MIXED CURRENT SENSOR AND METHOD FOR FITTING SAID SENSOR

• US 20130314083A1
• Filed: 05/06/2013
• Published: 11/28/2013
• Est. Priority Date: 05/21/2012
• 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 9,341,654 B2
• Time in Patent Office: Days
• US Class Current: 324/244
• CPC Class Codes: G01R 15/181 using coils without a magnetic core, e.g. Rogowski coils
• CPC Class Codes: G01R 15/207 Constructional details independent of the type of device used
• CPC Class Codes: G01R 19/00 Arrangements for measuring currents or voltages or for indicating presence or sign thereof G01R5/00 takes precedence; for measuring bioelectric currents or voltages A61B5/24
• CPC Class Codes: G01R 19/0092 measuring current only all subgroups of G01R19/00 take precedence
• CPC Class Codes: G01R 3/00 Apparatus or processes specially adapted for the manufacture or maintenance of measuring instruments , e.g. of probe tips
• CPC Class Codes: G01R 33/0047 Housings or packaging of magnetic sensors packaging of semiconductor devices H01L23/00; Holders
• CPC Class Codes: G01R 33/02 Measuring direction or magnitude of magnetic fields or magnetic flux G01R33/20 takes precedence
• CPC Class Codes: H01F 38/30 Constructions
• CPC Class Codes: Y10T 29/4913 Assembling to base an electrical component, e.g., capacitor, etc.

Abstract

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

• • a magnetic current sensor;
  • a current measuring device comprising a Rogowski coil arranged in such a way that a primary circuit of the magnetic sensor corresponds to the primary circuit of said current measuring device,
  • electronic means for performing acquisition and measurement of the electric current.

Said sensor comprises a linking cassette comprising

• • first fixing means arranged to position and secure said cassette by clip-fastening onto the measuring device;
  • second fixing means arranged to position and secure said cassette and the measuring device by clip-fastening onto the case.

Claims

1. A mixed current sensor comprising in a case:

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

a current measuring device comprising a Rogowski coil arranged in such a way that a primary circuit of the magnetic sensor corresponds to the primary circuit of said current measuring device,

electronic means for performing acquisition and measurement of the electric current, said means being supplied by the coil of the magnetic sensor;

a sensor comprising a linking cassette comprising

first fixing means arranged to position and secure said cassette by clip-fastening onto the measuring device;

second fixing means arranged to position and secure said cassette and the measuring device by clip-fastening onto the case;

electric pins respectively connected to the Rogowski coil and to the electronic acquisition means.

2. The mixed current sensor according to claim 1, wherein the Rogowski coil is composed of an insulating shell on which a metal wire is wound, said shell comprising clip-fastening means designed to collaborate with the first fixing 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 fixing means of the linking cassette form a system of mortise and tenon type.

4. The mixed current sensor according to claim 1, wherein the second fixing means comprise at least one centring and fixing pin to position and secure the linking cassette and the measuring device by clip-fastening on the case.

5. The mixed current sensor according to claim 1, wherein the case comprises a base comprising a first housing for the electronic acquisition and measuring means, one of the walls of said housing comprising an opening for passage of the linking cassette.

6. The mixed current sensor according to claim 5, wherein the case comprises a first cover designed to be fixed by soldering onto the outer edges of the walls of the first housing of the base.

7. The mixed current sensor according to claim 5, wherein the electronic means comprise a printed circuit board arranged so as to be positioned inside the walls of the housing, the printed circuit board comprising holes enabling the electric pins of the linking cassette to be engaged and to pass through.

8. The mixed current sensor according to claim 5, wherein the base comprises a second housing having walls inside which the magnetic current sensor and the current measuring device are positioned.

9. The mixed current sensor according to claim 8, wherein the case comprises a second cover designed to be fixed by soldering onto the outer edges of the walls of the second housing of the base.

10. The mixed current sensor according to claim 1, wherein the magnetic current sensor is connected to the electronic means for performing acquisition and management of the electric current by rigid electric tracks securedly attached to the base.

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

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

positioning of the assembly formed by the linking cassette and coiled shell in the housing of the base of the case, two centring pins of the linking cassette enabling positioning and securing of the linking cassette and of the measuring device by clip-fastening onto the case;

fixing of the magnetic current sensor in the base of the case;

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

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

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

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

positioning and soldering of a second cover on the outer edges of the walls of the second housing of the base.

12. The method for fitting according to claim 11, wherein the electric pins of the linking cassette and the electric pins of the electric tracks are soldered onto the electronic acquisition means by laser tin brazing.