快脉冲同轴场下间距变化的闪络分析  

Analysis on Flashover With Varying Gap Between Inner and Outer Electrodes Under Nanosecond Pulsed Coaxial Electric Field

作　　者：黄文力[1,2] 崔建锋[1] 孙广生[2] 

机构地区：[1]郑州航空工业管理学院机电工程学院,郑州450015 [2]中国科学院电工研究所,北京100190

出　　处：《电工技术学报》2011年第2期39-43,共5页Transactions of China Electrotechnical Society

基　　金：河南省科技攻关计划项目(092102210129)

摘　　要：在纳秒脉冲同轴电场下,尼龙1010的闪络电压随着内、外电极半径差近似线性增长,且外加脉冲陡度越大,其闪络电压越高。纳秒脉冲下的沿面闪络特性与固体-液体-电极三结合点处的场强及沿面电位梯度分布紧密相关,内、外电极半径差越大,虽然三结合点处场强提高程度越严重,沿面电位分布越不均匀,但是内电极表面场强急剧降低,综合导致沿面闪络电压随着内、外电极半径差近似线性提高。分析表明,当同轴结构内、外电极半径差足够大时,同轴电场的平均闪络场强可以用均匀电场的平均闪络场强来估算。Under nanosecond pulsed coaxial electric field,surface flashover voltage over interfaces between nylon 1010 and transformer oil almost linearly increases with gap length,and the steeper rising edge of pulse,the higher flashover voltage.Surface flashover properties are closely related to the electric field at the triple junctions of solid-liquid-electrode and the field gradient along the interfaces.Although the greater difference between inner and outer electrode radii enhances electric field strength at the triple junctions and nonuniformity of potential distribution along interfaces,it simultaneously terribly reduces the surface field strength of coaxial inner electrode,so that flashover voltage doesn＇t decrease but almost linearly increases with gap length.It is indicated the average flashover strength in coaxial electric field can be estimated by that in uniform electric field for large enough gap.

关 键 词：纳秒脉冲 同轴电极 间隙距离 沿面闪络 三结合点 沿面电位 

分 类 号：TM85[电气工程—高电压与绝缘技术]