Underground Electrical Cable Vs Overhead Lines

In overhead line inductor plays major roles and in underground cable the capacitor plays major role.

Underground electrical cable vs overhead lines.

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. The design and construction of underground transmission lines differ from overhead lines because of two significant technical challenges that need to be overcome. 20 to 40 for new underground works. And 2 dissipating the heat produced during the operation of the electrical.

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. Reliability shorter outage durations because of faster fault finding and faster. 1 providing sufficient insulation so that cables can be within inches of grounded material. 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.

It is difficult to find and repair the wire breaks in case of failure of system. Safety less chance for public contact. Overhead lines are nothing but a conductor laid on the top of earth by installing transmission tower. 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.

Digging around underground feeders is a disaster waiting to happen. According to the may 2011 paper underground electric transmission lines published by the public service commission of wisconsin the estimated cost for constructing underground transmission lines ranges from 4 to 14 times more expensive than overhead lines of the same voltage and same distance. Cost of underground cables e g. The electric field of the cable lines is fully limited by the metallic screen.

Cost overhead s number one advantage. To minimize a large charging current produced in high voltage cables the length of the cable should be minimized. Following are the disadvantages of underground transmission. Safety factors of underground vs.

Moreover laying or burying cost of underground lines are greater compare to overhead lines. Much less visual clutter. Significantly less cost especially initial cost. Hvdc are three times higher compare to overhead lines e g.

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.