Question

Asked Feb 5, 2019

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The ABCD constants of a three-phase, 345-kV transmission line are:

A = D = 0.98182 + j0.0012447.

B = 4.035 + j58.947.

C = j0.00061137.

The line delivers 400 MVA at 0.8 lagging power factor at 345 kV. Determine the sending end quantities, voltage regulation, and transmission efficiency.

Hint: Efficiency is equal to the ratio of active power at the receiving end to the active power at the sending end.

Step 1

Since, the given ABCD parameters for the 345 kV transmission lines are:

A = D = 0.98182 + j0.0012447

B = 4.035 + j58.947

C = j0.00061137

Also, this transmission line is operated to deliver power 400 MVA at lagging power factor of 0.8 and voltage 345 kV.

Step 2

As the transmission line operates at voltage 345 kV thus, the receiving end voltage per phase for this transmission line is as:

Step 3

Also, the power delivered by the transmission line is 400 MVA at a lagging power facto...

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