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Current Transformer Vs Potential Transformer

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Macroplast Transformers
Current Transformer Vs Potential Transformer


Current Transformer

  • The Current Transformer is used for measure High Current.
  • It is a step up Transformer.
  • High current is stepped down into the low current in this transformer.
  • To transport the measured current and the entire line current, the principal winding of the Current Transformer only has a few turns (and occasionally just one turn).
  • Since CT is connected in series with the supply, a minor voltage is present across its input terminals.
  • The primary current is unaffected by the state of the secondary circuit.
  • More turns of thinner wire are used in the secondary winding, which is connected across the lower range of the ammeter.
  • Never run the secondary of the CT in open circuit conditions.
  • In order to prevent high voltage from being induced into the multi turn secondary of the Current Transformer, the secondary must always be shorted.
  • Under short circuit circumstances, the CT can be treated as a series transformer.

Potential Transformer

  • High voltage measurements are performed using the potential transformer.
  • It is a transformer that steps down. It converts high voltage to low voltage in stages.
  • The voltage to be measured is linked to the primary winding of Potential Transformer, which has many turns of thin wire.
  • Full line voltage is impressed on the primary winding.
  • Its input terminals show full line voltage.
  • The secondary circuit conditions affect the primary current.
  • The secondary winding is connected across the low range voltmeter and has only a few twists of thick wire.
  • Under open circuit conditions, the secondary of the PT is almost utilized.
  • For safety reasons, the secondary winding needs to be grounded and entirely isolated from the high voltage main.
  • Under open circuit circumstances, PT can be treated as a parallel transformer.


Macroplast is one of the leading and major Current Transformers Manufacturers & Potential Transformers Suppliers in India, Africa and European Countries. To know more about the products and pricing, Please on the highlighted link.

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