Sonel S-36 VLF, Руководство пользователя

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S-36 VLF
– USER MANUAL
8
2.3 Application
The portable Cable Test Set S-36 VLF is mainly used for insulation testing of Medium Voltage Power
Cable Systems. A sheath test can be performed with this device too.
Fields of application include:

testing of newly fit cables prior to commisioning,

re-commisioning after repair and maintenance,

re-commisioning of temporarily shut-down cables,

regular preventive testing.
It can be tested with the following test methods:

VLF (0.1 Hz AC voltage testing),

DC testing.
The test methods are described in more detail.
2.3.1 VLF testing
Suitable for:

MV-Cables with plastic insulation (XLPE, PE, EPR, HEPR),

MV-Cables with Paper-Oil-Insulation (PILC),

mixed cables.
Requirements of IEC 60502-2, CENELEC HD 620 S1, DIN VDE 0276-620 and DIN VDE 0276-621
for voltage test on the insulation:
Frequency of testing voltage: 0.1 Hz
Testing voltage: 3 x U
0
RMS value*
Testing time: 15 minutes (IEC 60502-2)
60 minutes (CENELEC HD 620 S1)
Requirement: no breakdown
Cable rating
U
0
/ U *
VLF test Voltage
U
test
3.8 / 6.6 kV 11.5 kV
RMS
/ 0.1 Hz
6 / 10 kV 18 kV
RMS
/ 0.1 Hz
6.35 / 11 kV 19 kV
RMS
/ 0.1 Hz
8.7 / 15 kV 26 kV
RMS
/ 0.1 Hz
12 / 20 kV 36 kV
RMS
/ 0.1 Hz
12.7 / 22 kV 38 kV
RMS
/ 0.1 Hz
18 / 30 kV 54 kV
RMS
/ 0.1 Hz
19 / 33 kV 57 kV
RMS
/ 0.1 Hz
* U
0
= cable rating phase to ground
U = cable rating phase to phase
VLF is the very best and most effective method for insulation testing of medium voltage power cables
with extruded (plastic) insulation.
Using 0.1 Hz VLF test voltage, weak spots in XLPE, PE and also oil impregnated paper insulated ca-
bles are quickly brought to a controlled breakdown without causing additional damage or aging to the
remaining cable insulation.