Pressure test tooling

Abstract

The present application discloses a withstand voltage test tool, which relates to the field of detection equipment. The withstand voltage test tool includes an insulating cylinder, a transformer, a voltage doubler rectifier, a voltage divider and a sampling device. A sealed accommodating chamber is formed in the insulating cylinder, and the accommodating chamber is filled with insulating liquid. The transformer, the voltage doubler rectifier, the voltage divider and the sampling device are all arranged in the accommodating chamber. The primary side of the transformer is used to connect to an external power supply. The voltage doubler rectifier is connected to the secondary side of the transformer and is arranged near the center of the insulating cylinder; the voltage divider and the voltage doubler rectifier are arranged separately, and the voltage divider is connected to the high-voltage end of the voltage doubler rectifier. The sampling device is connected to the voltage divider and is arranged near the low-voltage end of the voltage doubler rectifier to collect the electrical signal at the output end of the voltage divider. The withstand voltage test tool realizes voltage boosting through the transformer and the voltage doubler rectifier, and realizes measurement of the electrical signal of the withstand voltage test tool through the voltage divider and the sampling device.

Description

Technical Field

[0001] The present application generally relates to the technical field of detection equipment, and more specifically to a pressure resistance test tool. Background Art

[0002] In the field of high-voltage electrical equipment manufacturing, high-voltage isolation transformers are key components, and their withstand voltage performance is directly related to the safe and stable operation of the entire electrical system. Especially in high-voltage power transmission, power distribution, and special industrial applications, high-voltage isolation transformers need to withstand extremely high voltage stress. Therefore, strict testing of their withstand voltage performance is an indispensable part of ensuring product quality and stable performance.

[0003] Traditional withstand voltage test equipment often faces many challenges when facing high-voltage isolation transformers. On the one hand, as the withstand voltage level of the transformer increases, such as reaching a high voltage level of 300KV, the test equipment needs to have a higher voltage output capability and more precise control accuracy to ensure the accuracy and reliability of the test results. On the other hand, safety protection, ease of operation and test efficiency during the high-voltage test are also important factors that cannot be ignored.

[0004] Therefore, it is necessary to provide a pressure test tool to at least partially solve the above problems. Summary of the invention

[0005] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further described in detail in the Detailed Description of the Invention section. The Summary of the Invention section of this application does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0006] In order to at least partially solve the above problems, the present application provides a withstand voltage test tool, which includes:

[0007] An insulating cylinder, wherein a sealed accommodating cavity is formed in the insulating cylinder and the accommodating cavity is filled with insulating liquid;

[0008] A transformer, the transformer being disposed in the accommodating cavity, the primary side of the transformer being used to be connected to an external power source;

[0009] A voltage doubler rectifier device, the voltage doubler rectifier device is arranged in the accommodating cavity and close to the center of the insulating cylinder, and the voltage doubler rectifier device is connected to the secondary side of the transformer;

[0010] A voltage dividing device, wherein the voltage dividing device and the voltage doubling and rectifying device are arranged in the accommodating cavity at a distance, and the voltage dividing device is connected to the high-voltage end of the voltage doubling and rectifying device; and

[0011] A sampling device is arranged in the accommodating cavity and connected to the voltage divider device, and the sampling device is arranged close to the low-voltage end of the voltage doubler rectifier device to collect the electrical signal at the output end of the voltage divider device.

[0012] According to this scheme, the withstand voltage test fixture achieves voltage boosting through a transformer and a voltage doubling rectifier device to ensure that high voltage is output to test the equipment under test, and a voltage divider device and a sampling device are set between its high voltage end and low voltage end to achieve accurate measurement of the electrical signal of the withstand voltage test fixture.

[0013] Optionally, the voltage divider device includes multiple voltage divider plates, each of which is provided with a voltage divider circuit. The multiple voltage divider plates are distributed at a set insulation distance in the height direction of the insulating cylinder and are connected in series in sequence. The voltage divider plate close to the bottom of the insulating cylinder is connected to the low-voltage end of the voltage doubler rectifier device.

[0014] According to this solution, a structure in which multiple voltage divider plates are connected in series and separated by a set insulating distance in the height direction can effectively prevent electrical short circuits in high-voltage environments, thereby improving the insulation and safety performance of the voltage withstand test tooling; and the voltage divider device is designed as multiple voltage divider plates connected in series, which can reduce the volume of the entire test tooling.

[0015] Optionally, the pressure dividing plates are in the shape of spiral plates, and the pressure dividing plates are sequentially connected end to end to form a spiral ascending structure; or

[0016] The voltage dividing plate is constructed as an annular plate with a notch, the notches of two adjacent voltage dividing plates are aligned, and the voltage dividing plates are connected end to end in sequence through a wire to form a spiral ascending structure.

[0017] According to this solution, the voltage divider device forms a spiral ascending structure, which can optimize the electric field distribution in the insulating cylinder, reduce the possibility of local discharge, and further improve the stability and safety of the withstand voltage test tooling.

[0018] Optionally, the pressure dividing device further comprises a first support rod extending in the height direction;

[0019] The pressure dividing plate is detachably mounted to the first support rod; or each of the pressure dividing plates and the first support rod is constructed as an integrally formed pressure dividing component, and two adjacent pressure dividing components are plugged and matched through their respective first support rods to form the pressure dividing device.

