Question

Question 418 Marks: For the polyphase 8ystem shown in Fig Q4 1, the generator works at б0 Hz and ACB sequence, calculate the circuit parameters and fill the table below. (Approximate your numbers to 2 signiflcant digits) (Do not fill the shaded cells) Only final answers are needed) 30 S2 EA 1020 53 05 106.1 mH Eca EAB 30Ω 75 Ω 15.079 06 103 μF 11020c 5.258 μF Esc Fig Q4.1 Phase Phase A Phase B Phase C Total Load Phase Angle Phase Voltage Line Voltage Phase Current Av Power Power (VAR) Power Power Factor

Answer 1

v_an = 110 0 degree v_bn = 110 + 120 degree v_cn = 110 120 degree } phase voltage for the phase sequence, ACB . impedances: f = 60 HZ (1) in A phase z rightarrow X = jwLK x = j 39 . 9 ohm Z_A = (30 + j 39 . 94) Vertical-bar Vertical-bar (- j 50 . 02) Z_A = 78 . 96 - 18 . 4 degree = 741 . 92 - j 24 . 92 (2) in phase B: - Z_B = 75 - j/wc . Z_B = 75 - j 25 . 01 = R_B - j x_B . Z_B = 79 . 06 - 18 . 44 degree (3) in phase c: - x