Capacitance rise phenomenon often appears in electric power system. However

less attention has been paid to this phenomenon in AC voltage withstand tests of high-voltage power cables

especially for long power cables. The capacitance rise phenomenon is usually ignored in the AC voltage withstand test for short power cable.While in the test for long cable

the situation becomes complex

where the capacitance rise even reaches several times of imposed voltage in the extreme condition

which is unacceptable in engineering. The paper analyzes the equivalent circuit of the cable’s distribution parameters

performs analog simulation to obtain the voltage responses at certain position under different frequencies and sheath grounding modes for ‘long’and ‘short’power cables

respectively

and offers corresponding suggestions.