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Answer Posted / 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.
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