Abnormal positioning analysis method, device, system and equipment for voltage withstanding test

Abstract

The invention relates to a voltage withstanding test abnormity positioning analysis method, device, system and equipment. The method comprises the following steps: acquiring a sound signal and a visible light image of an area where test equipment is located under the condition that the voltage of the test equipment is increased and maintained at a preset test high voltage; identifying whether the sound signal has an abnormal signal, and obtaining a first discharge detection result; comparing the visible light image with a preset reference image, and detecting whether a glow signal exists in an area where the test equipment is located to obtain an image comparison result and a glow signal detection result; judging whether abnormal discharge exists or not based on the image comparison result and the glow signal detection result, and obtaining a second discharge detection result; and under the condition that the first discharge detection result and the second discharge detection result represent that abnormal discharge exists, an abnormal discharge point is positioned according to the first discharge detection result and the second discharge detection result. By adopting the method, the accuracy of abnormal discharge point positioning can be improved.

Description

Technical Field

[0001] The present application relates to the field of electrical engineering technology, and in particular to a method, device, system and equipment for locating and analyzing abnormalities in a withstand voltage test. Background Art

[0002] During the AC / DC withstand voltage test of AC / DC primary equipment such as converter transformers, connecting transformers, GIS (Gas Insulated Switchgear) / GIL (Gas Insulated Transmission Lines), and DC wall bushings in EHV and UHV converter stations, various abnormal conditions such as lead tip discharge, AC / DC booster equipment or test product discharge, and metal suspension discharge may occur during the test due to insufficient insulation distance, improper wiring, metal suspension in the near electric field, and test product defects, resulting in interruption of the test.

[0003] At present, the main method for checking abnormal discharge in the lead wire and test circuit during AC and DC withstand voltage test is to conduct manual observation by the test personnel and to identify the position by listening. This method has high requirements on the experience, technology and skill level of the test personnel. In addition, the withstand voltage test is carried out when the equipment is installed and in the operating position. During the test, the test personnel often have problems of limited senses and insufficient monitoring due to the large area and high height of the equipment itself, the space partition of the equipment, and the small test space. In the AC and DC withstand voltage test, for these instantaneous discharges or abnormal sounds, the test personnel need to reproduce the abnormality through multiple voltage boosts before they can finally find the abnormal point. Therefore, there is a problem of inaccurate location of abnormal discharge in the withstand voltage test. Summary of the invention

[0004] Based on this, it is necessary to provide a method, device, system, computer equipment, computer-readable storage medium and computer program product for locating abnormal discharge points in a withstand voltage test, which can improve the accuracy of locating abnormal discharge points in the withstand voltage test, in order to solve the above-mentioned technical problems.

[0005] In a first aspect, the present application provides a method for locating and analyzing abnormalities in a withstand voltage test, comprising:

[0006] When the voltage of the test equipment rises to and is maintained at the preset test high voltage, obtain the sound signal and visible light image of the area where the test equipment is located;

[0007] Identify whether the sound signal has an abnormal signal, and obtain a first discharge detection result;

[0008] Compare the visible light image with the preset reference image, and detect whether there is a glow signal in the area where the test equipment is located, to obtain image comparison results and glow signal detection results;

[0009] Based on the image comparison result and the glow signal detection result, determine whether there is abnormal discharge, and obtain a second discharge detection result;

[0010] When the first discharge detection result and the second discharge detection result indicate that abnormal discharge exists, the abnormal discharge point is located according to the first discharge detection result and the second discharge detection result.

[0011] In one embodiment, locating the abnormal discharge point according to the first discharge detection result and the second discharge detection result includes:

[0012] Filtering out a target first discharge detection result and a target second discharge detection result having the same abnormal discharge time from the first discharge detection result and the second discharge detection result;

[0013] If the abnormal discharge types of the target first discharge detection result and the target second discharge detection result are consistent, locating the abnormal discharge point based on the target first discharge detection result and the target second discharge detection result;

[0014] If the abnormal discharge types of the target first discharge detection result and the target second discharge detection result are inconsistent, the abnormal discharge point is located based on the target second discharge detection result.

[0015] In one embodiment, the sound signal includes an audible sound signal and an ultrasonic signal, and identifying whether the sound signal has an abnormal signal to obtain the first discharge detection result includes:

[0016] De-noising the audible sound signal and the ultrasonic signal by using a reference audible sound signal and a reference ultrasonic signal, wherein the reference audible sound signal and the reference ultrasonic signal are acquired when the voltage of the test equipment is at a preset reference voltage;

[0017] In the case where an abnormal signal exists in at least one of the audible sound signal and the ultrasonic signal after denoising, determining the abnormal discharge type of the abnormal signal based on a preset abnormal discharge signal analysis strategy;

[0018] Based on the abnormal signal, an abnormal discharge position is determined, and the first discharge detection result includes the abnormal discharge time, abnormal discharge type and abnormal discharge position of the abnormal signal.

[0019] In one embodiment, based on a preset abnormal discharge signal analysis strategy, determining the abnormal discharge type of the abnormal signal includes:

[0020] In the case where the audible sound signal and the ultrasonic signal both have steep wave signals, determining the abnormal discharge type of the abnormal signal to be gap discharge or surface discharge;

[0021] When there is no abnormal signal in the audible sound signal and there is a periodic abnormal signal in the ultrasonic signal, determining that the abnormal discharge type of the abnormal signal is corona discharge;

[0022] When there is a periodic abnormal signal in the audible sound signal and there is no abnormal signal in the ultrasonic signal, it is determined that the abnormal discharge type of the abnormal signal is suspended discharge.

[0023] In one embodiment, judging whether there is abnormal discharge based on the image comparison result and the glow signal detection result, obtaining the second discharge detection result includes:

[0024] When the glow signal detection result indicates that there is a glow signal, and the image comparison result indicates that the similarity between the visible light image and the reference image is higher than a preset similarity threshold, determining that the abnormal discharge type of the visible light image is corona discharge;

[0025] When the glow signal detection result indicates that there is no glow signal, and the image comparison result indicates that the similarity between the visible light image and the reference image is lower than a preset similarity threshold, determining that the abnormal discharge type of the visible light image is suspended discharge;

[0026] When the glow signal detection result indicates the presence of a glow signal, and the image comparison result indicates that the similarity between the visible light image and the reference image is lower than a preset similarity threshold, the abnormal discharge type of the visible light image is determined to be gap discharge or surface discharge, and the second discharge detection result includes the visible light image collected at the moment when the glow signal is detected, and the abnormal discharge type of the visible light image.

[0027] In one embodiment, the method for locating and analyzing abnormalities in a withstand voltage test further includes:

[0028] When the voltage of the test equipment is at a preset reference voltage, detecting whether there is a glow signal in the area where the test equipment is located, and obtaining a glow signal detection result;

[0029] When the glow signal detection result indicates that a glow signal exists, obtaining a target visible light image collected at the time when the glow signal is detected, and determining that the target visible light image is an abnormal image;

[0030] Generate and push warning information based on abnormal images.

[0031] In a second aspect, the present application also provides a pressure test abnormality location analysis device, comprising:

[0032] A data acquisition module, used to acquire sound signals and visible light images of the area where the test equipment is located when the voltage of the test equipment rises to and is maintained at a preset test high voltage;

[0033] A first discharge detection module, used to identify whether the sound signal has an abnormal signal and obtain a first discharge detection result;

[0034] A second discharge detection module is used to compare the visible light image with a preset reference image, and detect whether there is a glow signal in the area where the test equipment is located, to obtain an image comparison result and a glow signal detection result; based on the image comparison result and the glow signal detection result, it is determined whether there is an abnormal discharge, to obtain a second discharge detection result;

[0035] The abnormality location analysis module is used to locate the abnormal discharge point according to the first discharge detection result and the second discharge detection result when the first discharge detection result and the second discharge detection result indicate the existence of abnormal discharge.

