A multi-working-condition integrated type capacitive bushing inter-screen defect simulation device and method

Abstract

The application relates to the technical field of testing electric variables, and particularly discloses a multi-working-condition integrated capacitor bushing inter-screen defect simulation device and method. The multi-working-condition integrated capacitor bushing inter-screen defect simulation device comprises an insulating plug-in shell, and a conductive conducting piece is assembled in the insulating plug-in shell; the conductive contacts of the conductive conducting piece abut against aluminum foil layers of different levels in the capacitor bushing respectively, so that an adjustable and controllable insulation breakdown defect channel is constructed between the capacitor bushing screens. The conductive contacts with different external structures can be replaced to accurately simulate various typical inter-screen breakdown defects such as point-shaped, planar and dendritic defects; the compound defect working condition simulation can be realized by matching the damp structure; all kinds of internal faults in the actual operation of the capacitor bushing can be reproduced in all directions; and the technical problems of the prior art, such as single defect type, uncontrollable defect parameters, poor working condition adaptability and low test repeatability of the prefabricated defect device, are solved.

Description

Technical Field

[0001] This invention relates to the field of electrical variable testing technology, and in particular to a multi-condition integrated capacitive bushing screen defect simulation device and method. Background Technology

[0002] Capacitive bushings are core insulating components of high-voltage equipment such as transformers and circuit breakers in power systems. Their internal capacitor cores are composed of multiple layers of aluminum foil alternately wound with insulating dielectric. During operation, they must withstand multiple stresses, including high electric fields, mechanical vibrations, and changes in ambient temperature and humidity. Operational experience shows that the insulating dielectric between the capacitor core panels is a weak point, easily broken down by mechanical impacts, moisture degradation, or manufacturing defects. This breakdown creates conductive paths, leading to partial discharge, insulation deterioration, and even bushing explosions, seriously affecting the safe and stable operation of the power system.

[0003] To further investigate the breakdown mechanism of inter-shoulder insulation in capacitive bushings, the development law of partial discharge, and to verify the effectiveness of condition assessment methods such as partial discharge monitoring and dielectric loss detection, it is necessary to construct a realistic, controllable, and repeatable simulation platform for inter-shoulder insulation breakdown defects in the laboratory. However, current simulation platforms have the following shortcomings: First, the controllability of the external overvoltage breakdown method is poor: by applying excessive voltage to an intact bushing to force the insulation to break down, the location, morphological characteristics, and degree of damage of the defects cannot be precisely controlled, and high-voltage forced breakdown easily damages other intact insulation structures of the bushing body. Second, the surface contamination simulation method has significant limitations: by simulating the method of coating the outer surface of the bushing with a conductive medium, only surface discharge simulation of the external insulation can be achieved, which cannot reproduce the physical process, discharge characteristics, and degradation law of inter-shoulder insulation breakdown inside the bushing, resulting in a significant difference from the actual internal fault conditions of the equipment. Third, the physical reproduction accuracy of the built-in electrode method is low: the traditional method of pre-embedding metal electrodes inside the capacitor core has physical parameters such as electrode structure, resistivity, and contact resistance that differ significantly from the carbonized conductive channel characteristics generated by actual inter-screen breakdown, making it impossible to accurately reproduce the floating potential discharge characteristics under fault conditions. Furthermore, existing defect simulation methods are mostly limited to single-screen complete breakdown scenarios, failing to cover different breakdown morphologies such as point-like, area-like, and dendritic breakdowns, and unable to reproduce the complex defect scenarios commonly seen in breakdowns accompanied by moisture, resulting in insufficient consistency with actual operational faults. In addition, existing pre-fabricated defects often use sealant to directly fix the conductor, which easily leads to conductor loosening and poor contact during long-term testing. Moreover, the defect type cannot be changed, and the same sample cannot be adapted to multiple test scenarios, resulting in high testing costs and low efficiency.

[0004] Therefore, there is an urgent need in this field for a capacitive bushing inter-panel defect simulation scheme with rich defect types, controllable parameters, rapid switching, and good repeatability to meet the experimental needs of bushing insulation degradation mechanism research and detection technology verification. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a multi-condition integrated capacitive bushing screen defect simulation device and method to solve the technical problems of existing prefabricated defect devices, such as single defect type, uncontrollable defect parameters, poor adaptability to working conditions, and low test repeatability.

[0006] To achieve the above technical objectives, the present invention provides a multi-condition integrated capacitive bushing screen defect simulation device, including an insulating plug housing;

[0007] The insulating plug housing is equipped with a conductive component, which includes a conductive base and at least two conductive contacts protruding from the conductive base. The conductive contacts have an arbitrary breakdown structure shape.

[0008] The insulating insert housing is designed for detachable mounting in a pre-set position on the capacitive bushing. An opening is provided on the insulating insert housing, allowing conductive contacts to pass through the insulating insert housing and abut against different layers of aluminum foil inside the capacitive bushing, thereby creating an adjustable insulation breakdown defect channel between the capacitive bushing panels.

[0009] Furthermore, the preset installation position is a groove opened on the side wall of the capacitor bushing, the bottom of the groove has a stepped structure and exposes at least two layers of aluminum foil of the capacitor bushing.

[0010] The outer wall of the insulating plug housing with the opening is provided with a stepped boss, which is adapted to the groove.

[0011] Furthermore, it includes a booster; the booster includes an insulating push rod, and the insulating insert housing has a guide hole on the side opposite to the aluminum foil layer, and the insulating push rod passes through the guide hole and is detachably connected to the conductive base;

[0012] The insulating push rod slides axially along the guide hole to drive the conductive base to extend or retract the conductive contact, thereby controlling the contact and separation of the conductive contact with the aluminum foil layer.

[0013] Furthermore, a positioning component is provided on the outer wall of the insulating plug housing on the side opposite to the aluminum foil layer. The positioning component includes a positioning base mounted on the insulating plug housing and a positioning baffle mounted on the positioning base.

[0014] The end of the insulating push rod away from the conductive base is equipped with a circumferentially rotatable locking sleeve. The outer wall of the locking sleeve is provided with a limit plate, which can rotate circumferentially with the locking sleeve to engage or disengage from the limiting area of ​​the positioning baffle.

[0015] Furthermore, a damping ring layer is provided on the inner edge of the guide hole or the outer wall of the insulating push rod.

[0016] Furthermore, the conductive component is also provided with an elastic conductive connection section, which is disposed between the conductive base and the conductive contact, so that the conductive contact can adaptively fit the aluminum foil layer.

[0017] Furthermore, it includes three sets of conductive conductors and three sets of boosters, with each conductive conductor and booster corresponding to the other; the first conductive conductor includes a first conductive base and a copper guide rod; the second conductive conductor includes a second conductive base and a rectangular copper foil; the third conductive conductor includes a third conductive base and a multi-strand diverging fine copper wire structure.

[0018] Furthermore, a water-retaining sponge is provided inside the insulating plug housing on the side near the aluminum foil layer, and a slow-release hole is opened on the side of the insulating plug housing corresponding to the water-retaining sponge near the aluminum foil layer; a guide through hole is opened on the side of the insulating plug housing corresponding to the water-retaining sponge away from the aluminum foil layer, and an insulating push rod is inserted through the guide through hole.

[0019] Furthermore, the side wall of the insulating plug housing is provided with a slot positioning component, and the slot positioning component has a first threaded hole; the groove side wall of the capacitor sleeve is provided with a shallow groove that matches the slot positioning component, and a second threaded hole is provided in the shallow groove, and a screw is used to fix it through the first threaded hole and the second threaded hole.

[0020] This invention provides a method for simulating defects between capacitive bushing panels, which uses a multi-condition integrated capacitive bushing panel defect simulation device for simulation, and includes the following steps:

[0021] Step S1: Disassemble the capacitor core of the capacitor sleeve to completely expose the target aluminum foil layer.

[0022] Step S2: Select conductive contacts with corresponding shapes according to preset test conditions, and detachably embed and fix the insulating plug housing to the preset installation position of the capacitive bushing, so that the conductive contacts abut against different aluminum foil layers respectively, and construct a controllable insulation defect channel between the bushing screen.

