of equipments, relays, control wiring circuit, etc.
VII.
Foundation drawings of RMU so that Utility will planned and carry out civil works etc.
VIII.
Dimensional drawings of each material used for item VII.
IX.
Actual single line diagram of RMU/RMUs with or without Extra combinations shall be made
displayed on the front portion of the RMU so as to carry out the operations easily.
The following should be supplied to each consignee circle/town along with the initial supply of the
equipments ordered.
19 | P a g e
a. Copies of printed and bound volumes of operation, maintenance and erection manuals in
English along with the copies of approved drawings and type test reports etc.
b. Sets of the manuals as above shall be supplied to the Chief Engineer/Distribution. A soft
copy of the all Technical and Drawing furnished in a CD
1.25
NAME PLATE:
Each RMU and its associated equipments shall be provided with a nameplate legible and indelibly
marked with at least the following information.
a. Name of manufacturer
b. Type, design and serial number
c. Rated voltage and current
d. Rated frequency
e. Rated symmetrical breaking capacity
f. Rated making capacity
g. Rated short time current and its duration
h. Purchase Order number and date
i. Month and Year of supply
j. Last date of completion of Guarantee period
k. Rated lightening impulse withstand voltage
l. Feeder name (Incoming and Outgoing), DTs Structure name, 11000 Volts Dangers etc.
j Name of DISCOM
NOTE:
I)
II)
1.26
THE WORD RATED NEED NOT APPEAR ON THE NAME PLATE. RECOGNIZED
ABBREVIATIONS MAY BE USED TO EXPRESS THE ABOVE PARTICULARS.
WHETHER THE CIRCUIT BREAKER IS FITTED WITH CLOSING/TRIPPING DEVICES
NECESSITATING AN AUXILIARY SUPPLY SHALL BE STATED EITHER ON THE CIRCUIT
BREAKER NAME PLATE OR ANY OTHER ACCEPTABLE POSITION.
FAULT PASSAGE INDICATORS (FPI):
These shall facilitate quick detection of faulty section of line. The fault
indication may be on the basis of monitoring fault current flow through the device.
The unit should be self-contained requiring no auxiliary power supply. The FPI shall
be integral part of RMU. The FPI shall have LCD/LED display, automatic reset
facility. FPI Reset from SCADA will be through momentary closure of a potential free contact from
FRTU.
The sensors to be bushing/cable mounted. The number of FPI should be put in all the three phases
of the outgoing branch of the RMUs
FPI should have suitable connectivity with the FRTUs for the SCADA purpose.
20 | P a g e
The FPI inside the RMU may be non communicable and hard wired to the TB for the signals
Fault Passage indicator OK
Fault Passage indicator operated
The conventional practice is to have (N-1) FPI where N is nos. of LBS in a particular configuration of
RMU i.e. following for tendered RMUs:
2WAY
3WAY
4WAY
5WAY
6WAY
1.27
-
NIL
1
1
2
2
TROPICALISATION
Due regard should be given to the climatic conditions under which the equipment is to work.
Ambient temperatures normally vary between 20 deg C and 40 deg C, although direct sun
temperature may reach 45 deg C. The climate is humid and rapid variations occur, relative humidity
between 60% and 95% being frequently recorded, but these values generally correspond to the
lower ambient temperatures. The equipment should also be designed to prevent ingress of vermin,
accidental contact with live parts and to minimize the ingress of dust and dirt. The use of materials
which may be liable to attack by termites and other insects should be avoided.
1.28
Motorization :
All the functions within the RMU i.e Isolators/Breakers should be fitted with motor mechanism and
closing coil making it suitable to make it on from remote.( However, manual mechanism should be
possible in case of failure/ non working of motor)
Other Accessories (required with RMU) :a) Shunt Trip Coil ( Coil voltage shall be indicated later on)
b) Battery & Battery Charger.
c) 4NO+4NC auxiliary contacts.
