Device for testing regional electrical performance of short samples of crisp and decayed mandrels

Abstract

The invention discloses a device for testing the regional electrical performance of a short sample of a crisp and rotten core rod. The device comprises a first grounding electrode plate, an insulating bracket, a plurality of test electrodes, a second grounding electrode plate and a plurality of contact terminals, the first grounding electrode plate and the second grounding electrode plate are both grounded; the contact terminals are arranged in a conductive manner; the insulating bracket is arranged on the first grounding electrode plate; the test electrode is vertically inserted into the insulation support, and the bottom of the test electrode abuts against the short sample of the crisp and rotten core rod placed on the first grounding electrode plate; the insulation support enables the test electrodes to be insulated from each other. A plurality of connecting through holes are formed in the second grounding electrode plate; the contact terminals are in one-to-one correspondence with the connecting through holes and are detachably connected to the connecting through holes; the contact terminals are in one-to-one correspondence with the test electrodes and abut against the upper ends of the test electrodes. According to the invention, the electrical performance of different areas on the short sample surface of the crisp and rotten core rod can be rapidly tested.

Description

Technical Field

[0001] The invention relates to the technical field of brittle core rod detection, in particular to a device for testing the electrical performance of a brittle core rod short sample in different regions. Background Art

[0002] The brittle degradation of composite insulators is an important topic in the current research on high-voltage external insulation. The change in the electrical performance parameters of the brittle core rod of the composite insulator is the direct cause of the abnormal heating of the brittle composite insulator. Obtaining the local electrical performance parameters of different areas of the brittle core rod and studying their differences is an important means to comprehensively obtain the brittle degradation characteristics of composite insulators and analyze the laws of fault development. Due to the large difference in the degree of degradation in different areas of the brittle core rod, the local electrical parameters show complex changes within a smaller scale. It is a relatively large challenge to accurately measure the local electrical performance parameters at different locations through a more feasible method. Summary of the invention

[0003] In order to overcome the deficiencies in the prior art, the present invention provides a device for testing the electrical properties of a short sample of a brittle mandrel in different regions, which has the advantage of quickly testing the electrical properties of different regions on the surface of a short sample of a brittle mandrel.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A device for testing the regional electrical performance of a short sample of a brittle mandrel, comprising a first grounding electrode plate, an insulating bracket, a plurality of test electrodes, a second grounding electrode plate and a plurality of contact terminals; the first grounding electrode plate and the second grounding electrode plate are both grounded; the contact terminals are conductively arranged; the insulating bracket is arranged on the first grounding electrode plate; the test electrodes are vertically inserted on the insulating bracket and their bottoms abut against the short sample of the brittle mandrel placed on the first grounding electrode plate; the insulating bracket insulates the test electrodes; a plurality of connecting through holes are formed on the second grounding electrode plate; the contact terminals correspond one-to-one to the connecting through holes and can be detachably connected to the connecting through holes; the contact terminals correspond one-to-one to the test electrodes and abut against the upper ends of the test electrodes.

[0006] By adopting the above technical scheme, any one of the test electrodes can be selected as the high-voltage electrode, and the remaining test electrodes are grounded through the second grounding electrode plate. The contact terminal corresponding to the test electrode serving as the high-voltage electrode is removed from the second grounding electrode plate, so that the connecting through hole on which the contact terminal is installed is in an open state, and then the high-voltage lead with an insulating sheath is passed through the opened connecting through hole; the high-voltage lead is connected to the test electrode at the corresponding position, so that high voltage is applied to the corresponding position on the upper surface of the short sample of the brittle core rod; in the above manner, the high-voltage lead passes through different connecting through holes and is connected to different test electrodes, so that high voltage is applied to different positions on the upper surface of the short sample of the brittle core rod, and on this basis, the DC body resistivity and AC loss of the short sample of the brittle core rod are tested, so as to obtain the radial and circumferential variation law of the local electrical properties of the short sample of the brittle core rod, so that the electrical properties of different areas on the surface of the short sample of the brittle core rod can be quickly tested.

[0007] Optionally, the test electrodes are arranged in a honeycomb shape.

[0008] By adopting the above technical solution, the test electrodes arranged in a honeycomb shape can accommodate a larger number of test electrodes in the same area, thereby increasing the test points and making the test more comprehensive.

[0009] Optionally, the test electrode is in the shape of a hexagonal column.

[0010] By adopting the above technical solution, the hexagonal columnar test electrode has greater overall strength due to the presence of edges. At the same time, the test electrode cooperates with the mounting hole adapted thereto, and the test electrode will not rotate easily, thereby making the test electrode more securely installed.

[0011] Optionally, the contact terminal includes a terminal body detachably connected to the connecting through hole and a magnetic sheet arranged at the lower side of the terminal body; the magnetic sheet is used to adsorb the upper end of the test electrode.

