Numerical Research on Electromagnetic Wave in Ultra-High Frequency Band Excited by Partial Discharge in Electrical Equipment

doi:10.7652/xjtuxb201612005

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Numerical Research on Electromagnetic Wave in Ultra-High Frequency Band Excited by Partial Discharge in Electrical Equipment

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- Numerical Research on Electromagnetic Wave in Ultra-High Frequency Band Excited by Partial Discharge in Electrical Equipment
- Vol. 50, Issue 12, Pages: 24-31(2016)
- 作者机构：
  
  1. 西安交通大学电力设备电气绝缘国家重点实验室,西安,710049
  2. 国家电网浙江省电力公司电力科学研究院,杭州,310014
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201612005
  CLC： TM855
- Online First：10 December 2016，
  
  Published：2016
- 稿件说明：
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Numerical Research on Electromagnetic Wave in Ultra-High Frequency Band Excited by Partial Discharge in Electrical Equipment[J]. 2016, 50(12): 24-31.
DOI：

Numerical Research on Electromagnetic Wave in Ultra-High Frequency Band Excited by Partial Discharge in Electrical Equipment[J]. 2016, 50(12): 24-31. DOI： 10.7652/xjtuxb201612005.

摘要

利用时域有限差分法(FDTD)

采用单轴介质完全匹配层(UPML)作为理想的吸收边界条件

比较了UPML与完全匹配层(PML)边界条件的电磁波吸收效果

推导了相应数值离散方法和迭代过程。以气体绝缘全封闭组合电器(GIS)局部放电为例

基于M语言

建立了特高频电磁波仿真模型及编制了数值计算模型

探讨了数值稳定性条件和数值色散

对比研究了硬源和软源激励以及UPML和PML边界条件下的电磁波仿真差异

并仿真计算了GIS内部和泄露电磁波的传播特性及波导模式特性。计算结果表明:UPML边界条件对于电磁波的吸收效果好于PML; 金属和非金属缺陷产生的局部放电电磁波可分别用硬源和软源脉冲电流激励来模拟

硬源下电磁波峰峰值为软源下的5倍; GIS内部最大电场强度方向为垂直于GIS的行波方向

而泄露电磁波最大电场方向则平行于其行波方向

两者频谱与GIS波导模式基本吻合

两者差异主要是因盆式绝缘子与金属螺栓所形成的缝隙天线的自有频响特性所造成的。

Abstract

By finite difference time domain(FDTD)method with uniaxial perfectly matched layer(UPML)boundary condition

the comparison of the absorption effects between perfectly matched layer(PML)and UPML is performed

and the numerical discretization and iteration processes are deduced. Taking gas insulating switchgear(GIS)partial discharge(PD)as an example

the simulation model of electromagnetic(EM)wave is constructed

and the numerical stability condition and dispersion are discussed. The differences under hard source and soft source excitations are illustrated

and the GIS PD simulations at UPML and PML boundaries are also compared. It is revealed that the absorption of EM waves with UPML boundary condition is better than that with PML. The hard source and soft source of pulse current excitation can be employed to simulate the PD EM waves generated by metal and non-metal defects

respectively. The peak-peak value of EM wave under hard source is about five times larger than that under soft source. The largest electric field strength component inside GIS is perpendicular to the direction of travelling waves in GIS

and the largest electric field strength component of the leakage EM waves is along the direction of travelling waves in GIS. The main frequency spectrums of EM waves comply with the different waveguide modes in GIS. The difference between inside and leakage EM waves is caused by the self frequency response characteristic of the slot antenna formed by the insulating spacer and bolts.

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Keywords

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