Insulation strength testing device

Abstract

The invention relates to an insulation strength testing device which comprises a testing cabin, an electrode assembly and a switching assembly, the testing cabin is of an openable and closable structure, an inner cavity of the testing cabin is divided into a plurality of testing cavities which are arranged in the circumferential direction and are mutually independent, and the testing cabin is connected with an oil injection pipe, an oil discharge pipe and an exhaust pipe which are communicated with the testing cavities; the electrode assemblies and the testing cavities are arranged in a one-to-one correspondence mode, each electrode assembly comprises a high-voltage electrode and a grounding electrode, the first ends of the high-voltage electrodes and the grounding electrodes are matched with each other in the testing cavities in a gap-adjustable mode to clamp a sample to be tested, the second ends of the grounding electrodes penetrate out of the testing cabin to be grounded, and the second ends of the high-voltage electrodes penetrate out of the testing cabin to serve as power receiving ends; the switching assembly is provided with a power supply end matched with the power receiving end, and the power supply end can rotate with the axis of the test cabin as the rotating axis so as to be electrically connected with the power receiving ends of the high-voltage electrodes alternately. The insulating strength testing device can be used for continuously testing a plurality of samples to be tested, so that the testing efficiency can be greatly improved, and the testing progress and the testing precision can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer manufacturing, and particularly relates to an insulation strength testing device. Background Art

[0002] In recent years, the performance of oil-paper insulation materials and the technical level of process treatment have been greatly improved. However, the allowable criterion for materials has not kept pace with the times. The research on the allowable insulation strength of materials is a difficult problem in the transformer industry, which limits the space for further optimization of products. The criterion for the longitudinal insulation strength of transformer windings under lightning impulse is an important part of the transformer insulation design system. In order to further verify the reliability of the longitudinal insulation of transformer windings under impulse conditions and then form the allowable criteria for different insulation coordination structures, it is of great significance for improving the quality and efficiency of products.

[0003] At present, the insulation strength testing device adopted needs to be statically placed for half an hour to four hours each time after installing the sample to be tested. When the number of samples to be tested is large, it takes too much time. Moreover, after the sample to be tested and the insulating oil are broken down during the test, the generated gas and impurities will diffuse into the insulating oil of the entire device, causing a large error in the subsequent test results. Therefore, after several tests of samples to be tested, it is necessary to filter the oil and statically place it again, which has a certain impact on the overall progress and results of the test. Summary of the Invention

[0004] The purpose of the present invention is to provide an insulation strength testing device, so that it can shorten the test time when the number of samples to be tested is large, improve the overall progress of the test, and reduce the error of the test results.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] An insulation strength testing device, comprising:

[0007] An openable and closable test chamber, the inner cavity of the test chamber is divided into a plurality of circumferentially arranged and independent test cavities, and the test chamber is connected with an oil injection pipe, an oil discharge pipe and an exhaust pipe communicated with each test cavity;

[0008] An electrode assembly, the electrode assembly is arranged in the test chamber corresponding to each test cavity, the electrode assembly includes a high-voltage electrode and a grounding electrode, the first ends of the high-voltage electrode and the grounding electrode are adjustably and cooperatively arranged with each other with a gap in the test cavity to serve as a clamping structure for clamping the sample to be tested, the second end of the grounding electrode penetrates out of the test chamber and is connected to a grounding wire, and the second end of the high-voltage electrode penetrates out of the test chamber as a power receiving end;

[0009] A switching component is used for electrically connecting an impact generator. The switching component has a power supply end adapted to the power receiving end. The power supply end can rotate with the axis of the test chamber as the rotation axis to alternately electrically connect with the power receiving ends of the high-voltage electrodes.

[0010] In an embodiment of the present application, the insulation strength testing device includes a plurality of the test chambers. Each of the test chambers is arranged coaxially and spaced apart vertically. The switching component includes a plurality of power supply ends corresponding to the test chambers one by one.

[0011] In an embodiment of the present application, the oil injection pipe of the test chamber located in the lower layer is communicated with the oil discharge pipe of the test chamber located in the upper layer.

[0012] In an embodiment of the present application, the electrode assemblies are circumferentially evenly distributed along the test chamber. And along the direction from top to bottom, the electrode assemblies of each test chamber are sequentially deflected by a preset angle in the circumferential direction. The preset angle is not equal to the circumferential angle between two adjacent high-voltage electrodes on the same test chamber, so that the electrode assemblies of each test chamber are sequentially arranged in a staggered manner in the circumferential direction. The included angle between the axes of two adjacent high-voltage electrodes on the same test chamber and the axis of the test chamber is the circumferential angle between two adjacent high-voltage electrodes on the same test chamber. The power supply ends of the switching component are sequentially spaced apart along the axial direction of the test chamber.

[0013] In an embodiment of the present application, the electrode assemblies are circumferentially evenly distributed along the test chamber. And the projections of the electrode assemblies of each test chamber on the projection plane perpendicular to the axial direction of the test chamber coincide. The power supply ends of the switching component are sequentially deflected by a preset angle in the circumferential direction along the direction from top to bottom, so that the power supply ends are sequentially arranged in a staggered manner in the circumferential direction. The preset angle is not equal to the circumferential angle between two adjacent high-voltage electrodes on the same test chamber. The included angle between the axes of two adjacent high-voltage electrodes on the same test chamber and the axis of the test chamber is the circumferential angle between two adjacent high-voltage electrodes on the same test chamber.

[0014] In an embodiment of the present application, the test chamber includes a circumferential outer chamber wall, a circumferential inner chamber wall, a chamber bottom and a chamber cover. The circumferential outer chamber wall and the circumferential inner chamber wall are coaxially sleeved outside the circumferential inner chamber wall. The chamber bottom is hermetically connected to the circumferential outer chamber wall and the circumferential inner chamber wall at the bottoms of the circumferential outer chamber wall and the circumferential inner chamber wall respectively. The chamber cover is hermetically and detachably connected to the circumferential outer chamber wall and the circumferential inner chamber wall at the tops of the circumferential outer chamber wall and the circumferential inner chamber wall respectively. The circumferential outer chamber wall, the circumferential inner chamber wall, the chamber bottom and the chamber cover enclose the inner cavity of the test chamber.

[0015] In one embodiment of the present application, each of the test chambers is coaxially connected up and down through a connecting cylinder, and the circumferentially inner side wall of the test chamber is sleeved outside the connecting cylinder.

