D. James, I. Sauers, A. Ellis, M. Pace, D. Deschenes
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引用次数: 19
摘要
固体介质中封闭空隙内的压力通常是通过计算某一特定气体的局部放电(PD)起始电压与Paschen曲线的击穿电压相等来确定的。这里假定气体是已知的,或者物理性质大致保持不变。在本实验中,在环氧树脂中放置两个不同的大空隙,邻近含有小泵出端口的接地电极。这种布置允许直接测量和设置填充空隙的不同气体的压力。在室温下,氮气和SF/sub / 6的PD发生和熄灭电压是压强在13.3 Pa (0.1 torr)到101 kPa (760 torr)范围内的函数。起始电压与压力的关系基本符合Paschen曲线,但在最小压力附近电压较高,而熄灭电压与压力和电压的关系更接近Paschen曲线。在较高的压力下,与Paschen曲线的一致性较好。一种可能的解释是,在较低的压力下,真实的表面起着主导作用。
Effect of gas pressure on partial discharge in voids in epoxy
The pressure inside an enclosed void in a solid dielectric is generally determined by calculation based on equating the measured partial discharge (PD) onset voltage and the breakdown voltage from the Paschen curve for a particular gas. Here it is assumed that the gas is known or that physical properties remain approximately constant. In the present experiment, two different large voids were placed in epoxy adjacent to the ground electrode containing a small pump out port. This arrangement allowed for direct measurement and setting of the pressure for different gases filling the void. PD onset and extinction voltages were determined as a function of pressure over the range from 13.3 Pa (0.1 torr) to 101 kPa (760 torr) for nitrogen and SF/sub 6/ at room temperature. The onset voltages generally followed the Paschen curve dependence on pressure but were higher in voltage at pressures around the minimum, while the extinction voltage followed the Paschen curve more closely in both pressure dependence and voltage. Agreement with the Paschen curve is better at the higher pressures. One possible explanation is the dominant role that real surfaces play at lower pressures.