CN-122017488-A - Metal particle detection device and detection method for basin-type insulator

CN122017488ACN 122017488 ACN122017488 ACN 122017488ACN-122017488-A

Abstract

The application provides a metal particle detection device and a detection method for a basin-type insulator, wherein the metal particle detection device for the basin-type insulator comprises an imaging module, a heating module, a control module and an image processing module, wherein the imaging module is used for acquiring an infrared image before heating the surface of a region to be detected of the basin-type insulator to obtain a reference temperature field distribution image and acquiring an infrared image after heating the surface of the region to be detected of the insulator in real time to obtain a temperature field distribution image sequence, the heating module is used for providing uniform and controllable thermal radiation excitation for the region to be detected of the basin-type insulator, the control module is used for controlling the heating temperature and the heating time of the heating module, and the image processing module is used for identifying and positioning the metal particles on the surface of the region to be detected of the basin-type insulator according to the reference temperature field distribution image and the temperature field distribution image sequence, so that the initiative, the sensitivity and the safety detection of hundred-micrometer-level metal particles on the surface of the basin-type insulator are realized.

Inventors

LI CHAO
WANG HEFEI
WANG CHAOHUA
DU JUNLI
ZHU HUA
ZHAO YONGFENG
MA YUNRUI
WANG XIAOHUI
XIN WEIFENG

Assignees

国网河南省电力公司电力科学研究院
国网河南省电力公司

Dates

Publication Date: 20260512
Application Date: 20260205

Claims (10)

1. A metal particle detection apparatus for a basin-type insulator, comprising: The imaging module is used for acquiring an infrared image before the surface of the region to be detected of the basin-type insulator is heated to obtain a reference temperature field distribution image and acquiring the infrared image after the surface of the region to be detected of the insulator is heated in real time to obtain a temperature field distribution image sequence; the heating module is used for providing uniform and controllable thermal radiation excitation for the surface area to be detected of the basin-type insulator; The control module is electrically connected with the heating module and used for controlling the heating temperature and the heating time of the heating module; The image processing module is electrically connected with the infrared thermal imaging module and is used for identifying and positioning metal particles on the surface of the region to be detected of the basin-type insulator according to the reference temperature field distribution image and the temperature field distribution image sequence.
2. The metal particle detection apparatus according to claim 1, wherein a vertical distance between a lens of the imaging module and a surface of the region to be detected of the basin-type insulator is 0.5m.
3. The metal particle detection apparatus according to claim 2, wherein a vertical distance between the radiation port of the heating module and the surface of the region to be detected of the basin-type insulator is 0.5m.
4. A metal particle detection apparatus as claimed in claim 3 wherein the angle between the first line between the lens of the imaging module and the surface of the region to be detected of the bowl insulator and the second line between the radiation port of the heating module and the surface of the region to be detected of the bowl insulator is 20-25 °.
5. The metal particle detection apparatus of claim 1, wherein the image processing module is further configured to: Respectively calculating the temperature difference between each pixel point of each image of the temperature field distribution image sequence and each pixel point corresponding to the reference temperature field distribution image to obtain a plurality of difference values; Respectively judging whether the difference values are larger than a preset threshold value, if so, determining that the corresponding pixel points are metal particles; And determining the position of the metal particles according to the coordinates of the pixel points.
6. The metal particle detection apparatus of claim 1, wherein the imaging module is a thermal infrared imager.
7. The metal particle detection apparatus of claim 1, wherein the heating module is a microwave heater.
8. The apparatus according to claim 1, wherein the image processing module is a host computer.
9. The metal particle detection apparatus according to claim 1, wherein the control module comprises a feedback unit, a control unit, and a power adjustment unit.
10. A metal particle detection method based on the metal particle detection apparatus according to any one of claims 1 to 9, comprising the steps of: fixedly placing the basin-type insulator on a detection tool; Setting heating temperature and heating time of the heating module and sampling frame rate of the imaging module by using software built in the image processing module; the position and the angle of the imaging module and the heating module are respectively adjusted, so that the surface of the region to be detected of the basin-type insulator is clearly imaged in the view field of the imaging module; Under the non-thermal excitation state, an imaging module is utilized to acquire an infrared image of the surface of the region to be detected of the basin-type insulator as a reference temperature field distribution image; Starting a heating module, continuously or periodically heating the surface of the region to be detected of the basin-type insulator according to preset heating parameters, continuously until the heating is finished, continuously acquiring a section of cooling process, and simultaneously controlling an imaging module to continuously acquire images of the surface of the region to be detected of the basin-type insulator by using a control module to obtain a temperature field distribution image sequence; The method comprises the steps of analyzing an acquired image sequence by utilizing an image processing module, respectively comparing temperature differences between each pixel point of each image in the temperature field distribution image sequence and each pixel point of a reference temperature field distribution image to obtain a plurality of difference values, respectively judging whether the plurality of difference values are larger than a preset threshold value, if so, determining that the corresponding pixel point is a metal particle, and determining the position of the metal particle according to the coordinate of the pixel point.

