Question

Asked Feb 5, 2019

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Draw an impedance diagram for the electric power system shown in the figure attached, showing all impedances in per unit on a 100-MVA base. Choose 20kV as the voltage base for generator. The three-phase power and line-line ratings are given in the figure attached.

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Step 1

We can obtain the impedance diagram by using below steps: -

The base voltage *V _{BG1}* on the LV side of

This fixes the base on the HV side of T_{2} at V_{B2} = 200 kV, and on its LV side at*V _{BG2 }*= 200(20/200) = 20 kV

Step 2

The generator and transformer reactances in per unit on a 100 MVA base, as below: -

Step 3

The base impedance for the transmission line is

*ZBL* = (200)2/100 = 400 ohms

The per unit line reactance is

*Line: * *X = *(120/400) = 0.30 per unit

The load impedance in ohms is:

ZL = (V*L-L*)2/(S*L(3-phase) = (200)2/(48-j6...

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