Modeling of High-Frequency Current Transformer Based Partial Discharge Detection in High-Voltage Cables
Modeling of High-Frequency Current Transformer Based Partial Discharge Detection in High-Voltage Cables
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DOI：
10.1109/tpwrd.2019.2910076
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发表时间：
2019-08-01
影响因子：
4.4
通讯作者：
Sheng, Bojie
中科院分区：
文献类型：
--
作者：
Hu, Xiao;Siew, Wah Hoon;Sheng, Bojie
高压（HV）电缆和电缆附件的局部放电（PD）测试主要使用高频电流互感器（HFCT）作为PD传感器来实现。在PD源处发起的PD电流耦合到电缆导体上。它们远离PD源，并被安装在电缆终端的HFCT检测到。基于时域有限差分法（FDTD）建模和传递函数理论，提出了一种混合建模方法，用于研究高压电缆局部放电高频电流互感器（HFCT）检测中的耦合过程和检测过程。这种方法允许在电缆的FDTD模型中的任何地方激励PDevent，并预测来自某个距离外的HFCT的输出。使用11 kV XLPE电缆说明了该方法的实施。此外，“直接测量”的方法获得原始的局部放电脉冲作为激励源波形。这里介绍的建模方法将有助于研究测量的局部放电信号和局部放电源处激发的信号之间的关系，这可能会对电缆中局部放电检测的基本机制提供有用的见解。
Partial discharge (PD) testing of high-voltage (HV) cables and cable accessories has been implemented predominantly using high-frequency current transformers (HFCTs) as PD sensors. PD currents initiating at PD sources are coupled onto cable conductors. They travel away from the PD sources and are detected by HFCTs installed at cable terminations. In this paper, based on combining finite-difference time-domain (FDTD) modeling and transfer function theory, a hybrid modeling approach is proposed to investigate the processes of PD coupling and detection involved in HFCT-based PD testing of HV cables. This approach allows exciting a PDevent anywhere in FDTD models of the cables and predicting output from HFCTs some distance away. Implementation of the method is illustrated using an 11 kV XLPE cable. Moreover, a "direct measurement" method of obtaining original PD pulses as the excitation source waveform is presented. The modeling approach introduced here will facilitate studies on the relationship between measured PD signals and those excited at PD sources, which can potentially give useful insight into the basic mechanisms behind PD detection in cables.