High-power three-phase isolated transformer

Abstract

The application discloses a high-power three-phase isolation transformer, and belongs to the technical field of transformers.The high-power three-phase isolation transformer comprises a winding, and upper yoke fixing structures and lower yoke fixing structures are respectively arranged above and below the winding; a limiting assembly is arranged above the upper yoke fixing structures; the limiting assembly comprises a base frame; at least two first limiting rods are horizontally arranged on the side of the base frame; a movable frame capable of moving relative to the first limiting rods is arranged on the first limiting rods; a second limiting rod is vertically arranged at the bottom of the movable frame; a plugboard is connected to the bottom of the second limiting rod; and the plugboard is in contact with the bottom of the winding.The transformer can realize dynamic limiting of the winding of the transformer, adapt to winding installation deviation and thermal expansion and cold contraction changes, and effectively improve the operation stability of the transformer under high-power working conditions.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transformers, in particular to a large-power three-phase isolation transformer. BACKGROUND

[0002] In the scenarios of industrial production, driving of large power equipment, high-voltage power supply system, and new energy grid connection, the large-power three-phase isolation transformer, as a core power transmission and conversion component, plays a key role in realizing electrical isolation between power grid and load, suppressing harmonic interference, stabilizing voltage output, and ensuring safe operation of equipment. With the continuous increase of power demand of industrial equipment, higher requirements are put forward for the operation stability, structural adaptability, maintenance convenience, and parameter adjustability of the large-power three-phase isolation transformer. However, there are still many defects in the related products in the prior art that need to be solved.

[0003] Specifically, the existing winding limit of the large-power three-phase isolation transformer adopts a rigid fixing mode, which can only realize static limiting in the initial installation stage and cannot cope with dynamic changes in high-power operation. On the one hand, under high-power working conditions, the heat generated by copper loss and iron loss of the transformer winding increases significantly, and thermal expansion and contraction phenomenon easily occurs. The traditional rigid limiting cannot adaptively adjust the limiting position and intensity. If the limiting is too tight, it will cause the winding to deform and even damage the insulation layer. If the limiting is loose, it will cause the displacement of the winding, resulting in the relative position deviation of the primary winding and the secondary winding, which not only reduces the electromagnetic induction efficiency, but also may cause partial discharge, electromagnetic abnormal sound and other faults, and even short circuit in severe cases. In addition, in order to ensure the insulation performance and control the short-circuit impedance, an isolation structure needs to be arranged between the primary winding and the secondary winding of the large-power three-phase isolation transformer. In the prior art, the isolation structure is mostly an insulating plate with fixed thickness in an integral type. The requirements for the short-circuit impedance of the transformer are different under different load scenarios, and the short-circuit impedance is directly related to the distance between the primary winding and the secondary winding. The existing fixed-thickness isolation plate needs to be replaced as a whole to change the distance, which not only has high material cost, but also needs to disassemble and reassemble the winding, which is complicated and time-consuming. In view of the above problems, there are related patent technologies in the prior art. For example, FR3156979A1 discloses a three-phase transformer for isolated voltage converters, which includes a magnetic circuit including a first part and a second part, each part including a base having a substantially triangular profile, and three studs each extending towards the base of the other part of the magnetic circuit for three support elements of electrical conductors. However, the above existing problems and the corresponding prior art have not achieved a better effect. SUMMARY

[0004] The purpose of the present application is to provide a large-power three-phase isolation transformer. The transformer of the present application can realize dynamic limiting of the transformer winding, adapt to the installation deviation and thermal expansion and contraction change of the winding, and effectively improve the operation stability of the transformer under high-power working conditions.

[0005] To solve the above technical problems, the present application specifically provides the following technical solutions: A large-power three-phase isolation transformer, comprising a winding, an upper yoke fixing structure and a lower yoke fixing structure arranged above and below the winding respectively, a limiting assembly arranged above the upper yoke fixing structure, the limiting assembly comprising a base frame, at least two first limiting rods arranged horizontally on the side of the base frame, a moving frame movably arranged on the first limiting rod, a second limiting rod arranged vertically at the bottom of the moving frame, and a plugboard connected to the bottom of the second limiting rod and in contact with the bottom of the winding. The upper yoke fixing structure and the lower yoke fixing structure cooperate to form stable support for the winding from the top and bottom directions. Further, the base frame of the limiting assembly provides an installation basis for the at least two horizontal first limiting rods, and the moving frame on the first limiting rod is movable relative to the first limiting rod, driving the second limiting rod and the connected plugboard at the bottom to adjust the position synchronously. After the plugboard is in contact with the bottom of the winding, the size change caused by the installation deviation of the winding or thermal expansion and cold contraction can be adapted, the horizontal accurate limiting of the winding is realized, and the relative position disorder of the primary and secondary windings caused by the deviation of the winding is prevented.

