一起机端断路器非全相合闸案例的分析与思考

本文介绍了一起带机端断路器(GCB)机组非全相合闸并网的实例,分析了并网前后的零序电压接地保护动作情况,对故障时GCB两侧电压特征量进行了理论分析,并结合实际录波数据进行了验证.通过分析与研究,提出了增设机端断路器非全相保护的必要性与可行性,给同类型接线方式的发变组运行维护提供参考,提升发电机安全运行水平.

Analysis and Reflection on a Case of Open-phase Closing on the Generator Circuit Breaker

This paper introduces an example of open-phase closing on the generator circuit breaker,through the analysis of the zero sequence voltage grounding protection before and after grid connection,The difference of voltage characteristics on both sides of GCB during the open-phase fault,and verified with the actual recording data.Through analysis and research,the necessity and feasibility of adding open-phase protection of the generator circuit breaker are put forward.It provides a reference for the operation and maintenance of generator transformer units with the same type of wiring mode.GCB open-phase protection is further Improving the safe operation level of generator.