ELECTRICAL FIELD TEST AND INSPECTION PROCEDURES OF SWITCHGEAR GENETRAL

FIELD INSTALLATION CHECK LIST
Mfg.
Location
Voltage Class
Main Bus Current Rating
Total Breakers and Types
Total
Relays and Types
VISUAL INSPECTION
Yes
No
1.   General inspection of exterior of equipment.
2.      Check panel lights for operation, burned out or missing bulbs LED’s and covers.
3.      Inspect for damaged, bent, or twisted doors and verify ground bonding.
4.      Inspect for broken instrument, relay cover glass and damaged phase indicator lights.
5.      Inspect bus for physical damage, missing insulation, connections at joints, confirm plating is acceptable.
6.      Check cleanliness of interior of cubicle
7.      Inspect insulation, stand-off insulators, and bus separators for damage or clearance problems.
8.      Inspect for proper compartmentalization as required.
MECHANICAL SWITCHGEAR INSPECTION
Yes
No
1.      Check control knobs and switches for freedom of movement and contact condition.
2.      Inspect door handles, locking bars, and mechanism.
3.      Check door interlocks for positive operation.
4.      Torque test bolted bus. (Exposed Connections only.)
5.     Check bus for support & spacing. Remove all shipping bracing.
6.      Remove draw out breakers. Check draw out mechanism for freedom of movement.
Yes
No
7.      Check rails, guides, rollers, and shutter mechanism.
8.      Lubricate draw out assembly parts as required.
9.      Inspect breaker and cell primary and secondary contacts and alignment.
10.  Close and trip breakers manually in the connected, test and disconnected positions.
11.  When applicable, check metering transformers compartments for proper operation of racking in/out, isolation features.  Check for proper grounding of fuses in the withdrawn position.
12.  Verify that all breakers of the same rating are inter-changeable by racking each breaker into each cell of the proper rating.
ELECTRICAL SWITCHGEAR INSPECTION
Yes
No
1.      Inspect for proper grounding of equipment and neutral bus.
2.     Measure insulation resistance to ground.
3.      Inspect and megger power cable or bus to switchgear.
4.      Clean bus insulators, Megger test for grounds.
5.      Dielectric test cables/terminations and bus work as specified.
6.      Inspect and test control and metering transformers and fuses as required.
7.      Verify operation of resistors, grid assemblies (if applicable) and space heaters.
8.      Verify the condition of wiring & terminal connections (point to point wire check).
9.      Note and report any unmarked circuits.
10.  Verify proper operation of cell interlocks and auxiliary contact assemblies.
11.  Perform breaker inspection and tests as specified.
12.  Inspect and test meters, transducers, and relays as specified.
13.  Perform relay calibration and settings.
14.  Check relays and protective devices for positive tripping of circuit breaker.
15.  Test annunciator, alarm and/or target operation.
16.  Verify proper phasing of bus.
17.  Verify all control fuse types and ratings.
18. Verify control circuits operate according to engineering specifications.

 

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  1. August 12, 2018

    […] Please check aslo:  ELECTRICAL FIELD TEST AND INSPECTION PROCEDURES OF SWITCHGEAR GENETRAL […]

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