| 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 |
| DOI： |
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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 |
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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 |
