CN215417829U - Dry-type insulation high-voltage transformer - Google Patents

Abstract

The utility model relates to the technical field of high-voltage power transmission and distribution, in particular to a dry-type insulating high-voltage transformer. The dry-type insulated high-voltage transformer includes: a core assembly comprising at least one core limb; a low voltage winding disposed around the core limb; the high-voltage winding is arranged on the outer side of the low-voltage winding along the radial direction, and the high-voltage winding and the low-voltage winding are coaxially sleeved on the iron core column; the umbrella skirt part is formed by protruding the outer peripheral surface of the high-voltage winding, is arranged at two ends of the high-voltage winding along the axis direction, and is suitable for increasing the creepage distance along the surface. By arranging the umbrella skirt part, the creepage distance along the surface is effectively increased, the insulation reliability is improved, the outer insulation tolerance is stronger, the voltage grade of the transformer is favorably improved, the defect that the outer insulation tolerance of the dry-type insulation high-voltage transformer in the prior art is weak is overcome, and the dry-type insulation high-voltage transformer capable of improving the outer insulation tolerance of the dry-type insulation high-voltage transformer is provided.

Description

Dry-type insulation high-voltage transformer

Technical Field

The utility model relates to the technical field of high-voltage power transmission and distribution, in particular to a dry-type insulating high-voltage transformer.

Background

With the development of power transmission technology and the increase of power demand, high-voltage transformers are more and more widely applied, dry-type transformers have obvious technical advantages in fire prevention due to the fact that oil leakage does not exist, and fire risks caused by oil leakage of oil-immersed transformers can be effectively avoided. However, the dry-type insulating high-voltage transformer bears a power load for a long time, generates heat greatly, and has severe stress, under a long-term live operation condition, the generated insulating pollution can cause pollution flashover along the surface of the transformer, even breaks down the insulating structure of the transformer, once the insulating structure breaks down, insulation can not be recovered, potential safety hazards exist, the higher the voltage level of the transformer is, the higher the possibility of breaking down is, and therefore, the transformer is required to have stronger external insulation property and pollution flashover resistance along with the improvement of the voltage level and capacity requirements of the dry-type insulating high-voltage transformer.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem to be solved by the present invention is to overcome the defect of weak external insulation tolerance of the dry type insulation high voltage transformer in the prior art, so as to provide a dry type insulation high voltage transformer capable of improving the external insulation tolerance of the dry type insulation high voltage transformer.

In order to solve the above technical problem, the present invention provides a dry-type insulated high-voltage transformer, including:

a core assembly comprising at least one core limb;

a low voltage winding disposed around the core limb;

the high-voltage winding is arranged on the outer side of the low-voltage winding along the radial direction, and the high-voltage winding and the low-voltage winding are coaxially sleeved on the iron core column;

the umbrella skirt part is formed by the outer peripheral surface of the high-voltage winding in a protruding mode, the umbrella skirt part is arranged at the two ends of the high-voltage winding in the axial direction, and the surface creepage distance is suitable for being increased.

Optionally, the high voltage winding comprises:

an insulating cylinder;

a high voltage winding coil adapted to surround and be fixed on the insulating cylinder, the high voltage winding coil comprising 1 or more segmented units;

and the main insulating layer is suitable for wrapping the high-voltage winding coil.

Optionally, when the high-voltage winding coil includes 1 segment unit, the high-voltage winding further includes: the number of the basic terminals is 2, and the 2 basic terminals are respectively formed by two outgoing line ends at two ends of the high-voltage winding coil and are suitable for external wiring;

when the high voltage winding coil comprises a plurality of segmented units, the high voltage winding further comprises: the number of the basic terminals is 2, and the 2 basic terminals are respectively formed by the wire outlet ends of the starting ends of the segmentation units at the two ends and are suitable for external wiring; and

the number of the tapping terminals is 2 or more, the tapping terminals are formed by the wire outlet ends at the tail ends of the segmentation units positioned at the two ends, or the wire outlet ends at the starting end and the wire outlet ends at the tail end of the segmentation unit positioned in the middle, and the tapping terminals are suitable for adjusting the transformation ratio of the transformer.

Optionally, the low voltage winding includes: the first wiring terminal and the second wiring terminal are respectively communicated with two outlet ends of the low-voltage winding, and the first wiring terminal and the second wiring terminal are adjacent and arranged at the same end of the low-voltage winding at intervals.

Optionally, the iron core of iron core subassembly is multilayer lamination, the iron core includes iron core post and iron core horizontal part, the iron core horizontal part with iron core post structure is as an organic whole and mutually perpendicular sets up.

