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

我检查了充电的效果与电力电荷给予组成高电场间隙的电绝缘性能。两项主要研究考察了电介质表面带电和漂浮金属颗粒带电对电绝缘性能的影响，作为这两项研究的重要结果，如下所述。(1)直径达32 cm的丙烯酸圆盘上的电荷分布取决于丙烯酸圆盘直径以及所施加电压的大小和极性。(2)具有电荷分布的圆形充电的中心处的电荷的自然减少率大，并且发现中心处的电荷量从外围部福尔斯下降。(3)当我们施加极性相反的电压给一个带电电荷充电时，放电起始电压大大降低。(4)在将金属钢颗粒插入直流准均匀高电场间隙的情况下，发现由于带电和颗粒的存在，电场增强会使电绝缘强度大幅下降。(5)就在火花放电发生之前，金属颗粒具有100至800 pC范围内的电荷。(6)通过考虑金属颗粒表面电荷的模型数值分析，估计了击穿电压的异常降低，由此可知，在交流电压作用下，金属颗粒表面电荷将使放电电压大大降低。

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.