10kv high-voltage metering combined transformer

Abstract

The application relates to the technical field of high-voltage mutual inductors, in particular to a 10kV high-voltage metering combined mutual inductor which comprises a shell and a mounting seat mounted at the bottom of the shell, the outer side of the iron core is provided with a second cast epoxy resin, the second heat conduction assembly comprises symmetrical heat dissipation bases mounted at the outer side of the shell, annular heat dissipation fins are fixedly installed at the middle part of the outer side of the heat dissipation base, and arc-shaped heat dissipation fins are symmetrically installed at the outer side of the annular heat dissipation fins; the application has the beneficial effect that the first heat conduction assembly and the second heat conduction assembly are arranged to form a temperature-triggered mechanical execution system; when the internal temperature rise reaches a threshold value, the system is automatically activated to push the heat conduction ring fins to expand, the heat conduction fins to rotate and adhere to the wall and the external heat dissipation base to be locked, so that a low-thermal-resistance auxiliary heat conduction channel is dynamically established between the internal high-temperature area and the external high-efficiency heat radiator; the inherent heat conduction bottleneck of the epoxy resin is fundamentally broken through.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-voltage mutual inductor, in particular to a 10kV high-voltage metering combined mutual inductor. BACKGROUND

[0002] The 10kV high-voltage metering combined mutual inductor is a key equipment of the intelligent power grid electric energy metering and protection system, and the long-term operation precision and reliability thereof directly affect the fairness of trade settlement and the correct action of power grid protection; at present, the epoxy resin casting dry insulation combined mutual inductor is widely used in indoor and outdoor box transformers, and this structure has become the market mainstream due to its advantages of maintenance-free, oil-free environmental protection, fire prevention and explosion prevention.

[0003] However, this process of one-time casting and sealing of all core components such as primary conductor, core and winding in epoxy resin brings excellent insulation performance, but also introduces a long-term core contradiction that has plagued the industry: the serious heat dissipation problem caused by the sealing structure; as an excellent insulator, the thermal conductivity of epoxy resin is extremely low, like wrapping the internal heat source with a thick "thermal insulation layer"; in operation, the joule heat generated by the primary conductor through the load current and the heat generated by the core magnetic hysteresis eddy current loss are tightly trapped inside the casting body and can only be dissipated outward through extremely slow heat conduction, resulting in a significant radial temperature gradient inside the casting body, forming a "local hot spot" that is difficult to eliminate, especially in the area where the primary conductor and the core are in contact; this persistent internal overheating can trigger a series of chain degradation effects: high temperature can accelerate the aging process of organic insulating materials such as epoxy resin, leading to a decrease in mechanical strength and deterioration of electrical performance, and long-term effects may induce partial discharge or even insulation breakdown, seriously threatening the service life and operation safety of the equipment; the existing technology is mostly passive optimization from materials and external structure; for example, selecting a higher thermal conductivity epoxy resin formula, adding aluminum oxide or other thermal conductive fillers in the casting body, optimizing the shell design to increase the number of heat dissipation fins to increase the heat dissipation area, or coating the shell with a high-emissivity coating to enhance radiation heat dissipation; these methods reduce the overall temperature rise to some extent, but they do not fundamentally solve the problem of heat transfer from the internal core heat source to the shell, and cannot effectively eliminate the local hot spot.

[0004] Therefore, we improve it and propose a 10kV high-voltage metering combined mutual inductor. SUMMARY

[0005] The present application relates to the technical field of high-voltage mutual inductor, in particular to a 10kV high-voltage metering combined mutual inductor.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0007] The utility model provides a heat dissipation device, including the shell and the mounting seat installed in the bottom of shell, the middle part of shell inner chamber is prearranged with primary conductor, and the outside of primary conductor is equipped with the heat conduction paste, and the outside of heat conduction paste is equipped with the insulating sleeve, and the outside of insulating sleeve is equipped with the iron core, the upper and lower ends of iron core are all provided with first heat conduction component, the left and right sides of iron core are symmetrically installed with the second heat conduction component that penetrates to the outside of shell, the outside of iron core is equipped with the second epoxy resin of pouring forming, and the second heat conduction component includes the heat dissipation base that is symmetrically installed in the outside of shell, the middle part of heat dissipation base outside is fixedly installed with annular fin, and the outside of annular fin is symmetrically installed with arc fin.

