Aiming at false wiring of negative sequence current relay, analyzes the reason, treatment and second loop grounding unreasonable of maloperation from practice and theory.

• 针对一起负序过电流继电器误解线的典型事故,对保护误动作的原因、处理方法及二次回路接地不合理等问题,从实践和理论方面进行了深入地分析。