[0006] According to an embodiment of the present application, the first limiting rod is provided with a plug-in rod arranged horizontally thereon, the plug-in rod is provided with a plug-in block movably arranged thereon, the plug-in block is provided with rod bodies on both sides and connected with the moving frame, and the plug-in block is displaced relative to the first limiting rod to drive the moving frame to displace synchronously. The moving frame has a horizontal plate arranged at the bottom of the first limiting rod, vertical plates extending upward on both sides of the horizontal plate, and clamping interfaces at the upper ends of the vertical plates and connected with the rod bodies on both sides of the plug-in block. The plug-in rod is provided with annular grooves arranged at intervals thereon, and the plug-in block is provided with a rubber ring capable of deforming on the inner wall of the through hole. Under the action of an external force, the rubber ring on the inner wall of the through hole of the plug-in block can be displaced to different annular grooves on the plug-in rod. The plug-in rod on the first limiting rod provides a moving reference for the plug-in block. The annular grooves arranged at intervals thereon cooperate with the deformed rubber ring on the inner wall of the through hole of the plug-in block. Under the action of an external force, the rubber ring can deform and slide and be clamped into different annular grooves to realize positioning of the plug-in block. The rod bodies on both sides of the plug-in block are connected with the moving frame through the clamping interfaces at the upper ends of the vertical plates of the moving frame. When the plug-in block is displaced relative to the first limiting rod, the moving frame can be driven to move stably along the first limiting rod. The horizontal plate of the moving frame is attached to the bottom of the first limiting rod to prevent deviation during displacement, thereby stably linking the second limiting rod and the plugboard to adjust the limiting position of the winding and realizing manual adjustment during installation.

[0007] According to an embodiment of the present application, the first limiting rod is provided with a plug-in rod arranged horizontally thereon, the plug-in rod is provided with a plug-in block movably arranged thereon, the plug-in block is provided with rod bodies on both sides and connected with the moving frame, and the plug-in block is displaced relative to the first limiting rod to drive the moving frame to displace synchronously. The moving frame has a horizontal plate arranged at the bottom of the first limiting rod, vertical plates extending upward on both sides of the horizontal plate, and clamping interfaces at the upper ends of the vertical plates and connected with the rod bodies on both sides of the plug-in block. The plug-in rod is provided with annular grooves arranged at intervals thereon, and the plug-in block is provided with a rubber ring capable of deforming on the inner wall of the through hole. Under the action of an external force, the rubber ring on the inner wall of the through hole of the plug-in block can be displaced to different annular grooves on the plug-in rod. The plug-in rod on the first limiting rod provides a moving reference for the plug-in block. The annular grooves arranged at intervals thereon cooperate with the deformed rubber ring on the inner wall of the through hole of the plug-in block. Under the action of an external force, the rubber ring can deform and slide and be clamped into different annular grooves to realize positioning of the plug-in block. The rod bodies on both sides of the plug-in block are connected with the moving frame through the clamping interfaces at the upper ends of the vertical plates of the moving frame. When the plug-in block is displaced relative to the first limiting rod, the moving frame can be driven to move stably along the first limiting rod. The horizontal plate of the moving frame is attached to the bottom of the first limiting rod to prevent deviation during displacement, thereby stably linking the second limiting rod and the plugboard to adjust the limiting position of the winding and realizing manual adjustment during installation.

[0008] According to an embodiment of the present application, the base frame has an upper base plate and a lower base plate arranged in a vertical direction, the upper base plate and the lower base plate are connected by a connecting rod, and the first limiting rod is arranged on the lower base plate. The base frame has a stable frame structure formed by the upper base plate, the lower base plate and the connecting rod arranged in a vertical direction.

