特高压同杆双回线的环流不平衡及其影响

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Abstract Double-circuit transmission line is a trend for development of ultra high voltage (UHV) transmission system. The paper analyzes the wire layout of double-circuit line and characteristics of its impedance matrix. And then the sequence currents of double-circuit line are investigated. The paper points out that besides through unbalanced current, there are distinct circulating current when double-circuit line is in normal operation or external fault occurs. Furthermore, the circulating current is influenced by wire layout and external fault. Based on the simulation and verification of UHV double-circuit transmission line, the paper calculates the circulating unbalanced degree and investigates the influence of circulating unbalanced current on protection relaying and line losses.

Key words： Ultra high voltage (UHV) double-circuit transmission line unbalanced current zero-sequence circulating current relay protection

Received: 11 November 2010 Published: 20 March 2014

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TM772

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	Li Bin
	Li Xuebin
	Ding Maosheng
	Bo Zhiqian

Cite this article:

Li Bin,Li Xuebin,Ding Maosheng等. Circulating Unbalanced Current and Its Influence of Double-Circuit UHV Transmission Lines[J]. Transactions of China Electrotechnical Society, 2012, 27(4): 202-208.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2012/V27/I4/202

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