System and method for detecting impaired electric power equipment

• US 20060271312A1
• Filed: 05/27/2005
• Published: 11/30/2006
• Est. Priority Date: 05/27/2005
• Status: Active Grant

• Current Assignee: Exacter, Inc.
• Original Assignee: American Electric Power Company Incorporated
• Inventors: Klinect, David A., Hayes, Raymond M.
• Granted Patent: US 7,467,049 B2
• Time in Patent Office: Days
• US Class Current: 702/60
• CPC Class Codes: G01R 29/0871 Complete apparatus or systems; circuits, e.g. receivers or amplifiers G01R29/0878, G01R29/0892 take precedence; dosimeters, warning devices G01R29/0857

Abstract

The present invention is directed to a system and method for detecting impaired electric power equipment. An exemplary embodiment of the present invention may receive electromagnetic radiation and process the resulting signal. For example, signal processing may be used to identify electromagnetic radiation having a particular pattern that is characteristic of electric power equipment. Furthermore, an embodiment of the present invention may determine the time and/or location during testing. As a result, the present invention may be useful for stationary and/or mobile testing of an electrical system.

Claims

1. A system for detecting impaired electric power equipment that produces an increased level of electromagnetic radiation, said system comprising:

a signal detection circuit adapted to produce an analog output that is proportional to a level of electromagnetic radiation;

a timing circuit adapted to determine time data;

a location tracking circuit adapted to receive location data;

a low pass filter adapted to receive said analog output of said signal detection circuit;

an analog-to-digital converter in electrical communication with said low pass filter, said analog-to-digital converter adapted to convert an output of said low pass filter into a digital signal;

a digital signal processing circuit adapted to receive said digital signal and identify a modulation component having a frequency component within a predetermined frequency band; and

a computing device in electrical communication with said timing circuit, said location tracking circuit, and said digital signal processing circuit, said computing device adapted to process data from said modulation component and said location data.

2. The system of claim 1 further comprising:

an antenna in communication with said signal detection circuit;

wherein said antenna is adapted to receive electromagnetic radiation.

3. The system of claim 2 wherein said antenna is not resonant within the operating frequency range of electric power equipment that said system is adapted to survey.

4. The system of claim 2 wherein said antenna is resonant within the operating frequency range of electric power equipment that said system is adapted to survey.

5. The system of claim 2 wherein said antenna is a directional antenna.

6. The system of claim 1 wherein said analog output is an audio frequency output.

7. The system of claim 1 wherein said analog output is adapted to be a voltage proportional to a time-varying level of electromagnetic radiation detected by said signal detection circuit in a predetermined frequency range.

8. The system of claim 1 wherein said signal detection circuit is adapted to detect electromagnetic radiation in a frequency range of about 2-11 MHz.

9. The system of claim 1 wherein said signal detection circuit is adapted to detect electromagnetic radiation in a frequency range of about 73-74.6 MHz.

10. The system of claim 1 wherein said location tracking circuit and said timing circuit are provided by a global positioning system (GPS) circuit.

11. The system of claim 1 wherein said low pass filter is adapted to limit aliasing during conversion of said output of said low pass filter into said digital signal.

12. The system of claim 1 wherein said predetermined frequency band is inclusive of 120 Hz modulation.

13. The system of claim 1 wherein said predetermined frequency band is inclusive of a fundamental frequency of a source of electromagnetic radiation.

14. The system of claim 1 wherein said predetermined frequency band is inclusive of a second harmonic frequency of a source of electromagnetic radiation.

15. The system of claim 1 wherein said computing device is a microcontroller.

16. The system of claim 1 further comprising a memory device in electrical communication with said computing device, said memory device adapted to store said data related to said modulation component and said location data.

17. The system of claim 1 further comprising a mapping program adapted to produce a map derived from said data from said modulation component and said location data.

18. The system of claim 17 wherein said mapping program is adapted to show the levels of electromagnetic radiation relative to said location data.

19. The system of claim 18 wherein said electric power equipment is a power line.

20. The system of claim 1 further comprising:

a memory device in electrical communication with said computing device, said memory device adapted to store said data related to said modulation component and said location data; and

a mapping program adapted to produce a map showing a variation of electromagnetic radiation signal strength with location.

21. A system for detecting impaired electric power equipment, said system comprising:

a signal detection circuit adapted to produce an analog output that is proportional to a level of electromagnetic radiation;

a global positioning system (GPS) circuit adapted to receive location data;

an analog filter adapted to receive said analog output of said signal detection circuit, said analog filter adapted to prevent aliasing during conversion of said analog output of said signal detection circuit;

an analog-to-digital converter in electrical communication with said analog filter, said analog-to-digital converter adapted to convert an output of said analog filter into a digital signal;

a digital signal processing circuit adapted to receive said digital signal and identify a modulation component having a frequency component within a predetermined frequency band;

a microcontroller in electrical communication with said GPS circuit and said digital signal processing circuit, said microcontroller adapted to process data from said modulation component and said location data;

a memory device in electrical communication with said microcontroller, said memory device adapted to store said data related to said modulation component and said location data; and

a mapping program adapted to produce a map showing a variation of electromagnetic radiation signal strength with location.

