Power-frequency alternating-current voltage-withstanding experimental device for electrical parts

Abstract

The utility model relates to an electrical part power frequency AC voltage withstand test device, which comprises a detection jig, the detection jig comprises a bottom plate, a vertical column, a sliding table, a lead screw nut mechanism, a high voltage insulation plate and a probe, the vertical column is vertically fixed on the bottom plate, the sliding table is vertically connected with the vertical column in a sliding manner, and the lead screw nut mechanism is fixed on the high voltage insulation plate. A lead screw of the lead screw nut mechanism is vertically installed on the stand column and located on the front side of the stand column, the sliding table is fixed to a nut of the lead screw nut mechanism, the upper end of the lead screw is coaxially connected with a stepping motor with a brake, the rear end of the high-voltage insulating plate is detachably and fixedly connected to the sliding table, and the high-voltage insulating plate is in a forward-extending cantilever state. The number of the probes is multiple, each probe vertically extends, the upper portion of each probe is fixedly installed on the high-voltage insulation plate, and the upper portion of each probe is connected with a high-voltage insulation cable. 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 mechanical tool used for power frequency AC withstand voltage insulation testing of electrical parts, which can improve the efficiency and safety of the withstand voltage insulation testing. Background Art

[0002] Various electrical components used in coal mining machines, such as vacuum contactors, disconnectors, power modules, and three-phase reactors, require power frequency withstand voltage testing. This test uses a power frequency AC high voltage that exceeds the rated voltage of the test sample by a certain multiple to replace atmospheric and internal overvoltages. This voltage is applied to the insulation of the test sample for a specified period of time. Withstand voltage testing is an effective method for verifying whether the insulation of the test sample can withstand various overvoltages. Traditional withstand voltage insulation testing involves manual application of pressure and switching of test points, which is not only inefficient but also poses a threat to the safety of test personnel. Utility Model Content

[0003] The utility model aims to provide an electrical component power frequency AC withstand voltage test device, which can reduce the labor intensity of test operation and improve test efficiency and safety.

[0004] The main technical solutions of this utility model are:

[0005] A power frequency AC withstand voltage test device for electrical components, including a detection fixture, which includes a base plate, a column, a slide, a screw and nut mechanism, a high-voltage insulating board and a probe. The column is vertically fixed to the base plate, the slide is vertically slidably connected to the column, the screw of the screw and nut mechanism is vertically installed on the column and is located on the front side of the column, the slide is fixed to the nut of the screw and nut mechanism, the upper end of the screw is coaxially connected to a stepper motor with a brake, the rear end of the high-voltage insulating board is detachably fixedly connected to the slide, and the high-voltage insulating board is in a forward cantilevered state. There are multiple probes, each of which extends vertically. The upper part of the probe is fixedly mounted on the high-voltage insulating board, and the upper part of each probe is connected to a high-voltage insulating cable.

[0006] The electrical component power frequency AC withstand voltage test device can also include matching linear guide rails and sliders, the linear guide rails are vertically installed on the column on the left and right, and the corresponding sliders on the two linear guide rails support and are fixed on the slide.

[0007] Two upper and lower travel switches are installed on a vertical edge of the column, and collision blocks are installed on the corresponding edges of the slide.

[0008] The column can be an inverted T-shaped structure, and two left and right ribs are provided at the rear lower part of the column.

[0009] The driver and controller of the stepper motor are both arranged between the left and right ribs at the rear lower part of the column.

[0010] The edge of the bottom plate may be provided with a plurality of handles.

[0011] The high-voltage insulation board preferably comprises two layers, an upper layer and an lower layer. The probes are dispersedly arranged on the two layers of high-voltage insulation board, and the upper and lower spacing between the two layers of high-voltage insulation board is adjustable.

[0012] The electrical component power frequency AC withstand voltage test device also includes a high-voltage dielectric test cabinet. The detection fixture is installed on a working platform inside the high-voltage dielectric test cabinet. An insulating pad is provided between the bottom plate of the detection fixture and the working platform. The high-voltage dielectric test cabinet body around the location of the detection fixture is completely transparent.