[0016] In one embodiment of the present application, the high-voltage electrode and the ground electrode in the same electrode assembly are coaxially arranged, at least one of the high-voltage electrode and the ground electrode is in threaded fit connection with the test chamber, and / or at least one of the high-voltage electrode and the ground electrode includes an electrode main body and a feeding member, one end of the electrode main body is fixed to the test chamber, and the other end is in threaded fit connection with the feeding member.

[0017] In one embodiment of the present application, a first electrode base protruding radially from the wall surface of the circumferentially outer side wall of the test chamber is provided on the circumferentially outer side wall, and a second electrode base protruding radially from the wall surface of the circumferentially inner side wall or the connecting cylinder is provided on the circumferentially inner side wall and / or the connecting cylinder. One of the high-voltage electrode and the ground electrode in the same electrode assembly passes through the first electrode base and extends into the test cavity, and the other passes through the second electrode base and extends into the test cavity.

[0018] In one embodiment of the present application, the switching assembly further includes a indexing drive device for driving each of the power supply terminals to intermittently rotate at a preset angle.

[0019] In one embodiment of the present application, the indexing drive device includes a drive base and a transmission rod, the transmission rod is in transmission cooperation with the drive base, the transmission rod is coaxially arranged with the connecting cylinder inside the connecting cylinder, each of the power supply terminals is arranged at intervals along the axial direction of the transmission rod, and the transmission rod is used for electrically connecting the impact generator.

[0020] In one embodiment of the present application, an insulating handle for manually driving the transmission rod to rotate is connected to the transmission rod.

[0021] In one embodiment of the present application, a plurality of partition plates are arranged at intervals along the circumferential direction in the inner cavity, each of the partition plates divides the inner cavity into a plurality of test cavities arranged along the circumferential direction, a plurality of mounting members are respectively arranged at intervals along the circumferential direction on the opposite wall surfaces of the circumferentially outer side wall and the circumferentially inner side wall, the mounting members are provided with mounting grooves extending along the axial direction of the test chamber, and the two side edges of the partition plate are respectively in sliding fit with the mounting grooves on the circumferentially outer side wall and the circumferentially inner side wall to detachably arrange the partition plate in the test chamber.

[0022] In an embodiment of the present application, a ring-shaped grounding wire is provided at a position where the test chamber corresponds to the grounding electrode passing through the test chamber, and the ring-shaped grounding wire is electrically connected to each of the grounding electrodes.

[0023] In an embodiment of the present application, a U-shaped opening member is provided on one of the power supply end and the power receiving end. The opening of the U-shaped opening member faces the other of the power supply end and the power receiving end. The U-shaped opening member has two opposite conductive arms, and the two conductive arms are used to respectively contact and cooperate with the other of the power supply end and the power receiving end from both sides.

[0024] It can be seen from the above technical solutions that the present invention discloses an insulation strength testing device, which includes a test chamber, an electrode assembly, and a switching assembly. Among them, the test chamber is an openable and closable structure for placing and removing a sample to be tested. The inner cavity of the test chamber is divided into a plurality of circumferentially arranged and independent test cavities. The test chamber is connected with an oil injection pipe, an oil discharge pipe, and an exhaust pipe communicated with each test cavity. The electrode assembly is arranged in the test chamber corresponding to each test cavity. The electrode assembly includes a high-voltage electrode and a grounding electrode. The first end of the high-voltage electrode and the first end of the grounding electrode are adjustably matched with each other with a gap in the test cavity to serve as a clamping structure for clamping the sample to be tested. The second end of the grounding electrode passes out of the test chamber and is connected to the grounding wire, and the second end of the high-voltage electrode passes out of the test chamber to serve as the power receiving end; the switching assembly is used to electrically connect the impulse generator. The switching assembly has a power supply end adapted to the power receiving end, and the power supply end can rotate with the axis of the test chamber as the rotation axis to be alternately electrically connected to the power receiving ends of each high-voltage electrode.

[0025] During application, first open the test chamber, install the samples to be tested in each test cavity, then close the test chamber, connect the oil injection pipe to the oil outlet of the oil filter, connect the oil discharge pipe to the oil inlet of the oil filter, connect the exhaust pipe to the vacuum pumping device, start the vacuum pumping device to pump vacuum for each test cavity of the test chamber to the process time, then start the oil filter to inject insulating oil into each test cavity of the test chamber until each test cavity is filled, then let it stand for a preset time. After standing and confirming that the grounding wire is grounded and the switching assembly is electrically connected to the impulse generator, start the test. Turn on the impulse generator switch and the test system, rotate the switching assembly to connect the power supply end to the high-voltage electrode of one of the test cavities. The test system controls the impulse generator to use the first preset voltage value as the starting voltage and the second preset voltage value as the step voltage, and step up the voltage in a ladder until the sample to be tested breaks down. After the test system detects that the sample to be tested breaks down, record the test data, then rotate the switching assembly to connect the power supply end to the high-voltage electrode of an adjacent test cavity, and continuously repeat the above steps until all the samples to be tested in the test chamber are tested and record all the test results. After the test is completed, discharge the insulating oil in the test chamber through the oil discharge pipe for oil filtering treatment for later use.

[0026] In the above insulation strength testing device, the testing chamber is divided into a plurality of independent testing cavities. The samples to be tested and the insulating oil are placed independently in each testing cavity. When the number of samples to be tested is large, the samples to be tested can be installed uniformly and filled with oil uniformly, effectively shortening the static placement time after oil filling. At the same time, after the samples to be tested and the insulating oil in one testing cavity are broken down, they will not contaminate the samples to be tested and the oil in other testing cavities, which can improve the error of the test results and enhance the accuracy of the test data. Moreover, after one test is completed, by rotating the switching component, the next sample to be tested can be quickly tested, and multiple samples to be tested can be tested continuously without static placement again, which can greatly improve the test efficiency and promote the test progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 The front view of the insulation strength testing device provided by the embodiment of the present invention;

[0029] Figure 2 The top view of the insulation strength testing device provided by the embodiment of the present invention;

[0030] Figure 3 The sectional view of the insulation strength testing device provided by the embodiment of the present invention;

[0031] Figure 4 The structural schematic diagram of the testing chamber of the insulation strength testing device provided by the embodiment of the present invention before closing;

