Patent ID: 7800377
Filing Date: 2010-09-21
Classification: G01R

Abstract:
1. An apparatus for current transformer adaptation for extending the distance between a current sensing location, proximate to a load conductor carrying a load current between an alternating current source and a load, and a current measuring location having a current measuring instrument for deriving a measured reference current value for a current flowing through a reference resistive load, the apparatus comprising: a first current transformer having: a second current transformer having: an instrument conductor connected to, and forming a closed circuit between, the second secondary winding and the reference resistive load, and having a conductor resistive load that is the product of a length of the instrument conductor and a pre-determined resistive load per unit length; wherein the instrument conductor can be of any length less than or equal to a maximum instrument conductor length where the sum of the conductor resistive load and the reference resistive load is equal to the second load burden rating, and wherein a measured value for the load current can be derived from the measured reference current value, the second current ratio and the first current ratio.