Optionally, the structural form of the iron core includes a three-phase three-column type, a two-phase two-column type, a single-phase single-column type and a single-phase two-column type.

Optionally, the dry-type insulating high-voltage transformer further includes: the iron core clamping pieces are arranged on two sides of the horizontal part of the iron core along the thickness direction of the iron core and are suitable for fixedly clamping the iron core;

the pull plate is of a wedge-shaped rod-shaped structure at two ends and is arranged along the height direction of the iron core column, and the wedge-shaped structures at the two ends of the pull plate are suitable for being connected with the clamping piece horizontal part of the iron core clamping piece in a clamping mode and suitable for exerting pressing force along the height direction on the iron core.

Optionally, the core clamp further includes: and the supporting part is arranged on the iron core clamping piece and is suitable for supporting and fixing the high-voltage winding.

Optionally, the dry-type insulating high-voltage transformer further includes: the bottom supporting block is suitable for supporting the high-voltage winding, one end of the bottom supporting block is abutted with the bottom of the high-voltage winding, and the end of the bottom supporting block, which is far away from the high-voltage winding, is abutted with the supporting part;

the top supporting block is used for enabling one end of the top supporting block to be abutted against the top of the high-voltage winding and enabling one end of the top supporting block, which is far away from the high-voltage winding, to be indirectly connected with the supporting part and is suitable for fixedly pressing the high-voltage winding;

and one end of the ejector rod is abutted against one end of the top supporting block, which is far away from the high-voltage winding, and one end of the ejector rod, which is far away from the top supporting block, is in threaded connection with the supporting part and is suitable for adjusting the pressure applied by the supporting part to the high-voltage winding.

Optionally, the main insulating layer is molded by casting, and is made of rubber.

The technical scheme of the utility model has the following advantages:

1. according to the dry-type insulated high-voltage transformer provided by the utility model, the creepage distance along the surface is effectively increased by arranging the umbrella skirt part, the design problem that the creepage distance along the surface can only be increased by increasing the structural height of the current dry-type insulated high-voltage transformer is solved, and the creepage distance along the surface is effectively increased under the condition of not increasing the height of the high-voltage winding, so that the insulation reliability is improved.

2. According to the dry-type insulated high-voltage transformer provided by the utility model, the high-voltage winding coil of the high-voltage winding comprises 1 or more segmentation units, and when the high-voltage winding coil comprises a plurality of segmentation units, the transformation ratio of the transformer can be adjusted by freely selecting the number of the segmentation units connected to a line, so that different voltage requirements are met, flexible expansion and application of different voltage grades are realized, and the dry-type insulated high-voltage transformer has better flexibility.

3. According to the dry-type insulated high-voltage transformer provided by the utility model, the first connecting terminal and the second connecting terminal which are arranged on the low-voltage winding are arranged at the same end of the low-voltage winding in an adjacent and spaced manner, the first connecting terminal and the second connecting terminal are arranged at intervals, and a certain gap is reserved between the two connecting terminals, so that the insulation between the two terminals of the low-voltage winding is realized.

4. According to the dry-type insulated high-voltage transformer provided by the utility model, the iron core clamping pieces are arranged on two sides of the iron core horizontal part along the thickness direction of the iron core, so that the iron core is fixedly clamped, meanwhile, the pull plate is matched and connected with the iron core clamping pieces, the wedge-shaped structures at two ends of the pull plate are clamped and connected with the clamping piece horizontal part of the iron core clamping pieces, so that the pull plate applies acting force along the height direction to the iron core clamping pieces, the iron core clamping pieces apply the acting force to the iron core, the iron core is pressed and fixed along the height direction, and the stability of the iron core is ensured.

5. According to the dry-type insulating high-voltage transformer provided by the utility model, one end of the bottom supporting block is abutted against the bottom of the high-voltage winding, and the end far away from the high-voltage winding is abutted against the supporting part, so that the bottom of the high-voltage winding is supported; one end of the top supporting block is abutted against the top of the high-voltage winding, one end of the top supporting block, which is far away from the high-voltage winding, is indirectly connected with the supporting part through the ejector rod, so that the top of the high-voltage winding is pressed, the ejector rod is in threaded connection with the supporting part, the height of the ejector rod is adjusted, and the pressing force of the high-voltage winding is adjusted.

