Answer Posted / c.hari balakrishnan

Instrument transformers (potential & Current)used for
protection and metering purpose...Current transformers
which is used for protection is normally 5P20 class,
for differential protection i.e, PX class cts & Metering
0.2FS5 class Cts whose saturation value is very less...
For Voltage transformers 0.2 & 3P class for
metering,Protection...

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