A breakdown voltage test fixture and a breakdown voltage test device

Abstract

The present invention relates to a breakdown voltage test fixture and a breakdown voltage test device, wherein the breakdown voltage test fixture is used for a sheet-shaped insulating material containing a rubber phase, and includes: a first electrode, a second electrode, a first template, and a second template; a clamping cavity for clamping the sheet-shaped insulating material is formed between the first template and the second template; a first through hole communicating with the clamping cavity is formed on the first template; a second through hole communicating with the clamping cavity is formed on the second template; the first electrode abuts against the first through hole; the second electrode abuts against the second through hole. By avoiding direct contact between the electrodes and the sheet-shaped insulating material, the embodiment of the present invention solves the problems that in the existing breakdown field strength test technology, the stress damage of the electrodes to the specimen causes deviation in the breakdown voltage test result of the specimen, and the problem that the occurrence of surface flashover of the specimen during the measurement process causes errors in the test result.

Description

Technical Field

[0001] The present invention relates to a breakdown voltage test fixture and a breakdown voltage test device. Background Art

[0002] The existing measurement of the breakdown voltage of sheet-shaped insulating materials mainly uses methods such as ball-ball electrodes, ball-plate electrodes, needle-needle electrodes, and needle-plate electrodes. Among them, the sheet-shaped insulating material is fixed by the external pressure between the two electrodes. This fixing method is mainly applicable to sheet-shaped insulating materials without a rubber phase and with a higher hardness. The breakdown voltage of this kind of sheet-shaped insulating material is not very sensitive to the external stress, and a small external stress has little influence on the breakdown voltage test result.

[0003] For sheet-shaped insulating materials containing rubber, because they are relatively soft, they are not very suitable for the existing breakdown voltage system. Since the test thickness of the sheet-shaped insulating material containing a rubber phase is mainly 100μm - 200μm, the external stress will change the thickness of the test material during the electrode fixing process. And the breakdown field strength is calculated as the breakdown voltage divided by the thickness, so it will affect the measured value of the material breakdown field strength. The external stress condition of the electrode will also cause a phase change between the original rubber phase and the continuous phase, resulting in partial stress damage, making the breakdown voltage test result have a large error. In addition, relying only on the point stress generated by the electrode to fix the specimen is unreliable, and it is very easy for the specimen to flutter under the action of the electric field and cause surface flashover, resulting in deviation of the test result. Summary of the Invention

[0004] The object of the present invention is to provide a breakdown voltage test fixture and a breakdown voltage test device that can avoid direct contact between the electrode and the sheet-shaped insulating material, and solve the problem that the stress damage of the electrode stress to the specimen in the existing breakdown field strength test technology causes deviation of the specimen breakdown voltage test result.

[0005] To achieve the above object, the present invention provides a breakdown voltage test fixture for sheet-shaped insulating materials containing a rubber phase, including: a first electrode, a second electrode, a first template, and a second template; a clamping cavity for clamping the sheet-shaped insulating material is formed between the first template and the second template; a first through hole communicating with the clamping cavity is opened on the first template; a second through hole communicating with the clamping cavity is opened on the second template; the first electrode abuts against the first through hole; the second electrode abuts against the second through hole.

[0006] Optionally, the first template and the second template are arranged in parallel; the thickness of the clamping cavity is the same as the thickness of the sheet-shaped insulating material.

[0007] Optionally, the first electrode and the second electrode are respectively spherical electrodes.

[0008] Optionally, the first through hole includes: a first circular hole section and a second circular hole section; opposite ends of the second circular hole section are respectively in communication with the first circular hole section and the clamping cavity; the diameter of the second circular hole section is smaller than the diameter of the first electrode; the first electrode abuts against the edge of the second circular hole section.

[0009] Optionally, the second through hole includes: a third circular hole section and a fourth circular hole section; opposite ends of the fourth circular hole section are respectively in communication with the third circular hole section and the clamping cavity; the diameter of the fourth circular hole section is smaller than the diameter of the second electrode; the second electrode abuts against the edge of the fourth circular hole section.

