AUTOMATIC TRANSFER SWITCH ELECTRICAL FIELD TEST

AUTOMATIC TRANSFER SWITCH MECHANICAL VISUAL INSPECTION

Yes
No
1.      Inspect for physical damage.
2.      Compare equipment nameplate information and connections with single line diagram and report any discrepancies.
3.      Check switch to insure positive interlock between normal and alternate sources.
4.      Check tightness of all cable connections and bus joints.
5.      Perform manual transfer operation.
6.      Transfer switch and compartment are clean and dust free.
7.      Verify all vendor control cable wiring.
8.     Check terminations and tagging.

AUTOMATIC TRANSFER SWITCH ELECTRICAL FIELD TEST

Yes
No
1.      Perform insulation resistance tests phase to phase and phase to ground with switch in both alternate and source positions.
2.      Perform electrical insulation and contact resistance tests as referenced.
3.      Set and calibrate the Voltage Sensing relays.  Contact PDD for settings.
4.      Set and calibrate the Transfer Time delay relay.  Contact PDD for settings.
5.      Perform automatic transfer by simulating loss of normal power.
6.      Perform automatic transfer by return to normal power.
7.      Monitor and verify correct operation and timing of Normal Voltage sensing relays.
8.      Monitor and verify correct operation and time delay upon transfer.
9.      Monitor and verify correct operation and timing of Alternate voltage sensing relays.
10.  Monitor and verify correct operation and timing of Automatic transfer operation.
11.  Monitor and verify correct operation and timing of mechanical and electrical interlocks and limit switches
12.  Monitor and verify correct operation and timing, of time-delay and retransfer upon normal power restoration.

 

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1 Response

  1. August 7, 2018

    […] Please read also: AUTOMATIC TRANSFER SWITCH ELECTRICAL FIELD TEST_PRECOMMISSIONING […]

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