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

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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.
Transcribed Image Text: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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