Question

calculate the value of voltage regulation
at 0.8lagging for a transfomer' with
resistance drop 2% and reactance drop 4% of the voltage
​

Answer 1

Answer:

% Voltage Regulation = %R * cos Φ ± %X * sin(Φ)

Plus (+) sign is for lagging power factor and minus (-) sign is for leading power factor

Given

cos Φ = 0.8

so

sin Φ = 0.6

% Regulation = %R * cos Φ ± %X * sin(Φ)

% Regulation = (2*0.8)+(5*0.6)

% Regulation = 1.6 +3

% Regulation = 4.6%