[0020] According to this solution, the voltage divider device has high mechanical strength and stability, is very convenient to disassemble and assemble, and the number of voltage divider plates can be adjusted according to actual usage requirements.

[0021] Optionally, the withstand voltage test fixture further comprises an ignition current limiting device connected to the high-voltage end, the ignition current limiting device is installed on the top of the pressure dividing device, and the ignition current limiting device comprises:

[0022] a second support rod connected to the voltage dividing device and extending in a height direction of the insulating cylinder; and

[0023] A current limiting plate, on which a current limiting circuit is arranged, and a plurality of the current limiting plates are installed to the second support rod at intervals along the height direction.

[0024] According to this solution, the safety of the internal circuit of the voltage withstand test tooling can be guaranteed, ensuring its safe and stable operation, and by installing the ignition current limiting device on the top of the voltage divider device, the overall size of the test tooling can be further controlled, thereby improving the space utilization of the accommodating cavity.

[0025] Optionally, the sampling device comprises:

[0026] a first sampling device, wherein the first sampling device and the voltage dividing device are connected in series between the high voltage end and the low voltage end of the voltage doubling rectifier device to form a voltage dividing sampling loop, and the first sampling device is arranged close to the low voltage end of the voltage doubling rectifier device to collect a voltage signal of the voltage dividing sampling loop; and

[0027] A second sampling device is provided in the general loop close to the low voltage end of the voltage doubler rectifier device, and is used for collecting the current signal of the general loop.

[0028] According to this solution, the output voltage of the test fixture can be detected by the first sampling device, and the current of the total loop can be detected by the second sampling device.

[0029] Optionally, the wall of the insulating cylinder is embedded with a wiring terminal, including:

[0030] a first terminal connected to the primary side of the transformer and used to be connected to the external power source; and

[0031] A second wiring terminal is connected to the sampling device and is used to connect to a detection device to collect the output voltage and load current of the withstand voltage test fixture.

[0032] According to this solution, by embedding the wiring terminal on the insulating cylinder, it is convenient to connect the detection equipment outside the insulating cylinder to realize the detection of the output parameters of the test tooling.

[0033] Optionally, the voltage doubler and rectifier device comprises:

[0034] A third support rod, the third support rod extending along the height direction of the insulating cylinder and disposed in the accommodating cavity; and

[0035] A voltage doubler rectifier plate, a plurality of the voltage doubler rectifier plates are connected to the third support rod at predetermined intervals along the height direction;

[0036] Wherein, a voltage doubling rectifier circuit is arranged on each of the voltage doubling rectifier boards, and a plurality of the voltage doubling rectifier boards are connected in sequence along the height direction, and the voltage doubling rectifier board at the bottom is connected to the secondary side of the transformer.

[0037] According to this solution, the voltage doubler rectifier device is designed to have multiple voltage doubler rectifier plates connected in sequence and stacked at intervals along the height direction inside the insulating cylinder, which can reduce the volume of the entire test fixture.

[0038] Optionally, the insulating cylinder includes a cover plate, to which a high-voltage lead-out terminal is connected, and the high-voltage lead-out terminal includes:

[0039] A terminal connected to the high voltage end;

[0040] an insulating base column, the insulating base column being wrapped around the outer side of the terminal; and

[0041] An insulating substrate is integrally connected to the bottom of the insulating base column and is detachably connected to the cover plate.

[0042] According to this solution, the high-voltage lead-out terminal is easy to install and replace, and its size can be adjusted according to actual needs.

[0043] Optionally, an insulating arch is provided on the outer surface of the insulating base column; and / or

[0044] At least one of the outer surface of the insulating substrate and the inner surface of the insulating substrate is provided with an insulating sleeve, and the insulating sleeve is provided outside the insulating base column. According to this solution, the creepage distance can be further increased by the insulating arch and the insulating sleeve, thereby ensuring the insulation effect of the test tooling and having higher safety.

[0045] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures indicated in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The following drawings of the embodiments of the present invention are used as part of the present invention for understanding the present invention. The embodiments of the present invention and their description are shown in the drawings to explain the principles of the present invention. In the drawings,

[0047] Figure 1 It is a three-dimensional structural schematic diagram of a withstand voltage test tool according to a preferred embodiment of the present application, in which a part of the insulating cylinder is hidden;

[0048] Figure 2 for Figure 1 Another three-dimensional structural diagram of the medium-voltage test fixture;

[0049] Figure 3 for Figure 1 Schematic diagram of the structure of medium and high voltage lead-out terminals;

[0050] Figure 4 for Figure 3 A schematic diagram of an installation structure of medium and high voltage lead-out terminals and insulating cylinders;

[0051] Figure 5 for Figure 4 A top view of the medium-voltage test fixture, with the cover and high-voltage lead terminals hidden;

[0052] Figure 6 Shows Figure 1 A schematic diagram of the three-dimensional structure of the medium pressure dividing device;

[0053] Figure 7 Shows Figure 6 Schematic diagram of the three-dimensional structure of the middle pressure plate;

[0054] Figure 8 Shows Figure 1 A schematic diagram of the three-dimensional structure of the ignition current limiting device; the electrical components on the current limiting plate are hidden; and

[0055] Fig. 9 A simplified circuit structure schematic diagram of a withstand voltage test tool according to a preferred embodiment of the present application is shown.

