局部放电电磁波在GIS中的衰减特性

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Abstract Ultra-high frequency (UHF) electromagnetic waves (EM-waves) excited by partial discharge (PD) in gas insulated switchgear (GIS) can hardly be applied effectively to evaluate the PD source signal level as the EM-waves are affected by the GIS structure. For studying the influence of GIS structure on the EM-wave signals, the attenuation characteristics of EM-waves in different parts of GIS are investigated by using FDTD method in this paper and the spacer attenuation characteristic in actual GIS is studied with UHF sensors. The simulation results show that EM-wave signal amplitude will decrease a lot as the disperse effect of high order modes in coaxial waveguide, but the energy propagation is hardly affected. The EM-wave attenuation of the insulator which is near PD source is more serious than other insulators. EM-wave amplitude and energy both attenuate a lot when it pass L branch, but TEM mode attenuates a little. The attenuation of EM-wave in plumb way is more serious than straight way when signals propagate through the T branch.

Key words： Gas insulated switchgear partial discharge electromagnetic wave amplitude attenuation energy attenuation

Received: 14 January 2009 Published: 04 March 2014

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TM83

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	Articles by authors
	Liu Junhua
	Xu Minhua
	Huang Chengjun
	Guo Canxin
	Yao Linpeng
	Jiang Xiuchen

Cite this article:

Liu Junhua,Xu Minhua,Huang Chengjun等. Investigation on the Attenuation Characteristics of Electromagnetic Waves in GIS[J]. Transactions of China Electrotechnical Society, 2010, 25(8): 52-58.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2010/V25/I8/52

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