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A small town with a demand of 800 kW of ...

A small town with a demand of 800 kW of power at 220 V is situated 15 km away from an electric plant generating power at 440 V. The resistance of the two wire line carrying power is `0.5Omega`.`km^-1`. The line gets power from the line through a 4000-220 V step-down transformer at a substation in the town.
Characterise the step-up transformer at the plant.

Text Solution

Verified by Experts

Voltage drop in the line
`I_(rms).R=200times15=3000V`
`therefore` The plant transformer should supply (4000+3000)=7000V
`therefore` `A440V//7000V` step-up transformer should be used.
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