A 10kV three-element anti-resonance combined mutual inductor for metering

Abstract

The present application relates to the technical field of inductor manufacturing, in particular to a 10kV three-element anti-resonance metering combined mutual inductor, which comprises a mutual inductor main body, a heat dissipation groove is arranged at the bottom of the main body, and an isolation box is arranged inside; the side wall and top of the isolation box are respectively slidably connected with pressure plate one and pressure plate two; isolation plate one, isolation plate two, blocking plate one and blocking plate two are arranged in the box from top to bottom; the present application breaks through the limitation of the fixed heat dissipation mode in traditional inductor manufacturing, and constructs a "stress-heat dissipation" self-adaptive adjustment mechanism: through the pressure plate, the stress generated by the difference in the thermal expansion coefficient of materials such as epoxy resin, copper material and silicon steel sheet is sensed, different numbers of air inlets and air holes are automatically linked to be opened, intelligent switching from basic heat dissipation to intensified heat dissipation is realized, and through the spring buffer system, thermal mechanical stress is absorbed in all directions, the long-term reliability problem of internal cracks and insulation deterioration caused by material thermal mismatch in inductor manufacturing is solved, and the product life and operation stability are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of inductor manufacturing, in particular to a 10kV three-element anti-resonance combined transformer for metering. BACKGROUND

[0002] The 10kV three-element anti-resonance combined transformer for metering is a key comprehensive measuring device in a power system, which integrates the functions of three-phase voltage transformers and three-phase current transformers in a unified sealed unit, and is usually formed by epoxy resin casting. The device mainly undertakes core tasks such as electric energy metering, load monitoring and relay protection, and its operation reliability and metering accuracy are directly related to the economic settlement and safety and stability of the power grid. The manufacturing of the 10kV three-element anti-resonance combined transformer for metering belongs to the high-end subdivision field of inductor manufacturing, and the core manufacturing process is epoxy resin casting integrated forming, that is, the copper winding, silicon steel sheet core and other core components of the three-phase voltage / current transformer are packaged into a sealed unit by epoxy resin casting to meet the manufacturing requirements of miniaturization and insulation of the distribution network.

[0003] In the inductor manufacturing process, in order to balance the insulation performance and electromagnetic characteristics, three types of core materials, namely epoxy resin (main insulation), copper material (conductor) and silicon steel sheet (core), must be selected, but the thermal expansion coefficients of the three are significantly different (epoxy resin is about 60-80ppm / ℃, copper is about 17ppm / ℃, and silicon steel sheet is about 11ppm / ℃). In the long-term operation after the completion of the manufacture of the transformer, the temperature cycle caused by load fluctuation will cause periodic thermal stress at the material interface formed during manufacturing, and the traditional inductor manufacturing process lacks targeted heat dissipation and stress buffering design, relying only on the heat dissipation of the epoxy resin itself, which leads to the accumulation of thermal stress and causes interface cracks, ultimately destroying the insulation integrity in the manufacturing process. In the current inductor manufacturing field, the cooling scheme for such combined transformers is mostly fixed heat dissipation groove design, but the heat dissipation efficiency cannot be dynamically adjusted according to the actual temperature distribution in the operation during manufacturing - 'over-heat dissipation' in low-heat working conditions causes condensation in the sealed structure of the manufacturing package, and 'under-heat dissipation' in high-heat working conditions aggravates material stress, and the manufacturing process does not integrate a filter cleaning and contaminant blocking structure, which causes dust to block the heat dissipation channel and reduces the service life of the manufacturing product. SUMMARY

[0004] The present application aims to provide a 10kV three-element anti-resonance combined transformer for metering to solve the problems raised in the background art.

[0005] In order to achieve the above object, the present application provides the following technical scheme: including mutual inductor main body, the bottom of mutual inductor main body is equipped with heat dissipation groove, and the inside of mutual inductor main body is equipped with isolation box that is communicated with heat dissipation groove;The side of isolation box is slidably connected with pressure plate one, and the top of isolation box is slidably connected with pressure plate two;From top to bottom, isolation plate one, isolation plate two, blocking plate one and blocking plate two are sequentially arranged in isolation box, air inlet one, air inlet two and air outlet are arranged on isolation plate one, and air hole one and air hole two are arranged on isolation plate two;Air hole two is equipped with baffle two that controls opening and closing thereof, and baffle three is arranged on air inlet two.

