中压开关柜在线监测装置的研制

针对中压开关柜,以温度、机械和绝缘状态为监测对象,研制开发了一套在线监测装置。设计了基于低功耗电子器件和红外通信的接触式测温装置,具有较高的准确度,并解决了高电位的隔离问题;采用角位移传感器间接测量动触头的行程-时间曲线,有效解决了直线位移传感器安装困难和高电位隔离的问题,结合操作过程中的振动信号和分合闸线圈电流曲线,实现了对中压开关柜机械特性的监测;通过测量断路器环氧套管的泄漏电流来表征绝缘特性。试验表明,整套在线监测装置稳定可靠。

Development of On-line Monitoring System of Medium Voltage Switchgear

For monitoring temperature,insulation and mechanism of medium voltage switchgear,an on-line monitoring system was developed.Based on the low power electronic devices and infrared communication,a contact-type temperature sensor with high precision was designed for the system to solve the problem of high voltage isolation.An angular displacement sensor was used to measure the travel-time curve of the movable contacts indirectly,leading to the solutions of the problems in sensor assembling and high voltage isolation.Furthermore,combining with the vibration signal and the current curve of tripping coils during operation,the monitoring of mechanism condition of medium voltage switchgear could be achieved.The insulation could be characterized by measuring the leakage current of bushing.The test indicates that the on-line monitoring system is stable and reliable.