[0032] Figure 5 The top view of the testing chamber of the insulation strength testing device provided by the embodiment of the present invention before closing;

[0033] Figure 6 For Figure 5 The partial enlarged schematic diagram at A in

[0034] In the figure:

[0035] 100 is the testing chamber; 110 is the circumferential outer side wall; 111 is the first mounting member; 120 is the circumferential inner side wall; 121 is the second mounting member; 130 is the chamber bottom; 140 is the chamber cover; 150 is the partition board; 160 is the oil injection pipe; 170 is the oil discharge pipe; 180 is the exhaust pipe;

[0036] 200 is the electrode assembly; 210 is the high-voltage electrode; 220 is the grounding electrode;

[0037] 300 is the switching assembly; 310 is the driving base; 320 is the transmission rod; 330 is the power supply terminal; 331 is the first power supply terminal; 332 is the second power supply terminal; 340 is the insulating handle; 350 is the U-shaped opening member;

[0038] 400 is the annular grounding wire; 500 is the connecting cylinder; 600 is the first electrode base; 700 is the second electrode base; 800 is the connecting pipe; 900 is the support base; 1000 is the sample to be tested. Detailed implementation manners

[0039] The core of the present invention is to provide an insulation strength testing device. The structural design of the insulation strength testing device enables it to shorten the test time when the number of samples to be tested is large, improve the overall progress of the test, and reduce the error of the test results.

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] Please refer to Figures 1 to 5 。

[0042] An insulation strength testing device is provided in an embodiment of the present application. The insulation strength testing device includes a test chamber 100, an electrode assembly 200, and a switching assembly 300.

[0043] Among them, the test chamber 100 is a structure that can be opened and closed to place and take out the sample to be tested 1000. The test chamber 100 is made of a transparent high-strength material. The inner cavity of the test chamber 100 is divided into a plurality of circumferentially arranged and independent test cavities. The test chamber 100 is connected with an oil injection pipe 160, an oil discharge pipe 170, and an exhaust pipe 180 that communicate with each test cavity. Each test cavity can be completely the same, that is, the shape and size of the test cavity are completely the same. Each test cavity can also be different. For example, at least the shape, size, or number of the test cavities can be different from those of other test cavities. An oil injection valve can be provided on the oil injection pipe 160, an oil discharge valve can be provided on the oil discharge pipe 170, and an exhaust valve can be provided on the exhaust pipe 180. When injecting oil, the oil injection valve is opened, and the oil discharge valve and the exhaust valve are closed. When discharging oil, the oil discharge valve, the exhaust valve, and the oil injection valve are opened. During the test, the oil injection valve, the exhaust valve, and the oil discharge valve are all closed.

[0044] The electrode assemblies 200 are arranged in the test chamber 100 in one-to-one correspondence with the test cavities, that is, a set of electrode assemblies 200 is arranged in each test chamber 100. The electrode assembly 200 includes a high-voltage electrode 210 and a ground electrode 220. The first ends of the high-voltage electrode 210 and the ground electrode 220 are adjustably and cooperatively arranged with a gap in the test cavity to serve as a clamping structure for clamping the sample to be tested 1000. The second end of the ground electrode 220 passes out of the test chamber 100 and is connected to a ground wire, and the second end of the high-voltage electrode 210 passes out of the test chamber 100 to serve as a power receiving end.

[0045] As Figures 1 to 5 shown, in the embodiment of the present application, both the high-voltage electrode 210 and the ground electrode 220 of the electrode assembly 200 are in a straight rod shape and are coaxial. In this case, the electrode assembly 200 can be arranged along the axial direction of the test chamber 100, or can be arranged along the radial direction of the test chamber 100, or the electrode assembly 200 can be arranged at an angle with the axial or radial direction of the test chamber 100.

[0046] Of course, the high-voltage electrode 210 and the ground electrode 220 of the electrode assembly 200 are not necessarily in a straight rod shape. In other embodiments, the high-voltage electrode 210 and the ground electrode 220 of the electrode assembly 200 can also be in an L-shaped rod, or the high-voltage electrode 210 and the ground electrode 220 can also be in a shape combined with a rod and a plate, or one of the high-voltage electrode 210 and the ground electrode 220 is in a rod shape and the other is in a plate shape, which is not limited herein.

[0047] The switching assembly 300 is used to connect the impact generator. The switching assembly 300 has a power supply end 330 adapted to the power receiving end. The power supply end 330 can rotate with the axis of the test chamber 100 as the rotation axis to be alternately electrically connected to the power receiving ends of the high-voltage electrodes 210. According to the structure of the test chamber 100, the power supply end 330 of the switching assembly 300 can be located at the top, bottom, inside or outside of the test chamber 100. As Figures 1 to 5 shown in the embodiment, the test chamber 100 is in a ring structure, and the power supply end 330 of the switching assembly 300 is located inside the test chamber 100.

[0048] During use, first open the test chamber 100 and install the test sample 1000 in each test cavity. Then close the test chamber 100, connect the oil filling pipe 160 to the oil outlet of the oil filter, connect the oil drain pipe 170 to the oil inlet of the oil filter, and connect the exhaust pipe 180 to the vacuum equipment. After starting the vacuum equipment and evacuating each test cavity of the test chamber 100 for the process time, start the oil filter and inject insulating oil into each test cavity of the test chamber 100 until each test cavity is filled. Then, let it stand for a preset time. This will ensure that the gas in the insulating oil is completely discharged, avoiding the influence of the presence of gas on the accuracy of the test results. Only after the gas in the insulating oil is completely discharged can the test be conducted to accurately reflect the insulation strength.

[0049] After the static placement is completed and the grounding of the wiring is confirmed, and the switching component 300 is electrically connected to the impact generator, the test begins. The impact generator switch and the test system are turned on, and the switching component 300 is rotated to connect the power supply end 330 to the high-voltage electrode 210 of one of the test chambers. The test system controls the impact generator to use the first preset voltage value as the starting voltage and the second preset voltage value as the step voltage, stepping up the voltage until the test sample 1000 breaks down. After the test system detects the breakdown of the test sample 1000, it records the test data, then rotates the switching component 300 to connect the power supply end 330 to the high-voltage electrode 210 of another adjacent test chamber. The above steps are repeated continuously until all test samples 1000 in the test chamber 100 are tested and all test results are recorded. After the test is completed, the insulating oil in the test chamber 100 is drained through the oil drain pipe 170 for oil filtration and standby.

