Underground Electrical Cable Vs Overhead Lines

20 to 40 for new underground works.

Underground electrical cable vs overhead lines.

Overhead lines interfere with communication lines that are in close proximity have corona discharge radio and tv interference which does not happen with the underground lines. And 2 dissipating the heat produced during the operation of the electrical. Hvdc are three times higher compare to overhead lines e g. Following are the disadvantages of underground transmission.

Aesthetics underground s number one advantage. With overhead lines you have to watch that tall trucks farm implements augers and other tall pieces of equipment don t get tangled in them. Safety less chance for public contact. Significantly less cost especially initial cost.

To minimize a large charging current produced in high voltage cables the length of the cable should be minimized. It is difficult to find and repair the wire breaks in case of failure of system. Reliability shorter outage durations because of faster fault finding and faster. The design and construction of underground transmission lines differ from overhead lines because of two significant technical challenges that need to be overcome.

Overhead line is a source of electrical and magnetic field where underground cables have the magnetic fields screened so only electrical fields might be an issue in this case. Moreover laying or burying cost of underground lines are greater compare to overhead lines. Much less visual clutter. Longer life 30 to 50 years vs.

Cost overhead s number one advantage. The electric field of the cable lines is fully limited by the metallic screen. In overhead line inductor plays major roles and in underground cable the capacitor plays major role. 1 providing sufficient insulation so that cables can be within inches of grounded material.

Safety factors of underground vs. Undergrounding is the replacement of overhead cables providing electrical power or telecommunications with underground cables it demonstrates the higher technology in developed countries for fire prevention and to make the power lines less susceptible to outages during high wind thunderstorms or heavy snow or ice storms. Voltage drop there is more voltage drop in the overheads due to the fact that their cables are of much smaller diameter than underground cables for the same power delivery. Overhead lines are nothing but a conductor laid on the top of earth by installing transmission tower.

With underground feeders you have to watch out when you are digging.