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7. For the system of Fig. 22.39, find the magnitude of the<br />

unknown voltages and currents.<br />

3-phase<br />

Y-connected<br />

4-wire generator<br />

Phase sequence: ABC<br />

A<br />

N<br />

B<br />

C<br />

I Aa<br />

E AB = 220 V ∠0°<br />

E BC = 220 V ∠ + 120°<br />

E CA = 220 V ∠ –120°<br />

*8. Compute the magnitude of the voltage E AB for the balanced<br />

three-phase system of Fig. 22.40.<br />

3-phase<br />

Y-connected generator<br />

A<br />

B<br />

C<br />

E AB<br />

I Bb<br />

I Cc<br />

c<br />

+<br />

I cn<br />

V cn<br />

FIG. 22.39<br />

Problems 7, 32, and 44.<br />

1 �<br />

1 �<br />

1 �<br />

Line resistance<br />

16 �<br />

FIG. 22.40<br />

Problem 8.<br />

10 �<br />

12 �<br />

10 �<br />

I an<br />

10 �<br />

–<br />

10 �<br />

a<br />

+<br />

a<br />

V an<br />

n –<br />

–<br />

n<br />

–<br />

10 �<br />

16 �<br />

12 �<br />

10 �<br />

12 �<br />

V bn<br />

PROBLEMS ⏐⏐⏐ 1007<br />

I bn<br />

V φ = 50 V<br />

c + b<br />

+<br />

16 �<br />

b

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