[0006] Further, the isolation plate one is located between pressure plate one and pressure plate two, and the isolation plate two, blocking plate one and blocking plate two are all located below pressure plate two.

[0007] Further, the mounting seat is arranged on mutual inductor main body, spring one is arranged between pressure plate two and isolation plate one, and the bottom surface of pressure plate two is fixedly connected with inserting rod.

[0008] Further, the piston cylinder one matched with inserting rod is arranged below isolation plate one, the piston cylinder two is arranged below isolation plate one, the piston cylinder one and the piston cylinder two are communicated through air pipe, and filter screen is arranged in air inlet one, air inlet two and air outlet.

[0009] Further, the limiting guide groove is arranged below isolation plate one, the fixed frame is slidably connected in limiting guide groove, baffle three is fixedly connected on fixed frame, and cleaning strip one and cleaning strip two are arranged on fixed frame.

[0010] Further, spring four is arranged between baffle three and inner wall of isolation box, piston block is slidably connected in piston cylinder two, cleaning strip two is fixedly connected with piston block, in initial state, baffle three covers air inlet two, and cleaning strip one is located between air inlet one and air inlet two.

[0011] Further, the fixed plate is arranged in isolation box, and spring two is arranged between fixed plate and pressure plate one.

[0012] Further, the pressure plate one is two, one push rod is arranged on each pressure plate one, the limiting pipe is arranged in isolation box, and the end of push rod is inserted into limiting pipe.

[0013] Further, the inserting pipe is communicated in the middle part of limiting pipe, baffle one is slidably connected in inserting pipe, baffle one and baffle two are fixedly connected through sliding rod, fixed seat is arranged on isolation plate two, sliding rod penetrates fixed seat, and spring three is arranged between fixed seat and baffle one.

[0014] Furthermore, the first barrier plate is provided with a first inclined groove, and the second barrier plate is provided with a second inclined groove.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. This invention breaks through the limitations of the traditional fixed heat dissipation mode of current transformers and constructs a "stress-heat dissipation" adaptive adjustment mechanism based on the thermal expansion stress of materials. When the temperature rises in different parts (upper part or both sides) and causes the material to expand, the device can accurately sense the temperature change trend through the displacement of the pressure plate and automatically adjust the number of air intake channels (single opening of air intake one / double opening of air intake one and air intake two, single opening of vent one / double opening of vent one and vent two), realizing intelligent switching between "local low heat - basic heat dissipation" and "local high heat - enhanced heat dissipation", avoiding energy waste caused by "overheating" and temperature accumulation caused by "underheating".

[0017] 2. This invention constructs a multi-dimensional stress buffering system through a "spring-pressure plate" combined structure: the second pressure plate, in conjunction with the first spring, buffers the axial stress generated by the expansion of the upper material; the first pressure plate, in conjunction with the second spring, buffers the radial stress generated by the expansion of the side material; the third and fourth springs provide restoring elasticity to the first baffle and the fixed frame, respectively, while further absorbing the impact stress during movement. This system can comprehensively absorb the periodic mechanical stress generated by the thermal cycle of the material, avoiding stress concentration that leads to cracks at the interface between the epoxy resin casting and the metal material, thus solving the insulation failure problem caused by the difference in thermal expansion of materials in traditional current transformers. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 ;

[0020] Figure 3 This is a cross-sectional view of the main body of the current transformer of the present invention;

[0021] Figure 4 This is a schematic diagram of the isolation box of the present invention;

[0022] Figure 5 Cross-sectional view of the isolation box of the present invention Figure 1 ;

[0023] Figure 6 For the present invention Figure 5 Enlarged structural diagram of section A;

[0024] Figure 7 Cross-sectional view of the isolation box of the present invention Figure 2 ;

[0025] Figure 8 For the structure of the application Figure 7 enlarged view of part B;

[0026] Figure 9 For the sectional view of the isolation box of the application Figure 3 ;

[0027] Figure 10 For the structure of the application Figure 9 enlarged view of part C.

