换流站并联电容器不平衡保护动作分析及其改进  

Analysis and improvement on unbalanced protection action of shunt capacitor in converter station

作　　者：孟腾龙 赵庆杰 杨晨 陈瑞 崔鹏 MENG Tenglong;ZHAO Qingjie;YANG Chen;CHEN Rui;CUI Peng(Maintenance Company of State Grid Ningxia Electric Power Co.,Ltd.,Yinchuan Ningxia 750011,China)

机构地区：[1]国网宁夏电力有限公司检修公司

出　　处：《宁夏电力》2019年第4期32-36,共5页Ningxia Electric Power

摘　　要：针对银川东换流站在直流升功率操作过程中,SC并联电容器组自动投入后不平衡保护动作跳闸的问题,深入分析不平衡保护动作的正确性及其跳闸原因,提出了对选相分合闸装置的改进措施,使其能够通过检测开关电流通断瞬间来自适应地调整断路器预期操作时间,从而减小或消除投切过程中所产生的涌流和瞬态过电压,保护高压电气设备不受损坏。Aiming at the problem of unbalanced protection action trip after SC shunt capacitor set is automatically put into operation during DC power up operation in Yinchuan Eastern Converter Station,the correctness of unbalanced protection action and the reasons of trip are analyzed in detail,and the improvement measures of selecting phase separation and closing device are put forward.It can adjust the expected operating time of the circuit breaker by detecting the moment of switching current,so as to reduce or eliminate the inrush and transient overvoltage generated during the cutting process,and protect the high-voltage electrical equipment from damage.

关 键 词：并联电容器组 不平衡保护 选相分合闸 内熔丝 

分 类 号：TM53[电气工程—电器]