[0010] Optionally, it further includes: a first chuck and a first needle tip; the first chuck is respectively connected to the first needle tip and the first electrode; the first needle tip is electrically connected to the first electrode.

[0011] Optionally, the first through hole includes: a fifth circular hole section and a sixth circular hole section; opposite ends of the sixth circular hole section are respectively in communication with the fifth circular hole section and the clamping cavity; the diameter of the sixth circular hole section is smaller than the diameter of the first chuck; the first chuck abuts against the bottom surface of the fifth circular hole section.

[0012] Optionally, it further includes: a second chuck and a second needle tip; the second chuck is respectively connected to the second needle tip and the second electrode; the second needle tip is electrically connected to the second electrode. [[ID=!3]]

[0013] Optionally, the second through hole includes: a seventh circular hole section and an eighth circular hole section; opposite ends of the eighth circular hole section are respectively in communication with the seventh circular hole section and the clamping cavity; the diameter of the eighth circular hole section is smaller than the diameter of the second chuck; the second chuck abuts against the bottom surface of the seventh circular hole section.

[0014] A breakdown voltage test device includes: a high-voltage transformer, a wiring terminal for connection to ground, and the breakdown voltage test fixture as described in any one of the above; the high-voltage transformer is connected to the first electrode; the wiring terminal is in communication with the second electrode.

[0015] Compared with the prior art, the breakdown voltage test fixture and the breakdown voltage test device according to the embodiments of the present invention have the following beneficial effects:

[0016] By avoiding direct contact between the electrodes and the sheet-shaped insulating material, the embodiments of the present invention solve the problems in the existing breakdown field strength test technology that stress damage to the specimen caused by electrode stress leads to deviation in the breakdown voltage test result of the specimen, and the problem that flashover along the surface of the specimen during the measurement process causes errors in the test result. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the first electrode and the second electrode in an embodiment of the present invention;

[0018] Figure 2 It is a schematic structural diagram of the first electrode in an embodiment of the present invention;

[0019] Figure 3 It is a schematic structural diagram of the second electrode in an embodiment of the present invention;

[0020] Figure 4 It is a schematic structural diagram of the first electrode in another embodiment of the present invention;

[0021] Figure 5 It is a schematic structural diagram of the second electrode in another embodiment of the present invention.

[0022] In the figure, 1 is the first electrode; 2 is the second electrode; 3 is the first template; 31 is the first through hole; 311 is the first circular hole section; 312 is the second circular hole section; 313 is the fifth circular hole section; 314 is the sixth circular hole section; 4 is the second template; 41 is the second through hole; 411 is the third circular hole section; 412 is the fourth circular hole section; 413 is the seventh circular hole section; 414 is the eighth circular hole section; 6 is the sheet insulating material; 7 is the first chuck; 8 is the first needle tip; 9 is the second chuck; 10 is the second needle tip; 11 is the high-voltage transformer; 12 is the terminal. Detailed implementation manners

[0023] The following will further describe in detail the specific implementation manners of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0024] First of all, it should be noted that the top, bottom, upward, downward and other orientations mentioned in this article are defined relative to the directions in each drawing. They are relative concepts and can therefore change according to their different positions and different practical states. Therefore, these or other orientations should not be used as restrictive terms.

[0025] It should be noted that the term "including" does not exclude other elements or steps, and "a" or "one" does not exclude a plurality.

[0026] In addition, it should also be pointed out that for any single technical feature described or implied in the embodiments of this article, or any single technical feature shown or implied in the drawings, combinations can still be continued between these technical features (or their equivalents) to obtain other embodiments of the present application that are not directly mentioned in this article.

[0027] It should also be understood that the terms "first", "second", etc. are used herein to describe various information, but such information should not be limited to these terms, which are only used to distinguish information of the same type from each other. For example, without departing from the scope of the present application, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0028] It should be noted that in different drawings, the same reference numerals denote the same or substantially the same components.

