Transfer Function Characterization for HFCTs used in Partial Discharge Detection
Transfer Function Characterization for HFCTs used in Partial Discharge Detection
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DOI：
10.1109/tdei.2017.006115
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发表时间：
2017-04-01
影响因子：
3.1
通讯作者：
Peng, Xiaosheng
中科院分区：
文献类型：
--
作者：
Hu, Xiao;Siew, W. H.;Peng, Xiaosheng
高频电流互感器（HFCT）被广泛用于检测高压设备中的局部放电（PD）感应电流。本文介绍了HFCT的宽带传递函数的测量，使其对检测到的脉冲形状在先进的局部放电测量应用的影响可以被表征。基于脉冲响应的时域方法是表示HFCT传递函数的有用方式，因为它允许传感器的正向和反向传递函数的数值确定。然而，虽然该方法在高频下是准确的，但在低频下可能具有有限的分辨率。在本文中，一个复合时域方法，允许在低和高频率的HFCT传递函数的准确表征。在两种不同的高频电流互感器上进行了测试，结果表明，该方法可以表征其传递函数从几kHz到几十MHz。结果被发现是在良好的协议与频域测量高达50 MHz。总结了使用该方法的测量程序，以方便进一步的应用。
High frequency current transformers (HFCTs) are widely employed to detect partial discharge (PD) induced currents in high voltage equipment. This paper describes measurements of the wideband transfer functions of HFCTs so that their influence on the detected pulse shape in advanced PD measurement applications can be characterized. The time-domain method based on the pulse response is a useful way to represent HFCT transfer functions as it allows numerical determination of the forward and reverse transfer functions of the sensor. However, while the method is accurate at high frequencies it can have limited resolution at low frequencies. In this paper, a composite time-domain method is presented to allow accurate characterization of the HFCT transfer functions at both low and high frequencies. The composite method was tested on two different HFCTs and the results indicate that the method can characterize their transfer functions ranging from several kHz to tens of MHz. Results are found to be in good agreement with frequency-domain measurements up to 50 MHz. Measurement procedures for using the method are summarized to facilitate further applications.