In which of the following transforms, is the secondary winding always kept closed ?a)Current transformerb)Potential transformerc)Power transformerd)Distribution transformerCorrect answer is option 'A'. Can you explain this answer?

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In which of the following transforms, is the secondary winding always kept closed ?

a)
Current transformer
b)
Potential transformer
c)
Power transformer
d)
Distribution transformer

Correct answer is option 'A'. Can you explain this answer?

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In which of the following transforms, is the secondary winding always ...

Unless a burden (i.e. meters, relays, etc.) is connected to the CT, current transformers should always be shorted across the secondary terminals. The reason is very high voltages will be induced at the terminals. Think of the CT as a transformer, with a 1 turn primary and many turns on the secondary. When current is flowing through the primary, the resulting voltage induced in the secondary can be quite high, on the order of kilovolts. When a CT fails under open circuit conditions, the cause of failure is insulation breakdown, either at the shorting terminal strip, or at the feedthrough (in the case of oil filled apparatus), because the distances between terminals are not sufficient for the voltages present.
Hence, the secondary winding always kept closed is Current transformer.

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In which of the following transforms, is the secondary winding always kept closed ?a)Current transformerb)Potential transformerc)Power transformerd)Distribution transformerCorrect answer is option 'A'. Can you explain this answer?

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