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Check List for Circuit Breakers

Er. Parbhakar Dwivedi
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Check List for Circuit Breakers Document Ref. No. 2.12
Contractor: Client:
Project: Location:
Supplier/Vendor:
Reference Drawing no:
Check List (Please tick mark in appropriate column)
Check Points Observations
Contactor/ Vendor Client
Preliminary Check
Check name plate details according to Specification.
Check for physical damage.
Check tightness of all bolts, clamps and Connecting terminals.
Check oil level, air pressure and leakage (Wherever applicable).
Check earth connections.
Check cleanliness of insulators and Bushings.
Check all moving parts are properly Lubricated.
Check heaters provided.
Commissioning Checks
Check alignment of breaker trucks for free movement, check correct operation of shutters.
Slow-closing / opening operation
Check control wiring for correctness of connections, continuity and IR values
Manual operation of breakers (only after Filling oil in the tank). Power closing / opening operation manually and electrically
Breaker closing and tripping time
Breaker closing and tripping time
IR values, resistances and minimum pick up voltage of coils
Contact resistance
Simultaneous closing of all three phases
Pole discrepancy tests
Single and three phase auto-reclose operation
Check electrical & mechanical interlocks provided
Checks of spring charging motor: correct operation of limit switches and time of charging
Checks on C.Ts
All functional checks
Oil pressure in case of minimum oil circuit breakers of E.H.V circuits
Additional checks for Air Blast Circuit breakers
Calibration of pressure gauges and pressure switches
Air leakage tests
Adequacy of air receivers, for the designed set for operation
Operation of breaker (by pneumatic and electric impulses) at the pressures specified
Time of blowing-out of air during closing and opening operation
Checks on ‘drying air device’
Blocking of opening at low pressure
Pneumatic pole discrepancy protection
Safety valve settings
Check the compressed air supply system and pressure switch settings
General remarks, if any

 

 

 

Checked by:____________________________ (Site Engineer) Signature:

Date :

Review and approval by: CM/ PM

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