Answer / a.ramachandran

current transformer : transformation of high current into
required current rating of measuring instruments and
protection relays.

Potential transformer: step down the high voltage into low
voltage for the purpose of measuring instruments and
protection relays.

Answer / pragati kumar

Current Transformer(ct) is used to measure current in high
voltage ac circuit because it is not possible to measure
high voltage ac current with ammeter alone.Potential
Transformer(pt) is used to measure high ac voltage.

Answer / wasif arshad

Basically both CT and PT steps down the voltage but the difference is that in CT primary is not winded on the core and both the terminals of secondary are connected to ampere meter of appropriate transformation ratio while in pt both primary and secondary are wounded on the core like a simple step down transformer and both terminals of primary are connected to the high voltage and secondary to the voltmeter to give deflection according to scale of voltmeter having the same transformation ratio shown on PT.

Answer / mrudang

ct and pt both we are using for protection

Answer / sanjay kumar

current transformer(ct)works to reduce the current for
measuring equipment or protection relay bcoz ct works as a
step up transformer.
potential transformer(pt)works to the voltage for measuring
equipment or protection relay bcoz pt works as astep down
transformer.

how do u calculate CT rating for 10 mva transformer

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