COMPENSATED ROGOWSKI COIL

• US 20170059622A1
• Filed: 06/10/2016
• Published: 03/02/2017
• Est. Priority Date: 09/02/2015
• Status: Active Grant

• Current Assignee: Veris Industries LLC (Schneider Electric SE)
• Original Assignee: Veris Industries LLC (Schneider Electric SE)
• Inventors: COOK, Martin
• Granted Patent: US 10,295,573 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01R 15/181 using coils without a magnetic core, e.g. Rogowski coils

Abstract

A coil that includes compensation.

Claims

1. A coil for sensing a changing current comprising:

(a) an elongate substantially non-conductive core material having a first end portion and a second end portion;

(b) an elongate conductive member encircling said substantially non-conductive core;

(c) a coupler that interconnects said first end portion and said second end portion;

(d) a sensing module that receives an input signal from said elongate conductive member and estimates a conductor signal within a conductor at least partially encircled within said elongate substantially non-conductive core material;

(e) said sensing module modifying said input signal based upon an estimation of at least one frequency component of said conductor signal.

2. The coil of claim 1 wherein said elongate substantially non-conductive core material is substantially round in cross section.

3. The coil of claim 2 wherein said elongate conductive element includes a conductive wire wrapped around said substantially non-conductive core.

4. The coil of claim 1 wherein said sensing module includes an amplification circuit for said input signal.

5. The coil of claim 4 wherein said sensing module includes an integration circuit for said input signal.

6. The coil of claim 1 wherein said sensing module said modifying said input signal using at least two different modifications for two different said frequency components of said conductor signal.

7. The coil of claim 1 wherein said modifying of said input signal is a modification based upon an amplitude response to said conductor signal.

8. The coil of claim 1 wherein said modifying of said input signal is a modification based upon a phase response to said conductor signal.

9. The coil of claim 1 wherein said modifying of said input signal is a modification based upon a temperature response to said conductor signal.

10. The coil of claim 1 wherein said modifying of said input signal is a modification based upon at least one of an amplitude response to said conductor signal, a phase response to said conductor signal, and a temperature response to said conductor signal, wherein different frequencies of said modified input signal are used to together with a voltage signal calculate power of said conductor signal.

11. The coil of claim 10 wherein said modified input signal is based upon said amplitude response.

12. The coil of claim 10 wherein said modified input signal is based upon said phase response.

13. The coil of claim 10 wherein said modified input signal is based upon said temperature response.

14. The coil of claim 10 wherein said power is used to determine a harmonic distortion value of said power of said conductor.

15. The coil of claim 1 wherein said at least one frequency component includes a first harmonic of generally 120 hertz.

16. The coil of claim 1 wherein said at least one frequency component includes a first harmonic of generally 180 hertz.

17. The coil of claim 1 wherein said at least one frequency component includes a first harmonic of generally 420 hertz.

18. The coil of claim 1 wherein said at least one frequency component includes a first harmonic of generally 780 hertz.

19. The coil of claim 1 wherein said at least one frequency component includes a first harmonic of generally 1860 hertz.

20. The coil of claim 1 wherein said modifying said input signal includes a non-linear amplification.