CN104297645A - Electrical equipment external discharging ultraviolet detection and analysis method and device - Google Patents

Abstract

The invention relates to an ultraviolet detection and analysis method and device for external discharge of electrical equipment. It is characterized in that it includes the following steps: a, firstly, using an ultraviolet imager to conduct non-contact detection on the external discharge of electrical equipment, and forming an ultraviolet discharge image; b, secondly, performing grayscale processing on the obtained ultraviolet discharge image, and converting the color The picture is converted into a binary grayscale image; c, then, perform mathematical morphology filtering on the binary grayscale image to obtain a clear binary grayscale spectrum of ultraviolet light spots; d, use the Fourier descriptor algorithm to filter the clear Quantitatively compare the binary grayscale image of the ultraviolet spot with the images in the preset typical discharge ultraviolet binary image library; e, according to the comparison result, the judgment result of the external discharge type of the equipment is given. The technical scheme of the invention can realize the judgment of the equipment discharge type in the ultraviolet detection of electrical equipment, and improve the scientificity, accuracy and reliability of on-site ultraviolet detection and diagnosis.

Description

Method and device for ultraviolet detection and analysis of external discharge of electrical equipment

technical field

The invention relates to an ultraviolet detection and analysis method and device for external discharge of electrical equipment.

Background technique

Electrical equipment such as insulators and bushings will generate external discharges during operation due to surface contamination, condensation and burrs. The external discharge of electrical equipment will corrode the insulation of the equipment, and long-term discharge will cause insulation deterioration and cause accidents. Ultraviolet detection is a non-contact detection method for external discharge of equipment developed in recent years. It has the characteristics of good real-time, non-contact, and high detection sensitivity, and has been welcomed by the majority of field workers. Especially for equipment such as insulators on the line, due to their high altitude, other methods except for ultraviolet imaging cannot effectively detect their discharge conditions. The current ultraviolet detection usually uses a sun-blind detection device, and the detection is carried out in the ultraviolet section, which can avoid the influence of sunlight and greatly improve the scope of application of on-site detection.

In the on-site UV detection, the analysis of the results is related to the subsequent processing measures. Currently, the UV detection results are presented in the form of UV images, and then assisted by indicators such as the number of UV photons, and further results such as discharge types cannot be given. Therefore, how to conduct further analysis conveniently and quickly according to the on-site test results, and give the discharge type is a key problem that needs to be solved at present.

Contents of the invention

One of the purposes of the present invention is to provide an ultraviolet detection and analysis method for the external discharge of electrical equipment, which can use ultraviolet image processing and quantitative comparison with the preset map library to accurately give the judgment of the discharge type;

The second object of the present invention is to provide a device for realizing the above method.

An ultraviolet detection and analysis method for external discharge of electrical equipment, which is particularly characterized in that it includes the following steps:

a, first, use the ultraviolet imager to conduct non-contact detection of the external discharge of the electrical equipment, and form an ultraviolet discharge image;

b, secondly, grayscale processing is performed on the obtained ultraviolet discharge image, and the color picture is converted into a binary grayscale image;

c, then, perform mathematical morphological filtering on the binary grayscale image to obtain a clear binary grayscale spectrum of ultraviolet light spots;

d, Using the Fourier descriptor algorithm to quantify and compare the filtered clear binary gray image of ultraviolet spots with the images in the preset typical discharge ultraviolet binary image library one by one;

e. According to the comparison result, the judgment result of the external discharge type of the equipment is given.

The electrical equipment in step a refers to insulators or bushings.

In step b, when converting a color image into a binary grayscale image, the original image is first digitized to form an image digital matrix, and then the white area in the matrix is assigned a value of "1", and the rest of the image is assigned a value of "0" to form a binary image. Value grayscale image.

In step d, the binary grayscale image of the clear ultraviolet spot is quantitatively compared with the typical discharge type image in the preset atlas library one by one to obtain the calculated value of the quantitative similarity between the two. The higher the degree of similarity.

The preset image library in step d includes typical binary grayscale images of equipment pollution discharge, condensation discharge, and glitch discharge.

