Multi-channel voltage-withstanding insulation detection system

Abstract

The utility model relates to a multichannel voltage-withstanding insulation detection system, comprising a mobile cabinet and a high-voltage dielectric experiment cabinet which are connected together through a communication signal line and a high-voltage signal line, and a plurality of sets of detection tools which are connected in parallel are arranged in the high-voltage dielectric experiment cabinet. Each set of detection jig comprises a sample clamp and a programmable detection tool; the mobile cabinet is internally provided with a high voltage generation system used for providing high voltage signals for each set of detection tools and a voltage withstanding experiment control system used for applying high voltage to test ports of the detection tools, judging detection results according to current values of the test ports and issuing detection reports, wherein the high voltage generation system and the voltage withstanding experiment control system are in two-way communication connection. And the withstand voltage experiment control system is in bidirectional communication connection with each set of detection jig. The utility model can solve the problems of low detection efficiency and poor safety of the existing similar detection.

Description

Technical Field

[0001] The utility model relates to a withstand voltage insulation detection system, which is used for realizing the automatic detection of power frequency withstand voltage test of underground electrical parts used in coal mines. Background Art

[0002] The withstand voltage and insulation testing of electrical components used in underground coal mining machines generally focuses on the power frequency AC withstand voltage test. This test applies a high power frequency AC voltage that exceeds the rated voltage of the test sample by a certain multiple, replacing atmospheric and internal overvoltages. The test is applied to the insulation of the test sample for a specified period of time. This test is an effective method for verifying the test sample's ability to withstand various overvoltages. It fully reflects the actual conditions of the test sample when operating under power frequency AC voltage, and can effectively identify insulation defects in the test sample, thus ensuring the stable and reliable operation of the coal mining machine's electrical components in the complex and harsh underground conditions.

[0003] The withstand voltage insulation test of electrical components for underground coal mining machines currently mainly adopts the method of manual pressurization, manual switching of detection parts or mechanized detection using single-channel equipment. It can fully detect the insulation withstand voltage performance of relevant electrical components, and find products with poor insulation performance at an early stage, avoiding rework in the production process and avoiding replacement when serious faults occur during the use of coal mining machines. It greatly improves production efficiency and enhances the stable operation rate and safety of electrical components of coal mining machines. However, manual operation or single-channel mechanized detection is not efficient, and the personal safety of detection personnel is not guaranteed, which has a significant negative impact on the withstand voltage test of electrical components.

[0004] Upon investigation, it was found that there is currently no effective means for the domestic voltage-resistant insulation testing system for underground coal mining machines to realize automated detection and automatic reporting of multi-type product and multi-channel voltage-resistant tests. There is also no method to resolve the contradiction between the efficiency and safety of voltage-resistant tests and the demand for voltage-resistant tests on large quantities of various types of products. Utility Model Content

[0005] The utility model aims to provide a multi-channel withstand voltage insulation detection system to solve the problems of low efficiency and poor safety of existing similar detection systems.

[0006] The main technical solutions of this utility model are:

[0007] A multi-channel withstand voltage insulation testing system includes a mobile cabinet and a high-voltage dielectric test cabinet, which are connected together via communication signal lines and high-voltage signal lines. The high-voltage dielectric test cabinet is provided with multiple sets of parallel-connected testing fixtures, each set of testing fixtures includes a sample fixture and a programmable testing tooling for controlling the movement of the sample fixture, and each sample fixture has no fewer than three test ports. The mobile cabinet is provided with a high-voltage generating system with a bidirectional communication connection for providing a high-voltage signal to each set of testing fixtures, and a withstand voltage test control system for applying the high-voltage signal to a designated test port of a designated testing fixture, detecting the leakage current value of the test port, and judging whether the withstand voltage is qualified based on the leakage current value and issuing a test report. The withstand voltage test control system is bidirectionally connected to each set of testing fixtures.

[0008] The bottoms of the movable cabinet and the high-voltage dielectric experimental cabinet are both equipped with rollers.

[0009] There may be 8 sets of testing fixtures in the high-voltage dielectric test cabinet.

