摘要
氧化锌压敏电阻(MOV)和热脱离保护装置是限压型电涌保护器(SPD)的核心部件,直接决定SPD的安全性能。深入分析这2个部件的失效模式,总结出部件设计需要考虑的参数因子十分必要。本文通过试验研究了MOV在最大持续工作电压Uc下工作温度升高、冲击电流过大及暂态过电压3种情况下的故障模式,并在MOV故障模式下对热脱离保护装置进行性能试验,得出提高限压型SPD安全性的措施:(1)选择匹配的MOV(包括通流能力和残压、高温稳定性、过大冲击电流下工频耐受能力、暂态过电压耐受能力);(2)设计可靠的热脱离保护装置(包括材料属性、取热点位置、脱扣距离、脱扣力及其焊接工艺、增加内置式过电流保护装置等)。
Metal Oxide Varistor（MOV）and thermal tripping protection device are core components in voltage-limiting SPDs,which directly determine the safety performance.It is necessary to summarize the factors that are considered in the design of components by analyzing the failure modes of these two parts in depth.In this paper,the three failure modes of MOV are studied,including the elevated working temperature under Uc,over large pulse current,and transient overvoltage.The performance of thermal tripping protection device was tested under the MOV fault mode.The measures of improving the safety of SPDs are summarized,choosing the appropriate MOV（including the capacity of current and residual voltage,high temperature stability,the endurance of power frequency under over-large impulse current,the tolerance under transient over-voltage）,designing the right thermal tripping protection with reliable technical parameters（including material properties,hot spots,tripping distance,tripping force and welding process,adding over current protection device,etc.）.
作者
李征
游志远
刘岩
Li Zheng;You Zhiyuan;Liu Yan(Lightning Monitoring and Protection Center of Jiangsu Province,Nanjing 210009;Yangzhou Meteorological Service,Jiangsu,Yangzhou 225003;Meteorological Disaster Prevention Center of Anhui Province,Hefei 230061)
出处
《气象科技》
2018年第4期792-798,共7页
Meteorological Science and Technology
基金
江苏省气象局青年科研基金项目(Q201505)
安徽省气象局新技术集成重点项目(AHXJ201401)资助
