一种氧化锌避雷器泄漏电流测试仪的设计

Design of Testing Device for Monitoring Leakage Current from Zinc-Oxide Surge Arrester

针对氧化锌(ZnO)避雷器泄漏电流的测试问题,利用数字型光电隔离传输电路,设计了一种光电传输及频率测量系统。该系统能满足测试仪与主电路间电气隔离的要求,较好地测量避雷器阀片泄漏电流的峰值。同时,在功耗方面采用了锁相环(PLL)电压-频率-窄脉冲变换原理及其微功耗机制。

Aiming at the testing problem of leakage current from ZnO surge arrester, a kind of photoelectric transmission and frequency measuring system is designed using photoelectric isolation transmission circuit. This system can satisfy the requirement of electrical isolation between testing device and main electric circuit, and also measure the peak value of leakage current from the value sheets of ZnO surge arrester. At the same time, PLL voltage-frequency-narrow pulse transform principle and micro-energy consumption mechanism are adopted in energy consumption.