Parana Electrotech Pvt. Ltd. Parana Electrotech Pvt. Ltd. ISO 9000-2000 Company

Summation Transformer

The main function of an interposing CT is to balance the currents supplied to the relay where there would otherwise be an imbalance due to the ratios of the main CTs. Interposing CTs are equipped with a wide range of taps that can be selected by the user to achieve the balance required.

Connection diagram:




The no. of primary winding may be 2,3, or more as per the connection diagram shown.

All the primary windings are independent. The total sum of current is referred in the secondary winding.

e.g. ’Ratio’ :-1+1//1 15VA class1 or
‘Ratio’:-5+5+5//5 15 VA class1

Accuracy class and burden can be offered as per customer’s requirement.