Difference between power transformer and distribution transformer

The transformer is installed at various power stations for generation and transmission of power in power transformer. It acts as a step up or steps down transformer for increasing and decreasing the level of voltages as per the requirement and its also used as an interconnection between two power stations.

The distribution transformer is used to bring down or step down the voltage and current level of the transmission line to a predefined level, which is called safety level and interconnection between two power stations.

The key difference between the power transformer and distribution transformer is given below.

  • The power transformer is used in the transmission network of higher voltages whereas the distribution transformer is used in the distribution network of lower voltages.
  • Power transformer the iron and copper losses take place throughout the day but in distribution transformer, the iron loss takes place in 24 hours.
  • 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 load are very high.
  • The power transformer is available in a various rating of 400 K, 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 is designed for maximum efficiency of 100% and the efficiency is simply calculated by the ratio o the output power to the input power whereas the distribution transformer the maximum efficiency varies between 50 to 70% and calculated by all-day efficiency.
  • The power transformer has a large size as compared to the distribution transformer.
  • The fluctuation of the load in the power transformer is much less compared with the distribution transformer.
  • The density of flux in the power transformer is higher than in a distribution transformer.
  • In the substation at the end of the transmission line, the power transformer connection is star delta.
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