- The cost of the conductors used in over head lines in much lesser when compared to the under ground lines.
- The under ground lines need perfect insulation so it is provided with extra insulation which increases the cost.
- It is very difficult to identify and repair the faulty part in the under ground transmission lines.
- Skin effect and Proximity effect are more in under ground lines than the Over head transmission lines.
Monday, January 24, 2011
ELECTRICAL INTERVIEW QUESTIONS
These are the most frequently asked Electrical Interview Questions from Transmission & Distribution.
During my interview, i said my area of interest is Transmission & Distribution.Then i was bombarded with the following questions.
Why do we go for higher voltage transmission lines?
There are many advantages in transmitting the power at high voltages.Because for the same power,the copper loss(I^2R loss) will be less for higher voltages,since power= V*I.There for current value decreases thereby decreasing the power loss.
Why do we prefer overhead transmission line over under ground transmission line?