An ultraviolet detection and analysis device for external discharge of electrical equipment, which is special in that it includes a detection module for detecting the ultraviolet spectrum of electrical equipment, and a conversion module for converting the detected ultraviolet spectrum into a clear binary grayscale image , the comparison module used to compare the clear binary grayscale image with the preset map library to obtain the quantitative comparison result, the output module used to output the analysis result according to the comparison result, the above detection module, conversion module, comparison module and output Modules are connected sequentially.

It has been proven through trials that the technical scheme of the invention can realize the judgment of the equipment discharge type in the ultraviolet detection of electrical equipment, and improve the scientificity, accuracy and reliability of the on-site ultraviolet detection and diagnosis.

Description of drawings

Accompanying drawing 1 is the schematic flow sheet of electric equipment external discharge ultraviolet detection and analysis method of the present invention;

Accompanying drawing 2 is the schematic diagram of the ultraviolet detection and analysis device for the external discharge of electrical equipment of the present invention.

Detailed ways

As shown in Figure 1, the present invention provides a kind of electric equipment external discharge ultraviolet detection and analysis method, comprises the following steps:

a, first, use the ultraviolet imager to conduct non-contact detection of the external discharge of the electrical equipment, and form an ultraviolet discharge image;

b, secondly, grayscale processing is performed on the obtained ultraviolet discharge image, and the color picture is converted into a binary grayscale image;

c, then, perform mathematical morphological filtering on the binary grayscale image to obtain a clear binary grayscale spectrum of ultraviolet light spots;

d, Using the Fourier descriptor algorithm to quantify and compare the filtered clear binary gray image of ultraviolet spots with the images in the preset typical discharge ultraviolet binary image library one by one;

e. According to the comparison result, the judgment result of the external discharge type of the equipment is given.

The electrical equipment in step a refers to insulators or bushings. In step b, when converting a color image into a binary grayscale image, the original image is first digitized to form an image digital matrix, and then the white area in the matrix is assigned a value of "1", and the rest of the image is assigned a value of "0" to form a binary image. Value grayscale image. In step d, the binary grayscale image of the clear ultraviolet spot is quantitatively compared with the typical discharge type image in the preset atlas library one by one to obtain the calculated value of the quantitative similarity between the two. The higher the degree of similarity. The preset image library in step d includes typical binary grayscale images of equipment pollution discharge, condensation discharge, and glitch discharge.

As shown in Figure 2, the present invention also provides an ultraviolet detection and analysis device for the external discharge of electrical equipment, including a detection module for detecting the ultraviolet spectrum of the electrical equipment, for converting the detected ultraviolet spectrum into a clear binary gray The conversion module of the high-degree image is used to compare the clear binary grayscale image with the preset map library to obtain the comparison module of the quantitative comparison result, and the output module is used to output the analysis result according to the comparison result. The above-mentioned detection module and conversion module , the comparison module and the output module are connected in sequence. The above-mentioned modules may be functional modules implemented by software or hardware modules implemented by a microprocessor combined with software.

The invention provides a method and device for detecting and analyzing ultraviolet rays from the external discharge of electrical equipment. The method firstly converts the detected ultraviolet images of electrical equipment into gray scales, and converts the color pictures into binary grayscale images; The image is filtered by mathematical morphology to obtain a clear binary grayscale spectrum of ultraviolet spots; the Fourier descriptor algorithm is used to quantitatively compare the clear binary grayscale spectrum with the preset spectrum library; the external discharge of the device is carried out according to the comparison results type of judgment.

Example 1:

The technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

Fig. 1 shows the schematic flow chart of the ultraviolet detection and analysis method for the external discharge of electrical equipment of the present invention, and the method comprises the following steps:

Step 1: Use the ultraviolet imager to conduct ultraviolet detection on electrical equipment such as insulators and bushings, and obtain the original image of ultraviolet discharge. The original image is a color image including discharge signals and interference signals.

Step 2: Perform grayscale processing on the color original image, and convert the color image into a binary grayscale image.

Specifically, the original picture is first digitized to form an image digital matrix f(x, y), and then the white area in the matrix is assigned "1" and the rest is assigned "0" to form a binary grayscale image.