[0036] In a third aspect, the present application also provides a withstand voltage test abnormality location analysis system, including a controller, a sound recognition system and an image recognition system, wherein the sound recognition system and the image recognition system are respectively connected to the controller in communication:

[0037] A sound recognition system is used to collect sound signals in the area where the test equipment is located when the voltage of the test equipment rises to and is maintained at a preset test high voltage, identify whether the sound signal has an abnormal signal, obtain a first discharge detection result, and send the first discharge detection result to the controller;

[0038] An image recognition system is used to collect a visible light image of the area where the test equipment is located when the voltage of the test equipment rises to and is maintained at a preset test high voltage; compare the visible light image with a preset reference image, and detect whether there is a glow signal in the area where the test equipment is located, obtain an image comparison result and a glow signal detection result, determine whether there is abnormal discharge based on the image comparison result and the glow signal detection result, obtain a second discharge detection result, and send the second discharge detection result to the controller;

[0039] The controller is used to receive a first discharge detection result and a second discharge detection result, and locate an abnormal discharge point according to the first discharge detection result and the second discharge detection result when the first discharge detection result and the second discharge detection result indicate that abnormal discharge exists.

[0040] In one of the embodiments, the sound recognition system is also used to denoise the audible sound signal and the ultrasonic signal through a reference audible sound signal and a reference ultrasonic signal, the reference audible sound signal and the reference ultrasonic signal are collected when the voltage of the test equipment is at a preset reference voltage, when there is an abnormal signal in at least one of the denoised audible sound signal and the ultrasonic signal, based on a preset abnormal discharge signal analysis strategy, the abnormal discharge type of the abnormal signal is determined, and based on the abnormal signal, the abnormal discharge position is determined, and the first discharge detection result includes the abnormal discharge time, abnormal discharge type and abnormal discharge position of the abnormal signal.

[0041] In one of the embodiments, the controller is further used to generate an abnormal discharge event report based on the first discharge detection result and the second discharge detection result when the first discharge detection result and the second discharge detection result indicate the presence of abnormal discharge, and the abnormal discharge event report includes the abnormal discharge time, the abnormal discharge type and the abnormal discharge location.

[0042] In a fourth aspect, the present application further provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps in any one of the above-mentioned embodiments of the method for locating and analyzing abnormalities in a withstand voltage test are implemented.

[0043] In a fifth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps in any one of the above-mentioned embodiments of the method for locating and analyzing abnormalities in a withstand voltage test are implemented.

[0044] In a sixth aspect, the present application further provides a computer program product, including a computer program, which, when executed by a processor, implements the steps in any one of the above-mentioned embodiments of the method for locating and analyzing abnormalities in a withstand voltage test.

[0045] The above-mentioned method, device, system, computer equipment, computer-readable storage medium and computer program product for abnormal location analysis of withstand voltage test are different from the traditional method of checking abnormal discharge in the lead and test circuit during the withstand voltage test by relying on the experience, technology, manual observation and sound identification of the test personnel. By performing image capture and comparison, glow signal detection, sound signal acquisition and abnormal signal detection on the test equipment, the abnormality in the withstand voltage test is automatically checked and located from multiple dimensions, the abnormal discharge is preliminarily located, and the first discharge detection result and the second discharge detection result are obtained. Further, according to the first discharge detection result and the second discharge detection result, the abnormal discharge in the test equipment area is determined, and the possibility of misjudgment of abnormal location is reduced, so that the abnormal discharge that occurs in a moment during the withstand voltage test can be captured, and the abnormal discharge point can be located. Compared with the method of manually checking and locating the abnormal discharge point, the accuracy of abnormal discharge location in the withstand voltage test of ultra-high and ultra-high voltage AC and DC equipment is improved. In addition, through the multi-dimensional automatic abnormality checking and positioning method, the possibility of abnormal location that needs to be reproduced by multiple boosts is reduced, and the efficiency of abnormal location is improved. Furthermore, it is helpful for test personnel to check the insulation quality of test equipment and wires and cables through abnormal discharge points, evaluate the tolerance of test equipment and wires and cables, and carry out maintenance and adjustments, which is beneficial to improving the stability and safety of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 A diagram showing an application environment of a method for locating and analyzing abnormalities in a withstand voltage test in an embodiment;

[0048] Figure 2 A schematic diagram of a flow chart of a method for locating and analyzing abnormalities in a withstand voltage test in an embodiment;

[0049] Figure 3 A schematic diagram of a flow chart of a method for locating and analyzing abnormalities in a withstand voltage test in another embodiment;

[0050] Figure 4 It is a flow chart of a method for locating and analyzing abnormalities in a withstand voltage test in another embodiment;

[0051] Figure 5 A schematic diagram of a flow chart of a method for locating and analyzing abnormalities in a withstand voltage test in yet another embodiment;

[0052] Figure 6 It is a structural block diagram of a device for locating and analyzing abnormalities in a withstand voltage test in one embodiment;

[0053] Figure 7 It is a structural block diagram of a pressure test abnormality positioning and analysis system in one embodiment;

[0054] Figure 8 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0056] The method for locating and analyzing abnormalities in a withstand voltage test provided in the embodiment of the present application can be applied to Figure 1 In the application environment shown, the data provider 102 communicates with the control terminal 104 through a network. The data storage system can store data that the control terminal 104 needs to process. The data storage system can be integrated on the control terminal 104, or placed on the cloud or other network servers.

[0057] Specifically, the operator may upload the collected sound signal and visible light image to the control terminal 104 through the data providing terminal 102, and then send the withstand voltage test abnormality location analysis message to the control terminal 104 through the data providing terminal 102, and the control terminal 104 obtains the sound signal and the visible light image, and then, when it is identified that there is an abnormal signal in the sound signal, a first discharge detection result is obtained based on the abnormal signal, and then, the visible light image is compared with a preset reference image, and it is detected whether there is a glow signal in the area where the test equipment is located, and the abnormal image detection result and the glow signal detection result are obtained; based on the abnormal image detection result and the glow signal detection result, it is determined that there is abnormal discharge, and the second discharge detection result is obtained, and finally, the abnormal discharge point is located according to the first discharge detection result and the second discharge detection result.

[0058] The data provider 102 may be, but is not limited to, various terminals in the power system, various personal computers, laptops, smart phones, tablet computers, IoT devices, and portable wearable devices. IoT devices may be smart speakers, smart TVs, smart air conditioners, smart vehicle-mounted devices, projection devices, etc. Portable wearable devices may be smart watches, smart bracelets, head-mounted devices, etc. Head-mounted devices may be virtual reality (VR) devices, augmented reality (AR) devices, smart glasses, etc. The control terminal 104 may be an independent physical server, a server cluster or distributed system consisting of multiple physical servers, or a cloud server that provides cloud computing services.

[0059] In an exemplary embodiment, Figure 2 As shown in the figure, a method for locating abnormalities in a withstand voltage test is provided. Figure 1 The control terminal 104 in FIG. 1 is used as an example to illustrate the method, which includes the following S100 to S500. Among them:

[0060] S100, when the voltage of the test equipment rises to and is maintained at a preset test high voltage, a sound signal and a visible light image of the area where the test equipment is located are obtained.

[0061] Among them, the test equipment may include AC and DC primary equipment in ultra-high voltage and ultra-high voltage converter stations, such as transformers, converter valves and DC voltage dividers. The preset test high voltage is determined according to the withstand voltage test requirements, which can be 300kv (kilovolts), 500kv or 900kv, etc. The control of the test equipment voltage can be carried out through high-voltage test booster equipment. High-voltage test booster equipment is mainly used to generate and control the required high voltage in order to perform withstand voltage tests on electrical equipment. The equipment type of high-voltage test booster equipment can be selected according to the type of power supply used (AC or DC) and the characteristics of the test equipment, test requirements, site conditions and other specific needs. High-voltage test booster equipment may include test transformers, DC high-voltage generators and impulse voltage generators.

[0062] The sound signal may include but is not limited to audible sound signals, ultrasonic signals, and infrasonic signals. The sound signal may be acquired by a sound sensor, wherein the sound sensor includes but is not limited to and Etc. The visible light image can be acquired by an image acquisition device.

[0063] In practical applications, a number of sound sensors and image acquisition devices may be arranged in advance in the area of ​​the equipment under test so that the range of the collected sound signals and visible light images covers the area where the test equipment is located. Then, when the test equipment is controlled to rise from the current voltage to the preset test high voltage (such as 500kv) through the high-voltage test booster device, and the test equipment is controlled to maintain the test high voltage according to the preset withstand voltage test dwell time, the sound signal and visible light image in the area where the test equipment is located are obtained through the sound acquisition sensor and the image acquisition device. Among them, the preset withstand voltage test dwell time is determined according to the type of test equipment and the test requirements. For example, the withstand voltage test dwell time for AC primary equipment can be 1 minute or 5 minutes, and the withstand voltage test dwell time for DC primary equipment can be 30 minutes or 1 hour, etc.

