Sonel S-36 VLF, Руководство пользователя

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S-36 VLF
– USER MANUAL
10
2.3.2 DC testing
Suitable for:

MV-Cables with Paper-Oil-Insulation (PILC).
Requirements of CENELEC HD 621 standards for voltage test across the insulation:
Testing voltage:
see table
Testing time: 15 to 30 minutes
Requirement: no breakdown shall occur during testing period
Cable rating U
0
/ U 3.6 / 6 kV 6 / 10 kV 8.7 / 15 kV 12 / 20 kV
DC-Test voltage 20-29 kV 34-48 kV 52-69 kV 67-96 kV
max. permissible leak-age
current (per core)*
500
µA/km
700
µA/km
700
µA/km
700
µA/km
* Practical values, not required in the standard.
DC-Polarity:
Testing voltage on conductor: negative
Cable shield on station ground: positive
2.3.3 Cable Sheath
– Testing
Suitable for:

MV-Cables with PE or PVC-Sheath (Jacket).
Requirements of CENELEC HD 620 for voltage test across cable sheath (jacket):
PVC-Sheath:
≤3 kV DC voltage
PE-Sheath:
≤5 kV DC voltage
Testing time: 10 minutes (practical value)
Requirement: no breakdown shall occur during testing period
Limits for leakage currents*:
PVC at 3 kV: max. 800
µA / km
PE at 5 kV: max. 20
µA / km
* Practical values, not required in the standard.
Polarity: Cable shield on negative potential,
Station ground on positive potential