[0023] In summary, this invention provides a multi-condition integrated capacitive bushing inter-screen defect simulation device, comprising an insulating insert housing; a conductive component is assembled inside the insulating insert housing, the conductive component including a conductive base and at least two conductive contacts protruding from the conductive base, the conductive contacts having arbitrary breakdown structure shapes; the insulating insert housing is used for detachable embedding in a preset installation position of the capacitive bushing; an opening is provided on the insulating insert housing, allowing the conductive contacts to pass through the insulating insert housing and respectively abut against different levels of aluminum foil layers inside the capacitive bushing, thereby constructing an adjustable insulation breakdown defect channel between the capacitive bushing screens. This invention can accurately simulate various typical inter-screen breakdown defects such as point-like, surface-like, and dendritic defects by replacing conductive contacts with different shapes and structures, and can also be combined with a moisture-affected structure to realize composite defect condition simulation, comprehensively reproducing various internal faults in the actual operation of the capacitive bushing. This device has a simple structure, is easy to assemble and disassemble, has controllable defect parameters, and good test repeatability. It can provide a real, reliable, and standardized test model for the study of insulation degradation mechanism between capacitive bushings, analysis of partial discharge development law, and verification of defect detection and condition assessment technology.

[0024] Compared with existing technologies, this invention achieves integrated and controllable simulation of defects between sleeve panels under multiple working conditions and of multiple types. It breaks through the technical bottlenecks of traditional simulation methods, such as single defects, low reproduction degree, and poor stability. It effectively reduces test costs, improves test accuracy and efficiency, and has significant engineering application and scientific research value. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a cross-sectional schematic diagram of a multi-condition integrated capacitive bushing screen defect simulation device provided in Embodiment 9 of the present invention.

[0027] Figure 2 This is a schematic diagram of the capacitor bushing structure provided in Embodiment 9 of the present invention;

[0028] Figure 3 This is a schematic diagram of the groove structure on the capacitor bushing provided in Embodiment 9 of the present invention;

[0029] Figure 4 This is a cross-sectional schematic diagram of a multi-condition integrated capacitive bushing screen defect simulation device provided in Embodiment 9 of the present invention;

[0030] Figure 5This is a schematic diagram of the booster structure provided in Embodiment 9 of the present invention;

[0031] Figure 6 This is a schematic diagram of the simulated structure for moisture-induced deterioration defects provided in Embodiment 9 of the present invention;

[0032] Figure 7 This is a side view of a multi-condition integrated capacitive bushing screen defect simulation device provided in Embodiment 9 of the present invention.

[0033] Reference numerals: 1. Insulating insert housing; 11. Conductive component; 111. Conductive base; 1111. First conductive base; 1112. Second conductive base; 112. Conductive contact; 1121. Copper guide rod; 1122. Rectangular aluminum foil; 113. Elastic conductive connecting section; 1131. First elastic conductive connecting section; 1132. Second elastic conductive connecting section; 12. Opening; 13. Pushing component; 131. Insulating push rod; 132. Locking sleeve; 133. Limiting paddle; 14. Positioning assembly; 141. Positioning base; 142. Positioning baffle; 151. Water-retaining sponge; 152. Slow-release hole; 16. Stepped boss; 17. Slot positioning component; 2. Capacitive sleeve; 21. General's cap; 22. Upper porcelain sleeve; 23. Flange; 24. Lower porcelain sleeve; 25. Groove; 26. Aluminum foil layer; 27. Shallow groove. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection claimed by the present invention.

[0035] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating orientation or positional relationships, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] The raw materials used in this invention are not particularly restricted in their source; they can be purchased on the market or prepared using conventional methods known to those skilled in the art.

[0038] This invention provides a multi-condition integrated capacitive bushing screen defect simulation device, including an insulating plug housing;

[0039] The insulating plug housing is equipped with a conductive component, which includes a conductive base and at least two conductive contacts protruding from the conductive base. The conductive contacts have an arbitrary breakdown structure shape.

[0040] The insulating insert housing is designed for detachable mounting in a pre-set position on the capacitive bushing. An opening is provided on the insulating insert housing, allowing conductive contacts to pass through the insulating insert housing and abut against different layers of aluminum foil inside the capacitive bushing, thereby creating an adjustable insulation breakdown defect channel between the capacitive bushing panels.

[0041] It should be noted that this device adopts an integrated, detachable mechanical structure, using an insulating plug-in housing as the carrier base, which can be directly adapted to the assembly structure of capacitive bushings. The conductive component, as the core defect simulation structure, is positioned and installed as a whole through a conductive base. Multiple sets of protruding conductive contacts can directly connect to different layers of aluminum foil in the capacitive bushing, artificially constructing a controllable conductive channel between the panels to accurately simulate internal insulation breakdown faults in the bushing. Compared to traditional methods involving high-voltage breakdown, external surface contamination, and pre-embedded electrodes, this structure allows for flexible replacement of conductive contacts with different shapes according to test requirements, precisely controlling the defect location, defect morphology, and contact parameters, achieving multi-condition defect simulation, and significantly improving test repeatability and controllability.

[0042] In some embodiments, the preset installation position is a groove formed on the side wall of the capacitor bushing, the bottom of the groove has a stepped structure and exposes at least two layers of aluminum foil of the capacitor bushing; the outer wall of the insulating plug housing on the side with the opening is provided with a stepped boss, and the stepped boss is adapted to the groove.

[0043] It should be noted that the stepped groove on the side wall of the capacitor bushing is a dedicated installation station for the device. The stepped structure can precisely and regularly expose different layers of internal aluminum foil, avoiding the problems of layer obstruction and misalignment caused by traditional opening methods. The outer shell of the insulating plug housing is designed with a stepped boss structure to match it. The two surfaces fit together to effectively limit the phenomenon of misalignment or rotation after the housing is assembled; it can also effectively ensure the installation fit of the insulating plug housing, so that the internal conductive contacts are precisely aligned with the aluminum foil layer.

[0044] In some embodiments, a booster is included; the booster includes an insulating push rod, and a guide hole is provided on the side of the insulating insert housing opposite to the aluminum foil layer. The insulating push rod passes through the guide hole and is detachably connected to the conductive base; the insulating push rod slides axially along the guide hole to drive the conductive base to extend or retract the conductive contact, thereby controlling the contact and separation of the conductive contact from the aluminum foil layer.

[0045] It should be noted that this embodiment features an axially movable insulating push rod, wherein the guide hole provides precise linear guidance constraint for the insulating push rod. Through the axial movement of the insulating push rod, the extension path of the conductive contact can be precisely controlled, flexibly adjusting the contact pressure, contact area, and contact state between the conductive contact and the aluminum foil layer, meeting the testing requirements for different contact levels and different defect conductivity states. In this embodiment, the insulating push rod and the conductive base are detachably connected, facilitating the replacement, maintenance, and repair of the conductive components later.

[0046] In some preferred embodiments, a damping ring layer is provided on the inner edge of the guide hole or the outer wall of the insulating push rod.

[0047] It should be noted that the damping ring is made of a high-friction insulating damping material, which can closely fit the inner wall of the guide hole or the side wall of the insulating push rod, so that the sliding mating surface of the two forms a uniform damping frictional resistance. During the axial movement of the insulating push rod, the uniform damping friction force allows the push rod to achieve adaptive hovering at any extension or retraction position, which can significantly improve the control accuracy and positional stability of the conductive contact extension path.

[0048] In some embodiments, the outer wall of the insulating plug housing opposite to the aluminum foil layer is provided with a positioning component. The positioning component includes a positioning base mounted on the insulating plug housing and a positioning baffle mounted on the positioning base. The end of the insulating push rod away from the conductive base is equipped with a circumferentially rotatable locking sleeve. The outer wall of the locking sleeve is provided with a limit plate. The limit plate can rotate circumferentially with the locking sleeve to engage or disengage from the limiting area of ​​the positioning baffle. The locking and unlocking of the insulating push rod is achieved by the limiting cooperation between the positioning baffle and the limit plate, thereby fixing the working position of the conductive contact.

[0049] It should be noted that the locking sleeve can rotate freely in the circumferential direction relative to the insulating push rod, causing the limiting tab fixed on the outer wall to rotate synchronously. Through the engagement and disengagement of the tab and the positioning baffle, the mechanical locking and quick unlocking of the push rod's extension and retraction position are achieved. When the tab engages with the baffle's limiting area, it can restrict the axial movement of the push rod, firmly locking the extended working position of the conductive contact, avoiding problems such as contact retraction, poor contact, and defect parameter shift caused by electric field vibration and environmental disturbance during high-voltage testing. After the test is completed, rotating the sleeve will unlock the push rod, allowing it to retract and reset freely.

