基于电气性能综合评估的XLPE配网电缆受潮过程研究

Research on Damping Process of XLPE Distribution Network Cables Based on Comprehensive Electrical Performance Evaluation

为了研究不同受潮途径对电缆的作用效果,结合运行经验设置多种内源性、外源性受潮途径,进行90个循环周期的电缆加速受潮试验,并定期检测绝缘电阻、局部放电、去极化电流等,采用理想解法(TOPSIS)对试验电缆的受潮状态进行综合评估。结果表明:水分能够在电缆运行过程中通过破损本体、中间接头和电缆终端的多种界面结构进入电缆内部并快速扩散,中间接头浸水和内源性受潮的绝缘劣化效果最为突出,需要重点预防和关注。此外,基于绝缘电阻、局部放电和去极化电流的电气性能综合评估能够有效研究受潮过程、识别受潮状态,可以应用于实际工程以评估湿热环境下配网电缆的受潮问题。

In order to study the effects of different damping paths on cables,we set up a variety of endogenous and exogenous damping paths according to operating experience.Accelerated damping test were conducted on cables for 90 cycles,and the insulation resistance,partial discharge,and depolarization current were measured regularly.Then the moisture state of the cable was comprehensively evaluated by TOPSIS method.The results show that during cable operation,moisture can enter and rapidly spread inside the cable through the broken body,cable joints,and various interface structures of the cable terminals.The degradation effects of moisture through cable joints and endogenous moisture on the insulation is the most prominent,which should be prevented and taken seriously.Furthermore,the comprehensive evaluation of electrical properties based on insulation resistance,partial discharge,and depolarization current can effectively explore the damping process and identify the moisture state,which can be applied to practical engineering to evaluate the damp problem of distribution network cables in warm damp environment.