ECSE 361 Lecture Notes - Lecture 4: Volt-Ampere, Delta Connection, Ac Power
4 Dec 2017
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A delta connected load draw a current of 15a at lagging p. f. of . 85 from 400v, 3-phase, A balanced 3-phase star connected load of 100 kw takes leading current of 80a, when connected across 3-phase, 1100v, 50hz supply. R = 5. 2 , c = 532 f. In case of star connected load ip = il. Ip = il = 80a & vl = 1100v vp= Xc = z sin = 7. 94 . 754 =5. 986 . Each phase of star connected load consists of non-inductive resistance of 50 in parallel with a capacitance of 63. 6 f. Calculate the line current, total power absorbed, total kva and the power factor when this load is connected to a 381 v (line voltage), 3-phase, 50hz supply. Ip = vp yp = 220 (0. 02+j0. 02)=4. 4+j4. 4=6. 22 45 a. S = (220+j0) (4. 4 j4. 4)=968 j968 = 1369 45 va. Total apparent power in the 3 phase = 3 1369 va =