[0050] In some embodiments, the conductive component is further provided with an elastic conductive connection segment, which is disposed between the conductive base and the conductive contact, so that the conductive contact can adaptively conform to the aluminum foil layer.

[0051] It should be noted that the elastic conductive connection section has the dual functions of conductive continuity and elastic deformation compensation. Because different aluminum foil layers inside the sleeve are often at different horizontal positions, rigid conductive contacts are prone to localized poor contact and uneven contact. Through the slight compression deformation of the elastic conductive connection section, assembly gaps and flatness errors can be automatically compensated, ensuring that the conductive contacts completely conform to the aluminum foil layer surface, eliminating the problem of poor localized contact, and significantly improving the consistency of defect simulation and experimental repeatability.

[0052] In some embodiments, the end of the insulating push rod near the conductive contact is configured as a flange-type mating structure.

[0053] It should be noted that the flange-type docking structure increases the contact area between the insulating push rod and the conductive base, improves the coaxiality and assembly stability of the connection structure, ensures uniform stress distribution and prevents deformation and loosening, and can stably transmit axial thrust.

[0054] In some embodiments, the conductive contact is a copper rod, a rectangular copper foil, or a multi-strand diverging fine copper wire structure.

[0055] It should be noted that the three different types of conductive contact structures are adapted to different fault simulation scenarios: the copper conductor rod structure is rigid and has concentrated contact points, which can simulate point-like localized breakdown defects; the rectangular copper foil has a large contact area and uniform conductivity, which can simulate large-scale inter-screen breakdown defects; and the multi-strand divergent fine copper wire structure has a loose shape and strong discharge randomness, which can realistically reproduce dendritic and multi-branch insulation breakdown defects.

[0056] In some embodiments, the device includes three sets of conductive conductors and three sets of boosters, with each conductive conductor and booster corresponding to the other. The first conductive conductor includes a first conductive base and a copper guide rod. The second conductive conductor includes a second conductive base and a rectangular copper foil. The third conductive conductor includes a third conductive base and a multi-strand diverging fine copper wire structure.

[0057] It should be noted that the three sets of independent conductive and booster components are matched with each other, independently controlled, and do not interfere with each other, forming an integrated multi-defect simulation module. It can quickly switch between three typical breakdown defects—point, surface, and dendritic—without replacing the overall device, which can meet the scientific research needs of simulating multiple types of defects.

[0058] In some embodiments, a water-retaining sponge is provided inside the insulating plug housing on the side near the aluminum foil layer, and a slow-release hole is opened on the side of the insulating plug housing corresponding to the water-retaining sponge near the aluminum foil layer; a guide through hole is opened on the side of the insulating plug housing corresponding to the water-retaining sponge away from the aluminum foil layer, and an insulating push rod is inserted through the guide through hole; the insulating push rod is used to squeeze the water-retaining sponge, so that the water absorbed by the water-retaining sponge can quantitatively penetrate into the target area between the capacitive sleeve screens through the slow-release hole, thereby simulating the composite defect of moisture between the screens.

[0059] It should be noted that the water-storing sponge is a flexible water-storing medium that can pre-absorb a fixed amount of water, possessing the characteristics of uniform water storage and pressure-release. The insulating push rod axially compresses the water-storing sponge along the guide hole, controlling the degree of sponge compression deformation through mechanical extrusion force, and precisely regulating the water penetration rate and amount; water permeates evenly and quantitatively into the insulation area between the bushing and the screen through the slow-release holes, simulating the real working condition of moisture deterioration inside the bushing.

[0060] In some embodiments, the side wall of the insulating plug housing is provided with a slot positioning member, and the slot positioning member has a first threaded hole; the groove side wall of the capacitor sleeve has a shallow groove adapted to the slot positioning member, and a second threaded hole is provided in the shallow groove; when the insulating plug housing is embedded in the groove, the slot positioning key engages in the shallow groove and is locked and fixed by screws passing through the first threaded hole and the second threaded hole, thereby restricting the radial and axial movement of the insulating plug housing and achieving a stable overall installation.

[0061] It should be noted that this embodiment employs a dual mechanical fixing structure of snap-fit ​​and threaded locking. The snap-fit ​​positioning component and the shallow groove of the sleeve form a precise snap-fit ​​limit, which can initially restrict the radial offset and circumferential rotation of the shell. Combined with the threaded fastening structure of the through screw and double threaded hole, a compression fixation is achieved, completely eliminating the problems of movement and loosening of the shell after assembly. The dual limiting structure provides a firm assembly and convenient disassembly, making it suitable for long-term high-voltage alternating test conditions and effectively solving the problems of easy aging, loosening, and difficult disassembly of traditional adhesive fixing methods.

[0062] This invention provides a method for simulating defects between capacitive bushing panels, using a multi-condition integrated capacitive bushing panel defect simulation device, comprising the following steps:

[0063] Step S1: Disassemble the capacitor core of the capacitor sleeve to completely expose the target aluminum foil layer.

[0064] Step S2: Select conductive contacts with corresponding shapes according to preset test conditions, and detachably embed and fix the insulating plug housing to the preset installation position of the capacitive bushing, so that the conductive contacts abut against different aluminum foil layers respectively, and construct a controllable insulation defect channel between the bushing screen.

[0065] The applicant further provides the following specific embodiments to describe the present invention. It should be noted that these embodiments are merely descriptive and do not limit the present invention in any way.

[0066] Example 1

[0067] This embodiment provides a multi-condition integrated capacitive bushing screen defect simulation device, including an insulating plug housing;

[0068] The insulating plug housing is equipped with a conductive component, which includes a conductive base and two conductive contacts protruding from the conductive base. The conductive contacts have an arbitrary breakdown structure shape.

[0069] The insulating insert housing is detachably embedded in the preset installation position of the capacitive bushing; the insulating insert housing has an opening, which allows the conductive contacts to pass through the insulating insert housing and abut against different layers of aluminum foil inside the capacitive bushing, so as to construct an adjustable insulation breakdown defect channel between the capacitive bushing screens.

[0070] This embodiment provides a method for simulating defects between capacitive bushing panels, which uses a multi-condition integrated capacitive bushing panel defect simulation device for simulation, and includes the following steps:

[0071] Step S1: Disassemble the capacitor core of the capacitor bushing to be tested, peel off the outer insulating wrapping layer of the core, accurately expose the two target aluminum foil layers required for the test, and clean the dust, oil and insulating debris on the surface of the aluminum foil layers to ensure that the contact surface is flat and clean and free from impurities that interfere with conductive contact.

[0072] Step S2: Select the conductive contact with the corresponding shape and structure according to the preset test defect conditions and assemble and fix it on the conductive base to complete the overall assembly of the conductive component; detachably embed and fix the assembled insulating plug shell to the preset installation position of the capacitor bushing.

[0073] Step S3: Fine-tune the assembly position of the insulating plug housing so that the two conductive contacts precisely pass through the housing opening and tightly adhere to the two target aluminum foil layers respectively, thereby stably constructing an insulation breakdown defect channel with controllable parameters and shape between the two layers of the capacitive bushing.

[0074] Example 2

[0075] This embodiment provides a multi-condition integrated capacitive bushing screen defect simulation device, including an insulating plug housing;

[0076] The insulating plug housing is equipped with a conductive component, which includes a conductive base and two conductive contacts protruding from the conductive base. The conductive contacts have an arbitrary breakdown structure shape.

[0077] The end sidewall of the capacitor bushing has a groove with a stepped bottom that exposes two adjacent aluminum foil layers of the capacitor bushing; the outer wall of the insulating plug housing has a stepped boss that matches the groove.

[0078] An opening is provided on the side of the insulating plug housing near the aluminum foil layer. The opening allows the conductive contacts to pass through the insulating plug housing under gravity and contact the exposed aluminum foil layers of different levels, so as to construct an adjustable insulation breakdown defect channel between the capacitive bushing screens.

[0079] This embodiment also provides a method for simulating defects between capacitive bushing screens, which uses the multi-condition integrated capacitive bushing screen defect simulation device of this embodiment for simulation, and includes the following steps:

[0080] Step S1: Create a stepped groove in the preset test area of ​​the sleeve capacitor core. Precisely expose at least two layers of target capacitor screen aluminum foil through the hierarchical structure of the stepped groove, and clean the inner wall of the groove and the aluminum foil contact surface.