[0028] In the drawings, the components represented by each reference numeral are listed as follows: 1, mutual inductor main body; 2, mounting seat; 3, heat dissipation groove; 4, isolation box; 5, pressure receiving plate one; 501, push rod; 6, pressure receiving plate two; 7, limiting tube; 701, plug-in tube; 8, isolation plate one; 801, air inlet one; 802, air inlet two; 803, air outlet; 9, plug rod; 10, spring one; 11, fixed plate; 12, spring two; 13, baffle one; 14, sliding rod; 15, air hole one; 16, spring three; 17, fixed seat; 18, baffle two; 19, air hole two; 20, isolation plate two; 21, blocking plate one; 2101, inclined groove one; 22, blocking plate two; 2201, inclined groove two; 23, filter screen; 24, piston cylinder one; 25, air pipe; 26, piston cylinder two; 27, piston block; 28, baffle three; 29, cleaning bar one; 30, cleaning bar two; 31, spring four; 32, limiting guide groove; 33, fixed frame. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0030] The application provides a technical solution: as Figures 1-10The utility model provides an illustrated 10kV three element anti -resonance measurement combined mutual -inductor, including mutual -inductor main part 1, the bottom of mutual -inductor main part 1 is equipped with heat dissipation groove 3, be equipped with the isolation box 4 of communication with heat dissipation groove 3 in mutual -inductor main part 1, the side surface of isolation box 4 is slidably connected with pressure plate one 5, and the top of isolation box 4 is slidably connected with pressure plate two 6, and isolation box 4 is equipped with isolation plate one 8, isolation plate two 20, barrier plate one 21, barrier plate two 22 from top to bottom in sequence, and isolation plate one 8 is equipped with air inlet one 801, air inlet two 802, exhaust port 803, and isolation plate two 20 is equipped with air hole one 15 and air hole two 19, and air hole two 19 is equipped with baffle two 18 for controlling its opening and closing, and air inlet two 802 is equipped with baffle three 28.

[0031] Isolation plate one 8 is located between pressure plate one 5 and pressure plate two 6, and isolation plate two 20, barrier plate one 21 and barrier plate two 22 are all located below pressure plate one 5, and the installation seat 2 is equipped on mutual -inductor main part 1, spring one 10 is arranged between pressure plate two 6 and isolation plate one 8, the bottom surface of pressure plate two 6 is fixedly connected with the plug rod 9, the lower portion of isolation plate one 8 is equipped with the piston cylinder one 24 matched with the plug rod 9, the lower portion of isolation plate one 8 is equipped with the piston cylinder two 26, the piston cylinder one 24 and the piston cylinder two 26 are communicated by the air pipe 25, the filter screen 23 is arranged in air inlet one 801, air inlet two 802 and exhaust port 803, the lower portion of isolation plate one 8 is equipped with the limit guide slot 32, the fixed frame 33 is slidably connected in the limit guide slot 32, the baffle three 28 is fixedly connected on the fixed frame 33, the fixed frame 33 is equipped with the cleaning strip one 29 and the cleaning strip two 30, the spring four 31 is arranged between the baffle three 28 and the inner wall of isolation box 4, the piston block 27 is slidably connected in the piston cylinder two 26, the cleaning strip two 30 is fixedly connected with the piston block 27, in the initial state, the baffle three 28 covers air inlet two 802, the cleaning strip one 29 is located between air inlet one 801 and air inlet two 802, the fixed plate 11 is arranged in isolation box 4, and the spring two 12 is arranged between the fixed plate 11 and pressure plate one 5, pressure plate one 5 is equipped with two, and one push rod 501 is arranged on each pressure plate one 5, the limit pipe 7 is arranged in isolation box 4, the end of the push rod 501 is inserted into the limit pipe 7, the limit pipe 7 is communicated with the plug-in pipe 701 in the middle part, the baffle one 13 is slidably connected in the plug-in pipe 701, the baffle one 13 is fixedly connected with the baffle two 18 through the sliding rod 14, the fixed seat 17 is arranged on isolation plate two 20, the sliding rod 14 penetrates the fixed seat 17, the spring three 16 is arranged between the fixed seat 17 and the baffle one 13, the inclined slot one 2101 is arranged on barrier plate one 21, and the inclined slot two 2201 is arranged on barrier plate two 22.

