直流电压下SF<sub>6</sub>/N<sub>2</sub>混合气体沿面局部放电特性

doi:10.19595/j.cnki.1000-6753.tces.190762

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Abstract Due to the greenhouse effect of SF₆, more and more scholars are paying attention to the application of SF₆/N₂ mixed gas as the insulating medium in DC GIL. The surface defect is one of the common defects of GIL, so it is of great significance to study the partial discharge characteristics of SF₆/N₂ mixed gas under DC voltage. In this paper, the discharge signal is statistically counted by the pulse current method, and the initial partial discharge characteristics and the statistical characteristics of the discharge development stage of the mixed gas are studied. The results show that, when the pressure is in the range of 0.1~0.8MPa, as the pressure increases, the partial discharge inception voltage (PDIV) and the synergistic effect of the mixed gas increase, while the maximum discharge decreases. As SF₆ content decreases, the PDIV increases, the sensitivity of PDIV growth rate to SF₆ gas content decreases, and the synergistic effect of the mixed gas decreases. When the applied electric field is in the range of PDIV to 40kV, the average discharge amount increases in the low-pressure region with the increase of the applied electric field, and the increase in the high-voltage region with the applied electric field remains unchanged. The discharge repetition rate of the 50% SF₆ mixed gas in the high-pressure region is higher than that in the low-voltage region, and the formation of discharge is suppressed as the discharge develops. The surface discharge has a polar effect, and the negative PDIV is smaller than the positive PDIV.

Key words： DC voltage gas insulated line SF₆ N₂ mixed composition partial discharge

Received: 25 June 2019

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TM855

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	Articles by authors
	Hou Zhiqiang
	Guo Ruochen
	Li Junhao

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Hou Zhiqiang,Guo Ruochen,Li Junhao. Partial Discharge Characteristics of the Surface Discharge in SF₆/N₂ of the Mixed Gas Under DC Voltage[J]. Transactions of China Electrotechnical Society, 2020, 35(14): 3087-3096.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.190762 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I14/3087

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