MANUAL 34-1334 DMN Circuit-Breaker: Reyrolle,

Transcription

MANUAL
Document Classification: Controlled Disclosure
Title:
Distribution Task Manual – Part 11:
Unique Identifier:
34-1334
Circuit-Breaker: Reyrolle,
Document Type:
DMN
Type: 66 OSM 10 / 66 OSM 10 – X1,
Revision:
0
Rating: 66kV; 1600A,
Published date:
MARCH 2009
Mechanism: Hydraulic
Total pages:
23
Review date:
MARCH 2014
COMPILED BY
APPROVED BY
FUNCTIONAL RESP
AUTHORISED BY
_ _ _ _ _ _ __
L Leroux / A Feuth
_ _ _ _ _ _ __
A PERSADH
_ _ _ _ _ _ __
C D Smith
_ _ _ _ _ _ __
MN BAILEY
Compilers
Switchgear Care
Chairperson
for TESCOD
CMDT for MD (Dx)
DATE:20/02/2009
DATE:20/02/2009
DATE:20/02/2009
DATE:27/02/2009
WG
Content
Page
Foreword............................................................................................................................................... 2
Introduction ........................................................................................................................................... 3
1
Scope ........................................................................................................................................... 4
1.1.....Purpose............................................................................................................................ 4
1.2.....Applicability ...................................................................................................................... 4
2
Normative/Informative References............................................................................................... 4
2.1.....Normative......................................................................................................................... 4
2.2.....Informative. ...................................................................................................................... 4
3
Definitions And Abbreviations ...................................................................................................... 5
4
Requirements ............................................................................................................................... 5
4.1.....Roles and Responsibilities............................................................................................... 5
4.2.....First and second line maintenance .................................................................................. 5
4.3.....Specialist maintenance .................................................................................................... 6
4.4.....Modifications .................................................................................................................... 16
5
Tests............................................................................................................................................. 16
6
Related/Supporting Documents ................................................................................................... 17
6.1.....Related Documents ......................................................................................................... 17
6.2.....Forms and Records ......................................................................................................... 17
7
Spares .......................................................................................................................................... 17
Annex A - Circuit-breaker report........................................................................................................... 18
Annex B-Impact assessment................................................................................................................ 20
JF Scholtz / Mar 2009 Rev 0
DOCUMENT CLASSIFICATION: CONTROLLED DISCLOSURE
Type: 66 OSM 10 / 66 OSM 10 – X1,
Unique Identifier:
Type:
Revision:
Page:
34-1334
DMN
0
2 of 23
Foreword
The document was compiled to comply with OHSAct requirements and to document the tasks
procedure in maintaining REYROLLE BREAKER type OSM10 to ensure that maintenance tasks are
carried out in a safe manner.
REYROLLE BREAKER TYPE OSM10
Revision information
This revision cancels and replaces documents SCSINAAD9 or DISINAAD9.
Date
SEP 1999
OCT 2003
Rev. no.
