I have one ct of ratio 3000-2000/1 Amp its knee point voltage mentioned on name plate is 500-333/30mA-50mA at Vk/2. in secondary box there is three terminal named 1S1, 1S2, 1S3 then on which terminal obtained the knee point voltage ie 1S1-1S2 OR 1S1-1S3 & also specify the knee point voltage for the ratio 3000 from name plate.

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sigal phase supply is 230 v ac two phase supply is 415 v ac why three phase supply is 415 v ac why not 690 v ac

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What are the types of excitation system?

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What is differential relay ? where it can be used?

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