Electrical-energy meter

• US 7,274,187 B2
• Filed: 11/02/2005
• Issued: 09/25/2007
• Est. Priority Date: 06/27/2002
• Status: Expired due to Term

• Current Assignee: Elster Electricity LLC (Honeywell International Inc.)
• Original Assignee: Elster Electricity LLC (Honeywell International Inc.)
• Inventors: Loy, Garry M.
• Primary Examiner(s): Nguyen; Ha Tran
• Assistant Examiner(s): Nguyen; Trung Q.
• Application Number:
  US11/265,472
• Publication Number:
  US 20060043961A1
• Time in Patent Office: 692 Days
• Field of Search: None
• US Class Current: 324/142
• CPC Class Codes: G01R 22/00 Arrangements for measuring time integral of electric power or current, e.g. electricity meters
• CPC Class Codes: G01R 22/065 related to mechanical aspects

Abstract

A presently-preferred embodiment of an electrical-energy meter comprises a base adapted to be mounted on a supporting surface, a current sensor assembly comprising a plurality of contact blades extending through the base and adapted to electrically contact a conductor of electrical energy, and a current transformer mechanically coupled to the base and electrically coupled to the contact blades. The electrical-energy meter further comprises a circuit board assembly comprising a main circuit board electrically coupled to the current transformer and the contact blades. The electrical-energy meter also comprises a circuit-board support member comprising a rim portion fixedly coupled to the base, and a first bracket adjoining the rim portion. The first bracket has a first and a second leg each extending away from the rim portion and the base and each being adapted to securely engage the main circuit board.

Claims

1. An electrical-energy meter, comprising:

a current sensor for generating an electrical output proportional to a current in an electrical conductor magnetically coupled to the current sensor;

a tab mounted on the current sensor; and

a support structure having a receptacle formed therein, the receptacle being configured to receive the tab to mount the current sensor on the support structure, the support structure further comprising a support configured to engage an inner circumferential surface of the current sensor to mount the current sensor on the support structure, wherein the current sensor can be mounted on the support structure using the receptacle and the tab and, alternatively, the support.

2. The electrical-energy meter of claim 1, wherein the inner circumferential surface of the current sensor includes a crush rib that deforms when the current sensor is mounted on the support to secure the current sensor to the support.

3. The electrical-energy meter of claim 1, wherein the support is tongue-shaped.

4. The electrical-energy meter of claim 1, further comprising a second current sensor coupled to a second electrical conductor, and a second tab mounted on the second current sensor, wherein the support structure has a second receptacle formed therein, the second receptacle being configured to receive the second tab to mount the second current sensor on the support structure.

5. The electrical-energy meter of claim 1, further comprising a first lead for magnetically connecting the current sensor to the electrical conductor, and a second lead for magnetically connecting the current sensor to a second electrical conductor, wherein the support is located between portions of the first and second leads when the current sensor is mounted on the support, and the support is formed from an electrically insulative material whereby the support forms a voltage barrier between the first and second leads.

6. The electrical-energy meter of claim 5, wherein the first and second leads are bus bars.

7. The electrical-energy meter of claim 1, further comprising:

a second tab mounted on the current sensor;

a circuit board assembly comprising a circuit board electrically connected to the current sensor and the electrical conductor, the circuit board assembly calculating and displaying a cumulative amount of electrical energy passing through the electrical conductor based on the electrical output of the current sensor and a voltage of the electrical conductor; and

a circuit-board support secured to the support structure and having a groove formed therein for receiving the second tab to secure the current sensor between the circuit-board support and the support structure.

8. The electrical-energy meter of claim 1, wherein the current sensor is a current transformer.

9. The electrical-energy meter of claim 1, further comprising the electrical conductor, wherein the electrical conductor comprises a contact blade.

10. The electrical-energy meter of claim 9, wherein the electrical conductor further comprises a bus bar electrically connected to the contact blade.

11. The electrical-energy meter of claim 10, wherein the contact blade and the bus bar are unitarily formed.

12. An electrical-energy meter, comprising:

a current sensor assembly comprising an electrical conductor and a current sensor magnetically coupled to the electrical conductor, the current sensor producing an electrical output proportional to a current through the electrical conductor;

a circuit board assembly comprising a circuit board electrically connected to the current sensor and the electrical conductor, the circuit board assembly calculating and displaying a cumulative amount of electrical energy passing through the electrical conductor based on the electrical output of the current sensor and a voltage of the electrical conductor; and

a spring that electrically and mechanically connects the electrical conductor and the circuit board.

13. The electrical-energy meter of claim 12, wherein the electrical conductor comprises a contact blade, and the spring engages the contact blade.

14. The electrical-energy meter of claim 13, wherein the electrical conductor further comprises a bus bar electrically connected to the contact blade.

15. The electrical-energy meter of claim 14, wherein the contact blade and the bus bar are unitarily formed.

16. The electrical-energy meter of claim 13, wherein an end portion of the spring is bent so that the end portion resiliently engages opposite sides of the contact blade whereby the spring maintains mechanical contact with the contact blade without the use of fasteners.

17. The electrical-energy meter of claim 12, wherein the current sensor assembly further comprises a second electrical conductor electrically connected to the current sensor;

the electrical energy meter further comprises a second spring that electrically and mechanically connects the second electrical conductor and the circuit board; and

the springs engage the circuit board.

