G1=2G2=4G3=2G4=7G5=2G6=1G7=2 Indicate the relevant changes in transformer performance (output voltage,losses, regulation, no load current, power factor etc) and/or operating limits(maximum voltage and current) for the following changes to a transformerdesign:Q3 (a)(i)A reduction in the magnetising reactance.(ii)An increase in the leakage reactance.(iii)An increase in the iron loss resistance (Re).(iv)An improved cooling system for the transformer windingsParameter ValueUnitsХм1.0RC3.68.34ΩRiegXieq30ΩTable Q3bA 0.4Gs 2 resistance is connected to the secondary winding of a singlephase 230 V/12 V transformer with the equivalent circuit parameters shownin Table Q3b.(b)Using this information determine the following:(i) The transformer turns ratio.(ii) The output voltage and output power (W) under load.(iii) The regulation and efficiency under load.(iv) The no load current and power factor.

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Indicate the relevant changes in transformer performance (output voltage, losses, regulation, no load current, power factor etc) and/or operating limits (maximum voltage and current) for the following changes to a transformer design: (i) A reduction in the magnetising reactance. (ii) An increase in the leakage reactance. (ii) An increase in the iron loss resistance (Rc). (iv) An improved cooling system for the transformer windings

Indicate the relevant changes in transformer performance (output voltage, losses, regulation, no load current, power factor etc) and/or operating limits (maximum voltage and current) for the following changes to a transformer design: (i) A reduction in the magnetising reactance. (ii) An increase in the leakage reactance. (ii) An increase in the iron loss resistance (Rc). (iv) An improved cooling system for the transformer windings

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.16MCQ: In developing per-unit circuits of systems such as the one shown in Figure 3.10. when moving across...

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Concept explainers

Thevenin Theorem

Any linear circuit, no matter how complex, maybe simplified to an equivalent circuit utilizing only a single voltage source and series resistance coupled to a load, according to Thevenin's Theorem. The superposition principle says that all foundational equations must be linear, and the notion of "linear" is still the same (i.e., there should not be any exponentials or roots). This is particularly the case when operating with passive elements like resistors, inductors, and capacitors. However, some components (particularly some gaseous and semiconductor devices like tunnel diode, Schottky diode, transistors like BJT, MOSFET) are nonlinear, meaning their current resistance fluctuates with voltage and current. As a result, circuits made up of these parts are known as nonlinear circuits.

Question

G1=2 G2=4 G3=2 G4=7 G5=2 G6=1 G7=2

Indicate the relevant changes in transformer performance (output voltage,
losses, regulation, no load current, power factor etc) and/or operating limits
(maximum voltage and current) for the following changes to a transformer
design:
Q3 (a)
(i)
A reduction in the magnetising reactance.
(ii)
An increase in the leakage reactance.
(iii)
An increase in the iron loss resistance (Re).
(iv)
An improved cooling system for the transformer windings
Parameter Value
Units
Хм
1.0
RC
3.6
8.34
Ω
Rieg
Xieq
30
Ω
Table Q3b
A 0.4Gs 2 resistance is connected to the secondary winding of a single
phase 230 V/12 V transformer with the equivalent circuit parameters shown
in Table Q3b.
(b)
Using this information determine the following:
(i) The transformer turns ratio.
(ii) The output voltage and output power (W) under load.
(iii) The regulation and efficiency under load.
(iv) The no load current and power factor.

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Step 3: Effect of reduction in magnetizing reactance

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Step 4: Effect of increment in leakage reactance

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Step 5: Effect of increment in core loss resistance

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