High-voltage crosslinked cable production quality detection method

Abstract

The invention is applicable to the technical field of cable production quality detection, and particularly relates to a high-voltage crosslinked cable production quality detection method, which comprises the following steps: acquiring detection voltage and detection time; obtaining a standard pulse diagram; obtaining a pressurization rate; analyzing according to the pressurization rate, the detection time, the detection voltage and a standard pulse diagram to obtain an optimal detection voltage; analyzing according to the detection time, the optimal detection voltage and a standard pulse diagram to obtain the optimal detection time; and the control device controls the detection device to adjust the detection voltage to the optimal detection voltage and adjust the detection time to the optimal detection time. According to the high-voltage crosslinked cable production quality detection method provided by the invention, the quality detection can be performed on the cable in a targeted manner by adjusting the detection voltage and the detection time, so that the accuracy of the detection result of the quality detection of the cable is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of cable production quality detection, and in particular, relates to a method for detecting the production quality of high-voltage cross-linked cables. Background Art

[0002] The production of high-voltage cross-linked cables usually involves twisting conductor materials into multiple strands to form a conductor layer, then extruding cross-linked polyethylene material on the conductor layer to form an insulation layer, then weaving metal tape or wire on the insulation layer to form a metal shielding layer, and finally extruding composite materials such as polyvinyl chloride (PVC) or polyethylene (PE) on the metal shielding layer to form a protective sheath.

[0003] In the related art, the optimal detection conditions of the same type of cable may change due to problems with the cable production equipment or cable manufacturing materials. When the optimal detection conditions change, when the electrical performance test of the high-voltage cross-linked cable is performed, the set detection voltage may be greater than the optimal detection voltage, causing unnecessary damage to the cable. When the set detection voltage is less than the optimal detection voltage, it may lead to the inability to effectively detect all discharge phenomena of the cable, thereby failing to accurately detect the potential quality defects of the cable. It may also be because the set detection time is greater than the optimal detection time, causing the cable temperature to rise under high load conditions, thereby causing the cable insulation to decrease. When the set detection time is less than the optimal detection time, it may cause the cable to be unable to generate a stable electric field distribution, thereby failing to detect the potential quality defects of the cable. In summary, when the quality inspection of the same type of cable is performed, when the same detection conditions are used to inspect the quality of the cable, the quality inspection results of the cable will eventually be inaccurate or the cable will be damaged. Summary of the invention

[0004] The embodiment of the present application provides a method for testing the production quality of high-voltage cross-linked cables, which can improve the problem that when the quality of cables is tested under the same testing conditions, the quality test results of the cables will be inaccurate or the cables will be damaged.

[0005] In a first aspect, an embodiment of the present application provides a method for detecting the production quality of a high-voltage cross-linked cable, comprising: Obtaining a detection voltage and a detection time; wherein the detection voltage is used to reflect the detection voltage initially set for the cable, and the detection time is used to reflect the time initially set for detecting the cable under the detection voltage; Acquire a standard pulse diagram; wherein the standard pulse diagram is used to reflect the image of the pulse wave generated by the standard cable when the standard cable is tested at the test voltage and the test time; Acquire a voltage application rate; wherein the voltage application rate is used to reflect the speed at which the voltage increases when the cable is pressurized; Analyze the pressure rate, the detection time, the detection voltage and the standard pulse diagram to obtain an optimal detection voltage; wherein the optimal detection voltage is used to reflect the voltage of the cable after the cable is adjusted; Analyze the detection time, the optimal detection voltage and the standard pulse diagram to obtain the optimal detection time; wherein the optimal detection time is used to reflect the time for detecting the cable under the optimal detection voltage condition; The control device controls the detection device to adjust the detection voltage to the optimal detection voltage and adjust the detection time to the optimal detection time.

[0006] The above technical solutions in the embodiments of the present application have at least the following technical effects: The method for detecting the production quality of high-voltage cross-linked cables provided in the embodiment of the present application first obtains a detection voltage for reflecting the detection voltage initially set for the cable and a detection time for reflecting the time for detecting the cable under the detection voltage initially set, then obtains a standard pulse diagram for reflecting the image of the pulse wave generated under the detection voltage and the detection time, and then obtains a pressurization rate for reflecting the speed of increase of the voltage when the cable is pressurized, and then analyzes according to the pressurization rate, the detection time, the detection voltage and the standard pulse diagram to obtain an optimal detection voltage for reflecting the voltage detected on the cable after adjustment, and then analyzes according to the detection time, the optimal detection voltage and the standard pulse diagram to obtain an optimal detection time for reflecting the time for detecting the cable under the optimal detection voltage condition, and finally controls the detection device through the control device to adjust the detection voltage to the optimal detection voltage and the detection time to the optimal detection time.

[0007] This method can effectively obtain the optimal detection voltage and optimal detection time of the same cable in actual production, which may be different from the initially set detection voltage and detection current, based on the differences between multiple pulse diagrams obtained during the gradual pressurization of the cable and the standard pulse diagrams generated under the initial detection voltage and detection time. By adjusting the detection voltage and detection time, the cable quality inspection can be carried out in a targeted manner, thereby improving the accuracy of the detection results of the cable quality inspection.

[0008] In a possible implementation manner of the first aspect, the analyzing according to the pressurization rate, the detection time, the detection voltage, and the standard pulse diagram to obtain the optimal detection voltage includes: The pressurization rate, the detection time and the detection voltage are used as detection conditions to perform a slow pressurization detection on the cable, and a pulse atlas is obtained; wherein the pulse atlas is used to reflect a collection of multiple pulse diagrams of the cable within the detection voltage; The optimum detection voltage is obtained by analyzing the pressure increase rate, the pulse diagram set and the standard pulse diagram.

[0009] In a possible implementation manner of the first aspect, the analyzing according to the pressurization rate, the pulse graph set, and the standard pulse graph to obtain the optimal detection voltage includes: Processing is performed according to the pulse atlas to obtain an actual pulse diagram; wherein the actual pulse diagram is used to reflect the actual image of the pulse wave generated under the detection voltage and the detection time; Analyze the actual pulse diagram and the standard pulse diagram to obtain a phase angle difference; wherein the phase angle difference is used to reflect the difference in angular position between the first pulse in the pulse diagram and the first pulse in the standard pulse diagram; The optimum detection voltage is obtained by analyzing the pressurization rate, the phase angle difference, the pulse diagram set and the standard pulse diagram.

[0010] In a possible implementation manner of the first aspect, the analyzing the actual pulse diagram and the standard pulse diagram to obtain the phase angle difference includes: Analyze the actual pulse diagram to obtain a first phase angle; wherein the first phase angle is used to reflect the position of the first pulse in the actual pulse diagram; Analyze the standard pulse diagram to obtain a second phase angle; wherein the second phase angle is used to reflect the position of the first pulse in the standard pulse diagram; The first phase angle is compared with the second phase angle to obtain a phase angle difference; wherein the phase angle difference is used to reflect the difference between the first phase angle and the second phase angle.

[0011] In a possible implementation of the first aspect, the obtaining of the optimal detection voltage by analyzing the pressurization rate, the phase angle difference, the pulse graph set, and the standard pulse graph includes: When the phase angle difference is equal to 0, confirming the detection voltage as the optimal detection voltage; And / or, the analyzing according to the pressurization rate, the phase angle difference, the pulse diagram set and the standard pulse diagram to obtain the optimal detection voltage further includes: When the phase angle difference is less than 0, the pulse atlas is analyzed to obtain a plurality of first clarity, and the standard pulse atlas is analyzed to obtain a second clarity; wherein the first clarity is used to reflect the resolution of a plurality of pulse atlases within the detection voltage in the pulse atlas, and the second clarity is used to reflect the resolution of the standard pulse atlas; Analyze the second definition and the first definitions to obtain a matching time; wherein the matching time is used to reflect the time when the first definitions are the same as the second definition; An optimum detection voltage is obtained by analyzing the matching time and the pressure increase rate.

[0012] In a possible implementation manner of the first aspect, the obtaining of the optimal detection voltage by analyzing the pressurizing rate, the phase angle difference, the pulse graph set, and the standard pulse graph further includes: When the phase angle difference is greater than 0, a plurality of noise ratios and a plurality of pulse width ratios are obtained by analyzing the pulse atlas set and the standard pulse atlas; wherein the noise ratio is used to reflect the ratio between the noise power of the pulse atlas in the pulse atlas set and the noise power of the standard pulse atlas, and the pulse width ratio is used to reflect the ratio between the pulse duration width of the pulse atlas in the pulse atlas set and the pulse duration width in the standard pulse atlas; Analyzing the pressure rate to obtain a plurality of pressure voltages; wherein the pressure voltage is used to reflect the voltage value during the slow pressure process; Analyzing the plurality of noise ratios and the plurality of applied voltages to obtain a first analysis curve; wherein the first analysis curve is a curve used to reflect the change of the noise ratio with the change of the applied voltage; A second analysis curve is obtained by analyzing the plurality of pulse width ratios and the plurality of applied voltages; wherein the second analysis curve is used to reflect the curve of the pulse width ratio changing with the applied voltage; An optimum detection voltage is obtained by analyzing the first analysis curve and the second analysis curve.