[0009] According to an embodiment of the present application, the first limiting rod is provided with a lead screw, the lead screw is provided with a lead screw nut capable of moving relative to the lead screw, the lead screw nut is provided with a rod body on both sides and is connected to the moving frame, and the lead screw nut is displaced relative to the first limiting rod to synchronously drive the moving frame to be displaced. The moving frame has a horizontal plate arranged at the bottom of the first limiting rod, vertical plates extending upward on both sides of the horizontal plate, and the upper end of each vertical plate has a clamping interface connected to the rod body on both sides of the lead screw nut. The lead screw nut can stably displace along the lead screw and has high transmission accuracy, avoiding the deviation that may occur in manual adjustment. The rod bodies on both sides of the lead screw nut are connected to the clamping interfaces at the upper end of the vertical plates of the moving frame, and the moving frame is firmly connected to the moving frame, so that the displacement of the lead screw nut relative to the first limiting rod can be synchronously transmitted to the moving frame. The horizontal plate of the moving frame is attached to the bottom of the first limiting rod, which can limit the shaking and deviation of the moving frame during displacement, ensure the stable movement of the moving frame along the first limiting rod, and further drive the second limiting rod and the plug-in plate to accurately adjust the limiting position of the winding, avoiding the displacement of the winding due to the deviation of the limiting position during operation.

[0010] According to an embodiment of the present application, the first limiting rod is provided with a lead screw arranged horizontally relative to the first limiting rod, and the lead screw is connected to the first limiting rod through a bearing seat at both ends. The first limiting rod and the lead screw are arranged horizontally, which can ensure that the transmission direction of the lead screw is consistent with the extension direction of the first limiting rod, avoiding the displacement deviation of the lead screw nut due to the angle deviation of the two. The bearing seat is used to fix the end position of the lead screw, reducing the radial runout and axial runout of the lead screw during rotation, and ensuring the stability of the lead screw.

[0011] According to an embodiment of the present application, the upper base plate is provided with a driving motor, the end of the lead screw is provided with a first bevel gear, the output end of the driving motor is arranged between the upper base plate and the lower base plate, and the output end of the driving motor has a second bevel gear meshing with the first bevel gear. The second bevel gear of the output end of the driving motor can mesh with the first bevel gear at the end of the lead screw, and then the power of the driving motor can be transmitted to the lead screw to drive the lead screw to rotate. When the lead screw rotates, the lead screw nut on the lead screw can displace along the lead screw. Through the connection of the rod bodies on both sides of the lead screw nut and the clamping interfaces of the vertical plates of the moving frame, the moving frame can be synchronously driven to move along the first limiting rod, and then the second limiting rod and the plug-in plate can be driven to adjust the limiting position of the winding, avoiding the deviation of manual adjustment and ensuring the stability of the winding position.

[0012] According to an embodiment of the present application, the winding has a core, the core is provided with a secondary winding, and the outer side of the secondary winding is provided with a primary winding. The primary winding is arranged at intervals on the outer side of the secondary winding. The arrangement of the primary winding at intervals on the outer side of the secondary winding can guarantee the insulation performance between the primary winding and the secondary winding, avoid short circuit caused by insulation failure during high-power operation, and reserve space for subsequent installation of an isolation component, so as to facilitate adjustment of the interval to optimize short-circuit impedance and adapt to different high-power load requirements. In addition, the inner-outer layered layout can shorten the magnetic flux path and reduce electromagnetic loss.

[0013] According to an embodiment of the present application, an isolation component is arranged between the secondary winding and the primary winding. The isolation component includes two oppositely arranged first isolation plates and second isolation plates. The side surface of the first isolation plate is surrounded by first plug-in plates, and the first plug-in plates form plug-in slots therebetween. The side surface of the second isolation plate is provided with second plug-in plates connected with the plug-in slots. The first isolation plate and the second isolation plate are oppositely arranged to separate the secondary winding and the primary winding, so as to ensure insulation and avoid short circuit caused by insulation failure between the windings during high-power operation. Further, the first plug-in plates surrounding the side surface of the first isolation plate form plug-in slots, which cooperate with the second plug-in plates on the side surface of the second isolation plate. In this way, the first isolation plate and the second isolation plate can be spliced, and the overall thickness of the isolation component can be changed by adjusting the depth of the second plug-in plates inserted into the plug-in slots, so as to adapt to the adjustment requirements of the distance between the primary winding and the secondary winding and the short-circuit impedance under different working conditions. In addition, the second plug-in plates and the first plug-in plates in a surrounding manner can make the isolation effect more uniform, reduce local magnetic leakage, and ensure the operation stability of the transformer under high-power working conditions.

