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Characteristics of partial discharge pulses propagation in shielded power cable

机译：屏蔽电缆中局部放电脉冲的传播特性

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摘要

Partial discharges originates from defects in the insulation material of shielded power cable, joints and machine coil. In cable the discharges induce small high frequency pulses which propagate to both cable ends and the time domain reflectometry detection method of the PD pulse is suitable in this case. In this paper, a new experimental method has been introduced, it consist to inject at one end of the power cable one high frequency pulse generated by negative corona discharge in point-plane system. Understanding high-frequency attenuation in transmission cable is relevant for PDs detection and wideband signals distributions over such cable. We have realized in laboratory a high frequency pulse generator and 50 m length of 30 kV XLPE power cable is used for the tests. The experimental results show that the pulse amplitude decreases and the pulse width increases with the propagated distance and this result is in good agreement with the actual theoretical analysis based on the frequency attenuation. Important characteristics of PD pulse are successively determined at high frequency with maximum accuracy possible such as the wave speed, the relative permittivity, the characteristic impedance and the XLPE attenuation factor.
机译：部分放电源于屏蔽电源电缆，接头和机器线圈的绝缘材料中的缺陷。在电缆中，放电会感应出小的高频脉冲，该高频脉冲会传播到电缆的两端，在这种情况下，PD脉冲的时域反射检测方法是合适的。本文介绍了一种新的实验方法，该方法包括在电源电缆的一端注入一个由点平面系统中的负电晕放电产生的高频脉冲。了解传输电缆中的高频衰减与PD的检测以及该电缆上的宽带信号分布有关。我们已经在实验室中意识到，高频脉冲发生器和50 m长的30 kV XLPE电力电缆用于测试。实验结果表明，脉冲幅度随着传播距离的增加而减小，脉冲宽度增大，与基于频率衰减的理论分析结果吻合良好。 PD脉冲的重要特性是在高频下以最大精度依次确定的，例如波速，相对介电常数，特性阻抗和XLPE衰减因子。

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