[0008] As the preferred technical scheme of the present application, a third sleeve shaft is fixedly installed at the center of the side of the heat dissipation base away from the annular fin, the third sleeve shaft extends through the shell to the inside thereof, a hexagonal groove is formed through the inside of the third sleeve shaft, a hexagonal column is sleeved on the third sleeve shaft through the hexagonal groove, and a fourth telescopic shaft is fixedly installed at the other end of the hexagonal column.

[0009] As the preferred technical scheme of the present application, a third telescopic shaft is fixedly installed at the other end of the fourth telescopic shaft, a second return spring is fixedly installed at the other end of the third telescopic shaft, a mounting shaft is sleeved on the outside of the third telescopic shaft, and the other end of the mounting shaft is fixedly connected to the outside of the iron core. The second return spring is arranged to limit the third telescopic shaft, and the third telescopic shaft can be reset after moving.

[0010] As the preferred technical scheme of the present application, a third telescopic shaft is fixedly installed at the other end of the fourth telescopic shaft, a second return spring is fixedly installed at the other end of the third telescopic shaft, a mounting shaft is sleeved on the outside of the third telescopic shaft, and the other end of the mounting shaft is fixedly connected to the outside of the iron core. The second return spring is arranged to limit the third telescopic shaft, and the third telescopic shaft can be reset after moving.

[0011] As the preferred technical scheme of the present application, two groups of the driving shafts are arranged obliquely, and the driving shafts extend through the clamping grooves to the two ends of the mounting shaft, respectively, and the outside of the driving shafts is in contact with the end of the sliding shaft.

[0012] As the preferred technical scheme of the present application, the outer side of the mounting ring plate is hingedly connected with guide rods arranged obliquely, the other end of the guide rod is slidingly sleeved with a rotating shaft arranged obliquely, the end of the rotating shaft close to each other is rotatably connected with an end shaft, the inside of the end shaft is penetratingly provided with a mounting groove, the mounting groove is communicated with the inner cavity of the mounting shaft, the end shaft is fixedly connected with the mounting shaft close to the one end of the fourth telescopic shaft, the outer side of the rotating shaft is fixedly provided with a heat conduction sheet, and the outer side of the rotating shaft is in contact with the inner side of the fourth telescopic shaft.

[0013] As the preferred technical scheme of the present application, the first heat conduction assembly comprises first sleeve shafts uniformly distributed on the upper and lower ends of the iron core, the first sleeve shafts are annular, and the upper and lower ends of the iron core are penetratingly provided with sleeve grooves communicated with the inner side of the first sleeve shaft.

[0014] As the preferred technical scheme of the present application, the inside of the first sleeve shaft is sealingly sleeved with a first telescopic shaft, the bottom of the first telescopic shaft is fixedly provided with a first return spring fixedly connected with the outer side of the insulating sleeve, and the top of the outer side of the adjacent two groups of first telescopic shafts is fixedly provided with arc-shaped heat conduction ring sheets.

[0015] Compared with the prior art, the present application has the following beneficial effects:

[0016] 1. By arranging the first heat conduction assembly and the second heat conduction assembly, a temperature-triggered mechanical execution system is formed; when the internal temperature rises to a threshold value, the system is automatically activated to push the heat conduction ring sheet to expand, the heat conduction sheet to rotate and adhere to the wall and the external heat dissipation base to be locked, thereby dynamically establishing a low-thermal-resistance auxiliary heat conduction channel between the internal high-temperature area and the external high-efficiency heat sink; the inherent heat conduction bottleneck of the epoxy resin is fundamentally broken, and the intelligentization and significant improvement of the heat dissipation efficiency are realized.

