313_excred_2 - Extra
Credit
II
 
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Unformatted text preview: Extra
Credit
II
 
 EE
313
–
Fall
2009
 
 A
three
phase,
balanced,
Y‐connected
source
with
a
line
voltage
of
220
Vrms
is
 connected
to
the
following
three‐phase,
balanced
loads.

(Assume
 
 Z1:

Absorbs
15kW
at
0.3
lagging
and
is
Δ‐connected
 Z2:

Absorbs
30∠25°
kVA
and
is
Y‐connected
 Z3:

is
Y‐connected
and
has
a
current
magnitude
of
40
Arms
at
0.64
lagging
 Z4:

has
an
impedance
of
1.5∠75°Ω
and
is
Δ‐connected
 Z5:

Absorbs
21kW
and
48kVARS
and
is
Y‐connected
 Z6:

Absorbs
15kVAR
and
is
purely
inductive
and
Δ‐connected
 
 a. Find
Van,
Vab,
IaA,
and
IAB.
 b. Find
the
impedance
of
each
load
in
both
the
Δ and
Y
configurations.
 c. Find
the
total
three‐phase
power
delivered
by
the
source.
 d. Design
a
Y‐connected
load
to
correct
the
power
factor
of
the
combined
loads
 to
0.95
lagging.
 ...
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