Five causes of cable explosion

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Author Source:admin       Release time: 2018-03-15 18:33
Reading:First, the insulation damage caused a short circuit fault The protective layer of the power cable is damaged during laying or mechanical damage to the cable insulation during operation, causing breakage of the cable between the phases or th

First, the insulation damage caused a short circuit fault
The protective layer of the power cable is damaged during laying or mechanical damage to the cable insulation during operation, causing breakage of the cable between the phases or the protective layer, and the generated arc causes the insulating material and the cable outer protective layer material to burn and catch fire.
Second, the cable is overloaded for a long time
For a long period of overload operation, the operating temperature of the cable insulation material exceeds the maximum allowable temperature of normal heating, accelerating the insulation aging of the cable, and this insulation aging phenomenon usually occurs on the entire cable line. Due to the aging of the cable insulation, the insulating material loses or reduces the insulation performance and mechanical properties, so that it is easy to cause fire and fire, and even burning fire occurs along the entire length of the cable at the same time.
Third, the middle joint box insulation breakdown
The middle joint of the cable splice box is not tightly pressed, the welding is not firm or the joint material is not properly selected. During operation, the joint is oxidized, generates heat, and flows. When the cable middle joint is made, the quality of the insulating agent poured in the middle joint box does not meet the requirements. Requirements, when the insulating agent is poured, there are pores in the box and the cable box is poorly sealed, damaged and leaks moisture. All of the above factors can cause insulation breakdown, resulting in short circuit and explosion of the cable.
Fourth, the cable head burning
As the surface of the cable head is damped and accumulated, the porcelain casing of the cable head is broken and the distance between the lead wires is too small, causing the flashover to ignite and causing insulation on the surface of the cable head and insulation burning of the lead wire.
V. External fire and heat sources cause cable fires
Such as the spread of fire in the oil system, the spread of oil circuit breaker explosion fires, the spontaneous combustion of coal powder in coal-fired boiler systems or coal-fired systems, the baking of high-temperature steam pipes, the chemical corrosion of acids and alkalis, the welding sparks and other types of ignition Fire.

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