[0064] S200, identifying whether there is an abnormal signal in the sound signal, and obtaining a first discharge detection result.

[0065] The first discharge detection result is used to characterize whether there is abnormal discharge in the area where the device under test is located. The first discharge detection result may include information about no abnormal discharge and abnormal discharge. The abnormal discharge information may include the sound signal collected during abnormal discharge, signal amplitude, signal validity, abnormal discharge time, and abnormal discharge type.

[0066] In practical applications, the presence of abnormal signals in the sound signal can be identified by using preset abnormal signal detection rules. For example, a standard sound signal is obtained, and the collected sound signal is compared with the standard sound signal to detect whether there is noise, distortion or uneven volume to identify whether there is an abnormal signal in the sound signal. If there is an abnormal signal in the sound signal, it indicates that there may be abnormal discharge. The abnormal signal can be obtained, and the signal characteristics of the abnormal signal can be analyzed to determine the type of abnormal discharge and obtain the first discharge detection result. If there is no abnormal signal in the sound signal, it indicates that there is no abnormal discharge, and the first discharge detection result is obtained.

[0067] S300, comparing the visible light image with a preset reference image, and detecting whether there is a glow signal in the area where the test equipment is located, to obtain an image comparison result and a glow signal detection result.

[0068] The preset reference image may be a visible light image of the area where the test equipment is located, which is acquired before the start of the withstand voltage test. Glow refers to the faint light generated by the discharge phenomenon of the gas around the test equipment or the surface of the insulating material under high voltage. The glow signal can be detected by ultrasonic sensors, ultraviolet devices, etc. The glow signal detection results may include no glow signal and the presence of glow signal.

[0069] The comparison between the visible light image and the reference image can be performed by comparing pixel values ​​or using a hash algorithm, etc., and combining a preset similarity threshold to obtain an image comparison result. The image comparison result can include image similarity and image difference. The preset similarity threshold is determined according to the experimental scenario and requirements. For example, the similarity threshold can be set to 90%.

[0070] In practical applications, when the voltage of the test equipment rises to and is maintained at the preset test high voltage, the visible light image of the area where the test equipment is located can be continuously acquired, and the visible light image can be compared with the reference image by comparing pixel values. At the same time, the ultraviolet device is continuously used to detect whether there is a glow signal in the area where the test equipment is located, and image comparison results and glow signal detection results are obtained.

[0071] S400, judging whether there is abnormal discharge based on the image comparison result and the glow signal detection result, and obtaining a second discharge detection result.

[0072] Among them, abnormal discharge can refer to various abnormal discharge conditions such as lead tip discharge, AC / DC booster equipment or test equipment discharge, metal suspension discharge, etc. that occur during the withstand voltage test. When some abnormal discharge conditions occur, obvious visible light (such as arc discharge or spark discharge) may be generated, or weaker light may be generated. The second discharge detection result is used to characterize whether there is an abnormal discharge condition in the area where the test equipment is located. The second discharge detection result may include information on no abnormal discharge and abnormal discharge. The abnormal discharge information may include visible light images collected during abnormal discharge, abnormal discharge time, and abnormal discharge type.

[0073] In practical applications, the abnormal discharge image analysis strategy can be set in advance according to the characteristics and intensity of light caused by different abnormal discharge types. For example, under corona discharge, a weak glow may be generated; under suspension power generation, visible light with high illumination intensity may be generated. In this way, the abnormal discharge image analysis strategy can be set. In this way, the abnormal discharge image analysis strategy, the image comparison result of visible light and the glow signal detection result can be combined to determine whether there is abnormal discharge in the area where the test equipment is located, and the second discharge detection result can be obtained.

[0074] S500, when the first discharge detection result and the second discharge detection result indicate that abnormal discharge exists, locate the abnormal discharge point according to the first discharge detection result and the second discharge detection result.

[0075] In practical applications, when the first discharge detection result and the second discharge detection result indicate that there is abnormal discharge in the area where the test equipment is located, the abnormal discharge point is located by using the abnormal discharge information in the first discharge detection result and the second discharge detection result. Specifically, the same abnormal discharge situation can be captured according to the abnormal discharge time in the first discharge detection result and the second discharge detection result, and the abnormal discharge point can be located by using the sound source localization method and the position of the image acquisition device corresponding to the visible light image according to the abnormal sound signal and the visible light image in the first discharge detection result and the second discharge detection result.

[0076] The above-mentioned method for locating and analyzing abnormalities in the withstand voltage test is different from the traditional method of checking abnormal discharges in the leads and test circuits during the withstand voltage test by relying on the experience, technology, manual observation and sound identification of the test personnel. By performing image capture and comparison, glow signal detection, sound signal acquisition and abnormal signal detection on the test equipment, the abnormalities in the withstand voltage test are automatically checked and located from multiple dimensions, and the abnormal discharge is preliminarily located to obtain the first discharge detection result and the second discharge detection result. Further, according to the first discharge detection result and the second discharge detection result, the abnormal discharge in the test equipment area is determined, which reduces the possibility of misjudgment of abnormal location, thereby being able to capture the abnormal discharge that occurs in an instant during the withstand voltage test, and realize the location of the abnormal discharge point. Compared with the method of manually checking and locating the abnormal discharge point, the accuracy of abnormal discharge location in the withstand voltage test of ultra-high and ultra-high voltage AC and DC equipment is improved. Furthermore, through the multi-dimensional automatic abnormality checking and locating method, the possibility of abnormal location requiring multiple boosts to reproduce the abnormality is reduced, and the efficiency of abnormal location is improved. Furthermore, it is helpful for test personnel to check the insulation quality of test equipment and wires and cables through abnormal discharge points, evaluate the tolerance capacity of test equipment and wires and cables, and carry out maintenance and adjustments, which is beneficial to improving the stability and safety of the power system.

[0077] In order to improve the accuracy of locating the abnormal discharge point, in an exemplary embodiment, as Figure 3 As shown, S500 includes S520 to S560. Among them:

[0078] S520 , screening out a target first discharge detection result and a target second discharge detection result having the same abnormal discharge time from the first discharge detection result and the second discharge detection result.

[0079] The first discharge detection result and the second discharge detection result include abnormal discharge time and abnormal discharge type.

[0080] In practical applications, the abnormal discharge time in the second discharge detection result may be matched with the first discharge detection result having the same abnormal discharge time, and the matched first discharge detection result and second discharge detection result may be determined as the target first discharge detection result and the target second discharge detection result.

[0081] S540: If the abnormal discharge types of the target first discharge detection result and the target second discharge detection result are consistent, locate the abnormal discharge point based on the target first discharge detection result and the target second discharge detection result.

[0082] In actual applications, if the abnormal discharge types in the target first discharge detection result and the target second discharge detection result are consistent, indicating that there is abnormal discharge in the area where the test equipment is located, the abnormal discharge information in the target first discharge detection result and the target second discharge detection result is adopted to locate the abnormal discharge point. Specifically, the abnormal discharge point can be located based on the abnormal sound signal in the first discharge detection result through the sound source localization technology, and the time delay and intensity difference of the abnormal sound signal reaching the sound collection device can be used in combination with the visible light image in the target second discharge detection result to obtain the location information of the sound source of the abnormal sound signal.

[0083] S560: If the abnormal discharge types of the target first discharge detection result and the target second discharge detection result are inconsistent, locate the abnormal discharge point based on the target second discharge detection result.

[0084] In practical applications, if the abnormal discharge types in the target first discharge detection result and the target second discharge detection result are inconsistent, it means that there may be noise interference in the area where the test equipment is located, resulting in inaccurate abnormal discharge types in the target first discharge detection result, then the information in the target second discharge detection result is adopted to locate the abnormal discharge point. Specifically, the range of the abnormal discharge point can be located by the position of the image acquisition device corresponding to the visible light image in the target second discharge detection result.

[0085] In this embodiment, by comparing the abnormal discharge time and the abnormal discharge type in the first and second discharge detection results, it is determined whether the abnormal discharge point is located based on the first discharge detection result and the second discharge detection result, or whether the abnormal discharge point is located based on the second discharge detection result, thereby reducing the possibility of abnormal positioning errors and improving the accuracy of abnormal discharge positioning.

