Arc fault detector with diagnostic indicator

• US 6,654,219 B1
• Filed: 12/11/2001
• Issued: 11/25/2003
• Est. Priority Date: 12/11/2000
• Status: Expired due to Term

• Current Assignee: Pass & Seymour Incorporated (Legrand SA)
• Original Assignee: Pass & Seymour Incorporated (Legrand SA)
• Inventors: Richards, Jeffrey C., Romano, James P.
• Primary Examiner(s): Tso, Edward H.
• Application Number:
  US10/016,422
• Time in Patent Office: 714 Days
• Field of Search: 361/18, 361/42, 361/58, 361/62, 361/78, 361/79, 361/93.1, 361/115, 324/533, 324/528, 324/500, 324/509, 324/522, 324/527, 324/512
• US Class Current: 361/78
• CPC Class Codes: H02H 1/00 Details of emergency protective circuit arrangements
• CPC Class Codes: H02H 1/0015 Using arc detectors

Abstract

A protection device for an electrical circuit having a load includes a sensor operatively associated with the electrical circuit to sense current changes and voltage fluctuations in the electrical circuit. A detector receives input from the sensor and compares the input to known arc fault signatures and arc fault mimicking signatures to determine what category of arc fault or mimicked arc fault occurs. The detector then produces an encoded output signal indicative of the category of arc fault or mimicked arc fault. Categories of arc faults include upstream or downstream series, downstream parallel, downstream line to line, and downstream line to ground.

Claims

1. A device for detecting an electrical fault in a power line having electrical faults, comprising:

detection means for detecting a category and location of an occurring fault; and

output means for outputting a unique code associated with each different fault category and location detected.

2. A device as in claim 1, wherein said output code drives one or more indicators.

3. A device as in claim 1, wherein said detection means detects a ground fault current.

4. A device as in claim 1, wherein said detection means includes a current sensor and a voltage sensor.

5. A device as in claim 4, wherein said detection means detects sputtering currents indicative of arc faults.

6. A device as in claim 4, wherein said detection means detects voltage fluctuations indicative of arc faults.

7. A device as in claim 4, further comprising means for determining a relationship between said sputtering currents and said voltage fluctuations, wherein said relationship causes a unique blinking pattern in an indicator.

8. A device as in claim 7, further comprising a test button, wherein pressing said test button causes a characteristic blinking pattern in said indicator.

9. A device as in claim 7, wherein said blinking pattern distinguishes between upstream series arc faults, downstream series arc faults, and parallel arc faults.

10. A device as in claim 7, further comprising a reset button which resets said indicator.

11. A device as in claim 1, wherein said output means includes interrupting means for interrupting said power line to eliminate said electrical fault.

12. A device according to claim 1, further comprising diagnostic means for reading each unique code outputted by said output means.

13. A device according to claim 12, wherein said diagnostic means includes one of a blinking light, a portable tester, a monitoring device, and a computer.

14. A protection device for an electrical circuit having a load, comprising:

a sensor operatively associated with said electrical circuit which senses current changes and voltage fluctuations in said electrical circuit; and

a detector which receives input from said sensor and compares said input to known arc fault signatures to determine what category of arc fault occurs;

wherein said detector produces an encoded output signal indicative of said category of arc fault.

15. A device according to claim 14, further comprising an interrupting mechanism operatively associated with said detector, wherein said detector sends a signal to said interrupting mechanism upon detection of one of said arc fault signatures, thereby causing said interrupting mechanism to disconnect said load from said electrical circuit.

16. A device according to claim 15, further comprising a reset button operatively associated with said interrupting contacts, such that activating said reset button enables closure of said interrupting contacts, and wherein said encoded output signal commences upon detection of one of said arc fault signatures and terminates upon closure of said interrupting contacts.

17. A device according to claim 14, further comprising a test button for a test that enables a simulated arc fault signature, whereby a unique encoded output signal is produced by said detector in response to said simulated arc fault signature upon satisfactory completion of said test.

18. A device according to claim 14, wherein said sensor senses a variety of arc fault mimicking signatures, wherein said detector detects said variety of arc-fault mimicking signatures, and wherein said encoded output signal is indicative of which category of arc fault-mimicking signature is present.

19. A device according to claim 18, wherein said encoded output signal indicates if said arc-fault mimicking signature is generated upstream or downstream of said device.

20. A device according to claim 18, further comprising a remote monitoring device, wherein said monitoring device receives said encoded output signal from said detector, and wherein said remote monitoring device interprets said category of arc-mimicking fault signature therefrom.

21. A device according to claim 14, wherein said encoded output signal indicates if said arc fault is upstream or downstream of said device.

22. A device according to claim 14, wherein said encoded output signal indicates whether said arc fault signature is produced by a series or a parallel arc fault.

23. A device according to claim 14, wherein said encoded output signal is sent to one of a blinking light, a portable tester, a monitoring device, and a computer.

24. A device according to claim 14, further comprising a reset button, wherein said encoded output signal terminates upon an actuation of said reset button.

25. A device according to claim 14, further comprising a lamp indicator, wherein said encoded output signal includes a family of repeating blinking patterns visibly discernable from said lamp indicator.

