On-resistance measuring device and method

Abstract

The invention discloses a conduction resistance measuring device and method, and relates to the technical field of grounding grid testing, and the device comprises a grounding conduction tester which is disposed at a reference device, and is used for obtaining the actual measurement conduction resistance between a to-be-tested device and the reference device, and the position coordinates of the reference device; and the mobile terminal is arranged at the to-be-tested equipment and is used for acquiring the position coordinates of the to-be-tested equipment and obtaining the corrected on-resistance between the reference equipment and the to-be-tested equipment according to the position coordinates of the reference equipment, the position coordinates of the to-be-tested equipment, the actually measured on-resistance and the wire parameters. According to the invention, the position coordinates of the reference device and the to-be-measured device are obtained, and the actually measured on-resistance is corrected according to the wire parameters, so that the accuracy of the on-resistance measurement result is improved.

Description

Technical Field

[0001] The present application relates to the technical field of grounding grid testing, and in particular to an on-resistance measuring device and method. Background Art

[0002] The ground continuity test is a fundamental test item in grounding grid safety assessments. Its purpose is to verify the electrical integrity of the grounding down conductors of electrical equipment in the grounding grid. The test requires selecting a ground down conductor from a device that is well connected to the main ground grid as a reference device. Then, the DC resistance between the two points is measured at selected measurement points. The ground continuity test can effectively reveal defects such as corrosion and breakage in the ground down conductor.

[0003] Substations and large hydropower stations with voltage levels of 220kV and above have large grounding grids. During ground continuity testing, the straight-line distance between the reference device and the device under test can range from 100m to 500m. Existing technologies for ground continuity testing in large grounding grids have the following shortcomings: ① The reference device is located far from the device under test, resulting in significant resistance in the test leads, affecting the accuracy of the test results; ② The large number of devices under test and test data makes manual recording time-consuming and labor-intensive, significantly impacting test efficiency; ③ During on-site testing, at least two personnel, including a tester and a safety monitor, are required at each of the reference and device under test, requiring at least four personnel to operate the equipment. Furthermore, the long distance between the reference device and the device under test in large grounding grids necessitates communication between testers using walkie-talkies, which is inefficient and impacts test efficiency; ④ The large amount of test data cannot be directly generated into electronic reports, making it difficult to identify abnormal data in real time, resulting in a low level of intelligence. Summary of the Invention

[0004] The purpose of this application is to provide a device and method for measuring on-resistance, which can improve the accuracy of on-resistance measurement results by obtaining the position coordinates of a reference device and a device to be measured and correcting the measured on-resistance according to the wire parameters.

[0005] To achieve the above objectives, this application provides the following solutions:

[0006] In a first aspect, the present application provides an on-resistance measuring device, comprising:

[0007] A ground continuity tester is provided at the reference device, and is used to obtain the measured continuity resistance between the device under test and the reference device and the position coordinates of the reference device;

[0008] The mobile terminal is arranged at the device under test, and is used to obtain the position coordinates of the device under test, and obtain the corrected on-resistance between the reference device and the device under test according to the position coordinates of the reference device, the position coordinates of the device under test, the measured on-resistance and the wire parameters.

[0009] In a second aspect, the present application provides a method for measuring on-resistance, comprising:

[0010] Use a ground continuity tester to obtain the measured continuity resistance between the device under test and the reference device and the location coordinates of the reference device;

[0011] The position coordinates of the device under test are acquired by a mobile terminal, and the corrected on-resistance between the reference device and the device under test is obtained according to the position coordinates of the reference device, the position coordinates of the device under test, the measured on-resistance and the wire parameters.

[0012] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0013] The present application provides an on-resistance measurement device and method, which improves the accuracy of the on-resistance measurement results by obtaining the position coordinates of a reference device and a device to be measured and correcting the measured on-resistance according to the wire parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. 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 creative work.

[0015] Figure 1 A schematic diagram of the functional modules of an on-resistance measurement device provided in one embodiment of the present application;

[0016] Figure 2 A schematic diagram of the overall structure of an on-resistance measurement device provided in one embodiment of the present application;

[0017] Figure 3 A working topology diagram of an on-resistance measurement device provided in one embodiment of the present application;

[0018] Figure 4 A schematic flow chart of an on-resistance measurement method provided in one embodiment of the present application.

