PM864AK01
PM864AK01
电气火灾的特点
过去普遍认为,电气间短路引起的火灾大多由带电导体间的短路所造成,由于短路电流大,可用带短路保护的断路器和熔断器来防止。实际情况并非如此,因大多数的短路火灾是由接地短路故障产生的电弧或电火花所引起。前者短路电流以千安计,金属线芯产生高温以至炽热,绝缘被剧烈氧化而自燃,火灾危险甚大,但金属性短路产生的大短路电流,能使断路器瞬时动作切断电源,火灾往往得以避免。后者因短路电流受阻抗影响,电弧长时间延续,而电弧引起的局部温度可高达3000~4000℃,很容易烤燃附近可燃物质引起火灾,又由于接地故障引起的短路电流较小,不足以使一般断路器动作跳闸切断电源,所以电弧性短路引起火灾危险远大于金属性短路。
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