Calibration method and system of cable fault tester, medium and product

Abstract

The invention discloses a cable fault tester calibration method and system, a medium and a product, and relates to the field of power equipment detection, and the method comprises the steps: setting a target simulation fault distance and a pulse signal propagation speed; theoretical delay time is calculated, and a control instruction is generated; configuring a calibration mode corresponding to one test function of the to-be-calibrated cable fault tester based on the control instruction; according to the configured calibration mode, performing corresponding signal interaction with a cable fault tester to simulate a standard fault signal under a test function; obtaining a measured distance calculated by the cable fault tester based on the signal interaction result; according to the target simulation fault distance and the measured distance, the distance measurement error of the cable fault tester under the corresponding test function is determined, the time delay of a cable fault point reflection signal is accurately simulated in a digital program control mode, and accurate, flexible and automatic calibration of the distance measurement function of the calibrated cable fault tester is achieved.

Description

Technical Field

[0001] This application relates to the field of power equipment testing technology, and in particular to a calibration method, system, medium and product for a cable fault tester. Background Technology

[0002] Cable fault testers are crucial equipment for detecting and locating faults in power cables. Their measurement accuracy directly impacts fault diagnosis efficiency and power system safety. Previously, cable fault tester calibration typically involved verifying the tester's capabilities using physical cables: for example, a test range of 20m–30km, a resolution of 0.1m, and an accuracy of ±(0.5% × measurement length L + 1m). Often, only a single 300–500m cable could be used for simple verification. Since a single real cable corresponds to only one length, it's impossible to verify whether the test range fully covers the fault location, and accuracy can only be measured at one point. Detecting multiple points requires cutting cables of various lengths for verification, leading to excessive costs, cumbersome operations, and low efficiency. Alternatively, circuits composed of capacitors and inductors could be used to simulate cable characteristics and fault distance, but this approach is complex, the accuracy of simulated length parameters is difficult to control, and it cannot flexibly and accurately simulate arbitrary fault distances. Summary of the Invention

[0003] The purpose of this application is to provide a calibration method, system, medium, and product for a cable fault tester, which accurately simulates the time delay of the reflected signal at the cable fault point in a digitally programmed manner, thereby replacing the physical cable or analog circuit and realizing accurate, flexible, and automated calibration of the ranging function of the cable fault tester being calibrated.

[0004] To achieve the above objectives, this application provides the following solution: In a first aspect, this application provides a calibration method for a cable fault tester, comprising: setting a target simulated fault distance and pulse signal propagation speed; The theoretical delay time is calculated based on the simulated fault distance of the target and the propagation speed of the pulse signal, and control commands are generated. The control command is configured to a calibration mode corresponding to a test function of the cable fault tester to be calibrated; wherein the calibration mode includes at least one of the following: low-voltage pulse method calibration mode, high-voltage flashover method calibration mode, and multiple pulse method calibration mode. Start the test function of the cable fault tester; According to the configured calibration mode, corresponding signal interaction is performed with the cable fault tester to simulate the standard fault signal under the test function; The measured distance is obtained by the cable fault tester based on the signal interaction results. Based on the target simulated fault distance and the measured distance, the distance measurement error of the cable fault tester under the corresponding test function is determined.

[0005] Optionally, in the low-voltage pulse calibration mode, the signal interaction includes: The low-voltage pulse signal emitted by the cable fault tester under the test function is detected. After detecting the low-voltage pulse signal, and after the theoretical delay time, a low-voltage pulse signal is returned to the cable fault tester. In the low-voltage pulse calibration mode, the method by which the cable fault tester calculates the measured distance based on the signal interaction results includes: The cable fault tester calculates the measured distance by measuring the time interval between the low-voltage pulse signal it emits and the low-voltage pulse signal it receives, and by combining this with the propagation speed set within the cable fault tester.

