1 引起电气设备发热起火的原因1.1 短路 电气设备和线路,由于绝缘老化、积污、受潮、化学腐蚀或机械损伤造成绝缘强度降低或破坏,导致相间短路.1.2 接触不良 导线连接松动,活动触点压力不够紧密,转动电气设备,由于长期振动,接触部位氧化,导致发热、打火、产生电弧.1.3 过载 由于电气设备和线路严重过载,引起电流增加,随时间的变化,产生电火花、电弧,引起火灾. 1 Causes of electrical equipment heating fire 1.1 short circuit electrical equipment and wiring, due to insulation aging, dirt, moisture, chemical corrosion or mechanical damage caused by reduced or damaged dielectric strength, resulting in short-circuit phase .1.2 bad connection loose connections, moving contacts The pressure is not tight enough, rotating electrical equipment, due to long-term vibration, oxidation of the contact parts, resulting in heat, sparking, arcing .1.3 overload due to serious overload of electrical equipment and wiring, causing the current increase with time, resulting in sparks, arcs, Cause a fire.