摘要
详细描述了一起线路光差保护误动的案例,通过对现场相关保护动作报告和故障录波进行分析,得出误动原因是由于线路一侧CT传变电流不正确引起,经过现场检查发现是CT工艺问题导致故障时CT一次分流,两侧产生差流使保护误动。并给出建议以避免同类事故的发生。
A case of 220kV line fault trip is introduced in the paper. By analysing the report of protection devices and the waveforms, the reason for the accident is founded： incorrect transform of CT. Through inspection it is found that the CT causes distributary of prime side of the CT. It is helpful to the other units in dealing with similar problems.
出处
《江西电力》
2011年第3期17-19,共3页
Jiangxi Electric Power
关键词
电流互感器
分流
光差保护
误动
current transformer
distributary
relay protection device
fault trip
