System and method for detecting impaired electric power equipment

• US 8,768,636 B2
• Filed: 12/12/2008
• Issued: 07/01/2014
• Est. Priority Date: 05/27/2005
• Status: Active Grant

• Current Assignee: Exacter, Inc.
• Original Assignee: Exacter, Inc.
• Inventors: Hayes, Raymond M., Klinect, David A., McCullough, Jason
• Primary Examiner(s): Lau, Tung S
• Application Number:
  US12/333,388
• Publication Number:
  US 20090192736A1
• Time in Patent Office: 2,027 Days
• Field of Search: 702/60
• 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
• CPC Class Codes: G01R 31/001 Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing measuring electromagnetic fields G01R29/08; circuits for generating HV pulses in dielectric strength testing G01R31/14
• CPC Class Codes: G01R 31/088 Aspects of digital computing

Abstract

A system and method for detecting impaired electric power equipment. An exemplary embodiment 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 may determine the time and/or location during testing. As a result, an exemplary embodiment 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 band pass filter adapted to receive said analog output of said signal detection circuit comprising an 8^th-order filter further comprising inductor-capacitor pairs embodying frequency cut-off characteristics to pass signals having frequencies in the range of about 130 MHz and 170 MHz and more preferably in the range of about 145 MHz and 155 MHz;

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

a digital signal processing circuit adapted to receive said digital signal from said analog-to-digital converter and identify a modulation component associated with spiking and having a frequency component within a predetermined frequency band;

a location tracking circuit adapted to receive location data;

a timing circuit adapted to determine time data;

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;

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 derived from said data from said modulation component and said location data wherein said mapping program is adapted to show the levels of electromagnetic radiation relative to said location data.

2. The system of claim 1 further comprising:

an antenna in communication with said signal detection circuit; and

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 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.

7. 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.

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

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

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

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

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

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