0
1
Clause
-
Remarks
Compiled By: DM Ntombela
Original issues as SCSINAAD9
Revised By: DM Ntombela
Original issues as SCSINAAD9
2
3
4.1
-
DEC 2007
0
2
3
-
Format changed
Normative references updated
Definitions and abbreviation updated.
Responsibilities updated.
Re-numbered all the titles, included more photos and
added more information.
Included Revision information
Included impact assessment form as an annexure.
Reviewed By: DM Ntombela
Document issued as DMN_34-1334
The template / format and ref. number changed
Normative references updated;
Definitions and abbreviation updated;
Re-numbered all the titles and added more information;
Included Revision History information;
When downloaded from the IARC WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorised version on the WEB.
Unique Identifier:
Type:
Revision:
Page:
Type: 66 OSM 10 / 66 OSM 10 – X1,
Date
Rev. no.
MAR 2009
0
Clause
6
-
34-1334
DMN
0
3 of 23
Remarks
Included impact assessment form; and
Reference number changed to DMN_34-1334
Related/Supporting Documents
Document approved as DMN_34-1334
Authorisation
This document has been seen and accepted by:
Name
Designation
MN Bailey
Corporate Manager Divisional Technology
C Smith
TESCOD
A Persadh
Switchgear Care WG Chairman
L Leroux / A Feuth
Compilers
Development team
This Task Manual was previously prepared by:
AM Jacobs
C Troskie
CD Smith
D Ntombela
E Mutloane
H van der Westhuizen
HZ Strzalkowski
JF Richter
JG Kruger
JH Coetzer
JJ van Coller
T Stoffberg
This Task Manual was revised by:
David M Ntombela;
Jack Wilson;
Sarel Bouwer;
Jack Ramoroka;
Anton Feuth;
Louis LeRoux; and
Enos Mandavha.
Introduction
The Task Manual has replaced the Work Instructions within the Distribution Division. This has been
done to assist the end users of these documents and the following is important to note:
•
The contents of a Task Manual are always linked to the requirements of one or more Job Plans.
In many instances only selected paragraphs / sections of the Task Manual will apply to a
specific Job Plan.
•
Task Manuals also form the main content of the training module for the task and therefore only
people who have attended the training and assessed as competent should be assigned the task
as described in the Task Manual.
This Task Manual is the revision of the document that was initially compiled and titled CIRCUITBREAKER: REYROLLE, TYPE: 66 OSM 10 / 66 OSM 10 – X1, RATING: 66kV; 1600A, MECHANISM:
SPRING/HYDRAULIC to formalize the procedures of performing tasks when carrying maintenance
tasks out. The document includes the latest updates in information, format, safety precautions and
diagrams / photos to make the document more user-friendly.
Type: 66 OSM 10 / 66 OSM 10 – X1,
Unique Identifier:
Type:
Revision:
Page:
34-1334
DMN
0
4 of 23
Key words
Moving contacts, Fixed contacts, External mechanism, Mechanism, Adjustments, Testing.
Bibliography
Not applicable.
1
Scope
1.1
Purpose
The purpose of this Task Manual is to standardise maintenance instructions on CIRCUIT-BREAKER:
REYROLLE, TYPE: 66 OSM 10 / 66 OSM 10 – X1, RATING: 66kV; 1600A, MECHANISM:
SPRING/HYDRAULIC.
1.2
Applicability
This Task Manual is applicable to Eskom Distribution Division and the contractors employed by the
Unit.
2
Normative/Informative References
Parties using this document shall apply the most recent edition of the documents listed below:
2.1
Normative
Occupational Health and Safety Act and Regulations (OHSAct).
NRS079-1: Mineral Insulating Oils.
ESKASABT0 (EST_32-332): Rev. 0, Oil spill clean-up and rehabilitation.
ESKPVAEY6: Rev. 0, Operating Regulations for High Voltage Systems.
DISASAAT8 (DST_34-1710): Rev. 4, Provision and use of Personal protective equipment.
SCSPBAAY2 (DPL_34-1005): Rev. 0, Environmental management policy.
SCSASAAX4 (DST_34-1451): Rev. 2, Standard for the maintenance of circuit-breakers and oil
immersed isolators.
DPC_34-444: Rev. 0, Procedure for the application and maintenance of portable earth’s.
SCSPVABF4 (DPC_34-908): Rev. 0, Procedure for Barricading.
DPC_34-227: Rev. 0, Pre-Task Planning and feedback process.
Manufacturers manual.
2.2
Informative.
SCSPVABE0 (DST_34-04): Rev 3, Procedure For The Preparation And Administration Of Distribution