[0006] Optionally, in the high-voltage flashover calibration mode, the signal interaction specifically includes: According to the control command, two high-voltage pulse signals are sent sequentially to the cable fault tester which is in a waiting trigger state, and the time interval between the two high-voltage pulse signals is equal to the theoretical delay time. In the high-voltage flashover calibration mode, the method by which the cable fault tester calculates the measured distance based on the signal interaction results includes: The cable fault tester calculates the measured distance by measuring the time interval between two received high-voltage pulse signals and combining this with the propagation speed set within the cable fault tester.

[0007] Optionally, in the multi-pulse calibration mode, the signal interaction includes: According to the control command, two high-voltage pulse signals with a time interval equal to the theoretical delay time are sent to the cable fault tester; After receiving two high-voltage pulse signals, the cable fault tester sends a low-voltage pulse signal. After receiving the low-voltage pulse signal from the cable fault tester, and after the theoretical delay time, a low-voltage pulse signal is returned to the cable fault tester. In the multi-pulse calibration mode, the method by which the cable fault tester calculates the measured distance based on the signal interaction results includes: The cable fault tester processes the high-voltage pulse signal and the low-voltage pulse signal, and calculates the measured distance based on the propagation speed set inside the cable fault tester.

[0008] Optionally, the calibration method for the cable fault tester further includes: By changing the target simulated fault distance and repeating the steps described above, the cable fault tester can be calibrated at multiple distance points under the same or different test functions and across the entire range.

[0009] Secondly, this application provides a calibration system for a cable fault tester, comprising: The PC computer is used to set the target simulated fault distance and pulse signal propagation speed, generate control commands, and obtain the measured distance calculated by the cable fault tester based on the signal interaction results. Based on the target simulated fault distance and the measured distance, the PC computer determines the distance measurement error of the cable fault tester under the corresponding test function. The signal detection and generator host is used to communicate with the PC computer, and is configured to a calibration mode corresponding to a test function of the cable fault tester to be calibrated based on the control command, and to perform corresponding signal interaction with the cable fault tester according to the configured calibration mode to simulate the standard fault signal under the test function. A connection interface is located on the outside of the signal detection and generator host. The connection interface is used to connect to the cable fault tester to be calibrated for pulse signal transmission.

[0010] Optionally, the signal detection and generator host includes: A power supply module, which provides power to the various modules of the signal detection and generator host; A control and communication module, which is used to communicate with a PC computer and parse the control commands; A pulse signal detection module, which is used to detect and capture the pulse signal emitted by the cable fault tester; A pulse signal generating module, wherein the pulse signal generating module is used to generate pulse signals; The control and communication module coordinates the working timing of the pulse signal detection module and the pulse signal generation module according to the parsed instructions.

[0011] Optionally, the signal detection and generator host further includes: A programmable delay module is provided, which is used to implement a precise delay after the pulse signal is detected by the pulse signal detection section, wherein the delay duration is determined by the control command. The mode switching module is used to switch between calibration modes corresponding to the low-voltage pulse method, the high-voltage flashover method, or the multiple pulse method according to the control command.

[0012] Thirdly, this application provides a computer device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the calibration method for the cable fault tester as described in any one of the first aspects.

[0013] Fourthly, this application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the calibration method for the cable fault tester described in any one of the first aspects.

[0014] Fifthly, this application provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the calibration method for the cable fault tester described in any one of the first aspects.