[0056] Description of reference numerals:

[0057] 100, test tool; 110, insulating cylinder; 111, cover plate; 112, base; 113, cylinder wall; 114, mounting flange; 115, accommodating chamber; 120, transformer; 121, first wiring terminal; 130, voltage divider; 131, voltage divider plate; 132, notch; 133, first support rod; 140, sampling device; 141, first sampling device; 142, second sampling device; 143, second wiring terminal; 143a, voltage sampling terminal; 143b, Current sampling terminal; 143c, output low voltage terminal; 150, ignition current limiting device; 151, current limiting plate; 152, second support rod; 160, voltage doubling rectifier device; 161, voltage doubling rectifier plate; 162, third support rod; 170, high voltage lead-out terminal; 171, terminal post; 172, insulating base column; 173, raised disk; 174, first insulating sleeve; 175, second insulating sleeve; 176, insulating substrate; 181, protective cover; 182, moving device; D, height direction. DETAILED DESCRIPTION

[0058] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present application. However, it is obvious to those skilled in the art that the present application embodiments can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application embodiments, some technical features well known in the art are not described.

[0059] In order to thoroughly understand the implementation of the present application, a detailed structure will be presented in the following description. Obviously, the implementation of the implementation of the present application is not limited to the specific details familiar to those skilled in the art. The preferred implementation of the present application is described in detail below, but in addition to these detailed descriptions, the present application may also have other implementations and should not be interpreted as being limited to the implementations presented here.

[0060] It should be understood that the purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present application, and the singular forms of "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. When the terms "comprise" and / or "include" are used in this specification, they indicate the presence of the features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof. The terms "upper", "lower", "front", "back", "left", "right" and similar expressions used in this application are for illustrative purposes only and are not limiting.

[0061] Ordinal numbers such as “first” and “second” cited in the present application are merely identifications and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term “first component” itself does not imply the existence of the “second component”, and the term “second component” itself does not imply the existence of the “first component”.

[0062] In this document, “equal”, “same”, etc. are not strictly limited in mathematical and / or geometric senses, but also include errors that can be understood by those skilled in the art and allowed by manufacturing or use.

[0063] Unless otherwise stated, the numerical ranges herein include not only the entire range within its two endpoints but also include several sub-ranges contained therein.

[0064] Below, we will refer to the attached Figures 1 to 9 The specific embodiments of the present application are described in more detail. These drawings show representative embodiments of the present application and do not limit the present application.

[0065] A withstand voltage test tool 100 according to an embodiment of the present application includes an insulating cylinder 110, a transformer 120, a voltage doubler rectifier 160, a voltage divider 130 and a sampling device 140. A sealed accommodating chamber 115 is formed in the insulating cylinder 110, and the accommodating chamber 115 is filled with an insulating liquid. The transformer 120, the voltage doubler rectifier 160, the voltage divider 130 and the sampling device 140 are all arranged in the accommodating chamber 115 and immersed in the insulating liquid. Exemplarily, the insulating liquid can be transformer oil.

[0066] The primary side of the transformer 120 is used to connect to an external power supply, and the secondary side of the transformer 120 is used to connect to a voltage doubling rectifier 160. The transformer 120 is used to boost the voltage of the external power supply. The transformer 120 can also play a role in electrical isolation. It can be understood that the structure of the withstand voltage test fixture 100 of the present application itself includes a transformer 120. The output end of the withstand voltage test fixture 100 of the present application is used to connect to the device under test to implement a withstand voltage test on the device under test. The device under test can be a produced transformer.

[0067] The voltage doubler rectifier 160 is arranged in the accommodating cavity 115 and close to the center of the insulating cylinder 110. The voltage doubler rectifier 160 is connected to the secondary side of the transformer 120 and further boosts the output voltage of the transformer 120 so that the output voltage reaches the expected value, so that the voltage withstand test can be performed on the equipment under test.

[0068] The voltage divider 130 and the voltage doubler rectifier 160 are arranged in the accommodating chamber 115 at intervals, and the sampling device 140 is connected to the voltage divider 130. The sampling device 140 is arranged near the low voltage end of the voltage doubler rectifier 160 to collect the electrical signal at the output end of the voltage divider 130. The voltage divider 130 is connected to the high voltage end of the voltage doubler rectifier 160.

[0069] See also Figures 1 to 4 The insulating cylinder 110 includes a cover plate 111, a base 112, a cylinder wall 113 and a mounting flange 114. The cylinder wall 113 is roughly cylindrical, and the cover plate 111 is sealed to the top of the cylinder wall 113 through the mounting flange 114, and the base 112 is sealed to the bottom of the cylinder wall 113 through the mounting flange 114. A mounting hole is provided in the middle of the cover plate 111 for mounting a high-voltage lead-out terminal 170 (refer to the following description). The cover plate 111, the base 112, the cylinder wall 113 and the mounting flange 114 are sealed and fixed by fasteners and seals, and form a sealed accommodating chamber 115, which can prevent the internal insulating liquid from leaking from the splicing position.

