Difference between Power and Distribution Transformer

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Power Transformer

  1. Power transformers are used in transmission network.
  2. Power transformers are rated above 200 MVA
  3. Power transformers works on high insulation level as voltage ranges above 33 kV i.e 33kV, 66kV, 110 kV, 200 kV, 400kV)
  4. Due to high insulation size of power transformers is large.
  5. Copper Losses in power transformers are less as it operates on 100% of loading 24 hours. 
  6. Efficiency of Power transformers is 99% .

Distribution Transformer

  1. Distribution Transformer used to distribute electricity to consumer level.
  2. Distribution transformers are rated up to 200 MVA
  3. Distribution transformers works on consumer level below 33 kV voltage, doesn't require high insulation.
  4. Due to low insulation size of Distribution transformers is small compared to Power transformer.
  5. Copper Losses in Distribution transformers are more as load is not constant for 24 hours.
  6. Efficiency of Distribution Transformer is 60% to 75%.