[0032] In this invention, the isolation box 4 serves as the core functional component. Through the longitudinal separation of the isolation plate 8 and the isolation plate 20, it forms three independent and functionally coordinated spatial structures, which are the upper space, the middle space and the lower space from top to bottom. The upper space contains a rod 9, a pressure plate 2 6, and a spring 10. The pressure plate 2 6 is elastically connected to the top surface of the isolation plate 8 via the spring 10. The rod 9 is vertically fixed to the bottom surface of the pressure plate 2 6 and is coaxially aligned with the piston cylinder 24 below the isolation plate 8. The middle space is the core action execution area, integrating key components such as piston cylinder 24, piston cylinder 2 26, air pipe 25, limiting pipe 7, insertion pipe 701, baffle 1 13, sliding rod 14, fixed seat 17, spring 3 16, baffle 2 18, limiting guide groove 32, fixed frame 33, baffle 3 28, cleaning strip 1 29, cleaning strip 2 30, and spring 4 31. Piston cylinder 1 24 and piston cylinder 2 26 are connected by air pipe 25. The fixed frame 33 is slidably embedded in the limiting guide groove 32. 3. Cleaning strip 28, cleaning strip 29, and cleaning strip 20 are all fixed on the fixed frame 33. The end of cleaning strip 20 is rigidly connected to the piston block 27 inside the piston cylinder 26. The limiting tube 7 is horizontally fixed in the middle space. Its two ends are respectively inserted into the push rods 501 of the two pressure plates 5. The middle part is connected to the baffle 13 through the insertion tube 701. The baffle 13 is fixed to the baffle 28 inside the vent hole 29 by the sliding rod 14. The sliding rod 14 passes through the fixed seat 17, and the fixed seat 17 and the baffle 13 are elastically reset by the spring 316. The lower space is only provided with the barrier plate 21 and the barrier plate 22, which are arranged in parallel and spaced apart. The inclined groove 2101 on the barrier plate 21 and the inclined groove 2201 on the barrier plate 22 are opened in opposite directions to form a reverse barrier structure.

[0033] The isolation box 4 is made of epoxy resin material that is the same as the main body 1 of the current transformer. Its inner wall limiting guide groove 32, piston cylinder and other structures are integrally formed by mold, which is compatible with the casting process of the inductor manufacturing and avoids sealing failure caused by secondary assembly. The pressure plate 5 and the pressure plate 6 are made of copper alloy. Their thermal conductivity is matched with the copper material of the current transformer winding. They can accurately sense the thermal expansion and deformation of the manufacturing material and assist in conducting heat to the heat dissipation channel.

[0034] In the initial state, the spring 10 is in a natural state of extension, the pressure plate 6 protrudes from the top of the isolation box 4, the plug rod 9 is not inserted into the piston cylinder 24; the spring 4 31 is in a natural state of extension, the fixed frame 33 drives the baffle 3 28 to cover the air inlet 2 802, only the air inlet 1 801 remains open, the cleaning bar 1 29 is located between the air inlet 1 801 and the air inlet 2 802, and the cleaning bar 2 30 is in the initial position; the spring 2 12 is in a natural state of extension, the two pressure plates 5 protrude from both sides of the isolation box 4, and the push rod 501 is only partially inserted into the limiting tube 7; the spring 3 16 is in a natural state of extension, the baffle 1 13 is located in the initial position in the plug-in tube 701, and the baffle 2 18 covers the air hole 2 19, only the air hole 1 15 remains open. The filter screen 23 in the air inlet 1 801, the air inlet 2 802 and the exhaust port 803 is in a clean state, which ensures smooth airflow.

[0035] Further, when the upper epoxy resin of the inductor package expands due to heat, the copper alloy material of the pressure plate 6 can quickly transfer the expansion stress to push the plug rod 9 to insert into the piston cylinder 1 24. The structure that the piston cylinder 1 24 and the piston cylinder 2 26 are communicated through the air pipe 25 is sealed by brazing during manufacturing, which ensures that the air path is leak-proof and the response accuracy of heat dissipation adjustment is guaranteed; at the same time, the cleaning bar on the fixed frame 33 is made of wear-resistant nylon, which matches the stainless steel material of the filter screen in the inductor manufacturing, can clean the filter screen 23 and avoid scratching, and prolong the service life of the manufacturing components.

