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US 6,313,623 B1Granted
High precision rogowski coil
AssigneeMcGraw-Edison Company
InventorsLjubomir A. Kojovic, Veselin Skendzic, Stephen E. Williams
Life of this patent
Estimating the term…
Abstract
A Rogowski coil measures a current in a conductor and includes first and second loops electrically connected in series with each other. The first loop is wound with a substantially constant winding density in a first direction around a first core that has a substantially constant cross section. The second loop is wound with a substantially constant winding density in a second direction around a second core that has a substantially constant cross section. A direction of the first loop is substantially perpendicular to the normal of the first core cross section. Moreover, a direction of the second loop is substantially perpendicular to the normal of the second core cross section.
Claims29
A Rogowski coil that measures a current in a conductor, the Rogowski coil comprising:
- a first loop wound with a substantially constant winding density in a first direction around a first core that has a substantially constant cross section, and
- a second loop wound with a substantially constant winding density in a second direction around a second core that has a substantially constant cross section, the second loop connected in series with the first loop and decoupled from the first loop,
- wherein:
- a direction of the first loop is substantially perpendicular to the normal of the first core cross section, and
- a direction of the second loop is substantially perpendicular to the normal of the second core cross section.
2 more elements
A system to measure a current in a conductor, the system comprising:
- a first Rogowski coil comprising:
- a first loop wound with a substantially constant winding density in a first direction around a first core that has a substantially constant cross section, and
- a second loop wound with a substantially constant winding density in a second direction around a second core that has a substantially constant cross section, the second loop connected in series with the first loop and decoupled from the first loop, such that a direction of the first loop is substantially perpendicular to the normal of the first core cross section, a direction of the second loop is substantially perpendicular to the normal of the second core cross section;
- and
- a second Rogowski coil identical in design to the first Rogowski coil and connected in series to the first Rogowski coil.
2 more elements
A Rogowski coil that measures a current in a conductor, the Rogowski coil comprising:
- a first loop traced with a substantially constant winding density in a first direction around a printed circuit board;
- and
- a second loop traced with a substantially constant winding density in a second direction around the printed circuit board,
- wherein:
- the printed circuit board forms a rectangular core around which the first and second loops are wound, the rectangular core having a substantially constant cross section and including four straight sections coupled by four rounded sections,
- the second loop is connected in series with the first loop and coupled to the first loop,
- a direction of the first loop is substantially perpendicular to the normal of the core cross section, and
- a direction of the second loop is substantially perpendicular to the normal of the core cross section.
5 more elements
A Rogowski coil that measures a current in a conductor, the Rogowski coil comprising:
- a first loop traced with a substantially constant winding density in a first direction around a printed circuit board;
- and
- a second loop traced with a substantially constant winding density in a second direction around the printed circuit board,
- wherein:
- the printed circuit board forms an elliptical core around which the first and second loops are wound, the elliptical core having a substantially constant cross section and including two straight sections coupled by two rounded sections,
- the second loop is connected in series with the first loop and coupled to the first loop,
- a direction of the first loop is substantially perpendicular to the normal of the core cross section, and
- a direction of the second loop is substantially perpendicular to the normal of the core cross section.
5 more elements
A Rogowski coil that measures a current in a conductor, the Rogowski coil comprising:
- a first loop traced with a substantially constant winding density in a first direction around a printed circuit board;
- and
- a second loop traced with a substantially constant winding density in a second direction around the printed circuit board,
- wherein:
- the printed circuit board forms a triangular core around which the first and second loops are wound, the triangular core having a substantially constant cross section and including three straight sections coupled by three rounded sections,
- the second loop is connected in series with the first loop and coupled to the first loop,
- a direction of the first loop is substantially perpendicular to the normal of the core cross section, and
- a direction of the second loop is substantially perpendicular to the normal of the core cross section.
5 more elements
A Rogowski coil that measures a current in a conductor, the Rogowski coil comprising:
- a first loop traced with a substantially constant winding density in a first direction around a printed circuit board;
- and
- a second loop traced with a substantially constant winding density in a second direction around the printed circuit board,
- wherein:
- the printed circuit board forms a core around which the first and second loops are wound, the core having a substantially constant cross section and including two or more straight sections coupled by two or more coupling sections,
- the second loop is connected in series with the first loop and coupled to the first loop,
- a direction of the first loop is substantially perpendicular to the normal of the core cross section, and
- a direction of the second loop is substantially perpendicular to the normal of the core cross section.
5 more elements
A system comprising:
- a first Rogowski coil comprising:
- a first loop traced with a substantially constant winding density in a general direction around a first printed circuit board, and
- a second loop traced with a substantially constant winding density in a general direction around a second printed circuit board, the second loop connected in series with the first loop and being decoupled from the first loop, and the general direction of the second loop being opposite to the general direction of the first loop;
- and
- a second Rogowski coil comprising:
- a third loop traced with a substantially constant winding density in a direction around the first printed circuit board, and
- a fourth loop traced with a substantially constant winding density in a direction around the second printed circuit board, the fourth loop connected in series with the third loop and being decoupled from the third loop, and the general direction of the fourth loop being opposite to the general direction of the third loop;
- each Rogowski coil measures a current through an electrical conductor on a phase of a multi-phase circuit when the electrical conductor is placed within the Rogowski coil.
5 more elements
A system comprising:
- a first Rogowski coil comprising:
- a first loop traced with a substantially constant winding density in a general direction around a printed circuit board, and
- a second loop traced with a substantially constant winding density in a general direction around the printed circuit board, the second loop electrically connected in series with the first loop and being coupled with the first loop, and the general direction of the second loop being opposite to the general direction of the first loop;
- and
- a second Rogowski coil comprising:
- a third loop traced with a substantially constant winding density in a direction around the printed circuit board, the third loop decoupled from the first and second loops, and
- a fourth loop traced with a substantially constant winding density in a general direction around the printed circuit board, the fourth loop electrically connected in series with the third loop, being coupled with the third loop and decoupled from the first and second loops, and the general direction of the fourth loop being opposite to the general direction of the third loop;
- each Rogowski coil measures a current through an electrical conductor on a phase of a multi-phase circuit when the electrical conductor is placed within the Rogowski coil.
5 more elements
Dependencies are inferred from the claim text.