发变组过励磁保护误动原因分析及处理措施

Misoperation Cause Analysis and Treatment of Over-excitation Protection of Generator-transformer Protection

介绍一起发变组过励磁反时限保护误动引起机组跳闸故障,通过对现场DCS系统指令及参数图、现场动作报告、保护装置校验等进行分析,确定发变组过励磁反时限保护基准值偏差引起保护误动,是导致机组跳闸的直接原因,并提出了针对性的处理及防范措施,避免类似故障发生。

This paper introduces an accident of generator-transformer over-excitation inverse time protection misoperation, through analysis on the DCS system instructions and parameter, action reports, protection device verification, identifies the cause of this misoperation are that the reference value deviation of the generator-transformer over-excitation inverse time protection causes the protection to malfunction, which is the direct cause of the unit trip. At last, proposes the preventive measures after the analysis to avoid similar faults.