X射线激励对SF<sub>6</sub>中直流针尖放电的影响

doi:10.19595/j.cnki.1000-6753.tces.181802

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Abstract The foreign scholars indicated that the X-ray could conspicuously excite partial discharge (PD) of tiny air voids in solid insulation. In order to probe into the practicability of this method for needle discharge in SF₆, a PD test platform based on real 252 kV gas insulated switchgears (GIS) was built and the common needle discharge model in GIS was designed. Then, through the ultra-high frequency (UHF) method, the discharge characteristics of the needle discharge model under the direct current (DC) voltage induced by X-ray were measured. The PD tests were based on the specific needle defect with 50μm curvature radius and 15mm length. The results show that X-ray can reduce the partial discharge inception voltage (PDIV) by about 28.6% and 15.6% under positive and negative DC voltages, significantly increase discharge counts for about 5.3 to 17.0 times under positive voltage and about 80.4 to 166.7 times under negative voltage respectively, and reduce the UHF signal amplitude by about 35.3% under positive voltage. Finally, the possible mechanism is that X-ray can ionize SF₆ near the needle and the photoionization can provide sufficient electrons, which will reduce the time lag of gas discharges and lower the PDIV correspondingly. The results show that the PD in SF₆ can be regulated by the X-ray and this method is meaningful to the detection of insulation defects in DC GIS and GIL.

Key words： X-ray needle defect DC voltage partial discharge ultra-high frequency

Received: 20 November 2018 Published: 30 December 2019

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	Zhang Qiang
	Zhang Hanchi
	Li Chengrong
	Ma Guoming

Cite this article:

Zhang Qiang,Zhang Hanchi,Li Chengrong等. Impact of X-Ray on Needle Discharge in SF₆ Under DC Voltage[J]. Transactions of China Electrotechnical Society, 2019, 34(24): 5282-5288.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.181802 OR https://dgjsxb.ces-transaction.com/EN/Y2019/V34/I24/5282

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