what is the CT of protection and CT of metering ? what is
class 5P10 & 5P20 and class PS ?
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Answer Posted / anil konkimalla
Protection CT doesnt need much accuracy and it should not
saturate in fault condition. PS class means protection
class CT. 5P10 means 5% is the maximum composite error
shown while 20 times fault current flows.Hence 5P10 is
superior comparing to 5P20
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