[0050] Compared with the prior art, the test chamber 100 in the insulation strength testing device provided in the embodiment of the present application is divided into multiple independent test chambers, and the test samples 1000 and insulating oil are placed independently in each test chamber. When the number of test samples 1000 is large, the test samples 1000 can be installed uniformly and filled with oil uniformly, which effectively shortens the static time after oil filling. At the same time, the test samples 1000 and insulating oil in one test chamber will not cause pollution to the test samples 1000 and oil in other test chambers after the breakdown, which can improve the error of the test results and enhance the accuracy of the test data. After a test is completed, the next test sample 1000 can be quickly tested by rotating the switching component 300, and multiple test samples 1000 can be tested uninterruptedly without the need for static placement again, which can greatly improve the test efficiency and speed up the test progress.

[0051] When there are a large number of samples 1000 to be tested, the test chamber 100 needs to have a corresponding number of test cavities. However, the number of test cavities in the test chamber 100 cannot be increased without limit. Having too many test cavities in one test chamber 100 will result in the test chamber 100 occupying too much floor space. Therefore, to improve the test efficiency and speed up the test process, the insulation strength test device may include multiple test chambers 100. Each test chamber 100 is arranged coaxially and spaced apart vertically. The test chamber 100 located at the lowest layer is arranged on the support base 900. By using the vertical space to arrange multiple test chambers 100, the number of test cavities can be increased, and more samples 1000 to be tested can be accommodated. The space between two test chambers 100 needs to be large enough to reserve space for placing and removing the samples 1000 in the lower test chamber 100. To be adapted to the test chambers 100 arranged in a stacked manner up and down, the switching component 300 includes multiple power supply terminals 330 corresponding to the test chambers 100 one by one. It can be foreseen that each power supply terminal 330 also needs to be arranged at intervals vertically.

[0052] In the above embodiment, each test chamber 100 can adopt exactly the same structure, that is, the shapes, sizes, and numbers of the test cavities in each test chamber 100, as well as the arrangement positions and numbers of the oil injection pipes 160 and the oil discharge pipes 170 are exactly the same. It can also adopt different structures. For example, the outer shapes of each test chamber 100 can be not completely the same, and the shapes, sizes, and numbers of the test cavities in each test chamber 100 can be not completely the same, etc. However, for the convenience of the switching component 300 to operate automatically, it is best to arrange the electrode assemblies 200 of the test chambers 100 circumferentially and evenly, and the circumferential angles of the electrode assemblies 200 of each test chamber 100 are the same. The included angle between the axis connecting the axes of two adjacent high-voltage electrodes 210 on the same test chamber 100 and the axis of the test chamber 100 is the circumferential angle between two adjacent high-voltage electrodes 210 on the same test chamber 100.

[0053] Correspondingly, the setting methods of the electrode assemblies 200 on each test chamber 100 can be exactly the same or can adopt different setting methods. Only the corresponding power supply terminals 330 on the switching component 300 need to be adjusted accordingly.

[0054] As Figure 1 、 Figure 3 and Figure 4 shown, the insulation strength test device in the present application includes two test chambers 100, and the two test chambers 100 adopt exactly the same structure, that is, the sizes, shapes, and numbers of the test cavities in the two test chambers 100 are exactly the same.

[0055] Since the present application adopts a structure with multiple test chambers 100 arranged up and down, the oil injection and oil discharge efficiency of each test chamber 100 alone is relatively low. Therefore, for the convenience of oil injection and oil discharge, as Figure 1 、 Figure 3 andFigure 4 As shown, the oil injection pipe 160 of the test chamber 100 located in the lower layer is communicated with the oil discharge pipe 170 of the test chamber 100 located in the upper layer. Preferably, in order to improve the oil injection efficiency, a plurality of oil discharge pipes 170 can be provided on the test chamber 100 in the upper layer. Correspondingly, a plurality of oil injection pipes 160 are provided on the test chamber 100 in the lower layer. Each oil injection pipe 160 of the test chamber 100 in the lower layer is communicated with each oil discharge pipe 170 of the test chamber 100 in the upper layer through a communication pipe 800 in a one-to-one correspondence.

[0056] During oil injection, the oil discharge valve on the oil discharge pipe 170 of the test chamber 100 in the upper layer is opened, and the oil injection valve on the oil injection pipe 160 is opened. The oil discharge valve on the oil discharge pipe 170 of the lowermost test chamber 100 is closed, and the oil injection valve on the oil injection pipe 160 is opened. After the oil injection is completed, the oil discharge valves on the oil discharge pipes 170 of each test chamber 100 and the oil injection valves on the oil injection pipes 160 are all closed. During oil discharge, the oil discharge valves on the oil discharge pipes 170 of each test chamber 100 and the oil injection valves on the oil injection pipes 160 are all opened.

[0057] It should be noted that the tests of the test samples 1000 in each test chamber 100 are not carried out synchronously. Instead, after the test of the test sample 1000 in one test cavity of one test chamber 100 is completed, the test of the test sample 1000 in one test cavity of another test chamber 100 is carried out, that is, the tests are alternately carried out in the order from top to bottom or from bottom to top. To achieve this purpose, in an embodiment of the present application, the electrode assemblies 200 are evenly distributed along the circumferential direction of the test chamber 100, and along the direction from top to bottom, the electrode assemblies 200 of each test chamber 100 are sequentially deflected by a preset angle along the circumferential direction. The preset angle is not equal to the circumferential angle between two adjacent high-voltage electrodes 210 on the same test chamber 100. The preset angle can be greater than or less than the circumferential angle between the two high-voltage electrodes 210, so that the electrode assemblies 200 of each test chamber 100 are arranged in a staggered manner in the circumferential direction. The included angle between the connection line of the axes of two adjacent high-voltage electrodes 210 on the same test chamber 100 and the axis of the test chamber 100 is the circumferential angle between two adjacent high-voltage electrodes 210 on the same test chamber 100, that is, on the projection plane perpendicular to the axis of the test chamber 100, the electrode assemblies 200 of each test chamber 100 do not coincide, and the power supply terminals 330 of the switching assembly 300 are sequentially arranged at intervals along the axial direction of the test chamber 100.

