Transcript File - new open world

Welcome
to my
Presentation
On
Transformer
Presented By
Emon Arifin Shakil
ID#09305034
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Step down transformer
Step up transformer
Core type Transformer
Shell type transformer
Spiral core type transformer
Distribution Transformer
Power Transformer
Current transformer
Potential transformer
Single phase transformers
Poly phase transformer
Components of a Transformer
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Winding
Iron core
Transformer tank
Yoke
Conservator
Transformer Oil
Bushing
Oil level indicator
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Breather
Radiator tubes for cooling
Tap changer
Buchholz relay
Thermo-meter
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Types of winding
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Cylindrical winding
Distributed Cross-over Windings
Spiral Winding
Helical Winding
Fig: Cylindrical winding
Fig: Spiral winding
Fig: Helical winding
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Bushing
• The bushing provides
insulation of the terminals
of winding. These bushings
are made of well china
clay. These are housed on
the upper side of tank
through gasket. Service
line and terminals of the
winding
is
connected
through bushing.
• High side bushings are
large
and
low
side
bushings are small
Low voltage bushing
High voltage bushing
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Conservator
• It is transformer oil storage
tank and if the main tank oil
reduces the conservator will
feed the oil to main tank.
• And if the oil get expansion
that oil will go to
conservator
Fig: Conservator
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Breather
• A transformer breather is an•
accessory of an oil filled type
transformer which is attached
into the oil conservator tank.
• It protect moisture entering
the conservator tank.
• In the refrigeration breather
system, an air dryer is fitted
to the conservator vessel.
Sili
ca
gel
• Fig: Breather
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Assembling of Transformer
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Connection
• LT/secondary winding uses delta
connection
• HT/primary winding uses star or
Y connection
• A delta system is a good shortdistance distribution system.The
delta system can be illustrated by
a simple triangle. A wire from
each point of the triangle would
represent a three-phase, three-wire
delta system. The voltage would
be the same between any two
wires.
• Description of star connection
Fig: Delta- Wye connection
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Cont.
• Y Y Connection Use :
rare, don't use causes
harmonics and
balancing problems
• Y Δ Connection Use :
high voltage
transmissions.
• Δ Δ Connection Use:
Industrial applications.
Fig: Wye-Wye connection
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Cont.
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