So what is transformer all things considered? A straightforward transformer definition is that it is a static electrical gadget which changes the electrical energy starting with one electrical circuit then onto the next with no difference in recurrence through the interaction of electromagnetic acceptance.

Definition of Transformer

Transformer What is Transformer types of transformer definition of transformer

It is fascinating to take note of that the exchange of energy starting with one circuit then onto the next happens with the assistance of shared acceptance that is motion incited in the essential winding gets connected with the auxiliary winding which we will clarify in some time. Transformer Failure can likewise happen if proper consideration isn’t taken for it’s activity.


Working of transformer


The working of transformer depends on the straightforward guideline of shared acceptance between the essential and optional windings which is also called curls, which causes for to change the energy starting with one circuit then onto the next. Presently how about we attempt to comprehend the general picture: So as a rule the essential curl of the transformer gets the voltage which is exchanging in nature. The rotating current after the curl creates a persistently changing and substituting motion which is delivered around the essential winding. At that point we have the other loop or the optional curl which is close to the essential loop which get connected to the essential since some exchanging transition gets connected. As the transition is changing ceaselessly it prompts an EMF instigated in the auxiliary curl as per the Faraday’s law of electromagnetic acceptance. In the event that the auxiliary side circuit is shut a current will stream and this is the most fundamental working of a transformer.


Development of 3 stage transformer


The three fundamental piece of any transformer are the essential winding, optional winding and the attractive center. We will now into every one of this parts in detail.

Primary Winding

Secondary Winding

Magnetic Core

Primary  Winding


This is the primary winding where the approaching rotating current is normal. Contingent upon the way that the transformer is either a stage up or venture down transformer the winding development changes appropriately

Secondary  Winding


This is the twisting wherein the motion created by the essential winding get connected. For this situation likewise relying upon the way that the transformer is either a stage up or venture down transformer the winding development changes as needs be.

Magnetic Core


This is needed to give a low hesitance way to the attractive transition to move from the essential twisting to the optional twisting to shape a nearby attractive circuit. It is generally comprised of CRGOS (Cold Rolled Grain Oriented Silicon Steel).

Types of Transformer


There are different kinds of transformer utilized in the electrical force framework for various purposes, similar to age, conveyance and transmission and usage of electrical force.


The various kinds of transformer are Step up and Step down Transformer, Power Transformer, Distribution Transformer, Instrument transformer including current and Potential Transformer, Single stage and Three stage transformer, Auto transformer, and so forth

  • Step up and Step-down Transformer
  • Power Transformer
  • Distribution Transformer
  • Instrument Transformer
  • Current Transformer
  • Potential Transformer
  • Single Phase Transformer
  • Three Phase Transformer


Step up and Step down Transformer


This kind of transformer is arranged based on various turns in the essential and auxiliary windings and the prompted emf.


Step-up transformer changes a low voltage, high current AC into a high voltage, low current AC framework In this kind of transformer the quantity of turns in the auxiliary winding is more prominent than the quantity of turns in the essential winding. In the event that (V2 > V1) the voltage is raised on the yield side and is known as Step-up transformer


Step down transformer changes over a high essential voltage related with the low current into a low voltage, high current. With this sort of transformer, the quantity of turns in the essential winding is more noteworthy than the quantity of turns in the optional winding. On the off chance that (V2 < V1) the voltage level is brought down on the yield side and is known as Step down transformer

Power Transformer


The force transformers are utilized in the transmission organizations of higher voltages. The evaluations of the force transformer are as per the following 400 KV, 200 KV, 110 KV, 66 KV, 33 KV. They are chiefly evaluated over 200 MVA. Fundamentally  introduced at the creating stations and transmission substations. They are intended for greatest productivity of 100%. They are bigger in size when contrasted with the conveyance transformer.


At a high voltage, the force can’t be disseminated to the shopper straightforwardly, so the force is ventured down to the ideal level with the assistance of step-down force transformer. The transformer isn’t stacked completely thus the center misfortune happens for the entire day, yet the copper misfortune depends on the heap pattern of the conveyance organization.


On the off chance that the force transformer is associated in the transmission organization, the heap vacillation will be less as they are not associated at the purchaser end straightforwardly, yet whenever associated with the appropriation network there will be changes in the heap.


The transformer is stacked for 24 hours at the transmission station, consequently, the center and copper misfortune will happen for the entire day. The force transformer is practical when the force is produced at low voltage levels. On the off chance that the degree of voltage is raised, the current of the force transformer is decreased, bringing about I2R misfortunes and the voltage guideline is additionally expanded.

Distribution Transformer


This kind of transformer has lower evaluations like 11 KV, 6.6 KV, 3.3 KV, 440 V and 230 V. They are appraised under 200 MVA and utilized in the appropriation organization to give voltage change in the force framework by venturing down the voltage level where the electrical energy is distributed and utilized at the purchaser end.