[0058] Specifically, at the beginning of the test, one power supply terminal 330 at the uppermost end of the switching component 300 is in contact and cooperation with one high-voltage electrode 210 of the uppermost test chamber 100. At this time, since the electrode assemblies 200 of each test chamber 100 are arranged in a circumferentially offset manner in sequence, and the electrode assemblies 200 of each test chamber 100 are deflected by a preset angle along the circumferential direction in sequence, therefore, except for one power supply terminal 330 at the uppermost end of the switching component 300, the other power supply terminals 330 cannot be in contact and cooperation with the power receiving end of the high-voltage electrode 210 of the corresponding test chamber 100. When the test of the sample 1000 to be tested in one test chamber of the uppermost test chamber 100 is completed, the switching component 300 is rotated by a preset angle, and one power supply terminal 330 below the uppermost power supply terminal 330 of the switching component 300 is in contact with the power receiving end of the high-voltage electrode 210 of the corresponding test chamber 100, and the other power supply terminals 330 are not in contact with the high-voltage electrode 210 of the corresponding test chamber 100. And so on until the switching component 300 rotates one week.

[0059] In addition to arranging the electrode assemblies 200 of each test chamber 100 in a circumferentially offset manner, the power supply terminals 330 of the switching component 300 can also be arranged in a circumferentially offset manner. In another embodiment of the present application, the electrode assemblies 200 are evenly distributed along the circumferential direction of the test chamber 100, and the projections of the electrode assemblies 200 of each test chamber 100 on the projection plane perpendicular to the axial direction of the test chamber 100 coincide. The power supply terminals 330 of the switching component 300 are deflected by a preset angle along the circumferential direction in sequence from top to bottom, so that the power supply terminals 330 are arranged in a circumferentially offset manner in sequence. The preset angle is not equal to the circumferential angle between two adjacent high-voltage electrodes 210 on the same test chamber 100, that is, the preset angle is greater than or less than the circumferential angle between two adjacent high-voltage electrodes 210 on the same test chamber 100.

[0060] Such as Figure 2 、 Figure 3 and Figure 5 shown, in the illustrated embodiment, the insulation strength test device includes two test chambers 100. Correspondingly, the switching component 300 includes two power supply terminals 330, namely a first power supply terminal 331 and a second power supply terminal 332. The preset angle between the first power supply terminal 331 and the second power supply terminal 332 is one-half of the circumferential angle between two adjacent high-voltage electrodes 210 on the same test chamber 100. At the positions shown in Figure 2 and Figure 5 the first power supply terminal 331 is in contact and cooperation with the power receiving end of the high-voltage electrode 210 of one test chamber of the upper test chamber 100, and the second power supply terminal 332 is not in contact with the high-voltage electrode 210 of the lower test chamber 100. When the test of the sample 1000 to be tested in one test chamber of the upper test chamber 100 is completed, the switching component 300 rotates clockwise ( Figure 2 and Figure 5Rotate by a preset angle. At this time, the first power supply terminal 331 is separated from the power receiving end of the high-voltage electrode 210 in a test chamber of the upper test chamber 100, and the second power supply terminal 332 contacts the power receiving end of the high-voltage electrode 210 in a test chamber of the lower test chamber 100. After the test sample 1000 in a test chamber of the lower test chamber 100 is tested, the switching component 300 rotates clockwise by the preset angle again. At this time, the first power supply terminal 331 contacts and cooperates with the power receiving end of the high-voltage electrode 210 in another test chamber of the upper test chamber 100, and the second power supply terminal 332 is separated from the power receiving end of the high-voltage electrode 210 in the lower test chamber 100. In this way, the cycle continues until all the test samples 1000 in each test chamber of the upper test chamber 100 and the lower test chamber 100 are completely tested.

[0061] Please refer to Figures 1 to 3 , in an embodiment of the present application, the test chamber 100 adopts an annular structure, that is, the test chamber 100 includes a circumferential outer side wall 110, a circumferential inner side wall 120, a chamber bottom 130, and a chamber cover 140. The circumferential outer side wall 110 and the circumferential inner side wall 120 are coaxially sleeved outside the circumferential inner side wall 120. The chamber bottom 130 is hermetically connected to the circumferential outer side wall 110 and the circumferential inner side wall 120 at the bottoms of the circumferential outer side wall 110 and the circumferential inner side wall 120 respectively. The chamber cover 140 is hermetically and detachably connected to the circumferential outer side wall 110 and the circumferential inner side wall 120 at the tops of the circumferential outer side wall 110 and the circumferential inner side wall 120 respectively. The circumferential outer side wall 110, the circumferential inner side wall 120, the chamber bottom 130, and the chamber cover 140 enclose the inner cavity of the test chamber 100.

[0062] Sealing structures are respectively provided between the chamber bottom 130 and the circumferential outer side wall 110 and the circumferential inner side wall 120, and between the chamber cover 140 and the circumferential outer side wall 110 and the circumferential inner side wall 120. The chamber cover 140 is connected to the circumferential outer side wall 110 and the circumferential inner side wall 120 by a plurality of threaded fasteners evenly distributed at intervals in the circumferential direction.

[0063] When there are multiple test chambers 100 as described above, in order to ensure the stability of the test chamber 100 and at the same time not affect the opening and closing of each test chamber 100 and the taking and placing of the test sample 1000, as Figures 1 to 4 shown, each test chamber 100 is coaxially connected up and down through a connecting cylinder 500. The circumferential inner side wall 120 of the test chamber 100 is sleeved outside the connecting cylinder 500. The connecting cylinder 500 adopts a non-variable diameter structure, that is, the cross-sections of the connecting cylinder 500 at various positions in the axial direction are exactly the same to ensure that each test chamber 100 can be coaxially arranged.

[0064] For the convenience of operating the clamping structure formed by the first end of the high-voltage electrode 210 and the first end of the grounding electrode 220, the high-voltage electrode 210 and the grounding electrode 220 in the same electrode assembly 200 are coaxially arranged, and at least one of the high-voltage electrode 210 and the grounding electrode 220 is threadedly engaged and connected to the test chamber 100. In Figure 5 and Figure 6 In the illustrated embodiment, the high-voltage electrode 210 and the grounding electrode 220 in the same electrode assembly 200 are coaxial and arranged radially with respect to the test chamber 100. Of course, in other embodiments, the high-voltage electrode 210 and the grounding electrode 220 in the same electrode assembly 200 may also be arranged axially with respect to the test chamber 100, or arranged in other directions other than the radial and axial directions, which are not limited herein.

