Development of evaluation method of surface electric charge on electric insulation strength in composition high electric field gaps

我考察了一种用电荷充电的效果，以给出一种成分高电场间隙的电绝缘性能。两个主要研究考察了介质表面带电充电和浮动金属颗粒带电充电对电绝缘性能的影响。作为此类研究的重要结果，(1)直径达32 cm的亚克力圆盘上的电荷分布取决于亚克力圆盘的直径以及所加电压的大小和极性。(2)带电电荷分布的圆形充电中心的电荷自然衰减率很大，发现电荷从外围向中心落下。(3)当施加与带电充电相反的极性电压时，放电起始电压极大地降低。(4)当金属小颗粒插入直流准均匀高电场间隙中时，研究发现，由于带电和粒子的存在，电场强化使绝缘强度有较大的下降。(5)在闪络发生前，金属粒子的带电范围在100~800 pC之间。(6)通过考虑金属粒子表面电荷的模型数值分析，我们估计了击穿电压的异常降低，从这些结果可以看出，交流电压下的闪络电压将更多地被粒子的电荷降低。

I examined an effect of a charging with electricity electric charge to give electric insulation performance of a composition high electric field gap. Two main study examined what kind of influence electric insulation performance received by dielectric surface charging with electricity and floating metal particle charging with electricity.As important results given from such a investigation, it is as follows.(1) The electric charge distribution on the acrylic discs which is in diameter up to 32 cm depends on an acrylic disc diameter and also the de applied voltage magnitude and polarity.(2) Natural decrement rate of an electric charge in a center of circular charging with electricity electric charge distribution is large and finds that quantity of electric charge falls in a center from a peripheral department.(3) When we impressed the voltage of polarity reverse to a charging with electricity electric charge, the electric discharge onset voltage extremely decreases.(4) In the case of a small metal steel particle inserted to a dc quasi-uniform high electric field gaps, we found a large fall of electric insulation strength by the electric field reinforcement due to the electric charge and the presence of particle.(5) Just before the sparkover takes place, the metal particle has the electric charge in the range of 100 to 800 pC.(6) By model numerical analysis in consideration of the surface electric charge on the metal particle, we show that the abnormal reduction of the breakdown voltage has been estimated.From these results, the sparkover voltage under ac applied voltage would be much more reduced by the electric charge of the particle.