[0015] According to the specific embodiments provided in this application, the following technical effects are disclosed: This application provides a calibration method, system, medium, and product for a cable fault tester. By directly setting the target distance and propagation speed, calibration points can be continuously and arbitrarily set within the measurement range of the cable fault tester, completely overcoming the drawbacks of traditional methods that rely on finite length physical cables, resulting in incomplete range coverage and sparse calibration points. The spatial distance (meters) is converted into a precise time delay (microseconds) through a deterministic algorithm, giving the calibration benchmark digital accuracy and avoiding errors introduced by the drift of passive analog circuit parameters. By configuring a calibration mode based on the control command corresponding to a test function of the cable fault tester, different calibration modes such as low-voltage pulse method, high-voltage flashover method, or multiple pulse method can be flexibly switched, realizing integrated calibration of multiple core test functions of the cable fault tester, replacing the cumbersome operation that previously required multiple devices or solutions. The calibration mode is configured to interact with the cable fault tester via corresponding signals. This instrument simulates standard fault signals under the aforementioned testing function. It can accurately simulate standard reflection waveforms at any fault point from near to far distances (e.g., 10cm to 100km) according to control commands. Key parameters such as signal amplitude, width, and delay can be precisely set by software, overcoming the fundamental limitation of traditional methods that cannot perform continuous, arbitrary-point calibration across the entire range. By acquiring the measured distance calculated by the cable fault tester based on the signal interaction results, it eliminates human reading errors and calculation errors in the traditional calibration process, while improving computational efficiency. Furthermore, it allows calibration results to be directly recorded, stored, and reported digitally, providing a reliable data foundation for the metrological management, status tracking, and quality control of the cable fault tester. By directly comparing the standard set value with the measured value of the cable fault tester, it can automatically and quantitatively provide the measurement error, which can be compared with the allowable error in industry standards, providing a clear and reliable basis for evaluating the instrument's metrological performance. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic flowchart illustrating a calibration method for a cable fault tester provided in an embodiment of this application; Figure 2 A schematic diagram illustrating the working principle of the low-voltage pulse method provided in an embodiment of this application; Figure 3 A schematic diagram illustrating the working principle of the high-voltage flashover method provided in an embodiment of this application; Figure 4 A schematic diagram illustrating the working principle of the multi-pulse method provided in an embodiment of this application; Figure 5 A schematic diagram of the functional modules of a calibration system for a cable fault tester provided in an embodiment of this application; Figure 6 A schematic diagram illustrating the working principle of a calibration system for a cable fault tester, provided in one embodiment of this application; Figure 7 for Figure 5 A detailed functional module diagram of the signal detection and generator host in the calibration system of the cable fault tester; Figure 8 An electrical schematic diagram of a calibration system for a cable fault tester provided in one embodiment of this application; Figure 9 This is a schematic diagram of the structure of a computer device provided in an embodiment of this application. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] In one exemplary embodiment, such as Figure 1 As shown, a calibration method for a cable fault tester is provided, comprising the following steps 101 to 107, wherein: Step 101: Set the target simulated fault distance and pulse signal propagation speed; wherein, the pulse signal includes at least one of the following: open circuit fault characteristic signal, short circuit fault characteristic signal, and low resistance fault characteristic signal; Step 102: Calculate the theoretical delay time based on the target simulated fault distance and the pulse signal propagation speed, and generate control commands; Step 103: Configure a calibration mode based on the control command, corresponding to a test function of the cable fault tester to be calibrated; wherein the calibration mode includes at least one of the following: low-voltage pulse method calibration mode, high-voltage flashover method calibration mode, and multiple pulse method calibration mode. Step 104: Activate the testing function of the cable fault tester; Step 105: According to the configured calibration mode, perform corresponding signal interaction with the cable fault tester to simulate the standard fault signal under the test function; Step 106: Obtain the measured distance calculated by the cable fault tester based on the signal interaction results; Step 107: Based on the target simulated fault distance and the measured distance, determine the distance measurement error of the cable fault tester under the corresponding test function.

[0021] By implementing steps 101 to 107 above, and by directly setting the target distance and propagation speed, calibration points can be continuously and arbitrarily set within the range of the cable fault tester (e.g., 10m to 100km), completely overcoming the drawbacks of traditional methods that rely on finite-length physical cables, resulting in incomplete range coverage and sparse calibration points. The spatial distance (meters) is converted into a precise time delay (microseconds) through a deterministic algorithm, giving the calibration benchmark digital accuracy and avoiding errors introduced by the drift of passive analog circuit parameters. By configuring the calibration mode based on the control command to correspond to a test function of the cable fault tester to be calibrated, different calibration modes such as low-voltage pulse method, high-voltage flashover method, or multiple pulse method can be flexibly switched, realizing integrated calibration of multiple core test functions of the cable fault tester, replacing the cumbersome operation that previously required multiple devices or solutions. By interacting with the cable fault tester according to the configured calibration mode, the test function can be simulated. The standard fault signal can accurately simulate the standard reflection waveform of any fault point from near to far (e.g., 10cm to 100km) according to control commands. Key parameters such as signal amplitude, width, and delay can be precisely set by software, solving the fundamental deficiency of traditional methods that cannot perform continuous, arbitrary-point calibration across the entire range. By obtaining the measured distance calculated by the cable fault tester based on the signal interaction results, it eliminates human reading errors and calculation errors in the traditional calibration process, while improving calculation efficiency. Furthermore, it allows calibration results to be directly recorded, stored, and reported digitally, providing a reliable data foundation for the metrological management, status tracking, and quality control of the cable fault tester. By directly comparing the standard set value with the measured value of the cable fault tester, it can automatically and quantitatively provide the measurement error, which can be compared with the allowable error of industry standards (e.g., JJF(Mechanical)1042-2020), providing a clear and reliable basis for the metrological performance evaluation of the instrument.