Standards.
Type: 66 OSM 10 / 66 OSM 10 – X1,
3
Unique Identifier:
Type:
Revision:
Page:
34-1334
DMN
0
5 of 23
Definitions And Abbreviations
All definitions and abbreviations in ESKPVAEY6 and OHSAct 85 of 1993 are applicable.
4
Requirements
4.1
Roles and Responsibilities
4.1.1
Plant Managers shall be responsible for:
a)
Ensuring that equipment job plans are available and issued for specific maintenance.
b) Ensuring that the maintenance feedback information / data is captured and recorded into the
system for future maintenance planning.
4.1.2
Each Field Services Manager shall be responsible for:
a) Ensuring that staff carrying out maintenance tasks is trained, competent and authorized to
perform maintenance on the specific equipment;
b) Ensuring that instructions are implemented and adhered to and equipment is maintained in
accordance to relevant Task Manuals.
4.2
First and second line maintenance
a) Insulators shall be inspected for chips and breakages. A maximum of 20 % of chipped or broken
sheds is permitted on an insulator. Chips or breaks shall be painted with approved varnish at the
earliest opportunity.
b) Pollution levels on insulators shall be monitored. An anti-pollution medium shall be applied in
accordance with local requirements.
c) There shall be no insulating and hydraulic oil leaks. If any leaks are found these shall only be
repaired by authorized personnel.
d) All oil levels shall be correct in circuit-breaker poles, pole dampers, mechanism dampers,
mechanism gearboxes and hydraulic mechanisms. There shall be maximum and minimum level marks
on all gauge glasses.
e)
All gauge glasses shall be clear and legible.
f)
All hydraulic pressures shall be correct. There shall be maximum and minimum pressure marks
on all gauges.
g) Mechanism boxes shall be clean and dust free. Checks shall be made for any general or obvious
defects.
h)
Mechanism box door and cover seals shall be intact.
i)
Mechanism heaters shall be operational. If a thermostat is fitted the cut-out shall be set at
approximately 25 C.
j)
k)
The operating label shall be securely mounted and shall be legible from the operating position.
All metal work shall be checked for corrosion or rust.
Type: 66 OSM 10 / 66 OSM 10 – X1,
l)
Unique Identifier:
Type:
Revision:
Page:
34-1334
DMN
0
6 of 23
The earth straps shall be in a good condition and effectively connected.
m) All feeder advances shall be recorded as fault trips or operations.
NOTE: All defects found are to be reported to the Work Management Centre with the work order feedback.
4.3
Specialist maintenance
4.3.1
Pre-planning
4.3.1.1
Materials
a)
1 x fixed contact assembly per phase;
b)
1 x moving contact tip per phase;
c)
1 x transfer contact assembly;
d)
15 x transfer contact springs;
e)
1 turbulator complete assembly;
f)
1 x arcing contact ring per phase;
g)
1 x set gauge glass gaskets (rubber / neoprene gaskets = 3mm) per phase;
h)
1 x gauge glass (113.5 mm long);
i)
1 x bottom “O” ring;
j)
1 x drain valve gasket;
k)
1 x Explosion vent gasket;
l)
1 x drain valve plugs;
m) 1 x hood / lid gasket (4 mm thick) per phase;
n)
1 x drum certified oil;
o)
1 x empty oil drum;
p)
1 x litre hydraulic fluid;
q)
1 x sheet of scotch brite;
r)
1 x Brasso;
s)
2 x kg. lint free cloth; and
t)
5 x litres approved electrical cleaner (only approved electrical cleaner: quick dry solvent).
4.3.1.2
Tools and equipment
a) Scaffolding/ladders;
b) Portable oil pump with hoses and fittings;
Type: 66 OSM 10 / 66 OSM 10 – X1,
Unique Identifier:
Type:
Revision:
Page:
34-1334
DMN
0
7 of 23
c) Cleaning tray;
d) Standard set of tools;
e) Adapter for drain valve;
f)
Hand pump for manually charging spring;
g) Spanner for contact tip replacement;
h) Contact tip guide plate;
i)
Gauge holder for checking height of moving contact;
j)
Gauge for checking height of moving contact stem;
k) Contact assembling tool;
l)
Finger contact replacement tool;
m) Oil gauge replacement spanner;
n) Manual control lever for slow operation;
o) Fitting sleeve for gaco oil seals;
p) Speed recorder;
q) Ductor tester;
r)
Insulation tester (5kV); and
s) Grease gun.
4.3.1.3
Personal protective equipment
All personal protective equipment shall be in accordance with DISASAAT8.