[0010] Each sample fixture reserves 8 test ports.

[0011] The high-voltage dielectric test cabinet as a whole or the cabinet body around the location of the detection fixture is preferably fully transparent.

[0012] The mobile cabinet is equipped with an industrial computer and a display connected to the industrial computer for two-way communication, a high-voltage meter for outputting high-voltage signals to each set of testing fixtures, a high-voltage scanning channel for providing high-voltage paths for each testing port of the testing fixture and responsible for switching between high-voltage paths, and an I / O controller for centrally controlling the actions of all testing fixtures. There are multiple high-voltage scanning channels and they correspond one-to-one to the testing fixtures. Each high-voltage scanning channel is connected to the high-voltage meter and the test port on the corresponding sample fixture through a high-voltage insulated cable. The I / O controller is connected to the communication module of each programmable testing tool through a communication cable. The industrial computer, display, high-voltage meter and high-voltage scanning channel constitute the high-voltage generation system, and the industrial computer, display and I / O controller constitute the withstand voltage test control system.

[0013] The display, industrial computer, I / O controller, high-voltage scanning channel and high-voltage instrument are arranged in layers from top to bottom and integrated into the cabinet of the mobile cabinet.

[0014] The high voltage instrument is a 20kV high voltage instrument.

[0015] All sample fixtures in the high-voltage dielectric test cabinet use no less than two fixture styles, and the mounting interface structures for connecting the sample fixtures of different fixture styles with the programmable detection fixtures are the same.

[0016] The beneficial effects of the utility model are:

[0017] The mobile cabinet used for control and the high-voltage dielectric experiment cabinet used for execution are placed separately, and the high-voltage generation system and the withstand voltage experiment control system are placed in the mobile cabinet, which ensures the integration, convenience and safety of the control system.

[0018] Connecting multiple sets of testing fixtures in parallel and placing them in a high-voltage dielectric test cabinet ensures efficient and safe execution.

[0019] The test efficiency is significantly improved due to the realization of automatic clamping and placing of test samples, automatic wiring, automatic detection, and automatic recording of test results. In addition, since the high-voltage dielectric test cabinet effectively isolates the internal power frequency withstand voltage test from external personnel, safety is also significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a block diagram of the composition of the multi-channel withstand voltage insulation detection system;

[0021] Figure 2 is a working principle diagram of the multi-channel withstand voltage insulation detection system;

[0022] Figure 3 It is an integrated layout diagram of the components of the multi-channel withstand voltage insulation detection system;

[0023] Figure 4 This is a front view of the test fixture and test sample used when testing a vacuum contactor.

[0024] Figure numerals: 1. Base plate; 2. Column; 21. Rib plate; 3. Slide; 4. Screw nut mechanism; 5. High-voltage insulation board; 6. Probe; 7. Stepper motor with brake; 8. Matching linear guide rail and slider. DETAILED DESCRIPTION

[0025] like Figure 1-4 As shown, the utility model discloses a multi-channel withstand voltage insulation testing system for automated testing of power frequency withstand voltage tests on electrical components used in underground coal mines. The system includes a mobile cabinet and a high-voltage dielectric test cabinet. The mobile cabinet and the high-voltage dielectric test cabinet are connected via communication signal lines and high-voltage signal lines.

[0026] The high-voltage dielectric test cabinet is equipped with multiple parallel-connected test fixtures. Each fixture includes a sample fixture for securing the test sample and a programmable test fixture for controlling the fixture's movement, such as speed and position. The programmable test fixture is a built-in programmable controller. Each sample fixture has no fewer than three test ports, each corresponding to a test point. The high-voltage dielectric test cabinet acts as an execution system.

[0027] The mobile cabinet houses a high-voltage generation system and a withstand voltage test control system with bidirectional communication. The high-voltage generation system provides high-voltage signals to each test fixture. The withstand voltage test control system, which has a bidirectional communication connection with each test fixture, comprehensively controls the withstand voltage test at each test fixture. This includes applying high-voltage signals to designated test ports on the sample fixture of a specific test fixture according to a set time and sequence, detecting leakage current at the test ports, and automatically determining withstand voltage compliance based on this leakage current value, generating a test report. The mobile cabinet functions as a high-voltage withstand voltage test control system.

