MIXED CURRENT SENSOR AND METHOD FOR FITTING SAID SENSOR

• US 20140132249A1
• Filed: 10/04/2013
• Published: 05/15/2014
• Est. Priority Date: 11/15/2012
• Status: Active Grant

• Current Assignee: Schneider Electric Industries SAS (Schneider Electric SE)
• Original Assignee: Schneider Electric Industries SAS (Schneider Electric SE)
• Inventors: LOGLISCI, David
• Granted Patent: US 9,423,428 B2
• Time in Patent Office: Days
• US Class Current: 324/144
• CPC Class Codes: G01R 15/181 using coils without a magnetic core, e.g. Rogowski coils
• CPC Class Codes: G01R 15/183 using transformers with a magnetic core
• CPC Class Codes: G01R 19/0092 measuring current only all subgroups of G01R19/00 take precedence
• CPC Class Codes: H01F 27/02 Casings
• CPC Class Codes: H01F 27/2823 Wires H01F27/2866 takes precedence
• CPC Class Codes: H01F 27/29 Terminals; Tapping arrangements for signal inductances
• CPC Class Codes: H01F 27/306 Fastening or mounting coils or windings on core, casing or other support
• CPC Class Codes: H01F 38/30 Constructions

Abstract

The invention relates to a mixed current sensor comprising in a case:

• • a current measurement device comprising a first coil;
  • a magnetic current sensor having a second coil,
  • electronic measurement means.

Said sensor comprises:

• • a first cassette comprising first linking means arranged to fix said cassette to the first coil by clip-fastening and second linking means arranged to secure the measurement device on the case;
  • a second cassette comprising third linking means arranged to secure and fix both the magnetic sensor on the case and the first cassette and the measurement device by clip-fastening on said case.

Claims

1. A mixed current sensor comprising in a case:

a current measurement device comprising a first coil of Rogowski type;

a magnetic current sensor having a second coil wound around a magnetic circuit,

the current measurement device and the magnetic current sensor being arranged in such a way as to have the same primary circuit;

electronic acquisition and measurement means of the electric current,

a sensor comprising

a first linking cassette comprising

first linking means arranged to position and fix said cassette to the first coil by clip-fastening;

second linking means arranged to position and secure said cassette and the measurement device on the case;

a second linking cassette comprising

third linking means arranged to position, secure and fix by clip-fastening;

the magnetic sensor on the case;

the first cassette and the measurement device on the case;

the first and second cassettes comprising electric pins respectively connecting the first and second coils to the electronic acquisition means.

2. The mixed current sensor according to claim 1, wherein the first coil of the current measurement device is wound on an insulating shell comprising clip-fastening means designed to collaborate with the first linking means of the linking cassette.

3. The mixed current sensor according to claim 2, wherein the clip-fastening means of the shell and the first linking means of the linking cassette form a tenon and mortar system.

4. The mixed current sensor according to claim 1, wherein the second linking means of the first linking cassette comprise a positioning slide salient with respect to the body of said linking cassette, said positioning slide being designed to be housed in a groove of a housing of the case to form a tenon and mortar system.

5. The mixed current sensor according to claim 1, wherein the assembly formed by the second coil and the magnetic circuit is fixed onto an insulating support plate, the second linking cassette being secured to the insulating support plate.

6. The mixed current sensor according to claim 5, wherein the third linking means of the second linking cassette comprise a positioning slide salient with respect to the body of the second linking cassette, said positioning slide being designed to be housed in the same groove as the positioning slide of the first linking cassette to form a tenon and mortar system.

7. The mixed current sensor according to claim 6, wherein the grooves of the housing comprise stop means designed to collaborate with slides of the second cassette at the end of translational movement of said slides in the housing, said stop means being designed to block translational movement of both the first and second cassette.

8. The mixed current sensor according to claim 1, wherein the magnetic current sensor comprises a second coil wound around the magnetic circuit, the assembly formed by the second coil and the magnetic circuit being fixed onto the insulating support plate.

9. The mixed current sensor according to claim 1, wherein the electronic acquisition and measurement means are positioned in a first housing of a base of the case, one of the walls of said housing comprising an opening for passage of the linking cassettes.

10. The mixed current sensor according to claim 9, wherein the case comprises a first flat cover designed to be fixed by welding onto an outer edge of the walls of the first housing of the base.

11. The mixed current sensor according to claim 9, wherein the electronic means comprise a printed circuit plate arranged to be positioned inside the walls of the housing, the plate of the printed circuit comprising holes allowing passage and engagement of the electric pins of the first and second linking cassettes.

12. The mixed current sensor according to claim 9, wherein the base comprises a second housing having walls inside which the magnetic current sensor and the current measurement device are positioned, the outer edge of the walls extending according to a plane.

13. The mixed current sensor according to claim 12, wherein the case comprises a second flat cover designed to be fixed by welding onto the outer edge of the walls of the second housing of the base.

14. The mixed current sensor according to claim 1, wherein the electronic acquisition and measurement means of the electric current are supplied by the second coil of the magnetic current sensor.

15. A method for fitting a mixed current sensor according to claim 1 comprising the following steps:

fixing of the first cassette on the insulating shell of the current measurement device, the wires of the first coil being electrically connected to the electric pins of the cassette;

positioning of the assembly formed by the first cassette and the shell supporting the first coil in the case, the first cassette enabling positioning of the measurement device in the case;

positioning of the assembly formed by the second cassette and the second coil in the case, the second cassette enabling positioning and fixing;

of the measurement device on the case;

of the magnetic current sensor;

electric welding of the tracks onto the coil of the magnetic sensor;

positioning of the printed circuit plate of the electronic acquisition means inside the walls of the first housing;

welding of the electric pins of the first cassette and of the electric pins of the tracks onto the electronic acquisition means;

positioning and welding of a first cover on the outer edges of the walls of the first housing;

positioning and welding of a second cover on the outer edge of the walls of the second housing of the base.