[0065] Please continue to refer to Figure 5 and Figure 6 , in this embodiment, the high-voltage electrode 210 is fixedly arranged relative to the test chamber 100, the grounding electrode 220 is threadedly engaged and connected to the test chamber 100, and the second section of the grounding electrode 220 extends out of the test chamber 100 as an operating end. During the test, the grounding electrode 220 is rotated through the operating end to make its first end approach or move away from the first end of the high-voltage electrode 210, so as to clamp and release the sample to be tested 1000.

[0066] Of course, the operation of the clamping structure can also be realized in other ways. In one embodiment, at least one of the high-voltage electrode 210 and the grounding electrode 220 includes an electrode body and a feeding member. One end of the electrode body is fixed to the test chamber 100, and the other end is threadedly engaged and connected to the feeding member. During the test, by rotating the feeding member, it is helically fed relative to the electrode body, so as to realize the clamping and release of the sample to be tested 1000 by the clamping structure.

[0067] Of course, the above two schemes can be adopted simultaneously, that is, while at least one of the high-voltage electrode 210 and the grounding electrode 220 is threadedly engaged and connected to the test chamber 100, at least one of the high-voltage electrode 210 and the grounding electrode 220 includes an electrode body and a feeding member. One end of the electrode body is fixed to the test chamber 100, and the other end is threadedly engaged and connected to the feeding member.

[0068] To improve the stability of the clamping of the sample to be tested 1000 by the high-voltage electrode 210 and the grounding electrode 220, a clamping plate is provided at the first end of at least one of the high-voltage electrode 210 and the grounding electrode 220, and the area of the clamping plate is larger than the cross-sectional area of the high-voltage electrode 210 and the grounding electrode 220.

[0069] To increase the stability of the high-voltage electrode 210 and the grounding electrode 220, as Figures 4 to 6As shown, a first electrode base 600 protruding radially from the wall surface of the circumferential outer bulkhead 110 along the test chamber 100 is provided on the circumferential outer bulkhead 110. The first electrode base 600 can be provided on the inner wall surface and / or the outer wall surface of the circumferential outer bulkhead 110. A second electrode base 700 protruding radially from the wall surface of the circumferential inner bulkhead 120 or the connecting cylinder 500 along the test chamber 100 is provided on the circumferential inner bulkhead 120 and / or the connecting cylinder 500. Since the circumferential inner bulkhead 120 is sleeved on the connecting cylinder 500, that is, the outer wall surface of the circumferential inner bulkhead 120 is in contact and cooperation with the outer wall surface of the connecting cylinder 500, the second electrode base 700 can be provided on the inner wall surface of the circumferential inner bulkhead 120 and / or the inner wall surface of the connecting cylinder 500. One of the high-voltage electrode 210 and the ground electrode 220 in the same electrode assembly 200 penetrates through the first electrode base 600 and extends into the test chamber, and the other penetrates through the second electrode base 700 and extends into the test chamber. By providing the first electrode base 600 and the second electrode base 700, the contact area between the high-voltage electrode 210 and the ground electrode 220 and the test chamber 100 can be increased, thereby improving the stability of the high-voltage electrode 210 and the ground electrode 220.

[0070] Since in this application, the test chambers of the test chamber 100 are circumferentially evenly distributed, the switching assembly 300 further includes a indexing drive device for driving each power supply terminal 330 to intermittently rotate at a preset angle, that is, after a preset time interval, the indexing drive device drives each power supply terminal 330 to rotate through a preset angle to achieve automatic switching of the switching assembly 300. The preset time interval is greater than the time required for the high-voltage electrode 210 to start being energized until the test sample 1000 is broken down.

[0071] Specifically, as Figure 3 shown, the indexing drive device includes a drive base 310 and a transmission rod 320. The transmission rod 320 is in transmission cooperation with the drive base 310. The transmission rod 320 is coaxially arranged in the connecting cylinder 500 with the connecting cylinder 500. Each power supply terminal 330 is arranged at intervals along the axial direction of the transmission rod 320. The transmission rod 320 is used for electrically connecting the impulse generator.

[0072] As Figure 2 and Figure 3 shown, in a specific embodiment of this application, each power supply terminal 330 is also rod-shaped and is arranged on the transmission rod 320 along the radial direction of the transmission rod 320.

[0073] Furthermore, as Figures 1 to 3 shown, the transmission rod 320 is connected with an insulating handle 340 for manually driving the transmission rod 320 to rotate. The user can rotate the transmission rod 320 through the insulating handle 340 to achieve switching.

[0074] Please refer to Figures 4 to 6, a plurality of partition plates 150 are arranged at intervals in the circumferential direction in the inner cavity, and each partition plate 150 divides the inner cavity into a plurality of test cavities arranged in the circumferential direction. The test chamber 100 can be provided with an oil injection pipe 160 and an oil discharge pipe 170 for each test cavity, but this will result in a large number of pipes. To reduce the number of pipes connected to the test chamber 100, in the above embodiment, the test chamber 100 is only provided with one oil injection pipe 160. In this case, the partition plate 150 needs to adopt a detachable structure, or some of the partition plates 150 adopt a detachable structure, and the others are fixed structures.

[0075] Specifically, in order to facilitate the disassembly and assembly of the partition plate 150, a plurality of mounting members are respectively arranged at intervals in the circumferential direction on the opposing wall surfaces of the circumferential outer wall 110 and the circumferential inner wall 120. The mounting members are provided with mounting grooves extending along the axial direction of the test chamber 100. The two side edges of the partition plate 150 are respectively in sliding fit with the mounting grooves on the circumferential outer wall 110 and the circumferential inner wall 120, so as to detachably arrange the partition plate 150 in the test chamber 100.

[0076] Furthermore, a sealing structure can also be provided between the partition plate 150 and the two side walls of the mounting groove, between the partition plate 150 and the bottom of the chamber 130, and between the partition plate 150 and the chamber cover 140, so as to better block the flow of insulating oil in adjacent two test cavities.

[0077] As Figure 6 shown, a first mounting member 111 is arranged on the wall surface of the circumferential outer wall 110 facing the circumferential inner wall 120, a second mounting member 121 is arranged on the wall surface of the circumferential inner wall 120 facing the circumferential outer wall 110, and the mounting grooves on the first mounting member 111 and the second mounting member 121 corresponding to each other in the radial direction of the test chamber 100 are arranged oppositely. The two side edges of the partition plate 150 are respectively in sliding fit with the mounting grooves of the first mounting member 111 and the second mounting member 121 corresponding to each other in the radial direction of the test chamber 100.