a) Overall;
b) Hard hat;
c) Safety boots;
d) Fall Arrest System; and
e) Gloves.
Unique Identifier:
Type:
Revision:
Page:
Type: 66 OSM 10 / 66 OSM 10 – X1,
4.3.2
34-1334
DMN
0
8 of 23
Safety and Preparation
a)
Carry out a risk assessment in terms of procedure 34-227.
b)
Isolate and earth panel in accordance with ESKPVAEY6.
c)
Erect barricading in accordance with SCSPVABF4.
d)
Erect scaffolding (where required).
e) Ensure all tools, equipment and materials are placed inside the barricaded area where they will
not hinder or obstruct any worker.
f)
Manually close and open the circuit-breaker from the mechanism box to discharge springs.
g)
Isolate the D.C. supply to the panel to prevent accidental closing or tripping of the circuit-breaker.
h) To release the tension from closing spring push the “Push to close” knob and check the circuitbreaker indication to show “Breaker closed” and “Closing Spring Discharged”.
i)
Then open the circuit-breaker by pushing “Push to Trip” knob and ensure that the breaker
indicates “Open and Tripping Springs Discharged”.
j)
Environmental hazards shall be removed in accordance with ESKASABT0 and SCSPBAAY2.
4.3.3
Maintenance
Risk assessment and critical task analysis shall be done in accordance to DWN_34-227 and approved
safe work procedures before the commencement of work.
4.3.3.1
Opening the circuit-breaker
a) Before commencing with any maintenance close the circuit-breaker, carry out contact resistance
and timing tests, and record for reference (contact resistance of <115µΩ, opening time 20ms-55ms
and closing time 110ms-150ms).
b)
Open the circuit-breaker and ensure charging ram is free.
c) Remove all fuses and/or links in the closing, tripping and indicating supply circuits, and also those
in the pump motor circuit.
d) Undo and remove the circuit-breaker top lid/cover securing nuts/screws, use a special spanner to
loosen the exhaust valve cover and remove the lid from the pole (see figure 1).
Figure 1
e) Remove the plug from the drain valves on the lower terminal assembly, screw the adapter into
the exposed threaded hole (see figure 2).
Unique Identifier:
Type:
Revision:
Page:
Type: 66 OSM 10 / 66 OSM 10 – X1,
34-1334
DMN
0
9 of 23
f)
Remove the sealing cap from the dirty oil branch of the adapter, attach the oil hose, screw in the
centre-rod of the adapter and drain the oil into the dirty oil drum (see figure 2).
Figure 2
g)
To close the valve when draining is complete, unscrew the centre rod.
h)
Remove the lid seal/gasket, remove the exhaust valve cover and check vent hole to be clear.
i)
Fit new seal /gasket on the exhaust valve cover and fit the cover onto the pole lid.
j)
Remove the gauge glass by loosening and removing the gauge glass securing lock-nut and
remove the washers, the gauge glass and the gaskets.
NOTE: Ensure that the gauge glass is 113.5 mm long and the rubber washer is 3 mm thick before assembling the gauge
glass assembly.
k) Inspect the gauge glass for chips and cracks and if it is in good condition clean it with approved
cleaner and scourer and dry it with lint free cloth (see figure 3).
Figure 3
4.3.3.2
Fixed contact
a) Undo 4 clamping plate nuts securing the turbulator in place from within the explosion chamber,
(the clamping plate will lift due to the tension of the springs until it clears the dowel pin) then rotate the
fixed contact/arc quenching device / turbulator assembly 90o
b) Remove the turbulator / fixed contact assembly from the explosion chamber and lower to ground
level, place into the cleaning tray for maintenance (see figure 4).
Figure 4
Unique Identifier:
Type:
Revision:
Page:
Type: 66 OSM 10 / 66 OSM 10 – X1,
34-1334
DMN
0
10 of 23
c) Disassemble the fixed contact assembly from the arc-quenching device by loosening and
removing the contact assembly securing Allen screws.
d) Remove the fixed contact assembly from the arc quenching device by removing 4 Allen key bolts
and place it in a clean cleaning tray for maintenance (see figure 5).
Figure 5
e) Inspect the arcing ring and the contact fingers for burn marks and pitting, should they be severely
damaged replace them with new ones (see figure 6).
f)
To dis-assemble the assembly:

