Direct-current equipment partial discharge development and positioning method and device and electronic equipment

Abstract

The invention provides a direct-current equipment partial discharge development and positioning method and device and electronic equipment, and the method comprises the steps: collecting an ultraviolet video sequence of a partial discharge region of detected direct-current equipment; generating an ultraviolet light spot occurrence probability graph based on the ultraviolet video sequence; and carrying out discharge source positioning and development trend analysis on the tested direct current equipment based on the statistical characteristics and the spatial form of the ultraviolet light spot occurrence probability graph to obtain an analysis result. According to the invention, the dynamic and visual monitoring of the whole process of'start-development-pre-breakdown 'of partial discharge is realized, the interference of random noise is effectively filtered out, the detection result has more statistical significance and reliability, and the problems of poor sensitivity and precision in the prior art are solved.

Description

Technical Field

[0001] This invention relates to the field of electrical equipment fault diagnosis technology, and in particular to a method, device and electronic equipment for the development and location of partial discharge in DC equipment. Background Technology

[0002] High-voltage direct current (HVDC) transmission technology plays a crucial role in long-distance, high-capacity power transmission and new energy grid integration. The reliability of DC equipment, such as HVDC converter stations, is paramount, and partial discharge (PD) is a major early sign of insulation degradation. Compared to AC conditions, partial discharge under DC conditions is more complex, involving space charge accumulation and polarity effects, and its development is more random and dynamic. Currently, ultraviolet (UV) imaging technology, as a non-contact, visual optical detection method, shows potential in partial discharge detection. However, bottlenecks remain when applying it to DC equipment monitoring. There is a lack of effective monitoring of the entire process of discharge development: existing methods are mostly static or single-point localization, which makes it difficult to capture and quantify the dynamic evolution characteristics of partial discharge from corona initiation, stream development to pre-breakdown.

[0003] Insufficient sensitivity in initial discharge detection: In the initial stage of corona discharge, ultraviolet photon emission is sparse and random, with an extremely low signal-to-noise ratio. Traditional processing methods based on fixed thresholds and single-frame images are difficult to achieve effective identification and early warning.

[0004] There is a lack of analytical models for the characteristics of DC discharge: In DC discharge, the ultraviolet photon count exhibits a non-monotonic "bell-shaped" relationship with voltage, and the spatial distribution of the light spot has significant probabilistic characteristics. Existing methods fail to fully utilize these probabilistic statistical features to identify discharge modes and development stages.

[0005] There is currently no effective solution to the problems of poor sensitivity and accuracy in existing related technologies. Summary of the Invention

[0006] This invention provides a method, device, and electronic equipment for the development and location of partial discharge in DC equipment, which solves the defects of poor sensitivity and accuracy in existing related technologies, and realizes effective identification, tracking, and location of DC partial discharge throughout its entire life cycle from "emergence" and "development" to "critical".

[0007] In a first aspect, the present invention provides a method for the development and location of partial discharge in DC equipment, comprising: Acquire ultraviolet video sequences of the partial discharge region of the DC equipment under test; A probability map of ultraviolet spot occurrence is generated based on the ultraviolet video sequence; Based on the statistical characteristics and spatial morphology of the ultraviolet spot occurrence probability map, the discharge source location and development trend analysis of the tested DC equipment are performed, and the analysis results are obtained.

[0008] According to the present invention, a method for the development and location of partial discharge in DC equipment is provided, which involves acquiring an ultraviolet video sequence of the partial discharge region of the DC equipment under test, including: Determine the corona initiation voltage and pre-breakdown voltage of the DC device under test; The ultraviolet video sequence is formed by gradually increasing the corona initiation voltage to the pre-breakdown voltage and recording a specific duration of ultraviolet video at each voltage point.

[0009] According to the present invention, a method for partial discharge development and localization of DC equipment generates an ultraviolet spot occurrence probability map based on the ultraviolet video sequence, including: For each frame of the ultraviolet video sequence, color space conversion, threshold segmentation, and morphological filtering are performed to obtain a binary mask image of each frame. The binary mask images of all frames are superimposed along the time dimension to obtain the cumulative image; Obtain the total number of frames in the ultraviolet video sequence, and determine the probability map of ultraviolet spot occurrence based on the quotient of the accumulated map and the total number of frames.

