低压电气接地故障引燃特性及痕迹特征研究

Research on ignition characteristics and trace characteristics of low voltage electrical ground faults

接地故障是引起电气火灾的重要原因之一,也是火灾调查中的难点问题。本文通过搭建低压电气接地故障试验平台,研究了两种不同形式接地故障的引燃特性,以及导线绝缘层和故障接触点在不同接地故障电流下的温升特性,分析了不同形式接地故障时空气开关动作特性、可燃物引燃特性及接地故障痕迹特征。研究结果可为接地故障电气火灾调查提供技术依据。

Ground fault is one of the main causes of electrical fire,and it is also a difficult issue in fire investigations.By building a low-voltage ground fault test platform,this paper studied the ignition characteristics of two different types of ground faults,as well as the temperature rise characteristics of the wire insulation layer and fault contact point under different ground fault currents,and analyzed the action characteristics of the air switch,the ignition characteristics of combustibles and the trace characteristics of the ground fault under different types of ground faults.The research results can provide technical support for the investigation of ground fault electrical fires.