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CT kneepoint

CT kneepoint

CT kneepoint

(OP)
If a CT has name plate Kneepoint of 750Volts. Should the measured (actual) value be Higher or lower than this figure and what is the tolerance ie 5%,10% etc

Thanks in advane

RE: CT kneepoint

Measured should be higher.

Normally it's stated as Vkp >= 750V (for example).

There is no tolerance per se...higher is better.

RE: CT kneepoint

the rating on the side of the CT is the Minimum value that you should obtain. It also should correspond with the formula to calculate Vkp= S/(Ns*ALF)

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