Nowadays, with the economic deveploment, in order to imporve the electrical to be used widely in the peoples’s life. So that now there is question need to solved , which is the best electrical line Overhead cable ot Underground Power Cable line? Now let us make a analyse as below:
1）Economic: overhead cable line from the economic point of view, overhead than cheaper in the ground, from the safety considerations buried relatively safe. Some cables are buried and some overhead in the air. Distribution line refers to the power plant from the three high-voltage hot line after several buck with the terminal transformer, and from the terminal transformer out of zero and fire line assigned to the user's home, the voltage has become 220v.
Overhead lines mainly refers to the overhead line, erected on the ground above, the insulator is the transmission line will be fixed on the tower on the ground to transmit power transmission lines. Easy installation and maintenance, low cost, but vulnerable to weather and the environment (such as wind, lightning, pollution, snow, etc.) caused by the failure, while occupying the entire power transmission corridor more land area, easy to cause electromagnetic interference to the surrounding environment .
The main components of overhead lines are: wire and lightning lines (overhead ground wire), towers, insulators, fittings, tower foundation, cable and grounding equipment.
3）Underground Power Cable :
Underground power cable have the relatively low failure rate of operation, operation and maintenance costs lower, higher reliability than overhead lines to adapt to a variety of adverse weather conditions. That will have a more better life.