电网故障行波传感器研究及测试

Research and experiments on the transmission characteristics of traveling wave sensor for power fault

传统的电容式电压互感器在高频段不具良好的响应特性,不能满足电压行波测量的相关要求,电压行波故障定位法的发展也因此受到一定限制。该文基于Rogowski线圈原理设计穿芯式行波传感器,其通过测量电容式电压互感器(CVT)的入地电流行波来检测线路电压行波,能有效传变线路电压行波信号,无需高速采集系统,可应用于电压行波故障定位装置。该文实验测试穿芯式行波传感器的传输特性,包括频率响应特性、高频暂态行波信号响应特性、工频特性、耐压特性以及抗干扰特性。实验结果表明:该传感器能有效传递10 kHz^2 MHz频率范围内的行波信号,从而防止接地线泄漏工频电流信号传递到二次侧,避免后续装置误动。

Since the traditional capacitive voltage transformer does not have good response characteristics in the high frequency band,and can not meet the requirements of voltage traveling wave measurement,the development of the voltage traveling wave fault location method is to some degree limited.Through core-type traveling wave sensor is designed according to the Rogowski coil principle in this paper.It can measure the current traveling-wave from CVT to ground and transfer voltage traveling-wave signals of transmission line effectively without high speed data acquisition.The designed sensor can be implemented in the fault location of voltage traveling wave.A variety of frequency response characteristics including frequency response,high-frequency transient traveling wave signal response,power frequency,withstand voltage and anti-interference of the designed sensor are tested in this paper.The testing results show that the sensor with excellent amplitude characteristics can efficiently transfer the traveling wave signal of frequency range from 10 kHz to 2 MHz.Therefore it can also further avoid maloperation of the protection by shielding the power frequency signal and preventing grounding leakage current transferring to the secondary of transformer.