[0013] In a possible implementation manner of the first aspect, the analyzing according to the first analysis curve and the second analysis curve to obtain the optimal detection voltage includes: Analyze the first analysis curve and the second analysis curve to obtain a third analysis curve; wherein the third analysis curve is used to reflect the relationship curve between the noise ratio and the pulse width ratio; Analyze according to the third analysis curve to obtain a normalized point; wherein the normalized point is used to reflect the data point in the third analysis curve where the pulse width ratio is 1 and the noise ratio is the smallest; An optimum detection voltage is obtained by analyzing the normalized point and the second analysis curve.

[0014] In a possible implementation manner of the first aspect, the analyzing according to the detection time, the optimal detection voltage, and the standard pulse diagram to obtain the optimal detection time includes: The control device controls the detection device to detect the cable based on the optimal detection voltage and the detection time, and obtains an optimal pulse diagram; wherein the optimal pulse diagram is used to reflect the image of the pulse wave generated by the cable when the cable is detected under the optimal detection voltage and the detection time; The optimal pulse diagram and the standard pulse diagram are analyzed to obtain a time ratio, wherein the time ratio is used to reflect the ratio between the time for the discharge amount of the cable to increase at the optimal detection voltage and the time for the discharge amount of the cable to increase at the detection voltage; An optimum detection time is obtained by analyzing the time ratio and the detection time.

[0015] In a possible implementation manner of the first aspect, analyzing the optimal pulse diagram and the standard pulse diagram to obtain the time ratio includes: Analyze the optimal pulse diagram to obtain a first climbing time; wherein the first climbing time is used to reflect the time occupied by the discharge increment in the optimal pulse diagram; Analyze the standard pulse diagram to obtain a second climbing time; wherein the second climbing time is used to reflect the time occupied by the discharge increment in the standard pulse diagram; The first climbing time is compared with the second climbing time to obtain a time ratio; wherein the time ratio is used to reflect the ratio between the first climbing time and the second climbing time.

[0016] In a possible implementation manner of the first aspect, analyzing the optimal pulse diagram to obtain the first climbing time includes: Analyze the optimal pulse diagram to obtain a first discharge amount change; wherein the first discharge amount change is used to reflect the change of the discharge increment of the cable under the optimal detection voltage; A first rising time is obtained by analyzing the first discharge amount change and the optimal pulse diagram; wherein the first rising time is used to reflect the time taken for the first discharge amount change to become 0 in the optimal pulse diagram.

[0017] And / or, analyzing the standard pulse diagram to obtain a second rise time includes: Analyze the standard pulse diagram to obtain a second discharge amount change; wherein the second discharge amount change is used to reflect the change of the discharge increment of the cable under the detection voltage in theory; A second rising time is obtained by analyzing the second discharge amount change and the standard pulse diagram; wherein the second rising time is used to reflect the time taken for the second discharge amount change to become 0 in the standard pulse diagram.

[0018] In a second aspect, an embodiment of the present application provides a high-voltage cross-linked cable production quality detection system, comprising: The first acquisition module is used to acquire the detection voltage and the detection time; wherein the detection voltage is used to reflect the detection voltage initially set for the cable, and the detection time is used to reflect the time for detecting the cable under the detection voltage initially set.

[0019] The second acquisition module is used to acquire a standard pulse diagram; wherein the standard pulse diagram is used to reflect the image of the pulse wave generated by the standard cable when the standard cable is tested under the test voltage and test time.

[0020] The third acquisition module is used to acquire the pressure increase rate; wherein the pressure increase rate is used to reflect the speed of increase of the voltage when the cable is pressurized.

[0021] The first analysis module is used to analyze the pressure rate, detection time, detection voltage and standard pulse diagram to obtain the best detection voltage; wherein the best detection voltage is used to reflect the voltage of the cable after the cable is adjusted; The second analysis module is used to analyze the detection time, the optimal detection voltage and the standard pulse diagram to obtain the optimal detection time; wherein the optimal detection time is used to reflect the time for detecting the cable under the optimal detection voltage condition; The control module is used to control the detection device to adjust the detection voltage to the optimal detection voltage and the detection time to the optimal detection time.

[0022] In the third aspect, an embodiment of the present application provides a high-voltage cross-linked cable production quality inspection device, comprising a detection device and a control device, wherein the detection device is electrically connected to the control device, and the control device comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the method described in any one of the first aspects above.

[0023] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method described in any one of the first aspects above is implemented.

[0024] In a fifth aspect, an embodiment of the present application provides a computer program, which, when executed on a high-voltage cross-linked cable production quality inspection device, enables the high-voltage cross-linked cable production quality inspection device to perform the high-voltage cross-linked cable production quality inspection method described in any one of the above-mentioned first aspects.

[0025] It can be understood that the beneficial effects of the second to fifth aspects mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art 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 drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 It is a flow chart of a method for detecting the production quality of a high-voltage cross-linked cable provided in one embodiment of the present application; Figure 2 It is a schematic diagram of the implementation process of a high-voltage cross-linked cable production quality detection method provided in an embodiment of the present application; Figure 3 It is a structural schematic diagram of a high-voltage cross-linked cable production quality detection system provided in one embodiment of the present application; Figure 4 It is a structural schematic diagram of a control device of a high-voltage cross-linked cable production quality inspection device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0028] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0029] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0030] It should also be understood that the term “and / or” used in the specification and appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0031] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]", depending on the context.

[0032] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0033] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0034] In the related art, the optimal detection conditions of the same type of cable may change due to problems with the cable production equipment or cable manufacturing materials. When the optimal detection conditions change, when the electrical performance test of the high-voltage cross-linked cable is performed, the set detection voltage may be greater than the optimal detection voltage, causing unnecessary damage to the cable. When the set detection voltage is less than the optimal detection voltage, it may lead to the inability to effectively detect all discharge phenomena of the cable, thereby failing to accurately detect the potential quality defects of the cable. It may also be because the set detection time is greater than the optimal detection time, causing the cable temperature to rise under high load conditions, thereby causing the cable insulation to decrease. When the set detection time is less than the optimal detection time, it may cause the cable to be unable to generate a stable electric field distribution, thereby failing to detect the potential quality defects of the cable. In summary, when the quality inspection of the same type of cable is performed, when the same detection conditions are used to inspect the quality of the cable, the quality inspection results of the cable will eventually be inaccurate or the cable will be damaged.

[0035] To solve the above problems, the embodiment of the present application provides a method for detecting the production quality of high-voltage cross-linked cables. In the method, first, by obtaining a detection voltage for reflecting the detection voltage of the cable initially set and a detection time for reflecting the time of detecting the cable under the detection voltage initially set, then by obtaining a standard pulse diagram for reflecting the image of the pulse wave generated under the detection voltage and the detection time, then obtaining a pressurization rate for reflecting the speed of increase of the voltage when the cable is pressurized, and then analyzing according to the pressurization rate, the detection time, the detection voltage and the standard pulse diagram, obtaining an optimal detection voltage for reflecting the voltage of the cable after the cable is adjusted, and then analyzing according to the detection time, the optimal detection voltage and the standard pulse diagram, obtaining an optimal detection time for reflecting the time of detecting the cable under the optimal detection voltage condition, and finally controlling the detection device through the control device to adjust the detection voltage to the optimal detection voltage and the detection time to the optimal detection time.

[0036] The high-voltage cross-linked cable production quality inspection method provided in the embodiment of the present application can be applied to a high-voltage cross-linked cable production quality inspection equipment. At this time, the high-voltage cross-linked cable production quality inspection equipment is the executor of the high-voltage cross-linked cable production quality inspection method provided in the embodiment of the present application. The embodiment of the present application does not impose any restrictions on the specific type of terminal equipment.

[0037] The high-voltage cross-linked cable quality detection equipment includes a detection device and a control device, and the detection device is electrically connected to the control device. The detection device is used to detect the quality of the high-voltage cross-linked cable. The detection device includes an oscilloscope, a pressure device and a timing device. The oscilloscope is used to obtain a pulse diagram when the high-voltage cross-linked cable is detected. For example, the oscilloscope can be a digital storage oscilloscope, a pulse generator or a partial discharge detector, etc. The pressure device is used to apply a detection voltage to the high-voltage cross-linked cable. The pressure device can be an AC power supply or a programmable power supply, etc. The timing device is used to time the detection time of the high-voltage cross-linked cable. The timing device can be an electronic timer, a digital timer or a mechanical clock, etc. The control device is used to supervise and control the detection process of the high-voltage cross-linked cable.

