What are the advantages and disadvantages of power cable lines?

I. What are the advantages and disadvantages of power cable lines? Power cable lines are power transmission and distribution lines that use cables to deliver electricity. Power cable lines are generally laid underground or underwater, there are also overhead laying of power cable lines. Power cable lines are mainly composed of cables, cable intermediate joints, cable terminals, etc. Some power cable lines also have accessories, such as pressure boxes, pressure and temperature warning devices. Underground power cable lines also include the corresponding civil facilities, such as cable trench, rows of pipes, shafts, tunnels and so on. Power cable lines have the following advantages: 1, the cable is laid underground, does not occupy the ground, space, the same underground cable channel, can accommodate multiple lines 2, in the city roads and large factories, power supply by cable, is conducive to the cityscape, the factory neat and beautiful; natural meteorological conditions (such as lightning, wind and rain, salt spray, dirt, etc.) and the surrounding environment on the cable is very small; 3, the cable is hidden in the ground, the person is relatively Reliable, high reliability of power supply; cable line operation and maintenance costs are relatively small. Power cable lines have the following shortcomings: 1, cable line construction investment costs are higher, is several times the overhead line; 2, cable faults hidden, testing is more difficult; 3, cable damage, recovery time is longer; 4, the cable is not easy to branch; 5, cable and accessory selection, cable sheath grounding, cable laying, distribution of dirty areas, civil facilities type and capacity.

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