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Definition: A transformer is a device that changes AC electric power at
one voltage level to ac electric power at another voltage level through the
action of magnetic field.
The basic principle behind working of a transformer is the phenomenon of
mutual induction between two windings linked by common magnetic flux.
Basically a transformer consists of two inductive coils; primary winding and
secondary winding. The coils are electrically separated but magnetically
linked to each other. When, primary winding is connected to a source of
alternating voltage, alternating magnetic flux is produced around the
winding. The core provides magnetic path for the flux, to get linked with the
secondary winding & EMF is induced in secondary winding.
Cold rolled grain oriented silicon steel
Magnetic flux density more size is less
Due to Pulsating flux, core should be laminated
Transformer of larger size may forms in cut “C” or cut “E” type.
Core is made with laminated steel sheet in all type of
transformers to provide continuous magnetic path and also
to provide minimum air gap
It is a main part of transformer. It is steel made box. Transformer core is
placed inside this tank. Windings and other helpful devices are placed
inside this tank. It is filled with insulating oil ( mineral oil ). It have usually
cylindrical or cubical shape depending on transformer construction. It is
coated internally and externally with colour for safety point of view. Colour
coating also provide protection in case of winding connection with tank
Chemical name or formula name of usually using in transformer is
DIFLORO DICHLORO ETHYL BENZENE
Insulating oil in an electrical power transformer is commonly known as
Transformer Oil. It is normally obtained by fractional distillation and
subsequent treatment of crude petroleum. That is why this oil is also
known as Mineral Insulating Oil.
Transformer oil or insulating oil is usually a highly-refined mineral oil that
is stable at high temperatures and has excellent electrical insulating