1.29
Metering:
Multifunction Energy meter shall be provided by DISCOMS with, of accuracy class of
0.5
at
incoming isolator of all RMUs. The Metering CTs and PTs of suitable rating shall be
provided and wired in SCADA terminal TBs. Metering and protection is required on Breaker only and
not on Isolator. CTs may consider accordingly.
1.30
TECHNICAL SPECIFICATION FOR RMU
1.30.1 11KV Bus Bar
I.
II.
III.
IV.
Current Carrying Capacity
Short time rating current for 3 secs.
Insulation of bus bar
Bus bar connections
: 630 Amps.
: 20 KA for 11kv
: SF6
: Anti-oxide grease
1.31
PARAMETERS FOR SWITCH GEAR OF DT AND LOAD BREAK ISOLATORS
I.
II.
III.
Type
No of Phases
No. of poles
: Metal enclosed
:3
:3
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IV.
Rated voltage
:12 KV
V.
Operating voltage
:11 KV(+10% to -20%)
VI.
Rated lightning impulse withstand voltage
:95 KV
VII.
Rated power frequency withstand voltage
:28 KV
VIII.
Insulating gas
:SF6
IX.
Rated filling level for insulation
:As Per IEC.
Max.permissible site altitude at the above gas pressures
: 1000m
(The operating pressure has to be adjusted for greater altitudes)
Isolating distance between ON and OFF position in isolator
:80 mm (min).
Rated short time current
:20 KA.for 11kv
Rated short time
:3s
Rated peak withstand current
:50 KA.
No of operations in Short circuit
:15Nos (minimum)
Operating mechanism: Circuit breaker with spring assisted anti reflex mechanism.
Rated current (Bus):
:630 A
Rated current (breaker)
:200 A
Circuit Breaker interrupter
:SF6 insulated VCB
Rated frequency
: 50 Hz
Rated operating sequence
:O-3min- CO
Number of mechanical/Remote operations for earthing : As per IEC
& Ring switches & Number of mechanical/ Remote operations for circuit breakers 60298
1.32
PRINCIPAL FEATURES
Sr. DESCRIPTION
No
Breaker
1
2
3
4
5
Circuit label
Mimic diagram
Supply voltage indication
Current Transformer
IDMT O/C & E/F Numerical/Microprocessor relay
with auxiliary supply (24V DC) shall be provided.
Yes
Yes
Yes
Yes
Yes
6
7
Anti - Reflexing Handle
Interlock to defeat the operation of the line side
earthing when the line side isolator is ON.
Yes
Yes
8
Interlock to defeat the operation of the earthing
when the breaker is in service position and is ON.
Yes
9
10
Breaker ON/OFF indication
Spring Charge indication / Spring assisted
mechanism.
Yes
Yes
11
12
13
Fault Tripping indication
Bus bar end caps
Whether the SF6 gas pressure gauge indicator and
filling arrangement.
Yes
Yes
Yes
14
Whether the spring assisted mechanism with
operating handle for ON/OFF.
Yes
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15
Whether the earth positions with arrangement for
padlocking in each position and independent
manual operation with mechanically operated
indicator are provided
Yes
16
RMUs are provided with necessary take off
terminals for future automation.
Yes
1.33
Earthing switch for 11 KV Line side Isolation and DT
Rated short time current
: 20 KA.for 11kv.
Rated short time
:3s
Rated peak withstand current :50 KA
Interlocking facility:
1) Between 11 KV Line side isolator “ON”&Earthing.
2) Between 11 KV DT side breaker on close condition &earthing
1.34
CT Type
Current Transformers for breaker
: Tape wound
CT Description : The CTs of breaker shall be Suitable for sensing the minimum primary variable
current in the order of 100-200 A and the secondary current for the CT is 1 A. The CT shall be housed
in outside SF6 chamber for testing and Maintenance . CT Ratio for protection CT is 100-200/1-1 A,
class 0.5/5p10 & PT Ratio is 6.35 KV/63.5 V, class-0.5, Burden – 10 VA
Accuracy Class CT
:0.5/5P10
Rated burden : 15 VA.
