Electrical Properties

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Last Updated on Friday, 16 September 2011 14:44

Nominal and highest system voltages :

Nominal rated voltage Uo/U

Highest system voltage Um

Single phase system

Single phase system
kV/kV kV kV*) kV**)
0.6/1 1.2 1.4 0.7
1.8/3 3.6 4.2 2.1
3.6/6 7.2 8.3 4.1
6/10 12 14 7
8.7/15 17.5 20 10
12/20 24 28 14
18/30 36 42 21

Note :

 *) both phases insulated
**) one phase grounded

Routine test : The following tests which are carried out on all finished cable lengths are summarized in the following table.

Nominal voltage kV 0.6/1 1.8/3 3.6/6 6/10 8.7/15 12/20 18/30
Type of insulation PVC / XLPE / EPR XLPE / EPR
Test
High voltage test
AC test voltage
Test duration per core
kV
minute		 3.5
5		 3.5
5		 6.5
5		 12.5
5		 21
5		 30.5
5		 42
5		 63
5
Partial discharge test at 1.73 Uo Max. permissible discharge kV - - - 5.4 10.4 15.1 20.8 31.1
pC - - - 10 10 10 10 10
Measurement of the electrical resistance of conductor √ √ √ √ √ √ √ √
Check of construction and dimension √ √ √ √ √ √ √ √

Note :

 - Test is not carried out
√ Test is carried out