[0019] Reference numerals:

[0020] 101 - ground continuity tester, 102 - mobile terminal, 201 - on-resistance measurement module, 202 - first positioning module, 203 - first communication module, 204 - first storage module, 205 - display screen, 206 - power supply module, 207 - second positioning module, 208 - second communication module, 209 - on-resistance correction module, 210 - voice recognition module, 211 - image recognition module, 212 - second storage module, 213 - report output module, 214 - central processing unit, 301 - reference device, 302 - wire, 303 - device under test. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0022] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0023] In an exemplary embodiment, Figure 1 As shown, a device for measuring on-resistance is provided, including a ground bond tester 101 and a mobile terminal 102. The ground bond tester 101 is disposed at a reference device and is used to obtain the measured on-resistance between a device under test and the reference device and the reference device's location coordinates. The mobile terminal 102 is disposed at the device under test and is used to obtain the device's location coordinates and, based on the reference device's location coordinates, the device under test's location coordinates, the measured on-resistance, and conductor parameters, obtain a corrected on-resistance between the reference device and the device under test.

[0024] In an exemplary embodiment, Figure 2 As shown, the ground continuity tester 101 includes a continuity resistance measurement module 201, a first positioning module 202, and a first communication module 203. The continuity resistance measurement module 201 is used to obtain the measured continuity resistance. The first positioning module 202 is used to obtain the location coordinates of the reference device. The first communication module 203 is used to send the measured continuity resistance and the reference device location coordinates to the mobile terminal 102.

[0025] In an exemplary embodiment, Figure 2As shown, the ground bond tester 101 further includes a first storage module 204, a display screen 205, and a power supply module 206. The first storage module 204 is used to store the measured bond resistance and the reference device location coordinates. The display screen 205 is used to display the operating parameters of the ground bond tester and the measured bond resistance. The power supply module 206 is used to supply power to other modules in the ground bond tester 101.

[0026] In an exemplary embodiment, Figure 2 As shown, the mobile terminal 102 includes a second positioning module 207, a second communication module 208 and an on-resistance correction module 209. Among them, the second positioning module 207 is used to obtain the position coordinates of the device under test. The second communication module 208 is used to receive the measured on-resistance and the reference device position coordinates. The on-resistance correction module 209 is used to obtain the corrected on-resistance based on the reference device position coordinates, the device under test position coordinates, the measured on-resistance and the wire parameters. In this embodiment, the on-resistance correction module 209 can display the measured on-resistance value, the reference device position coordinates, the device under test position coordinates, the wire cross-sectional area (mm 2 The mobile terminal 102 is further configured to issue a prompt message when the corrected on-resistance is greater than a preset threshold.

[0027] In an exemplary embodiment, Figure 2 As shown, the mobile terminal 102 also includes a voice recognition module 210. The voice recognition module 210 is configured to obtain control instructions based on voice data input by the user. The control instructions include a power-on instruction, a power-off instruction, a test start instruction, and a test current setting instruction. The ground continuity tester 101 is further configured to perform corresponding operations based on the control instructions.

[0028] In an exemplary embodiment, Figure 2 As shown, the mobile terminal 102 also includes an image recognition module 211, a second storage module 212, a report output module 213 and a central processing unit 214. Among them, the image recognition module 211 is used to use OCR (Optical Character Recognition) technology to identify the device nameplate and support manual modification. The second storage module 212 is used to store the corrected on-resistance and the position coordinates of the device under test. The report output module 213 is used to generate an on-resistance measurement report corresponding to the device under test based on the corrected on-resistance. The central processing unit 214 is used to issue control instructions to each module of the mobile terminal 102. In this embodiment, the report output module 213 exports the measurement data into a word format and marks the grounding conduction abnormality data.

[0029] In an exemplary embodiment, the ground continuity tester 101 and the mobile terminal 102 communicate using the Zigbee protocol.