22. The system of claim 21 wherein said analog output is an audio frequency output.

23. The system of claim 21 wherein said signal detection circuit is adapted to detect electromagnetic radiation in a frequency range of about 2-11 MHz.

24. The system of claim 21 wherein said signal detection circuit is adapted to detect electromagnetic radiation in a frequency range of about 73-74.6 MHz.

25. The system of claim 21 further comprising:

an antenna in communication with said signal detection circuit;

wherein said antenna is adapted to receive electromagnetic radiation.

26. The system of claim 25 wherein said antenna is not resonant within the operating frequency range of electric power equipment that said system is adapted to survey.

27. The system of claim 21 wherein said digital signal processing circuit is adapted to identify a modulation component having a frequency component of approximately 120 Hz.

28. A method of detecting impaired electric power equipment, said method comprising:

providing a signal detection circuit and a global positioning system (GPS) circuit in a vehicle;

simultaneously detecting electromagnetic radiation and receiving location data while moving in a path in the vicinity of electric power equipment;

producing a digital signal derived from said electromagnetic radiation;

processing said digital signal to identify a modulation component having a frequency component within a predetermined frequency band;

processing data from said modulation component and said location data; and

creating a map showing the levels of electromagnetic radiation produced by said electric power equipment.

29. The method of claim 28 wherein:

said signal detection circuit is in communication with an antenna that is secured to said vehicle; and

said antenna is not resonant within the operating frequency range of said electric power equipment.

30. The method of claim 28 wherein electromagnetic radiation is detected in a frequency range of about 2-11 MHz.

31. The method of claim 28 wherein electromagnetic radiation is detected in a frequency range of about 73-74.6 MHz.

32. The method of claim 28 wherein the step of producing a digital signal comprises:

producing an audio frequency signal derived from a modulation of said electromagnetic radiation;

filtering said audio frequency signal in a low pass filter to limit aliasing during sampling; and

sampling said audio frequency signal.

33. The method of claim 28 further comprising the step of storing said data related to said modulation component and said location data prior to creation of said map.

34. A system for detecting electromagnetic radiation emitted by an electrical system, said system comprising:

a signal detection circuit adapted to produce an analog output that is proportional to a level of electromagnetic radiation;

a timing circuit adapted to determine time data;

a low pass filter adapted to receive said analog output of said signal detection circuit;

an analog-to-digital converter in electrical communication with said low pass filter, said analog-to-digital converter adapted to convert an output of said low pass filter into a digital signal;

a digital signal processing circuit adapted to receive said digital signal and identify a modulation component having a frequency component within a predetermined frequency band; and

a computing device in electrical communication with said timing circuit and said digital signal processing circuit, said computing device adapted to process data from said modulation component and said location data.

35. The system of claim 34 wherein said timing circuit is a global positioning system (GPS) circuit.

36. The system of claim 34 further comprising an operational record adapted to relate the operation of electrical equipment with time data.

37. The system of claim 34 further comprising:

an antenna in communication with said signal detection circuit;

wherein said antenna is adapted to receive electromagnetic radiation.

38. The system of claim 37 wherein said antenna is not resonant within the operating frequency range of said electrical system that said system is adapted to survey.

39. The system of claim 34 wherein said analog output is an audio frequency output.

40. The system of claim 34 wherein said analog output is adapted to be a voltage proportional to a time-varying level of electromagnetic radiation detected by said signal detection circuit in a predetermined frequency range.

41. The system of claim 34 wherein said signal detection circuit is adapted to detect electromagnetic radiation in a frequency range of about 2-11 MHz.

42. The system of claim 34 wherein said signal detection circuit is adapted to detect electromagnetic radiation in a frequency range of about 73-74.6 MHz.

43. The system of claim 34 wherein said low pass filter is adapted to limit aliasing during conversion of said output of said low pass filter into said digital signal.

44. The system of claim 34 wherein said predetermined frequency band is inclusive of 120 Hz modulation.

45. The system of claim 34 wherein said computing device is a microcontroller.

46. The system of claim 34 further comprising a memory device in electrical communication with said computing device, said memory device adapted to store said data related to said modulation component and said time data.

47. A method of detecting impaired electric power equipment, said method comprising:

providing a signal detection circuit and a timing circuit;

simultaneously detecting electromagnetic radiation and determining time data;

producing a digital signal derived from said electromagnetic radiation;

processing said digital signal to identify a modulation component having a frequency component within a predetermined frequency band;

processing data from said modulation component and said time data; and

comparing said data from said modulation component with an operational record of electric power equipment.

48. The method of claim 47 wherein:

said signal detection circuit is in communication with an antenna; and

said antenna is not resonant within the operating frequency range of said electrical equipment.

49. The method of claim 47 wherein electromagnetic radiation is detected in a frequency range of about 2-11 MHz.

50. The method of claim 47 wherein electromagnetic radiation is detected in a frequency range of about 73-74.6 MHz.

51. The method of claim 47 wherein the step of producing a digital signal comprises:

producing an audio frequency signal derived from said electromagnetic radiation;

filtering said audio frequency signal in a low pass filter to limit aliasing during sampling; and

sampling said audio frequency signal.

52. The method of claim 47 further comprising the step of storing said data related to said modulation component and said time data prior to said comparison step.