Patent ID: 7598724

Claim:
A current transformer (CT) assembly comprising: a first Rogowski coil comprising a first closeable loop having an electrically conductive coil member with a first pair of terminals; a second Rogowski coil comprising a second closeable loop having an electrically conductive coil member with a second pair of terminals; a third Rogowski coil comprising a third closeable loop having an electrically conductive coil member with a third pair of terminals; and an integrator assembly unit being separately connected to each of the first, second and third closeable loops, including a first connection to the first pair of terminals of the first loop, a second connection to the second pair of terminals of the second loop, and a third connection across the third pair of terminals of the third loop, wherein the integrator assembly unit receives a respective output voltage from at least one closeable loop and provides an output signal proportional to the respective electrical conductor arranged within an opening of the at least one closeable loop, and wherein each Rogowski coil includes one or more on-board selection switches for selecting a range of current values for monitoring from multiple available ranges of current values.