The sending end and receiving end voltages of the short transmission line are 150 kV and 120 kV respectively. Calculate its percentage voltage regulation.

• A. 25%
• B. 40%
• C. 30%
• D. 20%

Answer: (A)

Where,
Vs - sending end voltage in kV
Vr - Receiving end voltage in kV.

Voltage regulation = (Vs - Vr)/Vr
= (150 - 120)/120
= 0.25
% R = 25 %