Performance item

Unit

requirement

DC resistance of conductor

Ω/km

The value conversed into 1km length at 20°C should be less than or equal to the regulations specified in GB/T3956

Partial discharge test

pc

Under the condition of AC35KV, the local discharge amount should not be more than 10pC.

Voltage test

kv

Withstand the test of AC 73.5kV for 5min, without breakdown of insulation

Test for thermal extension

Conditions for treatment

Air temperature(±3°C)

°C

200

Loading time

Min

15

Mechanical stress

N/cm

20

Max. elongation when loading

%

175

Longest & permanent elongation after cooling

%

15

The test of AC for 4h

kv

Withstand the test of voltage 84kv for 4h, without breakdown of insulation