Precision, temperature-compensated, shielded current measurement device
First Claim
1. An electric current measuring device of the type using a coil and comprising:
- a core including a plurality of cavities therein;
a conductive coil wound about the core to form a first winding in a first direction and a second winding constituting a return winding, anda Faraday shield extending around the core, outside of the coil, and comprises a first insulation layer and a non-ferromagnetic metal layer.
2 Assignments
0 Petitions
Accused Products
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. The resistive network may be balanced or unbalanced. The resistive network may be capable of signal attenuation of an output, capable of calibration of an output, or provide temperature compensation of an output.
-
Citations
31 Claims
-
1. An electric current measuring device of the type using a coil and comprising:
-
a core including a plurality of cavities therein; a conductive coil wound about the core to form a first winding in a first direction and a second winding constituting a return winding, and a Faraday shield extending around the core, outside of the coil, and comprises a first insulation layer and a non-ferromagnetic metal layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 21, 22, 23, 24, 25, 26)
-
-
16. An electric current measuring device of the type using a coil and comprising:
-
a core; a conductive coil wound about the core to form a first winding in a first direction and a second winding constituting a return winding; a Faraday shield extending around the core, outside of the coil; and
,a coil attenuation, calibration, and temperature compensation circuit using a resistive network electrically coupled to the first winding and the second winding of the coil. - View Dependent Claims (17, 18, 19, 20)
-
-
27. A core for a coil comprising:
-
a core made of a non-magnetic material configured in a geometric shape; a plurality of cavities extending from an outer surface of the core into the core, the cavities being concentric with the core, and a structural rib. - View Dependent Claims (28, 29, 30, 31)
-
Specification