Breakdown voltage testing device and testing system

Abstract

The invention relates to the technical field of measuring equipment, and provides a breakdown voltage testing device and system, and the device comprises a visual cavity, a first electrode, a second electrode, an impulse voltage generator, and a voltage divider. Wherein the visual cavity is provided with a containing cavity, the containing cavity is used for containing ester insulating liquid, the first electrode is arranged in the visual cavity, the first electrode is provided with a first discharging end, the first discharging end is located in the containing cavity, the second electrode is arranged in the visual cavity, the second electrode is provided with a second discharging end, and the second discharging end is movably arranged in the containing cavity. The second discharge end and the first discharge end are opposite in the first direction and are arranged at an interval, the voltage divider is conductively connected with the impulse voltage generator, the voltage divider is provided with a high-voltage end and a low-voltage end, one of the high-voltage end and the low-voltage end is conductively connected with the first electrode, and the other one is conductively connected with the second electrode; the problem that a traditional organic ester breakdown voltage test is low in efficiency can be solved.

Description

Technical Field

[0001] This application relates to the field of measurement equipment technology, and in particular to a breakdown voltage testing device and testing system. Background Technology

[0002] Organic esters are insulating liquids synthesized from acids and alcohols through chemical reactions. Organic esters can be used as electrical insulating materials in electrical equipment such as transformers and switches, and can replace traditional mineral oil insulating liquids.

[0003] In related technologies, due to the complex internal electric field distribution of transformers, organic esters need to undergo breakdown voltage testing when used as insulating media in transformers.

[0004] However, traditional organic ester breakdown voltage testing methods suffer from low efficiency. Summary of the Invention

[0005] This application provides a breakdown voltage testing device and system, which can solve the problem of low efficiency in traditional organic ester breakdown voltage testing.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] This application provides a breakdown voltage testing device, comprising:

[0008] A visualization cavity, which has a receiving cavity for containing ester-based insulating liquid;

[0009] A first electrode is disposed in the visualization cavity, and the first electrode has a first discharge end located inside the receiving cavity;

[0010] The second electrode is disposed in the visualization cavity. The second electrode has a second discharge end, which is movably disposed in the receiving cavity. The second discharge end and the first discharge end face each other along the first direction and are spaced apart.

[0011] Impulse voltage generator; the impulse voltage generator is used for external power supply.

[0012] A voltage divider is conductively connected to an impulse voltage generator. The voltage divider is used to step down the voltage signal generated by the impulse voltage generator. The voltage divider has a high-voltage end and a low-voltage end. One of the high-voltage end and the low-voltage end is conductively connected to a first electrode, and the other is conductively connected to a second electrode.

[0013] In some implementations, it also includes:

[0014] The driving component has a mounting end and an output shaft. The mounting end is located in the visualization cavity, and the output shaft extends along a first direction and is connected to the second discharge end in a transmission manner. The driving component is used to drive the second discharge end to move along the first direction.

[0015] In some embodiments, the second electrode includes:

[0016] The first sub-electrode is disposed in the visualization cavity. The first sub-electrode is located inside the receiving cavity. The outer peripheral wall of the first sub-electrode and the first discharge end are spaced apart along the first direction. A through hole is provided on the outer peripheral wall of the first sub-electrode.

[0017] The second sub-electrode is movably sleeved inside the first sub-electrode and is connected to the output shaft via a drive. The end of the second sub-electrode away from the output shaft forms the second discharge terminal.

[0018] The second sub-electrode enters the receiving cavity through the through hole.

[0019] In some implementations, the visualization cavity has an opening that communicates with the receiving cavity;

[0020] The breakdown voltage testing device also includes:

[0021] The delivery assembly, which communicates with the receiving cavity through an opening, is used to deliver ester-based insulating liquid toward the receiving cavity.

[0022] In some embodiments, the delivery component includes:

[0023] Oil filter, used for storing ester-based insulating liquid, has an oil outlet;

[0024] The conveyor has one end connected to the opening and the other end connected to the oil outlet.

[0025] Pump, connected to the conveying component;

[0026] A switch element is located on the conveyor and is used to open or close the connection between the conveyor and the receiving cavity.

