Question

6. An industhal lood consumes 88kw at apf of 0.707 logging from a 480-V in line. The transmission live reaistance from The power company's transformer to the plant is 0.08. Determine the ре thad must be supplied by the power company (a) under present conditions p : 93.38kW (b) of the pf is somehow charged to 0.90 logging. 여 economically advantageous to have as close to one as povable. P=91.32kw. p.f

Answer 1

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Girens VL Vs ol + TX-line Pia 88kw at 0.707 480 Volt G lagging R=0.082 Ps. Tx-line is connected blue power company and plant ( Ludlus trial plant) So here we do calculation for 3-0 transmission. Per 53 VL de Costa P=88x103 weite VL= 480 v R Cosphez 0 707 = Pf. 88x103 - 53x480x 0.707 x & &a 149. H L-cas? (0707) &= 149.712-45° Amp Total Resistance of TX line is given oo8 Vs= Vet RR Vs = 480 + 149.71 L-45°*008 Vs= 488.544-0.99 &=&= 149.71 2-45° Ps - √3 VL & Cosas ¢= (45-09933) 44:00 03 44° cospe 0.72 Ps: 53 x 49854X14971 X072 Ps= 91.21 kW Ans

if the load 53x480X & X 0.9 = 88x103 P-t is changed to og lagging than Pips S3 VL2 Los AE 8881032 &L= 11760 & 2-wy(09) le 11+614-25.85 VS= VL + PER Vs= 480+ 117.61_-25.85 X008 Vs= 488.484-01481 no = (2585-0:48D 25-34° 트라우 Ps= 53 Vs Is cosas &s=du 117.61 Cotos COC 28-37) :9036 Ns=488.48 Ps= 53x48848411761 40.9036 Ps= 89.910 kW Ans