Precautions, operational characteristics and operation conditions of power cable installation

1, power cable installation matters needing attention

When the cables are installed parallel to the heat pipes, the distance between 2m should be maintained, and 0.5m should be maintained when crossing.

When the cable is parallel or cross installed with other pipelines, 0.5m distance should be maintained.

The buried depth of 1-35KV cable is not less than 0.7m when the cable is buried directly.

When 10KV and below cables are installed in parallel, the distance between each other is not less than 0.1M, 10-35KV is not less than 0.25m, and the distance between cross installation is not less than 0.5m.

The laying temperature of the cable is not less than 0 degrees, the bending radius is more than 15 (D+d), the single core cable is more than 20 (D+d), (D is the outer diameter of the cable, D is the outer diameter of the conductor).

6KV and above cable connector:

(1) when installing the cable terminal, the semiconductor shielding layer must be stripped. The insulation should not be damaged during operation. The scratch should be avoided. If necessary, sandpaper will be used to smooth the shield. The shielding ends should be smoothed and Shi Moceng carbon particles should be removed.

2. The copper strip shield and steel armour of plastic insulated cable terminal must be grounded properly, and the principle of short circuit is also followed. It avoids the induced electromotive force at the end of the steel armor, and even the "fire" and the combustion jacket. The grounding lead wire requires me to use tin plated braided copper wire and ferrochrome tin soldering when connecting with the cable copper belt. It is not suitable to use the torch to seal the weld so as to avoid burning the insulation.

3. The three phase copper shield should be connected to the ground wire respectively. Attention should be given to shielding grounding wire and steel armored ground wire to separate each other and to insulate each other. The location of welding ground wire should be as low as possible.

The basic requirements for cable ends and intermediate joints are as follows: A. conductor connection; B. insulation is reliable; radiation crosslinking heat shrinkable silicone rubber insulation material is recommended; C. is well sealed; D. has enough mechanical strength to adapt to various operating conditions.

The ends of cables must be protected from erosion by water and other corrosive materials, so as to prevent breakdown due to the ageing of insulation caused by water trees.

Cable handling must be carried out with crane or fork lift truck. It is prohibited to be transported flat or flat. Large cable should be installed with cable car to avoid damage to cable or abrasion due to manual dragging.

If the cable cannot be laid in time for any reason, it should be stored in dry place to prevent the sun from drying up and the water intake at the end of the cable.

Attention: the installation of cable or cable should be familiar with the installation personnel or full-time technical personnel who are familiar with the performance of wire and cable. If there is still something unclear, please consult with the relevant technical department or the technical department of our factory.