[0014] The outer side of each of the first isolation plate and the second isolation plate is connected with an auxiliary ring through an extension rod. The auxiliary ring connected to the outer side of the first isolation plate and the second isolation plate through the extension rod can form a surrounding support for the first isolation plate and the second isolation plate. The auxiliary ring can disperse the stress generated by electromagnetic force or vibration of the first isolation plate and the second isolation plate during high-power operation, so as to prevent local deformation or misalignment of the two isolation plates.

[0015] According to an embodiment of the present application, the side surface of the first plug-in plate is provided with sequentially arranged rolling balls, and the second plug-in plate is provided with sliding grooves allowing the rolling balls to move. The rolling balls can roll along the sliding grooves, and the sliding friction between the first plug-in plate and the second plug-in plate is converted into rolling friction, so as to reduce the resistance when the two plug-in plates move relative to each other. In addition, the rolling friction can reduce the wear between the plug-in plates and ensure that the two plug-in plates are tightly attached and do not deviate during movement.

[0016] Compared with the prior art, the present application has the beneficial effects that: the present application can change the spacing of the primary winding and the secondary winding by adjusting the isolation assembly, without the need to replace the isolation assembly as a whole to adapt to the short-circuit impedance requirement under different working conditions, in addition, the present application provides different schemes of the limiting assembly, which can be freely selected according to the actual situation, that is, it can be manually adjusted and also can realize automatic adjustment, self-adapting to the winding installation deviation and the size change caused by thermal expansion and cold contraction in high-power operation, avoiding the winding deformation, insulation layer damage or displacement offset problem caused by the traditional rigid limiting, and guaranteeing the electromagnetic induction efficiency and operation safety. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only exemplary, and other implementation drawings can also be obtained according to the provided drawings without creative labor for those skilled in the art.

[0018] Figure 1 It is a first use state schematic diagram of the high-power three-phase isolation transformer of the present application.

[0019] Figure 2 It is a second use state schematic diagram of the high-power three-phase isolation transformer of the present application.

[0020] Figure 3 It is a first scheme schematic diagram of the limiting assembly of the present application.

[0021] Figure 4 It is a second scheme schematic diagram of the limiting assembly of the present application.

[0022] Figure 5 It is a driving motor and base frame connection scheme schematic diagram of the present application.

[0023] Figure 6 It is a first limiting rod and second limiting rod connection scheme schematic diagram of the present application.

[0024] Figure 7 It is a whole winding sectional view of the high-power three-phase isolation transformer of the present application.

[0025] Figure 8 It is a single winding sectional view of the high-power three-phase isolation transformer of the present application.

[0026] Figure 9 It is a structure schematic diagram of the isolation assembly of the present application.

[0027] Figure 10 It is a first isolation plate and first plug plate scheme schematic diagram of the present application.

[0028] Figure 11 Figure 1 is a schematic diagram of the isolation assembly and the extended partition connection scheme of the present application.

[0029] Legend: 10. winding; 11. assembly connecting rod; 12. primary winding; 13. secondary winding; 20. lower yoke fixing structure; 30. upper yoke fixing structure; 40. limiting assembly; 41. base frame; 42. first limiting rod; 43. plug-in rod; 44. bearing seat; 45. moving frame; 46. second limiting rod; 47. plug-in plate; 48. plug-in block; 49. driving motor; 410. lead screw; 411. lead screw nut; 412. first bevel gear; 50. isolation assembly; 51. first isolation plate; 52. second isolation plate; 53. second plug-in plate; 54. first plug-in plate; 55. extension rod; 56. auxiliary ring; 57. ball; 60. auxiliary isolation plate; 70. iron core; 80. extended partition. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0031] The concepts involved in the present application will be described below with reference to the drawings. It should be noted that the following descriptions of the concepts are only for the purpose of making the content of the present application easier to understand, and do not limit the protection scope of the present application. Meanwhile, the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0032] Embodiment 1:

