System for monitoring a switchgear

Patent metadata

Field	Value
Publication number	US-12412261-B2
Application number	US-202318320404-A
Country	US
Kind code	B2
Filing date	May 19, 2023
Priority date	Aug 30, 2019
Publication date	Sep 9, 2025
Grant date	Sep 9, 2025

Abstract

A system for monitoring a switchgear includes: an infrared camera for acquiring at least one infrared image of the switchgear; a processing unit for determining a pixel in the at least one infrared image associated with a hottest temperature, determining e pixels in the at least one infrared image associated with a temperature that is within a threshold temperature of the hottest temperature, and determining that a hot spot exists in the switchgear as a determination, the determination being a utilization of the determined pixels in the at least one infrared image; and an output unit for outputting an indication of a fault in the switchgear based on the determined hot spot.

First claim

What is claimed is:

1. A system for monitoring a switchgear, the system comprising:
a processing unit configured to:
acquire at least one infrared image of the switchgear, wherein the at least one image comprises a first infrared image and a second infrared image acquired after the first infrared image;
determine a pixel in the at least one infrared image associated with a hottest temperature, wherein the processing unit is further configured to determine a pixel in the first infrared image associated with a hottest temperature of the first infrared image and determine a pixel in the second infrared image associated with a hottest temperature of the second infrared image;
determine pixels in the at least one infrared image associated with a temperature that is within a threshold temperature of the hottest temperature, wherein the processing unit is further configured to determine pixels in the first infrared image associated with a temperature that is within the threshold temperature of the hottest temperature in the first infrared image and determine pixels in the second infrared image associated with a temperature that is within the threshold temperature of the hottest temperature in the second infrared image;
determine that a hot spot exists in the switchgear as a determination, the determination comprising a utilization of the determined pixels in the at least one infrared image, wherein the processing unit is further configured to determine that the hot spot exists in the switchgear based on a comparison of the determined pixels in the first infrared image with the determined pixels in the second infrared image; and

an output unit configured to output an indication of a fault in the switchgear based on the determined hot spot.

2. The system according to claim 1 , wherein the threshold temperature comprises a fixed temperature range.

3. The system according to claim 1 , wherein determining that the hot spot exists comprises an analysis of one or more of:
a shape of at least one region within the determined pixels in the at least one infrared image,
a size of the at least one region within the determined pixels in the at least one infrared image,
a position of the at least one region within the determined pixels in the at least one infrared image,
a number of the at least one region within the determined pixels in the at least one infrared image,
a number of pixels within the determined pixels in the at least one infrared image.

4. The system according to claim 3 , wherein determining that the hot spot exists comprises determining that a region in the second infrared image is smaller than a corresponding region in the first infrared image.

5. The system according to claim 3 , wherein determining that the hot spot exists comprises determining that a number of regions in the second infrared image is smaller than a number of regions in the first infrared image.

6. The system according to claim 5 , wherein determining that the hot spot exists comprises determining that the number of regions in the second image is one.

7. The system according to claim 3 , wherein the switchgear comprises two or more components of a same type that are loaded with substantially a same current, wherein determining that the hot spot exists comprises determining of one or more of:
a shape of a first region within the determined pixels in the at least one infrared image is different than a shape of a second region within the determined pixels in the at least one infrared image,
a size of a first region within the determined pixels in the at least one infrared image is different than a size of a second region within the determined pixels in the at least one infrared image,
a position within the determined pixels in the at least one infrared image is not associated with a position of the two or more components,
a number of the at least one region within the determined pixels in the at least one infrared image is less than a number of the two or more components.

8. The system according to claim 7 , wherein determining that the hot spot exists comprises determining that there is only one region within the determined pixels in the at least one infrared image.

9. The system according to claim 1 , wherein determining that the hot spot exists comprises generating of at least one binary image, and wherein the determined pixels in the at least one infrared image are given a different binary value than remaining pixels in the at least one infrared image.

10. The system according to claim 1 , wherein determining that the hot spot exists comprises a utilization of a machine learning algorithm.

11. The system according to claim 10 , wherein the machine learning algorithm comprises a trained neural network.

12. The system according to claim 1 , wherein the processing unit is further configured to:
acquire a visible image of the switchgear, and
overlay the determined pixels in the at least one infrared image onto a corresponding at least one location in the visible image.

13. The system according to claim 1 , wherein the at least one image comprises a plurality of infrared images acquired at different times, and wherein the processing unit is further configured to:
determine a pixel in each of the plurality of infrared images associated with a hottest temperature in each of the plurality of infrared images,
determine pixels in each of the plurality of infrared images associated with a temperature that is within the threshold temperature of the hottest temperature in each of the plurality of infrared images and calculate a number of determined pixels in each of the plurality of infrared images, and
wherein the determination that the hot spot exists comprises a determination of a rate of change of the number of determined pixels with time.

14. The system according to claim 13 , wherein the determination that the hot spot exists comprises a comparison of the rate of change of the number of determined pixels with time against a baseline rate of change of the number of determined pixels with time.

15. A system for monitoring a switchgear, the system comprising a processing unit configured to:
acquire at least one infrared image of the switchgear, wherein the at least one image comprises a first infrared image and a second infrared image acquired after the first infrared image;
determine a pixel in the at least one infrared image associated with a hottest temperature, wherein determining the pixel further comprises determining a pixel in the first infrared image associated with a hottest temperature of the first infrared image and determining a pixel in the second infrared image associated with a hottest temperature of the second infrared image;
determine pixels in the at least one infrared image associated with a temperature that is within a threshold temperature of the hottest temperature, wherein determining the pixels further comprises determining pixels in the first infrared image associated with a temperature that is within the threshold temperature of the hottest temperature in the first infrared image and determining pixels in the second infrared image associated with a temperature that is within the threshold temperature of the hottest temperature in the second infrared image;
determine that a hot spot exists in the switchgear as a determination, the determination comprising a utilization of the determined pixels in the at least one infrared image, wherein determining that the hot spot exists further comprises determining that the hot spot exists in the switchgear based on a comparison of the determined pixels in the first infrared

Assignees

• Abb Schweiz Ag

Inventors

• Gitzel Ralf
• Wildermuth Stephan
• Gebhardt Joerg
• Ostrowski Joerg
• Kaufmann Patrik

Classifications

• H04N23/20

  for generating image signals from infrared radiation only · CPC title

• H04N7/18

  Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast · CPC title

• G06T2207/30164

  Workpiece; Machine component · CPC title

• G06T2207/20084

  Artificial neural networks [ANN] · CPC title

• G06T2207/20081

  Training; Learning · CPC title