Power cable is one of the outstanding representative cables

Fire and explosion-proof

Power cable plants, substations and industrial and mining enterprises use a large number of power cables. Once the cables catch fire and explode, it will cause serious fires and power outages. In addition, a large amount of smoke and poisonous gas will be generated when the cables burn, which not only pollutes the environment, but also endangers human life. For this reason, attention should be paid to the fire protection of power cables.

Cause of fire

The reason for the explosion of the cable

The insulation layer of the power cable is composed of various combustible substances such as paper, oil, hemp, rubber, plastic, asphalt, etc. Therefore, the cable has the possibility of fire and explosion. The reasons for the fire and explosion of the cable are:

(1) Insulation damage causes short-circuit fault. The protective lead skin of the power cable is damaged during laying or the cable insulation is mechanically damaged during operation, causing the insulation breakdown between the cables or between the lead skins.

(2) The cable is overloaded for a long time. During long-term overload operation, the operating temperature of the cable insulation material exceeds the maximum allowable temperature for normal heating, which makes the cable insulation aging and dry.

This phenomenon of aging and dry insulation usually occurs on the entire cable line. Due to the aging and drying of the cable insulation, the insulating material loses or reduces the insulating properties and mechanical properties, so it is prone to strike through fire and even burn at multiple places along the entire length of the cable at the same time.