[0033] As shown in FIG. 8 Figure 1 -Appendix Figure 10As shown, the high-power three-phase isolation transformer includes a winding 10, and an upper yoke fixing structure 30 and a lower yoke fixing structure 20 are arranged above and below the winding 10 respectively, a limiting assembly 40 is arranged above the upper yoke fixing structure 30, the limiting assembly 40 includes a base frame 41, at least two first limiting rods 42 horizontally arranged are arranged on the side of the base frame 41, a movable frame 45 capable of moving relative to the first limiting rods 42 is arranged on the first limiting rods 42, a second limiting rod 46 vertically arranged is arranged at the bottom of the movable frame 45, and a plugboard 47 is connected to the bottom of the second limiting rod 46. The upper yoke fixing structure 30 cooperates with the lower yoke fixing structure 20 to form stable support for the winding 10 from the top and bottom directions. Further, the base frame 41 of the limiting assembly 40 provides an installation basis for the at least two horizontal first limiting rods 42, the movable frame 45 on the first limiting rods 42 can move relative to the first limiting rods 42, driving the second limiting rod 46 vertically arranged at the bottom and the connected plugboard 47 to adjust the position synchronously, and after the plugboard 47 contacts the bottom of the winding 10, the installation deviation of the winding 10 or the size change caused by thermal expansion and cold contraction can be adapted, the horizontal accurate limiting of the winding 10 is realized, and the relative position disorder of the primary and secondary windings caused by the deviation of the winding 10 is prevented.

[0034] A plug-in rod 43 is arranged on the first limiting rod 42, a plug-in block 48 capable of moving relative to the plug-in rod 43 is arranged on the plug-in rod 43, rod bodies are arranged on both sides of the plug-in block 48 and connected with the movable frame 45, and the plug-in block 48 is displaced relative to the first limiting rod 42, capable of synchronously driving the movable frame 45 to displace. The movable frame 45 has a horizontal plate arranged at the bottom of the first limiting rod 42, vertical plates extending upward are arranged on both sides of the horizontal plate, and the vertical plates have clamping interfaces connected with the rod bodies on both sides of the plug-in block 48. The plug-in rod 43 is provided with annular grooves at intervals, the plug-in block 48 has deformable rubber rings on the inner walls of the through holes, and the plug-in block 48 can drive the rubber rings on the inner walls of the through holes to be displaced to different annular grooves of the plug-in rod 43 under the action of external force. The plug-in rod 43 on the first limiting rod 42 provides a moving reference for the plug-in block 48, the annular grooves arranged at intervals cooperate with the deformable rubber rings on the inner walls of the through holes of the plug-in block 48, the rubber rings can deform and slide and be clamped into different annular grooves under the action of external force, and the positioning of the plug-in block 48 is realized; the rod bodies on both sides of the plug-in block 48 are connected with the movable frame 45 through the clamping interfaces on the upper ends of the vertical plates of the movable frame 45, and when the plug-in block 48 is displaced relative to the first limiting rod 42, the movable frame 45 can be synchronously driven to move stably along the first limiting rod 42, and the horizontal plate of the movable frame 45 is attached to the bottom of the first limiting rod 42, so that the displacement process is not deviated, and further, the limiting position of the winding 10 is adjusted by stably linking the second limiting rod 46 and the plugboard 47, and manual adjustment during installation is realized.

[0035] The first limiting rod 42 is provided with a plug-in rod 43 arranged horizontally therewith, and the two ends of the plug-in rod 43 are connected with the first limiting rod 42 through bearing seats 44. The two ends of the plug-in rod 43 are connected with the first limiting rod 42 through the bearing seats 44, the bearing seats 44 are used for fixing the two ends of the plug-in rod 43 to avoid shaking, deviation or axial movement during operation, and maintain the horizontal precision and structural stability of the plug-in rod 43.

[0036] The base frame 41 has an upper base plate and a lower base plate arranged vertically, the upper base plate and the lower base plate are connected through a connecting rod, and the first limiting rod 42 is arranged on the lower base plate. The base frame 41 forms a stable frame structure through the upper base plate, the lower base plate and the connecting rod connecting the two.

[0037] The first limiting rod 42 is provided with a lead screw 410, the lead screw 410 is provided with a lead screw nut 411 capable of moving relative thereto, the lead screw nut 411 is provided with a rod body on both sides and is connected with a moving frame 45, the lead screw nut 411 is displaced relative to the first limiting rod 42, and can synchronously drive the moving frame 45 to displace. The moving frame 45 has a horizontal plate arranged at the bottom of the first limiting rod 42, vertical plates extending upward are arranged on both sides of the horizontal plate, and the upper end of the vertical plate has a clamping port connected with the rod bodies on both sides of the lead screw nut 411. The lead screw nut 411 can stably displace along the lead screw 410 and has high transmission precision, avoiding the deviation easily occurred in manual adjustment, the rod bodies on both sides of the lead screw nut 411 are connected with the moving frame 45 through the clamping ports at the upper end of the vertical plate of the moving frame 45, and the displacement of the lead screw nut 411 relative to the first limiting rod 42 is synchronously transmitted to the moving frame 45; the horizontal plate of the moving frame 45 is attached to the bottom of the first limiting rod 42, which can limit the shaking and deviation of the moving frame 45 during displacement, ensure the stable movement of the moving frame 45 along the first limiting rod 42, and further drive the second limiting rod 46 and the plug-in plate 47 to accurately adjust the limiting position of the winding 10, avoiding the displacement of the winding 10 due to the limiting deviation during operation.

