直流熔断器低过载电流燃弧不均现象机理研究  

Study on Mechanism of Uneven Arc Burning of DC Fuse with Low Overload Current

作　　者：毛启东 沈兵[1] 庄劲武[1] 董润鹏 MAO Qidong;SHEN Bing;ZHUANG Jinwu;DONG Runpeng(College of Electrical Engineering,Naval University of Engineering,Wuhan 430033,China)

机构地区：[1]海军工程大学电气工程学院

出　　处：《电器与能效管理技术》2019年第22期6-11,共6页Electrical & Energy Management Technology

基　　金：大容量中压混合型直流真空断路器限流分断技术研究(项目批准号51607184)

摘　　要：熔断器在低过载电流下,易出现熔体仅有部分狭颈燃弧的现象,严重影响熔断器的开断能力。针对这一问题,通过建立熔体燃弧数学模型及瞬态电热场模型,对熔体狭颈不同时起弧过程中的电流及狭颈温度进行计算,对熔断器在过载电流下燃弧不均现象进行了机理性分析,并利用模型讨论工艺误差、熔体宽度对燃弧不均现象的影响。仿真结果表明,减小加工误差或熔体宽度均能提升熔断器的低过载电流分断能力,相关结论可用于指导直流熔断器的优化设计。At low overload current,fuse is prone to the phenomenon of only part of narrow neck arc burning,which seriously affects the breaking ability of fuse.Aiming at this problem,through the establishment of the melt arc mathematical model and transient electric field model,the current and narrow neck temperature in the process of arcing are calculated,the phenomenon of uneven are burning at overload envvent is analyzed.The model is used to discuss the influence of the process error,melt width to arc uneven phenomenon.The simulation results show that reducing the melt width or machining error can improve the low overload current breaking capacity.The relevant conclusion can be used to guide the optimization design of DC fuse.

关 键 词：直流熔断器 低过载电流 燃弧不均 加工误差 

分 类 号：TM563[电气工程—电器]