Arc fault tester

• US 20040100274A1
• Filed: 06/03/2003
• Published: 05/27/2004
• Est. Priority Date: 11/22/2002
• Status: Abandoned Application

• Current Assignee: Siemens Energy & Automation Incorporated (Siemens AG)
• Original Assignee: Siemens Energy & Automation Incorporated (Siemens AG)
• Inventors: Gloster, William, Restrepo, Carlos
• Application Number:
  US10/453,105
• Publication Number:
  US 20040100274A1
• Time in Patent Office: Days
• US Class Current: 324/536
• CPC Class Codes: G01R 31/3277 of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches

Abstract

Arc fault detector device (such as arc fault circuit interrupter) testing apparatus and methods including generating a true arc fault current by energizing a contact relay at a predetermined frequency, applying and regulating the true arc fault current to a detection device under test by selecting a load from a resistor bank that is coupled to the tested device, determining whether the device under test was able to detect the arc fault current. The invention is useful for determining whether an arc fault circuit interrupter is capable of tripping in response to an arc fault current.

Claims

1. ) An apparatus for testing an arcing fault detector device, comprising:

an arc generator control circuit including,

an arc fault signal generator for generating an oscillating arc signal, and

a contact relay coupled to and energized by the arc fault signal generator;

a powered load coupled to the contact relay and a power source, so that an arcing current is generated upon oscillation of contacts within the relay; and

a device under test receptacle coupled to the power load and the arc generator control circuit for selective electrical coupling to an arc detection device.

2. ) The apparatus of claim 1, wherein the contact relay opens and closes at a predetermined frequency.

3. ) The apparatus of claim 2, wherein the predetermined frequency ranges between 10-20 hz.

4. ) The predetermined frequency of claim 3, wherein the contact relay opens and closes with an optimum frequency of 11 hz.

5. ) The apparatus of claim 1, wherein the arc generator control circuit comprises an operational amplifier oscillator.

6. ) The apparatus of claim 1, wherein the arc generator control circuit is powered by a DC power supply.

7. ) The apparatus of claim 1, wherein a device under test is powered by an AC power supply.

8. ) The apparatus of claim 1, wherein a load hot line and a load neutral line is powered by the AC power supply.

9. ) The apparatus of claim 1, wherein the AC outlet power supply comprises an outlet standard 120 V AC, 60 Hz.

10. ) The apparatus of claim 1, further comprising a selective load of at least two states and a load-selector switch coupled to the load.

11. ) The apparatus of claim 10, wherein the load-selector switch has a first position that selects to 75 A load.

12. ) The apparatus of claim 10, wherein the load-selector switch has a second position that selects a 35 A load.

13. ) The apparatus of claim 1, further comprising a transportable housing for containing the apparatus for testing the arcing fault detector device.

14. ) The apparatus of claim 13, wherein the transportable housing is shaped and sized as a hand held device.

15. ) The apparatus of claim 1, further comprising a cooling device for dissipating heat.

16. ) The apparatus of claim 15, wherein the cooling device is a fan.

17. ) A method for testing arcing fault interruption, the method comprising:

generating an arc current by selectively oscillating contacts of a relay that is coupled to a powered circuit including load, and a device under test receptacle having an arc detection device coupled thereto.

18. ) The method of claim 17, wherein the contacts relay is oscillated at a predetermined frequency range between 10-20 hz.

19. ) The method of claim 17, wherein the contact relay opens and closes with an optimum frequency of 11 hz.

20. ) The method of claim 17, further comprising a selective load of at least two states and a load-selector switch coupled to the load.

21. ) The method of claim 17, wherein the load-selector switch has a first position that selects 75 A load.

22. ) The method of claim 17, wherein the load-selector switch has a second position that selects 35 A load.

23. ) A method to generate an arc fault, method comprising:

selectively oscillating contacts of a relay that is coupled to a powered circuit.

24. ) The method of claim 23, wherein the contacts of the relay are oscillated at predetermined frequency ranges between 10-20 hz.

25. ) The method of claim 23, wherein the contact relay opens and closes with an optimum frequency of 11 hz.

26. ) A method for testing arcing fault interruption, the method comprising:

generating an arc fault current by energizing an operational amplification circuit to amplify a driving signal originating in an oscillator circuit;

energizing a pre-amplification stage circuit to amplify the driving signal sent through the operational amplification circuit;

energizing a contact relay at a predetermined frequency to create an arc fault; and

determining whether the device under test detects the arc fault current.

27. ) The method of claim 26, wherein the predetermined frequency ranges between 10-20 hz.

28. ) The method of claim 26, wherein the contact relay opens and closes with an optimum frequency of 11 hz.

29. ) An apparatus for testing an arcing fault detector device, comprising:

an arc generator control circuit means for generating an arc signal;

a contact relay means for generating an arc therein, coupled to and energized by the arc generator control circuit means;

a powered load coupled to the contact relay means, so that the contact relay means generates an arcing current; and

a device under test receptacle coupled to the power load and the arc generator control circuit means for selective electrical coupling to an arc detection device.

30. ) The apparatus of claim 29, wherein the contact relay means opens and closes at a predetermined frequency.

31. ) The apparatus of claim 29, wherein the predetermined frequency ranges between 10-20 hz.

32. ) The predetermined frequency of claim 30, wherein the contact relay means opens and closes with an optimum frequency of 11 hz.

33. ) The apparatus of claim 29, wherein the arc generator control circuit means comprises an operational amplifier oscillator.

34. ) The apparatus of claim 29, wherein the arc generator control circuit means is powered by a DC power supply.

35. ) The apparatus of claim 29, wherein a device under test is powered by an AC power supply.

36. ) The apparatus of claim 29, wherein a load hot line and a load neutral line is powered by the AC power supply.

37. ) The apparatus of claim 29, wherein the AC outlet power supply comprises an outlet standard 120 V AC, 60 Hz.

38. ) The apparatus of claim 29, further comprising a selective load of at least two states and a load-selector switch coupled to the load.

41. ) The apparatus of claim 29, further comprising a transportable housing for containing the apparatus for testing the arcing fault detector device.

42. ) The apparatus of claim 41, wherein the transportable housing is shaped and sized as a hand held device.

43. ) The apparatus of claim 29, further comprising a cooling device for dissipating heat.

44. ) The apparatus of claim 43, wherein the cooling device is a fan.

40. ) The apparatus of claim 40, wherein the load-selector switch has a second position that selects a 35 A load.

39. ) The apparatus of claim 40, wherein the load-selector switch has a first position that selects to 75 A load.