[0010] According to the method for partial discharge development and localization of DC equipment provided by the present invention, when performing threshold segmentation on each frame of the ultraviolet video sequence, a threshold range is set based on the HSV color space.

[0011] According to the present invention, a method for the development and location of partial discharge in DC equipment is provided, wherein the threshold range is: the hue H component is between 60° and 160°, the saturation S component is not less than 0.25, and the brightness V component is not less than 0.15.

[0012] According to the present invention, a method for partial discharge development and localization of DC equipment, based on the quotient of the accumulated map and the total number of frames, determines the probability map of the occurrence of the ultraviolet spot, including: The quotient of the accumulated image and the total number of frames is used as the probability of the ultraviolet spot occurrence, and an ultraviolet spot occurrence probability map is generated.

[0013] According to the present invention, a method for partial discharge development and location of DC equipment is provided. Based on the statistical characteristics and spatial morphology of the probability map of ultraviolet spot occurrence, the method performs discharge source location and development trend analysis on the DC equipment under test, and obtains analysis results, including: When the overall probability level of the probability map is lower than the first threshold, the probability map is segmented using a low probability threshold, and the region with a probability value higher than the low probability threshold is determined as the initial discharge source. When a region with a probability value higher than the high probability threshold appears in the probability graph, it is determined to be in the discharge development stage. The high probability region is identified as the core region of the discharge source, and the morphological and area evolution of the core region of the discharge source is analyzed to quantify the discharge development trend. When the probability graph shows a distribution pattern where the high-probability region is stable or shrinking while the area of ​​the medium-probability region is significantly expanding, it is determined to be in the pre-breakdown stage.

[0014] According to the present invention, a method for the development and location of partial discharge in DC equipment quantifies the discharge trend, including: The growth rate of the area of ​​the high-probability region with voltage was monitored, and the formation and fusion process of the double-spherical probability region was observed.

[0015] Secondly, the present invention also provides a device for detecting and locating partial discharge in DC equipment, comprising: The acquisition module is used to acquire ultraviolet video sequences of the partial discharge region of the DC equipment under test; The processing module is used to generate an ultraviolet spot occurrence probability map based on the ultraviolet video sequence; The detection module is used to perform power supply location and development trend analysis on the tested DC equipment based on the statistical characteristics and spatial morphology of the ultraviolet spot occurrence probability map, and obtain the analysis results.

[0016] Thirdly, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method for partial discharge development and location of DC equipment as described in the first aspect above.

[0017] Fourthly, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for partial discharge development and location of DC equipment as described in the first aspect above.

[0018] Fifthly, the present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the method for partial discharge development and location of DC equipment as described in the first aspect above.

[0019] Compared with the prior art, the present invention has the following beneficial effects: The method for partial discharge development and location in DC equipment provided by this invention extends the focus of ultraviolet imaging analysis from a single "spatial location" to "identification of the development process in the temporal dimension," enabling dynamic and visual monitoring of the entire process of partial discharge from "initiation to development to pre-breakdown." Furthermore, by transforming random, sparse single-frame photon events into a stable, continuous probability distribution map, the interference of random noise is effectively filtered out, making the detection results more statistically significant and reliable, thus solving the problems of poor sensitivity and accuracy in existing related technologies. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a flowchart of the method for the development and location of partial discharge in DC equipment provided by the present invention; Figure 2 This is a schematic diagram illustrating the process of partial discharge development and location in a DC device according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the experimental platform for data acquisition in an embodiment of the present invention; Figure 4 This is a schematic diagram of the ultraviolet spot segmentation and binarization process in an embodiment of the present invention; Figure 5 This is a schematic diagram illustrating the principle of generating the probability map of ultraviolet spot occurrence in an embodiment of the present invention; Figure 6 This is a schematic diagram illustrating the evolution characteristics of the probability map under different voltages in an embodiment of the present invention; Figure 7 This is a structural block diagram of the DC equipment partial discharge development and positioning device provided by the present invention; Figure 8 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0023] This invention provides a method for the development and location of partial discharge in DC equipment. Figure 1 This is a flowchart of the method for the development and location of partial discharge in DC equipment provided by the present invention, such as... Figure 1 As shown, the method includes the following steps: Step S101: Acquire ultraviolet video sequences of the partial discharge region of the DC device under test; Step S102: Generate an ultraviolet spot occurrence probability map based on the ultraviolet video sequence; Step S103: Based on the statistical characteristics and spatial morphology of the probability map of ultraviolet spot occurrence, the discharge source location and development trend analysis of the DC equipment under test are performed to obtain the analysis results.