[0070] The insulating cylinder 110 is made of insulating material. It can be set to be transparent so that the working conditions of each device placed inside it can be observed in time. The base 112 can be directly placed at the installation position (such as Figure 1 and Figure 2 A mobile device 182 may also be installed at the bottom thereof. Figure 4 and Figure 5 In the illustrated embodiment, a moving device 182 is installed at the bottom of the base 112. The moving device 182 includes a plurality of lockable universal wheels so as to quickly move the entire test fixture 100 to a corresponding working area to carry out testing work.

[0071] and Figure 1 and Figure 2 compared to, Figure 4 The structure of the mounting flange 114 is omitted. Figure 1 , Figure 2 and Figure 4 It can be seen that the mounting flange 114 at the bottom of the pressure test fixture 100 is fixed to the base 112 and the cylinder wall 113 respectively by threaded fasteners; the mounting flange 114 at the fixed part of the pressure test fixture 100 is fixed to the cover plate 111 and the cylinder wall 113 respectively by threaded fasteners.

[0072] like Figure 1 , Figure 2 and Figure 4As shown in the figure, the connection method between the cylinder wall 113 of the insulating cylinder 110 and the mounting flange 114 is: a plurality of radial through holes are opened on the mounting flange 114 along the circumferential direction of the mounting flange 114, and at the same time, a plurality of threaded blind holes are correspondingly opened on the outer surface of the bottom (or top) of the cylinder wall 113 of the insulating cylinder 110, and then the insulating cylinder 110 is firmly mounted on the mounting flange 114 by means of the threaded cooperation between the screws and the threaded blind holes.

[0073] At this point, the base 112, the cover plate 111 and the two mounting flanges 114 cooperate to complete the encapsulation of both ends of the insulating cylinder 110, so that a sealed cavity is formed inside the insulating cylinder 110. The sealed cavity is filled with insulating liquid, and the remaining devices are immersed in the insulating liquid.

[0074] The insulating cylinder 110 of the test fixture 100 in this embodiment is in a high-voltage environment, which requires high voltage insulation performance to ensure safety in use. Therefore, transformer oil is selected as the insulating liquid, which can absorb the heat generated inside the test fixture 100 on the one hand, and improve the high insulation performance of the test fixture 100 on the other hand.

[0075] Preferably, the mounting flange 114 is made of insulating material. An annular groove may be provided in at least one of the upper surface of the base 112 and the lower surface of the mounting flange 114 for mounting a sealing ring. The barrel wall 113 of the insulating barrel 110 and the mounting flange 114 may also be sealed with each other through a sealing member to avoid leakage at the matching gap between the two.

[0076] The withstand voltage test fixture 100 achieves voltage boosting through the transformer 120 and the voltage doubler rectifier 160 to ensure that the high voltage is output to test the device under test. A voltage divider 130 and a sampling device 140 are set between the high voltage end and the low voltage end to achieve accurate measurement of the electrical signal of the withstand voltage test fixture 100.

[0077] Specifically, refer to Fig. 9 The sampling device 140 includes a first sampling device 141 and a second sampling device 142. The first sampling device 141 and the voltage divider device 130 are connected in series between the high voltage end and the low voltage end of the voltage doubler rectifier device 160) to form a voltage divider sampling loop. The first sampling device 141 is arranged close to the low voltage end of the voltage doubler rectifier device 160, and is used to collect the voltage signal of the voltage divider sampling loop. The output voltage of the test fixture 100 can be detected through the first sampling device 141. The second sampling device 142 is arranged in the total loop close to the low voltage end of the voltage doubler rectifier device 160. The current of the total loop can be detected through the second sampling device 142, so that the current value of the load loop can be obtained when the withstand voltage test is performed on the device to be tested.

[0078] refer to Figure 1 , Figure 2 , Figure 4 and Figure 5 The wall 113 of the insulating cylinder 110 is embedded with a wiring terminal, including a first wiring terminal 121 and a second wiring terminal 143. The first wiring terminal 121 is connected to the primary side of the transformer 120. An external power source is connected to the first wiring terminal 121 to power the withstand voltage test fixture 100. The output voltage of the withstand voltage test fixture 100 can be adjusted by adjusting the voltage of the external power source.

[0079] The second wiring terminal 143 is connected to the sampling device 140. The detection device is connected to the second wiring terminal 143 to collect the output voltage and load current of the withstand voltage test fixture 100. In this embodiment, the second wiring terminal 143 includes three terminals, namely, a voltage sampling terminal 143a, a current sampling terminal 143b and an output low voltage terminal 143c. Fig. 9 , the voltage detection device is connected to the voltage sampling terminal 143a and the output low voltage terminal 143c to realize voltage sampling, and the current detection device is connected to the current sampling terminal 143b and the output low voltage terminal 143c to realize current sampling. The cylinder wall 113 of the insulating cylinder 110 is also embedded with a shell grounding terminal, which is connected to each conductive component inside the insulating cylinder 110. The shell grounding terminal and the output low voltage terminal 143c are both grounded.