[0027] In some embodiments, two openings are provided, and the two openings are spaced apart along an intersecting first direction;

[0028] There are two conveyor components, and the two conveyor components and the two openings are connected in a one-to-one correspondence.

[0029] There are two oil outlets, which are spaced apart along the first direction where they intersect, and the two oil outlets are connected to the two conveying components one by one.

[0030] In some embodiments, the impulse voltage generator includes:

[0031] The first capacitor is used to connect the external power supply and the ground terminal respectively;

[0032] An isolation gap is electrically connected to the first capacitor;

[0033] The first resistor is conductively connected to the isolation gap, and the first resistor and the first capacitor are respectively located at both ends of the isolation gap;

[0034] The second resistor is electrically connected to the isolation gap and the first resistor.

[0035] In some implementations, the voltage divider includes:

[0036] The third capacitor is electrically connected to the second resistor and is also electrically connected to one of the first electrode and the second sub-electrode.

[0037] The fourth capacitor is conductively connected to the third capacitor and conductively connected to the first resistor. The fourth capacitor is sandwiched between the third capacitor and the first resistor. The fourth capacitor is conductively connected to the other of the first electrode and the second sub-electrode.

[0038] The breakdown voltage testing device also includes:

[0039] An oscilloscope is sandwiched between a third capacitor and a fourth capacitor, and is electrically connected to the third capacitor, the fourth capacitor, and the first resistor, respectively.

[0040] In some implementations, it also includes:

[0041] The camera lens is positioned so that its camera end faces the visualization cavity.

[0042] The control component, the conductive connection drive component, the imaging component, the oscilloscope, and the impulse voltage generator are at least one of the following:

[0043] Secondly, this application provides a testing system, including a breakdown voltage testing device.

[0044] This breakdown voltage testing device, with its visualized cavity, can accommodate the first electrode, the second electrode, and the ester-based insulating liquid, facilitating operator observation of the internal conditions. By incorporating the first electrode, the second electrode, an impulse voltage generator, and a voltage divider, the voltage signal generated by the impulse voltage generator can be stepped down and electrically connected to the first and second electrodes to simulate lightning impulse breakdown voltage. By movably placing the second discharge terminal within the cavity, the gap between the first and second discharge terminals can be adjusted, thereby regulating the electric field uniformity within the ester-based insulating liquid and improving the efficiency of electric field uniformity regulation.

[0045] Therefore, the breakdown voltage testing device provided in the embodiments of this application can solve the problem of low efficiency in traditional organic ester breakdown voltage testing. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a schematic diagram of the main structure of the breakdown voltage testing device provided in the embodiments of this application.

[0048] Explanation of reference numerals in the attached figures:

[0049] 100 - Visual cavity; 101 - Receiving cavity; 102 - Opening;

[0050] 200 - First electrode;

[0051] 300 - Second electrode; 301 - First sub-electrode; 302 - Second sub-electrode;

[0052] 400 - Impulse voltage generator; 401 - First capacitor; 402 - Isolation gap; 403 - First resistor; 404 - Second resistor;

[0053] 500 - Voltage divider; 501 - Third capacitor; 502 - Fourth capacitor; 503 - Oscilloscope;

[0054] 600-Driver;

[0055] 700 - Conveying assembly; 701 - Oil filter; 702 - Conveying parts; 703 - Pump; 704 - Switching parts;

[0056] 800-shot file;

[0057] 900 - Control components;

[0058] X - First direction. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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, 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. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0060] Traditional organic ester breakdown voltage tests use an impulse voltage generator, a voltage divider, and two electrodes. The voltage signal generated by the impulse voltage generator can be stepped down, and the high-voltage and low-voltage ends of the voltage divider are electrically connected to the two electrodes respectively.

[0061] When performing breakdown voltage tests on organic esters, the gap between the two electrodes needs to be adjusted to regulate the uniformity of the electric field.

[0062] In related technologies, the traditional method of adjusting the gap between two electrodes manually leads to low efficiency.

