模拟故障电弧作用下高压电缆外护套引燃方法研究  

Study on the ignition method of the outer sheath of high voltage cables under the action of simulated fault arcs

作　　者：普子恒[1] 徐詹旗 郭卫 蔡静 Pu Ziheng;Xu Zhanqi;Guo Wei;Cai Jing(College of Electrical Engineering&New Energy,China Three Gorges University,Yichang Hubei 443002,China;Beijing Electric Power Research Institute,State Grid,Beijing 100075,China)

机构地区：[1]三峡大学电气与新能源学院,湖北宜昌443002 [2]国网北京电力科学研究院,北京100075

出　　处：《消防科学与技术》2025年第1期23-29,34,共8页Fire Science and Technology

基　　金：国家自然科学基金青年基金项目(51607103)。

摘　　要：为模拟外护套在故障电弧作用下的引燃过程,探究其引燃特性,提出了一种电极拉弧引燃模拟方法。基于燃弧过程能量平衡等式及试验数据,分析了电极速度与回路电流对燃弧稳定性的影响,确定了不同电流工况与电极速度和电弧功率的对应关系。结果表明,同等回路电流工况下,电极移动速度过快会导致燃弧时间更短,无法引燃外护套,而电极速度过慢会导致燃烧后的碳化物连通两极,电弧过早熄灭,燃烧持续时间短;不同回路电流工况下所对应电极速度存在一定范围,其速度上限与下限均与回路电流大小呈正相关;利用所确定回路电流与电极移动速度关系,以35 kV高压电缆本体为例,实现了外护套在电弧作用下的引燃模拟,表明了本文模拟方法能成功引燃高压电缆外护套并使其在电弧作用下持续燃烧。In order to simulate the ignition process of the outer sheath under the fault arc and investigate its ignition characteristics,this paper proposes an electrode arc ignition simulation method,based on the energy balance equation of the arc ignition process and experimental data,analyses the impact of the electrode speed and circuit current on the arc ignition stability,and determines the relationship between the different current conditions and the electrode speed and arc power.The results show that under the same circuit current condition,when the electrode moving speed is too fast,it will lead to a shorter arc ignition time and cannot ignite the outer sheath;while when the electrode speed is too slow,it will lead to the burning carbide connecting the two poles,and the arc will be extinguished prematurely,with a short combustion duration;there is a certain range of electrode speeds corresponding to different circuit current conditions,and both the upper limit and lower limit of the speed are positively correlated to the size of the circuit current.Using the relationship between the determined circuit current and the electrode speed,the simulation of the ignition of the outer sheath under the action of the arc is achieved by taking the 35 kV high-voltage cable as an example,which shows that the simulation method in this paper can successfully ignite the outer sheath of the high-voltage cable and sustained combustion occurs under the action of the arc.

关 键 词：电弧引燃 故障电弧 火源模拟 电缆火灾 

分 类 号：X932[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]