[0038] The first limiting rod 42 is provided with a lead screw 410 arranged horizontally therewith, and the two ends of the lead screw 410 are connected with the first limiting rod 42 through bearing seats 44. The first limiting rod 42 and the lead screw 410 are arranged horizontally, which can ensure that the transmission direction of the lead screw 410 is consistent with the extension direction of the first limiting rod 42, avoiding the displacement deviation of the lead screw nut 411 due to the angle deviation of the two; the bearing seats 44 are used for fixing the end positions of the lead screw 410, reducing the radial runout and axial movement of the lead screw 410 during rotation, and ensuring the stable operation of the lead screw 410.

[0039] The upper base plate is provided with a driving motor 49, the end of the lead screw 410 is provided with a first bevel gear 412, the output end of the driving motor 49 is arranged between the upper base plate and the lower base plate, and the output end of the driving motor 49 has a second bevel gear meshing with the first bevel gear 412. The second bevel gear of the output end of the driving motor 49 can mesh with the first bevel gear 412 at the end of the lead screw 410, and then the power of the driving motor 49 is transmitted to the lead screw 410 to drive the lead screw 410 to rotate. When the lead screw 410 rotates, the lead screw nut 411 on the lead screw 410 can displace along the lead screw 410. Through the connection of the two side rod bodies and the vertical plate clamping interface of the moving frame 45, the moving frame 45 is synchronously driven to move along the first limiting rod 42, and then the second limiting rod 46 and the plug-in board 47 are adjusted to adjust the limiting position of the winding 10, so as to avoid manual adjustment deviation and ensure the stability of the winding 10 position.

[0040] The winding 10 has an iron core 70, the iron core 70 is externally provided with a secondary winding 13, and the primary winding 12 is arranged at the outer side of the secondary winding 13. The primary winding 12 is arranged at the outer side of the secondary winding 13. The interval arrangement scheme can on the one hand guarantee the insulation performance between the primary winding 12 and the secondary winding 13, avoid short circuit caused by insulation failure during high-power operation, and on the other hand reserve space for subsequent installation of the isolation component 50, facilitate optimization of short-circuit impedance by adjusting the interval, adapt to different high-power load requirements, and shorten the magnetic flux path and reduce electromagnetic loss by the inner-outer layered layout.

[0041] The isolation component 50 is arranged between the secondary winding 13 and the primary winding 12, and the isolation component 50 includes two oppositely arranged first isolation plates 51 and second isolation plates 52. The first isolation plate 51 is circumferentially arranged with a first plug-in board 54 on the side surface, the first plug-in boards 54 form a plug-in slot therebetween, and the second isolation plate 52 has a second plug-in board 53 connected with the plug-in slot on the side surface. The first isolation plate 51 and the second isolation plate 52 are oppositely arranged to separate the secondary winding 13 and the primary winding 12, ensure insulation, and avoid short circuit caused by insulation failure between windings during high-power operation. Further, the first plug-in board 54 circumferentially arranged on the side surface of the first isolation plate 51 forms a plug-in slot, cooperates with the second plug-in board 53 on the side surface of the second isolation plate 52, so that the first isolation plate 51 and the second isolation plate 52 can be spliced, and the overall thickness of the isolation component 50 can be changed by adjusting the depth of the second plug-in board 53 inserted into the plug-in slot, thereby adapting to the adjustment requirements of the interval between the primary winding and the secondary winding and the short-circuit impedance under different working conditions. Meanwhile, the circumferential second plug-in board 53 and the first plug-in board 54 can make the isolation effect more uniform, reduce local magnetic leakage, and ensure the operation stability of the transformer under high-power working conditions.