[0028] The detection fixture receives the control signal from the mobile cabinet and controls the corresponding sample clamp according to the control instructions to clamp and release the test sample in time according to the settings, and automatically connect and disconnect the high-voltage signal line at the test port. At the same time, the leakage current signal under the action of high voltage is transmitted to the mobile cabinet and provided to the voltage withstand test control system for determining whether the voltage withstand is qualified.

[0029] Since the test samples are automatically clamped and placed, wiring is automatically performed, testing is automatically performed, and test results are automatically recorded, the test efficiency is significantly improved. In addition, since the high-voltage dielectric test cabinet effectively isolates the internal power frequency withstand voltage test from external personnel, the safety is also significantly improved.

[0030] The bottom of the mobile cabinet and the high-voltage dielectric test cabinet are both equipped with rollers, which facilitate the movement of the mobile cabinet and the high-voltage dielectric test cabinet and can quickly realize the power frequency withstand voltage test of electrical components in different places.

[0031] There are preferably 8 sets of testing fixtures in the high-voltage dielectric test cabinet.

[0032] Each sample fixture preferably has 8 test ports reserved, that is, each set of test fixtures can perform voltage withstand tests on up to 8 test points on the test sample, which can meet the voltage withstand insulation test needs of most electrical components used in coal mining machines.

[0033] The high-voltage dielectric test cabinet as a whole or the cabinet body around the detection fixture is fully transparent, which is convenient for viewing the internal operation status from the outside in real time. It can not only visually monitor the internal test status in real time, but also ensure the safety of external detection personnel.

[0034] The mobile cabinet is equipped with an industrial computer and a display connected to the industrial computer for two-way communication, a high-voltage instrument (i.e., a high-voltage test instrument), a high-voltage scanning channel (also known as a multi-channel expander), and an I / O controller. The industrial computer is the control center of the entire detection system, used to control the cooperation between other components in the mobile cabinet. At the same time, the industrial computer and the display are also used for human-computer interaction. The high-voltage instrument is used to output high-voltage signals to each set of detection fixtures and automatically determine whether the withstand voltage is qualified based on the leakage current under the action of high voltage, thereby obtaining the test results. The corresponding test results are then transmitted to the industrial computer, and the final qualified result is displayed on the display screen. The judgment standard is determined by the corresponding set value in the industrial computer.

[0035] The high-voltage scanning channel provides a high-voltage path for each test port on each test fixture and switches between them. There are multiple high-voltage scanning channels, each corresponding to a test fixture. Each high-voltage scanning channel is connected to the high-voltage instrument and the test port on the corresponding sample fixture via a high-voltage insulated cable. The high-voltage scanning channel controls which channel and test point has power and which does not. Therefore, it is used to control the test sequence of multiple channels and test points during each batch of withstand voltage testing. For example, suppose there are 4 sets of programmable testing fixtures with 4 test samples placed on them respectively, and each test sample has 8 points to be tested for withstand voltage. After the test sequence is set on the industrial computer, the test is started, and the high-voltage scanning channel executes the test sequence. One possible test sequence is to perform the tests in the order from the 1st to the 4th set of programmable testing fixtures. When each test sample is tested, test point A first performs a 10kV withstand voltage test on test point B for 1 minute, and then test point A performs a 10kV withstand voltage test on test point C for 1 minute, and then test point B performs a 10kV withstand voltage test on test point C for 1 minute, and so on, and all test points are tested one by one.

[0036] by Figure 2 Take the test of a pair of test samples with a detection fixture as an example. When point 1 needs to test the withstand voltage of points 2-8 respectively, first connect all points 1-8 with high-voltage insulated cables, and then use an industrial computer to set point 1 as the high-voltage point and points 2-8 as the low-voltage points. If only a part of the points are tested for withstand voltage, the other points do not need to be set.