[0022] In this embodiment, the calibration method for the cable fault tester is performed by a calibration system. The host computer control unit of the calibration system sets the target simulated fault distance L and pulse propagation speed V; calculates the theoretical delay time T=L / V and generates control commands; the signal detection and generator host of the calibration system is configured to a calibration mode corresponding to a certain test function of the instrument to be calibrated according to the control commands; the cable fault tester is started; the signal detection and generator host interacts with the cable fault tester using specific signals according to the selected calibration mode; the cable fault tester receives the signal, measures the pulse time interval, and calculates the measured distance L' based on its internal preset speed V'; finally, L' is compared with L to determine the distance measurement error and complete the accuracy assessment.

[0023] As an optional implementation, in the low-voltage pulse calibration mode, the signal interaction includes: The low-voltage pulse signal emitted by the cable fault tester under the test function is detected. After detecting the low-voltage pulse signal, and after the theoretical delay time, a low-voltage pulse signal is returned to the cable fault tester. In the low-voltage pulse calibration mode, the method by which the cable fault tester calculates the measured distance based on the signal interaction results includes: The cable fault tester calculates the measured distance by measuring the time interval between the low-voltage pulse signal it emits and the low-voltage pulse signal it receives, and by combining this with the propagation speed set within the cable fault tester.

[0024] In the embodiments of this application, see Figure 2 The signal detection of the calibration system and the generator host (i.e. Figure 2 The calibration source signal generator (the host in the middle) detects the low-voltage pulse signal (including open circuit fault characteristic signal, short circuit fault characteristic signal, and low resistance fault characteristic signal) emitted by the cable fault tester; and after detecting the low-voltage pulse signal, the signal processing host starts the internal delay and returns a low-voltage pulse signal to the cable fault tester after the theoretical delay time.

[0025] In this embodiment, a connecting cable is used to connect the connection port of the signal detection and generator host to the corresponding port of the cable fault tester. In the host computer software interface, the "low-voltage pulse method" is selected, and the target distance L = 1000m and propagation speed V = 200m / µs are set. The software automatically calculates the theoretical delay T = L / V = 5.0µs. The host computer software sends a control command containing the T value to the signal detection and generator host, and then activates the low-voltage pulse test function of the cable fault tester. The cable fault tester sends a low-voltage pulse signal to the signal detection and generator host. After receiving the low-voltage pulse signal, the signal detection and generator host generates a low-voltage pulse signal that matches the characteristics of the input low-voltage pulse signal after a 5.0µs delay and sends it back to the cable fault tester. The cable fault tester's internal high-speed sampling circuit synchronously acquires its own emitted pulses and received reflected pulses, displaying a waveform diagram containing these two pulses on the screen. The tester's processor analyzes the time difference between the leading edges of the two pulses on the waveform diagram to accurately measure the time interval Δt (ideally, the round-trip time 2T = 10.0µs). The instrument calls its internally preset propagation speed V' (usually 200m / µs) and calculates according to its inherent algorithm (the calculation formula is L' = V'Δt / 2), obtaining and displaying the distance measurement result L' (1000.2m). Comparing L' with L (1000m), the error is 0.2m, which is less than the allowable value in the specification (according to JJF(Mechanical) 1042-2020, for a 1000m point, the maximum allowable error is generally ±(0.5%×L+1m)=±6.0m), thus it is deemed qualified.

