Question { 2464 }

why insulation cost is more in underground cable than in
overhead line?

Answer

An underground line is fill in the earth and when if the leakage current will flo in the erth the current rating will very high in the cable that is very dangerous for human and other and in the the overhead line the air is not good conductor of electricity while an underground line is more insulation than overhead line for this reason the insulation cost is more in underground system

Question { Siemens, 3017 }

If we increases the %impedance of Transformer then price of
Transformer will increases or decreases.

Answer

i think price of xmer will be decrease because impedance is an one of the type of loss of electrical energy