6. The dry-type insulating high-voltage transformer provided by the utility model is beneficial to the molding processing and defect control of the transformer by adopting the molding mode of arranging the main insulating layer as casting molding, and the main insulating layer is made of rubber which has good elasticity, high moldability, interface characteristics, heat dissipation characteristics and high insulating strength and can be recycled repeatedly, so that compared with the traditional transformer made of epoxy resin, the dry-type insulating high-voltage transformer provided by the utility model has better insulating characteristics and molding characteristics and is more environment-friendly.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic diagram of the overall structure of a high voltage transformer according to the present invention;

FIG. 2 is a rear view of FIG. 1;

FIG. 3 is a schematic diagram of a high voltage winding structure according to the present invention;

FIG. 4 is a schematic diagram of a high voltage coil wire winding form according to the present invention;

FIG. 5 is a schematic diagram of a high voltage winding coil structure according to the present invention;

FIG. 6 is a schematic diagram of the outlet position of the low voltage winding structure of the present invention;

FIG. 7 is a partial schematic view of a high voltage transformer according to the present invention including a support block;

FIG. 8 is a partial schematic view of a high voltage transformer according to the present invention including a plunger;

FIG. 9 is a schematic structural view of the core assembly of the present invention;

fig. 10 is a schematic structural view of the iron core of the present invention.

Description of reference numerals:

1. a high voltage transformer; 2. a high voltage winding; 21. a high voltage winding coil; 211. a segmentation unit; 3. a low voltage winding; 4. an iron core assembly; 5. an insulating cylinder; 6. a main insulating layer; 7. an umbrella skirt; 8. a base terminal; 9. a tapping terminal; 10. a first connection terminal; 11. a second connection terminal; 12. a top support block; 13. a bottom support block; 14. a top rod; 15. an iron core; 151. a core limb; 152. a horizontal part of the iron core; 16. pulling a plate; 17. an iron core clamp; 171. a horizontal part of the clamp; 172. a side corner piece; 173. a support portion.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Referring to fig. 1 to 10, the dry-type insulated high-voltage transformer provided in this embodiment includes:

a core assembly 4 comprising at least one core limb 151;

a low voltage winding 3 disposed around the core leg 151;

the high-voltage winding 2 is arranged on the outer side of the low-voltage winding 3 in the radial direction, and the high-voltage winding 2 and the low-voltage winding 3 are coaxially sleeved on the iron core column 151;

the umbrella skirt part 7 is formed by the outer peripheral surface of the high-voltage winding 2 is raised, and the umbrella skirt part 7 is arranged at two ends of the high-voltage winding 2 along the axis direction and is suitable for increasing the creepage distance along the surface.

It should be noted that the low-voltage winding 3 and the high-voltage winding 2 are both formed by winding wires, the whole is cylindrical, the low-voltage winding 3 and the high-voltage winding 2 are coaxially arranged, and the axes of the two are overlapped; the radial direction refers to the radial direction of the low voltage winding 3 or the high voltage winding 2; the axial direction refers to a direction in which an axis of the high voltage winding 2 or the low voltage winding 3 is located.

It should be noted that the creepage distance refers to the shortest path between two conductive parts or between a conductive part and an equipment protection interface measured along an insulating surface, that is, in different use cases, the insulating material around the conductor is electrically polarized, so that the insulating material exhibits an electric charging phenomenon. Because umbrella skirt portion 7 by high voltage winding 2's outer peripheral face is protruding to be formed for along the face creepage distance increases, can play insulating effect better, promotes along face dielectric strength, realizes high voltage winding 2 is to reliable along the face insulating isolation requirement of long-term operation on ground, and the security is higher.

The dry-type insulation high-voltage transformer provided by the embodiment has the advantages that the umbrella skirt part 7 is arranged, the creepage distance along the surface is effectively increased, the design problem that the creepage distance along the surface can only be increased by increasing the structural height of the current dry-type insulation high-voltage transformer is solved, the creepage distance along the surface can be effectively increased under the condition that the height of a high-voltage winding is not increased, and therefore the insulation reliability is improved.

In particular, the high-voltage winding 2 comprises:

an insulating cylinder 5;

a high voltage winding coil 21 adapted to surround and be fixed on the insulation tube 5, the high voltage winding coil 21 comprising 1 or more segmented units 211;

a main insulation layer 6 adapted to wrap said high voltage winding coil 21.

Preferably, the insulation cylinder 5 is a rigid insulation tube and is used for supporting the high-voltage winding coil 21, the high-voltage winding coil 21 is wound outside the insulation cylinder 5, a certain gap is reserved between the high-voltage winding coil 21 and the insulation cylinder 5, and the main insulation layer 6 is integrally cast inside and outside the insulation cylinder 5 and the high-voltage winding coil 21, so that integral fixation and insulation are realized.