[0017] 2. The first heat conduction assembly directly acts on the end of the iron core through air expansion and bimetallic deformation, and the axial heat dissipation is strengthened; the second heat conduction assembly directly guides the heat from the iron core to the shell 1 and connects the external reinforced heat dissipation fins through a complex linkage mechanism; through multi-path and directional heat dissipation, the internal temperature field can be quickly balanced, the temperature of the most dangerous area can be greatly reduced, the aging and carbonization process of the epoxy resin caused by long-term overheating can be effectively delayed, the insulation deterioration and partial discharge risk can be fundamentally reduced, and the service life of the equipment can be prolonged; at the same time, the stable low-temperature operating environment ensures the stability of the magnetic performance of the current transformer iron core, avoids the magnetic property drift caused by temperature fluctuation, guarantees the long-term stability of the ratio error and the angle error, and enables the transformer to continuously meet the harsh requirements of high-precision measurement.

[0018] 3. In normal state, the internal heat conduction mechanism and the third set of shafts through the shell are in a separated state, ensuring sufficient electrical insulation distance; only when overheating needs to be strengthened, physical contact and clamping are realized through mechanical action, and at this time the heat conduction path is established. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0020] Figure 2 It is a sectional view of the internal structure of the present application;

[0021] Figure 3 It is a sectional view of the internal structure of the second epoxy resin of the present application;

[0022] Figure 4 It is a sectional view of the internal structure of the iron core of the present application;

[0023] Figure 5 It is a schematic diagram of the connection structure of the outer side of the iron core of the present application;

[0024] Figure 6 It is a schematic diagram of the connection structure of the mounting shaft of the present application;

[0025] Figure 7 It is an exploded view of the connection structure of the mounting shaft and the second telescopic shaft of the present application;

[0026] Figure 8 It is a schematic diagram of the connection structure of the guide rod of the present application;

[0027] Figure 9 It is a schematic diagram of the connection structure of the guide rod and the rotating shaft of the present application.

[0028] In the drawings, the components represented by each reference numeral are listed as follows:

[0029] 1. shell; 2. mounting seat; 3. first epoxy resin; 4. second epoxy resin; 5. iron core; 6. insulating sleeve; 7. heat conduction paste; 8. primary conductor; 9. first set of shafts; 10. first telescopic shaft; 11. heat conduction ring piece; 12. first return spring; 13. sleeving groove; 14. fixed shaft; 15. drive shaft; 16. second set of shafts; 17. second telescopic shaft; 18. clamping groove; 19. bimetallic strip; 20. mounting shaft; 21. sliding shaft; 22. mounting ring plate; 23. guide rod; 24. rotating shaft; 25. heat conduction piece; 26. end shaft; 27. mounting groove; 28. third telescopic shaft; 29. second return spring; 30. fourth telescopic shaft; 31. hexagonal column; 32. third set of shafts; 33. hexagonal groove; 34. heat dissipation base; 35. arc-shaped heat dissipation fin; 36. annular heat dissipation fin. DETAILED DESCRIPTION

[0030] Clearly, the embodiments described are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0031] The present application provides a technical solution: as shown in Figure 1 - Figure 9 The 10kV high-voltage metering combined transformer shown in the figure comprises a shell 1, a mounting seat 2 mounted at the bottom of the shell 1, a primary conductor 8 pre-set in the middle of the inner cavity of the shell 1, a heat-conducting paste 7 sleeved outside the primary conductor 8, an insulating sleeve 6 sleeved outside the heat-conducting paste 7, an iron core 5 sleeved outside the insulating sleeve 6, first heat-conducting assemblies symmetrically arranged at the upper and lower ends of the iron core 5, second heat-conducting assemblies symmetrically mounted at the left and right sides of the iron core 5 and penetrating to the outside of the shell 1, a second epoxy resin 4 in cast form sleeved outside the iron core 5, the second heat-conducting assembly comprising a heat dissipation base 34 symmetrically mounted outside the shell 1, an annular heat sink 36 fixedly mounted at the middle of the outside of the heat dissipation base 34, and arc-shaped heat sinks 35 symmetrically mounted outside the annular heat sink 36, the heat dissipation base 34 and the annular heat sink 36 and the arc-shaped heat sinks 35 outside the heat dissipation base 34 being arranged to radiate and conduct heat away from the shell 1 and the inner cavity of the shell 1, the annular heat sink 36 and the arc-shaped heat sinks 35 facilitating the formation of convection, thereby facilitating the acceleration of the heat dissipation rate, the insulating sleeve 6 and the heat-conducting paste 7 being arranged to form a temperature equalizing ring, achieving heat conduction while also achieving electrical isolation.