[0038] For example, the control device can be a mobile phone, a tablet computer, a laptop computer, an ultra-mobile personal computer (UMPC), a netbook, a smart large screen, a smart TV, a handheld device with wireless communication function, a desktop computer, a handheld device with wireless communication function, a computer, a laptop computer, a handheld computing device, etc.

[0039] In order to better understand the high-voltage cross-linked cable production quality detection method provided in the embodiment of the present application, the specific implementation process of the high-voltage cross-linked cable production quality detection method provided in the embodiment of the present application is exemplarily introduced below.

[0040] Figure 1 and Figure 2 A schematic flow chart showing a method for detecting the production quality of a high-voltage cross-linked cable provided in an embodiment of the present application is shown. Figure 1 and Figure 2 , the production quality inspection methods for high-voltage cross-linked cables include: S100, obtaining a detection voltage and a detection time; wherein the detection voltage is used to reflect the detection voltage initially set for the cable, and the detection time is used to reflect the time for detecting the cable under the detection voltage initially set.

[0041] It can be understood that the detection voltage refers to the voltage that is initially set to be most suitable for quality inspection of standard cables. The detection time refers to the detection time that is initially set to be most suitable for the detection voltage. Standard cables refer to cables produced when the material structure, production method, cable production equipment, etc. are all in production expectations during the production process. Because the use scenarios of cables are different, the electrical performance requirements of cables are also different, so different cable models correspond to different detection conditions. In the process of quality inspection of cables, it is usually necessary to inspect the cables under pre-set detection conditions, and the detection conditions include detection conditions and detection time. Exemplarily, the detection voltage and detection time can be obtained by manual input. The detection voltage and detection time can also be directly obtained through the detection database. The detection database refers to a database containing cables of different models and corresponding detection voltages and detection times. These data can be obtained through laboratory experiments, on-site measurements and monitoring, and previous experience. After obtaining, the collected data will be sorted, classified and archived, useful information and rules will be extracted, and the relevant data will be saved in the database to form a detection database.

[0042] S200, obtaining a standard pulse diagram; wherein the standard pulse diagram is used to reflect an image of a pulse wave generated by a standard cable when the standard cable is tested under a test voltage and a test time.

[0043] For example, the pulse signal of the standard cable under the detection voltage and detection time can be simulated by simulation software (such as MATLAB, Simulink), and the pulse signal can be imaged by a drawing function (such as plot) to generate a standard pulse diagram. Signal imaging processing refers to the process of converting a pulse signal into an image or graphic representation. The process of signal imaging processing can be steps such as signal acquisition, feature extraction, and image generation.

[0044] S300, obtaining a voltage application rate; wherein the voltage application rate is used to reflect the speed at which the voltage increases when the cable is pressurized.

[0045] It can be understood that in the process of testing the cable, it is necessary to pressurize the cable at a pressurization rate to avoid damage to the cable during the testing process due to excessively fast voltage growth. Exemplarily, the pressurization rate can be manually input, and the pressurization rate can also be directly obtained through the voltage rate library. The voltage rate library refers to a database containing pressurization rates. These data can be obtained through laboratory experiments, on-site measurements and monitoring, and past experience. After obtaining, the collected data will be sorted, classified and archived, useful information and rules will be extracted, and the relevant data will be saved in the database to form a voltage rate library.

[0046] S400, analyzing the pressure rate, the detection time, the detection voltage and the standard pulse diagram to obtain an optimal detection voltage; wherein the optimal detection voltage is used to reflect the voltage of the cable after the cable is adjusted.

[0047] It is understandable that in the actual cable manufacturing process, the optimal testing conditions of the same type of cable may change due to problems with the cable production equipment or cable manufacturing materials. The optimal testing voltage refers to the voltage that is most suitable for testing the current cable after adjustment. The optimal testing conditions refer to the testing conditions that can best reflect the discharge phenomenon of the cable when testing the current cable production quality.

[0048] Exemplarily, the cable can be processed at a pressurization rate, a detection voltage, and a detection time to obtain a set of multiple pulse graphs of the cable within the detection voltage, and then the set of multiple pulse graphs of the cable within the detection voltage is analyzed together with the pressurization rate and the standard pulse graph to finally obtain the optimal detection voltage.

[0049] The optimal detection voltage can also be obtained through the detection model, that is, the pressure rate, detection time, detection voltage and standard pulse diagram are input into the detection model, and the detection model then outputs the corresponding optimal detection voltage. The training process of the detection model can be performed by processing the pressure rate, detection time, detection voltage and standard pulse diagram and the corresponding optimal detection voltage as the training data set of the detection model, and then the training data set of the detection model is input into the detection model for training and learning, and finally the detection model is obtained.

[0050] In a possible implementation, in step S400, the optimal detection voltage is obtained by analyzing the pressure increase rate, the detection time, the detection voltage and the standard pulse diagram, including: S410, using the pressurization rate, detection time and detection voltage as detection conditions to perform a slow pressurization test on the cable, and obtain a pulse atlas; wherein the pulse atlas is used to reflect a collection of multiple pulse graphs of the cable within the detection voltage.

[0051] It can be understood that slow pressurization refers to the process of pressurizing the cable at a pressurization rate, from zero volts to the detection voltage. The pulse atlas refers to the sum of the pulse diagrams corresponding to different voltages during the process of slowly pressurizing the cable. The pulse atlas is a collection of pulse diagrams obtained in real time during the process of slowly pressurizing the cable. Exemplarily, during the process of testing the standard cable under the detection voltage and detection time, an oscilloscope can be connected to the standard cable to detect the change of the pulse in real time to obtain a pulse diagram, and the obtained pulse diagram can be saved in image form or other formats (such as CSV, TXT, etc.) to obtain a pulse atlas.

[0052] S420, analyzing the pressure rate, the pulse diagram set and the standard pulse diagram to obtain the optimal detection voltage.

[0053] For example, the pulse atlas can be analyzed to obtain an actual image reflecting the pulse wave generated by the cable under the detection voltage and detection time. The actual image is analyzed with the standard pulse diagram to obtain the difference in the angular position of the first pulse between the actual image and the standard image. Finally, the optimal detection voltage is obtained based on the pressure rate, the difference in angular position, the pulse atlas and the standard pulse diagram.

[0054] The optimal detection voltage can also be obtained through the detection voltage model, that is, the voltage application rate, pulse atlas and standard pulse diagram are input into the detection voltage model, and the detection voltage model then outputs the corresponding optimal detection voltage. The training process of the detection voltage model can be performed by processing the voltage application rate, pulse atlas and standard pulse diagram and the corresponding optimal detection voltage as the training data set of the detection voltage model, and then the training data set of the detection voltage model is input into the detection voltage model for training and learning, and finally the detection voltage model is obtained.

[0055] With this setting, through the slow pressure test, multiple pulse diagrams generated by the cable under different pressure conditions can be obtained, thus forming a pulse diagram set, which can improve the comprehensive understanding of the cable response characteristics. According to the comparative analysis of the pulse diagram set and the standard pulse diagram, the detection voltage can be dynamically adjusted to ensure that the cable test is carried out at the optimal detection voltage and optimize the detection effect.

[0056] In a possible implementation, in step S420, analyzing the pressure rate, the pulse graph set and the standard pulse graph to obtain the optimal detection voltage includes: S421, processing is performed according to the pulse atlas to obtain an actual pulse diagram; wherein the actual pulse diagram is used to reflect the actual image of the pulse wave generated under the detection voltage and detection time.

[0057] It can be understood that the pulse atlas is the sum of the pulse graphs generated by the current cable within the range of zero volt voltage and the detection voltage. Exemplarily, the actual pulse graph can be obtained by performing feature extraction on the pulse atlas. The feature extraction process can be to use the detection voltage as a feature and extract the pulse graph under the detection voltage from the pulse atlas, which is the actual pulse graph.

[0058] S422, analyzing the actual pulse diagram and the standard pulse diagram to obtain a phase angle difference; wherein the phase angle difference is used to reflect the difference in angular position between the first pulse in the pulse diagram and the first pulse in the standard pulse diagram.

[0059] It can be understood that the phase angle difference refers to the difference between the phase angle of the first pulse in the pulse sequence of the actual pulse diagram and the phase angle of the first pulse in the pulse sequence of the standard pulse diagram. The pulse sequence refers to the order in which the pulse signals are arranged according to the law of time length. Because the detection voltage in the optimal detection condition changes, the phase angle of the first pulse in the actual pulse diagram is offset compared to the phase angle of the first pulse in the standard pulse diagram.