[0081] Step S2: Select the corresponding type and shape of conductive contact according to the preset test conditions, and stably assemble the conductive contact on the conductive base to complete the assembly of the conductive component; align the insulating plug housing with the stepped groove of the sleeve and insert it into place, so that the stepped protrusion on the outer wall of the insulating plug housing fits perfectly with the groove, thereby achieving precise positioning and fixation of the housing.

[0082] Step S3: Relying on the gravity of the conductive contact itself, the conductive contact automatically extends downward from the opening of the shell and adaptively adheres to the two exposed aluminum foil layers of different levels. Stable conductive contact can be achieved without manual adjustment, thus constructing a gravity self-adhesive insulation defect channel between the sleeve and the screen.

[0083] Example 3

[0084] This embodiment provides a multi-condition integrated capacitive bushing screen defect simulation device, including an insulating plug housing;

[0085] The insulating plug housing is equipped with a conductive component, which includes a conductive base and two conductive contacts protruding from the conductive base. The conductive contacts have an arbitrary breakdown structure shape.

[0086] The side wall of the capacitor bushing has a groove with a stepped structure at the bottom, exposing two adjacent aluminum foil layers of the capacitor bushing; the outer wall of the insulating plug housing has a stepped boss that matches the groove.

[0087] An opening is provided on the side of the insulating plug housing near the aluminum foil layer, allowing the conductive contacts to pass through the insulating plug housing and abut against different layers of aluminum foil exposed in the capacitive bushing, thereby creating an adjustable insulation breakdown defect channel between the capacitive bushing panels.

[0088] The insulating plug housing has a guide hole on the side away from the aluminum foil layer. The insulating push rod passes through the guide hole and is detachably connected to the conductive base. The insulating push rod slides axially along the guide hole to drive the conductive base to extend or retract the conductive contact, thereby controlling the contact and separation of the conductive contact from the aluminum foil layer.

[0089] This embodiment also provides a method for simulating defects between capacitive bushing screens, which uses the multi-condition integrated capacitive bushing screen defect simulation device of this embodiment for simulation, and includes the following steps:

[0090] Step S1: Process a stepped groove at the preset test position of the capacitor core of the capacitor sleeve to expose two or more target aluminum foil layers, and clean the impurities on the surface of the groove and aluminum foil layers.

[0091] Step S2: Select and match conductive contacts with corresponding shapes according to the test requirements to complete the assembly of conductive components; embed the insulating plug housing into the sleeve groove, and complete the precise positioning and installation through the matching structure of the stepped boss and the groove; insert the insulating push rod into the guide through hole and complete the detachable assembly with the conductive base.

[0092] Step S3: Manually push the insulating push rod along the axial direction of the guide hole to drive the conductive base to extend the conductive contact from the shell opening until the conductive contact is in close contact with the two aluminum foil layers to build a defect channel between the screens; after the test is completed, pull the insulating push rod in the opposite direction to drive the conductive contact to retract and detach from the aluminum foil layer, so as to achieve rapid removal of defects. The defect cutting state can be flexibly switched to adapt to multiple sets of dynamic comparison tests.

[0093] Example 4

[0094] This embodiment provides a multi-condition integrated capacitive bushing screen defect simulation device, including an insulating plug housing;

[0095] The insulating plug housing is equipped with a conductive component, which includes a conductive base and two conductive contacts protruding from the conductive base. The conductive contacts have an arbitrary breakdown structure shape.

[0096] The side wall of the capacitor bushing has a groove with a stepped structure at the bottom, exposing two adjacent aluminum foil layers of the capacitor bushing; the outer wall of the insulating plug housing has a stepped boss that matches the groove.

[0097] An opening is provided on the side of the insulating plug housing near the aluminum foil layer, allowing the conductive contacts to pass through the insulating plug housing and abut against different layers of aluminum foil exposed in the capacitive bushing, thereby creating an adjustable insulation breakdown defect channel between the capacitive bushing panels.

[0098] The insulating insert housing has a guide hole on the side facing away from the aluminum foil layer. The insulating push rod passes through the guide hole and is detachably connected to the conductive base. The insulating push rod slides axially along the guide hole to drive the conductive base to extend or retract the conductive contact, thereby controlling the contact and separation of the conductive contact from the aluminum foil layer. A rotatable locking sleeve is fitted to the end of the insulating push rod away from the conductive base. A limit plate is provided on the outer wall of the locking sleeve. A positioning assembly is provided on the outer wall of the insulating insert housing facing away from the aluminum foil layer. The positioning assembly includes a positioning base mounted on the insulating insert housing and a positioning baffle mounted on the positioning base. The limit plate can rotate circumferentially with the locking sleeve to engage or disengage from the limiting area of ​​the positioning baffle. The locking and unlocking of the insulating push rod is achieved by the limiting cooperation between the positioning baffle and the limit plate, thereby fixing the working position of the conductive contact.

[0099] This embodiment also provides a method for simulating defects between capacitive bushing screens, which uses the multi-condition integrated capacitive bushing screen defect simulation device of this embodiment for simulation, and includes the following steps:

[0100] Step S1: Process a stepped groove at the preset test position of the capacitor core of the capacitor sleeve to expose two or more target aluminum foil layers, and clean the impurities on the surface of the groove and aluminum foil layers.

[0101] Step S2: Select the conductive contacts required for the test, assemble the conductive components and booster structure, and embed and fix the insulating plug housing into the sleeve groove to complete the overall assembly and positioning.

[0102] Step S3: The insulating push rod is pushed axially to drive the conductive contact to extend and stably abut against the two aluminum foil layers, precisely controlling the contact stroke and contact pressure of the conductive contact; after reaching the position, the locking sleeve is rotated circumferentially to make the outer wall limit plate engage with the limiting area of ​​the positioning baffle, thereby achieving mechanical locking of the insulating push rod, firmly fixing the working position of the conductive contact, and avoiding the problems of conductive contact displacement and loosening caused by high voltage test vibration and electric field disturbance.

[0103] Step S4: Conduct a screen defect simulation test. After the test, rotate the locking sleeve in the opposite direction to disengage the limit lever from the limit area, release the push rod lock, retract the push rod and conductive contact, and complete the test reset.

[0104] Example 5

[0105] This embodiment provides a multi-condition integrated capacitive bushing screen defect simulation device, including an insulating plug housing;

[0106] The insulating plug housing is equipped with a conductive component, which includes a conductive base and two conductive contacts protruding from the conductive base. The conductive contacts have an arbitrary breakdown structure shape.

[0107] The side wall of the capacitor bushing has a groove with a stepped structure at the bottom, exposing two adjacent aluminum foil layers of the capacitor bushing; the outer wall of the insulating plug housing has a stepped boss that matches the groove.

[0108] An opening is provided on the side of the insulating plug housing near the aluminum foil layer, allowing the conductive contacts to pass through the insulating plug housing and abut against different layers of aluminum foil exposed in the capacitive bushing, thereby creating an adjustable insulation breakdown defect channel between the capacitive bushing panels.

[0109] The insulating plug housing has a guide hole on the side away from the aluminum foil layer. The insulating push rod passes through the guide hole and is detachably connected to the conductive base. The insulating push rod slides axially along the guide hole to drive the conductive base to extend or retract the conductive contact, thereby controlling the contact and separation of the conductive contact with the aluminum foil layer. A damping ring layer is also provided on the inner edge of the guide hole or the outer wall of the insulating push rod.

[0110] This embodiment also provides a method for simulating defects between capacitive bushing screens, which uses the multi-condition integrated capacitive bushing screen defect simulation device of this embodiment for simulation, and includes the following steps:

[0111] Step S1: Process a stepped groove at the preset test position of the capacitor core of the capacitor sleeve to expose two or more target aluminum foil layers, and clean the impurities on the surface of the groove and aluminum foil layers.

[0112] Step S2: Complete the modular assembly of each structure of the device, insert the insulating push rod with damping ring into the guide through hole, dock and fix it with the conductive base, and then embed the whole into the sleeve groove to complete the positioning.

