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Key Difference Between Power Transformer and Distribution Transformer

  • Power transformers are used in the transmission network of higher voltages whereas the Distribution Transformers are used in the distribution network of lower voltages.
  • The power transformers are available in various ratings of 400 kV, 200 kV, 110 kV, 66 kV, 33 kV in the market and the distribution transformer are available in 11 kV, 6.6 kV, 3.3 kV, 440 V, 230 Volts.
  • The power transformer always operates on rated full load as the load fluctuation is very less but the distribution transformer is operated at the load less than full load as the variation in the loads are very high.
  • The power transformers are designed for maximum efficiency of 100%, and the efficiency is simply calculated by the ratio of output power to the input power, whereas the distribution transformer the maximum efficiency varies between 50-70% and calculated by All Day Efficiency.
  • Power transformers are used in power generating stations and transmission substations, and the distribution transformer is installed at the distribution stations from where the power is distributed for the industrial and domestic purposes.
  • The size of the power transformer is large as compared to the distribution transformers.
  • In Power Transformer, the iron and copper losses take place throughout the day but in distribution transformer, the iron loss takes place 24 hours i.e., throughout the day, and the copper losses depend on the load cycle.
In this way, a power transformer is differentiated from a distribution transformer.