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Study on Propagation Characteristics of Partial Discharge Electromagnetic Wave in Gas Insulated Switchgear

机译：气体绝缘开关柜中局部放电电磁波的传播特性研究

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The ultra-high frequency(UHF) method is the most commonly used method for on-site partial discharge(PD) detection in gas insulated switchgear(GIS). The primary premise of this method is to know the transmission of electromagnetic wave in GIS. According to the actual structure of 1100kV GIS, a cylindrical calculation model with a total length of 5m is established by using finite element simulation software. Considering the advantages and disadvantages of various discharge sources, the electric point dipole model is used as the internal discharge source of GIS. In the simulation, the Gauss pulse current with pulse width of 0.7ns and amplitude of 15mA is used as the excitation of the discharge source. The distribution and transmission of electromagnetic waves at different locations are studied, and the influence of the amplitude and pulse width of discharge source on electromagnetic wave signal is discussed. The results show that with the increase of time, the electric field norm of the detection point decreases slowly in the fluctuation, and the change of the electric field norm has a certain time lag; the smaller the pulse width of the excitation source, the higher the amplitude of the electric field norm; the larger the pulse width, the slower the attenuation of the electromagnetic wave.
机译：超高频（UHF）方法是气体绝缘开关设备（GIS）中局部放电（PD）现场检测的最常用方法。该方法的主要前提是了解GIS中电磁波的传输。根据1100kV GIS的实际结构，利用有限元仿真软件建立了总长度为5m的圆柱计算模型。考虑到各种放电源的优缺点，将电偶极子模型作为GIS的内部放电源。在仿真中，脉冲宽度为0.7ns，幅度为15mA的高斯脉冲电流被用作放电源的激励。研究了电磁波在不同位置的分布和传输，讨论了放电源的幅度和脉冲宽度对电磁波信号的影响。结果表明，随着时间的增加，检测点的电场范数在波动中缓慢下降，电场范数的变化具有一定的时滞。激励源的脉冲宽度越小，电场范数的幅度越高;脉冲宽度越大，电磁波的衰减越慢。

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