一起电压回路接线错误引起的保护误动分析研究

With the analysis of protection misoperation caused by the voltage circuit wiring error

介绍了某变电站一起低压减载保护动作跳闸事故情况,并对事故原因进行了分析,针对该起电压回路接线错误造成的继电保护误动作,提出了正确接线方式。分析得出由于接线错误造成采样小PT饱和,使得保护装置采样数据异常,从而导致低压减载保护误动作的结论。最后对该案例做了延伸介绍,对以后的工程实践具有指导意义。

This paper introduces protection tripping accidents for a substation,which because low voltage load shedding,and analyses the cause of the accident.In the view of the relay protection misoperation caused by the voltage circuit wiring error,this paper proposes the correct wiring.This paper arrive at the reason of voltage load shedding that sampling small PT saturation due to wrong wiring,makes the protective device sampling data is abnormal. Finally,the case makes a presentation extension,which has guiding significance for engineering practice.