10 kV绝缘导线配电线路断线机理分析

在城市配电线路中,采用绝缘导线是当前城网改造的发展方向。绝缘导线配电线路有普通型及紧凑型2 种布置形式,其影响可靠性的主要因素是断线事故。普通型绝缘导线配电线路断线事故的主要原因是雷电引起绝缘子闪络,继发工频续流,烧断导线;紧凑型绝缘导线配电线路断线的原因是污秽和潮湿等引起绝缘子表面泄漏电流增大,导致导线起火燃烧,强度降低而被拉断。并针对上述成因,提出了防止绝缘导线断线的主要措施。

Analysis on Wire Breakage Mechanism of 10 kV Insulated Conductor for Distribution Lines

In the city power distribution lines application of the insulated conductor is the developing direction for retrofitting the urban power network at present.There are two kinds of arrangement(conventional and compact types)for insulated conductor distribution lines, whose main factor to effect on the reliability is the failures of wire breakage.The main cause for the failure of wire breakagein conventional type insulated conductor distribution lines is the insulator flashover caused by thunderstorm,followed by continuous current of working frequency and conductor burndown.The main cause for breakage in compact type insulated conductor distribution lines is that the dirt,wet and so on cause the increase of leakage current at the insulator surface,which results in firing and burnout of conductor and reduction of its strength,which results in wire breakage.Pointing to the previous factors the paper points out the main measures to prevent the insulated conductor from wire breakage.