[0080] In the figure, the first wiring terminal 121 , the second wiring terminal 143 and the housing grounding terminal are sealed and arranged on the cylinder wall 113 near the base 112 .

[0081] It can be understood that the voltage divider device 130 is actually a voltage divider circuit, and the sampling device 140 is actually a sampling circuit. In this embodiment, in order to facilitate connection and installation and reduce the size of the device, the voltage divider circuit and the sampling circuit are integrated.

[0082] refer to Figure 1 , Figure 2 and Figure 5 The sealed cavity is provided with a transformer 120, a voltage doubling rectifier 160 and a voltage divider 130. The transformer 120, the voltage doubling rectifier 160 and the voltage divider 130 are fixed to the insulating cylinder 110 (part of the base 112) by fasteners respectively. Compared with the transformer 120, the voltage doubling rectifier 160 and the voltage divider 130 are arranged closer to the center of the sealed cavity, which can effectively improve safety.

[0083] See also Figure 1 , Figure 2 and Fig. 9The voltage doubler rectifier device 160 includes a third support rod 162 and a voltage doubler rectifier plate 161. The third support rod 162 is extended along the height direction D of the insulating cylinder 110 and is arranged in the accommodating cavity 115. A plurality of voltage doubler rectifier plates 161 are connected to the third support rod 162 at a predetermined distance along the height direction D. A voltage doubler rectifier circuit is arranged on each voltage doubler rectifier plate 161, and the plurality of voltage doubler rectifier plates 161 are connected in sequence along the height direction D, and the voltage doubler rectifier plate 161 at the bottom is connected to the secondary side of the transformer 120.

[0084] A certain space is left between adjacent voltage doubler rectifier plates 161, so that transformer oil can fully contact the surface of the voltage doubler rectifier plates 161, thereby effectively reducing its temperature and maintaining its stable operation. Each voltage doubler rectifier plate 161 is connected in series in sequence and stacked at intervals along the height direction D inside the insulating cylinder 110 to form the entire voltage doubler rectifier circuit, which can improve the space utilization of the sealed cavity while ensuring electrical safety.

[0085] In this embodiment, the bottom of the voltage doubler rectifier 160 is its low voltage end, and the top of the voltage doubler rectifier 160 is its high voltage end. The high voltage end of the voltage doubler rectifier 160 is finally connected to the high voltage lead-out terminal 170. The voltage doubler rectifier plate 161 can be integrally mounted to the third support rod 162, or can be detachably mounted to the third support rod 162.

[0086] refer to Figure 1 , Figure 2 and Figure 6 In this embodiment, the voltage dividing device 130 includes a plurality of voltage dividing plates 131, and a voltage dividing circuit is arranged on the voltage dividing plates 131. The plurality of voltage dividing plates 131 are distributed at a set insulation distance in the height direction D of the insulating cylinder 110. And the plurality of voltage dividing plates 131 are connected in series in sequence. It can be understood that the series connection refers to the partial series connection of the voltage dividing circuits on the plurality of voltage dividing plates 131.

[0087] The voltage divider plate 131 near the bottom of the insulating cylinder 110 is connected to the low voltage end of the voltage doubler rectifier 160. The structure in which multiple voltage divider plates 131 are spaced apart in the height direction D can effectively and evenly seal the electric field in the cavity, prevent electrical short circuits under high voltage environments, and improve the insulation performance and safety performance of the withstand voltage test fixture 100. The voltage divider device 130 is designed as multiple voltage divider plates 131 connected in series, and the volume occupancy of the entire test fixture 100 can be controlled by reducing the occupied area of ​​the voltage divider device 130.

[0088] In this embodiment, a sampling circuit is also provided on the voltage dividing plate 131 near the bottom of the insulating cylinder 110. In other words, the sampling device 140 and the voltage dividing device 130 are integrated. The voltage dividing device 130 is connected to the low voltage end of the voltage doubling rectifier device 160 through the sampling device 140, and the second terminal 143 is also connected to the sampling device 140. The sampling circuit is set on the voltage dividing plate 131 at the bottom of the voltage dividing device 130, the bottom of the voltage dividing device 130 is connected to the low voltage end of the bottom of the voltage doubling rectifier device 160, and the top of the voltage dividing device 130 is connected to the high voltage end of the voltage doubling rectifier device 160. This design can make the wiring between the various devices in the sealed cavity more concise and reasonable, and is also convenient for installation.

[0089] Preferably, the voltage divider 130 is constructed as a spiral ascending structure, which can further optimize the electric field distribution in the insulating cylinder 110. Exemplarily, each voltage divider plate 131 can be constructed as a spiral plate. The voltage divider 130 can be formed by connecting the voltage divider plates 131 end to end in sequence.

