GATE EE 2016 Set 2 — Question 50
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Power Systems → Transmission Line Performance → Ferranti Effect
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Question
At no load condition, a 3-phase, 50 Hz, lossless power transmission line has sending-end and receiving-end voltages of 400 kV and 420 kV respectively. Assuming the velocity of traveling wave to be the velocity of light, the length of the line, in km, is ____________.
Correct answer
294 to 298
Solution
For a lossless line at no load () the ABCD relation givesso the receiving-end voltage exceeds the sending-end voltage (Ferranti effect).Step 1 - phase constant. With km/s and Hz:Step 2 - length.Answer: km
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