纳秒脉冲下变压器油绝缘的击穿与闪络特性  

Breakdown and Flashover Characteristics in Transformer Oil Under Nanosecond Pulses

作　　者：周中升 章程[1,3] 邵涛[1,3] 杨文晋[1,3] 方志[2] 张东东[1,3] 

机构地区：[1]中国科学院电工研究所,北京100190 [2]南京工业大学自动化与电气工程学院,南京211816 [3]中国科学院电力电子与电气驱动重点实验室,北京100190

出　　处：《高电压技术》2014年第10期3290-3296,共7页High Voltage Engineering

基　　金：国家自然科学基金(11076026;51222701);国家重点基础研究发展计划(973计划)(2014CB239505-3)~~

摘　　要：纳秒脉冲下变压器油的绝缘特性是脉冲功率技术领域的关键问题之一。为此,利用NPC-120D型高压纳秒脉冲电源对该特性进行了实验研究,分别获得了1 mm间隙下变压器油的击穿和有机玻璃沿面闪络的实验数据。并采用等离子体射流对有机玻璃进行表面改性,比较了改性前后有机玻璃的沿面闪络电压。结果表明:在上升沿40 ns,脉宽100 ns的高压纳秒脉冲电源作用下,变压器油中1 mm击穿电压为120 kV,当加入绝缘介质有机玻璃后,在85 kV电压条件下发生了沿面闪络;利用等离子体射流处理后的有机玻璃在变压器油中的闪络电压显著提高,达到了120 kV。The insulation characteristics of transformer oil under nanosecond-pulse are a key issue in pulsed powertechnology. Hence, we experimentally researched the characteristics using an MPC-120D nanosecond-pulse power. Expe-rimental data of breakdowns in l-ram gap and surface flashover along PMMA surface in transformer oil were obtained.Furthermore, we also compared the flashover voltages of PMMA surface before and after treating the surface with plasmajet. The results show that the breakdown voltage of transformer oil in 1-mm gap is close to 120 kV when the applied vol-tage has a rise time of 40 ns and a full width at half maximum of 100 ns. The flashover voltage along untreated PMMAsurface in transformer oil is 80 kV, which is lower than that in pure oil. However, the flashover voltage along the treatedPMMA can be increased to 120 kV.

关 键 词：纳秒脉冲 变压器油 击穿 沿面闪络 等离子体 表面改性 

分 类 号：TM855[电气工程—高电压与绝缘技术]