What is mean CT Saturation? How to calculate?
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Answer Posted / jai sherring
CT saturates if it is not correcly rated. its ratio has to
be matched to the maximum fault current that it has to
pass. normally the ratio of fault current to rated current
should be kept within 20.
it is very relevant that the fault current is calculated as
per the upstream network fault level. furthe the X/R ratio
of the connecting network needs to be known for calculating
the DC component and its time delay. if the time constant
is small, the saturation shall occur for the first few
cycles, and delaying the actuation will solve the initial
mis-read of current signal. but if the time constant is
large, say of the order of ten cycles, proper sampling
solutions have to be resorted to, that is the current must
be sampled before the onset of saturation.
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