[0063] To overcome the shortcomings of existing technologies, a visualization cavity is designed to house the first electrode, the second electrode, and the ester-based insulating liquid. This allows operators to easily observe the conditions within the cavity. By incorporating the first electrode, the second electrode, an impulse voltage generator, and a voltage divider, the voltage signal generated by the impulse voltage generator can be stepped down and electrically connected to the first and second electrodes to simulate lightning impulse breakdown voltage. By movably placing the second discharge terminal within the cavity, the gap between the first and second discharge terminals can be adjusted, thereby regulating the electric field uniformity within the ester-based insulating liquid and improving the efficiency of electric field uniformity regulation.

[0064] Therefore, the breakdown voltage testing device provided in the embodiments of this application can solve the problem of low efficiency in traditional organic ester breakdown voltage testing.

[0065] The contents of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can have a clearer and more detailed understanding of the contents of this application.

[0066] like Figure 1As shown in the figure, this application provides a breakdown voltage testing device, including: a visualization cavity 100, a first electrode 200, a second electrode 300, an impulse voltage generator 400, and a voltage divider 500. The visualization cavity 100 includes a receiving cavity 101 for containing an ester-based insulating liquid. A first electrode 200 is disposed in the visualization cavity 100 and has a first discharge end located within the receiving cavity 101. A second electrode 300 is disposed in the visualization cavity 100 and has a second discharge end movably disposed within the receiving cavity 101. The second discharge end and the first discharge end face each other along a first direction and are spaced apart. An impulse voltage generator 400 is used to connect to an external power source. A voltage divider 500 is conductively connected to the impulse voltage generator 400 and is used to reduce the voltage signal generated by the impulse voltage generator 400. The voltage divider 500 has a high-voltage end and a low-voltage end. One of the high-voltage end and the low-voltage end is conductively connected to the first electrode 200, and the other is conductively connected to the second electrode 300.

[0067] The following sections provide a detailed description of the specific structure of the breakdown voltage testing device and system, as well as various possible implementation methods.

[0068] It should be noted that the visualization cavity 100 can be a glass cavity, an acrylic cavity, or an epoxy resin cavity; there are no restrictions, and it can be selected according to actual usage requirements.

[0069] It should be noted that the shape of the visualization cavity 100 can be a cylinder or a prism, and there are no restrictions here. It can be selected according to the actual use requirements.

[0070] Furthermore, when the shape of the visualization cavity 100 is a cylinder, the first direction can be the radial direction of the cylindrical visualization cavity 100 or the axial direction of the cylindrical visualization cavity 100. There is no limitation here, and it can be selected according to the actual use requirements.

[0071] Furthermore, when the shape of the visualization cavity 100 is a prism, the first direction can be the length direction of the prism visualization cavity 100, or the width direction of the prism visualization cavity 100, or the height direction of the prism visualization cavity 100. There are no restrictions here, and it can be selected according to the actual use requirements.

[0072] In one embodiment, the visualization cavity 100 is a cuboid structure, with the first direction being the height direction of the cuboid visualization cavity 100. Along the height direction of the cuboid visualization cavity 100, the first electrode 200 and the second electrode 300 are spaced apart. The first electrode 200 is located on the bottom wall of the cuboid visualization cavity 100, and the second electrode 300 is located on the top wall of the cuboid visualization cavity 100.

[0073] It is understandable that the above implementation method facilitates the observation of the breakdown voltage test results of ester-based insulating liquid, thereby facilitating the observation of the electric field between the first discharge terminal and the second discharge terminal.

[0074] It should be noted that during the breakdown voltage test of ester-based insulating liquid, both the first discharge terminal and the second discharge terminal are located inside the ester-based insulating liquid.

[0075] The breakdown voltage testing device provided in the embodiments of this application further includes: a driving member 600, which has a mounting end and an output shaft. The mounting end is disposed in the visualization cavity 100, and the output shaft extends along a first direction and is connected to the second discharge end in a transmission manner. The driving member 600 is used to drive the second discharge end to move along the first direction.

[0076] It is understandable that by setting the driving component 600, the second discharge end can be driven to move along the first direction, so that the gap between the second discharge end and the first discharge end can be changed, thereby adjusting the electric field uniformity between the first discharge end and the second discharge end.

[0077] It should be noted that the drive component 600 can be a cylinder, hydraulic cylinder, steam piston, or other reciprocating drive structure. There are no restrictions here, and it can be selected according to actual usage requirements.

