electrically operated to verify that the proper breakers and alarms
initiate. Relaying current transformers shall be field tested in
accordance with IEEE C57.13.1.
3.5.4.2
Insulation Test
Generator and exciter circuits insulation resistance shall be tested in
accordance with IEEE Std 43. Stator readings shall be taken at the circuit
breaker, to include generator leads to [switchgear] [switchboard]. Results
of insulation resistance tests shall be recorded. Readings shall be within
limits specified by the manufacturer. Mechanical operation, insulation
resistance, protective relay calibration and operation, and wiring
continuity of [switchgear] [switchboard] assembly shall be verified.
Precautions shall be taken to preclude damaging generator components during
test.
3.5.4.3
Engine-Generator Connection Coupling Test
When the generator provided is a two-bearing machine, the engine-generator
connection coupling shall be inspected and checked by dial indicator to
prove that no misalignment has occurred. The dial indicator shall measure
variation in radial positioning and axial clearance between the coupling
halves. Readings shall be taken at four points, spaced 90 degrees apart.
Solid couplings and pin-type flexible couplings shall be aligned within a
total indicator reading of 0.012 to 0.025 mm 0.0005 to 0.001 inch for both
parallel and angular misalignment. For gear-type or grid-type couplings,
0.05 mm 0.002 inch will be acceptable.
3.5.5
Safety Run Test
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NOTE: For the sound level tests, modify the radial
distance requirement from the engine intake and
exhaust to account for obstructions, variations in
site conditions, building configurations, or
indicate points on the contract drawings at which
measurements are to be made. Add item x. to the
list below when a test for over/under frequency
alarms are provided. Coordinate the requirement
with paragraph Alarm Panels. Item x. should be
included as follows:
x. Manually adjust the governor to speed up the
engine to a level beyond the over frequency alarm
setpoint and record the frequency when the audible
alarm sounds. Return the speed to the rated value.
Shut down the engine-generator set.
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For the following tests, if any parts are changed, or adjustments made to
the generator set, its controls, or auxiliaries, the associated safety
tests shall be repeated.
a.
Perform and record engine manufacturer's recommended prestarting
checks and inspections.
b.
Start the engine, record the starting time, make and record engine
manufacturer's after-starting checks and inspections during a
reasonable warm-up period.
SECTION 16263A
Page 78
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