Answer Posted / raghavendran

Burden CAn be denoted in VA or in Ohms.Consider that to a PT
secondary we have a relay connected to it.Now the Total
impedance on the PT secondary is given by Zt = Zsec + Zlead
+ Zrelay.where the Zsec is the impedance of the PT
Secondary,Zlead be the impedance of the lead between the PT
secondary and the Relay,Zrelay be the Impedance of the relay.

Now from the VA capacity of the PT,under normal operating
condition of the PT,calculate the secondary current, Isec.

burden interms of VA can be obtained as Zt*Isec.
Burden interms of Ohms can be had from - Rated
VA/((Isec)*(Isec))

As Burden increases beyond the prescribed value, the
accuracy decreases below the allowable value.

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