Transformers helps in transforming the power from one circuit to another without any frequency change. When a magnetic field fluctuates around a piece of wire, it generates an electric current in the wire. So if we put a second coil of wire next to the first one, and send a fluctuating electric current into the first coil, we will create an electric current in the second wire.

1. Types of
Transformers
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2. Step-down
A Step-Down Transformer is a device which
converts high primary voltage to a low
secondary voltage. In a Step-Down Transformer,
the primary winding of a coil has more turns
than the secondary winding. In main adapters
and chargers for cell phones, stereos and CD
players To step down the voltage level in
transmission line In welding machines by
reducing voltage and increasing current.
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3. Step-up
In a Step-Up Transformer, there are more
turns on the secondary coil compared to
the primary coils. The current which flows
across the Primary coil is much higher
compared to secondary coil. Inverters and
Stabilizers where in the Transformers help
in stabilizing the low voltage to the higher
voltage. Transmit the electricity at lower
prices for a longer distance. 3

4. Isolation Type
Isolation transformers provide separation
from the power line ground connection to
eliminate ground loops and inadvertent test
equipment grounding. They also suppress
high frequency noise riding on the power
source.
Use: Reduces Surges, Enhances Safety,
Increases Power Quality, Reduces Noise
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5. Single Phase
A type of transformer which consists of
only one pair of the transformer coils or
windings, i.e., one primary winding and one
secondary winding, and is used for
transforming.
Transformers operate on the principle of
mutual induction, which is the process of
inducing a voltage in a coil by changing the
current in another coil.
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6. Instrument Type
The basic purpose of the Instrument
transformer is to step down the alternating
(ac) power system voltage and current and
measure the respective signal.
In electrical engineering, a Current
Transformers (CT) together with Potential
Transformers (PT) is called an Instrument
transformer.
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7. Iron Core Type
Iron core is to channel the magnetic
flux generated by the current flowing
around the primary coil, so that as
much of it as possible also links the
secondary coil.
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8. Three Phase
The primary winding of the three-
phase transformer is energized from a
three phase supply. Then, the flux is
produced in the core by the primary
currents in the three windings. The
core has three limbs, where any two
limbs act as return path for the flux in
the third limb.
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9. Ferrite Core
A type of magnetic core made of ferrite on
which the windings of electric transformers
and other wound components such as
inductors are formed. Ferrite cores are used
to suppress electromagnetic emissions by
blocking low-frequency noise and absorbing
high-frequency noise. This avoids
electromagnetic interference.
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10. Earthing Type
Used for the purpose of providing a
neutral point for grounding purpose
in a system where the neutral point of
a three-phase system are not available
or where the transformers or
generators are delta connected.
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11. Power Type
Power transformer is very widely
used for stepping up and stepping
down the voltage at the electrical
power generating station and
distribution station (or substation)
respectively.
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12. Toroidal Core
Toroidal transformers provide
increased design flexibility, efficiency,
and compactness when compared to
traditional shell and core type
transformers. They are an ideal
solution for low-KVA (up to 15 KVA)
rated devices.
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13. Current Type
A current transformer is designed to
maintain an accurate ratio between the
currents in its primary and secondary
circuits over a defined range. The
alternating current in the primary produces
an alternating magnetic field in the core,
which then induces an alternating current
in the secondary.
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