[0024] In this method, firstly, an ultraviolet video sequence of the partial discharge area of ​​the DC device under test is acquired. Then, the ultraviolet video sequence is processed to generate an ultraviolet spot occurrence probability map P(x,y), where P(x,y) represents the probability of an ultraviolet spot appearing at position (x,y). Finally, based on the statistical characteristics and spatial morphology of the ultraviolet spot occurrence probability map P(x,y), the development stage of the partial discharge is identified, and different probability thresholds are used for different development stages to locate the discharge source and analyze its development trend, yielding the analysis results. This process extends the focus of ultraviolet imaging analysis from a single "spatial location" to "development process identification in the time dimension," achieving dynamic and visual monitoring of the entire process of partial discharge from "initiation to development to pre-breakdown." Furthermore, by transforming random, sparse single-frame photon events into a stable, continuous probability distribution map, the interference of random noise is effectively filtered out, making the detection results more statistically significant and reliable, thus solving the problems of poor sensitivity and accuracy in existing related technologies.

[0025] The above method is further described below using specific examples in a laboratory environment. Figure 2 This is a schematic diagram illustrating the process of partial discharge development and localization in a DC device according to an embodiment of the present invention, as shown below. Figure 2 As shown: In some embodiments, step S101, acquiring an ultraviolet video sequence of the partial discharge region of the DC device under test, includes: determining the corona initiation voltage and pre-breakdown voltage of the DC device under test; gradually increasing the corona initiation voltage value to the pre-breakdown voltage, and recording an ultraviolet video of a specific duration at each voltage point to form an ultraviolet video sequence.

[0026] For example, Figure 3 This is a schematic diagram of the experimental platform for data acquisition in an embodiment of the present invention, as shown below. Figure 3As shown, a needle-to-needle electrode discharge model was photographed using an ultraviolet imager. Starting from 4050V (corona initiation), the voltage was gradually increased to 5100V (pre-breakdown). At each voltage point, a 2-minute ultraviolet video was recorded.

[0027] In order to transform qualitative, random photon emission into quantitative, stable probability distribution features, in some embodiments, step S102, generating an ultraviolet spot occurrence probability map based on the ultraviolet video sequence, includes: performing color space conversion, threshold segmentation, and morphological filtering on each frame of the ultraviolet video sequence to obtain a binary mask image of each frame; superimposing the binary mask images of all frames along the time dimension to obtain an accumulated image; obtaining the total number of frames in the ultraviolet video sequence, and determining the ultraviolet spot occurrence probability map based on the quotient of the accumulated image and the total number of frames.

[0028] Furthermore, when performing threshold segmentation on each frame of the ultraviolet video sequence, a threshold range is set based on the HSV color space. Specifically, the threshold range is: hue (H component) between 60° and 160°, saturation (S component) not less than 0.25, and lightness (V component) not less than 0.15.

[0029] Preferably, the probability map of ultraviolet spot occurrence is determined based on the quotient of the accumulated image and the total number of frames, including: using the quotient of the accumulated image and the total number of frames as the probability of ultraviolet spot occurrence, and generating the probability map of ultraviolet spot occurrence. The specific formula is as follows: P(x,y) = Count(x,y) / N_frames Where P(x,y) represents the probability of an ultraviolet spot appearing at position (x,y), Count(x,y) represents the cumulative image, and N_frames represents the total number of frames.

[0030] For example, such as Figure 4 and Figure 5 As shown, Figure 4 This is a schematic diagram of the ultraviolet spot segmentation and binarization process in an embodiment of the present invention. Figure 5 This is a schematic diagram illustrating the principle of generating the ultraviolet spot occurrence probability map in this embodiment of the invention. In the MATLAB environment, a script is written to automatically process the video sequence. For each frame, an rgb2hsv conversion is performed; a binary mask image is created based on a threshold (H: 60-160, S≥0.25, V≥0.15), and morphological opening operations are performed. For each video, all binary mask images are summed to obtain a cumulative image Count(x,y), and then P(x,y) = Count(x,y) / N_frames is calculated to generate the ultraviolet spot occurrence probability map corresponding to that video.