[0113] Step S3: Relying on the friction damping characteristics of the damping ring, the insulating push rod is slowly and smoothly pushed. The damping hovering function is used to achieve precise positioning of the push rod at any position. The extension path and contact pressure of the conductive contact are finely adjusted to precisely control the conduction parameters of the inter-screen defects. After the conductive contact is stably attached to the aluminum foil layer, the position is kept fixed, and a high-precision defect simulation test is carried out.

[0114] Step S4: After the test, the push rod is smoothly retracted. The damping structure can effectively avoid the impact displacement caused by the rapid retraction of the conductive contact, ensuring the consistency of adjustment parameters in each test and improving the repeatability of the test.

[0115] Example 6

[0116] This embodiment provides a multi-condition integrated capacitive bushing screen defect simulation device, including an insulating plug housing;

[0117] The insulating plug housing is equipped with a conductive component, which includes a conductive base and two conductive contacts protruding from the conductive base. The conductive contacts have an arbitrary breakdown structure shape.

[0118] The side wall of the capacitor bushing has a groove with a stepped structure at the bottom, exposing two adjacent aluminum foil layers of the capacitor bushing; the outer wall of the insulating plug housing has a stepped boss that matches the groove.

[0119] An opening is provided on the side of the insulating plug housing near the aluminum foil layer, allowing the conductive contacts to pass through the insulating plug housing and abut against different layers of aluminum foil exposed in the capacitive bushing, thereby creating an adjustable insulation breakdown defect channel between the capacitive bushing panels.

[0120] The insulating insert housing has a guide hole on the side facing away from the aluminum foil layer. The insulating push rod passes through the guide hole and is detachably connected to the conductive base. The insulating push rod slides axially along the guide hole to drive the conductive base to extend or retract the conductive contact, thereby controlling the contact and separation of the conductive contact from the aluminum foil layer. A rotatable locking sleeve is fitted to the end of the insulating push rod away from the conductive base. A limit plate is provided on the outer wall of the locking sleeve. A positioning assembly is provided on the outer wall of the insulating insert housing facing away from the aluminum foil layer. The positioning assembly includes a positioning base mounted on the insulating insert housing and a positioning baffle mounted on the positioning base. The limit plate can rotate circumferentially with the locking sleeve to engage or disengage from the limiting area of ​​the positioning baffle. The locking and unlocking of the insulating push rod is achieved by the limiting cooperation between the positioning baffle and the limit plate, thereby fixing the working position of the conductive contact.

[0121] This embodiment also provides a method for simulating defects between capacitive bushing screens, which uses the multi-condition integrated capacitive bushing screen defect simulation device of this embodiment for simulation, and includes the following steps:

[0122] Step S1: Process a stepped groove at a preset position on the capacitor bushing core, expose two layers of target aluminum foil and clean them to complete the basic test setup.

[0123] Step S2: Based on the preset defect morphology test requirements, select a copper guide rod, a rectangular copper foil, or a multi-strand diverging fine copper wire structure and a booster. After assembly, embed and fix the insulating plug housing as a whole into the sleeve groove.

[0124] Step S3: Axially adjust the insulating push rod of the corresponding group, drive the conductive contact to extend and fit the aluminum foil layer, and rotate the locking sleeve to lock the position after it is in place, thereby constructing point-like local defects, surface-like global defects or dendritic multi-branch defects respectively.

[0125] Step S4: After a single test is completed, unlock the locking structure, retract the conductive contact, replace the next conductive contact, repeat the locking steps, and conduct continuous tests under multiple operating conditions. This embodiment allows for rapid switching between multiple defect conditions on the same sleeve specimen by replacing different conductive contacts, enabling comparative tests of multiple morphological defects to be completed without changing the specimen.

[0126] Example 7

[0127] This embodiment provides a multi-condition integrated capacitive bushing screen defect simulation device, including an insulating plug housing;

[0128] The insulating plug housing is equipped with a conductive component, which includes a conductive base and two conductive contacts protruding from the conductive base. The conductive contacts have an arbitrary breakdown structure shape.

[0129] The side wall of the capacitor bushing has a groove with a stepped structure at the bottom, exposing two adjacent aluminum foil layers of the capacitor bushing; the outer wall of the insulating plug housing has a stepped boss that matches the groove.

[0130] An opening is provided on the side of the insulating plug housing near the aluminum foil layer, allowing the conductive contacts to pass through the insulating plug housing and abut against different layers of aluminum foil exposed in the capacitive bushing, thereby creating an adjustable insulation breakdown defect channel between the capacitive bushing panels.

[0131] The insulating insert housing has a guide hole on the side facing away from the aluminum foil layer. The insulating push rod passes through the guide hole and is detachably connected to the conductive base. The insulating push rod slides axially along the guide hole to drive the conductive base to extend or retract the conductive contact, thereby controlling the contact and separation of the conductive contact from the aluminum foil layer. A rotatable locking sleeve is fitted to the end of the insulating push rod away from the conductive base. A limit plate is provided on the outer wall of the locking sleeve. A positioning assembly is provided on the outer wall of the insulating insert housing facing away from the aluminum foil layer. The positioning assembly includes a positioning base mounted on the insulating insert housing and a positioning baffle mounted on the positioning base. The limit plate can rotate circumferentially with the locking sleeve to engage or disengage from the limiting area of ​​the positioning baffle. The locking and unlocking of the insulating push rod is achieved by the limiting cooperation between the positioning baffle and the limit plate, thereby fixing the working position of the conductive contact.

[0132] The insulating plug housing is provided with three sets of conductive conductors and three sets of booster components, with each conductive conductor and booster component corresponding to the other. The first conductive conductor includes a first conductive base and a copper guide rod. The second conductive conductor includes a second conductive base and a rectangular copper foil. The third conductive conductor includes a third conductive base and a multi-strand diverging fine copper wire structure.

[0133] A water-retaining sponge is installed inside the insulating plug housing on the side near the aluminum foil layer. A slow-release hole is opened on the side of the insulating plug housing corresponding to the water-retaining sponge that is near the aluminum foil layer. A guide hole is opened on the side of the insulating plug housing corresponding to the water-retaining sponge that is away from the aluminum foil layer. An insulating push rod is inserted through the guide hole. The insulating push rod is used to squeeze the water-retaining sponge, so that the water absorbed by the water-retaining sponge can be quantitatively permeated into the target area between the capacitive sleeve screens through the slow-release hole, thereby simulating the composite defect of moisture between the screens.

[0134] This embodiment also provides a method for simulating defects between capacitive bushing screens, which uses the multi-condition integrated capacitive bushing screen defect simulation device of this embodiment for simulation, and includes the following steps:

[0135] Step S1: Create a stepped groove on the bottom surface of the pre-set test area of ​​the capacitor core of the capacitor sleeve to completely expose the two aluminum foil layers of the target capacitor screen, and clean the groove and the surface of the aluminum foil layers to remove impurities.

[0136] Step S2: The insulating plug housing is embedded and fixed in the groove, so that the stepped boss on the outer wall of the insulating plug housing fits precisely with the groove; according to the preset test conditions, the corresponding type of conductive contact is selected and assembled at the bottom of the insulating push rod to complete the assembly of the multi-morphological defect module.

[0137] Step S3: Vertically adjust the position of the insulating push rod to make the conductive contact stably contact the two layers of exposed aluminum foil of the capacitor screen. Rotate the locking sleeve circumferentially to make the limiting plate engage with the limiting range of the positioning baffle, lock the working position of the conductive contact, and build a stable inter-screen breakdown defect channel.

[0138] Step S4: If it is necessary to simulate conventional dry breakdown defects, high voltage test and discharge characteristic test are carried out directly; if it is necessary to simulate moisture composite defects, the water-storage sponge is pre-soaked with water in a quantitative manner, and the water-storage sponge is squeezed by pressing down the insulating push rod, so that the water absorbed by the sponge can be evenly and quantitatively penetrated into the insulation area between the bushing and the screen through the slow release hole, creating a controllable moisture degradation environment and realizing the simulation of breakdown-moisture composite defects.

[0139] Step S5: After the test is completed, unlock the locking structure, retract the push rod, stop squeezing the water-storing sponge, terminate the damp condition, and complete the test reset.

[0140] Example 8

[0141] This embodiment provides a multi-condition integrated capacitive bushing screen defect simulation device, including an insulating plug housing;

[0142] The insulating plug housing contains a conductive component, which includes a conductive base, an elastic conductive connecting section, and two conductive contacts. The conductive contacts protrude from the conductive base via the elastic conductive connecting section, allowing them to adaptively conform to the aluminum foil layer. The conductive contacts have an arbitrary breakdown structure shape.

