ELECTRICAL FIELD TEST SF6 PAD MOUNTED SWITCHGEAR

MECHANICAL INSPECTION SF-6 PAD-MOUNTED SWITCHGEAR

1.      Inspect for physical damage and compare nameplate data with plans and specifications.

2.      Perform mechanical operations tests in accordance with manufacturer’s instructions.

3.      Verify proper operation grounding switch.

4.      Check interlocks for correct operation.

5.      Check for positive gas pressure in SF-6 switches, verify no leaks.

6.      Verify use of proper cable termination’s (Elastimold 600 Amp with voltage test point) and phasing.

7.      Verify hardware is properly installed and torqued.

8.      Grounding installed.

9.      Switches have exterior coating in accordance with standards requirements for area location.

10.  Verify current rating and sizing of current transformers and that they are properly installed.

11.  Verify internal arc over pressure exhaust venting is properly installed.

NOTE: ELECTRICAL FIELD TEST SF6 PAD MOUNTED SWITCHGEAR

YES
NO

ELECTRICAL FIELD TEST SF6 PAD MOUNTED SWITCHGEAR

1.      Perform insulation resistance test on each pole, phase to phase and phase to ground for one (1) minute.

2.      Perform A.C. or D.C. high potential test on each pole to ground and pole to pole with the switch in the closed position. High potential test voltages shall be applied in accordance with vendors recommended values.

3.      Perform contact resistance test across each interrupter. Contact resistance shall be determined in micro-ohms. Any value exceeding 150 micro-ohms or any values which deviate from adjacent poles or similar switches by more than 20 percent (20%) should be investigated.

4.      Verify continuity of ground connection between breaker and ground grid via current injection.

5.      Perform trip tests for circuit breakers.

6.      Verify settings and operation of protective relays.

YES
NO

Nameplate Data SF-6 PAD-MOUNTED SWITCHGEAR

Switch No.
Manufacturer
Model No.
Serial No.
Rated Voltage
Rated Current

 

TEST DATA SF-6 PAD-MOUNTED SWITCHGEAR

Electrical
Mechanical tests
Manufacturer’s
recommended test values
PHASE A
PHASE B
PHASE C
Insulation Resistance
Breaker closed
Phase to ground Megohms
__________
Breaker closed
Phase to ground Megohms _________
Breaker closed
Phase to ground Megohms _________
Contact Resistance
Breaker closed Micro-ohms _______________
Breaker closed Micro-ohms ________________
Breaker closed Micro-ohms ________________
Interrupter AC High Potential
PASS ™
FAIL ™
PASS      ™
FAIL       ™
PASS       ™
FAIL        ™

 

HIGH POTENTIAL TEST OF SF-6 PAD-MOUNTED SWITCHGEAR

Breaker Closed
Current AC or DC
Breaker Open
Current AC or DC
Phase A to gnd
Phase A line to load
Phase B to gnd
Phase B line to load
Phase C to gnd
Phase C line to load
Phase A to B
Phase A to C
Phase B to C

 

 

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