A balanced Y-connected voltage source with E a g = 277 ∠ 0 ° volts is applied to a balanced-Y load in parallel with a balanced -Δ load where Z Y = 20 + j 10 and Z Δ = 30 − j 15 ohms . The Y load is solidly grounded. Using base values of S base1 ϕ , = 1 0 kVA and V baseLN = 277volts , calculate the source current I a in per-unit and in amperes
A balanced Y-connected voltage source with E a g = 277 ∠ 0 ° volts is applied to a balanced-Y load in parallel with a balanced -Δ load where Z Y = 20 + j 10 and Z Δ = 30 − j 15 ohms . The Y load is solidly grounded. Using base values of S base1 ϕ , = 1 0 kVA and V baseLN = 277volts , calculate the source current I a in per-unit and in amperes
Solution Summary: The author calculates the base value of the Y connected load impedance, which is BeginarraylI_ap.u.
A balanced Y-connected voltage source with
E
a
g
=
277
∠
0
°
volts
is applied to a balanced-Y load in parallel with a balanced
-Δ
load where
Z
Y
=
20
+
j
10
and
Z
Δ
=
30
−
j
15
ohms
. The Y load is solidly grounded. Using base values of
S
base1
ϕ
,
=
1
0
kVA
and V
baseLN
=
277volts
, calculate the source current
I
a
in per-unit and in amperes
Four conductors meet at a junction. the current are i1= 5sinwt, i2= 3sin(wt + 90) and i3= 2sin(wt-90). calculate the rms value of i4.
An 11 kV generating station has four identical 3-phase alternatorsGl, G2, G3 and G4 each of L0 MVA capacity and l2%o reaclarce.There are two section of bus-bar P and Q, linked by a reactor X ratedat 10 MVA with 24o/oreactance. From section Q load is taken througha 6 MVA, i 1kV/66kV step-up transformer (T1) having a reactance of37o. Determine the fault current if a three-phase short-circuit occursnear the high voltage terminal of the transformer (F) as shown inFigure.Assume prefault voltages to be 1 pu and prefault currents to be zero
15) Kirchhoff's Voltage Law (KVL) states that
A) the product of the phasor voltages around any closed path must equal zero.
B) the sum of the phasor voltages around any closed path does not have to equal zero.
C) the sum of the phasor voltages around any closed path must equal zero.
D) the sum of the phasor voltages around a closed path cannot include "through the air."
Chapter 3 Solutions
Power System Analysis and Design (MindTap Course List)
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