The essential curl of the distribution transformer is twisted by polish covered copper or aluminum wire. A thick strip of aluminum and copper is utilized to make auxiliary of the transformer which is a high current, low voltage winding. Pitch impregnated paper and oil is utilized for the protection reason.


The oil in the transformer is utilized for


  • Cooling
  • Insulating the windings
  • Protecting from the moisture



The different kinds of the distribution transformer are ordered on the accompanying premise and are appeared in the figure underneath


  • Mounting area
  • Type of protection
  • Nature of supply
Mounting Area
  • Pole Mount Transformer
  • Pad Mount Transformer
  • Underground Transformer
Type of Protection
  • Liquid immersed
  • Dry type
Nature of Supply
  • Single Phase Supply
  • Three Phase Supply

The distribution transformer under 33 KV is utilized in businesses and 440, 220 V is utilized for the homegrown reason. It is more modest in size, simple to introduce and has low attractive misfortunes and isn’t constantly stacked completely.


As it doesn’t work for steady burden all through 24 hours as in the daytime its heap is at its pinnacle, and during the night hours it is softly stacked hence the proficiency relies upon load cycle and is determined as All Day Efficiency. The distribution transformers are intended for greatest proficiency of 60 to 70%


Instrument Transformer


  • They are by and large known as a confinement transformer. Instrument transformer is an electrical gadget used to change flow just as a voltage level. The most well-known utilization of instrument transformer is to securely separate the auxiliary winding when the essential has high voltage and high current inventory so the estimating instrument, energy meters or transfers which are associated with the optional side of the transformer won’t get harmed. The instrument transformer is additionally partitioned into two sorts


  • Current Transformer (CT)
  • Potential Transformer (PT)


The current and potential transformer is clarified beneath in detail


Current Transformer


  • The current transformer is utilized for estimating and furthermore for the assurance. At the point when the current in the circuit is high to apply straightforwardly to the estimating instrument, the current transformer is utilized to change the high current into the ideal estimation of the current needed in the circuit.


The essential twisting of the current transformer is associated in arrangement to the primary inventory and the different estimating instruments like ammeter, voltmeter, wattmeter or defensive transfer loop. They have precise, current proportion and stage connection to empower the meter precisely on the optional side. The term proportion has an incredible importance in CT.


For instance, if its proportion is 2000:5, it implies a CT has a yield of 5 Ampere when the information current is 2000 amp on the essential side. The exactness of the Current Transformer relies on numerous variables like Burden, load, temperature, stage change, rating, immersion, and so on


In the current transformer, the all out essential current is the vector amount of the excitation current and the current equivalent to the inversion of optional current increased by turn proportion.



Potential Transformer


The potential transformer is likewise called as the voltage transformer. The essential winding is associated across the High voltage line whose voltage is to be estimated, and all the estimating instruments and meters are associated with the auxiliary side of the transformer.


The principle capacity of the Potential transformer is to venture down the voltage level to a protected cutoff or worth. The essential twisting of the potential transformer is earthed or grounded as a security point.


For instance, the voltage proportion essential to auxiliary is given as 500:120, it implies the yield voltage is of 120 V when the 500 V is applied to the essential. The various kinds of potential transformer are appeared beneath in the figure

  • Electromagnetic (it is a wire wound transformer)
  • Capacitor (capacitor voltage transformer CVT utilizes capacitor voltage divider)
  • Optical (chips away at the electrical property if optical materials)



Single Phase Transformer


A solitary stage transformer is a static gadget, deals with the guideline of Faraday’s law of shared Induction. At a steady degree of recurrence and variety of voltage level, the transformer moves AC power from one circuit to the next circuit. There are two sorts of windings in the transformer. The twisting to which AC supply is given is named as Primary twisting and in the auxiliary winding, the heap is associated.


Three Phase Transformer


In the event that the three single-stage transformer is taken and associated along with their all the three essential twisting associated with one another as every last one the three optional windings to one another, framing as one auxiliary winding, the transformer is said to act as a three-stage transformer, that implies a bank of three single-stage transformer associated together which goes about as a three-stage transformer.

Primary Winding Secondary Winding
Star (Wye) Star
Delta (mesh) Delta
Star Delta
Delta Star


Three-stage supply is for the most part utilized for electric force age, transmission and appropriation for modern reason. It is less exorbitant to gather three single-stage transformer to shape a three-stage transformer than to buy one single three-stage transformer. The three-stage transformer association should be possible by Star (Wye) and Delta (Mesh) type.


The association of essential and optional winding should be possible by different mixes appeared underneath


The blend of the essential winding and the auxiliary winding is done as star-star, delta-delta, star-delta and delta-star.

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