THE STUDY ON MEASURING TECHNIQUE OF PARTIAL DISCHARGE IN GAS INSULATED SWITCHGEAR USING ULTRA HIGH FREQUENCY METHOD WITH EXTERNAL SENSORS

摘要

Objective In order to find early latent faults and prevent catastrophic failures, diagnosis of insulation condition by measuring technique of partial discharge(PD) in gas insulated switchgear (GIS) is applied in this paper, which is one of the most basic ways for diagnosis of insulation condition. Methods Ultra high frequency(UHF) PD detection method by using internal sensors has been proved efficient, because it may avoid the disturbance of corona, but the sensor installation of this method will be limited by the structure and operation condition of GIS.There are some of electromagnetic (E-M) waves leak from the place of insulation spacer, therefore, the external sensors UHF measuring PD technique is applied, which isn't limited by the operation condition of GIS. Results This paper analyzes propagated electromagnetic (E-M) waves of partial discharge pulse excited by using the finite-difference time-domain (FDTD) method. The signal collected at the outer point is more complex than that of the inner point, and the signals' amplitude of outer is about half of the inner, because it propagates through spacer and insulation slot. Set up UHF PD measuring system. The typical PD in 252kV GIS bus bar was measured using PD detection UHF technique with external sensors. Finally, compare the results of UHF measuring technique using external sensors with the results of FDTD method simulation and the traditional IEC60270 method detection. Conclusion The results of experiment shows that the UHF technique can realize the diagnosis of insulation condition, the results of FDTD method simulation and the result UHF method detection can demonstrate each other, which gives references to further researches and application for UHF PD measuring technique.

机译：目的为发现早期潜在故障并预防灾难性故障，本文采用气体绝缘开关柜（GIS）中局部放电（PD）测量技术对绝缘状况进行诊断，是诊断绝缘的最基本方法之一。绝缘条件。方法已证明使用内部传感器的超高频PD检测方法是有效的，因为它可以避免电晕的干扰，但是此方法的传感器安装受到GIS的结构和操作条件的限制。电磁波（EM）从绝缘垫片的位置泄漏出来，因此，采用了外部传感器UHF测量PD技术，不受GIS的工作条件的限制。结果本文采用时域有限差分法（FDTD）分析了部分放电脉冲的传播电磁波（E-M）。在外部点收集的信号比内部点更复杂，并且外部信号的幅度大约是内部信号的一半，因为它会传播通过垫片和绝缘槽。设置UHF PD测量系统。 252kV GIS母线中的典型局部放电是使用带有外部传感器的局部放电检测UHF技术进行测量的。最后，将使用外部传感器的UHF测量技术的结果与FDTD方法仿真和传统IEC60270方法检测的结果进行比较。结论实验结果表明，UHF技术可以实现绝缘状况的诊断，FDTD方法的仿真结果与UHF方法的检测结果可以相互证明，为UHF PD测量技术的进一步研究和应用提供了参考。

THE STUDY ON MEASURING TECHNIQUE OF PARTIAL DISCHARGE IN GAS INSULATED SWITCHGEAR USING ULTRA HIGH FREQUENCY METHOD WITH EXTERNAL SENSORS

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