Patent ID: 9369052
Filing Date: 2016-06-14
CPC Classification: G01R,H01F,H02M

Claim Text:
1. A direct-current current transformer (DCCT) comprising; first and second input terminals for connecting an input current to be measured to the DCCT, an output terminal for connecting an output signal representing the input current to external measurement or control apparatus, a drive signal generator for generating a commutation signal of a first phase, a commutation signal of a second phase, and a selector signal, a first commutated element for producing a current representing the input current comprising, a first burden connected in series circuit with the secondary winding of the first current transformer to develop a first signal representing to the input current, a second commutated element for producing a current representing the input current comprising, a second burden connected in series circuit with the secondary winding of the second current transformer to develop a second signal representing the input current, the first series circuit of the first commutated element being connected in series circuit with the second series circuit of the second commutated element and with the input terminals, and a selector switch responsive to the selector signal for connecting the output terminal, responsive to the selector signal, to either, the signal appearing at the output terminal represents the input current without transient disturbances.