[0086] The sound signal includes an audible sound signal and an ultrasonic signal. In an exemplary embodiment, Figure 4 As shown, S200 includes S220 to S260. Among them:

[0087] S220, performing denoising processing on the audible sound signal and the ultrasonic signal through a reference audible sound signal and a reference ultrasonic signal, wherein the reference audible sound signal and the reference ultrasonic signal are acquired when the voltage of the test equipment is at a preset reference voltage.

[0088] The preset reference voltage may be a voltage of the test equipment that makes the area where the test equipment is located less likely to have abnormal discharge. The reference voltage may be determined according to the withstand voltage test type and test experience. For example, the reference voltage is set to 100 kV. It is understood that in addition to 100 kV, the reference voltage may also be 120 kV or 150 kV in other embodiments, which is not limited here.

[0089] In practical applications, the test equipment can be controlled in advance to be at a preset reference voltage through a high-voltage test booster device, and a reference audible sound signal and a reference ultrasonic signal can be collected by a sound collection sensor, and then the reference audible sound signal and the reference ultrasonic signal can be denoised by a denoising algorithm. Specifically, based on a preset noise threshold, a wavelet denoising algorithm is used to denoise the reference audible sound signal and the reference ultrasonic signal, so that the noise level of the reference audible sound signal and the reference ultrasonic signal is less than a preset noise threshold. The preset noise threshold can be set according to the test environment and test requirements, such as 10 decibels. The acquired audible sound signal and ultrasonic signal are denoised by the denoised reference audible sound signal and the reference ultrasonic signal.

[0090] S240 , when an abnormal signal exists in at least one of the audible sound signal and the ultrasonic signal after denoising, determine the abnormal discharge type of the abnormal signal based on a preset abnormal discharge signal analysis strategy.

[0091] The abnormal signal is used to characterize the sound signal caused by the abnormal discharge. The detection of the abnormal signal in the audible sound signal and the ultrasonic signal can be performed in the following manner: respectively comparing the frequency domain difference between the reference audible sound signal and the audible sound signal, and the frequency domain difference between the reference ultrasonic signal and the ultrasonic signal, and if the frequency domain difference exceeds a preset frequency domain difference threshold, it is determined that an abnormal signal exists.

[0092] The abnormal discharge signal analysis strategy can be set by analyzing the frequency and signal characteristics of the sound signal caused by different abnormal discharge types. The abnormal discharge signal analysis strategy can include the signal characteristics of the audible sound signal and ultrasonic signal caused by multiple different abnormal discharge types. For example, the characteristics of the sound signal corresponding to corona discharge can be a continuous high-frequency sound signal (ultrasonic signal), and the characteristics of the sound signal corresponding to gap discharge can be a short and discontinuous wide-band sound signal (audible sound signal and ultrasonic signal).

[0093] In practical applications, a preset frequency domain difference threshold is used to determine whether the denoised audible sound signal and / or ultrasonic signal has an abnormal signal whose noise exceeds the noise threshold. In the case where an abnormal signal exists in at least one of the denoised audible sound signal and ultrasonic signal, the abnormal signal is extracted, the characteristics of the abnormal signal are analyzed, and the abnormal discharge type corresponding to the abnormal signal is determined according to a preset abnormal discharge signal analysis strategy.

[0094] S260, determining an abnormal discharge position based on the abnormal signal, wherein the first discharge detection result includes an abnormal discharge time, an abnormal discharge type and an abnormal discharge position of the abnormal signal.

[0095] In practical applications, the three-dimensional coordinates of the sound source of the abnormal signal can be measured and located by the sound collection sensors and positioning modules in the multiple sound collection devices deployed in the area where the test equipment is located through the trilateral measurement method to obtain the abnormal discharge position. The occurrence time of the abnormal signal is determined as the abnormal discharge time. The first discharge detection result is obtained through the abnormal discharge time, abnormal discharge type and abnormal discharge position of the abnormal signal.

[0096] In this embodiment, on the one hand, abnormal signal detection is performed on the audible sound signal and the ultrasonic signal respectively. When an abnormal signal is detected, the first discharge detection result is obtained through the preset abnormal discharge signal analysis strategy and abnormal discharge position positioning method, thereby improving the accuracy of the first discharge detection result. On the other hand, by denoising the collected audible sound signal and ultrasonic signal, the quality of the sound signal is improved to reduce the possibility of misjudgment when abnormal signal detection is performed on the audible sound signal and ultrasonic signal, which is conducive to improving the accuracy of abnormal discharge analysis based on the audible sound signal and ultrasonic signal.

[0097] By using a preset abnormal discharge signal analysis strategy, the abnormal discharge type of the abnormal signal is determined. In an exemplary embodiment, S240 includes S242 to S246. Among them:

[0098] S242: When the audible sound signal and the ultrasonic signal both have a steep wave signal, determine that the abnormal discharge type of the abnormal signal is gap discharge or surface discharge.

[0099] Among them, the steep wave signal can be a signal with a large slope or rate of change in the rising or falling process. It can be determined whether the abnormal signal is a steep wave signal by time domain analysis or frequency domain analysis. Gap discharge refers to the discharge phenomenon that occurs in the gap (air gap) inside the insulating material or between different insulating layers. Surface discharge refers to the discharge phenomenon that occurs on the surface of the insulating material or along the surface of the solid insulation.

[0100] In practical applications, when abnormal signals exist in both audible sound signals and ultrasonic signals, and the abnormal signals are determined to be steep wave signals through a time domain analysis method, the abnormal discharge type of the abnormal signals is determined to be gap discharge or surface discharge.

[0101] S244: When there is no abnormal signal in the audible sound signal and there is a periodic abnormal signal in the ultrasonic signal, determine that the abnormal discharge type of the abnormal signal is corona discharge.

[0102] The periodic abnormal signal may be a signal that appears repeatedly within a certain time interval. The algorithm identifies periodic abnormal signals in abnormal signals. Corona discharge is a local discharge phenomenon that occurs on the surface of test equipment (such as insulators, cables, transformers, etc.) under high voltage.

[0103] In practical applications, when there is no abnormal signal in the audible sound signal and there is an abnormal signal in the ultrasonic signal, and the abnormal signal is identified as a periodic abnormal signal through the Fourier transform algorithm, the abnormal discharge type of the abnormal signal is determined to be corona discharge.

[0104] S246: When the audible sound signal has a periodic abnormal signal and the ultrasonic signal has no abnormal signal, determine that the abnormal discharge type of the abnormal signal is a suspended discharge.

[0105] Among them, suspended discharge refers to the ionization phenomenon that occurs at the contact interface between gas and solid material because the electric field strength exceeds the breakdown electric field strength.

[0106] In practical applications, when there is an abnormal signal in the audible sound signal, the abnormal signal is identified as a periodic abnormal signal through the Fourier transform algorithm, and there is no abnormal signal in the ultrasonic signal, the abnormal discharge type of the abnormal signal is determined to be a suspended discharge.

[0107] In other embodiments, when there is an abnormal signal in the audible signal but the abnormal signal does not repeat periodically and there is no abnormal signal in the ultrasonic signal, the abnormal signal is determined to be an interference signal. When the abnormal signal is determined to be an interference signal, it is not necessary to locate the sound source of the interference signal.

[0108] In this embodiment, according to the abnormal discharge signal analysis strategy preset according to different abnormal discharge characteristics, the abnormal discharge type corresponding to the abnormal signal in the audible signal and / or ultrasonic signal is analyzed, thereby improving the accuracy of troubleshooting the abnormal discharge type in the withstand voltage test.

[0109] In the case where the first discharge detection result and the second discharge detection result indicate that abnormal discharge exists, in an exemplary embodiment, Figure 5As shown, S400 includes S420 to S460. Among them:

[0110] S420, when the glow signal detection result indicates that there is a glow signal and the image comparison result indicates that the similarity between the visible light image and the reference image is higher than a preset similarity threshold, determining that the abnormal discharge type of the visible light image is corona discharge.

[0111] In practical applications, the presence of a glow signal in the area where the test equipment is located is detected by an ultraviolet sensor. At the same time, if the similarity between the visible light image captured by the image acquisition device and the reference image is higher than a preset similarity threshold, it means that there is no visible light caused by abnormal discharge in the visible light image, and the type of abnormal discharge that causes the glow signal is determined to be corona discharge.

[0112] S440, when the glow signal detection result indicates that there is no glow signal and the image comparison result indicates that the similarity between the visible light image and the reference image is lower than a preset similarity threshold, determine that the abnormal discharge type of the visible light image is suspended discharge.