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Guaranteed Technical Particulars for Extensible SF6
Unit(Mandatory To be submitted by Bidder)
S.No.
A
1 Service
2 Type
3 Number of phases
4 Voltage
5 Rated Frequency
6 Rated Current
7 Short Circuit rating
Breaking (breaker)
8 Short time withstand 3S
Fault making
9 Insulation Level
10 System earthing
Particulars /Units
insulated Ring
Main
To be specified by Bidder
B Vacuum or SF6 Circuit Breaker
1 Type
2 Rated Voltage
3 Breaking Current
4 Making Current
5 Rupturing Capacity
6 Rated Current
7 No. of Poles
8 Operating mechanism
9 Breaker Operating Time
i) Break Time msec.
ii) Make Time msec.
iii) No. of Operations
a) At full load current
b) At Fault Current
C Isolators
1 Type
2 Duty cycle
3 Rated current
4 Rated breaking capacity
5 Fault making capacity
6 Rupturing Capacity
7 No. of poles
8 Operating mechanism
9 SF6 tank
10 Interlocks
24 | P a g e
11 Operation safety
D Busbars:
1 Material
2 Type
3 Rated Current
4 Short time rating for 3 Sec.
E Cable Boxes
Air Termination
F Current Transformer
1 C.T. Ratio
2 Over current factor
3 Class of accuracy
4 Rated Burden
G Configuration(Left to Right facing front of Ring Main Unit)
H Protection
1 Three phase over current and Earth Fault
I Size of RMUs( L X W X D )(for civil works etc –under Utility scope)
2.
3.
4.
5.
6.
2 WAY
3 WAY
4 WAY
5WAY
6 WAY
SIGNATURE OF TENDERER
NAME:
DESIGNATION:
Add more sheets if required.
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ITEM-B TECHNICAL SPECIFICATIONS FOR 11kV FAULT PASSAGE
INDICATOR (FPI) with DCU
1.1 SCOPE:
Supply of overhead Fault Passage Indicators (FPI) for over head lines to be installed on 11 KV lines.
The objective of this remote communicable FPI is to quickly identification of the faulty circuit and
automatic update to the SCADA control center over remote communication. Fault Passage Indicators
clipped on the overhead lines. One such device shall be clipped on each phase so that to measure
current and Voltage presence in this phase and compute fault detection algorithm accordingly. A
short-range radio interface shall be embedded in this Fault Passage Indicator so that to allow it
communicate with the Data Concentrator interface This specification applies to a system allowing to
remotely monitor appearance of faults on an Overhead High Voltage network so that to localise
faulty sections and send patrols for reconfiguration of the network accordingly.
The system shall be made of:
- Fault detection systems with wireless communication to be installed on Medium Voltage Overhead
Electric networks, as specified in this document.
- ONE application software is to be installed on a PC in the control centre so that to display the
information from these Fault passage indicators. This shall be referred to as Fault Monitoring
software. This software with registry address & stored data shall be readable integrating with 104
SCADA.
Alternatively the information through IEC-104 protocol from all FPIs to be integrated with
SCADA/DMS under implementation in coordination with SIA.
The network connection & modem required for communication between DCU to the control center
is under the scope of SIA.
1.2 PURPOSE:
To locate the exact passage of faults on overhead lines. The FPI shall indicate both transient as well
as permanent faults on the O/H lines .
The Fault Passage Indicators shall be designed to be clipped on the Overhead MV line. 3 Fault
Passage Indicators shall be clipped on one line, one on each phase. It shall include the following
functions:
- Measurement of current running in the phase it is clipped on
26 | P a g e
- Detection of Voltage absence/presence on the phase it is clipped on
- From the 2 previous functions, detection of phase-to-phase and phase-to-earth faults
- Short-range radio communication with a Data Concentrator interface at a minimum distance of
100m at least.
