一起500 kV开关误跳闸事故分析

断路器失灵保护作为断路器拒动的后备保护,提高了系统运行的可靠性,但是由于失灵保护涉及到联跳其他设备,其误动会给系统带来极大的威胁。分析了一起由于二次人员误接线引起的500kV开关跳闸事故。500kV变电站内二次保护复杂,联跳回路众多,技改施工时极易影响到其它运行设备。本次事故虽然是由于二次人员误接线导致,但分析其跳闸过程可以为今后施工过程中的注意事项提供一些合理的建议。

Analysis of failure element maloperation of a 500 kV power station

The protection of break failure improves the reliability of power system by its supporting function. But the system is threatened by the failure operation because this kind of protection can conduce to the trip of other units. This paper analyzes a failure protection maloperation of a 500 kV power station caused by error connection. The relay protection and trip circuit of such station is so complicated that other operation equipments are easily effected by its reconstructing work. This accident is caused by incorrect connection, but the analyzing progress can give some useful advice for reconstruction.