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HT Breaker Checklist - Fy22

This document is a checklist for maintenance of high voltage circuit breakers. It includes checks of the physical condition, mechanisms, electrical components, and testing procedures. Tests include insulation resistance testing at 5000V, contact resistance measurement at 100A, coil resistance checks, and operating time interval testing. For SF6 breakers, checks include gas pressure, auxiliary switch inspection, and mechanical interlock functionality. The checklist requires sign off by the technician and inspector, along with notes on test results and any issues.

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337 views1 page

HT Breaker Checklist - Fy22

This document is a checklist for maintenance of high voltage circuit breakers. It includes checks of the physical condition, mechanisms, electrical components, and testing procedures. Tests include insulation resistance testing at 5000V, contact resistance measurement at 100A, coil resistance checks, and operating time interval testing. For SF6 breakers, checks include gas pressure, auxiliary switch inspection, and mechanical interlock functionality. The checklist requires sign off by the technician and inspector, along with notes on test results and any issues.

Uploaded by

chandan
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOC, PDF, TXT or read online on Scribd
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HT BREAKER CHECKLIST:-CEM-SGPT

DATE OF MAINTENANCE: - _ _ / _ _ / 20 _ _ , DEPT/AREA_________/_____________________ ,TYPE .:-_________________


SWITCHBOARD NAME :- ___________________________________________________________ W P NO: - _______________
NAME OF THE FDR:- ______________________________________________________________, PNL NO.__________________
RATED CURRENT: - _________Amps. ,CB SR. NO: - ____________________________________, COUNTER READING_________
FOR BREAKER COMPARTMENT: - Caution:-Do not touch the safety shutter if busbar is live.
GENERAL CONDITION BEFORE MAINTENANCE DRY CLEAN DAMP DUSTY
PHYSICAL CONDITION BEFORE MAINTENANCE OK CRACKS DENT DISCOLORATION
CHECKED DOOR, RAIL & SAFETY SHUTTER ALIGNMENT SMOOTH RACK IN/OUT & TROLLEY WHEEL CHECK .
CHECKED EARTHING BUS CLEANLINESS & SULPHATION. INSPECTED MALE/FEMELE PLUG FOR ANY LOOSE PIN.
FOR VCB/SF6 CB: - Caution:-Ensure complete discharge of both spring before doing maintenance of operating mechanism.
GENERAL CONDITION BEFORE MAINTENANCE DRY CLEAN DAMP DUSTY.
PHYSICAL CONDITION BEFORE MAINTENANCE OK CRACKS DENT DISCOLORATION.
CHECKED FOR MISSING OR DAMAGED PARTS. CHECKED FOR TIGHTNESS OF MECHANISM
CHECKED FOR SMOOTH SPRING CHARGING OPERATION. CHECKED FOR SMOOTH MANUAL ON/OFF OPERATION
I PROPER LUBRICATION OF MECHANISM DONE. PHASE BARRIER /INSULATION EXAMINED.
INSPECTED TULIP CONTACT ALIGNMENT, TIGHTNESS & LUBRICATION. NO/NC STATUS OF THE CB AUX SWITCH
CHECKED FOR ALL MECHANICAL INTERLOCKS ARE WORKING OR NOT. CHECK CONTROL CABLE MALE PLUG PINS.
CHECK CARBON BRUSH/MICROSWITCH/LIMIT SWITCH/OIL DASH POT CHECK OPERATING ROD/ MECHANISM LOOSENESS
WASH MECHANISM/TULIP USING CRC ADJUST/RECTIFY IF FOUND ANY DUMMY OPERATION
CHECKED FOR I R TEST AT 5000V. : (R-R’)________ (Y-Y’)________ (B-B’)________. (OPEN CONDITION)
: (R-E )________ (Y-E)________ (B-E )________ . (CLOSE CONDITION)
: (R-Y )________ (Y-B)________ (B-R )________ . (CLOSE CONDITION)
CHECKED FOR CRM TEST AT 100A : (R-R’)___________ , (Y-Y’) _______ (B-B’) ________.(CLOSE CONDITION)
CHECKED FOR COIL RESISTANCE. : (YC COIL) ________ ,(YO COIL- 1) ______, (YO COIL- 2) _______, (YU COIL)_______
: MOTOR COIL RESISTANCE _____________ ; RL2 COIL _______________.
CHECKED FOR OPERATING TIME INTERVAL TEST:
Ref. CLOSE CLOSE CLOSE OPEN OPEN OPEN C-O C-O C-O
(R ph) (Y ph) (B ph) (R ph) (Y ph) ( B ph) (R ph) (Y ph) (B ph)
Time in
(Ms)

HPA/HCA TYPE CB SF6 GAS PRESSURE TO BE CHECKED: - AUX SWITCH CRACK INSPECTION FINAL TRIAL OF MECH.INTERLOCKS

CHECK CONTINUITY IN PRESSURE SWITCH CONTACT PINS: BB1 BB2 BB3


 YES NO? -------------------
FAULTY/CRACK SWITCH_________
R POLE – HEALTHY NO ; LOW PRESSURE NC
Y POLE - HEALTHY NO LOW PRESSURE NC FINAL TRIAL TAKEN IN TEST POSITION?
FINAL AUX CONTACTS SWITCH CHECK?
B POLE -HEALTHY NO LOW PRESSURE NC YES NO? ------------------  YES NO? -------------------
VIDAR TEST:
CHECK VACCUM INTERRUPTER AS PER RATING FOR 30 SECONDS : VI HEALTHY:- PASS FAIL
RACK IN/OUT CHECKED BY ENGINEER AFTER THE MAINTENANCE :- DONE NOT DONE

TEST RESULT VERIFIED BY/MOB NO :-_______________________________________________/____________________


CHECKED BY (DEPT) IEM NAME /MOB.NO :- ______________________________________________/_____________________
FEEDBACK FROM DEPT:-_____________________________________________________________________________________
REMARKS:

MAINTENANCE PERFORMED BY BREAKER STATUS FOR CHARGING :- OK NOT OK

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