18. The electrical-energy meter of claim 17, wherein the springs engage opposite sides of the circuit board.

19. The electrical-energy meter of claim 12, wherein the current sensor is a current transformer.

20. An electrical-energy meter, comprising:

a current sensor for generating an electrical output proportional to a current in an electrical conductor electrically connected to the current sensor; and

a circuit board assembly comprising;

a circuit board electrically connected to the current sensor, the circuit board calculating a cumulative amount of electrical energy passing through the electrical conductor based on the electrical output of the current sensor and a voltage of the electrical conductor; and

a display that displays the cumulative amount of energy passing through the conductor of electrical energy, the display having a plurality of electrically-conductive pins that extend from only one side of the display and electrically contact the circuit board.

21. The electrical-energy meter of claim 20, wherein the display is a substantially flat liquid crystal display.

22. The electrical-energy meter of claim 20, wherein the display is mounted in an orientation substantially perpendicular to the circuit board.

23. The electrical-energy meter of claim 22, wherein the circuit board assembly further comprises a bracket mounted on the circuit board and the display is mounted on the bracket.

24. The electrical-energy meter of claim 23, wherein the bracket is formed from a thermoplastic material and comprises:

a first and a second support arm;

a first and a second support foot adjoining the respective first and second support arms;

a transverse member adjoining the first and second support arms;

a molded spring formed on the transverse member;

a first and a second mounting arm adjoining the respective first and second support arms and extending substantially perpendicular to the first and second support arms;

a first and a second forward mount adjoining the respective first and second mounting arms, the first and second forward mounts each having a groove formed therein, the first and second forward mounts securely engaging an edge of the circuit board by way of the grooves; and

a first and a second rearward mount adjoining the respective first and second mounting arms, the first and second rearward mounts each having a notch formed therein and being adapted to be inserted through respective slots formed in the circuit board so that the first and second rearward mounts securely engage the circuit board by way of the notches, and the first and second support arms, the first and second support feet, the transverse member, and the spring securely engage the display and thereby secure the display in position in relation to the circuit board.

25. The electrical-energy meter of claim 20, wherein the current sensor is a current transformer.

26. The electrical-energy meter of claim 20, further comprising the electrical conductor, wherein the electrical conductor comprises a contact blade.

27. The electrical-energy meter of claim 26, wherein the electrical conductor further comprises a bus bar electrically connected to the contact blade.

28. The electrical-energy meter of claim 27, wherein the contact blade and the bus bar are unitarily formed.

29. An electrical-energy meter, comprising:

a support structure;

a current sensor assembly comprising a contact blade extending through the support structure for electrically contacting a conductor of electrical energy, and a current sensor mounted on the support structure and magnetically coupled to the contact blade, the current sensor producing an electrical output proportional to a current in the electrical conductor; and

a disconnect switch electrically and mechanically connected to the contact blade so that the contact blade secures the disconnect switch to the support structure.

30. The electrical-energy meter of claim 29, further comprising:

a circuit board electrically connected to the current sensor and the contact blade, the circuit board calculating a cumulative amount of electrical energy passing through the conductor of electrical energy based on the electrical output of the current sensor and a voltage of the electrical conductor; and

a circuit-board support comprising a rim portion secured to the support structure, and a key adjoining the rim portion and securely receiving the contact blades whereby the disconnect switch can be secured to the support structure without the use of fasteners.

31. The electrical-energy meter of claim 30, further comprising a first bracket adjoining the rim portion, the first bracket having a first and a second leg each extending away from the rim portion, the first and second legs each securely engaging the circuit board.

32. The electrical-energy meter of claim 29, wherein the disconnect switch interrupts a flow of the electrical energy through the conductor of electrical energy in response to radio communications from a source external to the electrical-energy meter.

33. The electrical-energy meter of claim 29, wherein the current sensor is a current transformer.

34. The electrical-energy meter of claim 33, wherein the contact blade and the bus bar are unitarily formed.

35. The electrical-energy meter of claim 29, further comprising a bus bar electrically connected to the blade.

36. An electrical-energy meter, comprising:

an electrical conductor comprising a contact blade and a bus bar electrically connected to the contact blade;

a current sensor magnetically coupled to the contact blade for generating an electrical output proportional to a current in the electrical conductor;

a tab mounted on the current sensor; and

a support structure having a receptacle formed therein, the receptacle being configured to receive the tab to mount the current sensor on the support structure.

37. An electrical-energy meter, comprising:

a current sensor for generating an electrical output proportional to a current in an electrical conductor magnetically coupled to the current sensor;

a first and a second tab mounted on the current sensor;

a support structure having a receptacle formed therein, the receptacle being configured to receive the first tab to mount the current sensor on the support structure;

a circuit board assembly comprising a circuit board electrically connected to the current sensor and the electrical conductor, the circuit board assembly calculating and displaying a cumulative amount of electrical energy passing through the electrical conductor based on the electrical output of the current sensor and a voltage of the electrical conductor; and

a circuit-board support secured to the support structure and having a groove formed therein for receiving the second tab to secure the current sensor between the circuit-board support and the support structure.