It shall be self-supplied from a non-rechargeable battery of a minimum life time 8 years, in the
temperature conditions specified in this specification, including at least 1 short range radio
communication with the Data Concentrator interface.
The Fault Passage Indicators shall be suitable for outdoor use in the tropical climate condition
stipulated in the relevant paragraph. The components used in the Fault Passage Indicators shall be
suitably protected from direct sunlight to prevent malfunctioning due to solar radiation. The
maximum operating temperature shall not be less than 70° C. The Fault Passage Indicators shall be
suitable for mounting on live line conductors of a diameter ranging between 5 and 25 mm, with
clamps designed so that the Fault Passage Indicator can withstand winds of 150km/h without falling
from the line. The Fault Passage Indicator shall be fully self-contained type without any external
connection, indicator or sensors. The Fault Passage Indicators shall be suitable for use on multiple
lines supported by the same pole.
Wireless communication Fault detection systems
General information
System parameters
The Fault detection systems shall be designed to operate on a Medium Voltage overhead network
with the following characteristics:
- Nominal Operation Voltage 7 to 13 kV
- Frequency
50 Hz
- Type of MV neutral earthing: through a resistor or solidly grounded
- Conductor diameter 5 to 25 mm
One single product shall be proposed to cover the whole range of above characteristics: Particularly,
the same product should be installed on any network from 7 to 13 kV.
1.3 OPERATION:
The Fault Passage Indicator shall operate on either passing over of the absolute threshold current
(user settable) or the current variation (di/dt).
Upon the installation of the indicator, the FPI shall adjust itself to the network frequency and voltage
of perform required function.
Operational specifications
Fault detection
Fault detection shall be performed by the Fault Passage Indicator described above. Fault sensing
shall be made from current measurement and Voltage presence detection, based on detection of
the electromagnetic field and its variations.
The Fault Passage Indicator shall be of the programmable type, suitable for sensing:
- Short-circuit faults, Low earth leakage faults (referred to as “unbalance”) phase-to-phase faults
27 | P a g e
Phase-to-earth faults
Event time-stamping
Any change of state of information shall generate a time-stamped event stored in the Data
Concentrator memory. The event storage capacity shall be at least 100 events.
1.4 FAULT TYPES:
The FPI shall detect and indicate both earth faults as well as phase to phase faults. In addition to this,
the FPI shall also detect and indicate transient and permanent faults.
1.4.1 INRUSH RESTRAINT:
The FPI shall be equipped to filter out the inrush current due to transformer magnetizing currents
thus avoiding the possible false indication of faults.
1.4.2 RESET:
Once the fault is cleared, the FPI shall reset itself upon the power return, it shall also have a facility
of resetting with settable time duration and the remote reset.
1.5 TRANSIENT FAULT EVOLUTION:
If FPI is busy in flashing on transient fault and if the permanent fault occurs, the FPI shall
automatically change the priority and shall start flashing differently to show the permanent fault;
thus helping maintenance crew to review the priorities.
Salient Technical Features of FPI
Offered 11 kV Clip-on / Pole mounting, Remotely monitored ,Outdoor unit Fault Passage Indicator
(FPI) should have compatibility with OPEN PROTOCOL SCADA system.
1. It should operate on either passing over of the absolute threshold current (user settable) or
the current variation(di /dt)
2. It should adjust itself to the network frequency and voltage to perform required function.
3. It should detect and indicate both earth faults as well as phase to phase faults
4. It should also detect and indicate transient and permanent fault
5. It should be equipped to filter out the inrush current due to transformer magnetizing
currents thus avoiding the possible false indication of faults
6. Once the fault is cleared, the FPI shall reset itself upon the power return. It shall also have a
facility of resetting with settable time duration and the manual reset
7. If FPI is busy in flashing on transient fault and if the permanent fault occurs, the FPI shall
automatically change the priority and shall start flashing differently to show the permanent
fault; thus helping maintenance crew to review the priorities
8. The lithium battery provided inside the FPI should be trouble free of 10 years life and
replaceable type, in the case of battery failures and
9. The FPI should have some self-test possibility usable when the FI is on the line (powered or
not)
10. Installation of FPI should be possible on live lines using an isolated hot stick with shot gun
type termination
11. It should support communication system SNMP, Master station(s) using 60870-5104protocol, protocol over 3G/GPRS , and forming IPSec VPN based security.