[0042] Referring to the accompanying drawings Figure 9 , Figure 10As shown, the outer side of the first isolation plate 51 and the second isolation plate 52 are connected with auxiliary rings 56 through the extension rods 55. The auxiliary rings 56 connected with the extension rods 55 on the outer side of the first isolation plate 51 and the second isolation plate 52 can form a surrounding support for the first isolation plate 51 and the second isolation plate 52, wherein the auxiliary rings 56 can disperse the stress of the first isolation plate 51 and the second isolation plate 52 caused by electromagnetic force or vibration in high-power operation, and prevent local deformation or misalignment of the two isolation plates.

[0043] The first plug-in plate 54 has a plurality of balls 57 arranged in sequence on the side surface, and the second plug-in plate 53 is provided with a sliding groove allowing the balls 57 to move. The balls 57 can roll along the sliding groove, converting the sliding friction of the first plug-in plate 54 and the second plug-in plate 53 into rolling friction, reducing the resistance when the two plates move relative to each other. In addition, rolling friction can reduce wear between the plug-in plates and ensure that the two plug-in plates fit closely and do not deviate during movement.

[0044] Embodiment 2:

[0045] This embodiment includes the content of embodiment 1, and this embodiment is a further improvement based on embodiment 1.

[0046] Referring to the drawings Figure 1 As shown, the high-power three-phase isolation transformer has three windings 10, and the outer sides of the windings 10 are connected by assembling connecting rods 11; at least one winding 10 of the high-power three-phase isolation transformer is provided with a limiting assembly 40.

[0047] Embodiment 3:

[0048] This embodiment includes the content of embodiment 1, and this embodiment is a further improvement based on embodiment 1.

[0049] An auxiliary isolation plate 60 is further provided between the secondary winding 13 and the primary winding 12. The auxiliary isolation plate 60 can further improve the insulation strength between the secondary winding 13 and the primary winding 12, avoid insulation failure and breakdown risk between the windings caused by electromagnetic stress or temperature rise during high-power operation; on the other hand, the distance between the secondary winding 13 and the primary winding 12 can be adjusted by selecting auxiliary isolation plates 60 of different thicknesses.

[0050] Embodiment 4:

[0051] This embodiment includes the content of embodiment 1, and this embodiment is a further improvement based on embodiment 1.

[0052] The cross sections of the two end portions of the first plug-in plate 54 partially overlap or do not overlap in the vertical projection, the first plug-in plate 54 has the same structure shape as the second plug-in plate 53, and the cross sections of the two end portions of the second plug-in plate 53 partially overlap or do not overlap in the vertical projection. In this way, the first plug-in plate 54 and the second plug-in plate 53 can produce corresponding rotating movements with the change of the distance between them, which helps to resist electromagnetic force and vibration during high-power operation and reduces the risk of loosening at the splicing position.

[0053] Embodiment 5

[0054] This embodiment includes the content of embodiment 1, and this embodiment is a further improvement based on embodiment 1.

[0055] When there are multiple isolation assemblies 50 between the secondary winding 13 and the primary winding 12, the isolation assemblies 50 can be connected through the expansion partition plate 80, and the specific diagram is shown in FIG. 4. Figure 11 As shown in the figure, the multiple isolation assemblies 50 are arranged on the same side of the expansion partition plate 80, the first isolation plate 51 and the second isolation plate 52 are both provided with annular clamping grooves, the first isolation plate 51 and the second isolation plate 52 can be detachably connected with the expansion partition plate 80 through the clamping piece connection mode, and the expansion partition plate 80 is provided with corresponding clamping holes. When there are multiple isolation assemblies 50 between the secondary winding 13 and the primary winding 12, the multiple isolation assemblies 50 are arranged on the same side of the expansion partition plate 80, which can ensure that the isolation assemblies 50 are regularly distributed between the primary winding and the secondary winding, and avoid position deviation caused by scattered arrangement.

[0056] Embodiment 6

[0057] This embodiment includes the content of embodiment 1, and this embodiment is a further improvement based on embodiment 1.

[0058] Referring to FIG. 6, Figure 1 As shown in the figure, the limiting assembly 40 arranged outside the winding 10 has three second limiting rods 46; and the high-power three-phase isolation transformer is provided with the limiting assembly 40 on at least two windings 10.