[0012] By adopting the above technical solution, the connection between the contact terminal and the test electrode is completed by adsorbing the test electrode through the magnetic sheet, so that good electrical contact can be achieved, which is beneficial to test stability.

[0013] Optionally, the contact terminal further includes a compression spring; the compression spring is connected between the terminal body and the magnetic sheet.

[0014] By adopting the above technical scheme, the compression spring can make the magnetic sheet close to the test electrode to achieve the adsorption of the magnetic sheet and the test electrode, thus ignoring the length error of the test electrode and the installation error of the contact terminal. In addition, the pressure of the compression spring can also make the bottom of the test electrode not easily separated from the short sample of the brittle core rod, reducing the possibility of displacement of the short sample of the brittle core rod.

[0015] Optionally, the terminal body and the connecting through hole are interference fit.

[0016] By adopting the above technical solution, the position of the terminal body is more stable, the conductive stability of the terminal body and the second grounding electrode plate is improved, and at the same time, there is no need to add another connecting structure to achieve the connection between the terminal body and the connecting through hole.

[0017] Optionally, the connecting through hole is hexagonal in shape; and the terminal body is a regular hexagonal column that matches the connecting through hole.

[0018] By adopting the above technical solution, the terminal body is not easy to rotate and the installation position is more stable.

[0019] Optionally, the insulating support includes a plurality of insulating support seats distributed up and down; adjacent insulating support seats are detachably connected.

[0020] By adopting the above technical solution, a plurality of insulating support seats distributed up and down are combined into an insulating support, and the insulating support seats can be increased or decreased according to the length of the short sample of the brittle core rod, thereby improving the flexibility of use and expanding the scope of use.

[0021] Optionally, the insulating support seat includes an insulating support plate and a plurality of evenly distributed insulating support columns fixed on the bottom surface of the insulating support plate; a plurality of evenly distributed connecting sockets are formed on the top surface of the insulating support plate; the connecting sockets correspond one-to-one with the insulating support columns and the connecting sockets and the insulating support columns on the corresponding side are coaxially arranged.

[0022] By adopting the above technical solution, the insulating support column of the upper insulating support seat is inserted into the connecting jack of the adjacent insulating support seat at the lower side, so that the insulating support is easy to assemble, and the insulating support seat is not easy to move horizontally, and the insulating support is more stable.

[0023] Optionally, all of the test electrodes form a test area facing the short sample of the brittle mandrel; the test area is larger than the upper end area of ​​the short sample of the brittle mandrel.

[0024] By adopting the above technical solution, the test area is larger than the upper end area of ​​the short sample of the brittle core rod, making the test more comprehensive. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention.

[0026] Figure 2 It is a schematic diagram of the exploded structure of the insulating support of the present invention.

[0027] Figure 3 It is a schematic structural diagram of the second grounding electrode plate of the present invention.

[0028] Figure 4 It is a schematic structural diagram of the contact terminal of the present invention.

[0029] Description of reference numerals:

[0030] 10. A first grounding electrode plate;

[0031] 20. Insulating bracket; 21. Insulating bracket seat; 22. Insulating support plate; 220. Connecting jack; 221. Supporting through hole; 23. Insulating support column;

[0032] 30. Test electrode;

[0033] 40. second ground electrode plate; 400. connecting through hole;

[0034] 50. contact terminal; 51. terminal body; 52. compression spring; 53. magnetic sheet;

[0035] 60. Short sample of brittle core rod. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-4 The present invention is described in further detail.

[0037] Embodiment 1: A device for testing the electrical performance of a short sample of a brittle mandrel in different regions is disclosed, referring to Figure 1 , including a first grounding electrode plate 10, an insulating support 20, 37 test electrodes 30, a second grounding electrode plate 40 and 37 contact terminals 50; the first grounding electrode plate 10 and the second grounding electrode plate 40 are made of conductive materials and are both grounded; the insulating support 20 is made of insulating material and is arranged on the first grounding electrode plate 10; the 37 test electrodes 30 are vertically inserted on the insulating support 20; the insulating support 20 separates the 37 test electrodes 30 from each other to achieve insulation between each other; the second grounding electrode plate 40 is formed with 37 vertically penetrating connecting through holes 400; the contact terminals 50 and the connecting through holes 400 The contact terminal 50 is detachably connected to the connecting through hole 400 and corresponds to each other one by one; the contact terminal 50 is made of a conductive material; the bottom of the contact terminal 50 and the test electrode 30 are against the upper end of the test electrode 30, so that the test electrode 30 is grounded to the second grounding electrode plate 40 through the contact terminal 50; during the test, a short sample of the rotten mandrel 60 is placed on the first grounding electrode plate 10, and the bottoms of all the test electrodes 30 are against the upper end of the short sample of the rotten mandrel 60, and at this time, all the test electrodes 30 form a test area facing the short sample of the rotten mandrel 60 and the test area is larger than the upper end area of ​​the short sample of the rotten mandrel 60. Among them, the first grounding electrode plate 10 and the second grounding electrode plate 40 are made of brass, and the insulating bracket 20 is made of a polymer organic material, such as polytetrafluoroethylene.

