Rogowski current sensor

• US 8,324,883 B2
• Filed: 06/18/2008
• Issued: 12/04/2012
• Est. Priority Date: 06/28/2007
• Status: Active Grant

• Current Assignee: LEM International SA (LEM Holding SA)
• Original Assignee: Liaisons Electroniques-Mecaniques LEM SA
• Inventors: Turpin, Pierre
• Primary Examiner(s): Nguyen, Tung X
• Application Number:
  US12/666,903
• Publication Number:
  US 20120126789A1
• Time in Patent Office: 1,630 Days
• Field of Search: 324/117.R, 324/117.H, 324/126, 324/127, 324/142, 32476201-7621, 32475001-7503, 257/48, 438 14- 18
• US Class Current: 324/117.R
• CPC Class Codes: G01R 15/181 using coils without a magnetic core, e.g. Rogowski coils
• CPC Class Codes: Y02P 20/141 Feedstock

Abstract

The invention relates to a Rogowski-loop current sensor comprising a winding (4) extending between two ends (14, 16) configured to be provided about a primary conductor in which flows a current to be measured by moving said ends away from or towards each other. The sensor further includes a closing mechanism (18) provided at the ends of the winding, and including a body (20) having a high magnetic permeability and extending between said ends when the loop is closed.

Claims

1. Rogowski loop current transducer comprising a coil extending between two ends, said coil configured to be able to be placed around a primary conductor in which a current to be measured flows by separating and bringing back together said two ends, the transducer further comprising a closing mechanism arranged at the ends of the coil when the coil, wherein the closing mechanism comprises a magnetic circuit extending between said ends when the loop is in a closed configuration, the magnetic circuit includes a body having a high magnetic permeability, at least one part of the body is permanently attached to at least one of said two ends of the coil, the other of the said two ends of the coil is pluqqable in a non-permanent manner into a corresponding cavity of the body.

2. Transducer according to claim 1, wherein the body includes at least one cavity or cavity portion in which at least one of said two ends of the coil is inserted.

3. Transducer according to claim 2, wherein the body includes at least one protuberance inserted in at least one of said two ends of the coil.

4. Transducer according to claim 1, wherein the body includes at least one protuberance inserted in at least one of said two ends of the coil.

5. Transducer according to claim 2, wherein the body comprises ferrite.

6. Transducer according to claim 2, wherein the body is formed of a single part.

7. Transducer according to claim 2, wherein the body comprises at least two separable parts.

8. Transducer according to claim 1, wherein the body comprises ferrite.

9. Transducer according to claim 1, wherein the body is formed of a single part.

10. Transducer according to claim 1, wherein the body comprises at least two separable parts.

11. Transducer according to claim 1, wherein the other of the said two ends of the coil is permanently attached to another part of the body.

12. Transducer according to claim 1, wherein the two ends of the coil overlap when the loop is in a closed configuration.

13. Transducer according to claim 1, wherein the two ends of the coil are aligned when the loop is in a closed configuration.

14. Transducer according to claim 1, wherein a connection cable is connected to one end of said two ends of the coil, the cable comprising magnetic shielding inserted into the magnetic circuit.

15. Transducer according to claim 1, wherein the connection cable comprises a thermoplastic sheath loaded with a ferromagnetic material.