The operation of the power cable line is one of the important parts of the power production. The safety of the cable line operation is related to the safety production of the enterprise and the safety of the people's lives and property. Today I will simply introduce the relevant issues in the operation and maintenance of the power cable.

1. The characteristics of cable lines

The cable line refers to a line that uses cable transmission power. It is mainly composed of cable body, cable intermediate connector, and wire end head. It also includes corresponding civil construction facilities, such as cable signs, tube, vertical wells, tunnels, etc. It is generally located underground, and there are overhead or underwater laying. Compared with the overhead line, the cable line has the following main advantages:

1. No interference with natural meteorological conditions (such as lightning, wind and rain, smoke, filth, etc.)

2. It is not affected by the growth of trees along the line;

3. It is conducive to the beautification of the urban environment;

4. Do not occupy the ground corridor, the same underground passage can accommodate more circuit lines;

5. It is conducive to preventing electric shock and safe electricity;

6. The maintenance cost is small. But there are also the following shortcomings;

7. The cross -sectional area of the same wire, the conveying current is smaller than the empty wire:

8. Investment construction costs increase, and increase with increased voltage;

9. Failure repair time is also long.

At present, the medium -voltage electric line should use a wire line in the following circumstances:

1. According to the planning of the city, those with special requirements for prosperous areas, important areas, main roads, high -rise buildings and high -rise buildings and high -rise buildings;

2. It is difficult to solve the overhead line corridor;

3. Users with high power reliability or important load users;

4. Key landscape tourist area;

5. Important power supply areas of major cities that are vulnerable to tropical storms in coastal areas;

6. The needs of the power grid structure or running safety

7. City center with high load density.