[0030] In an exemplary embodiment, Figure 3 As shown, the ground continuity tester 101 is disposed at the reference device 301 and is electrically connected to the reference device 301. One end of the wire 302 is connected to the ground continuity tester 101, and the other end is connected to the grounding down conductor of the device under test 303. The mobile terminal 102 is disposed at the device under test 303.

[0031] In an exemplary embodiment, Figure 4 As shown, a method for measuring on-resistance is provided, including the following steps 401 and 402. In which:

[0032] Step 401: Use a ground continuity tester to obtain the measured continuity resistance between the device under test and the reference device and the position coordinates of the reference device.

[0033] Step 402: Use a mobile terminal to obtain the position coordinates of the device under test, and obtain the corrected on-resistance between the reference device and the device under test based on the position coordinates of the reference device, the position coordinates of the device under test, the measured on-resistance, and wire parameters.

[0034] In an exemplary embodiment, the above step 402 can be replaced by the following steps 4021 to 4023. In which:

[0035] Step 4021: Obtain the straight-line distance between the reference device and the device under test according to the position coordinates of the reference device and the position coordinates of the device under test.

[0036] Step 4022: Obtain the wire resistance according to the straight-line distance and the wire parameters.

[0037] Step 4023: Obtain the corrected on-resistance according to the measured on-resistance and the wire resistance.

[0038] In an exemplary embodiment, the flow of the on-resistance measurement method is as follows:

[0039] S1. Select a reference device. The main transformer itself is typically used as the reference device. The ground continuity tester 101 is placed securely next to the reference device and electrically connected to its grounding down conductor. The reference device remains stationary throughout the test. Turn on the ground continuity tester 101 and securely ground it. After the self-test completes, it automatically pairs with the mobile terminal 102. Upon successful pairing, the mobile terminal displays "Communication Normal," and the ground continuity tester 101 automatically records the reference device's location coordinates.

[0040] S2: Identify the device under test and connect the wire to the grounding lead of the device under test. Open the on-resistance measurement interface of mobile terminal 102 and click the "Device Under Test Location" function key. Locate the location of mobile terminal 102 to obtain the coordinates of the device under test. Click the "Reference Device Location" function key to obtain the coordinates of the reference device.

[0041] S3, the handheld mobile terminal 102 recognizes the device name of the device to be tested through the image recognition module 211. If the recognition is correct, the next step is performed. If it is incorrect, it is manually modified.

[0042] S4: Remotely control the ground continuity tester 101 via the voice recognition module 210, the first communication module 203, and the second communication module 208. If the recognized voice command is "Start test," the ground continuity tester 101 automatically selects a test current and begins testing. If the recognized voice command is "Test current is ~A, start test," the ground continuity tester 101 measures the actual conduction resistance according to the test current set by the voice command. The measurement result is transmitted to the mobile terminal 102 via the first communication module 203 and the second communication module 208 and stored in the second storage module 212.

[0043] S5, the mobile terminal 102 calculates the straight-line distance between the reference device and the device under test using the longitude and latitude based on the reference device location coordinates and the device under test location coordinates (it should be noted that in actual testing, the wires are not all straight lines, but for the convenience of calculation, the straight-line distance is used to correct the on-resistance. This method has minimized the impact of the wire resistance on the on-resistance measurement data). 2 )” and “Wire Resistivity (Ω·m)” modules, input corresponding parameters, and the mobile terminal 102 automatically calculates the wire resistance based on the straight-line distance between the reference device and the device under test and the cross-sectional area and resistivity of the wire, and stores it in the second storage module 212.

[0044] S6, the mobile terminal 102 obtains the corrected on-resistance based on the measured on-resistance and the wire resistance, and displays the measured on-resistance, the wire resistance and the corrected on-resistance through the on-resistance correction module 209. If the corrected on-resistance is below 50mΩ, the measurement result is automatically saved; if the corrected on-resistance is within the range of 50mΩ to 200mΩ, it is highlighted in blue font; if it is greater than 200mΩ, it is highlighted in red font. As long as the corrected on-resistance is greater than 50mΩ, a text prompt "Retest recommended" will be displayed. When retesting, the clamping position of the device to be tested can be appropriately polished. The test process remains unchanged, and the test results are manually saved.

