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.
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