[0078] The second electrode 300 provided in the embodiments of this application includes: a first sub-electrode 301 and a second sub-electrode 302. The first sub-electrode 301 is disposed in the visualization cavity 100 and located in the receiving cavity 101. The outer peripheral wall of the first sub-electrode 301 and the first discharge end are spaced apart along a first direction. A through hole is provided on the outer peripheral wall of the first sub-electrode 301. The second sub-electrode 302 is movably sleeved in the first sub-electrode 301 and is connected to the output shaft. The end of the second sub-electrode 302 away from the output shaft forms a second discharge end. The second sub-electrode 302 enters the receiving cavity 101 through the through hole.

[0079] It is understood that, through the above implementation method, when the second sub-electrode 302 does not protrude from the first sub-electrode 301, the second sub-electrode 302 and the first sub-electrode 301 are located on the same surface, and a uniform electric field is formed between the second discharge end and the first discharge end. It is also possible to form a non-uniform electric field between the second discharge end and the first discharge end when the second sub-electrode 302 protrudes from the first sub-electrode 301. In addition, it is also convenient to adjust the gap between the second discharge end and the first discharge end.

[0080] It should be noted that the first electrode 200 can be a first arc-shaped electrode and the first sub-electrode 301 can be a second arc-shaped electrode, or the first electrode 200 can be a first square electrode and the second sub-electrode 302 can be a second square electrode. The shape of the first electrode 200 and the first sub-electrode 301 is not limited and can be selected according to actual usage requirements.

[0081] In one embodiment, the first electrode 200 may be a first arc-shaped electrode, the first sub-electrode 301 may be a second arc-shaped electrode, and the second sub-electrode 302 may be a needle electrode. Along the first direction, the first arc-shaped electrode and the second arc-shaped electrode are spaced apart, and the needle electrode is movably disposed on the second arc-shaped electrode.

[0082] It is understood that, through the above implementation method, when the second sub-electrode 302 does not protrude from the first sub-electrode 301, the second sub-electrode 302 and the first sub-electrode 301 are located on the same surface, and a uniform electric field is formed between the second discharge end and the first discharge end. It is also possible to form a non-uniform electric field between the second discharge end and the first discharge end when the second sub-electrode 302 protrudes from the first sub-electrode 301. In addition, it is also convenient to adjust the gap between the second discharge end and the first discharge end.

[0083] It should be noted that the shape of the through hole can be circular, square, or irregular; there are no restrictions, and it can be selected according to actual usage requirements.

[0084] The visualization cavity 100 provided in the embodiments of this application has an opening 102, which is connected to a receiving cavity 101. The breakdown voltage testing device further includes a delivery component 700, which is connected to the receiving cavity 101 through the opening 102. The delivery component 700 is used to deliver ester-based insulating liquid toward the receiving cavity 101.

[0085] It is understood that, through the above embodiments, the ester-based insulating liquid can be transported through the delivery assembly 700 to the interior of the visualization cavity 100 for breakdown voltage testing. In some embodiments, the ester-based insulating liquid can also be transported through the delivery assembly 700 to the exterior of the visualization cavity 100 for replacement of the tested ester-based insulating liquid.

[0086] It should be noted that when the shape of the visualization cavity 100 is a cylinder, the opening 102 is located on the bottom wall of the cylinder; when the shape of the visualization cavity 100 is a prism, the opening 102 is located on the bottom wall of the prism.

[0087] It is understood that, through the above-described embodiments, the ester-based insulating liquid inside the visualization cavity 100 can flow out to the outside of the receiving cavity 101 under the action of gravity, thereby reducing the occurrence of ester-based insulating liquid residue inside the receiving cavity 101.

[0088] In one embodiment, the visualization cavity 100 is a cuboid structure, and the opening 102 is located on the bottom wall of the cuboid structure. When the first electrode 200 is located on the bottom wall of the cuboid visualization cavity 100, the opening 102 and the first electrode 200 are spaced apart.

[0089] It is understood that, through the above-described embodiments, the ester-based insulating liquid inside the visualization cavity 100 can flow out to the outside of the receiving cavity 101 under the action of gravity, thereby reducing the occurrence of ester-based insulating liquid residue inside the receiving cavity 101.