[0060] Exemplarily, the actual pulse diagram can be analyzed to obtain the position of the first pulse in the pulse sequence of the actual pulse diagram, and then the standard pulse diagram can be analyzed to obtain the position of the first pulse in the pulse sequence of the standard pulse diagram, and the phase angle difference can be obtained by comparing the position of the first pulse in the actual pulse diagram with the position of the first pulse in the standard pulse diagram.

[0061] It is also possible to perform Fourier transformation on the pulse signal in the actual pulse diagram to obtain the spectrum of the actual pulse diagram, extract features from the spectrum, obtain the main frequency component of the actual pulse diagram, and analyze it according to the spectrum diagram to obtain the phase angle of the actual pulse diagram. Similarly, perform Fourier transformation on the pulse signal in the standard pulse diagram to obtain the phase angle of the standard pulse diagram, and finally calculate the difference between the phase angle of the actual pulse diagram and the phase angle of the standard pulse diagram to obtain the phase angle difference. Fourier transformation refers to the process of converting a pulse signal from the time domain to the frequency domain.

[0062] In a possible implementation, in step S422, the phase angle difference is obtained by analyzing the actual pulse diagram and the standard pulse diagram, including: S4221, analyzing the actual pulse diagram to obtain a first phase angle; wherein the first phase angle is used to reflect the position of the first pulse in the actual pulse diagram.

[0063] It can be understood that in the process of using an AC system to detect cables, by aligning the phase angle of the pulse signal with the phase of the power supply voltage, the time when the pulse signal generated by the discharge phenomenon in the cable occurs can be captured more accurately. The phase angle can be represented by the angle of the corresponding power supply voltage, which can more conveniently describe the time position of the first pulse in the pulse sequence. The actual pulse diagram can be analyzed to obtain the first pulse in the actual pulse diagram, and then the first pulse and the actual pulse diagram are analyzed to obtain the position of the first pulse in the actual pulse diagram, which is the first phase angle. For example, if the first pulse in the actual pulse diagram appears at 30ms, and the first pulse appears at an angle of 85° at the corresponding power supply voltage, then the first phase angle is 85°, and so on.

[0064] S4222, analyzing the standard pulse diagram to obtain a second phase angle; wherein the second phase angle is used to reflect the position of the first pulse in the standard pulse diagram.

[0065] The first pulse in the standard pulse diagram can be obtained by analyzing the standard pulse diagram, and then the first pulse and the standard pulse diagram can be analyzed to obtain the position of the first pulse in the standard pulse diagram at the time of its appearance, which is the second phase angle. For example, if the first pulse in the standard pulse diagram appears at 35ms, and the angle of the corresponding power supply voltage when the first pulse appears is 88°, then the second phase angle is 88°, and so on.

[0066] S4223, comparing the first phase angle with the second phase angle to obtain a phase angle difference; wherein the phase angle difference is used to reflect the difference between the first phase angle and the second phase angle.

[0067] The phase angle difference can be obtained by performing a difference operation on the first phase angle and the second phase angle. Phase angle difference = first phase angle - second phase angle. For example, if the first phase angle is 85° and the second phase angle is 88°, the phase angle difference is -3 (85°-88°)°, if the first phase angle is 90° and the second phase angle is 86°, the phase angle difference is 4 (90°-86°)°, and so on.

[0068] In this way, the first phase angle reflects the position of the first pulse in the actual pulse diagram, and the second phase angle reflects the position of the first pulse in the standard pulse diagram. This helps to instantly evaluate the cable status. By comparing the phase angle difference obtained by the first phase angle and the second phase angle, the difference between the two pulse diagrams can be accurately quantified, providing data support for subsequent detection steps.

[0069] S423, analyzing the pressure rate, phase angle difference, pulse diagram set and standard pulse diagram to obtain the optimal detection voltage.

[0070] It can be understood that when the positive and negative nature of the phase angle difference is judged, the offset direction of the optimal detection voltage is obtained. The offset direction means that when the optimal detection voltage is compared with the pre-set detection voltage, the detection voltage needs to be increased or decreased to achieve the optimal detection voltage. When the phase angle difference is a positive number, it means that the detection voltage is small, and the detection voltage needs to be increased to the optimal detection voltage. When the phase angle difference is a negative number, it means that the detection voltage is large, and the detection voltage needs to be reduced to the optimal detection voltage. When the phase angle difference is 0, it means that the optimal detection voltage is the same as the detection voltage, and there is no need to adjust the detection voltage. Under the optimal detection voltage, the discharge phenomenon generated by the cable increases comprehensively, which eventually causes the area occupied by the first pulse in the acquired pulse diagram to shift. The optimal detection voltage can be obtained by judging the sign of the phase angle, and then analyzing the judgment results of the sign judgment of the phase angle through the pressurization rate, pulse atlas and standard pulse diagram in different steps. The optimal detection voltage can also be obtained through the deduction model, that is, the pressure rate, phase angle difference, pulse atlas and standard pulse diagram are input into the deduction model, and the deduction model outputs the corresponding optimal detection voltage. The training process of the deduction model can be performed by processing the pressure rate, phase angle difference, pulse atlas and standard pulse diagram and the corresponding optimal detection voltage as the training data set of the deduction model, and then the training data set of the deduction model is input into the deduction model for training and learning, and finally the deduction model is obtained.

[0071] This setting helps to timely detect discharge phenomena inside the cable through the analysis of phase angle difference, improve the ability of early warning of cable quality defects, and thus reduce potential risks and failures. The evaluation of phase angle difference can also provide more details for the detection process, reduce the test errors caused by changes in voltage conditions, and improve the consistency of detection.

[0072] In a possible implementation, in step S423, the optimal detection voltage is obtained by analyzing the pressure rate, the phase angle difference, the pulse diagram set and the standard pulse diagram, including: S4231, when the phase angle difference is equal to 0, confirm the detection voltage as the optimal detection voltage.

[0073] It can be understood that when the phase angle difference is equal to 0, it can be explained that the first pulse in the actual pulse diagram and the first pulse in the standard pulse diagram arrive at the same time, which means that the optimal detection voltage is equal to the detection voltage. There is no need to adjust the detection voltage.

[0074] S4232, when the phase angle difference is less than 0, the pulse atlas is analyzed to obtain multiple first clarity, and the standard pulse atlas is analyzed to obtain the second clarity; wherein the first clarity is used to reflect the resolution size of multiple pulse atlases within the detection voltage in the pulse atlas, and the second clarity is used to reflect the resolution size of the standard pulse atlas.

[0075] It can be understood that when the phase angle difference is less than 0, it can be said that the first pulse in the actual pulse diagram arrives earlier than the first pulse in the standard pulse diagram, which means that the optimal detection voltage is lower than the detection voltage. Each pulse diagram corresponds to a clarity. The pulse diagram in the pulse diagram set can be analyzed by the analysis function of the oscilloscope (such as waveform measurement, FFT analysis, etc.) to obtain the signal-to-noise ratio of the pulse diagram, and then the signal-to-noise ratio of the pulse diagram is matched with the preset clarity interval to obtain the first clarity. Similarly, the signal-to-noise ratio of the standard pulse diagram can be obtained by analyzing the standard pulse diagram, and then the signal-to-noise ratio of the standard pulse diagram is matched with the preset clarity interval to obtain the second clarity. The signal-to-noise ratio refers to the ratio of signal power to noise power. Noise power refers to the intensity of random noise outside the signal. Signal power refers to the average power of the effective signal content in the pulse diagram. The noise power can be obtained by integrating the part of the pulse diagram without obvious signal. The signal power can be obtained by integrating the peak value in the pulse diagram whose amplitude is significantly higher than the noise. The preset clarity interval refers to a pre-set interval. The preset standard interval includes multiple clarity, where each clarity corresponds to a signal-to-noise ratio. The preset clarity interval can be manually input or directly obtained through the clarity database. The clarity database refers to a database containing different signal-to-noise ratios and corresponding clarity. These data can be obtained through laboratory experiments, on-site measurements and monitoring, and past experience. After obtaining the data, the collected data will be sorted, classified and archived, useful information and rules will be extracted, and the relevant data will be saved in the database to form a clarity database.

[0076] For example, if the preset clarity interval is (0, 10), the signal-to-noise ratio corresponding to 0 in the preset clarity interval is 1, the signal-to-noise ratio corresponding to 1 in the preset clarity interval is 2, the signal-to-noise ratio corresponding to 2 in the preset clarity interval is 4, the signal-to-noise ratio corresponding to 5 in the preset clarity interval is 8, and the signal-to-noise ratio corresponding to 10 in the preset clarity interval is 20. When the signal-to-noise ratio is 20, the corresponding clarity is 10, and when the signal-to-noise ratio is 5, the corresponding clarity is 8, and so on.

