Specifications

PIP ELTFT01
Field Inspection and Testing of March 2001
New Electrical Equipment
Process Industry Practices Page 10 of 23
7.2.13 Inspect lubrication of breaker-operating mechanism and all other breaker
moving parts.
7.3. Testing Requirements
7.3.1 Test insulation resistance of switchgear bus with a 1-minute test (phase to
phase and phase to ground).
7.3.2 Test insulation resistance of all instrument transformers with a 1-minute test
at applicable voltage.
7.3.3 Test insulation resistance of each circuit breaker (closed position) with a
1-minute test (phase to phase and phase to ground).
7.3.4 Test circuit breaker contact resistance with micro-ohmmeter.
7.3.5 Test dielectric strength of each medium-voltage circuit breaker (closed
position) with DC high-potential unit using the step voltage method and with
final voltage value according to the table in paragraph 5.5, unless specified
otherwise by the Owner. (Isolate and test each phase to ground with the
other two-phase terminals connected together and to ground.)
7.3.6 Test integrity of each vacuum interrupter on a vacuum circuit breaker in
accordance with manufacturer's instructions.
7.3.7 Calibrate and test each protective relay. Settings on devices shall be in
accordance with the approved relay settings summary or coordination study.
7.3.8 Test each CT secondary circuit by applying current to CT secondary circuit
with CTs disconnected and by verifying operation of all applicable relays
and metering devices. Perform a ratio-verification test using the voltage or
current method in accordance with ANSI C57.13.1.
7.3.9 Test each window-type ground CT and their circuits by applying current to
conductor passed through the window.
7.3.10 Test each PT secondary circuit by applying voltage to PT secondary circuit,
with the PTs disconnected, and then by verifying the operation of all
applicable relays and meters.
7.3.11 Test voltmeter, ammeter, and related selector switches.
7.3.12 Test operation of all space heaters, including switching and indicating
devices.
7.3.13 Perform circuit breaker minimum voltage trip test. Trip unit should be
operable at 40 percent of nominal voltage.
7.3.14 Verify that each circuit breaker opening time meets the manufacturer’s
specifications.
7.3.15 For double-ended switchgear, test phasing after energizing but before closing
the tie breaker.