[0037] The I / O controller is used to centrally control the movements of each test fixture, primarily controlling the sample fixture's up and down movements, movement speed, and start and stop conditions. The I / O controller's communication port is connected to the communication module of each programmable test fixture via a communication cable.

[0038] The industrial computer, display, high-voltage instrument and high-voltage scanning channel constitute the high-voltage generation system, and the industrial computer, display and I / O controller constitute the withstand voltage test control system.

[0039] The combined equipment including display, industrial computer, I / O controller, high voltage scanning channel and high voltage instrument are preferably made with uniform width, as consistent as possible depth and as compressed as possible height, and are arranged in layers from top to bottom and integrated into the cabinet of the mobile cabinet.

[0040] The testing fixtures of all testing fixtures are preferably made highly consistent to facilitate the integration of the testing fixtures in the high-voltage dielectric test cabinet.

[0041] The high voltage instrument in the embodiment shown in the drawings is a 20 kV high voltage instrument.

[0042] A three-color indicator light can also be set on the mobile cabinet. The green light indicates that the test is qualified, the red light indicates that the test is unqualified, and the yellow light indicates that the test is in progress. The input end of the three-color indicator light is connected to the warning light signal output end of the I / O controller.

[0043] There are many types of sample fixtures to suit the clamping of test samples of different electrical components. All sample fixtures in the high-voltage dielectric test cabinet should use no less than two types of fixtures, and the sample fixtures of different fixture styles should have the same installation interface structure for connection with the programmable detection fixture. This allows the purpose of testing different electrical components to be achieved by replacing sample fixtures of different fixture styles according to the different electrical components to which the test samples belong. For example, when the test sample changes, if there are no suitable sample fixtures on all the current test fixtures, an appropriate number of test fixtures can be selected to replace the appropriate sample fixtures. Replacing the sample fixture only requires removing and installing a certain number of screws.

[0044] Figure 4 The figure shows a test fixture for vacuum contactors. The fixture includes a base plate 1, a column 2, a slide 3, a lead screw and nut mechanism 4, a high-voltage insulation board 5, a probe 6, a stepper motor with a brake 7, and a matching linear guide and slider 8. The base plate and probes can serve as test ports. The column is vertically fixed to the base plate. The lead screw of the lead screw and nut mechanism is vertically mounted on the column and located in front of the column. The slide is fixed to the nut of the lead screw and nut mechanism. The upper end of the lead screw is coaxially connected to the stepper motor with a brake via a coupling. The linear guides are vertically mounted on the front side of the column, one on each side. The corresponding sliders on the two linear guides support and are fixed to the rear side of the slide. The rear portion of the high-voltage insulation board is detachably fixed to the slide, and the high-voltage insulation board is in a horizontally extending, cantilevered state. There are multiple probes, each extending vertically. The upper portion of each probe is fixedly mounted on the high-voltage insulation board. The lower end of each probe serves as a test port for electrically connecting to the input terminal or output terminal of the main circuit of the electrical component under test. The upper portion of each probe is connected to a high-voltage insulated cable. The high-voltage insulating board and the probes thereon constitute the sample fixture. During testing, the electrical component to be tested is placed on the bottom board.

[0045] The test fixture is placed on the workbench of the high-voltage dielectric test cabinet, with an insulating pad between the bottom plate and the workbench. In the initial state, the high-voltage insulating plate is stationary in an upper position. Before testing, the vacuum contactor to be tested is placed on the bottom plate. The stepper motor then operates to drive the high-voltage insulating plate with the probe down along the column until the lower part of the probe contacts the corresponding test point. Since the upper part of the probe is connected to the high-voltage insulating cable, it is equivalent to achieving automatic wiring of the corresponding test points on the vacuum contactor to be tested, and then automatic testing is started at the industrial computer. When all the planned test points on the vacuum contactor to be tested are tested, the stepper motor operates to drive the high-voltage insulating plate with the probe up along the column to return to the initial position. The vacuum contactor to be tested is automatically released, and the connection between the corresponding test point and the high-voltage insulating cable is also automatically disconnected.

