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what is the meaning of knee point in current transformer and
how to calculate?
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Answer Posted / sonu pal
That sinusoidal voltage of rated frequency applied to the secondary terminals of the CT, which when increase by 10 %, cause the exciting current to increase by 50%.
Knee point voltage, V= K.Is (Rct+Rb)
K= is a parameter to be specified by customer which depends on the system fault,
Is= secondry current
Rct= secondry winding resistance at 75 deg C
Rb= impedance of secondry circuit.
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