How do cables explode and catch fire?

I. How is the cause of cable explosion and fire? Power cable insulation is composed of paper, oil, hemp, rubber, plastic, asphalt and other various combustible substances, therefore, the cable has the possibility of fire and explosion. Causes of cable fire and explosion are: (1) insulation damage caused by short-circuit failure. Power cable protection lead skin in the laying of the cable was damaged or in operation cable insulation by mechanical damage, caused by the cable phase or between the lead insulation breakdown, resulting in an arc so that the insulation material and the cable outside the protective layer of material combustion fire. (2) Cable overload operation for a long time. Prolonged overload operation, the cable insulation material running temperature exceeds the normal heating of the higher allowable temperature, so that the cable insulation aging dry, this insulation aging dry phenomenon, usually occurs in the entire cable line. As the cable insulation aging dry, so that the insulating material to lose or reduce the insulating properties and mechanical properties, and thus prone to breakdown fire burning, and even along the entire length of the cable at the same time multiple combustion fire. (3) oil-immersed cable due to the difference in height occurs flow, oil leakage. When the oil-immersed cable laying height difference is large, may occur when the cable flow oil phenomenon. The result of the flow, so that the upper part of the cable due to the loss of oil and dry, the thermal resistance of this part of the cable increases, so that the paper insulation is scorched and premature breakdown. In addition, due to the upper part of the oil downward flow, in the upper cable head to make space and generate negative pressure, so that the cable is easy to absorb moisture and make the end of the moisture. The lower part of the cable due to the accumulation of oil and generate a lot of static pressure, prompting the cable head oil leakage. Cable moisture and oil leakage have increased the chance of fire failure. (4) Intermediate joint box insulation breakdown. Cable joint box intermediate joints due to crimping is not tight, welding is not secure or improper choice of joint materials, running joint oxidation, heat, glue flow; in the middle of the cable joints, filling in the intermediate joint box insulating agent quality does not meet the requirements of the filling insulating agent, the box within the memory of the air holes and cable box sealing is poor, damaged and leaking into the moisture, the above factors can cause insulation breakdown, forming a short circuit, so that the cable explosion fire. The above factors can cause insulation breakdown, forming a short circuit, so that the cable explosion and fire. Electrical automation technology network (5) cable head burning. Due to the surface of the cable head moisture accumulation of pollution, cable head ceramic casing rupture and lead wire phase distance is too small, resulting in flashover fire, caused by the cable head surface insulation and lead wire insulation burning. (6) External fire and heat sources lead to cable fires. Such as the spread of fire in the oil system, the spread of the oil circuit breaker explosion fire, boiler pulverizing system or coal system coal dust spontaneous combustion, high-temperature steam pipeline baking, chemical corrosion of acids and alkalis, welding sparks and other fires, can make the cable fire.

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