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Classify the transformers based on the construction, frequency and power.

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Classification of Transformer Based On: i) Construction: Shell type, Core type, Berry type ii) Change in voltage level: Step-Up, Step-Down, iii) Number of phases: Single phase, Three phase iv) Purpose: Power T/F, Distribution T/F v) Use: Instrument, Protection, Control vi) Cooling: Self-cooled, Air-cooled, Forced-air cooled, Oil-cooled, Forced-oil cooled. 

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