Preferably, the high-voltage winding coil 21 is formed by winding an insulated wire, the insulated wire is formed by a conductor layer and an insulating layer coated outside the conductor layer in an integrated manner, and the integrated structure effectively solves the problem of a layered interface between the conductor layer and the insulating layer of the high-voltage winding coil 21 of the traditional dry-type insulated transformer, thereby reducing interface defects and partial discharge, effectively improving the insulation reliability and being beneficial to improving the voltage grade of the high-voltage transformer.

Preferably, the main insulating layer 6 is made of the same material as the insulating layer of the insulated conductor, so that the main insulating layer 6 is fully compatible with the insulated conductor, the interface defects such as cracks and bubbles between the main insulating layer 6 and the insulated conductor are effectively eliminated, and meanwhile, due to the consistency of the homogeneous material of thermal expansion and cold contraction at high and low temperatures, the layering of a microscopic interface between the main insulating layer 6 and the insulated conductor is effectively avoided, so that the partial discharge at high pressure is effectively avoided, and the insulation reliability is improved.

In the dry-type insulated high-voltage transformer provided by this embodiment, the high-voltage winding coil 21 provided with the high-voltage winding 2 includes 1 or more segment units 211, and when the high-voltage winding coil 21 includes a plurality of segment units 211, the transformer transformation ratio can be adjusted by freely selecting the number of the segment units 211 connected to the line, so as to meet different voltage requirements, and achieve flexible extension and application of different voltage classes, and have better flexibility.

Specifically, when the high voltage winding coil 21 includes 1 segment unit 211, the high voltage winding 2 further includes: the number of the basic terminals 8 is 2, and the 2 basic terminals 8 are respectively formed by two outgoing line ends at two ends of the high-voltage winding coil 21 and are suitable for external wiring;

when the high voltage winding coil 21 comprises a plurality of segmented units 211, the high voltage winding 2 further comprises: the number of the basic terminals 8 is 2, and 2 of the basic terminals 8 are respectively formed by the wire outlet ends of the starting ends of the segmentation units 211 at the two ends and are suitable for external wiring; and

the number of the tapping terminals 9 is 2 or more, and the tapping terminals are formed by the wire outlet ends at the tail ends of the segmentation units 211 at the two ends, or formed by the wire outlet ends at the starting end and the wire outlet ends at the tail end of the segmentation unit 211 at the middle part, and are suitable for adjusting the transformer transformation ratio.

Preferably, the high voltage winding coil 21 is provided in 1 or more layers.

Note that, the two ends refer to two ends of the high-voltage winding coil 21 in the axial direction; the outgoing line ends refer to two ends of an insulated wire wound around the segmenting unit 211; the start ends of the segment units 211 at both ends refer to the ends of the insulated conductive wire close to the end of the high-voltage winding coil 21 in the axial direction, and the end ends of the segment units 211 at both ends refer to the ends of the insulated conductive wire far from the end of the high-voltage winding coil 21 in the axial direction; the start and end of the segment unit 211 located at the middle portion refer to both ends of an insulated wire around which the segment unit 211 is wound, respectively.

As shown in fig. 4, the high-voltage winding coil 21 includes a plurality of the segment units 211, each segment unit includes 1-n layers, each layer includes 1-n turns of the insulated conductive wire, where n is a positive integer. When the segmenting unit 211 is located at two ends of the high-voltage winding coil 21, the starting end of the segmenting unit 211, namely the outlet terminal close to the end of the high-voltage winding coil 21, is formed as the base terminal 8, and the outlet terminal at the tail end of the high-voltage winding coil 21 is formed as the tapping terminal 9; when the segment unit 211 is located in the middle of the high-voltage winding coil 21, the outlet terminals of the start and end of the segment unit 211 are formed as tapping terminals 9.

In particular, the low-voltage winding 3 comprises: first binding post 10 and second binding post 11, respectively with two outlet ends of low voltage winding 3 switch on mutually, first binding post 10 with second binding post 11 is adjacent and spaced each other set up in same one end of low voltage winding 3.

It should be noted that the low-voltage winding 3 is formed by winding a copper foil with a certain width according to a certain number of turns and then integrally pouring an insulating material for curing, and the first wiring terminal 10 and the second wiring terminal 11 are respectively conducted with two outlet ends of the low-voltage winding 3, so that the connection between the lead of the low-voltage winding 3 and an external circuit is realized through the first wiring terminal 10 and the second wiring terminal 11.

