Page 86 - Electric Machinery Fundamentals

62 ELECTRIC MACHINERY FUNDAMENTALS

0.010 -------- ---------- ---------------

0.005

0~--~--~2~--~3~~-4~--~5L---~6~--~--~8~---t(ms)

-0.005

- 0.010 ----------- -- - ------- -------- -----

FIGURE Pl-12
Plot of flux 0/ as a function of time for Problem 1-16.

i
:::-....
N=?
Nturns
Depth = 5 em

1,.=5cm
19:::: 0.05 em

1('= 60 em

FIGURE PI- 13
The core of Problem 1- 17.

1- 19. Figure Pl-14 shows a simple single-phase ac power system with three loads. The
voltage source is V = 240LOO Y, and the impedances of these three loads are
2, ~ IOL30' D 22 ~ lOL45' D
Answer the following questions about this power system.
(a) Assume that the switch shown in the figure is initially open, and calculate the
current I , the power factor, and the real, reactive, and apparent power being
supplied by the source.
(b) How much real, reactive, and apparent power is being consumed by each load
with the switch open?