[0013] A plurality of the detection jigs are arranged on the work platform in an interval on the left and right sides, and a roller is installed on the bottom of the cabinet of the high-voltage dielectric experimental cabinet.

[0014] The beneficial effects of the utility model are:

[0015] After conducting a power-frequency AC withstand voltage test using the utility model's power-frequency AC withstand voltage test apparatus for electrical components, only untested components need to be manually placed on the pre-set test fixture and removed from the test fixture after testing. The test fixture replaces manual clamping, avoiding both human error and incorrect operation, as well as the dangers of manual clamping. Furthermore, the high-voltage dielectric test cabinet effectively isolates internal withstand voltage testing from external inspectors, enabling inspectors to monitor internal testing conditions in real time while ensuring the safety of external inspectors.

[0016] The high-voltage insulating plate and the probes mounted thereon can be replaced as a whole at any time as an assembly unit, thereby achieving the purpose of detecting different electrical components to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the main viewing direction structure of an embodiment of the detection fixture;

[0018] Figure 2 yes Figure 1 Side view of;

[0019] Figure 3 A schematic structural diagram of an embodiment of the power frequency AC withstand voltage test device for electrical components.

[0020] Description of the drawings: A. Testing fixture; 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; 9. Travel switch; 10. Handle; 12. Bumper; B. High-voltage dielectric test cabinet; C. Insulation pad. DETAILED DESCRIPTION

[0021] like Figure 1-3 As shown, the utility model discloses an electrical component power frequency AC withstand voltage test device, which can be used for the automated detection of power frequency AC withstand voltage tests of various electrical components (including vacuum contactors, disconnectors, power modules, three-phase reactors, etc.) used in underground coal mines, including a detection fixture A, and the detection fixture includes a base plate 1, a column 2, a slide 3, a screw nut mechanism 4, a high-voltage insulating plate 5 and a probe 6. The base plate and the probe act as test ports. The column is vertically fixed to the base plate, and the slide is vertically slidably connected to the column. The screw of the screw nut mechanism is vertically mounted on the column and is located on the front side of the column. The slide is fixed on the nut of the screw nut mechanism, and the upper end of the screw is coaxially connected to a stepper motor 7 with a brake through a coupling. The rear part of the high-voltage insulating plate is detachably fixedly connected to the slide, and the high-voltage insulating plate is in a cantilever state extending horizontally forward. There are multiple probes, each extending vertically. The upper part of the probe is fixedly mounted on a high-voltage insulating 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. In the embodiment shown in the accompanying drawings, there are 6 probes, which are used to connect to the three-phase AC input terminal and the three-phase AC output terminal of the electrical component under test. The upper part of each probe is connected to a high-voltage insulating cable, and the other end of the high-voltage insulating cable is connected to the high-voltage output terminal for outputting a high-voltage signal during the power frequency AC withstand voltage test. During testing, the electrical component under test is placed on the base plate.

[0022] The stepper motor, probes, and high-voltage output terminals are each connected to an industrial control computer. This computer centrally controls the other electrical components, including starting and stopping the stepper motor and its speed, detecting the current flowing through the probes (i.e., leakage current), and automatically recording test data, saving time when manually recording data. It also sets each test port to high or low voltage. If set to high voltage, the corresponding probe will output high voltage to the corresponding terminal of the electrical component under test.

[0023] After the experiment is started, the stepper motor drives the lead screw to rotate, driving the nut to drive the slide and then drive the probe to move down along the lead screw. When the probe moves down to the point where it reliably contacts the corresponding terminal of the electrical component under test, the stepper motor stops. Through the braking, the slide can be accurately stopped at any position within the travel range, thereby accurately controlling the up and down displacement of the probe. The braking can use an electro-permanent magnetic brake. When all test items on an electrical component under test are tested, the stepper motor starts again, driving the lead screw to rotate in the reverse direction, and then driving the probe to move up and disengage from the corresponding terminal of the electrical component under test, usually returning to the initial height. The stepper motor stops again, and the electrical component under test can be removed at this time.

[0024] The detection fixture can realize automatic clamping of the electrical components under test. Compared with the traditional manual clamping, the automatic clamping using the detection fixture can significantly improve the efficiency of the withstand voltage test, while also avoiding human errors and erroneous operations, avoiding dangers during manual clamping, saving time, and improving accuracy and safety.

