Question

a 3 phase 50hz transmission line has impedance, per phase of 10 ohm and delivers a load of 35 MW at 132 kv and upf. What is the Voltage regulation in % of short transmission line?​

Answer 1

Answer

the percentage voltage regulation of regulations of transmission lines percentage is =21.21%

Answer 2

128.2 ∠ 93.1º

Explanation:

$I_{r$ = 50 x $10^{6}$/$\sqrt{3}$ x 132 x $x^{3$ x 0.8 = 273 A

$I_{3$ = 273 (0.8 - j 0.6)

= 218 - j 164 =273 < -36.9º

$V_{R}$ = 132,000/$\sqrt{3}$

= 76,230 ;

$V_{R}$ = 76, 230 + j0

$I_{S}$ = $CV_{R}$ + $DI_{R$

= 76,230 X 0.0015 <90º + 0.95 < 1.4º .273 < -36.0º

= j114 + 259.3< -35.5º

= 211 - j36

$V_{RO}$ = $V_{S}$/A

= 92,150/0.95 = 97,000 ; %regn

= $\frac{97,000 - 76,230}{76,230}$ = 27.1

$I_{C}$ = (211 - j36) = -77 + j128 = 128.2 < 93.1º