[0143] The side wall of the capacitor bushing has a groove with a stepped structure at the bottom, exposing two adjacent aluminum foil layers of the capacitor bushing; the outer wall of the insulating plug housing has a stepped boss that matches the groove.

[0144] An opening is provided on the side of the insulating plug housing near the aluminum foil layer, allowing the conductive contacts to pass through the insulating plug housing and abut against different layers of aluminum foil exposed in the capacitive bushing, thereby creating an adjustable insulation breakdown defect channel between the capacitive bushing panels.

[0145] The insulating insert housing has a guide hole on the side facing away from the aluminum foil layer. The insulating push rod passes through the guide hole and is detachably connected to the conductive base. The insulating push rod slides axially along the guide hole to drive the conductive base to extend or retract the conductive contact, thereby controlling the contact and separation of the conductive contact from the aluminum foil layer. A rotatable locking sleeve is fitted to the end of the insulating push rod away from the conductive base. A limit plate is provided on the outer wall of the locking sleeve. A positioning assembly is provided on the outer wall of the insulating insert housing facing away from the aluminum foil layer. The positioning assembly includes a positioning base mounted on the insulating insert housing and a positioning baffle mounted on the positioning base. The limit plate can rotate circumferentially with the locking sleeve to engage or disengage from the limiting area of ​​the positioning baffle. The locking and unlocking of the insulating push rod is achieved by the limiting cooperation between the positioning baffle and the limit plate, thereby fixing the working position of the conductive contact.

[0146] The insulating plug housing includes three sets of conductive elements and three sets of booster elements, with each conductive element and booster element corresponding to the others. The first conductive element includes a first conductive base and a copper guide rod. The second conductive element includes a second conductive base and a rectangular copper foil. The third conductive element includes a third conductive base and a multi-strand diverging fine copper wire structure.

[0147] A water-retaining sponge is installed inside the insulating plug housing on the side near the aluminum foil layer. A slow-release hole is opened on the side of the insulating plug housing corresponding to the water-retaining sponge that is near the aluminum foil layer. A guide hole is opened on the side of the insulating plug housing corresponding to the water-retaining sponge that is away from the aluminum foil layer. An insulating push rod is inserted through the guide hole. The insulating push rod is used to squeeze the water-retaining sponge, so that the water absorbed by the water-retaining sponge can be quantitatively permeated into the target area between the capacitive sleeve screens through the slow-release hole, thereby simulating the composite defect of moisture between the screens.

[0148] This embodiment also provides a method for simulating defects between capacitive bushing screens, which uses the multi-condition integrated capacitive bushing screen defect simulation device of this embodiment for simulation, and includes the following steps:

[0149] Step S1: Machining the stepped assembly groove of the sleeve exposes the two layers of aluminum foil, cleans the contact surface, removes uneven impurities, and ensures that the assembly reference is flat.

[0150] Step S2: Select a conductive contact with the corresponding shape according to the test conditions, and assemble the conductive contact and the conductive base by relying on the elastic conductive connection section to form an adaptive conductive component; assemble the conductive component and the booster component accordingly, and fix the whole assembly in the sleeve groove.

[0151] Step S3: The insulating push rod is pushed axially to drive the conductive contact to extend out of the contact aluminum foil layer. Through the slight elastic deformation of the elastic conductive connection section, the distance between different aluminum foil layers is automatically compensated to achieve uniform contact of the conductive contact without gaps. After it is in place, the locking sleeve is rotated to complete the position locking.

[0152] Step S4: Selectively activate the moisture simulation working condition according to the test requirements, and use the push rod to squeeze the water-storing sponge to achieve quantitative water seepage, construct a multi-morphology and composite inter-screen defect with high fit and high stability, and carry out insulation degradation and partial discharge tests.

[0153] Example 9

[0154] This embodiment provides a multi-condition integrated capacitive bushing inter-panel defect simulation device, including an insulating plug housing 1; see [link to documentation]. Figure 1 The insulating plug housing 1 is internally equipped with a conductive component 11, which includes a conductive base 111, two conductive contacts 112, and an elastic conductive connecting section 113. The conductive contacts 112 protrude from the conductive base 111 through the elastic conductive connecting section 113, allowing the conductive contacts 112 to adaptively conform to the aluminum foil layer 26. The conductive contacts 112 can adopt any shape and structure.

[0155] See Figure 2 The capacitor bushing 2 consists of a cap 21, an upper porcelain sleeve 22, a flange 23, and a lower porcelain sleeve 24. A groove 25 is formed on the side wall of the capacitor bushing 2. The bottom of the groove 25 has a stepped structure and exposes at least two layers of aluminum foil 26 of the capacitor bushing 2. A stepped boss 16 is provided on the outer wall of the insulating plug housing 1, which is adapted to the groove 25. A slot positioning component 17 protrudes from the side wall of the insulating plug housing 1, and a first threaded hole is formed on the slot positioning component 17. A shallow groove 27 adapted to the slot positioning component 17 is formed on the side wall of the groove 25 of the capacitor bushing 2, and a second threaded hole is formed in the shallow groove 27. When the insulating plug housing 1 is inserted into the groove 25, the slot positioning component 17 engages inside the shallow groove 27 and is locked and fixed by screws passing through the first and second threaded holes, restricting the radial and axial movement of the insulating plug housing 1 and achieving a stable overall installation.

[0156] An opening 12 is provided on the side of the insulating plug housing 1 near the aluminum foil layer 26. The opening 12 allows two conductive contacts 112 to pass through the insulating plug housing 1 and abut against different layers of aluminum foil 26 exposed in the capacitive sleeve 2, so as to construct an adjustable insulation breakdown defect channel between the screens of the capacitive sleeve 2.

[0157] The insulating insert housing 1 has a guide hole on the side opposite to the aluminum foil layer 26. The pusher 13 includes an insulating push rod 131, which passes through the guide hole and is detachably connected to the conductive base 111. The insulating push rod 131 slides axially along the guide hole to drive the conductive base 111 to extend or retract the conductive contact 112, thereby controlling the contact and separation of the conductive contact 112 from the aluminum foil layer 26. See also Figure 4 The insulating push rod 131 is equipped with a rotatable locking sleeve 132 at the end away from the conductive base 111. The outer wall of the locking sleeve 132 is provided with a limiting piece 133. The outer wall of the insulating plug housing 1 away from the aluminum foil layer 26 is provided with a positioning component 14. The positioning component 14 includes a positioning base 141 installed on the insulating plug housing 1 and a positioning baffle 142 installed on the positioning base 141. The limiting piece 133 can rotate circumferentially with the locking sleeve 132 to engage or disengage from the limiting area of ​​the positioning baffle 142. The locking and unlocking of the insulating push rod 131 is achieved by the limiting cooperation between the positioning baffle 142 and the limiting piece 133, thereby fixing the working position of the conductive contact 112.

[0158] In this embodiment, see Figure 1 The insulating plug housing 1 includes three sets of conductive conductors 11 and three sets of boosters 13, with each conductive conductor 11 and booster 13 corresponding to the other. The first conductive conductor includes a first conductive base 1111, a copper guide rod 1121, and a first elastic conductive connecting section 1131. The second conductive conductor includes a second conductive base 1112, a rectangular copper foil 1122, and a second elastic conductive connecting section 1132. The third conductive conductor includes a third conductive base (not shown in the figure), a multi-strand diverging fine copper wire structure (not shown in the figure), and a third elastic conductive connecting section (not shown in the figure).

[0159] See Figure 5 A water-retaining sponge 151 is provided inside the insulating plug housing 1 on the side near the aluminum foil layer 26. A slow-release hole 152 is opened on the side of the insulating plug housing 1 near the aluminum foil layer 26 corresponding to the water-retaining sponge 151. A guide through hole is opened on the side of the insulating plug housing 1 away from the aluminum foil layer 26 corresponding to the water-retaining sponge 151. An insulating push rod 131 is inserted through the guide through hole. The insulating push rod 131 is used to squeeze the water-retaining sponge 151, so that the water absorbed by the water-retaining sponge 151 can be quantitatively permeated into the target area between the screens of the capacitive sleeve 2 through the slow-release hole 152, thereby simulating the composite defect of moisture between the screens.

