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# A Three-Phase Overhead Transmission Line

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A three-phase overhead transmission line line has a per-phase resistance of 0.15 ohm/km and a per-phase inductance of 1.3263 mH/km. Assume that the shunt capacitance is negligible. The length f the line is 40 kilometers and it operates under 220 kV and 60-Hz. The line is supplying a three-phase load of 381 MVA at 0.8 power factor leading and at 220kV. Using the short line method calculate the sending-end three-phase complex power and the transmission line efficiency.

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40 km, 220 kV ...

#### Solution Summary

This solution uses the transmission line per phase and the sending end of the line to calculate the transmission line efficiency. And annotated diagram of the short transmission line model and circuit equations are included.

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