[0026] As an optional implementation, in the high-voltage flashover calibration mode, the signal interaction specifically includes: According to the control command, two high-voltage pulse signals are sent sequentially to the cable fault tester which is in a waiting trigger state, and the time interval between the two high-voltage pulse signals is equal to the theoretical delay time. In the high-voltage flashover calibration mode, the method by which the cable fault tester calculates the measured distance based on the signal interaction results includes: The cable fault tester calculates the measured distance by measuring the time interval between two received high-voltage pulse signals and combining this with the propagation speed set within the cable fault tester.

[0027] In the embodiments of this application, see Figure 3 Signal detection and generator main unit (i.e. Figure 3 The calibration source signal generator (the host in the instrument) sends two high-voltage pulse signals sequentially to the cable fault tester, which is in a waiting-to-trigger state, according to the control command.

[0028] In this embodiment, a connecting cable is used to connect the connection port of the signal detection and generator host to the corresponding port of the cable fault tester. In the host computer software, the "high-voltage flashover method" is selected, and L=3000m, V=200.0m / µs is set, resulting in T=3000m÷200.0m / µs=15.0µs. The cable fault tester is set to high-voltage flashover trigger mode. The signal detection and generator host actively generates two high-voltage pulse signals according to control commands. The first high-voltage pulse signal simulates a fault point breakdown, and after a 15.0µs interval, a second high-voltage pulse signal simulates a reflection. The cable fault tester captures these two pulses in high-voltage flashover trigger mode, displays their waveforms, and measures the time interval Δt=15.0µs between them. The cable fault tester calculates and displays the distance L'=200m / µs×15.0µs=3000.0m based on its internal algorithm, and calculates the absolute error ΔL=|L'-L|=0.0m. According to JJF(Mechanical)1042-2020, for the 3000.0m point, the maximum permissible error is ±(0.5%×3000+1m)=±16.0m. The error of 0.0m is less than the permissible value, so the calibration point is deemed qualified.

[0029] As an optional implementation, in the multi-pulse calibration mode, the signal interaction includes: According to the control command, two high-voltage pulse signals with a time interval equal to the theoretical delay time are sent to the cable fault tester; After receiving two high-voltage pulse signals, the cable fault tester sends a low-voltage pulse signal. After receiving the low-voltage pulse signal from the cable fault tester, and after the theoretical delay time, a low-voltage pulse signal is returned to the cable fault tester. In the multi-pulse calibration mode, the method by which the cable fault tester calculates the measured distance based on the signal interaction results includes: The cable fault tester processes the high-voltage pulse signal and the low-voltage pulse signal, and calculates the measured distance based on the propagation speed set inside the cable fault tester.

[0030] In the embodiments of this application, see Figure 4 Signal detection and generator main unit (i.e. Figure 4 The calibration source signal generator host sends two high-voltage pulse signals with a time interval equal to the theoretical delay time to the cable fault tester according to the control command; and the signal detection and generator host receives the low-voltage pulse signal sent by the cable fault tester.

[0031] In the embodiment of the present application, the connection port of the signal detection and generator host is connected to the corresponding port of the cable fault tester with a connecting wire. In the upper computer software, the "multiple pulse method" is selected, and L = 150 m and V = 200.0 m / µs are set. It is calculated that T = 150 m ÷ 200.0 m / µs = 0.75 µs. The signal detection and generator host first simulates the high-voltage flashover process and sends two high-voltage pulse signals (the first group of signals) with an interval of 0.75 µs to the cable fault tester, and the cable fault tester records this group of signals. Immediately afterwards, the cable fault tester automatically emits a low-voltage pulse signal. After the signal detection and generator host captures it, after a delay of 0.75 µs, a low-voltage pulse signal (the second group of signals) is returned to the cable fault tester. The cable fault tester calls its multiple pulse analysis program to process the two groups of waveforms, and finally calculates and displays the measured distance L' = 150.3 m, and the calculation error ΔL = |150.3 - 150| = 0.3 m. For the 150 m point, the maximum allowable error is ±(0.5% × 150 + 1) = ±1.75 m. The 0.3 m error is within the range, and it is determined to be qualified.

