基于差动电压的并联电容器在线监测系统设计

针对近期宁波500 kV变电站内电容器组故障率偏高的情况，发现利用传统的运行维护措施已经无法满足电网对无功补偿电容器稳定运行的要求。充分利用在线监测原理，在不需要增加或改动一次设备的情况下，针对电容器差动电压变化值，通过后台软件的功能扩展和高级应用，设计了一套并联电容器在线监测系统。该系统可实现对无功补偿电容器组的故障预警和差动电压数据查询，为设备的状态检修提供数据支持。

Design of Online Monitoring System for Shunt Capacitors Based onDifferential Voltage

As faults have occurred to the capacitors of the 500 kV substations rather frequently these years in Ningbo Electric Power Bureau, the traditional operation and maintenance can hardly meet the requirements of the power grid for the stable operation of reactive power. In this paper, an on-line monitoring system for shunt capacitors is designed, based on the differential voltage of the shunt capacitor, by extension of backstage software functionality and advanced application without increasing or altering the primary system. The system can realize the failure alert for the reactive compensation capacitors and inquiry for the differential voltage data, providing data support for the equipment state maintenance.