110 kV及以上电力电缆系统故障统计分析

Statistical Analysis on Failures of 110 kV and Above Power Cable System

随着电力电缆技术的不断成熟以及电缆附件新技术的不断更新,高压电缆线路的故障特点及各故障原因占比已发生了较大变化。本文通过对南方电网在2006—2016年间发生的132起110 kV及以上电缆系统故障及文献查阅的99起故障案例进行详细统计,全面分析了近年来高压电缆系统的故障特征及其主要原因。统计结果表明:相比2001年,目前南方电网高压电缆线路运行可靠性明显提高,故障率下降了约一个数量级;电缆附件已成为目前高压电缆线路的最大薄弱环节,在不计及外力破坏时,电缆附件故障占比高达85.5%;对于电缆本体,70%以上的故障是由于外力破坏造成,而对于电缆附件故障,84%以上是由于产品质量和施工安装不当引起。该统计分析结果可为制订电力电缆系统差异化运维策略提供依据。

With the maturity of power cable technology and updating of new technology of cable accessories, the failure characteristics of high voltage cable systems and fault causes have changed significantly. In this paper, detailed statistics are carried out for the characteristics and fault cause proportions of 132 failures for 110 kV and above power cable in China Southern Power Grid （CSG）during 2006 and 2016, and 99 failures in the literatures, and the fault characteristics and main reasons of the high voltage cable system in recent years are analyzed. The statistical results show that the present operation reliability of high-voltage cable system in CSG has been improved significantly, while the failure rate has decreased by an order of magnitude compared to 2001. Cable accessories have now already become the weakest part of high-voltage cable systems, the failures of which account for as high as 85.5 % without taking external damage into account. For cable, more than 70% of the cable failures are due to external damage, while more than 84% cable accessories failures are due to product quality and improper installation. The statistical result of power cable system can provide a basis for the development of differentiated operation and maintenance strategy.