Step 3: Perform mathematical morphological filtering on the binary grayscale image to obtain a clear binary grayscale spectrum of ultraviolet light spots. Image mathematical morphological filtering is a commonly used image denoising algorithm, and it is an existing mature algorithm, so it will not be repeated here.

Step 4: Quantitatively compare the filtered clear binary grayscale image with the images in the preset image library. The preset image library contains typical clear binary grayscale images of different typical discharge types such as pollution discharge, condensation discharge and glitch discharge of the equipment. The Fourier descriptor algorithm is used to sequentially calculate the similarity calculation value between the ultraviolet clear binary grayscale image to be analyzed and the typical discharge type ultraviolet image in the preset spectral library. The Fourier descriptor algorithm is a mature algorithm for comparing image similarity, and will not be described here.

Step 5: Outputting the discharge type of the preset image with the smallest calculated similarity value, which is the discharge type of the ultraviolet image to be detected.

According to an embodiment of the present invention, an ultraviolet detection and analysis device for external discharge of electrical equipment is provided.

Fig. 2 is a schematic diagram of an ultraviolet detection and analysis device for external discharge of electrical equipment according to an embodiment of the present invention.

As shown in Figure 2, the device includes: a detection module, a conversion module, a comparison module, and a judgment module.

Among them, the detection module is used for ultraviolet imaging detection of the external discharge of electrical equipment; the conversion module is used to convert the detected color image into a clear binary grayscale image; the comparison module is used to compare the clear binary grayscale image with the preset map library The clear binary grayscale images of the typical discharge types are quantitatively compared; the output module is used to output the judgment results according to the comparison results.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any changes or substitutions that can be easily imagined by those skilled in the art within the technical scope disclosed in the present invention, All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (6)

1. an electric equipment external discharge ultraviolet detection and analysis method, is characterized in that, comprises the steps: a, first, use the ultraviolet imager to conduct non-contact detection of the external discharge of the electrical equipment, and form an ultraviolet discharge image; b, secondly, grayscale processing is performed on the obtained ultraviolet discharge image, and the color picture is converted into a binary grayscale image; c, then, perform mathematical morphological filtering on the binary grayscale image to obtain a clear binary grayscale spectrum of ultraviolet light spots; d, Using the Fourier descriptor algorithm to quantify and compare the filtered clear binary gray image of ultraviolet spots with the images in the preset typical discharge ultraviolet binary image library one by one; e. According to the comparison result, the judgment result of the external discharge type of the equipment is given. 2. The ultraviolet detection and analysis method for external discharge of electrical equipment as claimed in claim 1, wherein the electrical equipment in step a refers to insulators or bushings. 3. the electric equipment external discharge ultraviolet detection and analysis method as claimed in claim 1, it is characterized in that: when color picture is converted into binary gray scale picture in step b, at first original picture digitization is formed image digital matrix, then Assign "1" to the white area in the matrix, and "0" to the rest to form a binary grayscale image. 4. The method for detecting and analyzing ultraviolet light from the external discharge of electrical equipment according to claim 1, wherein in step d, the obtained clear ultraviolet spot binary grayscale image and the typical discharge type image in the preset spectral library are specifically combined Quantitative comparisons are carried out one by one to obtain the calculated value of the quantitative similarity between the two. The smaller the value is, the higher the similarity between the two is determined. 5. The method for ultraviolet detection and analysis of external discharge of electrical equipment according to claim 1, wherein the preset image library in step d includes typical binary grayscale images of equipment pollution discharge, condensation discharge, and glitch discharge. 6. An ultraviolet detection and analysis device for external discharge of electrical equipment, characterized in that: it includes a detection module for performing ultraviolet spectrum detection on electrical equipment, and a conversion module for converting the detected ultraviolet spectrum into a clear binary grayscale image , the comparison module used to compare the clear binary grayscale image with the preset map library to obtain the quantitative comparison result, the output module used to output the analysis result according to the comparison result, the above detection module, conversion module, comparison module and output Modules are connected sequentially.