[0038] refer to Figure 1, 37 test electrodes 30 are arranged in a honeycomb shape, so that more test electrodes 30 can be arranged within a certain range, thereby increasing the test points, making the test more comprehensive, thereby improving the accuracy of the test, and ensuring that the bottom of each test electrode 30 contacts the upper end of the short sample 60 of the rotten core rod, so as to conduct the test in the largest range; in order to match the 37 test electrodes 30, the 37 connecting through holes 400 must also be arranged in a honeycomb shape. Of course, the 37 test electrodes 30 can also be arranged in other ways, such as taking one of the test electrodes 30 as the center, and then the remaining test electrodes 30 are arranged circumferentially along concentric circles of different diameters; or arranged in the form of rays; or arranged in the form of spirals; of course, the honeycomb arrangement is the best.

[0039] The contact terminal 50 includes a terminal body 51, a compression spring 52 and a magnetic sheet 53; the terminal body 51 is made of brass; the compression spring 52 is made of iron; the magnetic sheet 53 is made of Ru-Fe-B; one end of the compression spring 52 is fixed on the bottom surface of the terminal body 51, and the other end is adsorbed on the magnetic sheet 53; the terminal body 51 is interference fit with the connecting through hole 400; in order to adsorb with the magnetic sheet 53 and considering the conductivity of the test electrode 30, the material of the test electrode 30 is iron; when the contact terminal 50 is matched with the test electrode 30, the compression spring 52 presses the magnetic sheet 53 toward the test electrode 30, and the magnetic sheet 53 adsorbs the upper end of the test electrode 30. At this time, the elastic force of the compression spring 52 will also be transmitted to the short sample 60 of the brittle core rod, so that the short sample 60 of the brittle core rod is not easy to shift.

[0040] Working principle of embodiment 1: any one of the test electrodes 30 can be selected as the high-voltage electrode, and the other test electrodes 30 are grounded through the contact terminal 50 and the second grounding electrode plate 40. The contact terminal 50 corresponding to the test electrode 30 as the high-voltage electrode is removed from the second grounding electrode plate 40, so that the connecting through hole 400 where the contact terminal 50 is installed is in an open state, and then the high-voltage lead with an insulating sheath is passed through the opened connecting through hole 400; the high-voltage lead is connected to the test electrode 30 at the corresponding position, so that a high voltage is applied to the corresponding position on the upper surface of the short sample 60 of the brittle core rod. pressure; in order to increase the connection stability between the high-voltage lead and the test electrode 30 and thus achieve good electrical contact, a magnetic sheet can be placed between the high-voltage lead and the test electrode 30, and the magnetic sheet simultaneously adsorbs the high-voltage lead and the test electrode 30; according to the above principle, the high-voltage lead passes through different connecting through holes 400 and is connected to different test electrodes 30, thereby applying high voltage at different positions on the upper surface of the short sample 60 of the brittle core rod, and on this basis, the DC body resistivity and AC loss of the short sample 60 of the brittle core rod are tested, thereby obtaining the radial and circumferential variation law of the local electrical properties of the short sample 60 of the brittle core rod.

[0041] The above method is easy to connect and can conveniently realize rapid testing of the electrical properties of different areas on the surface of the short sample 60 of the brittle core rod; the honeycomb arrangement of the test electrodes 30 ensures a high coverage rate of the upper end area of ​​the short sample 60 of the brittle core rod while ensuring insulation from each other; when a certain test electrode 30 acts as a high-voltage electrode, the test electrodes 30 grounded around it can also play a certain shielding role, reducing the influence of surface leakage current on the test results.

[0042] Embodiment 2: The difference between Embodiment 2 and Embodiment 1 is: Figure 1 The insulating support 20 includes a plurality of insulating support seats 21 distributed vertically; adjacent insulating support seats 21 are detachably connected; thus, the insulating support seats 21 can be increased or decreased according to the actual length of the test electrode 30, for example Figure 1 Two insulating support seats 21 are used, which can be reduced to one or increased as needed.

