连续冲击电流脉冲下避雷器阀片电气性能研究  

Research on the Electrical Performance of ZnO Varistors under Multiple Impulse Current Pulse

作　　者：蔡力 田汭鑫[1,2] 魏俊涛 周蜜 王建国 Cai Li;Tian Ruixin;Wei Juntao;Zhou Mi;Wang Jianguo(Engineering Research Center of Lightning Protection&Grounding Technology Ministry of Education Wuhan 430072,China;School of Electrical Engineering and Automation Wuhan University Wuhan 430072,China;Guangdong Grid Electric Power Research Institute Guangzhou 510000,China)

机构地区：[1]雷电防护与接地技术教育部工程研究中心,武汉430072 [2]武汉大学电气与自动化学院,武汉430072 [3]广东电网有限责任公司电力科学研究院,广州510000

出　　处：《电工技术学报》2023年第S01期168-176,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(52177154)。

摘　　要：自然界中大部分闪电都包含多次回击过程,连续雷击容易造成避雷器劣化及损坏。该文使用不同电流幅值、脉冲间隔、冲击次数的连续雷击对五种不同尺寸的避雷器阀片进行试验,研究了避雷器阀片在连续雷击下的电气性能。结果表明:不同的冲击时间间隔(10、50、100 ms)下避雷器阀片的电气性能变化差别不大,在ms量级的冲击间隔时间下阀片散热可忽略不计,可视作为绝热过程;雷电流的幅值和冲击次数对避雷器阀片的电气性能有较大影响,冲击电流幅值越高,冲击次数越多,避雷器阀片的伏安曲线下移越明显,直流参考电压减小越显著,残压略微增加;温度是影响阀片性能的重要因素,温度越高,阀片性能劣化越严重,再次受到冲击后的劣化速度也会加快;避雷器阀片的温升与吸收能量和质量的比值呈现显著线性关系。According to natural lightning observation and artificially triggered lightning observation,most of the ground lightning events contain multiple return strokes.Compared with a single large current pulse,multiple lightning strokes will cause much more serious damage to the power system.However,contrary to the actual situation,the ex-factory inspection test of the MOA is only conducted for a single current impact,at the same time the existing standard only stipulates the ability of the MOA to withstand a single impact even though the MOA is the most important and widely used lightning protection measure in the power system,which has led to frequent accidents in the actual operation of the MOAs that have passed the ex-factory inspection.Therefore,it is very necessary to carry out relevant multiple lightning stroke experiments on lightning arresters.In this paper,the multi pulse generator platform is used to carry out multi pulse impact tests for ZnO varistors of different sizes from two manufacturers suitablefor 110 kV,220 kV and 500 kV power systems.In the experiment,by changing the amplitude of multi-impulse current,the time interval between pulses and the number of impulses,the performance of the ZnO varistors under the action of multi pulse current with different parameters was studied;At the same time,the influence of the temperature of ZnO varistors on its electrical performance is also studied.The results show that there is little difference in the electrical performance of the ZnO varistors at different impact intervals(10 ms,50 ms,100 ms),and the heat dissipation of the arrestors at millisecond impact intervals is negligible,which is regarded as an adiabatic process.The amplitude of lightning current and the number of impulse currents have a great influence on the electrical performance of the arrester.The higher the amplitude of the impulse current,the more the number of impulse currents,the more obvious the DC reference voltage decreases,and the residual voltage slightly increases.Temperature is an import

关 键 词：氧化锌避雷器阀片 连续雷击试验 电气性能 温度 

分 类 号：TM863[电气工程—高电压与绝缘技术]