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3. sınıf dersinin tüm ödevleri ve çözümleri.
vizeye çalışırken işe yarar
teşekkür iyidir
sol üstteki buton sadece bir tıklaman yeterli, yerine gider.

1. Describe the characteristics of the typical polyphase circuits that are used in electric power systems.
What are the advantages of 3-phase AC power systems over single-phase AC systems? Explain them
briefly.
2. Derive the total instantaneous power p(t) absorbed by the loads in the following single and three-phase
circuits. Compute and draw the instantaneous voltages, currents and powers using a computer software
or program.
(a) An impedance load Z = 1 + j0.5
is connected across a 100V rms, 50Hz voltage source.
(b) A balanced Y-connected load of Z = 10+j8
per phase connected to a balanced 50 Hz three-phase
source with a line-to-line voltage of 200 V rms.
3. [textbook, Prob. 2.7 on page 44] Two impedances, Z1 = 0.8 + j5.6
and Z2 = 8 − j16
, and a
single-phase motor are connected in parallel across a 200 V rms, 60 Hz supply as shown in the figure.
The motor draws 5 kVA at 0.8 power factor lagging.
+
_
200 0o
I1 I2 I3
I
M
0.8
j 5.6
8
- j
gibisinden..

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