1　前言　　近年来 ,我国电力部门、供电部门和用电量较大的工矿企业 ,因电缆着火延燃酿成火灾时有发生 ,给国民经济带来较大损失。电缆火灾事故无论是由外界火源引起 ,或是自身故障造成 ,都有火势猛、蔓延快、抢救难、损失重大的特点 ,电缆着火原因多样化 ,又难以从根本上避免 1 Introduction In recent years, China’s power sector, power supply departments and industrial and mining enterprises with large power consumption, caused by the ignition of the fire caused by a fire have occurred from time to time, bring greater losses to the national economy. Cable fire accidents, whether caused by external sources of fire, or caused by their own failures, have fierce fire, spread fast, difficult to rescue, loss of major characteristics, the reasons for the diversification of the cable fire, it is difficult to fundamentally avoid