[0032] As shown in Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 and Figure 9 , a third sleeve shaft 32 is fixedly mounted at the center of the side of the heat dissipation base 34 away from the annular heat sink 36, the third sleeve shaft 32 extending to the inside of the shell 1, a hexagonal groove 33 being formed through the inside of the third sleeve shaft 32, the third sleeve shaft 32 being sleeved with a hexagonal column 31 through the hexagonal groove 33, the other end of the hexagonal column 31 being fixedly mounted with a fourth telescopic shaft 30.

[0033] Further, the other end of the fourth telescopic shaft 30 is fixedly installed with a third telescopic shaft 28, and the other end of the third telescopic shaft 28 is fixedly installed with a second reset spring 29, and the outer side of the third telescopic shaft 28 is sleeved with a mounting shaft 20, and the other end of the mounting shaft 20 is fixedly connected with the outer side of the iron core 5, and the second reset spring 29 is arranged to limit the third telescopic shaft 28, and the third telescopic shaft 28 can be reset after moving.

[0034] Further, the middle part of the outer side of the mounting shaft 20 is sleeved with a sliding shaft 21, and the end of the sliding shaft 21 close to the heat dissipation base 34 is fixedly installed with a mounting ring plate 22, and the left and right sides of the mounting shaft 20 are both spacedly provided with a second sleeve shaft 16 and a fixed shaft 14, and the end of the fixed shaft 14 away from the iron core 5 is rotatably sleeved with a driving shaft 15, and the inside of the second sleeve shaft 16 is sleeved with an outwardly extending driving shaft 15, and the inner cavity of the second sleeve shaft 16 is arrayed with a bimetallic strip 19 fixedly connected with the end of a second telescopic shaft 17, and the other end of the second telescopic shaft 17 is provided with an inwardly extending clamping groove 18.

[0035] Further, the two groups of driving shafts 15 are obliquely arranged, and the driving shafts 15 extend to the two ends of the mounting shaft 20 through the clamping grooves 18 respectively, and the outer side of the driving shaft 15 is in contact with the end of the sliding shaft 21;

[0036] When the temperature inside the shell 1 continuously rises, the high temperature continuously conducts to the inside of the second sleeve shaft 16, at this time, the high temperature continuously heats the bimetallic strip 19, and the bimetallic strip 19 is bent, so as to push the second telescopic shaft 17 fixedly connected therewith to move, and the moving second telescopic shaft 17 pushes the obliquely arranged driving shaft 15 to rotate around the end of the fixed shaft 14 in cooperation with the clamping groove 18, and then pushes the sliding shaft 21 in contact therewith to slide along the mounting shaft 20.

[0037] Further, the outer side of the mounting ring plate 22 is arrayed with obliquely arranged guide rods 23, the other end of the guide rod 23 is sleeved with an obliquely arranged rotating shaft 24, the ends of the rotating shafts 24 close to each other are rotatably connected with an end shaft 26, the inside of the end shaft 26 is provided with a mounting groove 27, and the mounting groove 27 is communicated with the inner cavity of the mounting shaft 20, the end of the end shaft 26 close to the fourth telescopic shaft 30 is fixedly connected with the mounting shaft 20, the outer side of the rotating shaft 24 is fixedly installed with a heat conduction piece 25, and the outer side of the rotating shaft 24 is in contact with the inner side of the fourth telescopic shaft 30;

[0038] In use, when the sliding shaft 21 slides under the push of the driving shaft 15, the mounting ring plate 22 is pushed to push the guide rod 23 to move obliquely, and the rotating shaft 24 and the heat-conducting sheet 25 are pushed to rotate under the limiting of the end shaft 26, so that the heat-conducting sheet 25 is in constant contact with the inner side of the shell 1, thereby realizing adaptive heat conduction rate, and the shielding layer embedded in the inner side of the heat-conducting sheet 25 can increase the anti-interference strength of the transformer, and when the rotating shaft 24 rotates, the fourth telescopic shaft 30 is pushed to move, and the third telescopic shaft 28 and the hexagonal column 31 are simultaneously driven to move to the inside of the hexagonal groove 33 and are clamped with the third sleeve shaft 32, so as to improve the heat conduction efficiency by contact, and the arc-shaped heat-dissipating sheet 35 and the annular heat-dissipating sheet 36 are combined to strengthen heat dissipation.