clamp the fixed contact mounting / base assembly into the vice.

turn the arcing ring loose and remove it.
lock a contact replacement special tool onto the contact fingers housing and turn
anticlockwise to remove the housing and the support tube from the mounting base (see figure 6).
Figure 6
g) With a contact replacement tool clamped over the supporting tube clamp the contact assembly in
the vice and turn the contact finger housing anti-clockwise.
Unique Identifier:
Type:
Revision:
Page:
Type: 66 OSM 10 / 66 OSM 10 – X1,
34-1334
DMN
0
11 of 23
h) Remove the housing from the support tube and remove the contact fingers from the housing (see
photos in the manual).
i)
Inspect the contact fingers and the housing for burn marks and pittings, should the contact be
severely damaged replace them with new ones.
j)
Clean the contacts with electrical cleaner and scourer (see figure 7)
Figure 7
k) If the whole contact assembly is badly burnt then the complete unit shall be replaced with a new
one and reassemble the fixed contact assembly in reverse order.
4.3.3.3
Arc control device (Turbulator)
a) Loosen and remove the 6 Allen screws securing the turbulator holder and the clamping ring
assembly and remove the clamping ring assembly from the arc-quenching / turbulator device.
b) Remove the turbulator holder from the turbulator sleeve, secure the turbulator discs segments
and turn the turbulator sleeve upside down.
c) Place the turbulator sleeve on a flat surface, lift and remove the sleeve to expose the
discs/segments.
d) Number all the segments before disturbing the order of arrangement, disassemble and clean all
segments with clean oil and dry them with a lint free cloth.
e)
Inspect the turbulator discs for burn marks, cracks, tracking, deformation or any abnormalities.
f)
Measure the diameter of two top segments and if the diameter is more than 23.5 mm replace the
segments with new ones, the diameter of the new segments is 20,5 mm.
g)
Re-assemble the arc-quenching device / turbulator in reverse order.
4.3.3.4
Moving contact
a) Slow close the circuit-breaker, inspect the moving contact to be free from pitting and burn marks if
severely damaged replace it with a new one.
b) Measure the wear on the contact tip, if the contact has worn down by 3 mm, replace the contact
tip (see figure 8).
Unique Identifier:
Type:
Revision:
Page:
Type: 66 OSM 10 / 66 OSM 10 – X1,
34-1334
DMN
0
12 of 23
Figure 8
NOTE: The guide plate shall be used when removing and refitting the moving contact tip to avoid bending the
moving contact rod.
c) To remove the contact tip, install the special tool guiding plate onto the expansion chamber, fit the
special contact tip removing tool over the contact tip, tighten handle 1 over the contact tip, turn the
handle 2 anti-clockwise and remove the contact tip (see figure 9).
1
2
Figure 9
NOTE: Ensure that the new contact tip, the nylon locking device is inserted in the hole provided.
d) Remove the worn contact tip from the special tool, fit the new contact tip into the chuck of the
special tool and tighten the handle clockwise to grip the contact tip.
e) Insert the tool through the guide plate, screw and tighten the contact tip onto the moving contact
rod by turning the handle 2 clockwise.
f)
Turn handle 1 anti-clockwise to release the tool from the contact tip, remove the special tool from
the chamber, and remove the guide plate from the chamber (refer to figure 9).
4.3.3.5
External mechanism
Not applicable.
4.3.3.6
Mechanism
a) Ensure that all springs are discharged before commencing any work on the mechanism by
checking the indications OFF and UNCHARGED on the mechanism (see figure 10).
Figure 10
Unique Identifier:
Type:
Revision:
Page:
Type: 66 OSM 10 / 66 OSM 10 – X1,
34-1334
DMN
0
13 of 23
NOTE: Where crank casing / drive shafts flanges leaks oil ensure that the oil is drained from the poles and the contacts
and in the closed position before dismantling the crank casing to replace the seals.
b)
Inspect the crank casing flanges / drive shafts for insulation oil leaks, to replace the seals:
Ensure that the DC supply is switched OFF and slow close the circuit-breaker (see figure 11
& 14).
Figure 11
For the left outer phase remove the interphasing link securing circlip and pivot pin (see figure
12).

