Importance of Voltage Control Location of Voltage Control Methods of Voltage Control Tap-changing Transformer Induction Regulators Conclusion

1. Methods of Voltage Control
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Nishan Joarder - 172-33-3988
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2. Contents
• Importance of Voltage Control
• Location of Voltage Control
• Methods of Voltage Control
• Tap-changing Transformer
• Induction Regulators
• Conclusion

3. Importance of control
• To safeguard the interest of consumers.
• According to LAW voltage variation can't be more than ±6%
• Too wide variation of voltage cause excessive heating of distribution
transformer. This may reduce their ratings to be considerable extent.
Ref: Principles of Power System, V.K. Mehta, Rohit Mehta, Chapter - 15

4. Location of voltage control
Genera
ting
Transfo
rmer
Feeder
s
Ref: Principles of Power System, V.K. Mehta,
Rohit Mehta, Chapter - 15

5. Methods of voltage control
1) Excitation control.
2) Tap-changing transformer.
3) Auto-transformer Tap-changing.
4) Booster transformer.
5) Induction regulators.
6) Synchronous condenser.
Ref: Principles of Power System, V.K. Mehta, Rohit Mehta, Chapter - 15

6. Tap-changing Transformer
One important method is to use tap
changing transformer and is
commonly employed where main
transformer is necessary. In this
method, a number of tappings are
provided on the secondary of the
transformer. The voltage drop in the
line is supplied by changing the
secondary e.m.f. of the transformer
through the adjustment of its number
of turns.
Ref: Principles of Power System, V.K. Mehta, Rohit Mehta, Chapter - 15

7. Induction regulators
• An induction regulator is essentially a
constant voltage transformer, one winding of
which can be moved w.r.t. the other, thereby
obtaining a variable secondary voltage. The
primary winding is connected across the
supply while the secondary winding is
connected in series with the line whose
voltage is to be controlled. When the position
of one winding is changed w.r.t. the other,
the secondary voltage injected into the line
also changes. There are two types of
induction regulators viz. single phase and 3-
phase.
Ref: Principles of Power System, V.K. Mehta, Rohit Mehta, Chapter - 15

8. Classification of Induction regulators
1 phase 3 phase
Ref: Principles of Power System, V.K. Mehta, Rohit Mehta, Chapter - 15

9. Anyone have any questions??

10. That’s all for today
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