[0039] The first heat-conducting assembly directly acts on the end of the iron core 5 through air expansion and bimetallic deformation to strengthen axial heat dissipation; the second heat-conducting assembly directly guides heat from the iron core 5 to the shell 1 and connects external heat-dissipating fins through a complex linkage mechanism; through multi-path and directional heat dissipation, the internal temperature field can be quickly balanced, the temperature of the most dangerous area can be greatly reduced, the aging and carbonization process of the epoxy resin caused by long-term overheating can be effectively delayed, the insulation deterioration and partial discharge risk can be fundamentally reduced, and the service life of the equipment can be prolonged; at the same time, the stable low-temperature operating environment ensures the stability of the magnetic properties of the current transformer iron core 5, avoids the magnetic property drift caused by temperature fluctuation, guarantees the long-term stability of the ratio error and the phase error, and enables the transformer to continuously meet the harsh requirements of high-precision measurement.

[0040] As shown in Figure 3 The first heat-conducting assembly includes the first sleeve shaft 9 uniformly distributed on the upper and lower ends of the iron core 5, the first sleeve shaft 9 is annular, and the upper and lower ends of the iron core 5 are penetrated to be provided with sleeve grooves 13 penetrating through the inner side of the first sleeve shaft 9.

[0041] Further, the first sleeve shaft 9 is internally sealed and sleeved with the first telescopic shaft 10, the bottom of the first telescopic shaft 10 is fixedly installed with the first return spring 12 fixedly connected with the outer side of the insulating sleeve 6, and the top of the outer side of the adjacent two groups of first telescopic shafts 10 is fixedly installed with the arc-shaped heat-conducting ring sheet 11.

[0042] In use, as the inner cavity of the shell 1 continuously rises, the high temperature will heat the air in the inside of the first sleeve shaft 9 to expand, thereby pushing the first telescopic shaft 10 to move upward, and the heat-conducting ring sheet 11 is made of bimetallic material, so as to drive the first telescopic shaft 10 to expand outward and pull the heat-conducting ring sheet 11 to fully contact the first epoxy resin 3 by increasing the contact area therebetween, thereby realizing adaptive heat dissipation.

[0043] Working principle: In the initial stage of normal operation, the heat dissipation mode of the device is similar to that of the traditional cast transformer, mainly relying on the passive heat conduction of the epoxy resin matrix; At this time, the first telescopic shaft 10 in the first heat conduction assembly is in the reset state applied by the first reset spring 12, and the heat conduction ring piece 11 at the top keeps the minimum contact area with the inner surface of the first epoxy resin 3 above; At the same time, the second heat conduction assembly is in a static state, the heat conduction piece 25 is closed, and the hexagonal column 31 at the end of the fourth telescopic shaft 30 is in a state of disengagement or shallow contact with the hexagonal groove 33 in the third sleeve shaft 32. The external heat dissipation base 34 and its annular heat dissipation piece 36 and arc heat dissipation piece 35 only work as the conventional auxiliary heat dissipation piece of the shell 1; When the primary conductor 8 generates Joule heat through load current and the core 5 generates magnetic loss heat, the heat is first transmitted to the core 5 and the surrounding second epoxy resin 4 through the heat conduction paste 7 and the insulating sleeve 6; With the extension of operation time or the increase of load, the heat continues to accumulate, causing the internal temperature of the cast body to rise steadily; The rise of temperature first acts on the first heat conduction assembly: the air sealed in the first sleeve shaft 9 expands under heat, generating downward pressure; At the same time, the bimetallic material constituting the heat conduction ring piece 11 begins to produce an outward bending deformation trend due to the difference in thermal expansion coefficient between the upper and lower layers; Under the joint action of the two forces, the first telescopic shaft 10 overcomes the elastic force of the first reset spring 12 and slowly extends upward along the first sleeve shaft 9; It has the following effects: first, the extended first telescopic shaft 10 embeds its metal body deeper into the first epoxy resin 3 above, establishing an additional metal heat conduction path from the upper end surface of the core 5 to the top of the shell 1; Second, the arc heat conduction ring piece 11 fixed at the top of the first telescopic shaft 10 changes its arc curvature under the driving of the deformation of the bimetallic piece 19, and expands outward, thereby significantly increasing the contact area with the surrounding first epoxy resin 3; This process realizes the preliminary reinforcement of axial auxiliary heat dissipation from the upper and lower end surfaces of the core 5, and the heat is more efficiently conducted to the top and bottom areas of the device;