[0046] When the sample fixture needs to be replaced, the high-voltage insulation board and the probe connected to the high-voltage insulation board are replaced and the probe is connected to the high-voltage insulation cable.

[0047] The high voltage dielectric test cabinet can also be operated locally. After switching to local control mode, the programmable test fixture (for Figure 4 The test fixture (specifically the stepper motor) initiates control of the sample fixture movement according to local instructions rather than instructions from the industrial computer. The operator starts the mobile cabinet for testing after confirming that the test sample is clamped and the test port is wired. After the test results are out, the high-voltage dielectric test cabinet is controlled to operate locally again, the test sample is released, and the test port wiring is disconnected. At this point, the sample power frequency withstand voltage test under the local control mode is completed.

[0048] The utility model not only solves the problem of low efficiency of high-voltage dielectric experiments, but also ensures the integration, convenience and safety of the high-voltage withstand voltage experiment control system and execution system.

Claims

1. A multi-channel withstand voltage insulation detection system, characterized by: It includes a mobile cabinet and a high-voltage dielectric test cabinet, which are connected together by communication signal lines and high-voltage signal lines. The high-voltage dielectric test cabinet is equipped with multiple sets of parallel-connected testing fixtures, each set of testing fixtures includes a sample fixture and a programmable testing tooling for controlling the movement of the sample fixture. Each sample fixture has no less than 3 test ports. The mobile cabinet is equipped with a high-voltage generating system with a two-way communication connection for providing a high-voltage signal to each set of testing fixtures, and a withstand voltage test control system for applying a high-voltage signal to a designated test port of a designated testing fixture, detecting the leakage current value of the test port, and judging whether the withstand voltage is qualified and issuing a test report based on the leakage current value. The withstand voltage test control system is connected to each set of testing fixtures in a two-way communication manner.

2. The multi-channel withstand voltage insulation detection system according to claim 1, characterized in that: The bottoms of the movable cabinet and the high-voltage dielectric experimental cabinet are both equipped with rollers.

3. The multi-channel withstand voltage insulation detection system according to claim 1, characterized in that: There are 8 sets of testing tools in the high voltage dielectric test cabinet.

4. The multi-channel withstand voltage insulation detection system according to claim 1, characterized in that: Each sample fixture reserves 8 test ports.

5. The multi-channel withstand voltage insulation detection system according to claim 1, characterized in that: The high-voltage dielectric test cabinet as a whole or the cabinet body around the location of the detection fixture is fully transparent.

6. The multi-channel withstand voltage insulation detection system according to claim 1, 2, 3, 4 or 5, characterized in that: The mobile cabinet is equipped with an industrial computer and a display connected to the industrial computer for two-way communication, a high-voltage meter for outputting high-voltage signals to each set of testing fixtures, a high-voltage scanning channel for providing high-voltage paths for each testing port of the testing fixture and responsible for switching between high-voltage paths, and an I / O controller for centrally controlling the actions of all testing fixtures. There are multiple high-voltage scanning channels and they correspond one-to-one to the testing fixtures. Each high-voltage scanning channel is connected to the high-voltage meter and the test port on the corresponding sample fixture through a high-voltage insulated cable. The I / O controller is connected to the communication module of each programmable testing tool through a communication cable. The industrial computer, display, high-voltage meter and high-voltage scanning channel constitute the high-voltage generation system, and the industrial computer, display and I / O controller constitute the withstand voltage test control system.

7. The multi-channel withstand voltage insulation detection system according to claim 6, characterized in that: The display, industrial computer, I / O controller, high-voltage scanning channel and high-voltage instrument are arranged in layers from top to bottom and integrated into the cabinet of the mobile cabinet.

8. The multi-channel withstand voltage insulation detection system according to claim 6, characterized in that: The high voltage instrument is a 20kV high voltage instrument.

9. The multi-channel withstand voltage insulation detection system according to claim 6, characterized in that: All sample fixtures in the high-voltage dielectric test cabinet use no less than two fixture styles, and the mounting interface structures for connecting the sample fixtures of different fixture styles with the programmable detection fixtures are the same.

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