[0078] As Figure 5 shown, in a specific embodiment of the present application, 10 circumferentially evenly distributed test cavities are arranged in the test chamber 100. Therefore, the central angle between adjacent two partition plates 150 is 36°. Correspondingly, the circumferential included angle between adjacent two high-voltage electrodes 210 in the same test chamber 100 is also 36°. The included angle between the first power supply end 331 and the second power supply end 332 of the switching assembly 300 is 18°. Of course, in other embodiments, the included angle between the first power supply end 331 and the second power supply end 332 of the switching assembly 300 can also be 54°.

[0079] Before refueling, first open the test chamber 100, remove all the partition plates 150 in the test chamber 100, then close the test chamber 100 and refuel the test chamber 100. After the refueling is completed, open the test chamber 100 again, reinstall the partition plates 150, and close the test chamber 100 for static placement.

[0080] As Figure 1 shown, a ring-shaped ground wire 400 is arranged at the position where the test chamber 100 corresponds to the ground electrode 220 passing through the test chamber 100. The ring-shaped ground wire 400 is electrically connected to each ground electrode 220. During the test, each ground electrode 220 is grounded through the ring-shaped ground wire 400.

[0081] To ensure a stable electrical connection between the power supply end 330 and the power receiving end, in an embodiment of the present application, a U-shaped opening member 350 is arranged on one of the power supply end 330 and the power receiving end. The opening of the U-shaped opening member 350 faces the other of the power supply end 330 and the power receiving end. The U-shaped opening member 350 has two opposite conductive arms, and the two conductive arms are used to respectively contact and cooperate with the other of the power supply end 330 and the power receiving end from both sides. The U-shaped opening member 350 can ensure full contact between the power supply end 330 and the power receiving end and achieve a stable electrical connection.

[0082] In summary, the working process of the insulation strength testing device provided by the embodiment of the present application is as follows:

[0083] 1. Connect the high-voltage end of the impulse generator to the transmission rod 320 using a wire, that is, the impulse generator is conducted through the transmission rod 320 to the first power supply end 331 and the second power supply end 332, and then ground the ring-shaped ground wire 400 to form the circuit loop of the entire test.

[0084] 2. Prepare 20 pieces of samples 1000 to be tested and perform a normal drying process.

[0085] 3. Open the test chamber 100. Since the number of oil injection pipes connected to the test chamber in this embodiment is small, in order to fill the inner cavity of the test chamber with insulating oil, the partition plates 150 are not installed in the test chamber 100 at this time. Put 20 pieces of samples 1000 to be tested into the clamping structure formed by the first ends of each high-voltage electrode 210 and the ground electrode 220 to make the samples 1000 to be tested firm and reliable, and close the test chamber 100 to ensure its sealing performance.

[0086] 4. Connect the exhaust pipe 180 to the vacuum pumping equipment, connect the oil injection pipe 160 to the oil outlet of the oil filter, evacuate to the process time and then inject oil until both the upper and lower test chambers 100 are filled.

[0087] 5. Open the test chamber 100 again, insert all 20 partitions 150, and then close the test chamber 100 again to form 20 independent test chambers in the upper and lower layers, and then place them in a static state.

[0088] 6. After the preset time of rest, start the test. First, connect the first power supply end 331 to a high-voltage electrode 210 in a test cavity in the upper test cabin 100. At the same time, the second power supply end 332 is disconnected from the high-voltage electrode 210 in the lower test cabin 100. Then turn on the impact generator switch and the test system. Use 0.3 times the theoretical voltage value as the starting voltage and 0.05 times the theoretical voltage value as the step voltage. Step by step, increase the voltage until the sample 1000 to be tested breaks down. At the same time, the test system will automatically and synchronously identify and record the breakdown moment. After that, the test system controls or manually controls the switching component 300 to rotate 18°, so that the second power supply end 332 is connected to a high-voltage electrode 210 in a test cavity in the lower test cabin 100, completing the establishment of the test circuit of the second sample 1000 to be tested. At the same time, the other samples 1000 to be tested are in a disconnected state. The test system continues to pressurize according to the above method until the sample 1000 to be tested breaks down. The above steps are repeated until all 20 samples 1000 to be tested have completed the breakdown, and the experimental data are recorded.

[0089] 7. After all tests are completed, connect the oil drain pipe 170 to the oil inlet of the oil filter, filter the insulating oil after breakdown and prepare it for use, and clean the test chamber 100.

[0090] As used in this application and the claims, unless the context clearly indicates an exception, the terms "a," "an," "an," and / or "the" are not intended to refer to the singular and may include the plural, unless the context clearly indicates otherwise. Generally speaking, the terms "comprises" and "include" only indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list. A method or apparatus may also include other steps or elements. The phrase "comprises a..." does not preclude the presence of additional identical elements in the process, method, product, or apparatus that includes the elements.

[0091] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0092] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0093] In this article, specific examples are used to elaborate on the principles and implementation modes of the present invention. The description of the above embodiments is only used to help understand the core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. An insulation strength testing device, characterized in that, Comprising: An openable and closable test chamber (100), the inner cavity of the test chamber (100) being partitioned into a plurality of circumferentially arranged and mutually independent test cavities, and the test chamber (100) being connected with an oil injection pipe (160), an oil discharge pipe (170), and an exhaust pipe (180) that communicate with each of the test cavities; An electrode assembly (200), the electrode assembly (200) being disposed in the test chamber (100) corresponding to each test cavity one by one, the electrode assembly (200) including a high-voltage electrode (210) and a ground electrode (220), the first ends of the high-voltage electrode (210) and the ground electrode (220) being adjustably spaced from each other in the test cavity to serve as a clamping structure for clamping a sample to be tested, the second end of the ground electrode (220) passing out of the test chamber (100) to be connected to a ground wire, and the second end of the high-voltage electrode (210) passing out of the test chamber (100) to serve as a power receiving end; A switching assembly (300) for electrically connecting an impulse generator, the switching assembly (300) having a power supply end (330) adapted to the power receiving end, and the power supply end (330) being able to rotate about the axis of the test chamber (100) to alternately electrically connect with the power receiving ends of the high-voltage electrodes (210).

