Consider a three-phase generator rated 3 00 MVA , 23 kV , supplying a system load of 240 MA and 0.9 power factor lagging at 230 kV through a 33 0 MVA , 23 Δ / 23 0 Y-kV step-up transformer with a leakage reactance of 0.11 per unit. (a) Neglecting the exciting current and choosing base values at the load of 100 MVL and 230 kV. Find the phasor currents I A , I B , and I C supplied to the load in per unit. (b) By choosing the load terminal voltage I A as reference, specify the proper base for the generator circuit and determine the generator voltage V as well as the phasor currents I A , I B , and I C , from the generator. ( Note: Take into account the phase shift of the transformer.) (C) Find the generator terminal voltage in kV and the real power supplied by the generator in MW. (d) By omitting the transformer phase shift altogether, check to see whether you get the same magnitude of generator terminal voltage and real power delivered by the generator.
Consider a three-phase generator rated 3 00 MVA , 23 kV , supplying a system load of 240 MA and 0.9 power factor lagging at 230 kV through a 33 0 MVA , 23 Δ / 23 0 Y-kV step-up transformer with a leakage reactance of 0.11 per unit. (a) Neglecting the exciting current and choosing base values at the load of 100 MVL and 230 kV. Find the phasor currents I A , I B , and I C supplied to the load in per unit. (b) By choosing the load terminal voltage I A as reference, specify the proper base for the generator circuit and determine the generator voltage V as well as the phasor currents I A , I B , and I C , from the generator. ( Note: Take into account the phase shift of the transformer.) (C) Find the generator terminal voltage in kV and the real power supplied by the generator in MW. (d) By omitting the transformer phase shift altogether, check to see whether you get the same magnitude of generator terminal voltage and real power delivered by the generator.
Consider a three-phase generator rated
3
00
MVA
,
23 kV
, supplying a system load of 240 MA and 0.9 power factor lagging at 230 kV through a
33
0
MVA
,
23
Δ
/
23
0
Y-kV
step-up transformer with a leakage reactance of 0.11 per unit. (a) Neglecting the exciting current and choosing base values at the load of 100 MVL and 230 kV. Find the phasor currents
I
A
,
I
B
,
and
I
C
supplied to the load in per unit. (b) By choosing the load terminal voltage
I
A
as reference, specify the proper base for the generator circuit and determine the generator voltage V as well as the phasor currents
I
A
,
I
B
,
and
I
C
,
from the generator. (Note: Take into account the phase shift of the transformer.) (C) Find the generator terminal voltage in kV and the real power supplied by the generator in MW. (d) By omitting the transformer phase shift altogether, check to see whether you get the same magnitude of generator terminal voltage and real power delivered by the generator.
in distribution transformers; What is 30 degrees phase shift in delta-star connection? What are the disadvantages? (can you explain with drawing?)
How to generate 480V three phase 400Hz ac from 230V three phase 60Hz ac source?
(Please specify the power components you pick, such as transformers, dc-dc converter, dc-ac converter and/or ac-dc converter, how these components are connected and the key parameters of these components, such as the turns ratio of transformer and the duty cycle functions for the converters.)
The impedance ZL in the circuit shown in Figure is adjusted for maximumaverage power transfer to itself.(a) What should be the value of ZL?(b) What is the maximum average power delivered to ZL?(c) What percentage of the average power delivered to the linear transformer is delivered to ZL?
Chapter 3 Solutions
Power System Analysis and Design (MindTap Course List)
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