[0077] S4233, analyzing the second definition and the plurality of first definitions to obtain a matching time; wherein the matching time is used to reflect the time when the plurality of first definitions are the same as the second definition.

[0078] It can be understood that because the optimal detection voltage is lower than the detection voltage, it can be explained that there is a clarity value equal to the second clarity among the multiple first clarity. Because the first clarity changes with the voltage change during the pressurization process, when the value of the changed first clarity is the same as the value of the second clarity, the signal-to-noise ratio in the pulse diagram of the initially set voltage (detection voltage) that is most suitable for detecting the standard cable and the voltage (optimal detection voltage) that is most suitable for detecting the current cable after adjustment can be matched to obtain the change time corresponding to the first clarity when the clarity is the same, that is, the matching time. The matching time can be obtained through a timer.

[0079] S4234, analyzing the matching time and the pressure rate to obtain the optimal detection voltage.

[0080] It can be understood that the optimal detection voltage = matching time × pressurization rate. For example, if the matching time is 3 minutes and the pressurization rate is 100 kV / min, the optimal detection voltage is 300 kV, if the matching time is 5 minutes and the pressurization rate is 34 kV / min, the optimal detection voltage is 170 kV, and so on.

[0081] With this setting, the offset direction of the optimal detection voltage is determined by the sign of the phase angle difference, so that different processing steps can be formulated to better target different situations and more comprehensively determine the value of the optimal detection voltage. By using the clarity matching method, the situation where the optimal detection voltage is smaller than the detection voltage can be analyzed more quickly.

[0082] In a possible implementation, in step S423, the optimal detection voltage is obtained by analyzing the pressure rate, the phase angle difference, the pulse diagram set and the standard pulse diagram, and further comprising: S4234, when the phase angle difference is greater than 0, analyze the pulse atlas set and the standard pulse atlas to obtain multiple noise ratios and multiple pulse width ratios; wherein the noise ratio is used to reflect the ratio between the noise power of the pulse diagram in the pulse atlas set and the noise power of the standard pulse diagram, and the pulse width ratio is used to reflect the ratio between the pulse duration width of the pulse diagram in the pulse atlas set and the pulse duration width in the standard pulse diagram.

[0083] It can be understood that when the phase angle difference is greater than 0, it can be explained that the first pulse in the actual pulse diagram arrives later than the first pulse in the standard pulse diagram, which means that the optimal detection voltage is higher than the detection voltage. The pulse width refers to the time length of the significant pulse peak in the pulse diagram.

[0084] Noise ratio = first noise power ÷ second noise power, where the first noise power refers to the noise power of the pulse graph in the pulse graph set, and the second noise power refers to the noise power of the standard pulse graph. The noise powers of multiple pulse graphs can be obtained by analyzing the pulse graphs in the pulse graph set, and then the standard pulse graph can be analyzed to obtain the noise power of the standard pulse graph. Finally, the noise power of the standard pulse graph can be compared with the noise power of multiple pulse graphs one by one to finally obtain multiple noise ratios.

[0085] Pulse width ratio = first pulse width ÷ second pulse width, where the first pulse width refers to the pulse width of the pulse graph in the pulse graph set, and the second pulse width refers to the pulse width of the standard pulse graph. The pulse widths of multiple pulse graphs can be obtained by analyzing the pulse graphs in the pulse graph set, and then the pulse width of the standard pulse graph can be obtained by analyzing the standard pulse graph. Finally, the pulse width of the standard pulse graph is compared with the pulse widths of multiple pulse graphs one by one, and finally multiple pulse width ratios are obtained. The pulse width refers to the length of time occupied by the peak value in the pulse graph whose amplitude is significantly higher than the noise.

[0086] S4235, analyzing according to the pressurization rate to obtain a plurality of pressurization voltages; wherein the pressurization voltage is used to reflect the voltage value during the slow pressurization process.

[0087] The formula can be Obtain multiple applied voltages, where i is a positive integer greater than 0, is the applied voltage, is the pressurization rate, Refers to the time point of the ith time period. For example, if the voltage application rate is 50 kV / min, the voltage application at the 3rd minute is 150 kV, the voltage application at the 4th minute is 200 kV, and so on.

[0088] S4236, analyzing the multiple noise ratios and the multiple applied voltages to obtain a first analysis curve; wherein the first analysis curve is a curve used to reflect the change of the noise ratio with the change of the applied voltage.

[0089] Exemplarily, multiple noise ratios can be matched one by one with multiple applied voltages to obtain multiple noise data points, and then model analysis can be performed through multiple data points, and a suitable mathematical model can be selected to establish a relationship between the noise ratio and the applied voltage, so as to obtain a first analysis curve. By preprocessing multiple noise data points, data noise, data outliers or data missing values ​​in multiple noise data points can be eliminated. It can ensure that the availability and accuracy of multiple noise data points used before analyzing and constructing the first analysis curve meet the standards. Then, by sorting multiple noise data points, the sorting method can be sorted by the size of the applied voltage. Then, by using an interpolation method (such as linear, cubic or spline interpolation) to estimate the point value between the given multiple noise data points. It helps to create a continuous and smooth curve from relatively discrete data in multiple noise data points. Multiple noise data points can be fitted to a suitable curve, and various curve fitting techniques (such as least squares regression or polynomial fitting) can be used to find the best fitting curve that can appropriately represent the first analysis curve. The noise data point is a data point with the applied voltage as the horizontal coordinate and the noise ratio as the vertical coordinate.

[0090] S4237, analyzing the multiple pulse width ratios and the multiple applied voltages to obtain a second analysis curve; wherein the second analysis curve is a curve used to reflect the change of the pulse width ratio with the change of the applied voltage.

[0091] Exemplarily, multiple pulse width ratios can be matched one by one with multiple applied voltages to obtain multiple width data points. By sorting the multiple width data points, the width data points can be sorted in a specific order according to the relevant parameters of the width data points (e.g., the magnitude of the applied voltage). Then, by drawing a scatter plot of the multiple width data points, the point values ​​between the multiple width data points in the drawn scatter plot are estimated by using an interpolation method (such as linear, cubic or spline interpolation). It helps to create a continuous and smooth curve from a relatively discrete scatter plot. Finally, by fitting a suitable curve to the width data points, various curve fitting techniques (such as least squares regression or polynomial fitting) can be used to find the best fitting curve that can appropriately represent the two analysis curves. The two analysis curves are analyzed to determine relevant features, such as the roughness, slope and radius of the two analysis curves. These features can be used to characterize the two analysis curves and evaluate the curve quality of the two analysis curves. The width data points are data points with the applied voltage as the horizontal coordinate and the pulse width ratio as the vertical coordinate.

[0092] S4238, analyzing the first analysis curve and the second analysis curve to obtain an optimal detection voltage.

[0093] By processing the first analysis curve and the second analysis curve, a curve reflecting the relationship between the noise ratio and the pulse width ratio can be obtained. Then, by analyzing the relationship curve between the noise ratio and the pulse width ratio, a data point in the curve with a pulse width ratio of 1 and a minimum noise ratio can be obtained. Then, by analyzing the data point with a pulse width ratio of 1 and a minimum noise ratio with the second analysis curve, an optimal detection voltage can be obtained.

[0094] The first analysis curve and the second analysis curve can also be analyzed to obtain a joint function, and then the joint function can be used for analysis to obtain a voltage that makes the pulse width ratio equal to 1 and minimizes the noise ratio in the joint function, and the voltage can be confirmed as the optimal detection voltage. The joint function refers to the combination of the first analysis curve and the second analysis curve. For example, if the first analysis curve is ,in, is the noise ratio, is the applied voltage. The second analysis curve is ,in is the pulse width ratio, is the applied voltage, then the joint function is .

[0095] With such a setting, the offset direction of the optimal detection voltage is determined by the sign of the phase angle difference, so that different processing steps can be formulated to better target different situations and more comprehensively determine the value of the optimal detection voltage. The optimal detection voltage can be obtained by using the third analysis curve obtained by using the noise ratio and the pulse width ratio. The detection voltage can be better analogized to the optimal detection voltage to provide a more accurate minimum detection voltage.

[0096] In a possible implementation, in step S4238, analyzing the first analysis curve and the second analysis curve to obtain the optimal detection voltage includes: S42381, analyzing the first analysis curve and the second analysis curve to obtain a third analysis curve; wherein the third analysis curve is used to reflect the relationship curve between the noise ratio and the pulse width ratio.

[0097] It can be understood that the third analysis curve uses the noise ratio as the horizontal coordinate and the pulse width ratio as the vertical coordinate. The third analysis curve can be obtained by combining the first analysis curve with the second analysis curve. The process of combining the curves can be to eliminate the applied voltage using the elimination method. The elimination method refers to eliminating one or more variables in multiple equations through algebraic operations. For example, if the first analysis curve is , the second analysis curve is , where k, a, b are constants and V is the applied voltage, then the third analysis curve is , and so on.

