EPR & XLP
PILC**
5kV
Cable,
25kV
30kV
15kV
Cable,
100
Percent
Insulation
*53kV/55kV
65kV
15kV
Cable,
133
Percent
Insulation
*53kV/65kV
85kV
25kV
Cable,
100
Percent
Insulation
*78kV/80kV
105kV
25kV
Cable,
133
Percent
Insulation
*78kV/100kV
135kV
28kV
Cable,
100
Percent
Insulation
*78kV/85kV
115kV
35kV
Cable,
100
Percent
Insulation
100kV
145kV
*Use lower value when insulated connectors are connected to the cable
being tested.
**When PILC cable has nonmetallic outer jacket, reduce these values by 10
percent.
**************************************************************************
(a) Current-sensing circuits in test equipment shall measure only
the leakage current associated with the cable under test and shall
not include internal leakage of the test equipment.
(b) Record wet- and dry-bulb temperatures or relative humidity
and temperature.
(c)
Test each section of cable individually.
(d) Individually test each conductor with all other conductors
grounded; Ground all shields.
(e) Terminations shall be properly corona-suppressed by guard
ring, field reduction sphere, or other suitable methods as
necessary.
(f) Ensure that the maximum test voltage does not exceed the
limits for terminators specified in IEEE standard 48 or
manufacturer's specifications.
(g) Apply the DC high-potential test in at least five equal
increments until maximum test voltage is reached. No increment
shall exceed the voltage rating of the cable. Record DC leakage
current at each step after a constant stabilization time
consistent with system charging current.
(h) Raise the conductor to the specified maximum test voltage and
hold for fifteen (15) minutes. Record readings of leakage current
at 30 seconds and one minute and at one-minute intervals
thereafter. Provide a graphic plot of readings with leakage
current (X axis) versus voltage (Y axis) at each increment.
(i) Reduce the conductor test potential to zero and measure
residual voltage at discrete intervals.
(j) Apply grounds for a time period adequate to drain all
insulation stored charge.
(k) When new cables are spliced into existing cables, the DC
high-potential test shall be performed on the new cable prior to
splicing. After test results are approved for new cable and the
splice is completed, an insulation-resistance test and a
SECTION 16302N
Page 41
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