[0032] As an optional implementation manner, the calibration method of the cable fault tester further includes: By changing the target simulated fault distance and repeatedly executing the steps of step 101 to step 107, the calibration of the cable fault tester at the same or different test functions and at multiple distance points within the full range is completed.

[0033] In the embodiment of the present application, in order to comprehensively verify a cable fault tester with a nominal range of 20 m to 30 km and an accuracy of ±(0.5% × L + 1 m), the following typical distance points can be batch-set in the upper computer software for an automated calibration sequence: Short distance: 20 m, 50 m, 100 m; Medium distance: 500 m, 1000 m, 5000 m; Long distance: 10 km, 20 km, 30 km; For each distance point, execute the calibration process of the corresponding calibration mode, record the measured value L' and the error ΔL of each point, and finally generate a calibration report covering the full range to visually determine whether the instrument meets the requirements of the regulations.

[0034] The above values are illustrative examples. In actual calibration, the target distance L can be arbitrarily set within the range of 10 m to 100 km, and the propagation speed V can be selected within the common range (such as 160 - 200 m / µs) according to the cable type. The maximum allowable error formula is引自相关规范, and the specific limit values shall be subject to the latest valid standard.

[0035] It should be noted that the "calibration" mentioned in this invention refers to the operation of determining the indication error of the cable fault tester in a metrological sense. This involves comparing the tester's measurement results with the standard values ​​embodied in the calibration method to evaluate whether its ranging accuracy conforms to relevant technical specifications (such as JJF(Mechanical) 1042-2020). The solution provided by this invention is mainly used to complete the detection and evaluation process of this error, and does not involve the "correction" step of automatically adjusting the internal parameters of the cable fault tester after evaluation. The "correction" can be performed separately by the operator based on the calibration results.

[0036] Based on the same inventive concept, this application also provides a calibration system for a cable fault tester to implement the calibration method of the cable fault tester described above. The solution provided by this system is similar to the implementation described in the above method; therefore, the specific limitations of one or more embodiments of the cable fault tester calibration system provided below can be found in the limitations of the cable fault tester calibration system described above, and will not be repeated here.

[0037] In one exemplary embodiment, such as Figure 5 and Figure 6 As shown, a calibration system for a cable fault tester is provided, comprising: PC computer 201, the PC computer is used to set the target simulated fault distance and pulse signal propagation speed, generate control commands, and obtain the measured distance calculated by the cable fault tester based on the signal interaction results, and determine the distance measurement error of the cable fault tester under the corresponding test function based on the target simulated fault distance and the measured distance. Signal detection and generator main unit 202 (i.e. Figure 6 The signal detection and generator host is used to communicate with the PC computer and is configured to a calibration mode corresponding to a test function of the cable fault tester to be calibrated based on the control command. According to the configured calibration mode, it performs corresponding signal interaction with the cable fault tester to simulate the standard fault signal under the test function. A connection interface is located on the outside of the signal detection and generator host. The connection interface is used to connect to the cable fault tester to be calibrated for pulse signal transmission.

[0038] As an optional implementation, see [link to implementation details]. Figure 7 The signal detection and generator host 202 includes: Power module 2021, the power module is used to provide power to each module of the signal detection and generator host; Control and communication module 2022, the control and communication module is used to communicate with a PC computer and parse the control commands; Pulse signal detection module 2023, the pulse signal detection module is used to detect and capture the pulse signal emitted by the cable fault tester; Pulse signal generating module 2024, the pulse signal generating module is used to generate pulse signals; The control and communication module coordinates the working timing of the pulse signal detection module and the pulse signal generation module according to the parsed instructions.