[0098] S42382, analyzing according to the third analysis curve to obtain a normalization point; wherein the normalization point is used to reflect the data point in the third analysis curve where the pulse width ratio is 1 and the noise ratio is the smallest.

[0099] It can be understood that when the pulse width ratio is 1, it means that the pulse width of the pulse image in the pulse atlas is equal to the pulse width of the standard pulse image, which can indicate that the pulse signal of the pulse image in the pulse atlas is relatively best matched with the background noise of the pulse image in the pulse atlas. And the noise ratio reaches the lowest point, at which time the intensity of the pulse signal reflected by the pulse atlas is the strongest relative to the noise. The data point with the smallest horizontal coordinate when the vertical coordinate is 1 can be obtained through the third analysis curve analysis, that is, the normalization point.

[0100] S42383, analyzing based on the normalization point and the second analysis curve to obtain the optimal detection voltage.

[0101] It can be understood that the horizontal coordinate of the normalized point is the noise ratio, and the vertical coordinate is the pulse width ratio. The optimal detection voltage can be directly obtained by substituting the vertical coordinate of the normalized point into the second analysis curve. The optimal detection voltage can also be directly obtained by substituting the horizontal coordinate of the normalized point into the first analysis curve.

[0102] With this setting, the condition corresponding to the normalization point provides a scientific basis for the optimal detection voltage sought by the detection system, so that the detection process can make full use of the optimal detection voltage, enhance the sensitivity and responsiveness of the system, and draw conclusions by analyzing the curve, making the optimization of the detection voltage more scientific and rigorous, reducing the uncertainty caused by the use of empirical decisions.

[0103] S500, analyzing the detection time, the optimal detection voltage and the standard pulse diagram to obtain the optimal detection time; wherein the optimal detection time is used to reflect the time for detecting the cable under the optimal detection voltage condition.

[0104] Exemplarily, the cable can be processed using an optimal detection voltage and detection time to obtain an image of the pulse wave generated by the cable when the cable is detected under the optimal detection voltage and detection time. The obtained pulse wave image is then analyzed with the standard pulse diagram to obtain the ratio of the time it takes for the cable's discharge amount to rise under the optimal detection voltage to the time it takes for the cable's discharge amount to rise under the detection voltage. Finally, the ratio is analyzed with the detection time to ultimately obtain the optimal detection time.

[0105] The optimal detection time can also be obtained through the analysis model, that is, the detection time, the optimal detection voltage and the standard pulse diagram are input into the analysis model, and the analysis model then outputs the corresponding optimal detection time. The training process of the analysis model can be performed by using the data processed from the detection time, the optimal detection voltage and the standard pulse diagram and the corresponding optimal detection time as the training data set of the analysis model, and then the training data set of the analysis model is input into the analysis model for training and learning, and finally the analysis model is obtained.

[0106] In a possible implementation, in step S500, analyzing the detection time, the optimal detection voltage and the standard pulse diagram to obtain the optimal detection time includes: S510, the control device controls the detection device to detect the cable based on the optimal detection voltage and detection time, and obtains the optimal pulse diagram; wherein the optimal pulse diagram is used to reflect the image of the pulse wave generated by the cable when the cable is detected under the optimal detection voltage and detection time.

[0107] It can be understood that the detection process can be to use the optimal detection voltage as the pressure voltage and the detection time as the continuous application time of the pressure voltage. During the process of testing the cable at the optimal detection voltage and detection time, an oscilloscope can be connected to the cable to detect the change of the pulse in real time to obtain the optimal pulse diagram.

[0108] S520, analyzing the optimal pulse diagram and the standard pulse diagram to obtain a time ratio; wherein the time ratio is used to reflect the ratio between the time for the discharge amount of the cable to increase at the optimal detection voltage and the time for the discharge amount of the cable to increase at the detection voltage.

[0109] It can be understood that during the detection of the cable, when the applied voltage is close to the optimal detection voltage, the initial discharge amount is usually relatively low. When the applied voltage reaches the optimal detection voltage, the discharge amount will show a more obvious increase. The discharge amount climbing time is the duration of the discharge amount obviously increasing when the applied voltage reaches the optimal detection voltage.

[0110] The time occupied by the change of pulse amplitude in the optimal pulse diagram can be analyzed as the time for the discharge amount of the cable to rise under the optimal detection voltage. The time for the discharge amount of the cable to rise under the optimal detection voltage can also be obtained by analyzing the pulse frequency in the optimal pulse diagram. The pulse frequency refers to the number of pulses observed within the preset observation time. The preset observation time refers to the pre-set time period for observing the number of pulses in the pulse diagram, which is used to regularly observe, process and analyze data to obtain the pulse frequency. The preset observation time can be manually input, and the preset observation time can also be directly obtained by analyzing the cycle database. The observation time database refers to a database containing observation times at different settings. These data can be obtained through laboratory experiments, on-site measurements and monitoring, and previous experience. After obtaining, the collected data will be sorted, classified and archived, useful information and rules will be extracted, and the relevant data will be saved in the database to form an observation time database.

[0111] Similarly, the time occupied by the change of pulse amplitude in the standard pulse diagram can be analyzed as the time when the discharge amount of the cable rises under the detection voltage. The time when the discharge amount of the cable rises under the detection voltage can also be obtained by analyzing the pulse frequency in the standard pulse diagram.

[0112] In a possible implementation, in step S520, analyzing the optimal pulse diagram and the standard pulse diagram to obtain the time ratio includes: S521, analyzing the best pulse diagram to obtain a first climbing time; wherein the first climbing time is used to reflect the time occupied by the discharge increment in the best pulse diagram.

[0113] It can be understood that the discharge increment refers to the increase in the partial discharge. The change in the discharge increment of the cable at the optimal detection voltage can be obtained by analyzing the optimal pulse diagram, and then the timestamp when the change in the discharge increment of the cable at the optimal detection voltage in the optimal pulse diagram becomes 0 is used as the first climbing time. The timestamp refers to information containing time, which can be accurate to time units such as seconds and milliseconds.

[0114] It is also possible to analyze the preset threshold and the best pulse diagram, identify the obvious rising part from the best pulse diagram, and obtain the time required from the pulse signal to reach the preset threshold from the best pulse diagram, which is the first climbing time. The preset threshold refers to the value of the preset discharge increment. The preset threshold can be manually input, or it can be directly obtained through the threshold database. The threshold database refers to a database containing discharge increments at different settings. These data can be obtained through laboratory experiments, on-site measurements and monitoring, and past experience. After obtaining, the collected data will be sorted, classified and archived, useful information and rules will be extracted, and the relevant data will be saved in the database to form a threshold database.

[0115] In a possible implementation, in step S521, the best pulse diagram is analyzed to obtain a first climbing time, including: S5211, analyzing the optimal pulse diagram to obtain a first discharge amount change; wherein the first discharge amount change is used to reflect the change in the discharge increment of the cable at the optimal detection voltage.

[0116] It can be understood that the integral of the graph of the best pulse graph over time is the first discharge amount. The graph of the best pulse graph can be integrated to obtain the value of the discharge amount, and then the value of the discharge amount obtained by the integration process is analyzed with the timestamp corresponding to the best pulse graph to obtain the first discharge amount change. Integration processing refers to integrating the numerical value represented by the best pulse graph to obtain the discharge amount. The first discharge amount refers to the discharge amount reflected by the best pulse graph.

[0117] S5212, analyzing the first discharge amount change and the optimal pulse diagram to obtain a first rising time; wherein the first rising time is used to reflect the time taken for the first discharge amount change to become 0 in the optimal pulse diagram.

[0118] The time when the first discharge amount changes to 0 can be analyzed, and the time corresponding to the best pulse diagram can be marked. Then, the marked best pulse diagram can be analyzed to confirm the time period from when the pulse signal amplitude in the best pulse diagram starts to change until it becomes 0 as the first climbing time.

[0119] With this setting, dynamic information of the cable discharge process is provided through analysis of the first rise time, which can reflect the response speed of the cable to voltage changes and better help evaluate the electrical performance of the cable. By analyzing when the discharge amount change in the optimal pulse diagram returns to zero, the critical performance of the cable can be better understood and the optimal detection time of the cable can be determined.

[0120] S522, analyzing the standard pulse diagram to obtain a second rising time; wherein the second rising time is used to reflect the time occupied by the discharge increment in the standard pulse diagram.

[0121] The change of the discharge increment of the cable under the detection voltage can be obtained by analyzing the standard pulse diagram, and then the timestamp when the change of the discharge increment of the cable under the detection voltage in the standard pulse diagram becomes 0 can be used as the second climbing time.

