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AboutHenan Yuelong Jinke Cable Co., Ltd. (formerly Yanshi City Shuangke Wire Rod Factory) was founded in 2001. It is a manufacturer and service provider engaged in the production and sales of wires, cables and accessories, ......
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Professional manufacturer and service provider specializing in the production and sales of wires and cables and accessories
Heating causes of power cables and problems to be noticed in cable selection (I)
Release time：
2023-02-13
source：
network
When the power cable passes through a certain load current, it is always higher or higher than the allowable high continuous working temperature of the cable (the allowable high temperature of cross-linked polyethylene insulated cable is 90 ℃), and the cable heats up for a long time. If the cause is not found and the fault is eliminated in time, the insulation thermal breakdown phenomenon will occur after the cable continues to power on and run, resulting in the interphase short circuit tripping of the cable, which may cause fire in serious cases. Cable heating during operation may be caused by the following reasons:
When the power cable passes through a certain load current, it is always higher or higher than the allowable high continuous working temperature of the cable (the allowable high temperature of cross-linked polyethylene insulated cable is 90 ℃), and the cable heats up for a long time. If the cause is not found and the fault is eliminated in time, the insulation thermal breakdown phenomenon will occur after the cable continues to power on and run, resulting in the interphase short circuit tripping of the cable, which may cause fire in serious cases. Cable heating during operation may be caused by the following reasons:
1. The DC resistance of the cable conductor does not meet the requirements, causing the cable to generate heat during operation.
2. Improper selection of cable type will cause the conductor section of the used cable to be too small, and overload phenomenon will occur during operation. After a long time of use, the heating and heat dissipation imbalance of the cable will cause the heating phenomenon.
3. The arrangement of cables during installation is too dense, the ventilation and heat dissipation effect is not good, or the cables are too close to other heat sources, which affects the normal heat dissipation of cables, and may also cause the heating phenomenon of cables during operation.
4. Poor joint manufacturing technology and tight crimping will lead to excessive contact resistance at the joint and also lead to cable heating.
5. Poor inter-phase insulation performance of cables leads to low insulation resistance and heating during operation
6. The partial sheath of the armored cable is damaged, which will cause slow damage to the insulation performance after water ingress, resulting in the gradual reduction of the insulation resistance, and will also cause the heating phenomenon during the operation of the cable.
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2023-02-13
Henan Yuelong Jinke Cable Co., Ltd.
Add : Ying Jun Lu, Ying Fangkou Industrial Park, Gu County Town, Yanshi City, Luoyang City, Henan Province
Tel : +86 13663794466
E-mail : yljkdl@126.com
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