[0090] It should be noted that the conveying assembly 700 includes: an oil filter 701, a conveying component 702, a pump 703, and a switch 704. The oil filter 701 is used to store ester-based insulating liquid and has an oil outlet. One end of the conveying component 702 is connected to the opening 102, and the other end of the conveying component 702 is connected to the oil outlet. The pump 703 is connected to the conveying component 702, and the switch 704 is located on the conveying component 702. The switch 704 is used to open or close the connection between the conveying component 702 and the receiving cavity 101.

[0091] It is understood that, through the above embodiments, the ester-based insulating liquid in the oil filter 701 can be conveyed to the receiving cavity 101 via the conveying member 702, and the ester-based insulating liquid in the receiving cavity 101 can also be conveyed to the oil filter 701 via the conveying member 702. In this case, the pump 703 can facilitate the flow of the ester-based insulating liquid within the conveying member 702 and can also increase the conveying pressure of the ester-based insulating liquid to ensure that the ester-based insulating liquid can flow between the oil filter 701 and the receiving cavity 101. In some embodiments, the pump 703 can also increase the flow rate of the ester-based insulating liquid to shorten the time it takes for the ester-based insulating liquid to enter the receiving cavity 101 and to shorten the time it takes for the ester-based insulating liquid to flow out of the receiving cavity 101.

[0092] It should be noted that the conveying component 702 can be a conveying pipe or a connecting joint, and there are no restrictions on it. It can be selected according to the actual use requirements.

[0093] In one embodiment, two openings 102 are provided, and the two openings 102 are spaced apart along an intersecting first direction. Two conveying members 702 are provided, and the two conveying members 702 are connected to the two openings 102 in a one-to-one correspondence. Two oil outlets are provided, and the two oil outlets are spaced apart along an intersecting first direction. Two conveying members 702 are provided, and the two oil outlets are connected to the two conveying members 702 in a one-to-one correspondence.

[0094] It is understandable that increasing the number of openings 102 and conveying members 702 can increase the flow path of the ester insulating liquid between the conveying members 702 and the receiving cavity 101, thereby further shortening the time for the ester insulating liquid to enter the receiving cavity 101 and the time for it to flow out of the receiving cavity 101. Increasing the number of oil outlets can also increase the flow path of the ester insulating liquid between the conveying members 702 and the oil filter 701, thereby further shortening the time for the ester insulating liquid to enter the oil filter 701 and the time for it to flow out of the oil filter 701. In some embodiments, the ester insulating liquid in the oil filter 701 can be conveyed to the receiving cavity 101 via one of the two conveying members 702, and the ester insulating liquid in the receiving cavity 101 can be conveyed to the oil filter 701 via the other of the two conveying members 702.

[0095] It should be noted that the angle between the intersection with the first direction and the first direction can be any value between 0 degrees and 180 degrees, without any restriction, and can be selected according to actual usage requirements.

[0096] In one embodiment, the intersection is in a first direction, and the angle between the intersection and the first direction is 90 degrees.

[0097] It is understood that the above-described implementation method can reduce the mutual interference between the opening 102 and the first electrode 200.

[0098] The impulse voltage generator 400 provided in the embodiments of this application includes: a first capacitor 401, an isolation gap 402, a first resistor 403, and a second resistor 404. The first capacitor 401 is used to connect to an external power supply and a ground terminal respectively. The isolation gap 402 is conductively connected to the first capacitor 401. The first resistor 403 is conductively connected to the isolation gap 402. The first resistor 403 and the first capacitor 401 are respectively disposed at both ends of the isolation gap 402. The second resistor 404 is conductively connected to the isolation gap 402 and the first resistor 403 respectively.

[0099] Understandably, the impulse voltage generator 400 is a test device used to generate high-voltage pulses. It can generate lightning impulse waves. By setting the first capacitor 401, it can be used to store electrical energy and generate high-voltage pulses. By setting the isolation gap 402, it can trigger the discharge of the first capacitor 401. By setting the first resistor 403, it can adjust the tail time of the impulse wave, that is, the fall time of the impulse wave, and control the pulse duration. By setting the second resistor 404, it can adjust the front time of the impulse wave, that is, the rise time of the impulse wave, and control the discharge rate of the impulse voltage generator 400.