28 | P a g e
12. Short range radio communication with a Data concentrator interface at a minimum distance
of 100m at least.
13. Monitored information configurable as “alarming” shall include at least the following,
consisting both of HV network diagnostic information and monitoring equipment internal
faults for self-diagnostic purpose:
- Fault detection appearance with indication of Fault Passage Indicator reporting the fault
and tripping criteria tripped.
- Fault detection disappearance with indication of Fault Passage Indicator reporting the fault
and tripping criteria tripped clear.
- Voltage absence
- Voltage presence
- Change of state of a digital input
- Fault Passage Indicator absent (failure of the Data concentrator interface to communicate
with it through short range radio)
- Fault Passage Indicator battery low
Configuration and maintenance
Equipment configuration and diagnostic shall be performed by connection of a laptop PC to the Data
Concentrator using the PC RS232 interface.
Configuration shall include:
a. Scanning of all Fault Passage Indicators in the short range radio range (at least 100m) and
assigning of an identification (typically number) to each of them, so that to allow identification of
line (when Data Concentrator is monitoring more than 3 Fault Passage Indicators) and phase on the
line on which each Fault Passage Indicator is clipped-on, in order to allow identification by the
control centre of line and phase where faults or voltage absence are detected.
b. Configuration of fault detection thresholds and other characteristics.
c. Configuration of communication: PIN code, telephone numbers (control centre and mobile for
sending SMS messages), transmission speed, etc…
d. Configuration of alarms, as explained above
Diagnostic shall include at least display of the current value of all information monitored (Fault
Passage indicators list and status, Fault indications (phase-to-phase and phase-to-earth) from Fault
Passage indicators, digital inputs, measurements….) and an embedded protocol analyser showing
frames received and sent.
1.6 DCU for FPI:
The DCU should be a low power consumption unit to be used as a gateway to link the communicable
FPI to the SCADA application. This DCU unit should be mounted on an overhead line pole close to FPI
installed in the 11kV distribution network.
Fault Passage Indicators clipped on the overhead lines. One such device shall be clipped on each
phase so that to measure current and Voltage presence in this phase and compute fault detection
algorithm accordingly. A short-range radio interface shall be embedded in this Fault Passage
Indicator so that to allow it communicate with the Data Concentrator interface mentioned below.
29 | P a g e
-A Data Concentrator interface, pole-mounted, acting as a communication gateway between Fault
Passage Indicators using short-range radio and the remote control centre using 3G/GPRS
communication.
Data Concentrator Interface Unit(DCU)
The Data Concentrator interface shall be designed to be mounted on a wooden, concrete or metallic
pole. It shall be able to interface up to 9 Fault Passage Indicators installed in a 100m minimum range
at least, corresponding to up to 3 overhead lines.
This box shall include the following functions:
- Short range radio Interface to up to 9 Fault Passage Indicators in a 100m range.
- External 3G/CDMA/GPRS Modem (will provided Utility/SIA) connected to Serial port/RJ 45 of the
Data concentrator.
