Types of transformers
                     Types of 
Transformers 
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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.
2
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
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
4
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.
5
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.
6
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.
7
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.
8
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.
9
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.
10
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.
11
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.
12
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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