Transmission and Distribution of electric power by underground system is superior to overhead system in respect of Appearance and public safety, Maintenance cost and Frequency of faults, power failure and accidents.
9.The main drawback of underground system over overhead system is
AExposure to lightning
BHeavy initial cost
CExposure to atmospheric hazards such as smoke, ice, wind etc.
DInductive interference between power and communication circuits.
The highest transmission voltage used in India is 765 kV.
20.If variable part of annual cost on account of interest and depreciation on the capital out lay is equal to the annual cost of electrical energy wasted in the conductors, the total annual cost will be minimum and the corresponding size of conductor will be the most economical. This statement is known as
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