26. A device according to claim 14, further comprising a remote monitoring device, wherein said remote monitoring device receives said encoded output signal from said detector.

27. A device according to claim 26, further comprising:

an arc fault detector housing; and

a monitoring port integral to said arc fault detector housing;

wherein said remote monitoring device receives said encoded output signal via said monitoring port.

28. A device according to claim 26, further comprising a modem for communicating said encoded output signal from said detector to said remote monitoring device.

29. A device according to claim 26, wherein said encoded output signal includes a pulse train whose pattern is discernable by said remote monitoring device.

30. A device according to claim 26, wherein said encoded output signal includes a pulse whose pulse width is discernable by said remote monitoring device.

31. A device according to claim 14 in which said sensor is a current sensor that monitors the current through said load.

32. A device according to claim 31, further comprising:

a plurality of line terminals for connection of said device to a voltage supply of said electrical distribution system; and

a voltage sensor for monitoring a voltage across said line terminals;

wherein signals from said voltage sensor and said current sensor are interpreted by said detector to determine whether said arc fault is upstream or downstream of said device.

33. A device according to claim 31, further comprising:

a plurality of line terminals for connection of said device to a voltage supply of said electrical distribution system; and

a voltage sensor for monitoring a voltage across said line terminals;

wherein signals from said voltage sensor and said current sensor are interpreted by said detector to determine whether said signals are indicative of an arc-fault mimicking generator, and whether said generator is upstream or downstream of said device.

34. A device according to claim 15, wherein said device is housed in one of a receptacle, circuit breaker, box, and plug.

35. A plurality of arc fault protective devices protective of an electrical circuit, comprising:

an array of sensors disposed at at least two different locations in said electrical circuit for sensing a variety of arc fault signatures;

an array of detectors operatively associated with said array of sensors for detecting what category of arc faults are indicated by said sensed arc fault signature;

wherein said array of detectors produces encoded output signals indicative of said category of arc fault.

36. A device according to claim 35, further comprising a remote monitor, wherein said encoded output signals are analyzed to determine a probable location of said arc fault.

37. A device according to claim 35, wherein said plurality of devices are housed as a combination of receptacles, circuit breakers, boxes, and plugs.

38. A protection device for an electrical circuit having a load, comprising:

a sensor operatively associated with said electrical circuit which senses current changes and/or voltage fluctuations in said electrical circuit; and

a detector which receives input from said sensor and compares said input to known arc fault mimicking signatures to determine what category of mimicked arc fault occurs;

wherein said detector produces an encoded output signal indicative of said category of mimicked arc fault.

39. A protection device for an electrical circuit having a load, comprising:

a sensor operatively associated with said electrical circuit which senses ranges of current to ground; and

a detector which receives input from said sensor,

wherein said detector produces encoded output signals unique to each range.

40. A device according to claim 39, wherein one of said ranges is associative with arc faults.

41. A testing device for testing an electrical circuit having a load and an electrical protector therein that protects said electrical circuit from a variety of arc faults, wherein said testing device is equipped to receive encoded signals from said electrical protector for identifying a category of arc fault.

42. A device according to claim 41, wherein said testing device and said electrical protector are in separate housings.

43. A device according to claim 41, further comprising an indicator, wherein said encoded signal is discernable from said indicator.

44. A device according to claim 41, wherein said testing device is equipped to receive encoded signals for identifying a location of said arc fault.

45. A device according to claim 41, wherein said variety of arc faults includes a glowing connection fault.

46. A protection device for an electrical circuit having a load, comprising:

a sensor operatively associated with said electrical circuit which senses current and/or voltage fluctuations in said electrical circuit; and

a detector which receives input from said sensor for detecting signatures associated with glowing connections,

wherein said detector produces a unique encoded output signal indicative of said glowing connection.

47. A device according to claim 46, wherein said detector produces an encoded output signal indicative of a location of said glowing connection.

48. A testing device for testing an electrical circuit having a load and an electrical protector therein responsive to arc faults and/or arc mimicking faults, wherein said testing device is equipped to receive encoded signals from said electrical protector for identifying an upstream or downstream location of said arc or arc-mimicking fault.

49. A method for detecting an electrical fault in an electrical circuit, comprising the steps of:

sensing current changes and voltage fluctuations in at least one location in said electrical circuit;

detecting what category of fault occurs by comparing said current changes and voltage fluctuations to known arc fault signatures; and

outputting a unique code associated with each different fault detected.

50. A method according to claim 49, wherein said step of detecting includes comparing said current changes and voltage fluctuations to known arc fault mimicking signatures, and wherein said step of outputting includes outputting a unique code associated with each different mimicked arc fault detected.

51. A method according to claim 50, wherein said step of detecting includes determining whether said mimicked arc fault occurs upstream or downstream of said at least one location.

52. A method according to claim 49, wherein said step of detecting includes determining whether said arc fault occurs upstream or downstream of said at least one location.

53. A method according to claim 52, wherein said step of outputting includes sending said unique code to a monitoring device.

54. A method according to claim 49, wherein said step of outputting includes sending said unique code to a monitoring device.