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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