Question

A 69-kV, three phase short transmission line is 16km long. The line has a per phase series impedance of 0.125 + j0.4375 ohms per km. Determine the sending end voltage, voltage regulation, the sending end power, and the transmission efficiency when the line delivers:
(a) 70 MVA, 0.8 lagging power factor at 64 kV.
(b) 120 MW, unity power factor at 64kV.

A 69-kV, three-phase short transmission line is 16 km long. The line has a per
phase series impedance of 0.125 +50.4375 Ω per km. Determine the sending end
voltage, voltage regulation, the sending end power, and the transmission efficiency
when the line delivers
(a) 70 MVA, 0.8 lagging power factor at 64 kV.
(b) 120 MW, unity power factor at 64 kV.

Image Transcription

A 69-kV, three-phase short transmission line is 16 km long. The line has a per phase series impedance of 0.125 +50.4375 Ω per km. Determine the sending end voltage, voltage regulation, the sending end power, and the transmission efficiency when the line delivers (a) 70 MVA, 0.8 lagging power factor at 64 kV. (b) 120 MW, unity power factor at 64 kV.

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