过电流对线缆绝缘破坏的影响  

Influence on insulation damage of cable by over-current

作　　者：舒中俊[1] 李丽[1] 张克俭[1] 陈南[1] 吴莹 高伟 

机构地区：[1]中国人民武装警察部队学院,河北廊坊065000 [2]公安部沈阳消防研究所,辽宁沈阳110034

出　　处：《消防科学与技术》2012年第5期450-453,共4页Fire Science and Technology

基　　金：公安部重点研究计划项目"电气火灾基础试验与物证痕迹物相分析技术的研究"(2009ZDYJSYXF027)

摘　　要：采用自行设计的过电流电线绝缘电阻监测装置研究不同环境条件下过电流对电线绝缘破坏的影响。结果表明,随着过电流增大,电线绝缘失效和击穿的时间明显缩短,其变化趋势具有很强的指数函数关系;在给定的过电流条件下,环境湿度增大、散热不利均会缩短电线绝缘失效和击穿的时间。A new monitoring device for the insulation resistance of over-current wire was used to realize the measurement of insulation resistance change of the live wire in different environments.The results showed that the relation between insulation failure time and current size,insulation breakdown time and current size both accord with exponential decay function;under the given over-current,the greater the environment humidity and the worse the radiation condition,the shorter the insulation failure and breakdown time.

关 键 词：过电流 线路故障 绝缘失效 绝缘击穿 

分 类 号：X913.4[环境科学与工程—安全科学] TM247[一般工业技术—材料科学与工程]