[0029] An embodiment of the present invention preferably provides a breakdown voltage testing device, which includes: a high-voltage transformer 11, a terminal 12 for connecting to the ground, and a breakdown voltage testing fixture. The high-voltage transformer 11 is connected to the first electrode 1. The terminal 12 communicates with the second electrode 2.

[0030] As Figure 1 , Figure 2 and Figure 3 shown, an embodiment of the present invention preferably provides a breakdown voltage testing fixture for a sheet-shaped insulating material 6 containing a rubber phase, which includes: a first electrode 1, a second electrode 2, a first template 3, and a second template 4. A clamping cavity for clamping the sheet-shaped insulating material 6 is formed between the first template 3 and the second template 4. A first through hole 31 communicating with the clamping cavity is formed on the first template 3. A second through hole 41 communicating with the clamping cavity is formed on the second template 4. The first electrode 1 abuts against the first through hole 31. The second electrode 2 abuts against the second through hole 41.

[0031] Based on the above structure, in the present application, first, the sheet-shaped insulating material 6 is placed between the first template 3 and the second template 4, and the sheet-shaped insulating material 6 can be fixed between the first template 3 and the second template 4 by curing or buckling; then, the first electrode 1 is connected through the high-voltage transformer 11, the terminal 12 is connected to the second electrode 2, the first electrode 1 is placed in the first through hole 31, and the second electrode 2 is placed in the second through hole 41 to form a breakdown loop; finally, the high-voltage transformer 11 outputs a voltage, and the output voltage parameters are continuously adjusted until the sheet-shaped insulating material 6 breaks down, and the output electric field parameters at the time of breakdown are recorded. By using the breakdown voltage testing fixture of the present application, by avoiding direct contact between the electrodes and the sheet-shaped insulating material 6, the problems that the stress damage of the electrodes to the specimen in the existing breakdown field strength testing technology causes deviation in the breakdown voltage test result of the specimen, and the problem that the surface flashover of the specimen during the measurement process causes errors in the test result are solved.

[0032] Specifically, the first template 3 and the second template 4 are selected as materials with a breakdown field strength at least 50% higher than that of the sample to be tested and having a certain stiffness, such as high breakdown field strength materials like polyimide (PI), polymethyl methacrylate (PMMA), etc., to effectively prevent the sample from displacing and creeping along the surface during the breakdown test.

[0033] It can be understood that, referring to Figure 1 , the present application can detect multiple positions of the sheet-shaped insulating material 6 by providing multiple first through-holes 31 and second through-holes 41, so as to further reduce errors.

[0034] Furthermore, referring to Figure 1 , the first template 3 and the second template 4 are arranged in parallel; the thickness of the clamping cavity is the same as the thickness of the sheet-shaped insulating material 6, thereby achieving the fixation of the sheet-shaped insulating material 6.

[0035] In an embodiment of the first electrode 1 and the second electrode 2, referring to Figure 1 、 Figure 2 and Figure 3 , the first electrode 1 and the second electrode 2 are spherical electrodes respectively.

[0036] In a possible embodiment, referring to Figure 2 , the first through-hole 31 includes: a first circular hole section 311 and a second circular hole section 312. The two opposite ends of the second circular hole section 312 are respectively in communication with the first circular hole section 311 and the clamping cavity. The diameter of the second circular hole section 312 is smaller than the diameter of the first electrode 1, so that the spherical first electrode 1 cannot pass through the second circular hole section 312, and the first electrode 1 abuts against the edge of the second circular hole section 312, thereby achieving a clamping effect on the spherical first electrode 1, so that the spherical first electrode 1 does not generate additional stress on the sheet-shaped insulating material 6. Additionally, the depth of penetration of the spherical first electrode 1 into the second circular hole section 312 can be changed by changing the diameter of the second circular hole section 312, so that the first electrode 1 can slightly contact or not contact the sheet-shaped insulating material 6. Among them, the first electrode 1 needs to pass through the first circular hole section 311 and then enter the second circular hole section 312, that is, it needs to pass through a larger circular hole section and then enter a smaller circular hole section, which can achieve more accurate electrode positioning and a guiding effect on the first electrode 1.

