CT kneepoint

[camo1978]

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

 

[scottf]

Measured should be higher.

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

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

 

[ukzn]

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)

" THINK BIG "