Figure 3.32 shows the oneline diagram of a three-phase power system. By selecting a common base of 100 MVA and 22 kV on the generator side, draw an impedance diagram showing all impedances including the load impedance in per-unit. The data are given a follows: G : 90MVA 22kV x = 0 .18 per unit T 1 : 50MVA 22/220kV x = 0 .10 per unit T 2 : 40MVA 220/11kV x = 0 .06 per unit T 3 : 40MVA 22/110kV x = 0 .064 per unit T 4 : 40MVA 110/11kV x = 0 .08 per unit M : 66 .5MVA 10 .45kV x = 0 .185 per unit Lines I and 2 have series reactance’s of 48.4 and 65.43 Ω , respectively. At bus 4, the three-phase load absorbs 57 MVA at 10.45 kV and 0.6 power factor lagging.
Figure 3.32 shows the oneline diagram of a three-phase power system. By selecting a common base of 100 MVA and 22 kV on the generator side, draw an impedance diagram showing all impedances including the load impedance in per-unit. The data are given a follows: G : 90MVA 22kV x = 0 .18 per unit T 1 : 50MVA 22/220kV x = 0 .10 per unit T 2 : 40MVA 220/11kV x = 0 .06 per unit T 3 : 40MVA 22/110kV x = 0 .064 per unit T 4 : 40MVA 110/11kV x = 0 .08 per unit M : 66 .5MVA 10 .45kV x = 0 .185 per unit Lines I and 2 have series reactance’s of 48.4 and 65.43 Ω , respectively. At bus 4, the three-phase load absorbs 57 MVA at 10.45 kV and 0.6 power factor lagging.
Figure 3.32 shows the oneline diagram of a three-phase power system. By selecting a common base of 100 MVA and 22 kV on the generator side, draw an impedance diagram showing all impedances including the load impedance in per-unit. The data are given a follows:
G
:
90MVA
22kV
x
=
0
.18
per
unit
T
1
:
50MVA
22/220kV
x
=
0
.10
per
unit
T
2
:
40MVA
220/11kV
x
=
0
.06
per
unit
T
3
:
40MVA
22/110kV
x
=
0
.064
per
unit
T
4
:
40MVA
110/11kV
x
=
0
.08
per
unit
M
:
66
.5MVA
10
.45kV
x
=
0
.185
per
unit
Lines I and 2 have series reactance’s of 48.4 and
65.43
Ω
, respectively. At bus 4, the three-phase load absorbs 57 MVA at 10.45 kV and 0.6 power factor lagging.
Choose the correct answer to the following questions:
1- What is the total power radiated in Watts for the power density W =
a) 4π²
b) 8m²/3
2- Fresnel zone is also called as
sine
W/m²?
3r²
c) 4π²/3
d) 2π²/3
a) Near Field b) Far Field
c) Electrostatic Field
d) Reactive Field
3- The far-field distance at 900 MHz, if the maximum antenna dimension is 0.75 m is....
a) 3.375 m
b) 3.5m
c) 3.375 cm
d) none
4- The antenna gain is
on input power to antenna and
on power due to ohmic losses.
c) Independent, dependent d)
a) Independent, independent b) Dependent, independent
Dependent, dependent
5- If beam width of the antenna increases, then directivity.
a) Decreases b) Increases c) Remains unchanged d) Depends on type of antenna
please solve this and clarify each step. thanks
The input reactance of 1/2 dipole with radius of 1/30 is given as shown in figure below,
Assuming the wire of dipole is conductor 5.6*107
S/m, determine at f=1 GHz the
a- Loss resistance, b- Radiation efficiency
c- Reflection efficiency when the antenna is
connected to T.L shown in the figure.
Rr
Ro= 50 2
Avg/4
RL
-j100
[In(l/a) 1.5]
tan(ẞ1)
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Power System Analysis and Design (MindTap Course ...Electrical EngineeringISBN:9781305632134Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. SarmaPublisher:Cengage Learning