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Answer Posted / singa
CTs are having both measuring as well as protection cores.
Measuring cores:
In a HT lne, current value is in terms of few hundrest to
kilo amps. In practical these cannot be measured by meters
direclty. Hence the current in the transmission line will
be stepped down to the standard values for example 2000/1A.
THis refers to the flow of 1A at CT secondary when 2000A
flows in HT line.
Protection core: As the fault current is very high during
the time of fault, this increase in current is used to trip
the faulty section. In order to sense the fault current,
protection cores of CTs are used to feed the protection
relay.
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