[0113] In practical applications, when the glow signal detection result shows that there is no glow signal in the area where the test equipment is located, and at the same time, the similarity between the visible light image captured by the image acquisition device and the reference image is lower than the preset similarity threshold, it means that there is visible light caused by abnormal discharge in the visible light image, and the type of abnormal discharge causing the visible light is determined to be suspended discharge.

[0114] S460, when the glow signal detection result indicates the presence of a glow signal, and the image comparison result indicates that the similarity between the visible light image and the reference image is lower than a preset similarity threshold, determine that the abnormal discharge type of the visible light image is gap discharge or surface discharge, and the second discharge detection result includes the visible light image collected at the moment when the glow signal is detected, and the abnormal discharge type of the visible light image.

[0115] In practical applications, the ultraviolet sensor detects the presence of a glow signal in the area where the test equipment is located. At the same time, if the similarity between the visible light image captured by the image acquisition device and the reference image is lower than the preset similarity threshold, it means that there is visible light caused by abnormal discharge in the visible light image, and the type of abnormal discharge is determined to be gap discharge or surface discharge.

[0116] In this embodiment, the glow signal detection result is combined with the image comparison result between the visible light image and the reference image to detect whether there is visible light caused by abnormal discharge, and the discharge type of abnormal discharge in the area where the test equipment is located is analyzed, thereby improving the accuracy of troubleshooting abnormal discharge types in the withstand voltage test.

[0117] In order to improve the accuracy of locating abnormal discharge points through image comparison results, in an exemplary embodiment, the withstand voltage test abnormality location analysis method further includes S620 to S660. Among them:

[0118] S620, when the voltage of the test equipment is at a preset reference voltage, detecting whether there is a glow signal in the area where the test equipment is located, and obtaining a glow signal detection result.

[0119] S640, when the glow signal detection result indicates that there is a glow signal, obtain a target visible light image collected when the glow signal is detected, and determine that the target visible light image is an abnormal image.

[0120] S660, generating warning information based on the abnormal image, and pushing the warning information.

[0121] In order to improve the accuracy of abnormal discharge detection and abnormal discharge point location through visible light images, the voltage of the test equipment can be controlled to be at a preset reference voltage before the voltage of the test equipment rises to the test high voltage, and glow signal detection can be performed. If a glow signal is detected at the reference voltage, it means that the test circuit has poor contact or the safety distance between the test equipment is insufficient. It is necessary to push an alarm message to prompt the relevant experimenters to reduce the voltage of the test equipment to zero, and adjust the test circuit and the test equipment placement distance according to the abnormal situation.

[0122] In practical applications, first, the voltage of the test equipment is controlled to be at a preset reference voltage through a high-voltage test booster, and the ultraviolet device is used to detect whether there is a glow signal in the area where the test equipment is located, and the glow signal detection result is obtained. The glow signal detection result includes the presence of a glow signal and the absence of a glow signal.

[0123] After obtaining the glow signal detection result, the target visible light image collected when the glow signal is detected is extracted, and the target visible light image is determined as an abnormal image.

[0124] After obtaining the abnormal image, the moment when the glow signal is detected is determined as the abnormal moment, and an alarm message is generated based on the abnormal moment and the abnormal image, and the alarm message is pushed to prompt the relevant test personnel to make adjustments. The method of pushing the alarm message may include pushing the alarm message in the notification bar of the controller display, and displaying the alarm message in the form of a full-screen or half-screen pop-up window. On this basis, it is also possible to make an auditory alarm prompt by emitting a specific sound or vibration pattern, and to make a visual alarm prompt by flashing an indicator light. It is understandable that the method of pushing the alarm message may be a combination of the aforementioned method of pushing the alarm message and any of the aforementioned alarm prompt methods or any multiple alarm prompt methods, which is not limited here.

[0125] In this embodiment, by performing glow signal detection at the reference voltage in advance, it is determined whether there is a situation that may affect the accuracy of abnormal discharge investigation and positioning in the withstand voltage test, and timely adjustments are made to reduce the problem of low accuracy in determining the type of abnormal discharge and locating the abnormal discharge point in the withstand voltage test due to poor contact in the test circuit or insufficient safety distance between the test equipment, which is conducive to improving the accuracy of determining the type of abnormal discharge and locating the abnormal discharge point. At the same time, the possibility of repeated tests is reduced, which is conducive to improving the efficiency of locating abnormal discharge points.

[0126] In other embodiments, the method for locating and analyzing abnormalities in a withstand voltage test further includes: in the process of the voltage of the test equipment dropping from the test high voltage to the reference voltage, obtaining a sound signal in the area where the test equipment is located, identifying whether the sound signal has an abnormal signal, and obtaining a third discharge detection result, the sound signal includes an audible sound signal and an ultrasonic signal. In this embodiment, it is identified whether the sound signal has an abnormal signal, and the third discharge detection result is obtained, referring to the method for obtaining the first discharge detection result. For the specific process, refer to the above embodiment, based on the reference audible sound signal and the reference ultrasonic signal, the audible sound signal and the ultrasonic signal are denoised, and in the case that at least one of the denoised audible sound signal and the ultrasonic signal has an abnormal signal, based on the preset abnormal discharge signal analysis strategy, the abnormal discharge type is determined, and the abnormal discharge time and abnormal discharge position are determined based on the abnormal signal, and the implementation process of obtaining the first discharge detection result is not repeated here.

[0127] In other embodiments, the method for locating and analyzing abnormalities in a withstand voltage test further includes: in the process of reducing the voltage of the test equipment from the test high voltage to the reference voltage, obtaining a visible light image of the area where the test equipment is located, comparing the visible light image with a preset reference image, obtaining an image comparison result, and judging whether there is abnormal discharge based on the image comparison result to obtain a fourth discharge detection result. In this embodiment, the visible light image is compared with the preset reference image to obtain an image comparison result. Referring to the above method for obtaining the image comparison result, the specific process refers to the implementation process of S300 in the above embodiment, which is not repeated here. Among them, judging whether there is abnormal discharge based on the image comparison result, and obtaining a fourth discharge detection result, specifically, when the image comparison result indicates that the similarity between the visible light image and the reference image is lower than the preset similarity threshold, it is determined that there is abnormal discharge in the area where the test equipment is located, and the fourth discharge detection result may include a visible light image lower than the preset similarity threshold and an abnormal discharge time (the acquisition time of the visible light image); when the image comparison result indicates that the similarity between the visible light image and the reference image is higher than the similarity threshold, it is determined that there is no abnormal discharge in the area where the test equipment is located, and the fourth discharge detection result includes no abnormal discharge.

[0128] In other embodiments, the method for locating and analyzing abnormalities in a withstand voltage test further includes: in the process of reducing the voltage of the test equipment from the test high voltage to the reference voltage, determining the target third discharge detection result and the fourth discharge detection result that characterize the presence of abnormal discharge from the third discharge detection result and the fourth discharge detection result. If the abnormal discharge time in the target third discharge detection result and the target fourth discharge detection result is the same, merging the abnormal discharge information in the target third discharge detection result and the target fourth discharge detection result to generate abnormal alarm information, and pushing the abnormal alarm information; if the abnormal discharge time in the target third discharge detection result and the target fourth discharge detection result is different, generating abnormal alarm information according to the abnormal discharge information in the target third discharge detection result and the target fourth discharge detection result, respectively, and pushing the abnormal alarm information.

[0129] In order to make a clearer description of the method for locating and analyzing abnormalities in a withstand voltage test provided by the present application, a specific embodiment is described below. The specific embodiment includes the following steps:

[0130] S1, when the voltage of the test equipment is at a preset reference voltage, detect whether there is a glow signal in the area where the test equipment is located, and obtain a glow signal detection result. When the glow signal detection result indicates the existence of a glow signal, obtain a target visible light image collected at the moment the glow signal is detected, determine that the target visible light image is an abnormal image, generate an alarm information based on the abnormal image, and push the alarm information.

[0131] S2, when the voltage of the test equipment rises to and is maintained at a preset test high voltage, a sound signal and a visible light image of the area where the test equipment is located are obtained.

[0132] S3, performing denoising processing on the audible sound signal and the ultrasonic signal through a reference audible sound signal and a reference ultrasonic signal, wherein the reference audible sound signal and the reference ultrasonic signal are acquired when the voltage of the test equipment is at a preset reference voltage.

