±500kV龙泉换流站极Ⅰ极母线直流分压器故障导致直流系统闭锁原因分析

2009年2月26日龙泉站极I极母线直流分压器外绝缘闪络导致极I直流系统闭锁,而相同的情况曾在2004年江陵站发生。详细分析了该分压器外绝缘的配置情况及闪络原因,并对站内其它设备及2004～2009年三峡送出工程外绝缘的运行情况进行统计分析,得出应在后续工程中适当提高直流场设备外绝缘的设计值。

Analysis on DC System Block Caused by Pole Ⅰ Pole Busbar DC Voltage Divider Fault of±500 kV Longquan Converter Station

External insulation of Pole I Pole busbar DC voltage divider flashover happened in Longquan Converter Station on Feb 26th,2009 ,the same affair occured in Jiangling station in 2004. The paper analyses the extenal insulation setting and the reason caused its flashover of this divider,and analyses the operation conditions of other equipments in longquan station and other stations of Three Gorge output project at the same time,coming to the conclusion that it should raise the external insulation design value.