The A, B, C, D constants of a 220 kV line are: A = D =

The A, B, C, D constants of a 220 kV line are:
A = D = 0.94 ∠1°,
B = 130 ∠73°,
C = 0.001 ∠90°
If sending end voltage of the line for a given load delivered at nominal voltage is 240 kV, then % voltage regulation of the line is

Voltage at sending-end,
V_s = AV_R + BI_R
at no-load,
I_R = 0
and

V_RO =	V_s	=	240
	A		0.94∠1°

= 255.32 Volts

% voltage regulation =	V_RO - V_RL	× 100
	V_RL

Where V_RL is the full-load voltage at receiving-end

=	255032 - 220	× 100 = 16%
	220