一起同塔双回直流输电线路避雷器击穿事故原因分析  

Analysis of a Lightning Arrester Breakdown Accident on a Double Circuit DC Transmission Line on the Same Tower

作　　者：陈慧 刘宁[1] Chen Hui;Liu Ning(QuJing Bureau of CSG EHV Power Transmission Company,QuJing 655000,China)

机构地区：[1]中国南方电网公司超高压输电公司曲靖局,云南曲靖655000

出　　处：《云南电力技术》2023年第4期60-64,共5页Yunnan Electric Power

摘　　要：同塔双回四极高压直流输电线路在提高线路走廊利用率的同时,会增加发生共因故障、相继跳闸的概率。该文结合某±500 kV同塔双回直流输电线路相继跳闸事故,阐述了直流系统共因故障的发生经过,分析了直流输电线路避雷器损毁的原因,即直流双极相继跳闸导致系统发生了两次暂态过电压,避雷器累计吸收能量超出额定值,导致避雷器热崩溃击穿。最后从避雷器动态巡维、在线监测及阀片筛选等方面提出了预防建议,为类似避雷器设备损毁的原因分析与解决提供了思路。The double circuit four pole high voltage direct current transmission line on the same tower not only improves the utilization rate of the line corridor,but also increases the probability of common cause faults and subsequent trips.This article elaborates on the occurrence of common cause faults in the DC system based on the successive tripping accident of a±500 kV double circuit DC transmission line on the same tower,and analyzes the reasons for the damage of the lightning arrester on the DC transmission line.The subsequent tripping resulted in two transient overvoltages in the system,and the accumulated absorbed energy of the lightning arrester exceeded the rated value,leading to the thermal collapse and breakdown of the lightning arrester.Finally,preventive suggestions were proposed from the aspects of dynamic maintenance,online monitoring,and screening of lightning arrester valve plates,providing ideas for analyzing and solving the causes of damage to similar lightning arrester equipment.

关 键 词：同塔双回 直流输电 相继跳闸 共因故障 避雷器 

分 类 号：TM74[电气工程—电力系统及自动化]