直流开断中MOV均衡特性选配方法研究  

Research on MOV Equilibrium Characteristic and Selecting Method in DC Fault Interruption

作　　者：龙辰 肖宇 杨飞[1] 吴益飞[1] 吴翊[1] 荣命哲[1] 杨景刚 陈庆 LONG Chen;XIAO Yu;YANG Fei;WU Yifei;WU Yi;RONG Mingzhe;YANG Jinggang;CHEN Qing(State Key Laboratory of Electrical Insulation and Power Equipment,School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Electric Power Research Institute of State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 211103,China;State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 210024,China)

机构地区：[1]西安交通大学电气工程学院电力设备电气绝缘国家重点实验室,西安710049 [2]国网江苏省电力公司电力科学研究院,南京211103 [3]国网江苏省电力有限公司,南京210024

出　　处：《高压电器》2023年第12期1-9,共9页High Voltage Apparatus

基　　金：国家重点研发计划(2018YFB0904700)。

摘　　要：金属氧化物压敏电阻(metal oxide varistor,MOV)广泛应用于各种直流断路器中,用于抑制过电压、系统能量耗散与开断电压建立。受目前加工工艺限制,单MOV阀片通流能力有限,故断路器中多采用多柱并联结构。柱间电流分配不均会导致局部阀片超负荷耗能,造成开断失败甚至设备损坏。文中基于实验测量建立了一种直流开断工况下的MOV电气模型,基于该模型提出了MOV阀片均流选配方法。经实验验证,传统基于雷电冲击测试方法选配的MOV在直流开断工况的均流特性不能完全满足要求,基于本文模型所选配的MOV在直流开断工况下可以实现良好的均流特性。Metal oxide varistor(MOV)is widely used in various DC circuit breakers for over-voltage suppression,system energy dissipation and set-up of breaking voltage.However,the single MOV disc,due to the limitation of current processing technology,is limited in the current flow capacity.Therefore,the multi-column parallel structure is mostly used in circuit breakers.The uneven current distribution between columns will lead to overload and energy consumption of local MOV,resulting in failure of breaking and even equipment damage.In this paper,an electrical model of MOV under DC breaking condition is set up on the basis of experimental measurements.Based on this mod-el,a method of MOV current sharing matching is proposed.It is verified by the experiment that the current sharing characteristics of the MOV,which is matched on the basis of traditional lightning impulse test method,can not fully meet the requirements in the DC fault interruption condition.The MOV which is matched on the basis of this paper can achieve good current sharing characteristics in the DC fault interruption condition.

关 键 词：金属氧化物压敏电阻(MOV) 避雷器 直流断路器 均衡特性 选配方法 

分 类 号：TM561[电气工程—电器]