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Exam_1_Solution - Problem I For the circuit in Figure 1...

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Unformatted text preview: Problem I For the circuit in Figure 1, draw single phase equivalent circuit, calculate the magnitude and the angle of line—to—line and phase voltage at the load as well as the real and reactive power at the load. 0.6 + j0.8 Q 500 v“ Z = 201400 a Z 2: 20140” 9 _____J Figur 1 6 e ‘—_. 04,200.?) __| L510 U 5.5% 62% \ \/ t 2&0ng x w»: I LOAD gem/é- 7‘ 209.49 6- A? A” Y 2:20 : (05 ya 5) 2L (51/0? 71/ 9-285) (5 l5 -/. a =1 926/. :22 A” / (9 525.5 Mama-28‘ - yga / f...— ______.-——-—~ 64am) e 72394 +d'éaW/e m \t’l K/‘W W B. 49.4, ligpflfllléw 2 QL$¢=lg-Z Kl/A’r Problem 2 a) A circuit consists of two impedances 2121045012, 22:154—40°£2 in parallel supplied by the source voltage of V=100430°V D termine and draw phasor diagram for the power of each impedance and tgeo lairce. Also find the power factor at the source. b) Assume that the real power of the source is to remain unchanged. If the power factor is to be corrected to pf=l, what element should be connected to the circuit and what would be the value, real and reactive power of that element? _ \Vlz .. IDOZ _. A) 5" at ‘ “ WK: W (A, —2_ P\ 62! WP \00 t/ 52: 2:“ ’ tam ‘ 3i "J‘tfiiié A P2 (1%.. 6-: s: s, +§Z $11555 alpaca U4 'W W PT Q" 0) £7; (32} 2 60 Pl "P2. C2) “”0” (3) 2 *Q2 2 gt 57, 777’ 2 37¢ [1’535 mp: 31' 1 120191 =O.0{b Lag CI) L3) B) \0 (913 ‘5 Lajjmg wok/Nah means we. \naure mac/3mm. Loadl \O \m?r0l{€. "Hfle ‘3? Jyo we; “(Lac/Q [\o achzQ a cox/Fmor‘vor . \ ”Una arcadure 9oWL€F Cerf *3'51.S UH—r £160??? (PC?- O W (11”? 62o“ V K 0063 59:, 3971-5 6 t z I L. "“' q Problem 3 Circuit in Figure 2 is supplied by the 100V, 60Hz source. Find the Northon equivalent circuit. 109 26 mH =30 Figure 2 \OJL 2N =- \o;1_1\ Omar-330) = CM [0 yo W—JBO 5 1 ...
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