[0043] refer to Figure 2 The insulating support seat 21 includes an insulating support plate 22 and four evenly distributed insulating support columns 23 fixed on the bottom surface of the insulating support plate 22; four evenly distributed connecting jacks 220 are formed on the top surface of the insulating support plate 22; the connecting jacks 220 correspond to the insulating support columns 23 one by one and the connecting jacks 220 and the insulating support columns 23 on the corresponding side are coaxially arranged; 37 supporting through holes 221 for the test electrode 30 to pass through are formed on the insulating support plate 22; when assembling in this way, the insulating support seat 21 is placed on the first grounding electrode plate 10, and then the insulating support seat 21 is placed upward in sequence. During the placement process, the four insulating support columns 23 of the insulating support seat 21 are inserted into the connecting jacks 220 of the insulating support seat 21 on the lower side, so that the insulating support seat 21 is not easy to move horizontally, and the entire insulating support 20 is more stable; of course, in order to make the insulating support 20 not easy to move horizontally, four bottom jacks for the four insulating support columns 23 of the insulating support seat 21 on the lower side to be inserted can be opened on the upper end surface of the first grounding electrode plate 10.

[0044] Embodiment 3: The difference between Embodiment 2 and Embodiment 2 is: Figure 1-Figure 3 The terminal body 51 and the test electrode 30 are in the shape of a regular hexagonal column. Of course, they can also be in the shape of a cylinder, but the regular hexagonal column is stronger than the cylinder. At the same time, the connecting through hole 400 can be set to a regular hexagonal hole shape that matches the terminal body 51, and the supporting through hole 221 can be set to a square hole shape that matches the test electrode 30. In this way, the regular hexagonal column and the regular hexagonal hole are matched to make the terminal body 51 and the test electrode 30 not easy to rotate.

[0045] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for testing the electrical performance of a short sample of a brittle mandrel in different regions, characterized in that: The invention comprises a first grounding electrode plate (10), an insulating support (20), a plurality of test electrodes (30), a second grounding electrode plate (40) and a plurality of contact terminals (50); the first grounding electrode plate (10) and the second grounding electrode plate (40) are both grounded; the contact terminals (50) are arranged to be conductive; the insulating support (20) is arranged on the first grounding electrode plate (10); the test electrodes (30) are vertically inserted on the insulating support (20) and their bottoms abut against a short sample of a brittle core rod (60) placed on the first grounding electrode plate (10); the insulating support (20) insulates the test electrodes (30); a plurality of connecting through holes (400) are formed on the second grounding electrode plate (40); the contact terminals (50) correspond one-to-one to the connecting through holes (400) and can be detachably connected to the connecting through holes (400); the contact terminals (50) correspond one-to-one to the test electrodes (30) and abut against the upper ends of the test electrodes (30).

2. The device for testing the electrical performance of a short sample of a brittle mandrel in different regions according to claim 1, characterized in that: The test electrodes (30) are arranged in a honeycomb shape.

3. The device for testing the electrical performance of a short sample of a brittle mandrel in different regions according to claim 1, characterized in that: The test electrode (30) is in the shape of a hexagonal column.

4. The device for testing the electrical performance of a short sample of a brittle mandrel in different regions according to claim 1, characterized in that: The contact terminal (50) comprises a terminal body (51) detachably connected to the connecting through hole (400) and a magnetic sheet (53) arranged on the lower side of the terminal body (51); the magnetic sheet (53) is used to adsorb the upper end of the test electrode (30).

5. The device for testing the electrical performance of a short sample of a brittle mandrel in different regions according to claim 4, characterized in that: The contact terminal (50) further comprises a compression spring (52); the compression spring (52) is connected between the terminal body (51) and the magnetic sheet (53).

6. The device for testing the electrical performance of a short sample of a brittle mandrel in different regions according to claim 4, characterized in that: The terminal body (51) and the connecting through hole (400) are interference fit.

7. The device for testing the electrical performance of a short sample of a brittle mandrel in different regions according to claim 4, characterized in that: The connecting through hole (400) is in a hexagonal shape; and the terminal body (51) is a regular hexagonal column that matches the connecting through hole (400).

8. The device for testing the electrical performance of a short sample of a brittle mandrel in different regions according to claim 1, characterized in that: The insulating support (20) comprises a plurality of insulating support seats (21) distributed vertically; adjacent insulating support seats (21) are detachably connected.

9. The device for testing the electrical performance of a short sample of a brittle mandrel in different regions according to claim 8, characterized in that: The insulating support seat (21) comprises an insulating support plate (22) and a plurality of evenly distributed insulating support columns (23) fixed on the bottom surface of the insulating support plate (22); a plurality of evenly distributed connecting jacks (220) are formed on the top surface of the insulating support plate (22); the connecting jacks (220) correspond one-to-one to the insulating support columns (23), and the connecting jacks (220) and the insulating support columns (23) on the corresponding side are coaxially arranged.

10. The device for testing the electrical performance of a short sample of a brittle mandrel in different regions according to claim 1, characterized in that: All of the test electrodes (30) form a test area facing the short brittle mandrel sample (60); the test area is larger than the upper end area of ​​the short brittle mandrel sample (60).

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