Voltage Regulation in Transformer
Voltage Regulation in Transformer
Definition of Voltage Regulation:
- The Voltage Regulation is defined as the voltage difference between no load and full load voltages of a transformer with respect to its full load voltage.
- This is usually expressed in terms of percentage.
Expression of Voltage Regulation of Transformer:
- Due to the voltage drop across primary and secondary impedences, it is observed that secondary terminal voltage drops from no load value(E2) to full load.
- This decrease in secondary terminal voltage expressed as a fraction of no load secondary voltage called regulation of a transformer.
- Let,
E2=secondary terminal voltage on no load
V2=secondary terminal voltage on full load
Mathematically, voltage regulation can be expressed as,
Voltage regulation(%)=(E2-V2)/V2*100
The ratio (E2-V2)/V2 is per unit regulation.
- As load current increases,the voltage drop tends to increase V2 and drops more and more.
- In case of lagging power factor V2<E2 ,we get positive voltage regulation but in case of leading power factor E2<V2,we get negative voltage regulation.
Voltage Regulation of Transformer at Lagging Power Factor:
Voltage Regulation(%) = {(E2-V2)/V2}*100%
= {(I2R2COSθ2+I2X2Sinθ2)/V2}*100%
Voltage Regulation of Transformer at Leading Power Factor:
Voltage Regulation(%) = {(E2-V2)/V2}*100%
={(I2R2Cosθ2-I2X2sinθ2)/V2}*100%
Some related Questions and Answers
Q1.Define Voltage Regulation.
Ans. The Voltage Regulation is defined as the voltage difference between no load and full load voltages of a transformer with respect to its full load voltage. This is usually expressed in terms of percentage.
Q2.Write the expression of voltage regulation of transformer.
Ans. Let,
E2=secondary terminal voltage on no load
V2=secondary terminal voltage on full load
Mathematically, voltage regulation can be expressed as,
Voltage regulation (%)= (E2-V2)/V2*100
The ratio (E2-V2)/V2 is per unit regulation.
Q3.What is the voltage regulation of transformer in case of lagging and leading power factor?
Ans. Voltage Regulation of Transformer at Lagging Power Factor:
Voltage Regulation (%) = {(E2-V2)/V2}*100%
= {(I2R2COSθ2+I2X2Sinθ2)/V2}*100%
Voltage Regulation of Transformer at Leading Power Factor:
Voltage Regulation (%) = {(E2-V2)/V2}*100%
= {(I2R2Cosθ2-I2X2sinθ2)/V2}*100%
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