Current sensor for measuring an electrical current in a circuit having a plurality of electrical conductors

• US 7,477,058 B2
• Filed: 05/10/2006
• Issued: 01/13/2009
• Est. Priority Date: 05/12/2005
• Status: Expired due to Fees

• Current Assignee: Nuvolt Corporation Inc.
• Original Assignee: Nuvolt Corporation Inc.
• Inventors: Montreuil, Michel
• Primary Examiner(s): Dole; Timothy J
• Assistant Examiner(s): NATALINI, JEFF WILLIAM
• Application Number:
  US11/430,958
• Publication Number:
  US 20060255793A1
• Time in Patent Office: 979 Days
• Field of Search: None
• US Class Current: 324/522
• CPC Class Codes: G01R 15/202 using Hall-effect devices Hall elements in arrangements for measuring electrical power G01R21/08
• CPC Class Codes: G01R 15/207 Constructional details independent of the type of device used
• CPC Class Codes: H01F 27/402 Association of measuring or protective means
• CPC Class Codes: H01F 3/10 Composite arrangements of magnetic circuits
• CPC Class Codes: H01F 3/14 Constrictions; Gaps, e.g. air-gaps in magnetic shunt paths H01F3/12
• CPC Class Codes: H01F 30/16 Toroidal transformers
• CPC Class Codes: H01F 38/30 Constructions
• CPC Class Codes: H01F 38/38 for polyphase ac

Abstract

The invention relates to a current sensor for monitoring electrical disturbances on an electrical circuit having an electrical conductor. The current sensor comprises a magnetic flux sensor for sensing a magnetic flux generated by a current flowing in the electrical conductor and for providing a signal representative of the current; and a processor for acquiring the signal from the magnetic flux sensor, for detecting an electrical disturbance on the current and for providing electrical disturbance data. The current sensor may also comprise a ring-shaped magnetic structure for receiving the electrical conductor and an opening within the ring-shaped magnetic structure for receiving the magnetic flux sensor. The magnetic flux sensor being for sensing a magnetic flux generated in the magnetic structure by the current in the electrical conductor.

Claims

1. A current sensor for measuring an electrical current on an electrical circuit having a plurality of electrical conductors, said current sensor comprising:

a plurality of ring-shaped magnetic structures each for receiving one of said electrical conductors whereby the magnetic structures can be positioned along said electrical conductors, and each having an opening therein receiving a magnetic flux sensor for evaluating a magnetic flux generated by a current flowing in said one of said electrical conductors and for providing a signal representative of said current;

a global ring-shaped magnetic structure surrounding said plurality of electrical conductors; and

a global magnetic flux sensor for evaluating a magnetic flux generated by currents flowing in said plurality of electrical conductors to measure a differential reading of current flowing in said plurality of electrical conductors.

2. The current sensor as claimed in claim 1, wherein the magnetic flux sensors are hall effect sensors.

3. The current sensor as claimed in claim 1, further comprising retaining means for retaining said magnetic structures and the magnetic flux sensors around said electrical conductors.

4. The current sensor as claimed in claim 1, further comprising voltage detectors each for detecting a voltage of a corresponding one of said electrical conductors.

5. The current sensor as claimed in claim 4, wherein said voltage detectors are shaped in a half moon each surrounding said corresponding one of said electrical conductors and said voltage detectors each comprises a conductive trace on a substrate for generating a voltage signal if voltage is present in said corresponding one of said electrical conductors, and wherein the voltage signals are received by said data acquisition module.

6. The current sensor as claimed in claim 1, further comprising a case through which said electrical conductors can be inserted for protecting said magnetic structures, said magnetic flux sensors and said data acquisition module.

7. The current sensor as claimed in claim 1, comprising an analog to digital converter for converting a reading received by said data acquisition module into digital sensor data.

8. The current sensor as claimed in claim 7, further comprising an emitter for transmitting said digital sensor data.

9. The current sensor as claimed in claim 1, wherein said global magnetic flux sensor is a hall effect sensor.

10. The current sensor as claimed in claim 1, further comprising retaining means for retaining said global magnetic structure and said global magnetic flux sensor around said plurality of magnetic structures.

11. The current sensor as claimed in claim 1, wherein said plurality of electrical conductors has four electrical conductors.

12. The current sensor as claimed in claim 11, wherein said electrical conductors are three line conductors and one neutral conductor.

13. The current sensor as claimed in claim 1, further comprising a data acquisition module for receiving a reading from said magnetic flux sensors.