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how we calculate the knee point of a protection and metering
CT and what is the testing procedure.
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Answer Posted / nur.asidik
knee point voltage is only for protection, not for measurement, it is depend on your protection you need,for example, 87 need higher Vkp than 50/51, just follow your relay requirement. I mean your CT Vkp should higher than Relay required Vkp. refer to IEC, for class 5P or 10P, Vkp is as a function of ALF, Rct, VA, and secondary ratio of CT
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