用于电缆接头在线监测的高频电流传感器设计

Design of High Frequency Current Transducer for Online Monitoring of Cable Joint

基于Rogowski线圈原理建立了高频电流传感器(HFCT)等值电路,研究了HFCT的工作原理,在Matlab等平台对影响传感器灵敏度的因素进行了分析,结合电缆中间接头局部放电的特性,对接头的局部放电在线监测设计了一种小型便携HFCT。实验结果表明,所设计的传感器一致性良好,在100 kHz~5 MHz通频带内具有较高的增益和高度拟合的线性度,在工程上具有较强的实际应用价值。

Based on the principle of Rogowski coil,the equivalent circuit of high frequency current transducer(HFCT)is established,the working principle of HFCT is studied,the factors affecting the sensor sensitivity are analyzed in Matlab and other plaforms,and a small portable HFCT for online monitoring of partial discharge of the joint is designed in combination with the characteristics of partial discharge of the cable middle joint.The experimental results show that the designed transducer has good consistency,high gain and high fitting linearity in 100 kHz~5 MHz passband,and has strong practical application value in engineering.