[0090] See also Figure 6 and Figure 7 In this embodiment, the pressure dividing plate 131 is constructed as an annular plate with a notch 132. Figure 7 In the embodiment, the voltage dividing plate 131 is an annular flat plate, and a notch 132 is designed in the circumferential direction thereof. The voltage dividing plate 131 is provided with a voltage dividing circuit. Figure 7 The components in the voltage divider circuit are shown in a simple diagram. Fig. 9 It can be seen that the voltage divider circuit is designed in series, so during the operation of the withstand voltage test fixture 100, there is a potential difference on both sides of the notch 132 of the voltage divider plate 131, and a better insulation effect can be achieved through the design of the notch 132. The design of the center hole of the annular voltage divider plate 131 can improve the insulation effect on the one hand, and on the other hand, when the insulating liquid flows in the sealed cavity, it can reduce the obstruction to the insulating liquid and further even the electric field in the sealed cavity.

[0091] Figure 6 In the embodiment, the notches 132 of two adjacent voltage-dividing plates 131 are aligned, and the voltage-dividing plates 131 are sequentially connected end to end through wires (not shown) to form a spiral ascending structure.

[0092] The voltage dividing device 130 further includes a first support rod 133 extending in the height direction D and configured to support the voltage dividing plate 131 . Figure 6In the embodiment, there are a plurality of first support rods 133, and the plurality of first support rods 133 are spaced apart and arranged around the central axis of the pressure dividing plate 131. In one example, the first support rod 133 is connected to the base 112, and the pressure dividing plate 131 is detachably mounted to the first support rod 133. In the second example, each pressure dividing plate 131 and the first support rod 133 are connected to form a pressure dividing component, and two adjacent pressure dividing components are plugged and matched through their respective first support rods 133 to form a pressure dividing device 130; wherein, the pressure dividing plate 131 of the pressure dividing component can be integrally connected to the first support rod 133 or detachably connected. In the third example, each pressure dividing plate 131 can also be integrally fixedly mounted to the first support rod 133.

[0093] See also Figure 6 Each of the pressure dividing plates 131 is in the shape of an annular flat plate, and the number of turns of the spiral is less than one circle, forming a circular ring plate with an opening.

[0094] In one example, five socket holes are provided on the plate surface of each voltage-dividing plate 131 for socketing on the first support rod 133. Each voltage-dividing plate 131 can be plugged and matched with each first support rod 133 through the socket holes to achieve installation on the first support rod 133. At the same time, a limiter can be set between adjacent voltage-dividing plates 131 to limit the adjacent voltage-dividing plates 131 to a set insulation distance from each other. For example, a positioning hole can be set on each first support rod 133, and the positioning of the voltage-dividing plate 131 can be achieved by the cooperation of the positioning hole and the positioning pin as a limiter.

[0095] It can be understood that the advantage of the detachable connection between the pressure dividing plate 131 and the first support rod 133 is that it is convenient to disassemble and assemble, and the number of the pressure dividing plates 131 can be adjusted according to actual use requirements. When the pressure dividing plate 131 and the first support rod 133 are connected in one piece, the structural stability of the pressure dividing device 130 is higher.

[0096] like Fig. 9 As shown in the schematic diagram of the principle, the withstand voltage test fixture 100 also includes a spark current limiting device 150 connected to the high voltage end of the voltage doubler rectifier 160. The spark current limiting device 150 can stabilize the current in the circuit, reduce the interference and fluctuation caused by the spark, and ensure that the system can work continuously and stably.

[0097] See also Figure 1 , Figure 2 and Figure 8The spark current limiting device 150 is installed on the top of the voltage dividing device 130. Its structure is also a spiral rise similar to the structure of the voltage dividing device 130. It can not only play a role in uniformly sealing the electric field in the cavity, but also make full use of the space in the cavity: the input end of the spark current limiting device 150 is connected to the top of the voltage dividing device 130 below (which is also the high-voltage end of the voltage doubling rectifier device 160). The output end of the spark current limiting device 150 is located at its own top for connection with the terminal 171 of the high-voltage lead-out terminal 170. Fig. 9 The terminal 171 is the output high voltage terminal of the withstand voltage test fixture 100. Through the spiral ascending structure of the ignition current limiting device 150, the output end of the ignition current limiting device 150 is close to the high voltage lead-out terminal 170 installed on the cover plate 111, avoiding complex wiring and ensuring electrical safety.

[0098] The ignition current limiting device 150 includes a second support rod 152 and a current limiting plate 151, and the second support rod 152 extends along the height direction D of the insulating cylinder 110. A current limiting circuit is provided on the current limiting plate 151, and a plurality of current limiting plates 151 are installed to the second support rod 152 at intervals along the height direction D. Exemplarily, the second support rod 152 is connected to the voltage dividing plate 131 or the first support rod 133 at the top of the voltage dividing device 130; or the first support rod 133 is connected to the current limiting plate 151 at the bottom of the ignition current limiting device 150, and both can realize the installation and fixation of the ignition current limiting device 150 and the voltage dividing device 130. The current limiting plate 151 is constructed as an annular flat plate with a notch 132, and two adjacent current limiting plates 151 can be connected by wires.

[0099] The first support rod 133, the second support rod 152, the third support rod 162, the voltage divider plate 131, the current limiting plate 151 and the voltage doubler rectifier plate 161 are all made of insulating materials. Among them, the ignition current limiting device 150 is set above the voltage divider device 130, so that the connection and coordination between the various structures in the test fixture 100 are more reasonable, the circuit is simple to avoid complex winding, and the tower structure formed by the combination of the voltage divider device 130 and the ignition current limiting device 150 is used to optimize the electric field distribution in the insulating cylinder 110, reduce the possibility of local discharge, improve insulation performance, reduce the overall volume of the test fixture 100, and further improve the stability and safety of the test fixture 100.

