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TRANSFORMERS
OVERVIEW» 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.
DEFINITION
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.
HISTORY
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.
WORKING PRINCIPAL
Why do we use transformers?» To reduce the voltage or increase it between the
primary and the secondary sides
Why do we use transformers?
» 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.
CLASSIFICATION
Distribution transformer
Platform mounted transformer
AC to DC transformer
AC to DC Transformer in Details
» The coil Usually cupper and Aluminum are used to buildthe coil to reduce the resistance» winding
» The core
MANUFACTURING
MANUFACTURING» Video Linkhttp://www.youtube.com/watch?v=ANK--5Fu518
References1. 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/products/0071494626/CroftCh5.pdf
3. http://en.wikipedia.org/wiki/Transformer4. http://
www.powerwise.org.uk/ollieandsparky/teachers/OC3.html
5. http://www.youtube.com/watch?v=ANK--5Fu518