8/20µs Lightning Current Impulse Fuse Breaking Performance
Li Xiangchao, Zhou Zhongshan, Wang Chengfang, Chen Rongjian, Chen Puyang
Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration Nanjing University of Information Science and Technology Nanjing 210044 China
In terms of the fuse breaking performance in 8/20μs waveform of lightning current, the method that the fuse and surge protective device can work together is proposed. When the lighting current flows through the fuse, the instant temperature of its melt stream rises, and the fuse breaking action time is first analyzed. Meanwhile, when lighting current flows through a conductor, the influence of ponderomotive force on current-carrying conductor is then analyzed. Finally, a lead aluminum alloy fuse is selected, and the impulse test is carried out using 8/20μs waveform of lightning current. The test conforms to let-through energy I2t theory when the fuse melting current under power frequency is below 5A; while it conforms to the theory that the applied force vector sum of the transverse electric field and all directional drift electrons are ponderomotive force, when the fuse melting current under power frequency is above 5A.
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2015, Vol. 30 
