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Question

Do the same exercise as above with the replacement of the earliertransformer by a 40,000-220 V step-down transformer (Neglect, asbefore, leakage losses though this may not be a good assumptionany longer because of the very high voltage transmission involved).Hence, explain why high voltage transmission is preferred?

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Solution

Given: The total demand is

a)

The line current given by,

Where,

By substituting the given values in the above expression, we get

The line losses are given by,

Where,

By substituting the given values in the above expression, we get

Thus, the power loss in the line in the form of heat is

b)

*The power *supplied by the plant is given as,

* *

Where,

By substituting the given values in the above expression, we get

Thus, the plant must supply

c)

Voltage drop in the line is given as,

By substituting the given values in the above expression, we get

Percentage power loss in the line is given as,

By substituting the given values in the above expression, we get

Thus, it is observed that as the transmission voltage is increased from

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