[0133] S4, when there is an abnormal signal in at least one of the audible sound signal and the ultrasonic signal after denoising, and when there are steep wave signals in both the audible sound signal and the ultrasonic signal, determine that the abnormal discharge type of the abnormal signal is gap discharge or surface discharge; when there is no abnormal signal in the audible sound signal and there is a periodic abnormal signal in the ultrasonic signal, determine that the abnormal discharge type of the abnormal signal is corona discharge; when there is a periodic abnormal signal in the audible sound signal and there is no abnormal signal in the ultrasonic signal, determine that the abnormal discharge type of the abnormal signal is suspended discharge.

[0134] S5, based on the abnormal signal, determine the abnormal discharge position, and obtain a first discharge detection result, the first discharge detection result includes the abnormal discharge time, abnormal discharge type and abnormal discharge position of the abnormal signal.

[0135] S6, comparing the visible light image with a preset reference image, and detecting whether there is a glow signal in the area where the test equipment is located, to obtain an image comparison result and a glow signal detection result.

[0136] S7, when the glow signal detection result indicates the presence of a glow signal and the image comparison result indicates that the similarity between the visible light image and the reference image is higher than a preset similarity threshold, the abnormal discharge type of the visible light image is determined to be corona discharge; when the glow signal detection result indicates the absence of a glow signal and the image comparison result indicates that the similarity between the visible light image and the reference image is lower than a preset similarity threshold, the abnormal discharge type of the visible light image is determined to be suspended discharge; when the glow signal detection result indicates the presence of a glow signal and the image comparison result indicates that the similarity between the visible light image and the reference image is lower than a preset similarity threshold, the abnormal discharge type of the visible light image is determined to be gap discharge or surface discharge, and the second discharge detection result includes the visible light image acquired at the moment when the glow signal is detected, and the abnormal discharge type of the visible light image.

[0137] S8, when the first discharge detection result and the second discharge detection result indicate the presence of abnormal discharge, select a target first discharge detection result and a target second discharge detection result having the same abnormal discharge time from the first discharge detection result and the second discharge detection result.

[0138] S9, if the abnormal discharge types of the target first discharge detection result and the target second discharge detection result are consistent, locate the abnormal discharge point based on the target first discharge detection result and the target second discharge detection result; if the abnormal discharge types of the target first discharge detection result and the target second discharge detection result are inconsistent, locate the abnormal discharge point based on the target second discharge detection result.

[0139] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0140] In an exemplary embodiment, Figure 6 As shown, a withstand voltage test abnormality location analysis device 600 is provided, comprising: a data acquisition module 610, a first discharge detection module 620, a second discharge detection module 630 and an abnormality location analysis module 640, wherein:

[0141] The data acquisition module 610 is used to acquire the sound signal and visible light image of the area where the test equipment is located when the voltage of the test equipment rises to and is maintained at a preset test high voltage.

[0142] The first discharge detection module 620 is used to identify whether the sound signal contains an abnormal signal and obtain a first discharge detection result.

[0143] The second discharge detection module 630 is used to compare the visible light image with a preset reference image, and detect whether there is a glow signal in the area where the test equipment is located, to obtain an image comparison result and a glow signal detection result; based on the image comparison result and the glow signal detection result, it is determined whether there is an abnormal discharge to obtain a second discharge detection result.

[0144] The abnormality location analysis module 640 is used to locate the abnormal discharge point according to the first discharge detection result and the second discharge detection result when the first discharge detection result and the second discharge detection result indicate the existence of abnormal discharge.

[0145] In an exemplary embodiment, the abnormal location analysis module 640 is also used to screen out the target first discharge detection result and the target second discharge detection result with the same abnormal discharge time from the first discharge detection result and the second discharge detection result; if the abnormal discharge types of the target first discharge detection result and the target second discharge detection result are consistent, then the abnormal discharge point is located based on the target first discharge detection result and the target second discharge detection result; if the abnormal discharge types of the target first discharge detection result and the target second discharge detection result are inconsistent, then the abnormal discharge point is located based on the target second discharge detection result.

[0146] In an exemplary embodiment, the first discharge detection module 620 is further used to perform denoising processing on the audible sound signal and the ultrasonic signal through a reference audible sound signal and a reference ultrasonic signal, wherein the reference audible sound signal and the reference ultrasonic signal are acquired when the voltage of the test equipment is at a preset reference voltage; when an abnormal signal exists in at least one of the denoised audible sound signal and the ultrasonic signal, based on a preset abnormal discharge signal analysis strategy, the abnormal discharge type of the abnormal signal is determined; based on the abnormal signal, the abnormal discharge position is determined, and the first discharge detection result includes the abnormal discharge time, abnormal discharge type and abnormal discharge position of the abnormal signal.

[0147] In an exemplary embodiment, the first discharge detection module 620 is also used to determine that the abnormal discharge type of the abnormal signal is gap discharge or surface discharge when steep wave signals exist in both the audible sound signal and the ultrasonic signal; to determine that the abnormal discharge type of the abnormal signal is corona discharge when there is no abnormal signal in the audible sound signal and a periodic abnormal signal exists in the ultrasonic signal; and to determine that the abnormal discharge type of the abnormal signal is suspended discharge when there is a periodic abnormal signal in the audible sound signal and no abnormal signal exists in the ultrasonic signal.

[0148] In an exemplary embodiment, the second discharge detection module 630 is further configured to determine that the abnormal discharge type of the visible light image is corona discharge when the glow signal detection result indicates that there is a glow signal and the image comparison result indicates that the similarity between the visible light image and the reference image is higher than a preset similarity threshold;

[0149] When the glow signal detection result indicates that there is no glow signal, and the image comparison result indicates that the similarity between the visible light image and the reference image is lower than a preset similarity threshold, determining that the abnormal discharge type of the visible light image is suspended discharge;

[0150] When the glow signal detection result indicates the presence of a glow signal, and the image comparison result indicates that the similarity between the visible light image and the reference image is lower than a preset similarity threshold, the abnormal discharge type of the visible light image is determined to be gap discharge or surface discharge, and the second discharge detection result includes the visible light image collected at the moment when the glow signal is detected, and the abnormal discharge type of the visible light image.

[0151] In an exemplary embodiment, the second discharge detection module 630 is further used to detect whether there is a glow signal in the area where the test equipment is located when the voltage of the test equipment is at a preset reference voltage, and obtain a glow signal detection result; when the glow signal detection result indicates the presence of a glow signal, obtain a target visible light image collected at the time when the glow signal is detected, and determine that the target visible light image is an abnormal image;

[0152] The withstand voltage test abnormality location analysis device 600 also includes an alarm information push module 650, which is used to generate alarm information based on the abnormal image and push the alarm information.

[0153] In an exemplary embodiment, the alarm information push module 650 is also used to generate an abnormal discharge event report based on the first discharge detection result and the second discharge detection result when the first discharge detection result and the second discharge detection result indicate the existence of abnormal discharge. The abnormal discharge event report includes the abnormal discharge time, abnormal discharge type and abnormal discharge location.

[0154] Each module in the above-mentioned withstand voltage test abnormality location analysis device 600 can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory in the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0155] In an exemplary embodiment, Figure 7 A pressure test abnormality location analysis system is provided, including a controller 120, a sound recognition system 140 and an image recognition system 160, wherein:

[0156] The sound recognition system 140 is used to collect sound signals in the area where the test equipment is located when the voltage of the test equipment rises to and is maintained at a preset test high voltage, identify whether there are abnormal signals in the sound signals, obtain a first discharge detection result, and send the first discharge detection result to the controller 120.

[0157] The image recognition system 160 is used to collect a visible light image of the area where the test equipment is located when the voltage of the test equipment rises to and is maintained at a preset test high voltage; compare the visible light image with a preset reference image, and detect whether there is a glow signal in the area where the test equipment is located, to obtain an image comparison result and a glow signal detection result, and determine whether there is abnormal discharge based on the image comparison result and the glow signal detection result, to obtain a second discharge detection result, and to send the second discharge detection result to the controller 120.

[0158] The controller 120 is used to receive the first discharge detection result and the second discharge detection result, and locate the abnormal discharge point according to the first discharge detection result and the second discharge detection result when the first discharge detection result and the second discharge detection result indicate the existence of abnormal discharge.

