Answer Posted / arup

Knee point voltage, Vkn = (VA X ALF)/ In

VA= Burden =30 (Say)
ALF= Accu. Limit. Factor = 20 (Say)
In= Rated Secondar Current =5 amp (Say)
Then Vkn= 120 volts

If CT Ratio is 2000:5 then In=5
Class is 5P20 then ALF=20, P=Protection CT

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