Observation of Leader Discharges in UHV Engineering Real-Size Air Gaps under Switching Impulse under Two Kinds of Humidity
Liu Chang1,2, Zhou Xuan3, Zhuang Chijie3, Liu Lei4, Zeng Rong3
1. School of Electric Power South China University of Technology Guangzhou 510640 China 2. China Southern Power Grid Guangzhou 510663 China 3. State Key Lab of Power Systems Department of Electrical Engineering Tsinghua UniversityBeijing 100084 China 4. China Southern Grid (CSG) Electric Power Research Institute Guangzhou 510663 China
Abstract:The determination of air gap distances is one of the main issues in the external insulation design of UHV transmission systems. In this paper, a synchronized observation system was set up to obtain the detailed processes of large engineering gap discharges, and the tests of UHV real-size gaps breakdown under switching impulse voltages were carried out at the test bases in Beijing and Wuhan. The results indicate that the absolute humidity has significant influence on leader propagation. Leaders propagate continuously when the absolute humidity is low (experiments in Beijing), and the average velocities under different applied voltages are relatively smaller (1.6cm/μs to 2.1cm/μs) with little fluctuation. On the contrary, leaders propagate discontinuously with frequent re-illumination processes when the absolute humidity is high (experiments in Wuhan), and the average velocities are relatively higher (4.5cm/μs to 6.5cm/μs) with large fluctuation
刘昌, 周旋, 庄池杰, 刘磊, 曾嵘. 两种湿度下特高压尺度真型工程间隙操作冲击放电试验观测[J]. 电工技术学报, 2019, 34(10): 2239-2246.
Liu Chang, Zhou Xuan, Zhuang Chijie, Liu Lei, Zeng Rong. Observation of Leader Discharges in UHV Engineering Real-Size Air Gaps under Switching Impulse under Two Kinds of Humidity. Transactions of China Electrotechnical Society, 2019, 34(10): 2239-2246.
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