Ensure that the position of the assembly in relation to the drive shaft is marked.

Remove the dowel pin securing the tripping spring assembly onto the contact drive shaft.
Dowel
pin
Figure 12
Remove the 8 x 4mm Allen key bolts and use two dummy bolts to push the flange / drive shaft
out from crank casing, remove the drive shaft totally and remove the flange from the drive shaft
(see figure 13).
Circlips
securing the
interphasing
links onto the
middle phase
Allen screws securing
the drive shaft flanges –
the same will be
exposed after removing
the tripping spring
Figure 13
c)
When dismantling the middle phase:

Remove the indicating disc securing dowel pin and remove the indicating disc.

Ensure that the position of the assembly in relation to the drive shaft is marked.

Remove the circlips securing joints pivot pins (refer to figure 13).
Unique Identifier:
Type:
Revision:
Page:
Type: 66 OSM 10 / 66 OSM 10 – X1,
34-1334
DMN
0
14 of 23
Use the pin punch to remove the dowel pin securing the interphasing links operating arm and
remove the operating arm assembly (refer to figure 13).
(refer to figure 13).
d)
To remove the right outer phase:
Remove the auxiliary contacts actuating links by removing the circlips and pins securing the
links onto the operating arm (see figure 14).
Use the pin punch to remove the dowel pin securing the interphasing links operating arm and
remove the operating arm assembly (refer to figure 13).
(refer to figure 13).
e)
Clean the crank housing and seal / gasket slots.
f)
Fit new seals and the gaskets onto the flange and use the special tool to fit the flange over the
drive shaft.
g)
Assemble the drive shaft / flange assembly onto the crank casing in reverse order.
h)
Check hydraulic / charging cylinder for oil leaks and pivot joints for excessive wear.
i)
Ensure that the hydraulic / charging cylinder is free off hydraulic pressure and then disconnect the
hydraulic pipe (see figure 14).
j)
If the cylinder is found to be leaking and a spare cylinder is available loosen and remove the
charging cylinder securing screws, plates and the pins and replace the cylinder with the new one (see
figure 14).
Figure 14
k) Where damaged cylinder is to be repaired remove the cylinders from the mechanism box and disassemble the cylinders.
l)
Replace the seals with new ones and assemble all the cylinders in the reverse order.
m) Check the pivot joints for excessive wear, missing split pins or circlips and replace worn or
missing parts on the pivot joints.
n) To check the hydraulic pump motor, label and disconnect the supply wires and disconnect the oil
pipes (see figure 15).
o) Loosen and remove the hydraulic pump motor assembly mounting bolts, remove the hydraulic
pump motor assembly from the mechanism box (see figure 15).
Unique Identifier:
Type:
Revision:
Page:
Type: 66 OSM 10 / 66 OSM 10 – X1,
34-1334
DMN
0
15 of 23
Figure 15
p) Dis-assemble the drive motor assembly, check the bearings to be in order, if not replace them
with new ones, dis-assemble the hydraulic pump, replace all the seals and assemble the drive motor
assembly (refer to figure 15).
q)
Check the non-return valve for leaks and replace the seals if any hydraulic oil leaks.
r) Check the auxiliary contacts and contact blocks for oxidation, cracks, excessive rust on the
screws, if damaged replace the damaged part with the new one (see figure 16).
Figure 16
s) To replace the auxiliary contacts, label connected wires, disconnect them from the contacts,
disconnect all connected operating link, replace the affected part with a new one and re-assemble it in
reverse order.
t)
Ensure the hydraulic fluid reservoir is clean and free from foreign matter. When topping up, fill to
a level of 19 mm below the rim with hydraulic fluid. The average capacity of the reservoir is 2 litres.
u)
The mechanism bearings are the self-lubricating type and therefore require no lubricating.
v) Check that all linkages, springs, pins and circlips are in good condition, check that all bolts and
nuts are tight.
w)
Check and replace mechanism box and or auxiliaries panel door seals when necessary.
x) Check the mechanism heater to be in functioning order where one is installed, if not replace it
with the new one.
4.3.3.7
Re-assembly
a) Re-fit the cylinders and the drive motor assemblies into position, reconnect all hydraulic pipes and
reconnect motor supply wires in reverse order.
b) Clean the terminal/contact blocks and auxiliary contacts, ensure that all contacts are in good
condition (refer to figure 16).
c)
Assemble the fixed contact and the turbulators assemblies together
Type: 66 OSM 10 / 66 OSM 10 – X1,
Unique Identifier:
Type:
Revision:
Page:
34-1334
DMN
0
16 of 23
d) Re-fit the correctly assembled fixed contact/turbulator device assemblies into the pole cylinder,
ensure that the assembly is seated correctly under the clamping plates and dowel pin, tighten all
clamping plate securing nuts and Allen screws securing the fixed contact assembly.
e)
Assemble the oil gauge onto position and ensure that correct parts are being used.
f)
Slow-open the circuit-breaker, flush out all chambers with approved oil until clean oil comes out
from the drain valve, and allow oil to drain (see slow closing and opening of the circuit-breaker).
g)
Refill the circuit-breaker poles with approved oil to normal service level.
h) Ensure that all pole hood lid gaskets are replaced with new ones, fit hood lids and tighten the
securing bolts.
i)
Clean the mechanism, auxiliary contact assemblies and mechanism box of dust and excessive
grease or oil deposits.
4.3.3.8
Adjustments
Not applicable.
4.4
Modifications
NOTE: Only approved modifications shall be carried out.
a) If the circuit-breaker fails to latch, then the tripping latch shall be modified as follows: To remove
the tripping latch, first remove the screw and locking plate. The pin can now be pulled out and the
tripping latch can be removed.
b) Bending the contact face back slightly will modify the tripping latch. The tripping latch can then be
refitted.
5
Tests
a)
Test contact resistance across main and transfer contacts: Maximum 70μΩto 115μΩper phase.
b)
Test minimum release voltage of main and back-up trip coils: 65% of nominal voltage.
c)
Measure trip and close coil current.
d)
Check closing and opening times with a speed recorder:

Opening time 30 ms to 40 ms and

Closing time 110 ms to 150 ms.
e)
Record spring rewind time of the motor: maximum is15s.
f)
Record resistance values of the coils for future reference.
g)
Record maximum allowable time discrepancies between phases:.

