自然雷电下氧化锌避雷器残压特征分析  

Analysis on Characteristics of Residual Voltage in ZnO SPD Based on Natural Lightning

作　　者：颜旭[1] 陈绍东[1] 江润志[1] 尹娜[1] 

机构地区：[1]广东省防雷中心,广东广州510080

出　　处：《中国电力》2013年第7期72-76,共5页Electric Power

摘　　要：对自然闪电条件下氧化锌避雷器的残压波形特征进行了分析。通过线路过电压和快电场的变化,对记录的12次自然闪电引起的避雷器残压波形进行了分析。分析结果表明,自然闪电条件下的避雷器残压持续时间约330μs,明显长于实验室用8/20μs波形电流冲击得到的几十微秒残压持续时间,波形宽度过长可能会造成压敏电阻体的熔化穿孔。其次,避雷器上残压波形与闪电放电过程紧密相关,具有较多的不规则性。此外,避雷器对前端埋地50 m的线路过电压有一定的抑制作用,对闪电首次回击引起的过电压抑制作用较弱,对继后回击引起的过电压抑制作用较强。The waveform characteristics of residual voltage in ZnO surge protective devices （SPD） based on natural lightning is investigated. Analyzing the waveform characteristics of SPD results from 12records of natural lightning through the variation of the line over-voltage and fast electric field. The results show that the duration of residual voltage for SPD is about 330μs on the condition of the natural lightning, which is longer than the value of dozens of microseconds generated by the standard 8/20μs test waveform current in the laboratory, and the piezoresistor can be melted and punctured if the current of excessive wide waveform is used . Secondly, the waveform of residual voltage in SPD with the major irregular characteristic is closely related to the lightning discharge. Furthermore, there is some inhibition effect on the over-voltage of the 50m front-end underground line by the SPD. The inhibition effect is weak during the first return stroke, but strong during the subsequent return stroke.

关 键 词：残压 氧化锌避雷器 雷电 过电压 

分 类 号：TM862[电气工程—高电压与绝缘技术]