[0045] S7, after measuring the on-resistance of a device under test, repeat the above process to measure the next device under test. After all devices under test are measured, the mobile terminal 102 can output an on-resistance measurement report as shown in Table 1.

[0046] Table 1 On-resistance measurement report

[0047]

[0048] The beneficial effects of this application are as follows:

[0049] 1. Taking into account the influence of wire resistance, the measured on-resistance is corrected to provide more accurate on-resistance measurement data.

[0050] 2. The number of on-site testers can be reduced by 2. Through voice recognition and other technologies, the power on / off control and test current setting of the equipment to be tested can be realized, which improves the level of intelligence.

[0051] 3. Can generate on-resistance measurement report, improving work efficiency.

[0052] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0053] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, database or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may 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 may include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0054] The databases involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The processors involved in the various embodiments provided herein may include, but are not limited to, general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic units, data processing logic units based on quantum computing, and the like.

[0055] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the method and core concept of this application. At the same time, for those skilled in the art, based on the concept of this application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A device for measuring on-resistance, characterized in that: The on-resistance measuring device comprises: A ground continuity tester is provided at the reference device, and is used to obtain the measured continuity resistance between the device under test and the reference device and the position coordinates of the reference device; The mobile terminal is arranged at the device under test, and is used to obtain the position coordinates of the device under test, and obtain the corrected on-resistance between the reference device and the device under test according to the position coordinates of the reference device, the position coordinates of the device under test, the measured on-resistance and the wire parameters.

2. The on-resistance measuring device according to claim 1, wherein: The mobile terminal is further configured to issue a prompt message when the corrected on-resistance is greater than a preset threshold.

3. The on-resistance measuring device according to claim 1, wherein: The ground continuity tester comprises: An on-resistance measurement module, configured to obtain the measured on-resistance; A first positioning module, configured to obtain the position coordinates of the reference device; The first communication module is used to send the measured on-resistance and the reference device position coordinates to the mobile terminal.

4. The on-resistance measuring device according to claim 3, wherein: The ground continuity tester further comprises: A first storage module, configured to store the measured on-resistance and the reference device position coordinates; A display screen is used to display the operating parameters of the ground continuity tester and the measured continuity resistance.

5. The on-resistance measuring device according to claim 1, wherein: The mobile terminal includes: A second positioning module is used to obtain the position coordinates of the device under test; A second communication module is used to receive the measured on-resistance and the position coordinates of the reference device; The on-resistance correction module is used to obtain the corrected on-resistance according to the reference device position coordinates, the device under test position coordinates, the measured on-resistance and wire parameters.

6. The on-resistance measuring device according to claim 5, characterized in that: The mobile terminal further includes a voice recognition module, which is used to obtain control instructions based on voice data input by the user; the control instructions include a power-on instruction, a power-off instruction, a start test instruction, and a test current setting instruction; The ground continuity tester is further configured to execute corresponding operations according to the control instruction.

7. The on-resistance measuring device according to claim 5, characterized in that: The mobile terminal further includes a report output module, and the report output module is configured to generate an on-resistance measurement report according to the corrected on-resistance.

8. The on-resistance measuring device according to claim 1, wherein: The ground continuity tester and the mobile terminal communicate using the Zigbee protocol.

9. A method for measuring on-resistance, applied to the on-resistance measuring device according to any one of claims 1 to 8, characterized in that: The on-resistance measurement method comprises: Use a ground continuity tester to obtain the measured continuity resistance between the device under test and the reference device and the location coordinates of the reference device; The position coordinates of the device under test are acquired by a mobile terminal, and the corrected on-resistance between the reference device and the device under test is obtained according to the position coordinates of the reference device, the position coordinates of the device under test, the measured on-resistance and the wire parameters.

10. The on-resistance measurement method according to claim 9, characterized in that: Obtaining a corrected on-resistance between the reference device and the device under test according to the reference device position coordinates, the device under test position coordinates, the measured on-resistance, and wire parameters, specifically comprising: Obtaining a straight-line distance between the reference device and the device under test according to the position coordinates of the reference device and the position coordinates of the device under test; Obtaining the wire resistance according to the straight-line distance and the wire parameters; The corrected on-resistance is obtained according to the measured on-resistance and the wire resistance.

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