Question

Asked Feb 5, 2019

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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.

Step 1

We need to determine the sending end voltage, voltage regulation, the sending end power, and transmission efficiency for a 69 kV, three phase short transmission line of 16 km length. The per phase series impedance is given below.

Step 2

The total line impedance is,

Step 3

In part a of question, transmission line delivers ...

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