Electric Power Distribution Engineering, 3rd Edition

Answers to Selected Problems

Chapter 2

1. 2.1 (a) 1112.5 kW; (b) 10.08 kW; (c) 88,300.8 kWh
2. 2.2 0.62
3. 2.3 (a) 1.0; (b) 0.50; (c) 0.60; (d) 0.44
4. 2.5 0.64
5. 2.6 (a) 1.0; (b) 0.55; (c) 0.65; (d) 0.48
6. 2.7 0.46
7. 2.8 0.75 and 0.33
8. 2.9 (a) 131,400 kWh; (b) $3285 2.11 (a) 0.40; (b) 0.50
9. 2.13 (a) $370.40; (b) 0.11; (c) 0.34; (d) justifiable
10. 2.15 (a) 0.41 and 0.29; (b) 30 and 60 kVA; (c) $196 and $262; (d) 4.937 kvar; (e) not justifiable

Chapter 3

1. 3.1 (a) 7.62∠60° kV; (b) 13.2∠30° kV
2. 3.2 (a) 27,745.67 VA; (b) 13,872.83 VA; (c) 41,618.5 VA; (d) 24 kVA; (e) 24 kVA; (f) 48 kVA; (g) 1.078
3. 3.4
   • (a) 100∠–30° A, 100∠30° A, and 100∠90° A
   • (b) ${\overline{I}}_A$ = 11.54∠0° A, ${\overline{I}}_B$ = 11.53∠–120° A, and ${\overline{I}}_C$ = 11.53∠ 120° A
4. 3.5 0 var and 83,040 W