引用本文: | 张 超,王 晨,庄劲武,徐国顺.基于电磁斥力开断器的直流限流熔断器设计方法与限流特性[J].电力自动化设备,2015,35(10): |
| ZHANG Chao,WANG Chen,ZHUANG Jinwu,XU Guoshun.Design method and current-limiting characteristics of DC-limiting fuse based on electromagnetic repulsion isolator[J].Electric Power Automation Equipment,2015,35(10): |
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摘要: |
在考虑短路分断特性和温升特性要求的基础上,得到了额定直流640 V/ 2 kA限流熔断器的性能指标设计约束条件,推导出了各性能指标的解析计算式和各组件参数的设计原则。分析了不同短路电流上升率下的限流特性,结果表明:介质恢复时间tz和起弧分断时间tp都随着短路电流di/dt的增大而减小,限流峰值Ip随着di/dt的增大而增大。为了进一步增加介质恢复时间和改善限流性能,采取了减小电弧触发器支路电感的方法,改进后的样机可将di/dt为8.3 A/μs的短路电流限制在22.2 kA,tp减小为3.3 ms,tz增加到600 μs,限流熔断器限流性能和可靠性得到了明显提高。 |
关键词: 电磁斥力 开断器 限流熔断器 介质恢复 |
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基金项目:国家自然科学基金资助项目(51307179,51207166) |
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Design method and current-limiting characteristics of DC-limiting fuse based on electromagnetic repulsion isolator |
ZHANG Chao1,2, WANG Chen1, ZHUANG Jinwu1, XU Guoshun1
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1.College of Electrical Engineering,Naval University of Engineering,Wuhan 430033,China;2.College of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China
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Abstract: |
According to the requirements of short circuit disconnecting characteristics and the temperature rising characteristics,the constraint conditions of performance specification design for DC 640 V/2 kA CLF(Current Limiting Fuse) are obtained,the performance index calculation formulas deduced and the component parameter design principles defined. The current-limiting characteristics are analyzed for different short circuit current rising rates (di/dt). The analytical results show:both the dielectric recovery time tz and the arc interrupt time tp decrease along with the increase of di/dt while the peak current Ip limited increases along with the increase of di/dt. The inductance of arc-trigger branch is reduced to further increase the dielectric recovery time and improve the current-limiting performance. The short circuit current with di/dt of 8.3 A/μs of the improved prototype is limited to 22.2 kA,tp reduced to 3.3 ms and tz increased to 600 μs,which show the current-limiting performance and reliability of CLF are obviously improved. |
Key words: electromagnetic repulsion electric isolators current limiting fuse dielectric recovery |