[0159] In practical applications, the sound recognition system 140 can be composed of a number of sound signal acquisition devices and a sound recognition host to realize the acquisition, analysis and processing of sound signals in the area where the test equipment is located, abnormal location and the sending of abnormal alarm information. The sound signal acquisition device and the sound recognition host exchange data through optical fiber communication. Among them, the sound signal acquisition device includes a tripod bracket, a composite sound acquisition device and a communication module. The tripod bracket is used to support and adjust the height of the sensor. The composite sound acquisition device includes a grating sound pressure sensor, an ultrasonic sensor and a GPS positioning module. The grating sound pressure sensor is used to collect audible sound signals, the ultrasonic sensor is used to collect ultrasonic sound signals, and the GPS positioning module is used to locate the three-dimensional coordinates of the sound acquisition sensor, and the position of the abnormal sound is calculated through the position information of different sound acquisition sensors. The communication module is used for data transmission between the sound acquisition sensor and the sound recognition host.

[0160] The sound recognition host processes and analyzes the audible sound signals and ultrasonic signals sent by each sound signal collection device, and classifies the abnormal discharge type and locates the abnormal discharge point of the abnormal signal. The sound recognition host exchanges data with the controller 120.

[0161] In practical applications, the image recognition system 160 is composed of several image acquisition devices and an image recognition host to collect, analyze and process visible light images of the area where the test equipment is located, and send abnormal alarm information. The image acquisition sensor and the image recognition host exchange data through optical fiber communication.

[0162] The image acquisition device includes a fixing device, a visible light camera device, an ultraviolet sensor, and a communication module. The fixing device is used to fix the image acquisition device to prevent the image acquisition device from being damaged by vibration, wind and other external forces when used indoors or outdoors. The visible light camera device is used to collect visible light images of the area where the test equipment is located, and the maximum wide angle is not less than 180 degrees. The ultraviolet sensor is used to detect the glow signal of the area where the test equipment is located. When the visible light camera device and the ultraviolet sensor are arranged on site, the angle is adjusted according to the actual test needs. The communication module is used for data transmission between the image acquisition device and the image recognition host.

[0163] The image recognition host is used to process and analyze the relevant information sent by each image acquisition device, and classify the abnormal discharge type of the abnormal image. The image recognition host exchanges data with the controller 120.

[0164] In practical applications, the controller 120 may include a data processor, a display, and an input device. The abnormal discharge alarm information may be synthesized, analyzed, and displayed for the first discharge detection result and the second discharge detection result. The controller 120 may also record, replay, save, and export the abnormal discharge alarm information. The controller 120 may also have three process selection functions: reference voltage recording, test boost recording, and test voltage reduction recording. The operator may select and run different work scenes in turn according to different processes of the high-voltage test. The reference voltage recording mainly includes recording the reference audible sound signal, reference ultrasonic signal, and reference image obtained when the voltage of the test equipment is increased from 0kV to the reference voltage; the test boost recording mainly includes the voltage rising from the reference voltage to the test high voltage, and the collection, storage, and alarm push of abnormal discharge information during the test high voltage stay; the test voltage reduction recording mainly includes the collection, storage, and alarm push of abnormal discharge information during the process of the voltage dropping from the test voltage to 0kV.

[0165] Through the interaction of the controller, sound recognition system and image recognition system of the above-mentioned voltage withstand test abnormality positioning analysis system, the steps of any one of the above-mentioned voltage withstand test abnormality positioning analysis method embodiments are executed to identify abnormal discharge conditions during the voltage withstand test and locate abnormal discharge points.

[0166] By deploying a withstand voltage test abnormality positioning and analysis system in the area where the test equipment is located, abnormal image capture and multi-point sound tracing positioning are performed during the voltage boosting process of the test equipment according to the sound recognition system and image recognition system in the system, so as to obtain a first discharge detection result and a second discharge detection result. A controller is used to further analyze whether there is abnormal discharge according to the first discharge detection result and the second discharge detection result, so as to locate the abnormal discharge point when there is abnormal discharge, thereby realizing the automatic capture of abnormal discharge points in the test, and improving the accuracy and efficiency of locating abnormal discharge points in withstand voltage tests of ultra-high and extra-high voltage AC and DC equipment.

[0167] In an exemplary embodiment, the sound recognition system 140 is also used to denoise the audible sound signal and the ultrasonic signal through a reference audible sound signal and a reference ultrasonic signal. The reference audible sound signal and the reference ultrasonic signal are acquired when the voltage of the test equipment is at a preset reference voltage. When an abnormal signal exists in at least one of the denoised audible sound signal and the ultrasonic signal, based on a preset abnormal discharge signal analysis strategy, the abnormal discharge type of the abnormal signal is determined, and based on the abnormal signal, the abnormal discharge position is determined, and the first discharge detection result includes the abnormal discharge time, abnormal discharge type and abnormal discharge position of the abnormal signal.

[0168] The controller 120 is also used to generate an abnormal discharge event report based on the first discharge detection result and the second discharge detection result when the first discharge detection result and the second discharge detection result indicate the existence of abnormal discharge. The abnormal discharge event report includes the abnormal discharge time, abnormal discharge type and abnormal discharge location.

[0169] In actual applications, when the first discharge detection result and the second discharge detection result indicate the presence of abnormal discharge, the controller 120 can extract the abnormal discharge time, abnormal discharge type, abnormal signal, visible light image, abnormal discharge location, etc. from the first discharge detection result and the second discharge detection result to generate an abnormal discharge event report, so that the test personnel can evaluate the tolerance of the test equipment and wires and cables through the abnormal discharge event report and make subsequent adjustments.

[0170] In order to make a clearer description of the pressure test abnormality location analysis system and the pressure test abnormality location method provided by the present application, in a possible implementation manner, the abnormality location of the pressure test abnormality location analysis system may be:

[0171] The first step is to deploy a number of sound collection sensors and image collection devices, as well as corresponding sound recognition hosts and image recognition hosts in the area where the test equipment is located. Complete the online self-test and clock consistency check of each component of the sound recognition system and image recognition system.

[0172] In the second step, the voltage of the test equipment is raised to the reference voltage through the booster device, and the sound recognition system collects the reference audible sound signal, reference ultrasonic signal, amplitude, effective value, 50Hz correlation, and test frequency correlation of the reference ultrasonic signal. The image recognition system collects the reference image.

[0173] In the third step, the voltage of the test equipment is controlled by the booster device to rise from the reference voltage to the test high voltage. During the stay of the test high voltage, the sound recognition system collects the sound signal of the area where the test equipment is located in real time, identifies whether there is an abnormal signal in the sound signal, obtains the first discharge detection result, and sends the first discharge detection result to the controller. At the same time, the image recognition system collects the visible light image of the area where the test equipment is located, compares the visible light image with the preset reference image, and detects whether there is a glow signal in the area where the test equipment is located, obtains the image comparison result and the glow signal detection result, and judges whether there is abnormal discharge based on the image comparison result and the glow signal detection result to obtain the second discharge detection result, and sends the second discharge detection result to the controller. The controller receives the first discharge detection result sent by the sound recognition system and the second discharge detection result sent by the image recognition system. When the first discharge detection result and the second discharge detection result indicate the existence of abnormal discharge, the abnormal discharge point is located according to the first discharge detection result and the second discharge detection result, and the abnormal alarm information is generated based on the first discharge detection result and the second discharge detection result, as well as the located abnormal discharge point, and the abnormal alarm information is pushed.

[0174] In the fourth step, during the process of controlling the voltage of the test equipment to drop from the test high voltage to the reference voltage through the booster device, the sound recognition system collects the sound signal of the area where the test equipment is located, identifies whether there is an abnormal signal in the sound signal, obtains the third discharge detection result, and sends the third discharge detection result to the controller. At the same time, the image recognition system collects the visible light image of the area where the test equipment is located, compares the visible light image with the preset reference image, obtains the image comparison result, judges whether there is abnormal discharge based on the image comparison result, obtains the fourth discharge detection result, and sends the fourth discharge detection result to the controller. The controller receives the third discharge detection result and the fourth discharge detection result at the same time, and determines the target third discharge detection result and the fourth discharge detection result that characterize the existence of abnormal discharge. If the abnormal discharge time in the target third discharge detection result and the target fourth discharge detection result is the same, the abnormal discharge information in the target third discharge detection result and the target fourth discharge detection result is combined to generate abnormal alarm information, and the abnormal alarm information is pushed; if the abnormal discharge time in the target third discharge detection result and the target fourth discharge detection result is different, the abnormal alarm information is generated according to the abnormal discharge information in the target third discharge detection result and the target fourth discharge detection result, and the abnormal alarm information is pushed.

