护套线过电流诱发短路故障起火过程及痕迹特征  

The process and trace of cables breakdown induced by overcurrent

作　　者：余韬 刘义祥 李阳 高阳 YU Tao;LIU Yi-xiang;LI Yang;GAO Yang(Graduate School,China People's Police University,Heibei Langfang 065000,China;Institute of Forensic Science,China People's Police University,Heibei Langfang 065000,China)

机构地区：[1]中国人民警察大学研究生院,河北廊坊065000 [2]中国人民警察大学物证鉴定中心,河北廊坊065000

出　　处：《消防科学与技术》2022年第1期142-145,共4页Fire Science and Technology

摘　　要：为深入研究RVVB护套线发生过电流诱发短路故障的火灾危险性,搭建RVVB护套线过电流诱发短路故障电路实验平台,探究短路故障起火过程及痕迹特征,对过电流诱发短路故障初次短路发生时间、起火特征及痕迹特征进行研究。结果表明:当I≥45 A时,护套线会出现短路击穿现象,并引发明火燃烧;当I=66 A时,过电流诱发短路故障平均时间由I=45 A的1803.4 s缩短至52.8 s,明火燃烧时间呈现波动上升趋势,由16.4 s升高至28.96 s,火灾危险性增大;护套线发生过电流诱发短路故障会产生圆珠状、半圆状、尖状、连接珠状、凹坑状、断口状、叠加珠状等短路熔痕以及直径大小不一的短路熔珠。研究结果可对过电流诱发短路故障起火机理及熔痕识别提供理论基础。In order to study the fire risk of short-circuit fault caused by overcurrent of electric RVVB wire,this paper built a test platform for RVVB wire overcurrent induced short-circuit faults,and studied the fire process and trace of short circuit fault.The initial short circuit occurrence time,combustion characteristics and trace characteristics when the RVVB wire was short-circuited were studied.The results showed that when I≥45 A,the RVVB wire will appear short circuit breakdown phenomenon and cause open fire combustion;When I=66 A,the average time of short-circuit fault induced by over-current is shortened from 1803.4 s of I=45 A to 52.8 s,and the combustion time of open fire fluctuates from 16.4 s to 28.96 s,which increases the fire risk;The short-circuit fault induced by overcurrent in the RVVB wire will produce arc fusion marks such as sphere shape,semicircle shape,pointed shape,joint shape,pit shape,fracture shape,and overlapping shape,as well as splashing fusion marks with different diameters.The research results can provide a theoretical basis for the ignition mechanism of short circuit fault induced by over-current and the identification of weld marks.

关 键 词：RVVB护套线 过电流 短路故障 起火过程 

分 类 号：X928.7[环境科学与工程—安全科学] D918.91[政治法律—法学]