[0036] Reference Figures 1-10 The working principle of the present application: based on the stress signal generated by the difference in thermal expansion coefficient of the epoxy resin, copper material and silicon steel sheet in the transformer, the displacement of the pressure plate 2 6 and the pressure plate 1 5 triggers the linkage mechanism, realizes the integrated collaborative work of "stress sensing-heat dissipation regulation-filter screen 23 cleaning-pollution blocking", which is specifically divided into the following three working conditions:

[0037] I. Upper material thermal expansion working condition (corresponding to the increase of upper space temperature)

[0038] When the upper epoxy resin and other materials in the transformer body 1 are heated and expanded due to temperature rise, the expansion pressure will act on the top surface of the pressure plate 2 6. Under the action of pressure, the pressure plate 2 6 overcomes the elastic force of the spring 1 0 and shrinks into the upper space of the isolation box 4, at the same time, the bottom fixed plug rod 9 moves downward synchronously. As the plug rod 9 gradually inserts into the piston cylinder 1 24, it will produce extrusion effect on the gas in the piston cylinder 1 24, so that the gas pressure in the piston cylinder 1 24 rises. Under the push of the pressure difference, the gas in the piston cylinder 1 24 is pressed into the piston cylinder 2 26 through the air pipe 25, which causes the volume of the gas in the piston cylinder 2 26 to increase, and then pushes the piston block 27 to move along the axis direction of the piston cylinder 2 26 away from the air pipe 25.

[0039] The movement of the piston block 27 will drive the synchronous movement of the cleaning strip two 30 fixedly connected thereto, and the cleaning strip two 30 is fixed on the fixed frame 33, so that the fixed frame 33 will slide along the limiting guide groove 32 under the pulling of the cleaning strip two 30, and at the same time, the spring four 31 is in a compressed state by overcoming the elastic force of the spring four 31. During the sliding process of the fixed frame 33, the cleaning strip one 29 and the baffle three 28 on the fixed frame 33 will move synchronously: the cleaning strip one 29 will pass through the filter screen 23 at the air inlet one 801, and the cleaning strip two 30 will pass through the filter screen 23 at the air inlet two 802, so as to remove the dust, impurities and other pollutants attached to the surface of the filter screen 23 through physical friction, and prevent the filter screen 23 from being blocked to cause the ventilation efficiency to be reduced; and the baffle three 28 will gradually move away from the covering position of the air inlet two 802, so that the air inlet two 802 is switched from the closed state to the open state.

[0040] At this time, the air inlet one 801 and the air inlet two 802 are in the open state at the same time, and the external cold air will enter the upper space of the isolation box 4 through the two air inlets at the same time, and be fully mixed with the hot air in the upper space. The mixed hot air is discharged out of the isolation box 4 under the action of the air flow pressure difference through the exhaust port 803, and is finally dissipated to the external environment through the heat dissipation groove 3 at the bottom of the mutual inductor main body 1. Due to the increase in the number of air inlets, the air inlet amount is greatly improved, and the air flow circulation speed is accelerated, so as to realize the rapid cooling of the upper space and the surrounding high-temperature area, relieve the thermal expansion stress of the upper material caused by the excessively high temperature, and reduce the initiation of micro cracks. When the temperature of the upper material decreases and the expansion pressure decreases, the elastic force of the spring one 10 will push the pressure plate two 6 to reset, the insertion rod 9 will exit from the piston cylinder one 24, the air pressure in the piston cylinder one 24 and the piston cylinder two 26 will restore to balance, the elastic force of the spring four 31 will push the fixed frame 33 to reset, the baffle three 28 will cover the air inlet two 802 again, and the cleaning strip one 29 and the cleaning strip two 30 will return to the initial position, so that the device restores to the initial working state.

[0041] II. One-sided side material thermal expansion working condition (corresponding to local temperature rise in the middle space)

[0042] When the material on one side of the mutual inductor main body 1 is thermally expanded due to the local temperature rise, the expansion pressure will act on the side of the pressure plate one 5 on the side. The pressure plate one 5 will contract into the middle space of the isolation box 4 by overcoming the elastic force of the spring two 12, and at the same time, the push rod 501 fixed at the end of the pressure plate one 5 will be inserted into the limiting tube 7 along the axis direction of the limiting tube 7. The push rod 501 will extrude the gas in the limiting tube 7 during the insertion process, but since the pressure plate one 5 on the other side is not affected by the expansion pressure, the corresponding push rod 501 remains in the initial position and does not move, so that the extruded gas in the limiting tube 7 can only flow locally in the limiting tube 7 and cannot form enough pressure to push the baffle one 13.

