A large number of AC distribution cable in southern China

especially in coastal areas

operate in water environment for a long time. Accurate assessment of the insulation performance of the cable under water environment is of great significance to the safe and stable operation of power grid. Eighty groups of 10 kV AC distribution network XLPE cables operating under different environmental conditions and loads are selected. The insulation condition of the selected cables are assessed by the comprehensive evaluation method of ideal solution-rank sum ratio and

at the same time

ultra-low frequency dielectric loss and oscillating wave partial discharge experiments are carried out on the selected cables and the effects of moisture and temperature on the insulation performance of the cables are studied in particular. The accuracy of the insulation condition assessment result of the cables is proved by the experimental results of ultra-low frequency dielectric loss and oscillating wave partial discharge. Therefore

before the insulation detection of multiple pieces of cables

the insulation condition of the cables to be tested can be evaluated by the comprehensive evaluation method of ideal solution-rank sum ratio so as to improve the maintenance efficiency of AC distribution network cables.