Apparatus and method for diagnosing electric power equipment using thermal imaging camera

• US 10,746,763 B2
• Filed: 08/29/2016
• Issued: 08/18/2020
• Est. Priority Date: 08/31/2015
• Status: Active Grant

• Current Assignee: Korea Electric Power Corporation (Government of South Korea)
• Original Assignee: Korea Electric Power Corporation (Government of South Korea)
• Inventors: Jang, Kwang-Heung, Lee, Kang-Se, Jung, Byoun-Hun, Byun, Doc-Jun, Choi, Min-Hee, Park, Yong-Woo
• Primary Examiner(s): Fortich, Alvaro E
• Application Number:
  US15/755,906
• Publication Number:
  US 20180340962A1
• Time in Patent Office: 1,450 Days
• CPC Class Codes: G01J 2005/0077 Imaging
• CPC Class Codes: G01J 5/0066 for hot spots detection
• CPC Class Codes: G01J 5/0096 for measuring wires, electrical contacts or electronic systems
• CPC Class Codes: G01N 25/72 Investigating presence of flaws
• CPC Class Codes: G01R 13/36 using length of glow discharge, e.g. glowlight oscilloscopes
• CPC Class Codes: G01R 31/1218 using optical methods; using charged particle, e.g. electron, beams or X-rays

Abstract

Disclosed are an apparatus and method for diagnosing electric power equipment. The apparatus includes a measuring unit including a pan/tilt module mounted on the top of a vehicle and an imaging module mounted on an upper portion of the pan/tilt module, a determination unit for determining whether electric power equipment is detected by the measuring unit, a controller for performing control to capture a thermal image of the electric power equipment using the measuring unit, and a processing unit for dividing the thermal image into an analysis target equipment region, a non-interest equipment region, and a background noise region through pattern analysis of the thermal image and diagnosing the electric power equipment as being normal or as being abnormal on the basis of temperature information included in the analysis target equipment region.

Claims

1. An apparatus for diagnosing electric power equipment, the apparatus comprising:

an imaging unit including a pan/tilt module mounted to an upper surface of a vehicle and an image sensor mounted on an upper portion of the pan/tilt module, the imaging unit being configured to capture a thermal image of the electric power equipment, the pan/tilt module being configured to rotate and/or pivot the image sensor; and

a processor configured to;

determine whether electric power equipment is detected by the imaging unit,

control the imaging unit to capture a thermal image of the electric power equipment, and

perform pattern analysis on the thermal image to divide the thermal image into an analysis target equipment region, a non-interest equipment region, and a background noise region, and diagnosing the electric power equipment as being normal or as being abnormal based on temperature information included in the analysis target equipment region.

2. The apparatus set forth in claim 1, wherein the processor is further configured to generate a histogram based on temperature information included in the thermal image, classify regions of the histogram into three histogram sub-regions using a preset equipment temperature range as a reference, and binarize the thermal image based on the three histogram sub-regions, thereby performing pattern classification.

3. The apparatus as set forth in claim 2, wherein classifying the three histogram sub-regions is performed by analyzing the histogram in order of temperature from a higher temperature to a lower temperature.

4. The apparatus as set forth in claim 2, wherein the processor is further configured to classify a region having a temperature exceeding the preset equipment temperature range in the thermal image as the non-interest equipment region.

5. The apparatus as set forth in claim 2, wherein the processor is further configured to classify a region having a temperature below the preset equipment temperature as the background noise region.

6. The apparatus as set forth in claim 2, wherein the processor is further configured to derive a temperature corresponding to the largest number of pixels in the histogram sub-region for the analysis target equipment region as an equipment temperature, and sets a span temperature range by adding and subtracting a preset span temperature value to and from the equipment temperature.

7. The apparatus as set forth in claim 6, wherein the span temperature range is divided into a plurality of temperature levels, and the processor is configured to display, via a display, the analysis target equipment region in different colors according to the respective temperature levels.

8. The apparatus as set forth in claim 6, wherein the processor is further configured to diagnose the electric power equipment as being normal or as being abnormal based on the equipment temperature according to a predetermined determination criterion.

9. The apparatus as set forth in claim 1, further comprising a positioning system configured to estimate and track a position of the vehicle, wherein the processor is further configured to diagnose for each piece of electric power equipment among a plurality of pieces of electric power equipment installed on a plurality of electric poles, based on information on the electric poles, which is preliminarily prepared and stored.

10. The apparatus as set forth in claim 1, wherein the imaging unit further comprises a temperature and humidity sensor configured to measure air temperature and ambient humidity.

11. A method of diagnosing electric power equipment, the method comprising:

determining whether electric power equipment is detected by an imaging unit including a pan/tilt module mounted on an upper surface of a vehicle and an image sensor mounted on an upper portion of the pan/tilt module, the imaging unit being configured to capture a thermal image of the electric power equipment, the pan/tilt module being configured to rotate and/or pivot the image sensor;

controlling the imaging unit to capture a thermal image of the electric power equipment when the electric power equipment is determined as being detected;

dividing, by a processor, the thermal image into an analysis target equipment region, a non-interest equipment region, and a background noise region by performing pattern analysis on the thermal image; and

diagnosing, by the processor, the electric power equipment as being normal or as being abnormal based on temperature information included in the analysis target equipment region.

12. The method as set forth in claim 11, wherein the dividing the thermal image into an analysis target equipment region, a non-interest equipment region, and a background noise region comprises:

generating a histogram based on temperature information included in the thermal image;

classifying regions of the histogram into three histogram sub-regions based on a preset equipment temperature range; and

binarizing the thermal image based on the three histogram sub-regions.

13. The method as set forth in claim 12, wherein the classifying regions of the histogram into three histogram sub-regions comprises:

analyzing the histogram in, order of temperature from a higher temperature to a lower temperature.

14. The method as set forth in claim 12, wherein the dividing the thermal image into an analysis target equipment region, a non-interest equipment region, and a background noise region comprises:

classifying a region having a temperature exceeding the preset equipment temperature range in the thermal image as the non-interest equipment region.

15. The method as set forth in claim 12, wherein the dividing the thermal image into an analysis target equipment region, a non-interest equipment region, and a background noise region comprises:

classifying a region having a temperature below the preset equipment temperature range as the background noise region.

16. The method as set forth in claim 12, wherein the diagnosing the electric power equipment as being normal or as being abnormal comprises:

deriving a temperature corresponding to the largest number of pixels in the histogram sub-region for the analysis target equipment region as an equipment temperature; and

setting a span temperature range by adding and subtracting a preset span temperature value to and from the equipment temperature.

17. The method as set forth in claim 16, wherein the span temperature range is divided into a plurality of temperature levels, and the processing unit displays the analysis target equipment region in different colors according to the respective temperature levels via a display unit.

18. The method as set forth in claim 16, wherein the diagnosing the electric power equipment as being normal or as being abnormal comprises:

determining whether the electric power equipment is normal or abnormal based on the equipment temperature according to a predetermined determination criterion.

19. The method as set forth in claim 11, further comprising:

by a positioning system configured to estimate and track a position of the vehicle, wherein the diagnosing the electric power equipment as being normal or as being abnormal is performed by distinguishing each piece of electric power equipment from, other pieces of electric power equipment among a plurality of pieces of electric power equipment installed on a plurality of electric poles, based on information on the electric poles, which is preliminarily prepared and stored.