- Communication protocol to the control centre shall be Modbus over TCP/IP or IEC 870-5-101 or IEC
870-5-104
- Configuration of the Data Concentrator (3G /GPRS communication, definition of alarms…) and Fault
Passage Indicators (Fault detection thresholds…) by connection of a laptop running the configuration
software to an RS232 interface on the communication interface. The same software shall also
include full diagnostic capabilities. It should be possible to configure these parameters from remote
control centre over the 3G /GPRS network. Suitably power supply with battery backup arrangement
for data concentrator and 3G/GPRS MODEM shall be done by the supplier. If power supply is not
integral part Data concentrator same needs to be quoted separately. The Battery shall have a
warranty of atleast 3 years & replaceable. Low battery alarm shall be provided at remote location.
The battery backup duration for the DCU to run without AC supply is minimum 4hrs.
The DCU should enable the communication, one side with the FPI units, via a spread spectrum
license-free radio frequency with low power consumption and the other side with the distant
acquisition system through a long range communication medium over mobile telephone network
(3G/GPRS) others via the local RS232 port. The DCU should be capable of forming IPsec VPN
connectivity.
1.6.1 Basic Functions
The DCU should be able to store the date and time stamping of all events from communicable FPI
and send all requested events to the SCADA application. This DCU should have the facility to change
the FPI setting over remote operation. This DCU should have the memory capacity to store last 100
stamped events.
1.6.2 Description
The DCU should be available in a Pole-mounted enclosure, able to house a battery and a battery
charger, with external AC supply .
The main board includes:


A short range low power spread spectrum radio for communication with the FPI
For long range communication:
30 | P a g e



One communication medium with its embedded modem (3G/GPRS) or o one RS232 port for
external communication.
One RS232 local parameter setting port
6 digital inputs, for alarm information to SCADA application
3 digital dry contact outputs set to repeat phase faults (phase A, B, or C) from FPI or short
range communication faults or battery faults for transmission by an external DCU.
1.6.3 Detail Characteristics
Sr. Details
No.
Specific Requirement
1
2
3
4
5
6
7
Spread spectrum low power licence-free
Free Band allowed in India
FCC part 15.249 and AS/NZS 4268:2003 approved radio.
Embedded 3G/ GPRS modem
DNP3, IEC 870-5-101/104
I(min), I(max), I(mean) and I(inst)
9 phases
9
Type
Frequency
RF output
Communication media
Communication protocol
Type
Number of HV lines monitored
per DCU
mechanical Large enclosure
Small box Cabinet
Earth fault indication
10
Phase fault or Imax
b Phase fault indication (phase A, B, or C), (beginning time,
ending time)
11
Transient fault detection if
enabled
Voltage loss indication
Transient fault indication and time stamping
8
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
Equipment monitoring
Local radio communication
faulty
FPI battery alarm
DCU U battery alarm
AC supply alarm
Inputs
Outputs
Local archive of Date and time
stamped events and measures
Downloading of local archive
Power supply
Operating temperature
Storage temperature
Mechanical Large enclosure
Small box Cabinet
Dimensions in cm
Net weight in kg
100 m
(phase A, B, or C), (beginning time, ending time)
Voltage loss indication (phase A, B, or C) and time stamping
and Voltage recovery time indication
Equipment monitoring
Communication with FPI Nos. XX faulty (after a number of
attempts) and time stamping
Battery low in FPI no.x and time stamping
Battery low in DCU and time stamping
AC supply alarm External AC supply off
6 digital inputs
3 relay outputs 220 Vac/1 A
100 events
Remote via SCADA application
In built Battery of suitable rating
-25°C to +70°C
-40°C to +85°C
Mechanical Large enclosure Small box Cabinet
430x330x200
8 kg
31 | P a g e
28
29
30
31
32
Protection level
Standards
Vibrations and shocks test
EMI/EFI immunity
Salt spray and humidity tests
IP 54
Standards
IEC 68-2-6 and 68-2-29
IEC 801-3 and FCC Part 15
IEC 68-2-11 and 68-2-30
TECHNICAL DATA for FPI
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
25
26
27
28
Nominal operation Voltage
Power Frequency
Conductor diameter
MV neutral arrangement
Fault Detection Parameters
Di trigger setting
Current setting trigger value
Transient fault detection
Flash duration (user settable)
Inrush transient duration
Loss of voltage condition
Fault confirmation
Reset (Permanent Faults)
Automatic power return reset
Timer reset
Manual reset
Fault Indication
Indication
Light power
Visible angle
Standard total flash duration
Battery
Environment
Operating temperature
Storage temperature
Protection level
Test
7 TO 13 kV
50 Hz
5 to 25 mm
Independent / Solidly earthed
Short circuit withstand
Dielectric test
Site Condition
Ambient Temperature
Relative humidity
Average annual rainfall
Altitude
25 KA / 170 ms
125 KV
6-12-25-60-90-120-160A-Off
100-200-500-800A
On / Off facility required
2-4-8-16 hours
3 Sec
U < 45% Un
Voltage drop within 70s after fault detection
U > 70% Un during 70S
4-16 hours
By magnet
Red flash light
40 Lumens
360 deg.
