equipment. The test shall be conducted with all splices, connectors, and
terminations in place. The method, voltage, length of time, and other
characteristics of the test for initial installation shall be for the
particular type of cable installed, except that 28 kV and 35 kV insulation
test voltages shall be in accordance with either AEIC C8 or AEIC CS6 as
applicable, and shall not exceed the recommendations of IEEE Std 404 for
cable joints and IEEE Std 48 for cable terminations unless the cable and
accessory manufacturers indicate higher voltages are acceptable for
testing. Should any cable fail due to a weakness of conductor insulation
or due to defects or injuries incidental to the installation or because of
improper installation of cable, cable joints, terminations, or other
connections, the Contractor shall make necessary repairs or replace cables
as directed. Repaired or replaced cables shall be retested.
3.11.6
Low-Voltage Cable Test
**************************************************************************
NOTE: The insulation resistance test (dielectric
test) value is based on the recommendation contained
in IEEE Std 525, IEEE Guide for the Design and
Installation of Cable Systems in Substations.
**************************************************************************
Low-voltage cable, complete with splices, shall be tested for insulation
resistance after the cables are installed, in their final configuration,
ready for connection to the equipment, and prior to energization. The test
voltage shall be 500 volts dc, applied for one minute between each
conductor and ground and between all possible combinations conductors in
the same trench, duct, or cable, with all other conductors in the same
trench, duct, or conduit. The minimum value of insulation shall be:
R in megohms = (rated voltage in kV + 1) x 304.8/(length of cable in meters)
R in megohms = (rated voltage in kV + 1) x 1000/(length of cable in feet
Each cable failing this test shall be repaired or replaced. The repaired
cable shall be retested until failures have been eliminated.
3.11.7
Liquid-Filled Transformer Tests
The following field tests shall be performed on [all liquid-filled
transformers] [liquid-filled transformers [_____] kVA and above].
Pass-fail criteria shall be in accordance with transformer manufacturer's
specifications.
a.
Insulation resistance test phase-to-ground.
b.
Turns ratio test.
c.
Correct phase sequence.
d.
Correct operation of tap changer.
e.
[_____]
3.11.8
Dry-Type Transformer Tests
The following field tests shall be performed on [all dry-type transformers]
[dry-type transformer [_____] kVA and above]. Pass-fail criteria shall be
SECTION 16375A
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