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what is the CT of protection and CT of metering ? what is
class 5P10 & 5P20 and class PS ?
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Answer Posted / siva
Two type of core in ct,
1,protection core
2,metering core
protection core; only for protect the equipment used to
relay based.
metering core : this is only for showing the current in
ammeter .
In different type of class in CT 5p10,5p20 And ps it is
used for protection purpose only ,
5-accuracy class.
p- protection
10-10% error.
20-20% error.
protection class:it is calculated by the knee point voltage
test.
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