What is mean CT Saturation? How to calculate?
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Answer Posted / guest
CT saturation cannot be calculated, it is tested with some
instruments.CT saturation is to know at which point of
current the CT gets saturated and so the CT is no more
correct.If we are going to test A CT of ratio 100:5A than a
variable power supply through an ammeter in series and a
volt meter in parallel is connected to the secondary of the
CT.(the part the ammeter is usually connected). A graph has
to be plotted so all readings has to be recorded.First a low
voltage is fed to the CT through the variable power supply until the ammeter shows 1 amp.Say at 10 volts you got 1 amp,
it is recorded. likewise the voltage is increased till the amp meter reads 2 amps and than 3 amps.The readings are
taken till you will come to a point the ammeter reading and
the voltmeter reading is no more proportionate.
This readings are used to plot a graph with the vertical
axis for the voltage and the horizontal for the amps So you
will get a graph at 0 volt 0 amp and at 10 volts 1 amp and
so on
At one point say 10 amps you will find a small increase in
voltage will produce in a very high amp reading. This point
is known as the knee point or the saturation point.
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