The cable is the bridge between the power supply equipment the power equipment, plays the role of transmitting electrical energy. Due to the widespread use of high-voltage cable connectors, various problems often occur. The following is a brief analysis of the causes of common problems in high-voltage cable connectors:

    There are four major categories: manufacturer manufacturing reasons, construction quality reasons, planning unit planning reasons, external force destruction.

    1. Manufacturer's manufacturing reasons

Among the reasons for the manufacturer's manufacturing, according to the location of the high-voltage cable joint problem, it is divided into the cause of the cable body, the cause of the cable joint, the cause of the cable grounding system.

1. Reasons for manufacturing cable body

Generally, the problems that occur briefly in the cable production process are insulation pain, uneven thickness of the insulation shield, impurities in the insulation, protrusions on the inside outside of the shield, uneven crosslinking, moisture in the cable, poor sealing of the cable metal sheath, etc. The situation is more severe. There may be problems in the completion test shortly after the commissioning. Most of them exist in the cable system by the defect method, which poses a serious risk for the long-term safe operation of the cable.

2. Reasons for cable joint manufacturing

High-voltage cable joints used to be wrapped, molded, molded, etc., requiring a large amount of on-site manufacturing operations, because of the constraints of on-site conditions manufacturing processes, there is inevitably an air gap between the insulating tape layers impurities, so the problem is abbreviated. The types widely used in China are assembled prefabricated.

High-voltage metal cable joints are divided into cable terminal joints cable center joints. No matter what the joint method, cable joint faults generally appear at the cable insulation shielding break, because this is electrical stress gathers, the cable joint faults are caused by manufacturing reasons. The causes include defects in the manufacturing of the stress cone body, insulation filler problems, oil leakage the seal ring.

3. Cable grounding system

The cable grounding system includes a cable grounding box, a cable grounding protection box (with protective layer protector), a cable interpenetrating box, a protective layer of protective layer other parts. Generally, the problem that occurs briefly is mainly because the tank is well sealed, the water inlet leads to multiple points of grounding, which causes the metal sheath to induce excessive current. Unreasonable parameter selection of other protective layer protectors unstable quality of zinc oxide crystals also cause damage to the protective layer protector.