Current Sensor For Power Measurement Applications

• US 20140167786A1
• Filed: 12/14/2012
• Published: 06/19/2014
• Est. Priority Date: 12/14/2012
• Status: Abandoned Application

• Current Assignee: Schneider Electric USA, Inc. (Schneider Electric SE)
• Original Assignee: Schneider Electric USA, Inc. (Schneider Electric SE)
• Inventors: Gutierrez, Efrain, Diaz, Mauricio, Sanchez, Gustavo Garza
• Application Number:
  US13/715,492
• Publication Number:
  US 20140167786A1
• Time in Patent Office: Days
• US Class Current: 324/654
• CPC Class Codes: G01R 15/181 using coils without a magnetic core, e.g. Rogowski coils

Abstract

An electrical system with a power distribution system has a current sensor for directly monitoring electrical power in a current conductor, the current sensor including a printed circuit board (PCB), a current transducer, and integrated conditioning electronics. The PCB has a non-ferromagnetic core through which the current conductor is inserted. The current transducer is for sensing the electrical power in the current conductor and is in the form of a sensing coil printed around the non-ferromagnetic core. The conditioning electronics are embedded into the PCB for processing a data signal based on the monitored electrical power of the current conductor.

Claims

1. An electrical system comprising:

a power distribution system having a current conductor; and

a current sensor for directly monitoring electrical power in the current conductor, the current sensor including

(a) a printed circuit board (PCB) with a non-ferromagnetic core through which the current conductor is inserted,

(b) a current transducer for sensing the electrical power in the current conductor, the current transducer being in the form of a sensing coil printed around the non-ferromagnetic core, and

(c) conditioning electronics embedded into the PCB for processing a data signal based on the monitored electrical power of the current conductor.

2. The electrical system of claim 1, further comprising a distribution enclosure for the power distribution system, the distribution enclosure housing the current conductor and the current sensor.

3. The electrical system of claim 2, wherein the distribution enclosure includes a value display exteriorly mounted to display in real time measured values of the monitored electrical power.

4. The electrical system of claim 3, wherein the measured values include at least one of a current value and a voltage value.

5. The electrical system of claim 1, wherein the current sensor has an electrical output range of about one ampere to about five amperes.

6. The electrical system of claim 1, wherein the conditioning electronics include an integrator and a voltage-to-current converter.

7. The electrical system of claim 1, wherein the sensing coil is a Rogowski coil.

8. The electrical system of claim 1, wherein the current sensor has a multi-phase arrangement in which at least one additional current transducer monitors an additional current conductor, the PCB having at least one additional non-ferromagnetic core around which an additional sensing coil is printed, the current sensor including additional conditioning electronics for the additional current transducer to process a data signal associated with the additional current conductor which is inserted through the additional non-ferromagnetic core.

9. The electrical system of claim 1, wherein the PCB is split into at least two board sections to accommodate insertion of the current conductor within the non-ferromagnetic core.

10. The electrical system of claim 1, wherein the non-ferromagnetic core has a shape selected from a group consisting of a circular shape, an oval shape, and a rectangular shape.

11. An electrical power distribution system comprising:

an enclosure having an exterior value display, the value display displaying measured electrical values;

a current conductor enclosed within the enclosure;

a current sensor for directly monitoring electrical power in the current conductor, the current sensor being enclosed within the enclosure and including

(a) a coreless printed circuit board (PCB) through which the current conductor is inserted,

(b) a current transducer for sensing the electrical power in the current conductor, the current transducer being a sensing coil printed around an internal aperture of the PCB, and

(c) electronics embedded in the PCB for receiving an input power signal from the current transducer and outputting, in real time, the measured electrical values to the value display.

12. The electrical power distribution system of claim 11, wherein the measured electrical values include at least one of a current value and a voltage value.

13. The electrical power distribution system of claim 11, wherein the current sensor has an electrical output range of about one ampere to about five amperes.

14. The electrical power distribution system of claim 11, wherein the conditioning electronics include an integrator and a voltage-to-current converter.

15. The electrical power distribution system of claim 11, wherein the sensing coil is a Rogowski coil.

16. The electrical power distribution system of claim 11, wherein the current sensor has a multi-phase arrangement in which at least one additional current transducer monitors an additional current conductor, the PCB having at least one additional internal aperture around which an additional sensing coil is printed, the current sensor including additional embedded electronics for monitoring electrical power in the additional current conductor.

17. The electrical power distribution system of claim 11, wherein the PCB is split into at least two board sections to accommodate insertion of the current conductor within the internal aperture of the PCB.

18. The electrical power distribution system of claim 11, wherein the internal aperture of the PCB has a shape selected from a group consisting of a circular shape, an oval shape, and a rectangular shape.

19. The electrical power distribution system of claim 11, wherein the current conductor is selected from a group consisting of a cable, a flat lamination, and a flat extrusion.

20. The electrical power distribution system of claim 11, wherein the current sensor has an electrical output range of about one thousand amperes or more.