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首页> 外文期刊>IEEE Transactions on Dielectrics and Electrical Insulation >Comparison of on-line partial discharge detection methods for HV cable joints
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Comparison of on-line partial discharge detection methods for HV cable joints

机译：高压电缆接头在线局部放电检测方法的比较

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摘要

The capacitive coupler, acoustic emission (AE) sensor and radio frequency current transducer (RFCT) have been used to detect partial discharge (PD) activity within a 132 kV prefabricated cable joint containing a known defect. Although each of the three methods has been applied individually under different situations, a comprehensive investigation and comparison of these three methods has not yet been made. Results obtained were compared to measurements made using the conventional electrical detection method. The quantification of the capacitive coupler measured signal in mV with a discharge apparent quantity in pC has been investigated and an on-line quantification method proposed. The capacitive coupler has good detection sensitivity and PD location can be realised by studying the time of Right between signals from two sensors. The difference in pulse shape, spectrum and time of flight between an internal discharge and external interference has been investigated. The AE approach has the advantage of being free from electrical interference. However, investigation indicated that AE signals were significantly attenuated within the cable joint. RFCTs were used to detect the discharge current flowing through the cable sheath. Where the detection sensitivity was low, a wavelet de-noising method was applied to process the RFCT signals and proved to tie effective in increasing the measurement signal to noise ratio.
机译：电容耦合器，声发射（AE）传感器和射频电流换能器（RFCT）已用于检测包含已知缺陷的132 kV预制电缆接头内的局部放电（PD）活动。尽管这三种方法中的每一种都已分别在不同的情况下应用，但是尚未对这三种方法进行全面的调查和比较。将获得的结果与使用常规电检测方法进行的测量进行比较。已经研究了以mV为单位的电容耦合器测量信号的量化以及以pC为单位的放电表观量，并提出了一种在线量化方法。电容耦合器具有良好的检测灵敏度，并且可以通过研究来自两个传感器的信号之间的Right时间来实现PD定位。研究了内部放电和外部干扰之间的脉冲形状，频谱和飞行时间的差异。 AE方法的优点是不受电气干扰。但是，研究表明，电缆接头内的AE信号明显衰减。 RFCT用于检测流过电缆护套的放电电流。在检测灵敏度较低的情况下，采用小波消噪方法处理RFCT信号，并证明可以有效提高测量信噪比。

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