A 3-phase, 220 kV, 50 Hz transmission line consists of 15 cm radius conductor spaced 2 meters

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Question:

A 3-phase, 220 kV, 50 Hz transmission line consists of 1·5 cm radius conductor spaced 2 meters apart in equilateral triangular formation. If the temperature is 40ºC and atmospheric pressure is 76 cm, calculate the corona loss per km of the line. Take mo = 0·85.