高压并联电容器在线监测系统灵敏度及可靠性研究

Study on Sensitivity and Reliability of On-line Monitoring System for High Voltage Shunt Capacitors

高压并联电容器在长期运行中,由于缺陷、故障较多,而目前电网检修运行方式无法有效实现提前预判设备故障,以致易出现单台电容器故障扩大为整组故障,存在较大的设备安全运行隐患。因此提出了基于对温度值、电容值和不平衡电压进行检测的高压并联电容器在线监测方法,并对其灵敏度及可靠性进行了研究。运行结果表明该系统对提高电容器可靠性及防止发生电容器故障具有重要的实际意义。

There are many faults and defects of HV voltage shunt capacitors in the long running. The current mainte- nance and operation mode can not effectively predict equipment failure in advance. So a single capacitor fault is easy to expand to the group fault. This paper presents an on-line monitoring method of high voltage shunt capacitors which based on dectecting of temperature,capacitance values and unbalanced voltage. This paper also describes the princi- ple, structure of on-line monitoring system. The sensitivity and reliability of on-line monitoring system were studied. The operation result shows that the on-line monitoring system of high voltage shunt capacitors has important practical significance to improve the reliability of capacitors and prevent the occurrence of capacitor faults.