[0025] The electrical component power frequency AC withstand voltage test device also preferably includes matching linear guides and sliders 8. One linear guide is vertically mounted on the front side of the column, while the corresponding sliders on the two linear guides support and are fixed to the rear side of the slide. Using these matching linear guides and sliders as guides for the slide's up and down movement provides high precision and excellent stability.

[0026] Two upper and lower limit switches 9 are also installed on a vertical edge of the column, which are used to locate the two end points of the probe stroke respectively. A collision block is installed on the corresponding edge of the slide. When the slide moves up and down and drives the collision block to touch the limit switch, the contact of the limit switch moves to send a signal to notify the industrial control computer that the starting point or end point of the stroke has been reached. The industrial control computer sends instructions to the stepper motor to control the stepper motor to start or stop. Adjusting the installation height of the limit switch is equivalent to adjusting the stroke of the probe, including the height position of the end points at both ends of the stroke and the stroke length. Usually, the stroke of the probe of different electrical components under test is also different. Therefore, when the category of the electrical component under test is to be changed, the height position of the two limit switches needs to be adjusted in advance.

[0027] The column can be an inverted T-shaped structure, with two ribs 21 located at the rear lower portion to provide greater structural stability. In the embodiment shown in the accompanying drawings, the column is welded from a horizontal plate and a vertical plate. The ribs are located at the left and right ends of the rear side of the vertical plate and are vertically connected between the horizontal and vertical plates. The screw and nut mechanism and the slide are both connected to the vertical plate.

[0028] The driver and controller of the stepper motor can be arranged between the left and right ribs at the rear lower part of the column, which makes full use of the space and makes the structure more compact.

[0029] The edge of the bottom plate may be provided with a plurality of handles 10 to facilitate the transportation of the detection fixture.

[0030] In order to adapt to the position of each electrical terminal on the electrical component under test and to facilitate the electrical contact between the lower end of each probe and the corresponding electrical terminal, the high-voltage insulating board preferably includes two layers of upper and lower boards, and the probes are dispersedly arranged on these two layers of high-voltage insulating boards, and the upper and lower spacing of the two layers of high-voltage insulating boards is adjustable. The front-to-back length of the upper high-voltage insulating board is greater than that of the lower high-voltage insulating board, and the probes corresponding to the front electrical terminals are installed near the front edge of the upper high-voltage insulating board. When a different electrical component under test needs to be replaced, it is only necessary to replace the corresponding high-voltage insulating board and the probes thereon. The installation position of the probes on the high-voltage insulating board is different for different electrical components under test, and the upper and lower spacing of the upper and lower high-voltage insulating boards may also be different.

[0031] The ideal placement of the electrical component under test can be marked on the baseplate. Simply place the component according to the pre-marked position and begin testing. The ideal placement of different components under test, or components of the same type but different models, often differs, and therefore requires separate marking.

[0032] like Figure 3 As shown, the electrical component power frequency AC withstand voltage test apparatus preferably also includes a high-voltage dielectric test cabinet B. The test fixture is mounted on a work platform within the high-voltage dielectric test cabinet, with an insulating pad C provided between the bottom plate of the test fixture and the work platform. The high-voltage dielectric test cabinet body surrounding the test fixture is preferably fully transparent to facilitate observation of the test process by inspectors. The high-voltage dielectric test cabinet effectively isolates internal withstand voltage testing from external inspectors, allowing inspectors to monitor internal testing conditions in real time while ensuring the safety of external inspectors.

[0033] Multiple test jigs can be arranged in a spaced-apart arrangement on the work platform, allowing for simultaneous measurement of multiple electrical components. During a single operation, multiple electrical components to be tested are placed one-to-one in each test jig according to their respective preset positions. A control program corresponding to the measurement items to be performed on each test jig is pre-set on an industrial computer. Upon pressing the start button on the industrial computer, the high-voltage insulation board of one test jig will move downward, carrying the probes thereon, and automatically contact the corresponding vacuum contactor. Once all measurements of the vacuum contactor are complete, the high-voltage insulation board will return upward, carrying the probes thereon, to their initial position, automatically disconnecting the probes from the corresponding vacuum contactor. This completes the measurement of all electrical components on that test jig. The next test jig then automatically begins the same process, and so on, until all electrical components on all test jigs have been measured. The high-voltage dielectric test cabinet is equipped with rollers at the bottom to facilitate its movement, enabling quick and easy power frequency withstand voltage testing of electrical components in different locations.

