Abstract: A current measurement device using a Rogowski coil having a generally toroidally shaped core with flattened faces, a first winding in one direction, a second winding forming a return loop, and a temperature compensation and scaling network coupled to the coil. The core has concentric cavities and a rough surface to restrain movement of the coil winding. A Faraday shield is wrapped over the coil. One shield is “serpentine,” having staggered (offset) lateral extensions from a central region. An alternate shield has a generally circular central region with extensions in generally radial directions. The shield is formed of three layers comprising a non-ferromagnetic metal central layer surrounded by insulative layers. At an end tab of the shield, the metal layer is exposed for connection to a ground lug or other connector. An insulative housing envelops the coil and electrical network. An output wire terminates in an industrial connector. A resistive network may be implemented with the current measurement device.

Abstract: A current measurement device using a Rogowski coil having a generally toroidal-shaped core with a first winding in one direction and a second winding forming a return loop. The coil is positioned within a two-piece electrostatic shield. A first piece of the electrostatic shield is a partially donut-shaped member having a U-shaped cross-section. The coil is positioned in the donut-shaped member and covered by an encapsulating material. The first piece includes a slit through the cross-section thereof to prevent an electrical loop around the perimeter thereof. The second piece of the electrostatic shield is flat and has a donut-shaped configuration. The second piece is configured with inside and outside peripheral edges such that only one or none of the inside/outside edges contact the first piece. The second piece also has a cross-sectional slit which is in registry with the slit in the first piece.