Answer Posted / tuktuk

Dear Mr.Raghavendran,
Thank you for your answer, I have the same problem but after reading your answer I still have some concerns.
I am really confused. In this case, we do not know the rated burden of the VT. Now we have to calculate the total burden and then selecte the rated value from IEC standards.

__Ztotal, which you mentioned above, is in Ohm or VA?
__Zsec and Zrelay we can get the value from manufacturer but Zlead, is it calculated by this formula: Zlead= (p*L)/S
(where: p is specific resistivity of copper in ohm.mm^2/m; L is length of lead between the PT secondary and the relay in meter; S is the section of lead in sqmm)? Is this true?
__I dont know how can we get secondary current Isec? (I guess Isec=Usec/Zt, isn't it?)
__And Burden in VA = Zt*Isec. As Ohm law, we have P=VI=RI^2=U^2/R, I do not understand the formula that you used to calculate Burden of VT in VA
Hope that you could help me to solve this stuck in my head.

Thank you.

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