Answer / suneetha

ct used for protection has to carry full load current and
fault current.ct core shudnt get saturated while carryin
fault current.So the ct used for protection shud hav high
saturation factor.But ct used for measuring shud hav high
accuracy

Answer / gunasekaran

protection ct is operating below the knee point voltage but
metering ct is operating almost saturation point.accuracy is
more in metering ct accuracy is not important under normal
condition. metering ct accuracy is 25%to 120% of the rated
current but protection ct is not like that suppose the ct
5P10 and 20VA burden 10times current in primary 5% error is
acceptable up to 10 times current it will feed 20VA burden

Answer / d.lakshmi narayana

The difference of protection ct & measuring ct is the
protection ct secondary current is very accuracy .Ex 600/1A
ct is the sec current is Exactly coming 1A But metering ct
is not accuracy That same ct is coming Sec current is
0.98--0.97 A

Answer / ahir ashish

protection ct is depand upon the ratio error and measureing
ct is depand upon phase angle error.

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