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Ah ok i think i get it now, So to summarize, CT saturation is no good because it causes errors and the secondary current drops low. So make a mag curve to find where this saturation takes place. Measuring CT's you want it to saturate slightly above the rated current to ensure that the...

old field guy, Just to clarify your calculations, Eg. Burden = 1 A x 1.5 V = 1.5 VA Then multiply by fault current, lets say 10 times = 1.5 x 100 000 = 150 000 A ? Next is to find the terminal voltage which is? = ??? A billion thanks, sorry if this seems like a really really...

Guys thanks a lot for all the explanations here. Really appreciate it.

Oh yes, my bad. Sorry but i still don't understand the point of a secondary injection. OK it's to find the knee point where the CT saturates and starts to give errors but the thing is it is found using a voltage injection to the secondary side when during normal operation no voltage is...

I see, so that means if the fault current doesn't generate 2700V on the secondary side, the CT won't go into saturation, is that right?

Yes it's a CT used for generator protection. So to know if the CT is the right one i have to check with the protection relay manual But what about the first question of finding the primary current which will cause it to saturate?

I know when a CT goes into saturation it starts to produce errors and problems to produce sufficient secondary current. So we do a secondary injection to determine the knee point of the CT. Ok so now i have a graph showing the excitation voltage and the excitation current. My question is how to...