[0043] Therefore, the baffle 13 remains in the initial position, and the baffle 18 connected to the baffle 13 through the sliding rod 14 also covers the vent hole 19, and the vent hole 19 remains closed. At this time, the middle space of the isolation box 4 only exchanges gas through the vent hole 15 on the isolation plate 20: the outside cold air enters the middle space through the vent hole 15, absorbs the heat in the middle space to form hot air, and the hot air is discharged through the vent hole 15, forming a one-way air circulation to provide basic heat dissipation for the middle space. In this working condition, the device automatically selects a low-power basic heat dissipation mode according to the local temperature rise, avoiding energy waste, and at the same time, through the buffering effect of the spring 12, the local stress generated by unilateral expansion is absorbed to prevent component damage caused by stress concentration. When the unilateral expansion pressure disappears, the spring 12 pushes the pressure plate 5 and the push rod 501 to reset, and the device returns to the initial state.

[0044] III. Both sides of the material are heated and expanded (corresponding to the overall temperature rise in the middle space)

[0045] When the materials on both sides of the transformer body 1 are heated and expanded due to the overall temperature rise, the expansion pressure on both sides will act on the sides of the two pressure plates 5. The two pressure plates 5 will shrink into the middle space of the isolation box 4 under the pressure, and at the same time, the push rods 501 will be inserted into the limiting tube 7. The two push rods 501 will simultaneously extrude the gas in the limiting tube 7, causing the gas pressure in the limiting tube 7 to rise sharply. Under high pressure, the gas in the limiting tube 7 will flow into the plug-in tube 701 in the middle part of the limiting tube 7, forming a pushing force on the baffle 13.

[0046] When the pushing force overcomes the elastic force of the spring 16, the baffle 13 will slide along the axis direction of the plug-in tube 701 (the plug-in tube 701 is perpendicular to the limiting tube 7) to the side away from the limiting tube 7, and at the same time, the sliding rod 14 fixed thereto will move synchronously. The sliding rod 14 will pass through the fixed seat 17 and push the baffle 18 connected at the end to exit from the vent hole 19, so that the vent hole 19 switches from the closed state to the open state. At this time, the vent hole 15 on the isolation plate 20 and the vent hole 19 are both in the open state, and the outside cold air enters the middle space through the two vent holes, and the hot air in the middle space is fully exchanged with the outside cold air. The hot air is quickly discharged through the two vent holes, greatly improving the gas exchange rate and heat dissipation efficiency of the middle space, achieving rapid cooling of the overall high-temperature area in the middle space, and effectively relieving the overall stress caused by the thermal expansion of the materials on both sides.

[0047] When the temperature of the double-sided material decreases and the expansion pressure decreases, the spring 12 will push the two pressure plates 5 and the push rod 501 to reset, the air pressure in the limiting tube 7 decreases, the spring 16 pushes the baffle 13, the sliding rod 14 and the baffle 18 to reset, the baffle 18 covers the vent hole 19 again, and the device returns to the initial working state.

[0048] Four, contaminant blocking mechanism (through all working conditions)

[0049] In all the above working conditions, the blocking plate 21 and the blocking plate 22 in the lower space of the isolation box 4 always play a role in blocking contaminants. Because the direction of the inclined groove 2101 on the blocking plate 21 and the direction of the inclined groove 2201 on the blocking plate 22 are opposite, when dust, water vapor, impurities and other contaminants in the external environment invade the inside of the isolation box 4 along with the airflow or gravity, they will be first blocked by the inclined groove 2201 of the blocking plate 22, and part of the contaminants that are not blocked will continue to move upward, but will be intercepted by the inclined groove 2101 of the blocking plate 21 in the opposite direction, forming a “double reverse blocking” effect. At the same time, the isolation plate 8 and the isolation plate 20 as a transverse separation structure can further block the spread of contaminants to the upper space and the middle space, prevent contaminants from adhering to the surface of the spring, piston, baffle and other moving parts to cause jamming and wear, or adhering to the surface of the filter screen 23 to affect ventilation, so as to ensure the long-term stable operation of the internal components of the device.