[0100] See also Figures 1 to 4 The cover plate 111 is connected to a high voltage lead terminal 170, which includes a terminal post 171, an insulating base post 172 and an insulating substrate 176. The terminal post 171 is connected to the high voltage end of the voltage doubler rectifier 160. Fig. 9 The high voltage end of the voltage doubler rectifier device 160 is connected to the high voltage lead terminal 170 through the spark current limiting device 150 .

[0101] See also Figure 3 , the insulating base column 172 is wrapped around the outside of the terminal 171. The insulating substrate 176 is integrally connected to the bottom of the insulating base column 172. The insulating substrate 176 is detachably connected to the cover plate 111. Exemplarily, the insulating substrate 176 is closely attached to the top surface of the cover plate 111 and is fixedly mounted to the cover plate 111 by threaded fasteners. The cross-sectional area of ​​the insulating substrate 176 is larger than the cross-sectional area of ​​the insulating base column 172, ensuring that the high-voltage lead terminal 170 is stably supported on the cover plate 111.

[0102] Preferably, the high voltage lead terminal 170 can be molded by injection molding with a mold and epoxy resin.

[0103] In this embodiment, the outer surface of the insulating column 172 is provided with an insulating bulge, thereby increasing the high voltage creepage distance. Specifically, a plurality of raised disks 173 are provided at intervals along the extending direction of the insulating column 172, and the outer surface of the insulating column 172 is radially arched outward to form a raised disk 173 structure.

[0104] In addition, an insulating sleeve is provided on the outer surface of the insulating substrate 176 and the inner surface of the insulating substrate 176. The insulating sleeve is configured as a cylinder sleeved on the outer side of the insulating base column 172. Figure 3 and Figure 4 On the outer surface of the insulating substrate 176, three first insulating sleeves 174 are coaxially arranged outside the insulating base column 172. On the inner surface of the insulating substrate 176, three second insulating sleeves 175 are arranged. This can increase the creepage distance at the high-voltage connection and improve the safety of the entire test fixture 100.

[0105] In this embodiment, a mounting hole is provided at the center of the cover plate 111, and the second insulating sleeve 175 on the inner surface of the insulating substrate 176 is just inserted into the mounting hole (refer to Figure 4 ), realize the installation and positioning of the high-voltage lead-out terminal 170, improve the stability of the connection position between the cover plate 111 and the high-voltage lead-out terminal 170, and further ensure the sealing performance of the sealing cavity.

[0106] Figure 4 In the illustrated embodiment, a protective cover 181 is further provided on the top of the high voltage lead-out terminal 170 to connect and protect the terminal 171 and facilitate the connection between the device under test and the terminal 171 .

[0107] The transformer 120, the voltage doubler rectifier 160, the voltage divider 130, the sampling device 140 and the spark current limiting device 150 are sequentially installed in the insulating cylinder 110, and Fig. 9After the connection is completed, the output end of the ignition current limiting device 150 is connected to the terminal 171. The terminal of the primary coil of the transformer 120 and the terminal of the sampling device 140 are connected to the corresponding terminal on the cylinder wall 113 of the insulating cylinder 110.

[0108] The voltage divider 131, the voltage doubler rectifier 161 and the current limiter 151 are actually in the form of printed circuit boards, such as Fig. 9 The functional parts of the circuit shown are correspondingly arranged on the voltage divider plate 131, the voltage doubler rectifier plate 161 and the current limiter plate 151. Fig. 9 The voltage doubler rectifier circuit includes a plurality of diodes and capacitors. The voltage divider circuit includes a plurality of resistors and capacitors. The first sampling device 141 includes three resistors, two of which are connected in series and in parallel with the third resistor to form a first sampling circuit. The second sampling device 142 includes a resistor, two capacitors and a bidirectional thyristor, and the resistor, capacitor and bidirectional thyristor are connected to each other in parallel to form a second sampling circuit.

[0109] The process of performing pressure test on the device under test using the pressure test tool 100 of the present application is as follows:

[0110] No-load state: The voltage withstand test fixture 100 is not connected to the device under test, but is only connected to an external power supply. The voltage detection device is connected to the voltage sampling terminal 143a and the output low-voltage terminal 143c, and the external power supply voltage is adjusted to gradually increase. The no-load output voltage value of the voltage withstand test fixture 100 is detected and calculated through the detection data of the voltage detection device, the step-up ratio of the transformer and the step-up multiple of the voltage doubler rectifier device, to ensure that the voltage withstand test fixture 100 can output the target detection voltage.

[0111] Load state: The withstand voltage test fixture 100 is connected to an external power supply, and the high-voltage lead-out terminal 170 (connecting post 171) is connected to the device under test. The current detection device is connected to the current sampling terminal 143b and the output low-voltage terminal 143c. The external power supply voltage is adjusted to gradually increase, and the current data at different detection voltages are counted.

