发电机机端断路器非全相保护新型判据的研究  

Research on the new open-phase protection criterions of the generator circuit breaker

作　　者：贺儒飞 李荷婷 HE Rufei;LI Heting(Guangzhou Pumped Storage Power Station,Guangzhou 510950,China;Suzhou Power Supply Company,Suzhou 215004,China)

机构地区：[1]广州蓄能水电厂,广东广州510950 [2]苏州供电公司,江苏苏州215004

出　　处：《电力系统保护与控制》2018年第17期165-170,共6页Power System Protection and Control

基　　金：南方电网科技项目资助(K-ST2014-003)~~

摘　　要：2012年1月,某蓄能水电厂发电机在轻载运行时,发电机机端断路器(Generator Circuit Breaker, GCB)发生单相断线故障,而相关保护未能及时切除故障,导致故障范围扩大。针对此问题,通过比较分析现有的反时限负序电流保护和基于GCB两侧基波零序电压相角差的GCB非全相保护,提出综合零序电压和负序电流量的GCB非全相保护复合判据。考虑GCB两侧基波零序电压故障特征量的幅值、相位变化,提出基于零序电压比值和相量差的GCB非全相保护新型判据。这几种新型判据进一步完善了GCB非全相保护,可在相关电厂得到应用。In January 2012,a certain Pumped Storage Power Station once had a serious accident.The Generator Circuit Breaker(GCB)had the open-phase fault when the generator ran with low load.The relevant protection failed to remove the fault and led to expand the accident scope.Through the comparative analysis of the inverse time negative sequence current protection and the phase angle difference protection of the zero sequence fundamental voltages between GCB both sides,the comprehensive protection based on the zero sequence voltage and the negative sequence current is put forward for the open-phase fault.Considering the phase and amplitude features of the zero sequence fundamental voltages between GCB both sides,new criterions of the GCB open-phase protection based on the zero sequence voltage amplitude ratio and phasor difference are given.GCB open-phase protection is further optimized by these new protection criterions and can be applied in the relevant power plants.

关 键 词：发电机机端断路器 负序电流 基波零序电压 非全相保护 新型判据 

分 类 号：TM561[电气工程—电器]