Close, maximum is 5ms and

Open, maximum is 5ms.
h) Carry out an insulation test if leakage to earth is suspected due to damaged bushings,
contaminated oil or if excessive moisture is found inside the circuit-breaker pole.
Type: 66 OSM 10 / 66 OSM 10 – X1,
6
Related/Supporting Documents
6.1
Related Documents
Unique Identifier:
Type:
Revision:
Page:
34-1334
DMN
0
17 of 23
a) Critical task analysis:

Work in Live Chambers and Prohibited areas;

High Voltage Operating; and

Work with/on Extension/Single Ladders.
b) Training module;
c) Manufacturers manual.
6.2
Forms and Records
The attached report shall form the record of work done.
The completed report must be returned to the Work Co-ordinator together with the work order and a
copy to the Technical Services Group.
7
Spares
Refer to 4.3.1.1Materials
Unique Identifier:
Type:
Revision:
Page:
Type: 66 OSM 10 / 66 OSM 10 – X1,
34-1334
DMN
0
18 of 23
Annex A - Circuit-breaker report
FORM TITLE
CIRCUIT-BREAKER
FORM NUMBER
DMN_34-1334 REV DATE
JANUARY 2014
Distribution Task Manual – Part 11:
Type: 66 OSM 10 / 66 OSM 10 – X1,
DOCUMENT TITLE
SUBSTATION
PANEL / FEEDER
Circuit-breaker
TYPE
MAKE
kV
AMPS
SERIAL NUMBER
R Ph:
W Ph:
B Ph:
kA
Mechanism
DRIVE
TYPE
POLE NUMBER
HEATER
Before:
SUPPLY VOLTAGE: (tick which is applicable)
COUNTER
After:
110 V D.C.
Tests
Contact resistance (micro-ohm)
R Phase
W Phase
B Phase
SERIAL NUMBER
R Ph:
W Ph:
B Ph:
220V D.C.
220V A.C.
Contact penetration (mm)
R Phase
W Phase
B Phase
TEST 1
TEST 2
TEST 3
COILS
Minimum trip release voltage
Main
R Ph:
Back-up
R Ph:
Minimum close release voltage
Coil amperage
Main trip:
Coil resistance
Main trip:
Phase
Close
Red A
Red B
White A
White B
Blue A
Blue B
Motor rewind time to recharge spring:
Time discrepancies between phases
Insulation test
R Phase
S to E
L to E
S to L
W Ph:
W Ph:
B Ph:
B Ph:
Back-up:
Back-up:
Speed recording test
Trip
Trip/close
Trip:
W Phase
B Phase
Close:
Close:
Close/trip
Close:
SF6 gas alarm test
Nominal at 20oC
Alarms
Lock-out at
Unique Identifier:
Type:
Revision:
Page:
Type: 66 OSM 10 / 66 OSM 10 – X1,
34-1334
DMN
0
19 of 23
Annex A
(concluded)
Checklist
Good
Replaced
Fixed contacts
Good
Replaced
Oil / SF6 /
Vacuum
Gauge
glasses
Seals
Valves
Door seals
Arcing ring
Moving contacts
Transfer contacts
Arc control
device
Inspect
Lubricate
Good
Replaced
Lubricate
No leaks
Coils
Motors
Pumps
Contactor
Counters
Free
Close latch
Trip latch
Needle bearings
Interlocks
Inspect
Drives
Damper
Springs
Shafts
Mechanism Test
Operate correctly
Mechanism/Levers System
Recommendations/Comments:
WORK DONE BY…………….………..
ACCEPTED BY: …………………………
SIGNATURE: ……………………………
DATE: …………………………………….
Type: 66 OSM 10 / 66 OSM 10 – X1,
Unique Identifier:
Type:
Revision:
Page:
34-1334
DMN
0
20 of 23
Annex B-Impact assessment
1. Guidelines
o
o
o
o
All comments must be completed.
Motivate why items are N/A (not applicable)
Indicate actions to be taken, persons or organisations responsible for actions and deadline for
action.
Change control committees to discuss the impact assessment, and if necessary give feedback
to the compiler of any omissions or errors.
2. Critical points
2.1 Importance of this document. E.g. is implementation required due to safety deficiencies,
statutory requirements, technology changes, document revisions, improved service
quality, improved service performance, optimized costs.
Comment: Statutory requirements and or document revisions
2.2 If the document to be released impacts on statutory or legal compliance - this need to be
very clearly stated and so highlighted.
Comment: No impact on statutory or legal compliance and mainly document revisions
2.3 Impact on stock holding and depletion of existing stock prior to switch over.
Comment: N/A - No new equipment or item need to be acquired for implementation of this document.
2.4 When will new stock be available?
Comment: N/A –see 2.3 above.
2.5 Has the interchange ability of the product or item been verified - i.e. when it fails is a
straight swap possible with a competitor's product?
Comment: N/A – It is a maintenance document and also see 2.3 above.
2.6 Identify and provide details of other critical (items required for the successful
implementation of this document) points to be considered in the implementation of this
document.
Comment: Consult / Refer to SCSASABA8 for revised earth application when implementing the
document.
2.7 Provide details of any comments made by the Regions regarding the implementation of this
document.