[0031] In some of these embodiments, in step S103, based on the statistical characteristics and spatial morphology of the ultraviolet spot appearance probability map, the discharge source of the DC device under test is located and the development trend is analyzed to obtain an analysis result, including: when the overall probability level of the probability map is lower than the first threshold, the probability map is segmented using a low probability threshold, and the area with a probability value higher than the low probability threshold is determined as the initial discharge source; when there is an area with a probability value higher than the high probability threshold in the probability map, it is determined as the discharge development stage, the high probability area is determined as the core area of the discharge source, and the morphology and area evolution of the core area of the discharge source are analyzed to quantify the discharge development trend; when the distribution characteristics show that the range of the high probability area is stable or shrinking while the area of the medium probability area significantly expands, it is determined as the pre-breakdown stage.

[0032] In this embodiment, quantifying the discharge development trend includes: monitoring the growth rate of the area of the high probability area with respect to voltage, and observing the formation and fusion process of the double-spherical probability area.

[0033] The key of this embodiment is to associate the static characteristics of the ultraviolet spot appearance probability map with the dynamic physical process of discharge, and adopt a probability threshold-based strategy to achieve full-process monitoring, specifically as follows: Sensitive identification in the corona inception stage (corresponding to the "germination period"): Identification characteristics: The overall probability level of the ultraviolet spot appearance probability map P(x,y) is extremely low, and the maximum value is usually lower than 10%, without obvious morphological structure.

[0034] Location strategy: The ultraviolet spot appearance probability map is segmented using a low probability threshold P_low (preferably 0.01). The area with a probability value higher than P_low is identified as the potential initial discharge source, so as to achieve sensitive identification of the discharge germination state from random noise.

[0035] Trend tracking and source area location in the discharge development stage (corresponding to the "development period"): Identification characteristics: There are clearly shaped high probability areas (such as P>0.8) and medium probability areas (such as 0.2<P ≤ 0.8) in the ultraviolet spot appearance probability map. The evolution of its characteristics directly reflects the changes in discharge intensity, stability, and mode.

[0036] Location and trend analysis strategy: The area with a probability value higher than the high probability threshold P_high (preferably 0.8) is determined as the core area of the discharge source, and its centroid or spatial concentration point is the exact location of the discharge source. At the same time, by analyzing the area, morphology (such as the formation and fusion of the double-spherical structure) of the high probability area and its evolution with voltage, the tracking of the discharge development trend and pattern recognition are achieved.

[0037] Pattern recognition in the pre-breakdown stage (corresponding to the "critical period"): Recognition feature: In the ultraviolet spot appearance probability map, the range of the power source core area (P > P_high) is relatively stable or shrinking, while the area of the medium probability area (P_mid < P ≤ P_high, for example, 0.2 < P ≤ 0.8) expands significantly, forming a distribution feature of "core shrinking - periphery diffusion".

[0038] Recognition strategy: The appearance of this feature can be used as a warning indicator for the transition of the discharge mode and the system entering the pre-breakdown critical state.

[0039] Exemplarily, as Figure 6 shown, Figure 6 is a schematic diagram showing the evolution characteristics of the probability map at different voltages in the embodiment of the present invention.

[0040] Case A: Voltage 4050V (corona inception stage) Recognition: The ultraviolet spot appearance probability map as a whole shows a low probability level (P_max < 0.05) and has no obvious structure.

[0041] Location: Set the probability threshold P_low to 0.01. Several tiny areas with a probability higher than 0.01 and pixel point size appear at the tips of the left and right electrodes. This is the initial power source, achieving sensitive recognition of the "germination period" of the discharge.

[0042] Case B: Voltage 4950V (discharge development stage - peak period) Recognition and location: In the ultraviolet spot appearance probability map, a clear double-spherical high probability area (P > 0.8) can be seen. The area of the left sphere (anode) is larger than that of the right sphere, reflecting the polarity effect. The core position of this high probability area is the accurate position of the power source. At the same time, this morphology and area indicate that the discharge is in an active development period.

[0043] Case C: Voltage 5100V (pre-breakdown stage) Recognition: In the ultraviolet spot appearance probability map, the range of the high probability area (P > 0.8) shrinks compared to 4950V, but the medium probability area (0.2 < P ≤ 0.8) expands significantly. This feature of "core shrinking - periphery diffusion" is the key indicator for realizing the "critical" state warning.