[0100] Furthermore, when the voltage of the first capacitor 401 reaches a preset value, the isolation gap 402 is broken down, forming a conductive path. The first capacitor 401 releases electrical energy to the voltage divider 500 through the first resistor 403 and the second resistor 404, generating an impulse voltage.

[0101] The voltage divider 500 provided in the embodiments of this application includes: a third capacitor 501 and a fourth capacitor 502. The third capacitor 501 is conductively connected to the second resistor 404 and is conductively connected to one of the first electrode 200 and the second sub-electrode 302. The fourth capacitor 502 is conductively connected to the third capacitor 501 and is conductively connected to the first resistor 403. The fourth capacitor 502 is sandwiched between the third capacitor 501 and the first resistor 403 and is conductively connected to the other of the first electrode 200 and the second sub-electrode 302. The breakdown voltage testing device further includes: an oscilloscope 503, which is sandwiched between the third capacitor 501 and the fourth capacitor 502 and is conductively connected to the third capacitor 501, the fourth capacitor 502 and the first resistor 403, respectively.

[0102] Understandably, by setting up the voltage divider 500, the lightning surge wave generated by the impulse voltage generator 400 can be stepped down to facilitate breakdown voltage measurement. By setting up the third capacitor 501, the instantaneous high voltage generated by the impulse voltage generator 400 can be applied to the voltage divider 500. By setting up the fourth capacitor 502, the high-voltage signal can be proportionally reduced, and a low-voltage signal can be output for measurement. By setting up the oscilloscope 503, the electrical signals generated by the impulse voltage generator 400 and the voltage divider 500 can be converted into intuitive waveform images to facilitate observation of the signal change process.

[0103] Furthermore, the third capacitor 501 can be electrically connected to the first electrode 200, and the fourth capacitor 502 can be electrically connected to the second sub-electrode 302, or the third capacitor 501 can be electrically connected to the second sub-electrode 302, and the fourth capacitor 502 can be electrically connected to the first electrode 200. There are no restrictions here, and the selection can be made according to the actual use requirements.

[0104] In one embodiment, the third capacitor 501 forms a high-voltage terminal and is connected to the second sub-electrode 302, and the fourth capacitor 502 forms a low-voltage terminal and is electrically connected to the first electrode 200.

[0105] It is understood that, through the above implementation method, the second sub-electrode 302 can be electrically connected to the high-voltage end, and the first electrode 200 can be electrically connected to the low-voltage end.

[0106] The breakdown voltage testing device provided in the embodiments of this application further includes: an imaging element 800 and a control element 900. The imaging end of the imaging element 800 is disposed facing the visualization cavity 100, and the control element 900 is electrically connected to at least one of the drive element 600, the imaging element 800, the oscilloscope 503, and the impulse voltage generator 400.

[0107] Understandably, by setting up the imaging element 800, images can be captured of the interior of the visualization cavity 100 to capture images of the initiation and propagation process of the ester insulating liquid within the visualization cavity 100. By setting up the control element 900, the spacing between the first electrode 200 and the second sub-electrode 302, the lightning impulse wave emitted by the impulse voltage generator 400, and the activation of the imaging element 800 and the oscilloscope 503 can be controlled, thereby realizing the breakdown voltage test of the ester insulating liquid.

[0108] Embodiments of this application provide a testing system, including the breakdown voltage testing device provided in any of the above embodiments.

[0109] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0110] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0111] It should be readily understood that the terms “on,” “above,” and “on top of” in this application should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0112] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90° or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A breakdown voltage testing device, characterized in that, include: A visualization cavity (100) having a receiving cavity (101) for containing an ester-based insulating liquid; A first electrode (200) is disposed in the visualization cavity (100), the first electrode (200) has a first discharge end, and the first discharge end is located in the receiving cavity (101); The second electrode (300) is disposed in the visualization cavity (100). The second electrode (300) has a second discharge end, which is movably disposed in the receiving cavity (101). The second discharge end and the first discharge end face each other along a first direction and are spaced apart. An impulse voltage generator (400) is used for external power supply; A voltage divider (500) is electrically connected to the impulse voltage generator (400). The voltage divider (500) is used to step down the voltage signal generated by the impulse voltage generator (400). The voltage divider (500) has a high voltage end and a low voltage end. One of the high voltage end and the low voltage end is electrically connected to the first electrode (200), and the other is electrically connected to the second electrode (300).

