Installation of high-voltage cable joints

1.When installing the cable terminal, the semi-conductive shielding layer must be stripped off, and the insulation must not be damaged during operation. Knife marks and unevenness should be avoided. If necessary, it should be smoothed with sandpaper; the shielding end should be flat and the graphite layer ( Carbon particles) are removed.

2. The copper shield and steel armor of the plastic insulated cable end must be well grounded. This principle should also be followed for short circuits to avoid induced electromotive force at the end of the steel armor during unbalanced three-phase operation, and even accidents such as ignition and burning of the sheath . The grounding lead wire should be tinned braided copper wire, and soldering iron should be used when connecting with the copper tape of the cable. It is not advisable to use a blowtorch to seal and solder, so as to avoid burning the insulation.

3. The three-phase copper shielding should be connected to the ground wire separately. Note that the shielding grounding wire and the steel armored grounding wire should be led out separately and insulated from each other. The position of the welding ground wire should be as low as possible.

4. The basic requirements for cable end and intermediate joints:
a. The conductor is well connected;
b. Reliable insulation, it is recommended to use radiation cross-linked heat-shrinkable silicone rubber insulation material;
c. Good sealing;
d. Sufficient mechanical strength, able to adapt to various operating conditions.

5. The cable end must be waterproof and corroded by other corrosive materials to prevent breakdown due to aging of the insulation layer caused by water trees.

6. Cable loading and unloading must use cranes or forklifts, horizontal transportation and laying flat are forbidden. When installing large cables, cable cars must be used to prevent cables from being damaged by external forces or scratching the insulation layer due to manual dragging.

7. If the cable cannot be laid in time for some reason, it should be stored in a dry place to prevent sun exposure and water ingress into the cable end.