[0175] The fifth step is to generate an abnormal discharge event report based on the first discharge detection result and the second discharge detection result characterizing the existence of abnormal discharge when the voltage of the boost device controlling the test device drops below the reference voltage. The abnormal discharge event report includes the abnormal discharge time, abnormal discharge type and abnormal discharge location.

[0176] In an exemplary embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as shown in FIG. Figure 8 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data such as sound signals, visible light images and reference images. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for locating and analyzing abnormalities in a withstand voltage test is implemented.

[0177] Those skilled in the art will understand that Figure 8 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0178] In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the steps in any one of the above-mentioned embodiments of the method for locating and analyzing abnormalities in a withstand voltage test are implemented.

[0179] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in any one of the above-mentioned embodiments of the method for locating and analyzing abnormalities in a withstand voltage test are implemented.

[0180] In one embodiment, a computer program product is provided, including a computer program, which, when executed by a processor, implements the steps in any one of the above-mentioned embodiments of the method for locating and analyzing abnormalities in a withstand voltage test.

[0181] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0182] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0183] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0184] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for locating and analyzing abnormalities in a withstand voltage test, characterized in that: The method comprises: When the voltage of the test equipment rises to and is maintained at the preset test high voltage, obtain the sound signal and visible light image of the area where the test equipment is located; Identify whether the sound signal has an abnormal signal, and obtain a first discharge detection result; Comparing the visible light image with a preset reference image, and detecting whether there is a glow signal in the area where the test equipment is located, to obtain an image comparison result and a glow signal detection result; Determine whether there is abnormal discharge based on the image comparison result and the glow signal detection result, and obtain a second discharge detection result; When the first discharge detection result and the second discharge detection result indicate that abnormal discharge exists, an abnormal discharge point is located according to the first discharge detection result and the second discharge detection result.

2. The method according to claim 1, characterized in that The locating the abnormal discharge point according to the first discharge detection result and the second discharge detection result comprises: Filtering out a target first discharge detection result and a target second discharge detection result having the same abnormal discharge time from the first discharge detection result and the second discharge detection result; If the abnormal discharge types of the target first discharge detection result and the target second discharge detection result are consistent, locating the abnormal discharge point based on the target first discharge detection result and the target second discharge detection result; If the abnormal discharge types of the target first discharge detection result and the target second discharge detection result are inconsistent, the abnormal discharge point is located based on the target second discharge detection result.

3. The method according to claim 1, characterized in that The sound signal includes an audible sound signal and an ultrasonic signal, and the identifying whether the sound signal has an abnormal signal to obtain a first discharge detection result includes: De-noising the audible sound signal and the ultrasonic signal by using a reference audible sound signal and a reference ultrasonic signal, wherein the reference audible sound signal and the reference ultrasonic signal are acquired when the voltage of the test device is at a preset reference voltage; In the case where at least one of the audible sound signal and the ultrasonic signal after denoising has an abnormal signal, determining the abnormal discharge type of the abnormal signal based on a preset abnormal discharge signal analysis strategy; Based on the abnormal signal, an abnormal discharge position is determined, and the first discharge detection result includes an abnormal discharge time, an abnormal discharge type, and an abnormal discharge position of the abnormal signal.

4. The method according to claim 3, characterized in that The determining of the abnormal discharge type of the abnormal signal based on the preset abnormal discharge signal analysis strategy includes: In the case where the audible sound signal and the ultrasonic signal both have steep wave signals, determining that the abnormal discharge type of the abnormal signal is gap discharge or surface discharge; When there is no abnormal signal in the audible sound signal and there is a periodic abnormal signal in the ultrasonic signal, determining that the abnormal discharge type of the abnormal signal is corona discharge; When the audible sound signal has a periodic abnormal signal and the ultrasonic signal has no abnormal signal, it is determined that the abnormal discharge type of the abnormal signal is a suspended discharge.

5. The method according to any one of claims 1 to 4, characterized in that: The determining whether there is abnormal discharge based on the image comparison result and the glow signal detection result to obtain a second discharge detection result includes: When the glow signal detection result indicates that a glow signal exists, and the image comparison result indicates that the similarity between the visible light image and the reference image is higher than a preset similarity threshold, determining that the abnormal discharge type of the visible light image is corona discharge; When the glow signal detection result indicates that there is no glow signal, and the image comparison result indicates that the similarity between the visible light image and the reference image is lower than the preset similarity threshold, determining that the abnormal discharge type of the visible light image is suspended discharge; When the glow signal detection result indicates the presence of a glow signal, and the image comparison result indicates that the similarity between the visible light image and the reference image is lower than the preset similarity threshold, the abnormal discharge type of the visible light image is determined to be gap discharge or surface discharge, and the second discharge detection result includes a visible light image collected at the moment when the glow signal is detected, and the abnormal discharge type of the visible light image.

6. The method according to any one of claims 1 to 4, characterized in that: The method further comprises: When the voltage of the test equipment is at a preset reference voltage, detecting whether there is a glow signal in the area where the test equipment is located, and obtaining a glow signal detection result; When the glow signal detection result indicates the presence of a glow signal, obtaining a target visible light image acquired at the time when the glow signal is detected, and determining that the target visible light image is an abnormal image; Based on the abnormal image, alarm information is generated and pushed.

7. A pressure test abnormality location analysis device, characterized in that: The device comprises: A data acquisition module, used to acquire sound signals and visible light images of the area where the test equipment is located when the voltage of the test equipment rises to and is maintained at a preset test high voltage; A first discharge detection module, used to identify whether the sound signal has an abnormal signal and obtain a first discharge detection result; A second discharge detection module is used to compare the visible light image with a preset reference image, and detect whether there is a glow signal in the area where the test equipment is located, to obtain an image comparison result and a glow signal detection result; based on the image comparison result and the glow signal detection result, it is determined whether there is an abnormal discharge, to obtain a second discharge detection result; The abnormality location analysis module is used to locate the abnormal discharge point according to the first discharge detection result and the second discharge detection result when the first discharge detection result and the second discharge detection result indicate the existence of abnormal discharge.

8. A pressure test abnormality location analysis system, characterized in that: The pressure test abnormality positioning and analysis system comprises a controller, a sound recognition system and an image recognition system, wherein the sound recognition system and the image recognition system are respectively connected to the controller for communication: The sound recognition system is used to collect sound signals in the area where the test equipment is located when the voltage of the test equipment rises to and is maintained at a preset test high voltage, identify whether the sound signals have abnormal signals, obtain a first discharge detection result, and send the first discharge detection result to the controller; The image recognition system is used to collect a visible light image of the area where the test equipment is located when the voltage of the test equipment rises to and is maintained at a preset test high voltage; compare the visible light image with a preset reference image, and detect whether there is a glow signal in the area where the test equipment is located, to obtain an image comparison result and a glow signal detection result, and determine whether there is abnormal discharge based on the image comparison result and the glow signal detection result, to obtain a second discharge detection result, and to send the second discharge detection result to the controller; The controller is used to receive the first discharge detection result and the second discharge detection result, and locate the abnormal discharge point according to the first discharge detection result and the second discharge detection result when the first discharge detection result and the second discharge detection result indicate the existence of abnormal discharge.

9. The system according to claim 8, characterized in that The sound recognition system is also used to perform denoising on the audible sound signal and the ultrasonic signal through a reference audible sound signal and a reference ultrasonic signal. The reference audible sound signal and the reference ultrasonic signal are acquired when the voltage of the test equipment is at a preset reference voltage. When an abnormal signal exists in at least one of the audible sound signal and the ultrasonic signal after denoising, the abnormal discharge type of the abnormal signal is determined based on a preset abnormal discharge signal analysis strategy, and the abnormal discharge position is determined based on the abnormal signal. The first discharge detection result includes the abnormal discharge time, abnormal discharge type and abnormal discharge position of the abnormal signal.

10. The system according to claim 9, characterized in that The controller is further configured to generate an abnormal discharge event report based on the first discharge detection result and the second discharge detection result when the first discharge detection result and the second discharge detection result indicate the presence of abnormal discharge, wherein the abnormal discharge event report includes an abnormal discharge time, an abnormal discharge type, and an abnormal discharge location.

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