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Knee point voltage question. Please advise.

Thread starter Sergejs
Start date Jul 15, 2014

Status: Not open for further replies.

Jul 15, 2014

Sergejs

Electrical

I have a Class X CT with a ratio of 1200/600/1A and on the nameplate it says I.EX.V.K.P. 0.018 614. I assume Im<18ma and Vkp>614. Now the testing performed on this CT goes up to 280V reaching Im of 18 mA (and says Vkp>280). I am a bit confused with this as I need to match existing set of CT's with proposed ones for unit protection. Is it correct to specify Vkp>614 and Im<18mA?