[0039] As an optional implementation, the signal detection and generator host further includes: The programmable delay module 2025 is used to implement a precise delay after the pulse signal is detected by the pulse signal detection section, wherein the delay duration is determined by the control command. The mode switching module 2026 is used to switch between calibration modes corresponding to the low-voltage pulse method, the high-voltage flashover method, or the multiple pulse method according to the control command.

[0040] In the embodiments of this application, see Figure 8 This is a schematic diagram of the structure of a signal detection and generator host 202. Figure 8 In this system, the power supply module 2021 uses a 5V / 12V digital and control system to provide operating power for the MCU, FPGA, digital logic, etc.; the control and communication module 2022 uses the MCU for communication and status control, and the FPGA for data acquisition and storage, and is connected to the PC computer 101 via a communication cable (such as an RS232 serial cable); the AD conversion module converts the analog pulse signal from the signal port into a digital signal for FPGA processing, jointly realizing the signal acquisition and digitization function of the pulse signal detection module 2023; the waveform signal and trigger amplitude adjustment module receives configuration data from the control and communication module 2022. The parameters precisely control and adjust the internally generated signal waveform, amplitude, and trigger threshold to set accurate output parameters for the pulse signal generation module 2024. The programmable pulse signal output module, as the final generation terminal of the standard calibration signal, generates precise and controllable low-voltage pulses or high-voltage flashover pulses according to the instructions and waveform signals of the control and communication module 2022 and the parameters set by the trigger amplitude adjustment module, and outputs them through the signal port. The DC / DC boost converter provides the required high-voltage power supply for the circuit that generates high-voltage pulses in the programmable pulse signal output module. The programmable delay module 2025 implements the delay function using a high-precision counter / timer within the FPGA.

[0041] This implementation method integrates the calibration of multiple functions of the cable fault tester into a single device. It allows for flexible switching and execution of calibration tasks corresponding to various core testing functions of the cable fault tester (especially the low-voltage pulse method, high-voltage flashover method, and multiple pulse method) through a single hardware platform and unified control software. This solves the previous problem of requiring multiple devices and methods to complete the overall calibration, achieving "one machine, multiple calibrations" and greatly improving the integrity and convenience of the calibration work. In this application, although the signal excitation methods differ for different functions, the core calibration principle (i.e., simulating spatial distance L through precisely controlled time delay T) and error judgment logic are unified, thus ensuring the scientific rigor and precision of the calibration system.

[0042] In one exemplary embodiment, a computer device is provided, which may be a server or a terminal, and its internal structure diagram may be as follows. Figure 9 As shown, the computer device includes a processor, memory, input / output interfaces (I / O), and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The database stores calibration data for an electrical fault tester. The I / O interfaces are used for exchanging information between the processor and external devices. The communication interface is used for communication with external terminals via a network connection. When the computer program is executed by the processor, it implements a calibration method for an electrical fault tester.

[0043] Those skilled in the art will understand that Figure 9 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0044] In one exemplary embodiment, a computer device is also provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps in the above-described method embodiments.

[0045] In one exemplary embodiment, a computer-readable storage medium is provided storing a computer program that, when executed by a processor, implements the steps in the above-described method embodiments.

[0046] In one exemplary embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps in the above-described method embodiments.

[0047] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data must comply with relevant regulations.

[0048] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM).

[0049] The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0050] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A calibration method for a cable fault tester, characterized in that, The calibration method for the cable fault tester includes: Set target simulation fault distance and pulse signal propagation speed; The theoretical delay time is calculated based on the simulated fault distance of the target and the propagation speed of the pulse signal, and control commands are generated. The control command is configured to a calibration mode corresponding to a test function of the cable fault tester to be calibrated; wherein the calibration mode includes at least one of the following: low-voltage pulse method calibration mode, high-voltage flashover method calibration mode, and multiple pulse method calibration mode. Start the test function of the cable fault tester; According to the configured calibration mode, corresponding signal interaction is performed with the cable fault tester to simulate the standard fault signal under the test function; The measured distance is obtained by the cable fault tester based on the signal interaction results. Based on the target simulated fault distance and the measured distance, the distance measurement error of the cable fault tester under the corresponding test function is determined.