2. The insulation strength testing device according to claim 1, characterized in that, The insulation strength testing device includes a plurality of the test chambers (100), and the test chambers (100) are arranged coaxially and spaced apart vertically, and the switching assembly (300) includes a plurality of the power supply ends (330) corresponding to the test chambers (100) one by one.

3. The insulation strength testing device according to claim 2, wherein, The oil injection pipe (160) of the test chamber (100) located in the lower layer communicates with the oil discharge pipe (170) of the test chamber (100) located in the upper layer.

4. The insulation strength testing device according to claim 2, wherein The electrode assemblies (200) are circumferentially uniformly distributed along the test chamber (100), and along the up-and-down direction, the electrode assemblies (200) of the test chambers (100) are sequentially deflected by a preset angle circumferentially, and the preset angle is not equal to the circumferential angle between two adjacent high-voltage electrodes (210) on the same test chamber (100), so that the electrode assemblies (200) of the test chambers (100) are sequentially arranged out of alignment circumferentially, and the included angle between the axes of two adjacent high-voltage electrodes (210) on the same test chamber (100) and the axis of the test chamber (100) is the circumferential angle between two adjacent high-voltage electrodes (210) on the same test chamber (100), and the power supply ends (330) of the switching assembly (300) are sequentially spaced apart along the axial direction of the test chamber (100).

5. The insulation strength testing device according to claim 2, characterized in that The electrode assemblies (200) are evenly distributed along the circumferential direction of the test chamber (100), and the projections of the electrode assemblies (200) of each test chamber (100) on the projection plane perpendicular to the axial direction of the test chamber (100) coincide. Each power supply terminal (330) of the switching assembly (300) is deflected by a preset angle in the circumferential direction in sequence from top to bottom, so that each power supply terminal (330) is arranged in a circumferentially staggered manner. The preset angle is not equal to the circumferential angle between two adjacent high-voltage electrodes (210) on the same test chamber (100). The included angle between the connecting lines of the axes of two adjacent high-voltage electrodes (210) on the same test chamber (100) and the axis of the test chamber (100) is the circumferential angle between two adjacent high-voltage electrodes (210) on the same test chamber (100).

6. The insulation strength testing device according to claim 3 or 4, characterized in that The test chamber (100) includes a circumferential outer wall (110), a circumferential inner wall (120), a chamber bottom (130) and a chamber cover (140). The circumferential outer wall (110) and the circumferential inner wall (120) are coaxially sleeved outside the circumferential inner wall (120). The chamber bottom (130) is hermetically connected to the circumferential outer wall (110) and the circumferential inner wall (120) at their bottoms respectively. The chamber cover (140) is hermetically and detachably connected to the circumferential outer wall (110) and the circumferential inner wall (120) at their tops respectively. The circumferential outer wall (110), the circumferential inner wall (120), the chamber bottom (130) and the chamber cover (140) enclose the inner cavity of the test chamber (100).

7. The insulation strength testing device according to claim 6, wherein Each test chamber (100) is coaxially connected up and down through a connecting cylinder (500). The circumferential inner wall (120) of the test chamber (100) is sleeved outside the connecting cylinder (500).

8. The insulation strength testing device according to claim 7, characterized in that, The high-voltage electrode (210) and the grounding electrode (220) in the same electrode assembly (200) are coaxially arranged. At least one of the high-voltage electrode (210) and the grounding electrode (220) is threadedly engaged with the test chamber (100), and / or at least one of the high-voltage electrode (210) and the grounding electrode (220) includes an electrode body and a feeding member. One end of the electrode body is fixed to the test chamber (100), and the other end is threadedly engaged with the feeding member.

9. The insulation strength testing device according to claim 8, wherein, The circumferential outer bulkhead (110) is provided with a first electrode base (600) protruding radially from the wall surface of the circumferential outer bulkhead (110) along the test chamber (100). The circumferential inner bulkhead (120) and / or the connecting cylinder (500) is provided with a second electrode base (700) protruding radially from the wall surface of the circumferential inner bulkhead (120) or the connecting cylinder (500) along the test chamber (100). One of the high-voltage electrode (210) and the ground electrode (220) in the same electrode assembly (200) penetrates through the first electrode base (600) and extends into the test cavity, and the other penetrates through the second electrode base (700) and extends into the test cavity.

10. The insulation strength testing device according to claim 7, characterized in that, The switching assembly (300) further includes an indexing drive device for driving each of the power supply terminals (330) to intermittently rotate at a preset angle.

11. The insulation strength testing device according to claim 10, wherein The indexing drive device includes a drive base (310) and a transmission rod (320). The transmission rod (320) is in transmission cooperation with the drive base (310). The transmission rod (320) is coaxially arranged in the connecting cylinder (500). Each of the power supply terminals (330) is arranged at intervals along the axial direction of the transmission rod (320). The transmission rod (320) is used for electrically connecting the impact generator.

12. The insulation strength testing device according to claim 11, characterized in that, The transmission rod (320) is connected with an insulating handle (340) for manually driving the transmission rod (320) to rotate.

13. The insulation strength testing device according to claim 6, characterized in that, A plurality of partitions (150) are arranged at intervals along the circumference in the inner cavity. Each of the partitions (150) divides the inner cavity into a plurality of test cavities arranged along the circumference. A plurality of mounting members are respectively arranged at intervals along the circumference on the opposite wall surfaces of the circumferential outer bulkhead (110) and the circumferential inner bulkhead (120). The mounting members are provided with mounting grooves extending along the axial direction of the test chamber (100). The two side edges of the partition (150) are respectively in sliding cooperation with the mounting grooves on the circumferential outer bulkhead (110) and the circumferential inner bulkhead (120) to detachably arrange the partition (150) in the test chamber (100).

14. The insulation strength testing device according to any one of claims 1-5, characterized in that, The test chamber (100) is provided with an annular ground wire (400) corresponding to the position where the ground electrode (220) penetrates out of the test chamber (100). The annular ground wire (400) is electrically connected to each of the ground electrodes (220).

15. The insulation strength testing device according to any one of claims 1-5, characterized in that, One of the power supply terminal (330) and the power receiving terminal is provided with a U-shaped opening member (350). The opening of the U-shaped opening member (350) faces the other of the power supply terminal (330) and the power receiving terminal. The U-shaped opening member (350) has two opposite conductive arms for respectively contacting and cooperating with the other of the power supply terminal (330) and the power receiving terminal from both sides.

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