[0037] In a possible embodiment, referring to Figure 3, the second through hole 41 includes: a third circular hole section 411 and a fourth circular hole section 412. Opposite ends of the fourth circular hole section 412 are respectively in communication with the third circular hole section 411 and the clamping cavity. The diameter of the fourth circular hole section 412 is smaller than the diameter of the second electrode 2, so that the spherical second electrode 2 cannot pass through the fourth circular hole section 412. The second electrode 2 abuts against the edge of the fourth circular hole section 412, thus achieving a clamping effect on the spherical second electrode 2, preventing the spherical second electrode 2 from exerting additional stress on the sheet-shaped insulating material 6. Additionally, by changing the diameter of the fourth circular hole section 412, the depth of penetration of the spherical second electrode 2 into the fourth circular hole section 412 can be changed, enabling the second electrode 2 to be in slight contact with the sheet-shaped insulating material 6 or not in contact. Among them, the second electrode 2 needs to pass through the third circular hole section 411 and then enter the fourth circular hole section 412, that is, it needs to pass through a larger circular hole section and then enter a smaller circular hole section, which can achieve more accurate electrode positioning and a guiding effect on the second electrode 2.

[0038] In another embodiment of the first electrode 1 and the second electrode 2, refer to Figure 4 , the embodiment of the present invention further includes: a first chuck 7 and a first tip 8. The first chuck 7 is respectively connected to the first tip 8 and the first electrode 1, and the first tip 8 is electrically connected to the first electrode 1.

[0039] Refer to Figure 4 , the first through hole 31 includes: a fifth circular hole section 313 and a sixth circular hole section 314. Opposite ends of the sixth circular hole section 314 are respectively in communication with the fifth circular hole section 313 and the clamping cavity. The diameter of the sixth circular hole section 314 is smaller than the diameter of the first chuck 7. The first chuck 7 abuts against the bottom surface of the fifth circular hole section 313. By clamping the first chuck 7 on the bottom surface of the fifth circular hole section 313, the limitation of the first electrode 1 is achieved, preventing the first electrode 1 from exerting additional stress on the sheet-shaped insulating material 6, avoiding direct damage to the sheet-shaped insulating material 6 by the first tip 8, and also enabling precise positioning of the breakdown distance. The first electrode 1 can be in slight contact with the sheet-shaped insulating material 6 or not in contact by changing the length of the first tip 8.

[0040] Refer to Figure 5 , the embodiment of the present invention further includes: a second chuck 9 and a second tip 10; the second chuck 9 is respectively connected to the second tip 10 and the second electrode 2; the second tip 10 is electrically connected to the second electrode 2.

[0041] Refer to Figure 5, the second through hole 41 includes: a seventh circular hole section 413 and an eighth circular hole section 414. Opposite ends of the eighth circular hole section 414 are respectively in communication with the seventh circular hole section 413 and the clamping cavity. The diameter of the eighth circular hole section 414 is smaller than the diameter of the second chuck 9. The second chuck 9 abuts against the bottom surface of the seventh circular hole section 413. By clamping the second chuck 9 on the bottom surface of the seventh circular hole section 413, the limit of the second electrode 2 is achieved, so that the second electrode 2 does not generate additional stress on the sheet-shaped insulating material 6, avoiding direct damage to the sheet-shaped insulating material 6 by the second tip 10, and the precise positioning of the breakdown distance can also be achieved. The second electrode 2 can be slightly in contact with or not in contact with the sheet-shaped insulating material 6 by changing the length of the second tip 10.