2. The calibration method for the cable fault tester according to claim 1, characterized in that, In the low-voltage pulse calibration mode, the signal interaction includes: The low-voltage pulse signal emitted by the cable fault tester under the test function is detected. After detecting the low-voltage pulse signal, and after the theoretical delay time, a low-voltage pulse signal is returned to the cable fault tester. In the low-voltage pulse calibration mode, the method by which the cable fault tester calculates the measured distance based on the signal interaction results includes: The cable fault tester calculates the measured distance by measuring the time interval between the low-voltage pulse signal it emits and the low-voltage pulse signal it receives, and by combining this with the propagation speed set within the cable fault tester.

3. The calibration method for the cable fault tester according to claim 1, characterized in that, In the high-voltage flashover calibration mode, the signal interaction specifically includes: According to the control command, two high-voltage pulse signals are sent sequentially to the cable fault tester which is in a waiting trigger state, and the time interval between the two high-voltage pulse signals is equal to the theoretical delay time. In the high-voltage flashover calibration mode, the method by which the cable fault tester calculates the measured distance based on the signal interaction results includes: The cable fault tester calculates the measured distance by measuring the time interval between two received high-voltage pulse signals and combining this with the propagation speed set within the cable fault tester.

4. The calibration method for the cable fault tester according to claim 1, characterized in that, In the multi-pulse calibration mode, the signal interaction includes: According to the control command, two high-voltage pulse signals with a time interval equal to the theoretical delay time are sent to the cable fault tester; After receiving two high-voltage pulse signals, the cable fault tester sends a low-voltage pulse signal. After receiving the low-voltage pulse signal from the cable fault tester, and after the theoretical delay time, a low-voltage pulse signal is returned to the cable fault tester. In the multi-pulse calibration mode, the method by which the cable fault tester calculates the measured distance based on the signal interaction results includes: The cable fault tester processes the high-voltage pulse signal and the low-voltage pulse signal, and calculates the measured distance based on the propagation speed set inside the cable fault tester.

5. The calibration method for the cable fault tester according to any one of claims 1 to 4, characterized in that, The calibration method for the cable fault tester also includes: By changing the target simulated fault distance and repeating the steps described in claim 1, the cable fault tester can be calibrated at multiple distance points under the same or different test functions and across the entire range.

6. A calibration system for a cable fault tester, characterized in that, The system includes: The PC computer is used to set the target simulated fault distance and pulse signal propagation speed, generate control commands, and obtain the measured distance calculated by the cable fault tester based on the signal interaction results. Based on the target simulated fault distance and the measured distance, the PC computer determines the distance measurement error of the cable fault tester under the corresponding test function. The signal detection and generator host is used to communicate with the PC computer, and is configured to a calibration mode corresponding to a test function of the cable fault tester to be calibrated based on the control command, and to perform corresponding signal interaction with the cable fault tester according to the configured calibration mode to simulate the standard fault signal under the test function. A connection interface is located on the outside of the signal detection and generator host. The connection interface is used to connect to the cable fault tester to be calibrated for pulse signal transmission.

7. The calibration system for the cable fault tester according to claim 6, characterized in that, The signal detection and generator host includes: A power supply module, which provides power to the various modules of the signal detection and generator host; A control and communication module, which is used to communicate with a PC computer and parse the control commands; A pulse signal detection module, which is used to detect and capture the pulse signal emitted by the cable fault tester; A pulse signal generating module, wherein the pulse signal generating module is used to generate pulse signals; The control and communication module coordinates the working timing of the pulse signal detection module and the pulse signal generation module according to the parsed instructions.

8. The calibration system for the cable fault tester according to claim 7, characterized in that, The signal detection and generator host also includes: A programmable delay module is provided, which is used to implement a precise delay after the pulse signal is detected by the pulse signal detection section, wherein the delay duration is determined by the control command. The mode switching module is used to switch between calibration modes corresponding to the low-voltage pulse method, the high-voltage flashover method, or the multiple pulse method according to the control command.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the calibration method for the cable fault tester according to any one of claims 1-5.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the calibration method for the cable fault tester according to any one of claims 1-5.

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