固定悬浮体的放电现象及机制  

Discharge Phenomena and Mechanism of Fixed Suspensoid

作　　者：李凯曼 杨楚[2] 叶齐政[2] 

机构地区：[1]广东电网有限责任公司揭阳供电局,广东揭阳522000 [2]华中科技大学电气与电子工程学院,湖北武汉430074

出　　处：《广东电力》2015年第3期56-60,共5页Guangdong Electric Power

基　　金：国家自然科学基金资助项目(51177059)

摘　　要：研究了两种悬浮导体方式对空气中局部放电现象的影响。板-尖-板悬浮放电方式发现放电来自悬浮针尖且有极性效应,来自针尖的正电晕电流大,负电晕电流小,但放电均发生在电压上升段;其主要机制是前次放电发生后在悬浮针上积累的电荷抑制随后的放电,但会触发电压反转后的放电,这类似于介质阻挡放电壁电荷作用。尖-尖-板悬浮放电方式发现容易出现局部击穿且极性效应不明显,但放电也发生在电压上升段,其主要机制也类似介质阻挡放电壁电荷作用。实验结果表明,悬浮针尖积累电荷的大小和极性是决定悬浮放电的关键因素,也说明这些电荷在半周期内的泄漏程度会影响后续放电。This paper studies affect of two suspended conductor modes on partial discharge（PD）in the air.It was discovered that discharge came from the suspended needle and there was polar effect by means of plate-needle-plate mode.The positive corona current was large from the needle while the negative corona current was small but discharge happened in the process of voltage rising.The main mechanism of this phenomena was that stored charge on the suspended needle might restrain subsequent discharge after the previous discharge but discharge after voltage reversal might be triggered.This was similar to role of medium obstructing discharge wall charges.It was discovered by needle-needle-plate mode that partial breakdown was likely to occur and polar effect was not obvious,but discharge also happened in the process of voltage rising.The main mechanism of the phenomena was similar to role of medium obstructing discharge wall charges as well.Experimental results indicate that the sizes and polarities of stored charges on the suspended needle are key factors deciding suspended discharge and leakage degrees of the charges in half cycle may affect subsequent discharge.

关 键 词：悬浮缺陷 局部放电 极性效应 积累电荷 

分 类 号：TM855[电气工程—高电压与绝缘技术]