400-800 hours
Lithium with life > 10 years
0 to +85 deg. C
0 to +85 deg. C
IP 54 IK7
0-50 deg C
10-100%
750 mm
300 m Max
32 | P a g e
29
30
31
32
33
Wind pressure
Technical description
Rated operating voltage
Rated frequency
Trip current
Fault current minimum duration
195Kg/m2 upto 30m
11 kV
50 Hz
30-500A
50 ms
CODES AND STANDARDS:The equipment proposed to be designed, manufactured and tested in compliance with the latest
version of IEC Standards.
Electro-magnetic compatibility
IEC-61000-6-2 and FCC part 15
IP65 Protection level
IEC-60529
Damp Heat cycle Test (Humidity & Heat cycle ) IEC-68-2-30
Salty fog
IEC-68-2-11
Sinus wave vibration & Shocks
IEC-68-2-6 , IEC-68-2-29
Dielectric Test
IEC 60060-1
Temperature aging
IEC-68-2-14
Short circuit
ANSI 495 (part 4.4.8)
EMI / EFI immunity
IEC -801
Device Enclosure
IP 65
SCADA compatibility of FPIs: The FPI should be provided with provision of necessary terminal blocks which shall be used for
connecting the DCUs for automations as mentioned in below table:
O/C operated
Potential free contact
E/F operated
Fault passage indicator OK
Command for reset FPI
1.7Additional requirements –
1.7.1 For FPIs there shall be four types of resetting facility
a) Self reset after set reset time
b) Self reset time after restoration of voltage
c) Manual
d) Remote resetting from SCADA control centre
33 | P a g e
1.7.2 Radio Frequency connectivity shall carry the data between the FPIs and the base control unit (DCU).
1.7.3 FPI should be able to communicate to remote SCADA system using standard protocols like
modbus/IEC-103 over long range communication medium (GPRS/CDMA)
1.7.4 It should be able to generate Digital Indications to be sent to remote location SCADA system.
Simultaneously, it should have Digital Output facility to execute the resetting commands from SCADA/
Local point along with the timer based self resetting feature.
Marking
Each Fault Passage Indicator shall carry a weather and corrosion proof plate indicating the following
particulars.
- Manufacturer’s identification.
- Model or type number (as per catalogue)
- Year of manufacture in characters big enough to allow reading from the ground so that to provide
indication of battery age.
- Last date of completion of Guarantee period
1.8 Environmental specifications
1.8.1 Mechanical resistance to vibration and shocks
1.8.2 The equipment shall have vibration resistance in accordance with
1.8.3 IEC 60068.2.6: 10 to 500 Hz; 0.7 mm peak to peak from 10 to 59Hz and 5g from 59 to 500 Hz.
1.8.4 IEC 60068.2.27: 40g / 6 ms / 2000 positive and 2000 negative shocks in each direction, in the
three directions.