[0122] It is also possible to analyze the preset threshold and the standard pulse diagram, identify the obvious rising part from the standard pulse diagram, and obtain the time required from the pulse signal starting to rise until reaching the preset threshold from the standard pulse diagram, which is the second climbing time. The preset threshold can be manually input or directly obtained from the threshold database.

[0123] In a possible implementation, in step S522, the standard pulse diagram is analyzed to obtain the second climbing time, including: S5221, analyzing the standard pulse diagram to obtain a second discharge amount change; wherein the second discharge amount change is used to reflect the change in the discharge increment of the cable under the detection voltage in theory.

[0124] It can be understood that the integral of the graph of the standard pulse graph over time is the second discharge amount. The value of the second discharge amount can be obtained by integrating the graph of the standard pulse graph, and then the value of the second discharge amount obtained by the integration process is analyzed with the timestamp corresponding to the standard pulse graph to obtain the second discharge amount change. The second discharge amount refers to the discharge amount reflected by the standard pulse graph.

[0125] S5222, analyzing the second discharge amount change and the standard pulse diagram to obtain a second climbing time; wherein the second climbing time is used to reflect the time taken for the second discharge amount change to become 0 in the standard pulse diagram.

[0126] The time when the second discharge amount changes to 0 can be analyzed, and the corresponding time of the standard pulse diagram can be marked. Then, the marked standard pulse diagram can be analyzed to confirm the time period from when the pulse signal amplitude in the standard pulse diagram starts to change until it becomes 0 as the second climbing time.

[0127] With this setting, dynamic information of the cable discharge process is provided through analysis of the second climbing time, which can reflect the response speed of the cable to voltage changes and better help evaluate the electrical performance of the cable. By analyzing when the discharge amount change in the optimal pulse diagram returns to zero, the critical performance of the cable can be better understood and the optimal detection time of the cable can be determined.

[0128] S523: Compare the first climbing time with the second climbing time to obtain a time ratio; wherein the time ratio is used to reflect the ratio between the first climbing time and the second climbing time.

[0129] It can be understood that the time ratio = first rise time ÷ second rise time. For example, if the first rise time is 20ms and the second rise time is 40ms, the time ratio is 1 / 2 (20ms ÷ 40ms), if the first rise time is 50ms and the second rise time is 25ms, the time ratio is 2 (50ms ÷ 25ms), and so on.

[0130] In this way, by measuring the discharge rise time of the pulse diagram, it is helpful to reduce the error caused by signal noise or other influencing factors and improve the reliability of the detection results. Then, the difference is reflected by the time ratio, which provides an effective quantitative means for cable performance evaluation. This method can not only improve the accuracy of cable detection, but also provide important support for fault warning, health monitoring and optimization of detection methods.

[0131] S530, analyzing the time ratio and the detection time to obtain an optimal detection time.

[0132] It can be understood that the optimal detection time = time ratio × detection time. For example, if the time ratio is 1 / 2 and the detection time is 6 minutes, the optimal detection time is 3 (1 / 2 × 6 minutes) minutes, if the time ratio is 2 and the detection time is 3 minutes, the optimal detection time is 6 minutes (2 × 3 minutes) minutes, and so on.

[0133] With such a setting, the time ratio obtained by analyzing the optimal pulse diagram and the standard pulse diagram can better determine the optimal detection time, avoid errors caused by inappropriate detection time, and improve the reliability and consistency of detection.

[0134] S600, the control device controls the detection device to adjust the detection voltage to an optimal detection voltage, and adjusts the detection time to an optimal detection time.

[0135] It can be understood that the control device is used to supervise and control the detection process of the high-voltage cross-linked cable. The detection device is a device used to detect the quality of the high-voltage cross-linked cable.

[0136] For example, if the detection voltage is 250kV, the detection time is 5 minutes, the optimal detection voltage is 260kv, and the detection time is 6 minutes, then the detection voltage of 250kV in the detection conditions is adjusted to 260KV, and the detection time of 5 minutes in the detection conditions is adjusted to 6 minutes, and so on.

[0137] With this setting, by analyzing the standard pulse diagram, detection voltage and detection time, the cable status can be reflected more accurately, and false alarms or missed detections can be reduced. By obtaining the best detection voltage and the best detection time, the accuracy of the detection results can be improved, and the characteristics of different cables can be adapted when testing the same type of cables. The detection conditions can be dynamically adjusted according to the parameters and characteristics of different types of cables, making the detection equipment more adaptable and flexible, and applicable to different types of cable detection.

[0138] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0139] Corresponding to the high-voltage cross-linked cable production quality inspection method described in the above embodiment, the embodiment of the present application also provides a high-voltage cross-linked cable production quality inspection system, and each module of the high-voltage cross-linked cable production quality inspection system can implement each step of the high-voltage cross-linked cable production quality inspection method. Figure 3 A structural block diagram of a high-voltage cross-linked cable production quality detection system provided in an embodiment of the present application is shown. For ease of explanation, only the parts related to the embodiment of the present application are shown.

[0140] Reference Figure 3 , the high voltage cross-linked cable production quality inspection system includes: The first acquisition module is used to acquire the detection voltage and the detection time; wherein the detection voltage is used to reflect the detection voltage initially set for the cable, and the detection time is used to reflect the time for detecting the cable under the detection voltage initially set.

[0141] The second acquisition module is used to acquire a standard pulse diagram; wherein the standard pulse diagram is used to reflect the image of the pulse wave generated by the standard cable when the standard cable is tested under the test voltage and test time.

[0142] The third acquisition module is used to acquire the pressure increase rate; wherein the pressure increase rate is used to reflect the speed of increase of the voltage when the cable is pressurized.

[0143] The first analysis module is used to analyze the pressure rate, detection time, detection voltage and standard pulse diagram to obtain the best detection voltage; wherein the best detection voltage is used to reflect the voltage of the cable after the cable is adjusted.

[0144] The second analysis module is used to analyze the detection time, the optimal detection voltage and the standard pulse diagram to obtain the optimal detection time; wherein the optimal detection time is used to reflect the time for detecting the cable under the optimal detection voltage condition.

[0145] The control module is used to control the detection device to adjust the detection voltage to the optimal detection voltage and the detection time to the optimal detection time.

[0146] It should be noted that the information interaction, execution process and other contents between the above-mentioned modules are based on the same concept as the method embodiment of the present application. Their specific functions and technical effects can be found in the method embodiment part and will not be repeated here.

[0147] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the system can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0148] The present application also provides a high-voltage cross-linked cable production quality detection device, including a detection device and a control device, wherein the detection device is electrically connected to the control device. Figure 4 This is a schematic diagram of the structure of a control device 4 provided in an embodiment of the present application. Figure 4 As shown, the control device 4 of this embodiment includes: at least one processor 40 ( Figure 4 Only one is shown), at least one memory 41 ( Figure 4 Only one is shown in the figure) and a computer program 42 stored in the at least one memory 41 and executable on the at least one processor 40. When the processor 40 executes the computer program 42, the control device 4 implements the steps in any of the above-mentioned embodiments of the high-voltage cross-linked cable production quality detection method, or the control device 4 implements the functions of the modules in the above-mentioned system embodiments.

[0149] Exemplarily, the computer program 42 may be divided into one or more modules, which are stored in the memory 41 and executed by the processor 40 to complete the present application. The one or more modules may be a series of computer program instruction segments capable of completing specific functions, which are used to describe the execution process of the computer program 42 in the control device 4.

[0150] The control device 4 may be a computing device such as a desktop computer, a notebook, a palm computer, etc. The control device 4 may include, but is not limited to, a processor 40 and a memory 41. Those skilled in the art will understand that Figure 4 It is only an example of the control device 4 and does not constitute a limitation on the control device 4. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, it may also include input and output devices, network access devices, buses, etc.

[0151] The processor 40 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0152] In some embodiments, the memory 41 may be an internal storage unit of the control device 4, such as a hard disk or memory of the control device 4. In other embodiments, the memory 41 may also be an external storage device of the control device 4, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the control device 4. Further, the memory 41 may also include both an internal storage unit and an external storage device of the control device 4. The memory 41 is used to store an operating system, an application program, a boot loader (BootLoader), data, and other programs, such as the program code of the computer program. The memory 41 may also be used to temporarily store data that has been output or is to be output.

[0153] An embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps in any of the above method embodiments are implemented.

[0154] An embodiment of the present application provides a computer program product. When the computer program product is run on a high-voltage cross-linked cable production quality inspection device, the high-voltage cross-linked cable production quality inspection device implements the steps in any of the above-mentioned method embodiments.

[0155] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. According to this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, which can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the above-mentioned method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium can at least include: any entity or device that can carry the computer program code to the high-voltage cross-link cable production quality inspection equipment, recording medium, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal and software distribution medium. For example, a USB flash drive, a mobile hard disk, a disk or an optical disk.

