一种基于光纤传输的宽频带冲击大电流测量系统的研究

A Measurement System for Broad Bandwidth High Impulse Current Based on Optical Fiber Transmission

特高压换流阀在实际运行中往往会受到雷电冲击过电压和操作冲击过电压的影响,为了检验换流阀在电力系统过电压作用下换流阀组件的均压效果,笔者开发了一套基于光纤传输的小尺寸、便携式冲击大电流测量系统,能很好地测量悬浮电位电流,其电流探头为开口式,测量时不需断开被测导线。其频带为140Hz～19MHz,灵敏度5mV/A,能测量300A以内的冲击电流,满足对大功率晶闸管阻尼回路电流测量的要求。试验结果表明,该系统能很好地测量处于高电压悬浮电位的晶闸管阻尼回路中的冲击电流。

A portable high impulse current measurement system was developed based on optical fiber transmission to verify the balancing effect of ultra-high voltage converter valves under over-voltage on electric power system.This measurement system can measure the current of floating potential,and its current probe is the open type without disconnecting the primary conductor in measurement.The frequency bandwidth of the present system is from 140 Hz to 19 MHz,its sensitivity is 5 mV/A,and its measuring range is up to 300 A,so it meets the requirements for the current measurement of the damping circuit in parallel with high power thyristor.Experiment indicates that the present system can measure the current in the damping circuit of high power thyristor under high voltage floating potential