2. The breakdown voltage testing device according to claim 1, characterized in that, Also includes: A driving component (600) has a mounting end and an output shaft. The mounting end is disposed in the visualization cavity (100), and the output shaft extends along the first direction and is connected to the second discharge end in a transmission manner. The driving component (600) is used to drive the second discharge end to move along the first direction.

3. The breakdown voltage testing device according to claim 1, characterized in that, The second electrode (300) includes: The first sub-electrode (301) is disposed in the visualization cavity (100). The first sub-electrode (301) is located inside the receiving cavity (101). The outer peripheral wall of the first sub-electrode (301) and the first discharge end are spaced apart along the first direction. A through hole is provided on the outer peripheral wall of the first sub-electrode (301). The second sub-electrode (302) is movably sleeved inside the first sub-electrode (301) and is connected to the output shaft via a drive. The end of the second sub-electrode (302) away from the output shaft forms the second discharge terminal. The second sub-electrode (302) enters the receiving cavity (101) through the through hole.

4. The breakdown voltage testing device according to any one of claims 1-3, characterized in that, The visualization cavity (100) has an opening (102) that communicates with the receiving cavity (101); The breakdown voltage testing device also includes: A delivery assembly (700) is connected to the receiving cavity (101) through the opening (102), and the delivery assembly (700) is used to deliver the ester insulating liquid toward the receiving cavity (101).

5. The breakdown voltage testing device according to claim 4, characterized in that, The conveying assembly (700) includes: An oil filter (701) is provided for storing the ester-based insulating liquid and has an oil outlet. A conveying component (702), one end of which is connected to the opening (102), and the other end of which is connected to the oil outlet; Pump (703) is connected to the conveying component (702); A switch (704) is provided on the conveyor (702), and the switch (704) is used to open or close the communication between the conveyor (702) and the receiving cavity (101).

6. The breakdown voltage testing device according to claim 5, characterized in that, Two openings (102) are provided, and the two openings (102) are spaced apart along the intersecting first direction; There are two conveying components (702), and the two conveying components (702) and the two openings (102) are connected in a one-to-one correspondence; There are two oil outlets, which are spaced apart along the first direction. The two oil outlets and the two conveying components (702) are connected in a one-to-one correspondence.

7. The breakdown voltage testing apparatus according to any one of claims 1-3, characterized in that, The impulse voltage generator (400) includes: The first capacitor (401) is used to connect an external power supply and a ground terminal respectively; An isolation gap (402) is electrically connected to the first capacitor (401); A first resistor (403) is electrically connected to the isolation gap (402), and the first resistor (403) and the first capacitor (401) are respectively disposed at both ends of the isolation gap (402); The second resistor (404) is electrically connected to the isolation gap (402) and the first resistor (403), respectively.

8. The breakdown voltage testing device according to claim 7, characterized in that, The voltage divider (500) includes: The third capacitor (501) is electrically connected to the second resistor (404) and is also electrically connected to one of the first electrode (200) and the second sub-electrode (302). The fourth capacitor (502) is conductively connected to the third capacitor (501) and conductively connected to the first resistor (403). The fourth capacitor (502) is sandwiched between the third capacitor (501) and the first resistor (403). The fourth capacitor (502) is conductively connected to the other of the first electrode (200) and the second sub-electrode (302). The breakdown voltage testing device also includes: An oscilloscope (503) is sandwiched between the third capacitor (501) and the fourth capacitor (502), and is electrically connected to the third capacitor (501), the fourth capacitor (502) and the first resistor (403) respectively.

9. The breakdown voltage testing apparatus according to any one of claims 1-3, characterized in that, Also includes: A camera (800) is provided, with its camera end facing the visualization cavity (100); At least one of the control unit (900), the conductive connection drive unit (600), the imaging unit (800), the oscilloscope (503), and the impulse voltage generator (400).

10. A testing system, characterized in that, The breakdown voltage testing apparatus includes any one of claims 1-9.

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