6 causes of power cable fire and explosion?

1. Insulation damage caused by short-circuit failure. Power cable protective lead skin in the laying of the cable is 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 in many places burning fire. 3. oil-immersed power cables due to the difference between the high flow, oil leakage. When the oil-immersed cable laying height difference is large, may occur when the cable oil flow 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 early 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. middle 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 joints oxidation, heat, glue flow; in the middle of the cable joints, filling in the middle of the 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 leakage into the moisture, the above factors can cause insulation breakdown, the formation of a short-circuit, so that the cable explosion and fire. 5. Cable head burning. Due to the surface of the cable head moisture accumulation of dirt, 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 combustion.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 pipe baking, chemical corrosion of acids and alkalis, welding sparks and other fires, can make the power cable fire.

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