1.9 Dielectric withstand
IEC 61010 Insulation (50 Hz/1 min.): 2 kV
EN 60-950 Impulse wave (1.2/50 µs): 5 kV/IEC Equivalent
2.0 Electromagnetic compatibility
Electrostatic discharge IEC 1000-4-2 Level 3
Radiated fields IEC 1000-4-3 Level 3
Radio frequency IEC 1000-4-6 Level 3
Magnetic immunity, 50 Hz, IEC 1000-4-8 Level 4
Emissions EN 55011 Class A/IEC Equivalent
2.1 Environment
Operating temperature: -25°C to +70°C
Storage temperature: -40°C to +85°C
Humidity: 95% at 40°C
2.2 Documentation
Each device shall be supplied with a user manual for installation and commissioning on site.
TRAINING:

The supplier shall give rigorous training to the engineers & staff for 3 days for 8 persons in
attending trouble shooting and maintenance at owners premise in the field after successful
installation. Training should be at free of cost
34 | P a g e
Guaranteed Technical Particulars for OVERHEAD
INDICATOR(Mandatory To be submitted by Bidder):
S.No. DESCRIPTION
A Application
1 Type
2 Distribution Network
Voltage
3 Power Frequency
4 Short – circuit withstand
5 HV Neutral arrangement
6 Diameter
7 License Free Radio Frequency
B
Fault detection
parameters
8 Current setting Trigger value
9 Transient faults detection
10 Minimum impulse time
11 Beacon Flash Indication
Duration (user settable)
12 Inrush transient restraint
C Reset (Permanent Fault)
13 Automatic Power Return
14 Timer Reset
15 Manual Reset
D Fault indication
16 Indication
17 Light Power
18 Visibility Angle Degree
19 Flash Period for permanent
Faults
20Flash Period for transient
Faults
21Standard total flash
Duration
E Power Supply
22 Battery
23 Life of the Battery Years
F Environment
24 Operation Temperature
25 Storage Temperature
26 Protection Level
G Mechanical
27 Wind Resistance
28 Weight
29 Dimensions
Units
FAULT
PASSAGE
To be specified by Bidder
KV
Hz
kA/ms
As per the Bidder
A
M sec
Min
Sec
A
Min
Lumens
Sec
Sec
Hrs
Deg C
Deg C
Kg/sq.mm.
Kg
Mtr
H DCU
30 Event storage capacity
Events
35 | P a g e
31 Dimensions
32 Net Weight
33 Battery back up duration to run
Without AC supply
cm
kg
Hrs
SIGNATURE OF TENDERER
NAME:
DESIGNATION:
Add more sheets if required
ANNEXURE 1
FRTU requirements with respect to RMU
A. Introduction:
The purpose of the document is to specify FRTU requirements with respect to RMU equipment. The
requirements can be broadly specified as;
1. Space for mounting FRTU.
2. Mounting holes.
3. ‘SCADA Interface’ module.
4. 24V DC 200VA auxiliary power source with earthing point.
All these are to be provided in RMU Cabinet/Panel.
B. Mounting requirements:
For the purpose of safety and compactness it is required that FRTU be mounted in RMU cabinet so,
suitable mounting space for FRTU to be provided inside cabinet. The size of FRTU and typical
arrangement of FRTU is as shown in Appendix-1.
Since the FRTU will be mounted inside the panel, mounting holes are to be provided. The mounting hol es
can be provided on a mounting plate or any other suitable arrangement. The details of mounting holes are
shown in Appendix-1.
C. Connectivity requirements:
The connectivity of signals between FRTU and RMU is required to be hardwired instead of serial
communication.
Since connectivity of FRTU with the RMU will be hardwired signals, all the I/O signals required for SCADA
are to be terminated on the ‘SCADA Interface’ module.
36 | P a g e

TENDER NO:MGVCL/RAPDRP/SCADA/222A ITEM- A: TECHNICAL SPECIFICATION FOR OUTDOOR 11 KV RING

Transcription

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