Transformer is ratted in KVA, Not in KW. Why ?

 


1. Transformer is a static device that is used to convert voltage and current from one level to another level without changing power and frequency.

2. Transformer having primary and secondary winding with magnetic core.

3. Transformer can step up or step down the supply voltage and current.

4. Transformer having two types of losses.

         1. copper loss

         2. Iron loss or core loss


5. copper losses of the transformer depend upon current (I) which is flowing through the primary and secondary winding.

6. Iron losses or core losses depend upon voltage (V).

7. So total losses i.e. copper losses and iron losses depend upon the current (I) and voltage (V) i.e. VI - Volt ampere.

8. So the transformer is rated in KVA instead of kW


Good To Know about the transformer:

  • The transformer only changing Voltage and current but frequency and Power remain unchanged.
  • Greater ratting the transformer higher the efficiency of the transformer.
  • The low voltage winding is wound on the inside nearer to the core while the high voltage (h.v.) winding is wound over the l.v. winding away from the core in order to reduce the amount of insulating materials required. 
  • A star-connected winding is characterized by a small number of turns with conductors having a large area of cross-section.
  • A delta-connected winding has a large number of turns with a small area of cross-section.


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