[0050] The specific embodiment of the present application aims at the inherent defects in the manufacture of the inductor, and provides a smart management system built in the mutual inductor. The system does not simply increase the heat dissipation area, but creatively converts the destructive factor of “thermal stress” into a “driving signal”, and realizes self-adaptive adjustment of heat dissipation intensity and self-cleaning of the internal filter screen through ingenious mechanical structure design, which represents the technical leap from passive protection to active management in the manufacture of inductors.

[0051] It should be noted that, in the present text, relational terms such as first and second are used merely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms “include”, “contain” or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A 10kV three-element anti-resonance metering combined transformer, comprising a transformer body (1), characterized in that: The bottom of the transformer body (1) is provided with a heat dissipation groove (3), and the transformer body (1) is provided with an isolation box (4) connected to the heat dissipation groove (3). The side of the isolation box (4) is slidably connected to a pressure plate (5), and the top of the isolation box (4) is slidably connected to a pressure plate (6). The isolation box (4) is provided with an isolation plate 1 (8), an isolation plate 2 (20), a barrier plate 1 (21), and a barrier plate 2 (22) from top to bottom. The isolation plate 1 (8) is provided with an air inlet 1 (801), an air inlet 2 (802), and an exhaust port (803). The isolation plate 2 (20) is provided with a ventilation hole 1 (15) and a ventilation hole 2 (19). The second ventilation hole (19) is provided with a baffle (18) to control its opening and closing, and the second air inlet (802) is provided with a baffle (28). The transformer body (1) is provided with a mounting base (2), and a spring (10) is provided between the pressure plate (6) and the isolation plate (8). A plug rod (9) is fixedly connected to the bottom surface of the pressure plate (6). Below the first isolation plate (8) is a piston cylinder (24) that cooperates with the insert rod (9). Below the first isolation plate (8) is a piston cylinder (26). The first piston cylinder (24) and the second piston cylinder (26) are connected by an air pipe (25). The first air inlet (801), the second air inlet (802), and the exhaust port (803) are all equipped with filters (23). The isolation plate 1 (8) is provided with a limiting guide groove (32) below it. A fixed frame (33) is slidably connected in the limiting guide groove (32). The baffle 3 (28) is fixedly connected to the fixed frame (33). The fixed frame (33) is provided with a cleaning strip 1 (29) and a cleaning strip 2 (30). A spring four (31) is provided between the baffle three (28) and the inner wall of the isolation box (4). A piston block (27) is slidably connected inside the piston cylinder two (26). The cleaning strip two (30) is fixedly connected to the piston block (27). In the initial state, the baffle three (28) covers the air inlet two (802), and the cleaning strip one (29) is located between the air inlet one (801) and the air inlet two (802).

2. A 10kV three-element anti-resonance metering combined transformer according to claim 1, characterized in that: The first isolation plate (8) is located between the first pressure plate (5) and the second pressure plate (6), and the second isolation plate (20), the first barrier plate (21), and the second barrier plate (22) are all located below the first pressure plate (5).

3. A 10kV three-element anti-resonance metering combined transformer according to claim 1, characterized in that: The isolation box (4) is provided with a fixing plate (11), and a spring (12) is provided between the fixing plate (11) and the pressure plate (5).

4. A 10kV three-element anti-resonance metering combined transformer according to claim 1, characterized in that: There are two pressure plates (5), and each pressure plate (5) is provided with a push rod (501). The isolation box (4) is provided with a limiting tube (7), and the end of the push rod (501) is inserted into the limiting tube (7).

5. A 10kV three-element anti-resonance metering combined transformer according to claim 4, characterized in that: The middle part of the limiting tube (7) is connected to the insertion tube (701). A baffle (13) is slidably connected inside the insertion tube (701). The baffle (13) and the baffle (18) are fixedly connected by a sliding rod (14). A fixed seat (17) is provided on the isolation plate (20). The sliding rod (14) passes through the fixed seat (17). A spring (16) is provided between the fixed seat (17) and the baffle (13).

6. A 10kV three-element anti-resonance metering combined transformer according to claim 1, characterized in that: The first barrier plate (21) has a first inclined groove (2101), and the second barrier plate (22) has a second inclined groove (2201).

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