| 基于时域反射法的航空导线绝缘故障检测与分析 |
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| 引用本文： | 张俊民,魏娟,谢华博,曹大树,姚红宇.基于时域反射法的航空导线绝缘故障检测与分析[J].航空学报,2009,30(4):706-712. |
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| 作者姓名： | 张俊民 魏娟 谢华博 曹大树 姚红宇 |
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| 作者单位： | 1. 北京航空航天大学,自动化科学与电气工程学院,北京,100191
2. 中国民用航空总局,航空安全技术中心,北京,100028 |
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| 基金项目： | 民航安全技术分析和鉴定实验室开放研究基金(200603) |
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| 摘 要： | 基于时域反射法（TDR）建立了航空导线绝缘故障的数学模型及相应的仿真模型，计算与分析航空导线的绝缘层沿径向发生变化时其特征阻抗及反射系数的变化规律，仿真研究了脉冲波和阶跃波在导线中的传播规律，试验研究了导线特征阻抗的变化以及入射波上升时间对TDR波形的影响。结果表明:随着绝缘损坏量的增加，反射系数的变化率加快；对于相同的绝缘损坏量，绝缘层薄的导线反射系数大，易检测出来；在故障检测中阶跃波优于脉冲波；短路故障容易确定；特征阻抗降低到一定程度时，绝缘故障才能从TDR波形上辨别出来。对于小范围的绝缘故障检测，入射波上升时间越短，TDR波形越能反映故障的特征，但反射脉冲变窄，要求高采样频率；入射波上升时间增长，反射脉冲变宽，幅值降低，但一定程度上有利于检测出绝缘故障。
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| 关 键 词： | 航空导线 时域反射法 绝缘 入射波上升时间 特征阻抗 |
Detection and Analysis of Aerospace Wire Insulation Faults Based on TDR |
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| Zhang Junmin,Wei Juan,Xie Huabo,Cao Dashu,Yao Hongyu.Detection and Analysis of Aerospace Wire Insulation Faults Based on TDR[J].Acta Aeronautica et Astronautica Sinica,2009,30(4):706-712. |
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| Authors: | Zhang Junmin Wei Juan Xie Huabo Cao Dashu Yao Hongyu |
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| Institution: | 1.School of Automation Science and Electrical Engineering;Beijing University of Aeronautics and Astronautics;Beijing 100191;China;2.Center of Aviation Safety Technology of China;General Administration of Civil Aviation of China;Beijing 100028;China |
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| Abstract: | A mathematic model of aerospace wire insulation faults and its corresponding simulation model are presented based on time domain reflectometry (TDR) in this article. The characteristic impedances and reflection coefficients are calculated as they vary with the insulation thickness of aerospace wires. Transmissions in a wire are simulated for pulse wave and step wave respectively. The influences of characteristic impedance of a wire and the rise time of incident wave on TDR are studied experimentally. The re... |
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| Keywords: | aerospace wire time domain reflectometry insulation rise time of incident wave characteristic impedance |
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