A Transformer is a static electrical device that transfer electrical energy between two or more circuit through electromagnetic induction.

  • A varying current in one coil of the transformer produces a varying magnetic field, which in turn induces a varying electromotive force or EMF in a second coil.
  • Power can be transferred between the two coils, with out a metallic connection between the two circuit.
  • There are Several transformer types used in the electrical power system for different purposes, like in power generation, distribution and transmission and utilization of electrical power



    Types of Transformer.

        There are seven Categories of Transformer.

    1. According to Construction.
    2. According to Core Medium.
    3. According to Voltage Level.
    4. According to Types of Supply.
    5. According to their Use.
    6. According to Instrument.
    7. According to the place of use.

    According to Construction.

    • The construction of a transformer is dependent upon how the primary and Secondary winding’s are wound around the central laminated steel core.
    • The two most common and basic designs of transformer construction are there:
      1.   Core Type Transformer
      2.   Shell Types Transformer.

      Core Type Transformer. 

      The cylindrical coils have different layers and each layers is insulated from each other.

      Low voltage winding are placed nearer to the core, as they are easier to insulate.

      Shell Type Transformer

      The coils are former wound and mounted in layers stacked with insulated betwween them ,A shell type transformer may have simple rectangular form or it may have a distributed from.

      According to core Medium

      Based on the medium placed between the primary and secondary winding the transformers as classified as .

      1. Air core Transformer.

      1. Iron core Transformer.

      Air Core Transformer.

      The primary and Secondary winding wounded on non-magnetic strip where the flux linkage between primary and secondary is through the air.

      The mutual inductance effect is much less in air core compared to iron core i.e the reluctance offered to the generated flux is high in the air medium where as in the iron core it is less.But the hysteresis and eddy current losses which are dominant in iron core type are less or completely eliminated in air core types transformer.

      Iron Core Transformer.

      The primary and secondary winding are wound on multiple iron plate bunch which provide a perfect linkage path to the generated flux .

      It offers less reluctance to the linkage. flux due to the conductive and magnetic property of the iron.

      These are extensively used transformers in which the performance is excessive in comparison to the air core type transformer

      According to Voltage Level

      Those are the maximum commonly used transformer sorts for all of the applications  rely upon the voltage ratio from number one to secondary winding the transformers are labeled as

                    Step-down Transformer 

               Step- up Transformer

       Step-up Transformer

       There are more turns on the secondary coil then the primary coil.

      The induced voltage throughout the secondary coil is extra than the applied voltage throughout the primary coil or in the different words the voltage has been stepped-up.

      Step-down Transformer

      A transformer has less activates the coil that the first coils

      The induced voltage across the secondary coil is much less the carried out voltage throughout the number one coil or in different phrases the voltage is stepped-down.

      According to Types of Supply

      These are the maximum commonly used transformer kinds for depends on supply line.These are classified as,

      Single phase and Three phase Transformer. 

      Single phase Transformer

      Single phase Transformer accept single-phase AC Power and output Single-phase Power, Typically at a higher or lower voltage level.

      Energy is transfer from one circuit to one or more circuit via electromagnetic induction.

      Three Phase Transformer

      3 phase electric electricity is a commonplace approach of alternating -modern-day electric powered electricity generation, transmission and distribution.

      It is a type of poly phase system and is the most common method used by electrical grid worldwide to transfer power.

      According to the use

      According to the requirement, these are classified as the power transformer,

      Distribution transformer measuring transformer, and instrument transformer.

      Power Transformer

      A Transformer located directly next to a power plant is called GSU Generator Step-up unit.

      A GSU Transformer the electric power from the medium voltage of the generators to the high voltage transmission level.

      To balance power flow between parallel power line, phase sifter can be used.

    • Distribution Transformer

      A distribution transformer or provider transformer is a transformer that provides the very final voltage transformation in the electric power distribution system , stepping down the voltage used in the distribution line to the level used by the consumer.

      Instrument Transformer

      Instrument Transformer are high accuracy magnificence electric devices, used to isolate or transform voltage or ampere level.

      Instrument transformer are classified as , Current Transformer and Potential Transformer

    • .Current Transformer

      A current transformer is a electric  device that produced an alternating current in its secondary which is proportional to the AC current in its primary.

      Potential Transformer

      Voltage Transformer ,also called  Potential Transformers PT, are a Parallel connected type of instrument Transformer.

      They are designed to present negligible load to the supply being measured and have an accurate voltage ratio and phase  relationship to enable accurate secondary connected metering.

      Indoor and outdoor Transformer 

      These are classified as indoor and outdoor Transformer.

      • Indoor transformers are covered with a right roof like as inside the technique industry
      • The outdoor Transformers are nothing but distribution type Transformer.


Article Name
A Transformer is a static electrical device that transfer electrical energy between two or more circuit through electromagnetic induction.
Publisher Name
Ghulam Hyder
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