基于环探头测量含运动导体的瞬态电流波形

电流除了用罗果夫斯基线圈进行测量外,还可通过环探头测量电流产生的磁场来计算得到。直线电机除了位置固定的母线导体外,还有沿母线运动的电枢;母线回路注入脉冲电流后,电枢会被加速而运动。简化母线和电枢为线电流模型,在长线模型基础上,通过环探头测量得到的磁场计算出近似电流波形。因为探头所测磁场主要由其附近电流所贡献,所以合理配置电枢起始位置与探头位置后,电枢运动对电流测量的影响很小。在瞬态电流上升沿、平台区和下降沿的不同阶段,利用实验折算的系数,可得到时域瞬态电流波形,其测量结果与用罗果夫斯基线圈测量波形一致。

The Measurement and Analysis of Pulsed Current Waveforms with Moving Conductors Using a Loop Probe

In addition to using the ROGOWSKI probe to measure the transient current,the currents can also be measured by the magnetic loop probes.The transient currents of the linear generator are measured,which accelerate the armatures to a high speed.The line current models are used to describe the current situations,and the transient currents can be measured by the loop probe.Because the measured magnetic field is mainly contributed by the nearby currents,it is little relationship between transient current waveforms and the moving armature in certain cases.In order to get the probe coefficient for variable current waveforms,the coefficient is analyzed separately for the rising,flat and falling period of the current waveform.The experimental results show that the currents measured by the loop probe are consistent with the currents measured by the calibrated ROGOWSKI probes.