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 disconnect during light load conditions therefore the power transformer is designed to have maximum efficiency nearly full load.
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