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Causes Of Cable Head Overheating
- Oct 12, 2018 -

The main reason for overheat of cable head is the poor quality of the cable middle head.



(1) the pressure connection of the cable head is not tight, the contact resistance of the pressure connection is too high, and it overheats in operation.



(2) the geometrical location of the three-phase pressure joint of the cable head is asymmetric, resulting in asymmetric electric field and accelerating the aging of insulation.



(3) the residual air bubbles produced by the insulation filler and heat-shrinkable tube of cable head in the production process will be partially released under the action of electric field, which will eventually lead to the breakdown of insulation;



(4) during the cable head manufacturing process, the metal burr after the pressure connection of the pressure connection is not cleaned, leading to discharge at the tip during operation, which eventually leads to insulation penetration discharge.