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Study on breakdown delay characteristics based on high-voltage pulse discharge in water with hydrostatic pressure

Yan D., Bian D. C., Ren F., Yin C. Q., Zhao J. C., Niu S. Q.

Journal of Power Technologies

2017

Vol. 97, nr 2

89--102

Significant breakdown delay occurs during high-voltage pulse discharge in water with hydrostatic pressure; this phenomenon contributes to an assessment of the stability of discharge. Monitoring discharge effect is also an important approach in engineering. However, only a few studies have reported related influencing factors. This study established an equivalent circuit of a high-voltage pulse discharge based on gasification-ionization of plasma channels to study characteristics of high-voltage pulse discharge breakdown in water with high hydrostatic pressure. Simulation calculation of channel resistance was conducted using experimental data under different hydrostatic pressure and voltage conditions. The discussions in this paper center on the influencing mechanisms of hydrostatic pressure and voltage in breakdown delay. The results show that higher voltage leads to shorter breakdown delay. Equivalent resistance decreases with increasing voltage. High voltage can enhance the degree of ionization in plasma channels, which accelerates the velocity of the ionization current, shortening breakdown delay. Higher hydrostatic pressure results in longer breakdown delay. Equivalent resistance increases with increasing hydrostatic pressure. High hydrostatic pressure inhibits section areas of the plasma channel, slowing down the velocity of the ionization current and prolonging breakdown delay. This study provides theoretical guidance for monitoring analysis of high-voltage pulse discharge in engineering and studies on breakdown delay characteristics in pulse discharges.