[0156] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0157] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0158] In the embodiments provided in the present application, it should be understood that the disclosed high-voltage cross-linked cable production quality detection system and equipment can be implemented in other ways. For example, the above-described high-voltage cross-linked cable production quality detection system embodiment is only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0159] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0160] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A method for detecting the production quality of a high-voltage cross-linked cable, characterized in that: include: Obtaining a detection voltage and a detection time; wherein the detection voltage is used to reflect the detection voltage initially set for the cable, and the detection time is used to reflect the time initially set for detecting the cable under the detection voltage; Acquire a standard pulse diagram; wherein the standard pulse diagram is used to reflect the image of the pulse wave generated by the standard cable when the standard cable is tested at the test voltage and the test time; Acquire a voltage application rate; wherein the voltage application rate is used to reflect the speed at which the voltage increases when the cable is pressurized; Analyze the pressure rate, the detection time, the detection voltage and the standard pulse diagram to obtain an optimal detection voltage; wherein the optimal detection voltage is used to reflect the voltage of the cable after the cable is adjusted; Analyze the detection time, the optimal detection voltage and the standard pulse diagram to obtain the optimal detection time; wherein the optimal detection time is used to reflect the time for detecting the cable under the optimal detection voltage condition; The control device controls the detection device to adjust the detection voltage to the optimal detection voltage and adjust the detection time to the optimal detection time.

2. The high-voltage cross-linked cable production quality detection method according to claim 1, characterized in that: The analyzing the pressurization rate, the detection time, the detection voltage and the standard pulse diagram to obtain the optimal detection voltage includes: The pressurization rate, the detection time and the detection voltage are used as detection conditions to perform a slow pressurization detection on the cable, and a pulse atlas is obtained; wherein the pulse atlas is used to reflect a collection of multiple pulse diagrams of the cable within the detection voltage; The optimum detection voltage is obtained by analyzing the pressure increase rate, the pulse diagram set and the standard pulse diagram.

3. The high voltage cross-linked cable production quality detection method according to claim 2, characterized in that: The step of analyzing the pressure increase rate, the pulse graph set, and the standard pulse graph to obtain the optimal detection voltage includes: Processing is performed according to the pulse atlas to obtain an actual pulse diagram; wherein the actual pulse diagram is used to reflect the actual image of the pulse wave generated under the detection voltage and the detection time; Analyze the actual pulse diagram and the standard pulse diagram to obtain a phase angle difference; wherein the phase angle difference is used to reflect the difference in angular position between the first pulse in the pulse diagram and the first pulse in the standard pulse diagram; The optimum detection voltage is obtained by analyzing the pressurization rate, the phase angle difference, the pulse diagram set and the standard pulse diagram.

4. The high-voltage cross-linked cable production quality detection method according to claim 3, characterized in that: The step of analyzing the actual pulse diagram and the standard pulse diagram to obtain a phase angle difference includes: Analyze the actual pulse diagram to obtain a first phase angle; wherein the first phase angle is used to reflect the position of the first pulse in the actual pulse diagram; Analyze the standard pulse diagram to obtain a second phase angle; wherein the second phase angle is used to reflect the position of the first pulse in the standard pulse diagram; The first phase angle is compared with the second phase angle to obtain a phase angle difference; wherein the phase angle difference is used to reflect the difference between the first phase angle and the second phase angle.

5. The high-voltage cross-linked cable production quality detection method according to claim 3, characterized in that: The step of analyzing the pressure increase rate, the phase angle difference, the pulse diagram set and the standard pulse diagram to obtain the optimal detection voltage includes: When the phase angle difference is equal to 0, confirming the detection voltage as the optimal detection voltage; And / or, the analyzing according to the pressurization rate, the phase angle difference, the pulse diagram set and the standard pulse diagram to obtain the optimal detection voltage further includes: When the phase angle difference is less than 0, the pulse atlas is analyzed to obtain a plurality of first clarity, and the standard pulse atlas is analyzed to obtain a second clarity; wherein the first clarity is used to reflect the resolution of a plurality of pulse atlases within the detection voltage in the pulse atlas, and the second clarity is used to reflect the resolution of the standard pulse atlas; Analyze the second definition and the first definitions to obtain a matching time; wherein the matching time is used to reflect the time when the first definitions are the same as the second definition; An optimum detection voltage is obtained by analyzing the matching time and the pressure increase rate.

6. The high-voltage cross-linked cable production quality detection method according to claim 3, characterized in that: The analyzing according to the pressurizing rate, the phase angle difference, the pulse diagram set and the standard pulse diagram to obtain the optimal detection voltage also includes: When the phase angle difference is greater than 0, a plurality of noise ratios and a plurality of pulse width ratios are obtained by analyzing the pulse atlas set and the standard pulse atlas; wherein the noise ratio is used to reflect the ratio between the noise power of the pulse atlas in the pulse atlas set and the noise power of the standard pulse atlas, and the pulse width ratio is used to reflect the ratio between the pulse duration width of the pulse atlas in the pulse atlas set and the pulse duration width in the standard pulse atlas; Analyzing the pressure rate to obtain a plurality of pressure voltages; wherein the pressure voltage is used to reflect the voltage value during the slow pressure process; Analyzing the plurality of noise ratios and the plurality of applied voltages to obtain a first analysis curve; wherein the first analysis curve is a curve used to reflect the change of the noise ratio with the change of the applied voltage; A second analysis curve is obtained by analyzing the plurality of pulse width ratios and the plurality of applied voltages; wherein the second analysis curve is used to reflect the curve of the pulse width ratio changing with the applied voltage; An optimum detection voltage is obtained by analyzing the first analysis curve and the second analysis curve.

7. The method for detecting the production quality of a high-voltage cross-linked cable according to claim 6, characterized in that: The step of analyzing the first analysis curve and the second analysis curve to obtain an optimal detection voltage includes: Analyze the first analysis curve and the second analysis curve to obtain a third analysis curve; wherein the third analysis curve is used to reflect the relationship curve between the noise ratio and the pulse width ratio; Analyze according to the third analysis curve to obtain a normalized point; wherein the normalized point is used to reflect the data point in the third analysis curve where the pulse width ratio is 1 and the noise ratio is the smallest; An optimum detection voltage is obtained by analyzing the normalized point and the second analysis curve.

8. The high voltage cross-linked cable production quality detection method according to claim 1, characterized in that: The analyzing the detection time, the optimal detection voltage and the standard pulse diagram to obtain the optimal detection time includes: The control device controls the detection device to detect the cable based on the optimal detection voltage and the detection time, and obtains an optimal pulse diagram; wherein the optimal pulse diagram is used to reflect the image of the pulse wave generated by the cable when the cable is detected under the optimal detection voltage and the detection time; The optimal pulse diagram and the standard pulse diagram are analyzed to obtain a time ratio, wherein the time ratio is used to reflect the ratio between the time for the discharge amount of the cable to increase at the optimal detection voltage and the time for the discharge amount of the cable to increase at the detection voltage; An optimum detection time is obtained by analyzing the time ratio and the detection time.

9. The method for detecting the production quality of a high-voltage cross-linked cable according to claim 8, characterized in that: The step of analyzing the optimal pulse diagram and the standard pulse diagram to obtain the time ratio includes: Analyze the optimal pulse diagram to obtain a first climbing time; wherein the first climbing time is used to reflect the time occupied by the discharge increment in the optimal pulse diagram; Analyze the standard pulse diagram to obtain a second climbing time; wherein the second climbing time is used to reflect the time occupied by the discharge increment in the standard pulse diagram; The first climbing time is compared with the second climbing time to obtain a time ratio; wherein the time ratio is used to reflect the ratio between the first climbing time and the second climbing time.

10. The method for detecting the production quality of a high-voltage cross-linked cable according to claim 9, characterized in that: The step of analyzing the optimal pulse diagram to obtain a first rising time includes: Analyze the optimal pulse diagram to obtain a first discharge amount change; wherein the first discharge amount change is used to reflect the change of the discharge increment of the cable under the optimal detection voltage; Analyzing the first discharge amount change and the optimal pulse diagram, obtaining a first climbing time; wherein the first climbing time is used to reflect the time taken for the first discharge amount change to become 0 in the optimal pulse diagram; And / or, analyzing the standard pulse diagram to obtain a second rise time includes: Analyze the standard pulse diagram to obtain a second discharge amount change; wherein the second discharge amount change is used to reflect the change of the discharge increment of the cable under the detection voltage in theory; A second rising time is obtained by analyzing the second discharge amount change and the standard pulse diagram; wherein the second rising time is used to reflect the time taken for the second discharge amount change to become 0 in the standard pulse diagram.

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