Compensated rogowski coil

Patent metadata

Field	Value
Publication number	US-2017059622-A1
Application number	US-201615178953-A
Country	US
Kind code	A1
Filing date	Jun 10, 2016
Priority date	Sep 2, 2015
Publication date	Mar 2, 2017
Grant date	—

Abstract

A coil that includes compensation.

First claim

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.

Assignees

• Veris Industries Llc

Inventors

• Cook Martin

Classifications

• G01R15/181 Primary

  using coils without a magnetic core, e.g. Rogowski coils · CPC title