摘要
在120kV的重复频率(10Hz,100Hz,500Hz,1000Hz)脉冲高压下,研究了干燥空气在平板间隙(5～15mm),气压(0.1～0.5MPa)下的击穿特性。得到了击穿时延、重复频率耐受时间、施加脉冲个数等与重复频率的关系,并观察到相关的发光现象。结果表明经典的流注击穿判据不符合重复频率脉冲下的击穿,高重复频率下的击穿与低重复频率下的击穿不同。重复频率的纳秒脉冲下的击穿需要考虑受激粒子、残余电荷等在放电过程的影响。亚稳态受激粒子、空间残余电荷的积累效应产生大量的初始电子,从而气体击穿是大量初始电子引燃,多弧道的击穿。
Breakdown characteristics of parallel-plate gaps above one atmospheric air were investigated under repetitive nanosecond-pulses with 120 kV. Relations among breakdown time delay, repetitively stressing time, number of applied pulses to breakdown, and repetition rates are presented, moreover luminous phenomena are observed. The conventional streamer criteria may not be applicable to the breakdown with repetitive nanosecond-pulses. The 'Memory effect' of metastable excited species and residual ions from previous pulses should be taken into account. Due to the large number of initiatory electrons produced by residual charges and excited particles, nanosecond-pulse gaseous breakdown under high pulse repetition frequencies (PRF) is multi-channel arc discharge with multi-electron initiation.
出处
《电工技术学报》
EI
CSCD
北大核心
2005年第7期44-49,62,共7页
Transactions of China Electrotechnical Society
基金
国家863计划
国家自然科学基金重点项目(50437020)
国家自然科学基金资助项目(50207011)
关键词
气体放电
重复频率脉冲
击穿特性
Gas discharge,repetitively nanosecond pulses,breakdown characteristics
