According to the requirements of accurate detection of the standard lightning current waveform characteristics in the national standard, two Rogowski coils with different structure parameters were designed.On the basis of in-depth analysis and calculation of the principle of coil measurement, the simulation and experimental study was carried out with the dynamic characteristics of the measurement.It is concluded that the measured current frequency range reached 50 Hz-394 MHz and 743 Hz-394 MHz for square and circular skeleton of the Rogowski coil respectively;the sensitivities of the coil square and the circular skeleton were 117 mV/kA and 111.3 mV/kA respectively.The actual test results show that, the lightning current sensor with two kinds of coil frame could detect the lightning current with rapid change, and exhibited good sensitivity and linearity.At the same time, the parameters of the coil designed with different structure were compared and analyzed.It is found that the lightning current sensor based on square frame exhibited smaller measurement error and wider lightning current frequency band.%通过对国家标准中标准雷击电流波形特性进行准确检测的要求,设计了方形和圆形2种结构参数不同的罗氏线圈.在深入分析和计算线圈测量原理的基础上,结合测量的动态特性进行了仿真和实验研究,可知方形和圆形骨架的罗氏线圈测得的电流频率范围分别为50 Hz~394 MHz和743 Hz~394 MHz,线圈骨架方形和圆形所测得的灵敏度分别为117 mV/kA和111.3 mV/kA,根据实际测试结果显示,所设计的2种线圈可测量各类快速变化的大幅值雷击电流,并具有较好的灵敏度和线性度.同时,对这2种结构形式不同的线圈设计的参数进行对比分析得知,方形骨架线圈比圆形骨架的测量误差小,方形骨架所测得的电流频率更宽.
展开▼
