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TRANSFORMERS
There are primary and secondary
windings in transformer.The
primary winding is connected to
supply and secondary winding is
connected to load.The turn’s
ratio of transformer is
N2/N1=E2/E1=I1/I2
TOTAL PRIMARY RESISTANCE
If the turn’s ratio of the
transformer is K
Secondary resistance referred to
primary =R2/k^2
Primary resistance referred to
secondary=R1^K^2
NO LOAD TEST AND
SHORTCIRCUIT TEST
If the secondary is on no load the Power
measured in primary is coreloss in both
singlephase and threephase transformers.If the
secondary is short circuited the power
measured in primary is copperloss in both
singlephase and threephase transformers
The efficiency is maximum when
core loss is equal to copper loss

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Transformer

  • 1. TRANSFORMERS There are primary and secondary windings in transformer.The primary winding is connected to supply and secondary winding is connected to load.The turn’s ratio of transformer is N2/N1=E2/E1=I1/I2
  • 2. TOTAL PRIMARY RESISTANCE If the turn’s ratio of the transformer is K Secondary resistance referred to primary =R2/k^2 Primary resistance referred to secondary=R1^K^2
  • 3. NO LOAD TEST AND SHORTCIRCUIT TEST If the secondary is on no load the Power measured in primary is coreloss in both singlephase and threephase transformers.If the secondary is short circuited the power measured in primary is copperloss in both singlephase and threephase transformers
  • 4. The efficiency is maximum when core loss is equal to copper loss