[0044] When the device operates in heavy load, high temperature environment or other conditions that cause further aggravation of internal temperature rise, such as harmonic current, the temperature of the primary conductor 8 and the core 5 wrapped area will reach a higher threshold, at which time the second heat conduction assembly is fully activated; The heat is conducted to the mounting shaft 20 fixedly connected with the core 5 and diffused to the surrounding second epoxy resin 4 and the second sleeve shaft 16 mounted thereon; The bimetallic piece 19 arranged in array inside the second sleeve shaft 16 is significantly bent under the continuous high temperature heating; The bending of the bimetallic piece 19 directly drives the second telescopic shaft 17 fixedly connected therewith to move axially; Since the end of the second telescopic shaft 17 is provided with an inclined clamping groove 18, and the clamping groove 18 is provided with a driving shaft 15 rotating around the fixed shaft 14, the linear motion of the second telescopic shaft 17 is converted into the rotary motion of the driving shaft 15 through the inclined surface of the clamping groove 18; Referring to the drawings Figures 1-5As shown, the two sets of symmetrically arranged drive shafts 15 rotate synchronously inward, the shafts pressing the end of the sliding shaft 21 located in the middle of the mounting shaft 20, forcing the sliding shaft 21 to carry the mounting ring plate 22 to slide along the mounting shaft 20 away from the core 5; the displacement of the sliding shaft 21 is the key input of the entire second heat-conducting assembly expansion action; the outer periphery of the mounting ring plate 22 is hinged to the guide rod 23, the other end of the guide rod 23 is slidingly sleeved on the rotating shaft 24; when the mounting ring plate 22 is pushed out, through the linkage action of the guide rod 23, all the rotating shafts 24 are forced to rotate synchronously around the end shaft 26 where they meet on the inside; the heat-conducting fins 25 fixed on the outside of the rotating shaft 24 are thereby rotated and expanded outward from the original folded state, and finally make their outer edges tightly adhere to the inner wall of the shell 1, thereby establishing a radial high-efficiency heat bridge composed of multiple metal heat-conducting fins 25 between the lateral area of the core 5 and the inner wall of the shell 1; at the same time, the movement of the sliding shaft 21 also drives the fourth telescopic shaft 30 and the hexagonal column 31 fixed at the end thereof to move in the direction of the third sleeve shaft 32 through internal linkage; when the internal temperature reaches the preset highest response point, the hexagonal column 31 is completely inserted into the hexagonal groove 33 of the third sleeve shaft 32, forming a stable mechanical interlocking; the external heat dissipation fins greatly increase the heat exchange area with the air, combined with the air convection guided by the arc-shaped heat dissipation fins 35 and the radiation heat dissipation of the annular heat dissipation fins 36, the heat exported from the inside is rapidly dissipated to the surrounding environment; when the internal temperature decreases due to the enhanced heat dissipation, the bimetallic strip 19 deforms to recover, and under the action of the reset elements such as the second reset spring 29, the entire mechanical system sequentially reverses the action: the heat-conducting fins 25 are folded and separated from the inner wall of the shell 1, the hexagonal column 31 is withdrawn from the hexagonal groove 33, and the rigid connection with the external radiator is disconnected, thereby completing a complete self-adaptive heat dissipation cycle.

