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IEEE Sid 400.2-2004
iting of Shielded Power Cable Systems Using Very Low
E Guide for Field T:
requency (WLP
‘Table 5—VLF test voltage for sinusoidal waveform (see Note 1)
Cable rating Installation (see Note Acceptance (see ‘Maintenance (see Note 3}
phase to phase ¢ to ground phase in pre phase to ground
ams voliage in kV ms or (peak voltage) ams or (peak voltage) rms or (peak voltagc)
5 913) 10 (14) Tao)
# 11 (16)
15 18
25 2743
5, 39 55)
NoT!
IF fis and peak values, Fora sinusoidal waveform Use rms is 0,
over 15000 XLPE cable circuits tested showed that ~68% of the recorded failures
‘aceuered within 1 Within 30 minutes, ~9596 afer 45 minutes, and 100% after 60 minutes (Mob [B17])
The recommended testing time varies between 15 and 60 minutes, although the data in Moh [117] suguest
testing time of 4 minutes, The actual testing time and voltage may be defined by the supplier and user and depend on
the testing. philosophy, cable syste . how frequently the test is conducted, and the selected test
method. Testing databases ot Eager et al. (B7] may be consulted when choosing a preferred testing time. When a LF
rupted, it ix recommended that the testing th me when the WLF testis restarted,
The results
be reset to the original
3—Fora0.1 Hz WLF test voltage, the suggesied ve duration is 15 minutes (Eay
the range of O41 Hx to 1 Hz, The most
ly available VILF test frequency is 0.1 Hz. Other commercially available
of 0.0001 Hz to 1 Hz. These frequencies may be useful for diagnosing cable
y weeds the limitations of the test system at 0.1 Hu, although
g below 0.1 Hz may increase the risk of failure in service fallowing the test
al impedance of the test set can limit the available charging current, preventing the
i reaching the required test voltage. Testing databases; Eager et al. (B7]; ot Baur,
upi, and Schlick [B5] may be consulted when selecting an initial test voltage level and testing time
for a particular cable length
commonly used, commerc
frequencies are in the
systems where the Length
there is evidence that testi
Moh [B17], The int
cable under test fre
Moh
duratic
VLF test voltages with cosine-rectangular and the sinusoidal wave shapes are most commonly used. While
other VLF wave shapes are available for testing of cable systems, recommended test voltage levels have
‘not been established.
5.1.2 Testing considerations
— Acroute map should be available to ensure personnel are familiar with the cables involved, the location
of open points, where the cables or joints may be accessible, and the types of cable constructions used.
cable system
— The test s
charging
used must be sufficiently powerful to supply
during every cycle.
id dissipate or recover the
g cuerg:
— In withstand tests, if the cable fails, fault locating may be required,
— In extreme cases in diagnostic testing, when the cable insulation is in an advanced condition of
degradation, the diagnostic tests can cause breakdown before the test can be terminated,
0 of
id be grounded
the conclusion of at an interrupt
immediately.
VLF test, the test object sh
Copyright © 2005 IEEE. All rights reserved
IEEE Sed 400.2-2004 coor il ieed ob a]
Oe
Table 5—VLF test voltage for sinusoidal waveform (see Note 1)
Cable rating Installation (see Note 2) | Acceptance (see Note 2) Maintenance (see Note 3)
phase to phase phase to ground phase to ground phase to ground
rms voltage in kV rms or (peak voltage) rms or (peak voltage) rms or (peak voltage)
5 9 (13) 10 (14) 7 (10)
5
8 11 (16) 13 (18) 10 (14)
18 (25) 20 (28) 16 (22)
27 (38) 31 (44) 23 (33)
33 (47)
NOTES
