Transcript Transformers

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Definition
History
Working principle
Why do we use transformers?
Classification
Example
Manufacturing of transformers
Transformer is a power converter device that transfers energy between two
electrical circuits by inductive coupling between two or more windings. It
bring voltage up or down in ac electrical circuit and it can be used to convert
ac power to dc power.
Single-phase distribution
transformer in Canada use
like a power supply
facilities outside
settlements, such as
isolated houses.
The principle behind the operation
of a transformer, electromagnetic
induction, was discovered
independently by Michael Faraday
and Joseph Henry in 1830. But the
first transformer used was about
1886 by William Stanly which was
used in the electrification of great
Barrington , Massachusetts.
Stanly’s First transformer
The transformer is based on two principles: first, that
an electric current can produce a magnetic field
(electromagnetism) and second that a changing
magnetic field within a coil of wire induces a voltage
across the ends of the coil (electromagnetic induction).
Changing the current in the primary coil changes the
magnetic flux that is developed. The changing magnetic
flux induces a voltage in the secondary coil.
» To reduce the voltage or increase it between the
primary and the secondary sides
» To provide an economical way of transmitting
power over the long distances.
» Converting from AC to DC.
1. According to method of cooling.
Example: Self-air–cooled (dry type).
2. According to number of phases.
Example: Single-phase.
3. According to insulation between windings.
Example: Autotransformers.
4. According to method of mounting.
Pole and platform transformers
5. According to purpose.
Example: Constant voltage transformer.
6. According to service.
Example: Distribution transformer.
Distribution transformer
Platform mounted transformer
AC to DC transformer
AC to DC Transformer in Details
» The coil
Usually cupper and Aluminum are used to build
the coil to reduce the resistance
» winding
» The core
» Video Link
http://www.youtube.com/watch?v=ANK--5Fu518
1. Whelan, M. "The History of the Transformer." The
History of the Transformer. The Edison Tech Center,
n.d. Web. 21 Dec. 2012.
<http://edisontechcenter.org/Transformers.html>
2. http://www.mhprofessional.com/downloads/prod
ucts/0071494626/CroftCh5.pdf
3. http://en.wikipedia.org/wiki/Transformer
4. http://www.powerwise.org.uk/ollieandsparky/teac
hers/OC3.html
5. http://www.youtube.com/watch?v=ANK--5Fu518