一种中压开关柜绝缘子泄漏电流在线监测装置的设计

Design of an Online Monitoring Device of Insulator Leakage Current of Medium Voltage Switchgear

介绍了一种中压开关柜绝缘子泄漏电流在线监测装置的设计方法,给出了装置总体设计方案,详细介绍了放大电路、滤波电路、信号调理电路及电磁兼容设计,并采用低电压作用下的等效阻容网络测试了该装置的性能。当装置输入4V左右正弦波时,输出电压为2.2～3.8V,输出电流为10～14mA,均满足设计要求,且电压和电流波形匹配良好;在一定的相移前提下,该装置的输出波形与实测波形基本一致,表明其能够实现中压开关柜绝缘子泄漏电流的在线监测功能。

The paper introduced a design scheme of online monitoring device of insulator leakage current of medium voltage switchgear, gave whole design scheme of the device, introduced designs of amplifying circuit, filtering circuit, signal processing circuit and electromagnetic compatibility in details, and tested performances of the device by use of equivalent resistance-capacitance network under low voltage. When sine wave of 4 V is as input of the device, the output voltage is 2.2-3.8 V and the output current is 10-14 mA, which both meet design requirement and match pretty well in waveform. Besides, the output wave of the device is as the same as the measured wave under condition of certain phase shift, which shows that the device can realize function of online monitoring of insulator leakage current of medium voltage switchgear.