Three identical impedances Z Δ = 30 ∠ 30 ° Ω are connected in Δ to a balanced three-phase 208-V source by three identical line conductors with impedance Z L = ( 0.8 + j 0.6 ) Ω per line. (a) Calculate the line-to-line voltage at the load terminals. (b) Repeat part (a) when a s-connected capacitor bank with reactance ( − j 60 ) Ω per phase is connected in parallel with the load.
Three identical impedances Z Δ = 30 ∠ 30 ° Ω are connected in Δ to a balanced three-phase 208-V source by three identical line conductors with impedance Z L = ( 0.8 + j 0.6 ) Ω per line. (a) Calculate the line-to-line voltage at the load terminals. (b) Repeat part (a) when a s-connected capacitor bank with reactance ( − j 60 ) Ω per phase is connected in parallel with the load.
Solution Summary: The line-to-line voltage at the loads terminals is 203.1angle 0.649°V. In Delta -connected network, the phase current is equal to
Three identical impedances
Z
Δ
=
30
∠
30
°
Ω
are connected in
Δ
to a balanced three-phase 208-V source by three identical line conductors with impedance
Z
L
=
(
0.8
+
j
0.6
)
Ω
per line. (a) Calculate the line-to-line voltage at the load terminals. (b) Repeat part (a) when a s-connected capacitor bank with reactance
(
−
j
60
)
Ω
per phase is connected in parallel with the load.
Answer the following questions:
1- Write radiation resistance (R.) equation for infinitesimal dipole antenna.
2- Write the angle expression form of first null beam width (FNBW) for 2/2 dipole.
3- Define the Directivity of antenna.
4- Write radar cross section equation.
5- Write the input impedance (Z) expression of lossless transmission line.
The input reactance of an infinitesimal linear dipole of length 1/60 and radius
a = x/200 is given by
[In(/2a) - 11
X-120-
tan(kl/2)
Assuming the wire of the dipole is copper with a conductivity of 5.7 × 10'S/m.
determine at f = 1 GHz the
(a) loss resistance
(b) radiation resistance
(c) radiation efficiency
input impedance
Q4- a) For the block diagram of control system shown below with its unit step response. Determine
(K, a,damping ration, Maximum overshoot, Wn, Wd,ẞ, ts, tp, td, tr, and overall transfer function?
C(1) ↑
1.4
1.2
1
0.8
0.6
0.4
0.2
R(s)
E(s)
K
C(s)
$(s + α)
0.05
0.1
0.15
0.2
+2%
-2%
Chapter 2 Solutions
Power System Analysis and Design (MindTap Course List)
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