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Electrical Applications 2 by David W. Tyler

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Solutions to
problems
SECTION 1 4 (i) 285.7 A, 16.33 kW; (ii) 28.57 A, 163 W.
18 19.05 kV.
19 216.5 V.
21 0.972 p.u.
22 AB, 23.8 A, BC 3.81 A, CD 26.2 A, Min. P.D. at C = 218.43 V.
23 50 A load power = 11.794 kW.
24 AB 89.6 A, BC 69.6 A, CD 39.6 A, DE 29.6 A, EF 20.4 A,
FG 40.4 A, GA 65.4 A. Min. P.D. at E = 235.9 V.
25 (a) 50 A load; 231.75 V; 11.587 kW.
125 A load; 230.12 V; 28.765 kW.
80 A load; 235.22 V; 18.817 kW.
(b) Efficiency = 59.169/61.293 = 0.965 p.u.
SECTION 3 2 2.68p/kWh