[0160] See Figure 6The insulating plug housing 1 has a slot positioning component 17 protruding from its side wall, and a first threaded hole is provided on the slot positioning component 17; the groove 25 of the capacitor sleeve 2 has a shallow groove 27 adapted to the slot positioning component 17 on its side wall, and a second threaded hole is provided in the shallow groove 27; when the insulating plug housing 1 is inserted into the groove 25, the slot positioning component 17 is engaged inside the shallow groove 27, and is locked and fixed by screws passing through the first threaded hole and the second threaded hole, which restricts the radial and axial movement of the insulating plug housing 1 and achieves a stable overall installation.

[0161] This embodiment also provides a method for simulating defects between capacitive bushing screens, which uses the multi-condition integrated capacitive bushing screen defect simulation device of this embodiment for simulation, and includes the following steps:

[0162] Step S1: Machining the stepped assembly groove of the sleeve exposes the two layers of aluminum foil, cleans the contact surface, removes uneven impurities, and ensures that the assembly reference is flat.

[0163] Step S2: Select a conductive contact with the corresponding shape according to the test conditions, and assemble the conductive contact and the conductive base by relying on the elastic conductive connection section to form an adaptive conductive component; assemble the conductive component and the booster component accordingly, and fix the whole component in the sleeve groove and make the slot positioning component and the shallow groove fit together synchronously, and fix it through with screws.

[0164] Step S3: The insulating push rod is pushed axially to drive the conductive contact to extend out of the contact aluminum foil layer. Through the slight elastic deformation of the elastic conductive connection section, the assembly gap between the aluminum foil layers is automatically compensated to achieve uniform contact of the conductive contact without gaps. After it is in place, the locking sleeve is rotated to complete the position locking.

[0165] Step S4: Selectively activate the moisture simulation working condition according to the test requirements, and use the push rod to squeeze the water-storing sponge to achieve quantitative water seepage, construct a multi-morphology and composite inter-screen defect with high fit and high stability, and carry out insulation degradation and partial discharge tests.

[0166] Example 10

[0167] This embodiment provides a multi-condition integrated capacitive bushing screen defect simulation device, including an insulating plug housing;

[0168] The insulating plug housing contains a conductive component, which includes a conductive base, an elastic conductive connecting section, and two conductive contacts. The conductive contacts protrude from the conductive base via the elastic conductive connecting section, allowing them to adaptively conform to the aluminum foil layer. The conductive contacts have an arbitrary breakdown structure shape.

[0169] The insulating insert housing is detachably embedded in the preset installation position of the capacitive bushing; the insulating insert housing has an opening, which allows the conductive contacts to pass through the insulating insert housing and abut against different layers of aluminum foil inside the capacitive bushing, so as to construct an adjustable insulation breakdown defect channel between the capacitive bushing screens.

[0170] The side wall of the insulating plug housing is provided with a slot positioning component, and the slot positioning component has a first threaded hole; the side wall of the capacitor sleeve has a shallow groove that matches the slot positioning component, and a second threaded hole is provided in the shallow groove; when the insulating plug housing is inserted into the groove, the slot positioning key engages inside the shallow groove and is locked and fixed by screws passing through the first threaded hole and the second threaded hole, which restricts the radial and axial movement of the insulating plug housing and achieves a stable overall installation.

[0171] This embodiment also provides a method for simulating defects between capacitive bushing screens, which uses the multi-condition integrated capacitive bushing screen defect simulation device of this embodiment for simulation, and includes the following steps:

[0172] Step S1: Create a groove with a stepped bottom structure in the preset test area of ​​the capacitor core of the capacitor sleeve, expose at least two layers of target aluminum foil by means of the stepped groove, and clean the inner wall of the groove and the contact surface of the aluminum foil layer.

[0173] Step S2: Select the conductive contact with the corresponding shape according to the requirements of the breakdown defect test, assemble it into the conductive base to complete the assembly of the conductive component; align the insulating plug housing with the groove and insert it, so that the stepped boss and the groove are completely fitted, the slot positioning piece is inserted into the shallow groove, and the screw is inserted to lock and fix the insulating plug housing.

[0174] In step S3, the conductive contact extends from the opening and adaptively adheres to two layers of aluminum foil of different grades, forming a fixed insulation breakdown channel between the bushing screens.

[0175] Example 11

[0176] This embodiment provides a multi-condition integrated capacitive bushing screen defect simulation device, including an insulating plug housing;

[0177] The insulating plug housing contains a conductive component, which includes a conductive base, an elastic conductive connecting section, and two conductive contacts. The conductive contacts protrude from the conductive base via the elastic conductive connecting section, allowing them to adaptively conform to the aluminum foil layer. The conductive contacts have an arbitrary breakdown structure shape.

[0178] The insulating insert housing is detachably embedded in the preset installation position of the capacitive bushing; the insulating insert housing has an opening, which allows the conductive contacts to pass through the insulating insert housing and abut against different layers of aluminum foil inside the capacitive bushing, so as to construct an adjustable insulation breakdown defect channel between the capacitive bushing screens.

[0179] The side wall of the insulating plug housing is provided with a slot positioning component, and the slot positioning component has a first threaded hole; the side wall of the capacitor sleeve has a shallow groove that matches the slot positioning component, and a second threaded hole is provided in the shallow groove; when the insulating plug housing is inserted into the groove, the slot positioning key engages inside the shallow groove and is locked and fixed by screws passing through the first threaded hole and the second threaded hole, which restricts the radial and axial movement of the insulating plug housing and achieves a stable overall installation.

[0180] The insulating insert housing has a guide hole on the side facing away from the aluminum foil layer. The insulating push rod passes through the guide hole and is detachably connected to the conductive base. The insulating push rod slides axially along the guide hole to drive the conductive base to extend or retract the conductive contact, thereby controlling the contact and separation of the conductive contact from the aluminum foil layer. A rotatable locking sleeve is fitted to the end of the insulating push rod away from the conductive base. A limit plate is provided on the outer wall of the locking sleeve. A positioning assembly is provided on the outer wall of the insulating insert housing facing away from the aluminum foil layer. The positioning assembly includes a positioning base mounted on the insulating insert housing and a positioning baffle mounted on the positioning base. The limit plate can rotate circumferentially with the locking sleeve to engage or disengage from the limiting area of ​​the positioning baffle. The locking and unlocking of the insulating push rod is achieved by the limiting cooperation between the positioning baffle and the limit plate, thereby fixing the working position of the conductive contact.

[0181] This embodiment also provides a method for simulating defects between capacitive bushing screens, which uses the multi-condition integrated capacitive bushing screen defect simulation device of this embodiment for simulation, and includes the following steps:

[0182] Step S1: Create a groove with a stepped bottom structure in the preset test area of ​​the capacitor core of the capacitor sleeve, expose at least two layers of target aluminum foil by means of the stepped groove, and clean the inner wall of the groove and the contact surface of the aluminum foil layer.

[0183] Step S2: Select the conductive contact with the corresponding shape according to the breakdown defect test requirements and assemble it into the conductive base to complete the assembly of the conductive component; align the insulating plug housing with the groove and insert it so that the stepped boss and the groove are completely fitted, the slot positioning piece is inserted into the shallow groove, and the screw is inserted to lock and fix the insulating plug housing.

[0184] Step S3: Axially push the insulating push rod to drive the conductive base and conductive contact to extend from the opening and adhere to the aluminum foil layer; rotate the locking sleeve to make the limiting plate engage with the positioning baffle to lock the push rod, fix the contact distance of the contact, build a stable and controllable inter-screen breakdown channel, and carry out insulation defect simulation under different contact depths;

[0185] Step S4: After the test is completed, rotate the locking sleeve to unlock it, and pull back the insulating push rod to separate the conductive contact from the aluminum foil layer.

[0186] Example 12

[0187] This embodiment provides a multi-condition integrated capacitive bushing screen defect simulation device, including an insulating plug housing;

[0188] The insulating plug housing contains a conductive component, which includes a conductive base, an elastic conductive connecting section, and two conductive contacts. The conductive contacts protrude from the conductive base via the elastic conductive connecting section, allowing them to adaptively conform to the aluminum foil layer. The conductive contacts have an arbitrary breakdown structure shape.