[0042] In summary, the embodiment of the present invention provides a breakdown voltage test fixture and a breakdown voltage test device. By placing the sheet-shaped insulating material 6 between the first template 3 and the second template 4, the sheet-shaped insulating material 6 can be fixed between the first template 3 and the second template 4 by curing or buckling; then, the first electrode 1 is connected to the high-voltage transformer 11, and the wiring terminal 12 is connected to the second electrode 2. The first electrode 1 is placed in the first through hole 31, and the second electrode 2 is placed in the second through hole 41 to form a breakdown circuit; finally, the high-voltage transformer 11 outputs a voltage, and the output voltage parameters are continuously adjusted until the sheet-shaped insulating material 6 breaks down, and the output electric field parameters at the time of breakdown are recorded. By using the breakdown voltage test fixture of the present application, by avoiding direct contact between the electrode and the sheet-shaped insulating material 6, the problems that the stress damage of the electrode stress to the specimen in the existing breakdown field strength test technology causes deviation of the specimen breakdown voltage test result and the problem that the occurrence of surface flashover of the specimen during the measurement process causes errors in the test result are solved.

[0043] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A breakdown voltage test fixture, characterized in that For a sheet-shaped insulating material containing a rubber phase, comprising: a first electrode, a second electrode, a first template, and a second template; a clamping cavity for clamping the sheet-shaped insulating material is formed between the first template and the second template; a first through hole communicating with the clamping cavity is formed on the first template; a second through hole communicating with the clamping cavity is formed on the second template; the first electrode abuts against the first through hole; the second electrode abuts against the second through hole.

2. The breakdown voltage test fixture according to claim 1, characterized in that, The first template and the second template are arranged in parallel; the thickness of the clamping cavity is the same as the thickness of the sheet-shaped insulating material.

3. The breakdown voltage test fixture according to claim 1, characterized in that, The first electrode and the second electrode are spherical electrodes respectively.

4. The breakdown voltage test fixture according to claim 3, wherein The first through hole includes: a first circular hole section and a second circular hole section; opposite ends of the second circular hole section are respectively communicated with the first circular hole section and the clamping cavity; the diameter of the second circular hole section is smaller than the diameter of the first electrode; the first electrode abuts against the edge of the second circular hole section.

5. The breakdown voltage test fixture according to claim 3, characterized in that, The second through hole includes: a third circular hole section and a fourth circular hole section; opposite ends of the fourth circular hole section are respectively communicated with the third circular hole section and the clamping cavity; the diameter of the fourth circular hole section is smaller than the diameter of the second electrode; the second electrode abuts against the edge of the fourth circular hole section.

6. The breakdown voltage test fixture according to claim 1, wherein, Further comprising: A first chuck and a first tip; the first chuck is respectively connected to the first tip and the first electrode; The first tip is electrically connected to the first electrode.

7. The breakdown voltage test fixture according to claim 6, characterized in that, The first through hole includes: a fifth circular hole section and a sixth circular hole section; opposite ends of the sixth circular hole section are respectively communicated with the fifth circular hole section and the clamping cavity; the diameter of the sixth circular hole section is smaller than the diameter of the first chuck; the first chuck abuts against the bottom surface of the fifth circular hole section.

8. The breakdown voltage test fixture according to claim 1, wherein, Further comprising: A second chuck and a second tip; the second chuck is respectively connected to the second tip and the second electrode; The second tip is electrically connected to the second electrode.

9. The breakdown voltage test fixture according to claim 8, wherein, The second through hole includes: a seventh circular hole section and an eighth circular hole section; opposite ends of the eighth circular hole section are respectively communicated with the seventh circular hole section and the clamping cavity; the diameter of the eighth circular hole section is smaller than the diameter of the second chuck; the second chuck abuts against the bottom surface of the seventh circular hole section.

10. A breakdown voltage testing device, characterized in that, Comprising: A high-voltage transformer, a terminal for connection to the ground, and a breakdown voltage test fixture according to any one of claims 1-9; The high-voltage transformer is connected to the first electrode; the terminal is communicated with the second electrode.

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