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Behaviour of positive conductor-rod gaps stressed by impulse voltages in atmospheric air

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4 Author(s)
D. E. Gourgoulis ; Dept. of Electr. & Comput. Eng., Aristotelian Univ. of Thessaloniki, Greece ; P. N. Mikropoulos ; C. A. Stassinopoulos ; C. G. Yakinthos

Results were obtained and evaluated so as to investigate the influence of various parameters on the breakdown mechanism of a 50 cm positive conductor-rod gap under impulse voltages. For such a gap it was found that several parameters affect its breakdown characteristics, notably humidity, waveshape of the applied impulse, diameter of the energised conductor and position of the earthed rod with respect to the conductor. Breakdown probability curves have been established, gap factors computed and their dependence on the aforementioned parameters investigated. Finally, the paths taken by the spark channel have been studied. Based on the information gained several suggestions concerning the breakdown mechanism are proposed

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IEE Proceedings - Science, Measurement and Technology  (Volume:144 ,  Issue: 5 )