[0034] The terms front, rear, left and right herein are for the convenience of expressing the relative positional relationship between related structures, and do not constitute a limitation on the actual orientation of the electrical component power frequency AC withstand voltage test device.

Claims

1. A power frequency AC withstand voltage test device for electrical components, characterized by: The invention comprises a detection jig, which comprises a base plate, a column, a slide, a screw-nut mechanism, a high-voltage insulating board and a probe. The column is vertically fixed to the base plate, the slide is vertically slidably connected to the column, the screw of the screw-nut mechanism is vertically installed on the column and is located on the front side of the column, the slide is fixed to the nut of the screw-nut mechanism, the upper end of the screw is coaxially connected to a stepper motor with a brake, the rear end of the high-voltage insulating board is detachably fixedly connected to the slide, the high-voltage insulating board is in a forward cantilever state, there are multiple probes, each of the probes extends vertically, the upper part of the probe is fixedly installed on the high-voltage insulating board, and the upper part of each probe is connected to a high-voltage insulating cable.

2. The power frequency AC withstand voltage test device for electrical components according to claim 1, characterized in that: It also includes matching linear guide rails and sliders. The linear guide rails are vertically installed on the columns, one on the left and one on the right. The corresponding sliders on the two linear guide rails support and are fixed on the slide.

3. The power frequency AC withstand voltage test device for electrical components according to claim 2, characterized in that: Two upper and lower travel switches are installed on a vertical edge of the column, and collision blocks are installed on the corresponding edges of the slide.

4. The power frequency AC withstand voltage test device for electrical components according to claim 3, characterized in that: The column is an inverted T-shaped structure, and two left and right ribs are provided at the rear lower part of the column.

5. The power frequency AC withstand voltage test device for electrical components according to claim 4, characterized in that: The driver and controller of the stepper motor are both arranged between the left and right ribs at the rear lower part of the column.

6. The power frequency AC withstand voltage test device for electrical components according to claim 5, characterized in that: A plurality of handles are provided on the edge of the bottom plate.

7. The power frequency AC withstand voltage test device for electrical components according to claim 1, 2, 3, 4, 5 or 6, characterized in that: The high-voltage insulation board has two layers, the upper and lower layers. The probes are dispersedly arranged on the two layers of high-voltage insulation boards. The upper and lower spacing between the two layers of high-voltage insulation boards is adjustable.

8. The power frequency AC withstand voltage test device for electrical components according to claim 1, 2, 3, 4, 5 or 6, characterized in that: It also includes a high-voltage dielectric test cabinet, the detection fixture is installed on a work platform inside the high-voltage dielectric test cabinet, an insulating pad is provided between the bottom plate of the detection fixture and the work platform, and the high-voltage dielectric test cabinet body around the location of the detection fixture is fully transparent.

9. The power frequency AC withstand voltage test device for electrical components according to claim 7, characterized in that: It also includes a high-voltage dielectric test cabinet, the detection fixture is installed on a work platform inside the high-voltage dielectric test cabinet, an insulating pad is provided between the bottom plate of the detection fixture and the work platform, and the high-voltage dielectric test cabinet body around the location of the detection fixture is fully transparent.

10. The power frequency AC withstand voltage test device for electrical components according to claim 8, characterized in that: A plurality of the detection jigs are arranged on the work platform in an interval on the left and right sides, and a roller is installed on the bottom of the cabinet of the high-voltage dielectric experimental cabinet.

11. The power frequency AC withstand voltage test device for electrical components according to claim 9, characterized in that: A plurality of the detection jigs are arranged on the work platform in an interval on the left and right sides, and a roller is installed on the bottom of the cabinet of the high-voltage dielectric experimental cabinet.

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