摘要
针对带长连续电流多重回击作用下金属氧化物避雷器(MOA)故障失效的问题,该文基于场-路耦合计算方法,研究了雷电绕击500kV直流输电线路时,长连续电流、回击幅值、回击次数和间隔时间对MOA温升特性的影响,并分析了考虑热累积效应和侧面闪络后,带长连续电流多重回击作用下MOA的温升变化。结果表明:长连续电流及多重回击间隔时间对MOA温升的影响较小,10次回击作用下MOA的最大温升可达到150.7℃,考虑热累积效应后,最大温升增大了6.6℃左右;多重回击作用下,当MOA出现单节侧闪故障时,长连续电流会使故障处电弧难以熄灭,从而导致MOA温度迅速升高,更易出现热崩溃。
For the problem of metal oxide arrester(MOA)failure under the action of multiple return-strokes with long continuous current,based on the field-circuit coupling calculation method,the effects of long continuous current,amplitude of return-strokes,number of return-strokes and the interval time of multiple return-strokes on the temperature rise characteristics of the MOA are studied when the lightning strikes the 500kV DC transmission lines.The temperature rise of MOA under the action of multiple return-strokes with long continuous current is analyzed after considering the thermal accumulation effect and surface flashover.The results show that the long continuous current and the interval time of multiple return-strokes have little effect on the temperature rise of MOA,and the maximum temperature rise of MOA can reach 150.7℃under the action of 10 return-strokes.After the thermal accumulation effect is considered,the maximum temperature rise increases by about 6.6℃.In the process of multiple return-strokes,when the single section surface flashover fault of the MOA occurs,the continuous current will make the fault arc unable to extinguish,which will cause the MOA temperature to rise rapidly and the thermal collapse is more likely to occur.
作者
黎鹏
肖盼
屈莹莹
王宇
普子恒
吴田
Li Peng;Xiao Pan;Qu Yingying;Wang Yu;Pu Ziheng;Wu Tian(College of Electrical Engineering and New Energy China Three Gorges University,Yichang 443002 China;Hubei Provincial Engineering Technology Research Center for Power Transmission Line China Three Gorges University,Yichang 443002 China;NARI Group Corporation(State Grid Electric Power Research Institute),Nanjing 211106 China;Wuhan NARI Limited Company State Grid Electric Power Research Institute,Wuhan 430074 China;Hubei Key Laboratory of Power Grid Lightning Risk Prevention,Wuhan 430074 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2020年第S02期603-611,共9页
Transactions of China Electrotechnical Society
基金
国家电网公司总部科技项目(524625180018)
三峡大学学位论文培优基金项目(2020SSPY056)资助。
关键词
多重回击
长连续电流
金属氧化物避雷器
热累积效应
温升
Multiple return-strokes
long continuing current
metal oxide arrester(MOA)
thermal accumulation effect
temperature rise
