多层轴向绝缘堆的电压电流测量

为获取初级试验平台(PTS)装置分层真空轴向绝缘堆的电压电流,设计、标定了微分型电容分压器和微分环。探头的频响实验表明:绝缘堆电压、电流探头的频响上限分别为270MHz和100MHz。两种探头均采用在线标定方法来确定幅值灵敏度系数。电压探头在标定时应当保留绝缘堆外侧的水介质,以保证探头附近电场分布不发生改变。PTS装置的实验结果表明:当装置外围馈入电流基本均匀时,绝缘堆电压电流测量结果与相关测试结果自洽,与理论值基本符合;当馈入绝缘堆的电流分布不均匀时,不同角向探头测量结果的偏差导致总电流计算结果的误差较大。

Voltage and current measurement for multi-level vacuum insulator stack

Differential-output capacitive divider(D-dot probes) and current loops (B-dot probes) were designed and calibrated to derive vacuum insulator stack voltage and current in the PTS facility. Frequency response experiments indicated that the D-dots upper limiting frequency was 270 MHz and B-dots was 100 MHz. All the monitors were calibrated in-situ. The water outside the insulator stack was present to keep the distribution of D-dot probes electric field. The experimental results showed that the voltage and current of insulator stack were reasonable according to theoretical predictions. And the results of measurement and magnetically insulated transmission line(MITL) current were self-consistent. But large variations in the monitor signals which were contributed from asymmetric current distribution azimuthally compromised the accuracy of azimuthal averages calculated from the signals.