金属氧化物避雷器漏电流传感器的设计

Design of Sensor for Leakage Current of MOA

现有的金属氧化物避雷器漏电流传感器使用光纤传输数据时,采用的是电压信号传输的方式。传输的电压信号和漏电流成比例。由于信号幅值不恒定,存在传输距离短、效率低等问题。同时,现有的避雷器漏电流传感器一般采用外供电源方式,外供电源方式当雷电进入时会有被打坏的可能;若采用电池供电,由于电池有一定寿命,需要定时更换。为此介绍了一种自取电源,能适合光纤传输的,传输距离远,效率高的避雷器漏电流传感器。能精确地将避雷器上的漏电流转换为频率和漏电流大小成正比的光脉冲信号。经过多个变电站应用,效果良好。

The voltage signal transmission mode is used when the existing metal-oxide surge arrester （MOA） of lightning arrester leakage current to transmit data using optical fiber. The transmission voltage signal in proportion to the leakage current. There is a problem of short transmission and low efficiency because of the amplitude of the signal is unsteady. The existing sensor of lightning arrester leakage current generally adopt the power supply mode, It may be damaged when lightning entry. When powered by battery, The battery needs to be replaced timing due to its certain life, Thus a kind of sensor of arrester leakage current, which is without external power supply; have long transmission and high efficiency, is introduced. The leakage current of lightning arrester is converted accurately to the optical pulse signal, of which the frequency is proportional to the leakage current. It has a good effect after the application of muhiple substations