[0044] Through this embodiment, it can be verified that this method can systematically complete the recognition and location of the whole process of DC partial discharge from inception, development to pre-breakdown.

[0045] In summary, this method enables monitoring of the entire lifecycle of discharge: for the first time, it extends the focus of ultraviolet imaging analysis from a single "spatial location" to "identification of the development process in the temporal dimension," achieving dynamic and visual monitoring of the entire process of partial discharge from "initiation to development to pre-breakdown." This method is based on a hierarchical analysis strategy using probabilistic maps: by setting different probability thresholds, it achieves different depths of analysis on the same set of data, enabling high-sensitivity capture of initial signals, precise location of the discharge source core, and identification of critical states. The method is simple and efficient. Furthermore, this method introduces a probabilistic statistical model, improving its anti-interference capability and reliability: by transforming random, sparse single-frame photon events into a stable, continuous probability distribution map, it effectively filters out random noise interference, making the detection results more statistically significant and reliable. In addition, the probability map generated by this method and its evolution characteristics provide intuitive and quantifiable experimental evidence for observing and studying physical processes such as polarity effects, space charge influence, and discharge mode transitions in DC discharge.

[0046] This invention provides a device for the development and location of partial discharge in DC equipment. The device for the development and location of partial discharge in DC equipment provided by this invention is described below. The device for the development and location of partial discharge in DC equipment described below can be referred to in correspondence with the method for the development and location of partial discharge in DC equipment described above. Figure 7 This is a structural block diagram of the DC equipment partial discharge development and location device provided by the present invention, as shown in the figure. Figure 7 As shown, the device includes: Acquisition module 701 is used to acquire ultraviolet video sequences of the partial discharge region of the DC equipment under test; Processing module 702 is used to generate an ultraviolet spot occurrence probability map based on the ultraviolet video sequence; The detection module 703 is used to locate and analyze the development trend of the discharge source of the DC equipment under test based on the statistical characteristics and spatial morphology of the probability map of the occurrence of ultraviolet light spots, and obtain the analysis results.

[0047] In operation, this device first acquires an ultraviolet video sequence of the partial discharge area of ​​the DC equipment under test using the acquisition module 701. Then, the processing module 702 processes the ultraviolet video sequence to generate an ultraviolet spot occurrence probability map P(x,y), where P(x,y) represents the probability of an ultraviolet spot appearing at position (x,y). Finally, the detection module 703 identifies the development stage of the partial discharge based on the statistical characteristics and spatial morphology of the ultraviolet spot occurrence probability map P(x,y), and uses different probability thresholds for different development stages to locate the discharge source and analyze its development trend, obtaining the analysis results. This process extends the focus of ultraviolet imaging analysis from a single "spatial location" to "development process identification in the time dimension," achieving dynamic and visual monitoring of the entire process of partial discharge from "initiation to development to pre-breakdown." Furthermore, by transforming random, sparse single-frame photon events into a stable, continuous probability distribution map, the interference of random noise is effectively filtered out, making the detection results more statistically significant and reliable, thus solving the problems of poor sensitivity and accuracy in existing related technologies.

[0048] Figure 8 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 8 As shown, the electronic device may include: a processor 801, a communication interface 802, a memory 803, and a communication bus 804, wherein the processor 801, the communication interface 802, and the memory 803 communicate with each other via the communication bus 804. The processor 801 can call logical instructions in the memory 803 to execute a method for the development and location of partial discharge in DC equipment, the method including: Acquire ultraviolet video sequences of the partial discharge region of the DC equipment under test; Generate a probability map of ultraviolet spot occurrence based on ultraviolet video sequences; Based on the statistical characteristics and spatial morphology of the probability map of ultraviolet light spot occurrence, the location and development trend of the discharge source of the DC equipment under test are analyzed, and the analysis results are obtained.

[0049] Furthermore, the logical instructions in the aforementioned memory 803 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0050] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to execute the DC device partial discharge development and location method provided by the above methods, the method including: Acquire ultraviolet video sequences of the partial discharge region of the DC equipment under test; Generate a probability map of ultraviolet spot occurrence based on ultraviolet video sequences; Based on the statistical characteristics and spatial morphology of the probability map of ultraviolet light spot occurrence, the location and development trend of the discharge source of the DC equipment under test are analyzed, and the analysis results are obtained.

