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Do you know why these cables cause fire and explosion?

07-07-2017Edit: Guangdong Dengfeng
The insulation layer of power cable is composed of paper, oil, flax, rubber, plastic, asphalt and other combustible materials. Therefore, the cable has the possibility of fire and explosion. So what is the cause of the cable fire and explosion? I believe this is also the majority of consumers are most concerned about it.
Don't worry, then the small series to introduce to you ~ hope to help everyone's life!
(1) short circuit fault due to insulation damage. Lead protection power cable laying in damaged insulation or mechanical damage caused by cable cable in operation, and the lead or insulation breakdown, arcing the insulation and cable outer protective layer material fire.
(2) long time overload operation of cable. Overload operation for a long time, the maximum allowable temperature of cable insulation materials more than the normal operating temperature of heating, the dry cable insulation aging, the aging phenomenon of dry insulation, usually occurs in the cable line. As the cable insulation aging, dry, insulation materials to lose or reduce insulation and mechanical properties, and therefore prone to breakdown, fire, combustion, and even along the entire length of the cable fire at the same time many places.
(3) the oil immersed cable is leaking and leaking due to the height difference. When the oil immersed cable is installed with a higher elevation difference, cable lubrication may occur. As a result of the flow, the upper part of the cable is dried up by the loss of oil. The thermal resistance of this part of the cable increases and the insulation of the cable is broken in advance. In addition, as the upper oil drips down, space is released at the upper cable head and negative pressure is generated to allow the cable to absorb moisture and to damp the end. The lower part of the cable causes great static pressure due to the accumulation of oil, which causes the cable head to leak. Cable wetting and oil leakage all increase the chance of fire.
(4) insulation breakdown of intermediate junction box. The cable connector box joints by crimping tight, welding joint is not strong or improper material selection, joint oxidation, fever, gummosis in operation; in cable joints, insulation agent perfusion quality does not meet the requirements in the middle of the connector box, filling insulating agent, memory box has pores and cable box seal bad, damaged and leaking into the moisture, the above factors can cause insulation breakdown, a short circuit of the cable fire explosion.
(5) cable head burning. Because of the contamination of the cable head surface, the breakage of the cable head porcelain bushing and the small distance between the leading and outgoing lines lead to flashover and lead to the insulation of the cable head surface insulation and the insulation of the lead out line.
(6) fire and heat source lead to cable fire. If the oil system of fire spread, fire and explosion of oil circuit breaker spread, boiler pulverizing system or system of coal spontaneous combustion of pulverized coal, high temperature steam baking, chemical corrosion of acid, welding spark and other fire, can make the cable fire.
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