电网不对称条件下小电流接地系统接地相辨识

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Abstract When a single-line-to-ground fault happens in the power grid, it is complex and difficult to determine the ground phase especially in the case of an unsymmetrical voltage and a large transition resistance. And the unsymmetrical voltage is often ignored because of simplified analyses in the previous literature. In this paper, with these factors considered a detailed analysis of the single-line-to-ground fault and the phasor diagram of the line-to-neutral voltages are presented firstly. It is concluded that the trajectory of the neutral voltage is no longer a semi-circular, but a circular arc. What is worse, in some cases it is not suitable to apply the traditional criterions that the previous literature proposed. A new method of constructing three new “phase” vectors is presented to identify the ground phase. Theoretical analyses and simulations show that the method can overcome the shortcomings of traditional methods and determine the grounding phase accurately.

Key words： Unsymmetrical voltage transition resistance neutral voltage phase voltages ground phase

Received: 13 May 2010 Published: 10 March 2014

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TM773

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	Xu Bo
	Zhang Jianwen
	Cai Xu
	Guan Shanlian
	Yao Yong

Cite this article:

Xu Bo,Zhang Jianwen,Cai Xu等. Grounding Phase Determination in Non-Effective Grounding Systems in Case of Unsymmetrical Voltage[J]. Transactions of China Electrotechnical Society, 2011, 26(12): 175-182.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2011/V26/I12/175

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