[0059] It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like, indicate relative positions or orientations based on the positions or orientations shown in the drawings, and are used only to facilitate the description of the application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. Unless otherwise expressly specified and limited, the terms "mounting", "connecting", "connecting" and the like should be broadly interpreted, for example, they can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the application can be understood according to the specific circumstances.

[0060] The above-described embodiments and / or implementations are merely used to illustrate the preferred embodiments and / or implementations of the present application, and do not limit the embodiments of the present application in any form. Any person skilled in the art can make some changes or modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the present application, but should be considered as the same technology or embodiment as the present application.

[0061] The principles and implementations of the present application are described herein using specific examples. The above description of the embodiments is only used to help understand the method of the present application and its core idea. The above description is only the preferred embodiments of the present application. It should be noted that due to the limited nature of the language, there are objectively infinite specific structures. For those skilled in the art, without departing from the principles of the present application, some improvements, refinements or changes can be made, or the above technical features can be combined in an appropriate manner; these improvements, refinements, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be considered as the protection scope of the present application.

Claims

1. A high-power three-phase isolation transformer comprising a winding (10), an upper yoke fixing structure (30) and a lower yoke fixing structure (20) being arranged above and below the winding (10) respectively, characterized in that, The upper yoke fixing structure (30) is provided with a limiting assembly (40) above, the limiting assembly (40) includes a base frame (41), at least two horizontally placed first limiting rods (42) are arranged on the side of the base frame (41), a movable frame (45) capable of moving relative to the first limiting rod (42) is arranged on the first limiting rod (42), a second limiting rod (46) vertically arranged is arranged on the bottom of the movable frame (45), and a plug-in plate (47) is connected to the bottom of the second limiting rod (46); the plug-in plate (47) is in contact with the bottom of the winding (10); The base frame (41) has an upper base plate and a lower base plate arranged in an upper and lower interval, and the upper base plate and the lower base plate are connected by a connecting rod; the first limiting rod (42) is arranged on the lower base plate; A lead screw (410) is arranged on the first limiting rod (42), a lead screw nut (411) capable of moving relative to the lead screw (410) is arranged on the lead screw (410), rod bodies are arranged on both sides of the lead screw nut (411) and connected with the movable frame (45), and the lead screw nut (411) is displaced relative to the first limiting rod (42) to synchronously drive the movable frame (45) to displace; A lead screw (410) horizontally arranged with the first limiting rod (42) is arranged on the first limiting rod (42), and the lead screw (410) is connected with the first limiting rod (42) through a bearing seat (44) at both ends. A drive motor (49) is arranged on the upper base plate, a first bevel gear (412) is arranged at the end of the lead screw (410), the output end of the drive motor (49) is arranged between the upper base plate and the lower base plate, and the output end of the drive motor (49) is provided with a second bevel gear meshing with the first bevel gear (412).

2. A high power three-phase isolation transformer according to claim 1, characterized in that, A plug-in rod (43) is arranged on the first limiting rod (42), a plug-in block (48) capable of moving relative to the plug-in rod (43) is arranged on the plug-in rod (43), rod bodies are arranged on both sides of the plug-in block (48) and connected with the movable frame (45), and the plug-in block (48) is displaced relative to the first limiting rod (42) to synchronously drive the movable frame (45) to displace.

3. A high power three-phase isolation transformer according to claim 2, characterized in that, A plug-in rod (43) horizontally arranged with the first limiting rod (42) is arranged on the first limiting rod (42), and the plug-in rod (43) is connected with the first limiting rod (42) through a bearing seat (44) at both ends.

4. The high power three-phase isolation transformer of claim 1, wherein, The winding (10) has an iron core (70), a secondary winding (13) is arranged outside the iron core (70), and a primary winding (12) is arranged outside the secondary winding (13) in an interval.

5. A high power three-phase isolation transformer according to claim 4, characterized in that, An isolation assembly (50) is arranged between the secondary winding (13) and the primary winding (12), the isolation assembly (50) includes two oppositely arranged first isolation plates (51) and second isolation plates (52), the first isolation plates (51) are surrounded by first plug-in plates (54) arranged on the side, the first plug-in plates (54) form plug-in grooves therebetween, and the second isolation plates (52) have second plug-in plates (53) connected with the plug-in grooves on the side.

6. A high power three-phase isolation transformer according to claim 5, characterized in that, The first plug-in plates (54) have sequentially arranged rolling balls (57) on the side, and the second plug-in plates (53) are provided with sliding grooves allowing the rolling balls (57) to move.

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