14 February 2018

Compare Distribution Transformer and Power Transformer

Distribution transformer

  • The rating of the distribution transformer should be below 500 kVA. 
  • It is used for distribution of power at consumer end. 
  • It is designed maximum efficiency at 50% full load. 
  • Good all day efficiency. 
  • As it requires good voltage regulation, it is designed with small leakage reactance.
  • The distribution transformer primary is energized throughout the day whether it supplies load or not. Therefore the iron loss occurs throughout the day whereas the copper losses depend upon load. The iron loss is kept minimum in the distribution transformer due to above fact. 
  • The design of the distribution transformer is made such that it has iron losses small as compared to full load copper losses. Therefore the distribution transformer is designed for 50% efficiency.

Power transformer

  • The rating of the power transformer should be greater than 500 kVA. 
  • It is used in generating stations and substations at each end of power transmission line. 
  • It is designed for maximum efficiency nearly full load. 
  • As the voltage regulation has not considerable importance in the power transformer, it is designed with larger leakage reactance. 
  • The power transformer connected in operation during load condition and it will disconnected during light load conditions therefore the power transformer is designed to have maximum efficiency nearly full load.
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