[0045] It should be noted that the relational terms herein such as first and second and the like are used solely 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 "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0046] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A 10kV high-voltage metering combined transformer, comprising a housing (1) and a mounting base (2) installed at the bottom of the housing (1), characterized in that: A primary conductor (8) is pre-installed in the middle of the inner cavity of the outer shell (1), and a thermal grease (7) is sleeved on the outer side of the primary conductor (8), and an insulating sleeve (6) is sleeved on the outer side of the thermal grease (7), and an iron core (5) is sleeved on the outer side of the insulating sleeve (6). A first thermal conductive component is symmetrically arranged at both the upper and lower ends of the iron core (5), and a second thermal conductive component is symmetrically installed on the left and right sides of the iron core (5) and extends to the outer side of the outer shell (1). A second epoxy resin (4) is cast and molded on the outer side of the iron core (5). The second thermal conductive component includes a heat dissipation base (34) symmetrically installed on the outer side of the outer shell (1). An annular heat dissipation fin (36) is fixedly installed in the middle of the outer side of the heat dissipation base (34), and an arc-shaped heat dissipation fin (35) is symmetrically installed on the outer side of the annular heat dissipation fin (36). A third shaft (32) is fixedly installed at the center of the side of the heat dissipation base (34) away from the annular heat sink (36). A hexagonal groove (33) is provided through the inner side of the third shaft (32). A hexagonal column (31) is sleeved on the third shaft (32) through the hexagonal groove (33). A fourth telescopic shaft (30) is fixedly installed at the other end of the hexagonal column (31). The third telescopic shaft (28) is fixedly installed at the other end of the fourth telescopic shaft (30), and the second return spring (29) is fixedly installed at the other end of the third telescopic shaft (28). The mounting shaft (20) is sleeved on the outside of the third telescopic shaft (28), and the other end of the mounting shaft (20) is fixedly connected to the outside of the iron core (5). A sliding shaft (21) is sleeved in the middle of the outer side of the mounting shaft (20). A mounting ring plate (22) is fixedly installed at one end of the sliding shaft (21) near the heat dissipation base (34). A second set of shafts (16) and a fixed shaft (14) are distributed at intervals on both the left and right sides of the mounting shaft (20). A drive shaft (15) is rotatably sleeved at the end of the fixed shaft (14) away from the iron core (5). An outwardly extending drive shaft (15) is sleeved inside the second set of shafts (16). A bimetallic strip (19) is arranged in the inner cavity of the second set of shafts (16) and is fixedly connected to the end of the second telescopic shaft (17). An inwardly extending slot (18) is opened at the other end of the second telescopic shaft (17). The two sets of drive shafts (15) are inclined and extend through the slot (18) to both ends of the mounting shaft (20), and the outer side of the drive shaft (15) is in contact with the end of the sliding shaft (21); The outer side of the mounting ring plate (22) is hinged with inclined guide rods (23), and the other end of the guide rods (23) is slidably fitted with an inclined rotating shaft (24). The ends of several rotating shafts (24) that are close to each other are rotatably connected to an end shaft (26). The end shaft (26) has a through-hole mounting groove (27), and the mounting groove (27) communicates with the inner cavity of the mounting shaft (20). The end shaft (26) is fixedly connected to the end of the mounting shaft (20) near the fourth telescopic shaft (30). A heat-conducting plate (25) is fixedly installed on the outer side of the rotating shaft (24).

2. A 10kV high-voltage metering combined instrument transformer according to claim 1, characterized in that: The first heat-conducting component includes a first set of shafts (9) evenly distributed at the upper and lower ends of the iron core (5). The first set of shafts (9) is annular, and the upper and lower ends of the iron core (5) are provided with a sleeve groove (13) that communicates with the inner side of the first set of shafts (9).

3. A 10kV high-voltage metering combined instrument transformer according to claim 2, characterized in that: The first set of shafts (9) is internally sealed with a first telescopic shaft (10). The bottom of the first telescopic shaft (10) is fixedly installed with a first return spring (12) that is fixedly connected to the outside of the insulating sleeve (6). The top of the outer side of the two adjacent sets of first telescopic shafts (10) is fixedly installed with an arc-shaped heat-conducting ring plate (11).

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