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how to calculate knee point voltage of current transformer?
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Answer Posted / srinivasan venkatesh.
to calculate the CT Vk .
eg
CT Acc. class - 5p20
sec. ct - rated = 1 A
Rct - 3 Ohms
Burden 15VA
Vk = 20((Rct+Burden))
= 20((3+15 )
= 360V
in the above VK ,Imag critieria is less than 5% of the CT
secondary current. ie - 500mA ( equal to or less than) .
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