高海拔地区500kV单回输电线路空气间隙放电特性

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Abstract In the actual condition of high altitude, the up-and-down method was employed to investigate the switching impulse and lightning impulse discharge characteristics of the gaps between the bundled conductors and the tower of 500 kV single-circuit transmission lne, the switching impulse and lightning impulse discharge curves were obtained with the gaps of 2～5.5 m, and several altitude correction methods were used to calibrate and analyze the results to obtain the correction methods which is appropriate for transmission project. The experiments show that 50% lightning impulse voltages and 50 % switching impulse voltages are declining with increasing the altitudes, but the trend and degree of changes has a little notable differences; and the influence of altitude on the switching impulse flashover voltage obtains weaker with increasing of switching impulse voltage. By discussing the switching impulse and lightning impulse discharge under different altitude correction methods, It is proposed in this paper that the appropriate method is suited for correct the switching impulse and lightning impulse of 500 kV single -circuit transmission line at high altitude. According to the above conclusions, this work has enriched the research of external insulation characteristics of 500 kV single-circuit transmission line in actual high altitude area and can provide technical support for the external insulation design, operation and maintenance of 500 kV single -circuit transmission projects in high altitude area in China.

Key words： High altitude 500 kV single-circuit transmission line I string of conductor switching impulse lightning impulse altitude correction

Received: 20 September 2012 Published: 25 March 2014

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TM852

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	Deng Wei
	Meng Gang
	Chen Yong
	Zhang Rui
	Huo Feng

Cite this article:

Deng Wei,Meng Gang,Chen Yong等. Flashover Characteristic for High Altitude 500 kV Single-Circuit Transmission Line[J]. Transactions of China Electrotechnical Society, 2013, 28(9): 255-260.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2013/V28/I9/255

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