How can i calculate knee point voltage of 800/5A Current
transformer?please explain me with suitable calculation?
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Answer Posted / mprajaneb
For design purposes we can calculate the required knee
point voltage of a CT as follows.
Vknee= (50/In) + (If/(800/5))*(Rct+0.081)
In = CT secondary current (5A)
If is the fault current expected to flow through the CT
Rct - Resistance of the CT secondary.
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