Apparatus and method for monitoring and controlling detection of stray voltage anomalies

• US 8,482,274 B2
• Filed: 09/14/2012
• Issued: 07/09/2013
• Est. Priority Date: 12/23/2004
• Status: Active Grant

• Current Assignee: Osmose Utilities Services Incorporated (Osmose Holdings Incorporated)
• Original Assignee: Power Survey LLC
• Inventors: Kalokitis, David, Schultz, Leonard Joshua, Polyzois, Christos Alkiviadis, Paragano, Vincent Jr.
• Primary Examiner(s): Koval, Melissa
• Assistant Examiner(s): Baldridge, Benjamin M
• Application Number:
  US13/618,696
• Publication Number:
  US 20130015979A1
• Time in Patent Office: 298 Days
• Field of Search: 324/71
• US Class Current: 324/72
• 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 29/0878 Sensors; antennas; probes; detectors wave guide measuring sections G01R1/24
• CPC Class Codes: G01R 29/14 Measuring field distribution
• CPC Class Codes: G01R 31/085 in power transmission or distribution lines, e.g. overhead

Abstract

Apparatus and methods for detecting stray voltage anomalies in electric fields are provided herein. In some embodiments, an apparatus for detecting an electrical field may comprise: at least one sensor probe for generating data corresponding to an electrical field detected by the at least one sensor probe, wherein the at least one sensor probe comprises at least one electrode; a processor, coupled to the at least one sensor probe, for analyzing the data to identify a voltage anomaly in the electric field; and an indicator, coupled to the processor, for alerting a user to a presence of the voltage anomaly in the electric field.

Claims

1. A mobile apparatus mounted to a motor vehicle for detecting an electric field, comprising:

at least one sensor probe, coupled to an electrically non-interfering support frame mounted to the vehicle, that generates a signal corresponding to an electric field detected by the at least one sensor probe as the sensor probe moves past a plurality of conductive objects proximate a street, wherein the at least one sensor probe comprises two or more electrodes, and wherein the two or more electrodes are each separated by a rigid insulator;

a processor, coupled to the at least one sensor probe, that digitizes the signal to form electric field data represented as a plurality of time domain samples, produces field strengths of each of the at least one sensor probes using the plurality of time domain samples, and analyzes the field strengths to identify a line frequency voltage anomaly in the electric field, wherein the electric field data is analyzed based on an expected frequency pertaining to the line frequency voltage anomaly and wherein the voltage anomaly is generated by leakage of electric power from a power grid to at least one energized object in the plurality of conductive objects proximate the street; and

an indicator, coupled to the processor, that alerts a user to a presence of the voltage anomaly in the electric field and indicates that at least one conductive object proximate the street is energized to a potentially harmful level.

2. The apparatus of claim 1, further comprising at least one analog to digital converter coupled to each of the two or more electrodes for digitizing electric signals received from the two or more electrodes representative of the electric field detected.

3. The apparatus of claim 1, further comprising:

at least one measuring device mounted to the vehicle for determining at least one of the location of the apparatus, a distance traveled by the apparatus, or a speed at which the apparatus is moving.

4. The apparatus of claim 1, wherein producing the field strengths further using the plurality of time domain samples further comprises:

using a Fast Fourier Transform at a rate that is a multiple of an expected frequency of the electric field to transform the plurality of time domain samples into at least one frequency domain sample.

5. The apparatus of claim 4, wherein the indicator is at least one of an audio or visual indicator and the audio indicator emits a variable pitched tone corresponding to a magnitude of the measured electric field.

6. The apparatus of claim 1, further comprising at least one camera for collecting video images of a patrolled area.

7. The apparatus of claim 1, further comprising a wireless transceiver for transmitting and receiving data to and from at least one remote device.

8. The apparatus of claim 1, further comprising a computer having a graphical user interface that displays electric field signal strength data, and analyzing and capturing a monitored event within the depicted electric field signal strength data.

9. The apparatus of claim 8, further comprising:

at least one camera, coupled to the computer, for collecting video images of a patrolled area, wherein the collected video images are displayed on the graphical user interface along with the display of the electric field signal strength.

10. The apparatus of claim 9, wherein the graphical display of data further comprises:

a raw electric field measurement plot;

an adaptive threshold plot; and

a processed electric field measurement plot.

11. The apparatus of claim 10, wherein the adaptive threshold plot is set relative to a local ambient or background noise level that is generated from data gathered prior to measurement of raw electric field data.

12. The apparatus of claim 10, wherein the graphical display of data further comprises:

an indicator to alert a user to the presence of a voltage anomaly in the electric field, wherein the voltage anomaly in the electric field is present when the processed electric field measurement plot exceeds the adaptive threshold plot.

13. A method for detecting an electric field using a mobile apparatus mounted to a motor vehicle, comprising:

sensing an electric field using at least one sensor probe as the sensor probe moves past a plurality of conductive objects proximate a street, coupled to an electrically non-interfering support frame mounted to the vehicle, wherein the at least one sensor probe comprises two or more electrodes, wherein the two or more electrodes are each separated by a rigid insulator;

identifying a location of the at least one sensor probe;

digitizing electric signals representative of the electric fields sensed by the sensor probe to create data representing the electric fields as a plurality of time domain samples, and determines field strength of the at least one sensor probe using the plurality of time domain samples;

collecting data representing the electric field sensed by the at least one sensor probe;

processing the collected data, wherein the digitized electric signals within the collected data are averaged commensurate with a speed at which the at least one sensor probe is moving;

analyzing the collected data to identify a line frequency voltage anomaly in the electric field, wherein the voltage anomaly is generated by leakage of electric power from a power grid to an energized object; and

providing an indicator to alert a user to a presence of the voltage anomaly in the electric field indicating that at least one conductive object proximate the street is energized to a potentially harmful level.

14. The method of claim 13, wherein the indicator is at least one of an audio or visual indicator.

15. The method of claim 13, wherein processing the digitized electrical signals comprises using a Fast Fourier Transform at a rate that is a multiple of an expected frequency of the electric field.

16. The method of claim 15, wherein processing the digitized electrical signals further comprises averaging the Fast Fourier Transformed digitized electrical signals at a rate that is representative of the speed at which the at least one sensor probe is moving.

17. The method of claim 15, wherein processing the digitized electrical signals further comprises comparing the averaged Fast Fourier Transformed digitized electrical signals to a threshold value for providing an indication of the voltage anomaly in the electric field.

18. The method of claim 13, further comprising:

storing at least one of the data corresponding to the electric field detected by the at least one sensor probe, data corresponding to the location of the at least one sensor probe, or data corresponding to the speed of which the at least one sensor probe is moving to a storage device.