[0189] The insulating insert housing is detachably embedded in the preset installation position of the capacitive bushing; the insulating insert housing has an opening, which allows the conductive contacts to pass through the insulating insert housing and abut against different layers of aluminum foil inside the capacitive bushing, so as to construct an adjustable insulation breakdown defect channel between the capacitive bushing screens.

[0190] The side wall of the insulating plug housing is provided with a slot positioning component, and the slot positioning component has a first threaded hole; the side wall of the capacitor sleeve has a shallow groove that matches the slot positioning component, and a second threaded hole is provided in the shallow groove; when the insulating plug housing is inserted into the groove, the slot positioning key engages inside the shallow groove and is locked and fixed by screws passing through the first threaded hole and the second threaded hole, which restricts the radial and axial movement of the insulating plug housing and achieves a stable overall installation.

[0191] The insulating insert housing has a guide hole on the side opposite to the aluminum foil layer. The insulating push rod passes through the guide hole and is detachably connected to the conductive base. The insulating push rod slides axially along the guide hole to drive the conductive base to extend or retract the conductive contact, thereby controlling the contact and separation of the conductive contact from the aluminum foil layer. A damping ring layer is provided on the inner edge of the guide hole or the outer wall of the insulating push rod.

[0192] This embodiment also provides a method for simulating defects between capacitive bushing screens, which uses the multi-condition integrated capacitive bushing screen defect simulation device of this embodiment for simulation, and includes the following steps:

[0193] Step S1: Create a groove with a stepped bottom structure in the preset test area of ​​the capacitor core of the capacitor sleeve, expose at least two layers of target aluminum foil by means of the stepped groove, and clean the inner wall of the groove and the contact surface of the aluminum foil layer.

[0194] Step S2: Select the conductive contact with the corresponding shape according to the requirements of the breakdown defect test, assemble it into the conductive base to complete the assembly of the conductive component; align the insulating plug housing with the groove and insert it, so that the stepped boss and the groove are completely fitted, the slot positioning piece is inserted into the shallow groove, and the screw is inserted to lock and fix the insulating plug housing.

[0195] Step S3: Slowly push the insulating push rod. The damping ring increases the sliding friction of the push rod, enabling stepless fine adjustment of the conductive contact feed amount and precise control of the contact pressure and contact gap between the contact and the aluminum foil layer. After adjusting to the target contact position, the damping ring temporarily limits the position based on its frictional resistance, and conducts multiple sets of comparative tests on inter-screen insulation defects under fine spacing gradients.

[0196] Step S4: After the test, apply external force to pull the insulating push rod to detach the conductive contact from the aluminum foil layer.

[0197] Example 13

[0198] This embodiment provides a multi-condition integrated capacitive bushing screen defect simulation device, including an insulating plug housing;

[0199] The insulating plug housing contains a conductive component, which includes a conductive base, an elastic conductive connecting section, and two conductive contacts. The conductive contacts protrude from the conductive base via the elastic conductive connecting section, allowing them to adaptively conform to the aluminum foil layer. The conductive contacts have an arbitrary breakdown structure shape.

[0200] The insulating insert housing is detachably embedded in the preset installation position of the capacitive bushing; the insulating insert housing has an opening, which allows the conductive contacts to pass through the insulating insert housing and abut against different layers of aluminum foil inside the capacitive bushing, so as to construct an adjustable insulation breakdown defect channel between the capacitive bushing screens.

[0201] The insulating insert housing has a guide hole on the side opposite to the aluminum foil layer. The insulating push rod passes through the guide hole and is detachably connected to the conductive base. The insulating push rod slides axially along the guide hole to drive the conductive base to extend or retract the conductive contact, thereby controlling the contact and separation of the conductive contact from the aluminum foil layer. A damping ring layer is provided on the inner edge of the guide hole or the outer wall of the insulating push rod.

[0202] It includes three sets of conductive components and three sets of booster components, with each conductive component and booster component being configured in a one-to-one correspondence; the first conductive component includes a first conductive base and a copper guide rod; the second conductive component includes a second conductive base and a rectangular copper foil; the third conductive component includes a third conductive base and a multi-strand diverging fine copper wire structure.

[0203] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to examples, those skilled in the art can still modify the technical solutions described in the foregoing examples or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-condition integrated capacitive bushing screen defect simulation device, characterized in that, Including the housing of the insulating insert; The insulating plug housing is equipped with a conductive component, which includes a conductive base and at least two conductive contacts protruding from the conductive base. The conductive contacts have an arbitrary breakdown structure shape. The insulating insert housing is detachably embedded in a preset installation position of the capacitive bushing; the insulating insert housing has an opening, which allows the conductive contacts to pass through the insulating insert housing and abut against different layers of aluminum foil inside the capacitive bushing, so as to construct an adjustable insulation breakdown defect channel between the capacitive bushing screens.

2. The multi-condition integrated capacitive bushing screen defect simulation device according to claim 1, characterized in that: The preset installation position is a groove opened on the side wall of the capacitor bushing, the bottom of the groove has a stepped structure and exposes at least two layers of aluminum foil of the capacitor bushing. The outer wall of the insulating plug housing on the side with the opening is provided with a stepped boss, which is adapted to the groove.

3. The multi-condition integrated capacitive bushing screen defect simulation device according to claim 1, characterized in that, Including booster components; The booster includes an insulating push rod. The insulating plug housing has a guide hole on the side opposite to the aluminum foil layer. The insulating push rod passes through the guide hole and is detachably connected to the conductive base. The insulating push rod slides axially along the guide hole to drive the conductive base to extend or retract the conductive contact.

4. The multi-condition integrated capacitive bushing screen defect simulation device according to claim 3, characterized in that: The outer wall of the insulating plug housing opposite to the aluminum foil layer is provided with a positioning component, the positioning component including a positioning base installed on the insulating plug housing and a positioning baffle installed on the positioning base; The end of the insulating push rod away from the conductive base is equipped with a circumferentially rotatable locking sleeve. The outer wall of the locking sleeve is provided with a limiting tab. The limiting tab can rotate circumferentially with the locking sleeve to engage or disengage from the limiting area of ​​the positioning baffle.

5. The multi-condition integrated capacitive bushing screen defect simulation device according to claim 3, characterized in that, A damping ring layer is provided on the inner edge of the guide hole or the outer wall of the insulating push rod.

6. The multi-condition integrated capacitive bushing screen defect simulation device according to claim 4 or 5, characterized in that: The conductive component is further provided with an elastic conductive connection section, which is disposed between the conductive base and the conductive contact, so that the conductive contact can adaptively fit the aluminum foil layer.

7. The multi-condition integrated capacitive bushing screen defect simulation device according to claim 3, characterized in that, It includes three sets of the aforementioned conductive components and three sets of the aforementioned booster components, with each conductive component and booster component being configured in a one-to-one correspondence; The first conductive component includes a first conductive base and a copper conductor rod; the second conductive component includes a second conductive base and a rectangular copper foil; the third conductive component includes a third conductive base and a multi-strand diverging fine copper wire structure.

8. The multi-condition integrated capacitive bushing screen defect simulation device according to claim 3, characterized in that: A water-retaining sponge is provided inside the insulating plug housing on the side near the aluminum foil layer. A slow-release hole is opened on the side of the insulating plug housing near the aluminum foil layer corresponding to the water-retaining sponge. A guide hole is opened on the side of the insulating plug housing away from the aluminum foil layer corresponding to the water-retaining sponge, and the insulating push rod passes through the guide hole.

9. The multi-condition integrated capacitive bushing screen defect simulation device according to claim 1, characterized in that: The insulating plug housing has a slot positioning component protruding from its side wall, and the slot positioning component has a first threaded hole; the recessed side wall of the capacitor sleeve has a shallow groove that matches the slot positioning component, and a second threaded hole is formed in the shallow groove. The sleeve is fixed by a screw passing through the first threaded hole and the second threaded hole.

10. A method for simulating defects between capacitive bushing screens, characterized in that, The simulation is performed using the multi-condition integrated capacitive bushing screen defect simulation device according to any one of claims 1 to 9, comprising the following steps: Step S1: Disassemble the capacitor core of the capacitor sleeve to completely expose the target aluminum foil layer. Step S2: Select conductive contacts with corresponding shapes according to preset test conditions, and detachably embed and fix the insulating plug housing to the preset installation position of the capacitive sleeve, so that the conductive contacts abut against different aluminum foil layers respectively.

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