Often see the cable explosion fire news, but why the cable explosion, the following are a few cable explosion several important reasons for the fire:

The insulation layer of power cable is composed of paper, oil, hemp, rubber, plastic, asphalt and other combustible substances, therefore, the cable has the possibility of fire explosion. The cause of the cable fire explosion is:

(1) insulation damage caused by short-circuit fault. Power cable protection When the laying of the lead is damaged or damaged in the operation of cable insulation by mechanical damage caused by cable or lead between the insulation breakdown, the resulting arc of insulating material and cable outer protective layer material burning fire.

(2) long-term overload operation of the cable. Long-term overload operation, the cable insulation material operating temperature exceeds the maximum allowable temperature of normal heating, the aging of the cable insulation dry, this phenomenon of aging insulation dry, usually occurs throughout the cable line. Due to the aging of the cable insulation dry, so that loss of insulating material or reduce the insulation and mechanical properties, and thus prone to fire burning through the fire, even along the entire length of the cable at the same time a number of combustion fire.

(3) oil-immersed cable due to height difference occurs drip, oil spills. When the laying of oil-immersed cable height difference is large, cable drip phenomenon may occur. The flow of the results of the upper part of the cable due to the loss of oil and dry, this part of the cable's thermal resistance increases, the paper insulation coking and early breakdown. In addition, since the upper portion of the oil drips down, a space is created at the upper cable head and a negative pressure is generated, so that the cable tends to absorb moisture and wet the ends. The lower part of the cable due to the accumulation of oil and produce a lot of static pressure to promote the cable head oil. Cable damp and oil spills have increased the probability of failure fire.