[0112] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art in the technical field of this application. The terms used herein are only for describing specific implementation purposes and are not intended to limit this application. Terms such as "setting" appearing in this article can mean that one component is directly attached to another component, or that one component is attached to another component through an intermediate. Features described in this article in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in the other embodiment or otherwise specified.

[0113] The present application has been described through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and description, and are not intended to limit the present application to the described embodiments. It can be understood by those skilled in the art that more variations and modifications can be made according to the teachings of the present application, and these variations and modifications all fall within the scope of protection claimed in the present application.

Claims

1. A pressure test tool, characterized in that: The pressure test tooling comprises: An insulating cylinder, wherein a sealed accommodating cavity is formed in the insulating cylinder and the accommodating cavity is filled with insulating liquid; A transformer, the transformer being disposed in the accommodating cavity, the primary side of the transformer being used to be connected to an external power source; A voltage doubler rectifier device, the voltage doubler rectifier device is arranged in the accommodating cavity and close to the center of the insulating cylinder, and the voltage doubler rectifier device is connected to the secondary side of the transformer; A voltage dividing device, wherein the voltage dividing device and the voltage doubling and rectifying device are arranged in the accommodating cavity at a distance, and the voltage dividing device is connected to the high-voltage end of the voltage doubling and rectifying device; and A sampling device, which is arranged in the accommodating cavity and connected to the voltage divider, and is arranged close to the low-voltage end of the voltage doubler rectifier to collect the electrical signal at the output end of the voltage divider; The voltage divider device comprises a plurality of voltage divider plates, on which voltage divider circuits are arranged, and the plurality of voltage divider plates are distributed at a set insulation distance in the height direction of the insulating cylinder and are sequentially connected in series, and the voltage divider plate close to the bottom of the insulating cylinder is connected to the low voltage end of the voltage doubler rectifying device; The voltage divider plate is in the shape of a spiral plate, and each of the voltage divider plates is connected end to end in sequence to form a spiral ascending structure; or the voltage divider plate is constructed as a ring plate with a notch, the notches of two adjacent voltage divider plates are aligned, and each of the voltage divider plates is connected end to end in sequence through a wire to form a spiral ascending structure.

2. The withstand voltage test tool according to claim 1, characterized in that: The pressure dividing device further comprises a first support rod extending in the height direction; The pressure dividing plate is detachably mounted to the first support rod; or each of the pressure dividing plates and the first support rod is constructed as an integrally formed pressure dividing component, and two adjacent pressure dividing components are plugged and matched through their respective first support rods to form the pressure dividing device.

3. The withstand voltage test tool according to claim 1, characterized in that: The withstand voltage test fixture further includes an ignition current limiting device connected to the high-voltage end, the ignition current limiting device is installed on the top of the pressure dividing device, and the ignition current limiting device includes: a second support rod connected to the voltage dividing device and extending along a height direction of the insulating cylinder; and A current limiting plate, on which a current limiting circuit is arranged, and a plurality of the current limiting plates are installed to the second support rod at intervals along the height direction.

4. The withstand voltage test tool according to claim 1, characterized in that: The sampling device comprises: a first sampling device, wherein the first sampling device and the voltage dividing device are connected in series between the high voltage end and the low voltage end of the voltage doubling rectifier device to form a voltage dividing sampling loop, and the first sampling device is arranged close to the low voltage end of the voltage doubling rectifier device to collect a voltage signal of the voltage dividing sampling loop; and A second sampling device is provided in the general loop close to the low voltage end of the voltage doubler rectifier device, and is used for collecting the current signal of the general loop.

5. The withstand voltage test tool according to claim 1, characterized in that: The wall of the insulating cylinder is embedded with a wiring terminal, including: a first terminal connected to the primary side of the transformer and used to connect to the external power source; and A second wiring terminal is connected to the sampling device and is used to connect to a detection device to collect the output voltage and load current of the withstand voltage test fixture.

6. The withstand voltage test tool according to any one of claims 1 to 5, characterized in that: The voltage doubler and rectifier device comprises: A third support rod, the third support rod extending along the height direction of the insulating cylinder and disposed in the accommodating cavity; and A voltage doubler rectifier plate, a plurality of the voltage doubler rectifier plates are connected to the third support rod at predetermined intervals along the height direction; Wherein, a voltage doubling rectifier circuit is arranged on each of the voltage doubling rectifier boards, and a plurality of the voltage doubling rectifier boards are connected in sequence along the height direction, and the voltage doubling rectifier board at the bottom is connected to the secondary side of the transformer.

7. The withstand voltage test tool according to claim 1, characterized in that: The insulating cylinder includes a cover plate, and a high-voltage lead terminal is connected to the cover plate. The high-voltage lead terminal includes: A terminal connected to the high voltage end; an insulating base column, the insulating base column being wrapped around the outer side of the terminal; and An insulating substrate is integrally connected to the bottom of the insulating base column and is detachably connected to the cover plate.

8. The withstand voltage test tool according to claim 7, characterized in that: The outer surface of the insulating base column is provided with an insulating arch; and / or At least one of the outer surface of the insulating substrate and the inner surface of the insulating substrate is provided with an insulating sleeve, and the insulating sleeve is sleeved on the outer side of the insulating base column.

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