Description

Metal particle detection device and detection method for basin-type insulator Technical Field The application relates to the technical field of nondestructive testing of high-voltage electrical equipment. More particularly, the application relates to a metal particle detection device and a detection method for a basin-type insulator. Background Basin-type insulators are key insulating components in gas-insulated switchgear, the surface cleanliness of which is directly related to the insulation reliability of the equipment. During manufacture, assembly or operation, metal particles on the order of hundred microns may be generated and adsorbed to the insulator surface. These tiny metal particles may move and jump under the action of an electric field to cause partial discharge and even cause insulation flashover, which is an important cause of the malfunction of the gas-insulated switchgear. Currently, detection of insulator surface defects is primarily dependent on X-ray imaging, ultrasonic detection, and conventional infrared thermography detection. These solutions have the following drawbacks, respectively: (1) X-ray imaging equipment is expensive, has radiation safety risks, and has insufficient contrast for low-density and tiny metal particles; (2) Ultrasonic detection has poor coupling effect on a flat basin-type insulator, and tiny particles are difficult to identify; (3) Conventional infrared thermography detection relies on the heating of the equipment itself, and for a basin-type insulator without current passing and obvious heating, cold metal particles adsorbed on the surface of the basin-type insulator cannot be effectively detected. Therefore, there is an urgent need for a solution that can actively, sensitively and safely detect hundred-micron-sized metal particles on the surface of a basin-type insulator. Disclosure of Invention In order to solve at least one or more of the technical problems mentioned above, the present application proposes, in various aspects, a metal particle detection apparatus and a detection method for a basin-type insulator. In a first aspect, the present application provides a metal particle detection apparatus for a basin-type insulator, comprising: The imaging module is used for acquiring an infrared image before the surface of the area to be detected of the basin-type insulator is heated, obtaining a reference temperature field distribution image, and acquiring the infrared image after the surface of the area to be detected of the insulator is heated in real time, so as to obtain a temperature field distribution image sequence. And the heating module is used for providing uniform and controllable thermal radiation excitation for the surface area to be detected of the basin-type insulator. And the control module is electrically connected with the heating module and is used for controlling the heating temperature and the heating time of the heating module. The image processing module is electrically connected with the infrared thermal imaging module and is used for identifying and positioning metal particles on the surface of the region to be detected of the basin-type insulator according to the reference temperature field distribution image and the temperature field distribution image sequence. In some examples, a vertical distance between a lens of the imaging module and a surface of the region to be detected of the basin insulator is 0.5m. In some examples, the vertical distance between the radiation port of the heating module and the surface of the area to be detected of the basin insulator is 0.5m. In some examples, an angle between a first line between a lens of the imaging module and a surface of the region to be detected of the basin-type insulator and a second line between a radiation port of the heating module and the surface of the region to be detected of the basin-type insulator is 20-25 °. In some examples, the image processing module is further to: Respectively calculating the temperature difference between each pixel point of each image of the temperature field distribution image sequence and each pixel point corresponding to the reference temperature field distribution image to obtain a plurality of difference values; Respectively judging whether the difference values are larger than a preset threshold value, if so, determining that the corresponding pixel points are metal particles; And determining the position of the metal particles according to the coordinates of the pixel points. In some examples, the imaging module is a thermal infrared imager. In some examples, the heating module is a microwave heater. In some examples, the image processing module is a host computer. In some examples, the control module includes a feedback unit, a control unit, a power adjustment unit. In a second aspect, the present application provides a metal particle detection method based on the metal particle detection apparatus disclosed in the first aspect, comprising th