Comment: None.
Unique Identifier:
Type:
Revision:
Page:
Type: 66 OSM 10 / 66 OSM 10 – X1,
34-1334
DMN
0
21 of 23
Annex B
(continued)
3. Implementation timeframe
3.1 Time period for implementation of requirements.
Comment: N/A – No technical changes were made to this document.
3.2 Deadline for changeover to new item and personnel to be informed of DX wide changeover.
Comment: None.
4. Buyers Guide and Power Office
4.1 Does the Buyers Guide or Buyers List need updating?
Comment: NO.
4.2 What Buyer’s Guides or items have been created?
Comment: NONE.
4.3 List all assembly drawing changes that have been revised in conjunction with this
document.
Comment: NONE – The configuration hasn’t changed.
4.4 If the implementation of this document requires assessment by CAP, provide details under
5
Comment: N/A – The revision requires no new equipment / assessment.
4.5 Which Power Office packages have been created, modified or removed?
Comment: NONE:
5. CAP / LAP Pre-Qualification Process related impacts
5.1 Is an ad-hoc re-evaluation of all currently accepted suppliers required as a result of
implementation of this document?
Comment: NO
5.2 If NO, provide motivation for issuing this specification before Acceptance Cycle Expiry
date.
Comment: N/A – The document doesn’t specify but stipulated the maintenance procedures on the
existing equipment.
Unique Identifier:
Type:
Revision:
Page:
Type: 66 OSM 10 / 66 OSM 10 – X1,
34-1334
DMN
0
22 of 23
Annex B
(continued)
5.3 Are ALL suppliers (currently accepted per LAP), aware of the nature of changes contained
in this document?
Comment: N/A – The specification is supplied to the suppliers not this document.
5.4 Is implementation of the provisions of this document required during the current supplier
qualification period?
Comment: Yes – This is the revision of document that is presently being implemented and requires no
change to the supplier’s qualification period.
5.5 If Yes to 5.4, what date has been set for all currently accepted suppliers to comply fully?
Comment: N/A – see 5.4 above.
5.6 If Yes to 5.4, have all currently accepted suppliers been sent a prior formal notification
informing them of Eskom’s expectations, including the implementation date deadline?
Comment: N/A – see 5.4 above.
5.7 Can the changes made, potentially impact upon the purchase price of the
material/equipment?
Comment: N/A – No new material is required.
5.7.1
Material group(s) affected by specification: (Refer to Pre-Qualification invitation
schedule for list of material groups)
Comment: N/A – No new material is required.
6. Training or communication
6.1 State the level of training or communication required to implement this document. (E.g.
none, communiqués, awareness training, practical / on job, module, etc.)
Comment: Practical / On job and training module.
6.2 State designations of personnel that will require training.
Comment: TSO, PTO & STO.
6.3 Is the training material available? Identify person responsible for the development of
training material.
Comment: Yes – DT- Training is revising earthing related training manual which will address the
changes in this document.
6.4 If applicable, provide details of training that will take place. (E.G. sponsor, costs, trainer,
schedule of training, course material availability, training in erection / use of new
equipment, maintenance training, etc).
Comment: Safety and Maintenance training.
Unique Identifier:
Type:
Revision:
Page:
Type: 66 OSM 10 / 66 OSM 10 – X1,
34-1334
DMN
0
23 of 23
Annex B
(concluded)
6.5 Was Training & Development Section consulted w.r.t training requirements?
Comment: Yes.
7. Special tools, equipment, software
7.1 What special tools, equipment, software, etc will need to be purchased by the Region to
effectively implement?
Comment: NONE.
7.2 Are there stock numbers available for the new equipment?
Comment: N/A – No new equipment is required.
7.3 What will be the costs of these special tools, equipment, software?
Comment: N/A – No new equipment is required.
8. Finances
8.1 What total costs would the Regions be required to incur in implementing this document?
Identify all cost activities associated with implementation, e.g. labour, training, tooling,
stock, obsolescence
Comment:
No costs other than the training will be incurred by the regions and this will depend on the
arrangements made for training ie Training is held regionally or nationally.
Impact assessment completed by:
Name: David M. Ntombela
Designation: Consultant