[0051] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the DC device partial discharge development and location method provided by the above methods, the method comprising: Acquire ultraviolet video sequences of the partial discharge region of the DC equipment under test; Generate a probability map of ultraviolet spot occurrence based on ultraviolet video sequences; Based on the statistical characteristics and spatial morphology of the probability map of ultraviolet light spot occurrence, the location and development trend of the discharge source of the DC equipment under test are analyzed, and the analysis results are obtained.

[0052] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0053] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for the development and location of partial discharge in DC equipment, characterized in that, include: Acquire ultraviolet video sequences of the partial discharge region of the DC equipment under test; A probability map of ultraviolet spot occurrence is generated based on the ultraviolet video sequence; Based on the statistical characteristics and spatial morphology of the ultraviolet spot occurrence probability map, the discharge source location and development trend analysis of the tested DC equipment are performed, and the analysis results are obtained.

2. The method for partial discharge development and location in DC equipment according to claim 1, characterized in that, Acquire ultraviolet video sequences of the partial discharge region of the DC equipment under test, including: Determine the corona initiation voltage and pre-breakdown voltage of the DC device under test; The ultraviolet video sequence is formed by gradually increasing the corona initiation voltage to the pre-breakdown voltage and recording a specific duration of ultraviolet video at each voltage point.

3. The method for partial discharge development and location in DC equipment according to claim 1, characterized in that, Generate an ultraviolet spot occurrence probability map based on the ultraviolet video sequence, including: For each frame of the ultraviolet video sequence, color space conversion, threshold segmentation, and morphological filtering are performed to obtain a binary mask image of each frame. The binary mask images of all frames are superimposed along the time dimension to obtain the cumulative image; Obtain the total number of frames in the ultraviolet video sequence, and determine the probability map of ultraviolet spot occurrence based on the quotient of the accumulated map and the total number of frames.

4. The method for partial discharge development and location in DC equipment according to claim 3, characterized in that, When performing threshold segmentation on each frame of the ultraviolet video sequence, the threshold range is set based on the HSV color space.

5. The method for partial discharge development and location in DC equipment according to claim 4, characterized in that, The threshold range is as follows: the hue (H) component is between 60° and 160°, the saturation (S) component is not less than 0.25, and the brightness (V) component is not less than 0.

15.

6. The method for partial discharge development and location in DC equipment according to claim 1, characterized in that, Based on the quotient of the accumulated graph and the total number of frames, the probability graph of the occurrence of the ultraviolet spot is determined, including: The quotient of the accumulated image and the total number of frames is used as the probability of the ultraviolet spot occurrence, and an ultraviolet spot occurrence probability map is generated.

7. The method for partial discharge development and location in DC equipment according to claim 1, characterized in that, Based on the statistical characteristics and spatial morphology of the ultraviolet spot occurrence probability map, the discharge source location and development trend analysis of the tested DC equipment are performed, and the analysis results are as follows: When the overall probability level of the probability map is lower than the first threshold, the probability map is segmented using a low probability threshold, and the region with a probability value higher than the low probability threshold is determined as the initial discharge source. When a region with a probability value higher than the high probability threshold appears in the probability graph, it is determined to be in the discharge development stage. The high probability region is identified as the core region of the discharge source, and the morphological and area evolution of the core region of the discharge source is analyzed to quantify the discharge development trend. When the probability graph shows a distribution pattern where the high-probability region is stable or shrinking while the area of ​​the medium-probability region is significantly expanding, it is determined to be in the pre-breakdown stage.

8. The method for partial discharge development and location in DC equipment according to claim 7, characterized in that, Quantitative discharge trends include: The growth rate of the area of ​​the high-probability region with voltage was monitored, and the formation and fusion process of the double-spherical probability region was observed.

9. A device for detecting and locating partial discharge in DC equipment, characterized in that, include: The acquisition module is used to acquire ultraviolet video sequences of the partial discharge region of the DC equipment under test; The processing module is used to generate an ultraviolet spot occurrence probability map based on the ultraviolet video sequence; The detection module is used to perform power supply location and development trend analysis on the tested DC equipment based on the statistical characteristics and spatial morphology of the ultraviolet spot occurrence probability map, and obtain the analysis results.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the method for partial discharge development and location of DC equipment as described in any one of claims 1 to 8.

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