The dry-type insulation high-voltage transformer that this embodiment provided, through setting up first binding post 10 and the adjacent and spaced each other setting up of second binding post 11 of low voltage winding 3 in same one end of low voltage winding 3, first binding post 10 and the spaced setting each other of second binding post 11 remain certain clearance between two binding posts, have realized the insulation between two terminals of low voltage winding, simultaneously, the structural style that two binding post homonymy outgoing lines of low voltage winding 3 are convenient for the outside line and are carried out nimble wiring to structurally be favorable to saving space and reducing the supporting structure who associates, reduced transformer structure's complexity, promoted the convenience of wiring, make the structure more compact.

Specifically, the iron core 15 of the iron core assembly 4 is a multi-layer lamination structure, the iron core 15 includes an iron core column 151 and an iron core horizontal portion 152, and the iron core horizontal portion 152 and the iron core column 151 are integrally and mutually perpendicularly arranged.

Referring to fig. 10, a thickness direction of the core 15 is shown in an arrow direction of fig. 10, and the core 15 has a multi-layer laminated structure along the thickness direction; the core horizontal portion 152 is perpendicular to the core leg 151, and the core includes two core horizontal portions 152.

Specifically, the structural form of the iron core 15 includes a three-phase three-column type, a two-phase two-column type, a single-phase single-column type, and a single-phase two-column type.

Specifically, the dry-type insulated high-voltage transformer further includes: the iron core clamping pieces 17 are arranged on two sides of the iron core horizontal part 152 along the thickness direction of the iron core 15 and are suitable for fixedly clamping the iron core 15;

the pull plate 16 is provided with a rod-shaped structure with two wedge-shaped ends, and is arranged along the height direction of the iron core column 151, and the wedge-shaped structures at the two ends of the pull plate 16 are suitable for being connected with the clamping piece horizontal part 171 of the iron core clamping piece 17 in a clamping manner and are suitable for applying pressing force along the height direction to the iron core 15.

Referring to fig. 9, it should be noted that the height direction refers to the direction indicated by the arrow in fig. 9; the iron core clamping pieces 17 are arranged on two sides of the iron core horizontal portion 152 along the thickness direction of the iron core 15, the iron core clamping pieces 17 are arranged into two groups, the two groups of iron core clamping pieces 17 are respectively arranged on two sides of the two iron core horizontal portions 152, and the iron core 15 is fixed through the acting force of the iron core clamping pieces 17 along the thickness direction; meanwhile, the wedge-shaped structures at the two ends of the pulling plate 16 are connected with the clamping piece horizontal part 171 of the iron core clamping piece 17 in a clamping mode, the pulling plate 16 applies acting force to the iron core clamping piece 17 along the height direction, so that the two groups of iron core clamping pieces 17 are close to each other, then the iron core clamping piece 17 applies acting force to the iron core 15, the iron core 15 bears pressing force along the height direction, and the iron core 15 is pressed and fixed.

The dry-type insulation high-voltage transformer provided by this embodiment sets up iron core clamp 17 through the both sides along the thickness direction of iron core horizontal part 152 of iron core 15, realizes right the fixed clamp of iron core 15 presss from both sides tightly, simultaneously, through setting up arm-tie 16 with iron core clamp 17 cooperation is connected, the wedge structure at arm-tie 16 both ends with the clamp horizontal part 171 joint of iron core clamp 17 is connected, realizes arm-tie 16 is right iron core clamp 17 applys along direction of height's effort, and then iron core clamp 17 applys the effort on iron core 15, realize along direction of height to iron core 15 compresses tightly fixedly, thereby ensures iron core 15's firm.

Specifically, the core clip 17 further includes: and a support part 173 disposed on the core clamp 17 and adapted to support and fix the high voltage winding 2.

Preferably, the core clamp 17 further includes: the side corner member 172 is configured as a triangular structure, is connected to the support part 173, and is adapted to reinforce and fix the support part 173.

Specifically, the dry-type insulated high-voltage transformer further includes: a bottom support block 13, one end of which is abutted against the bottom of the high-voltage winding 2, and the end of which is away from the high-voltage winding 2 is abutted against the support part 173, and is adapted to support the high-voltage winding 2;

a top support block 12, one end of which abuts against the top of the high-voltage winding 2 and the end of which away from the high-voltage winding 2 is indirectly connected with the support part 173, and which is adapted to fixedly press the high-voltage winding 2;

one end of the ejector rod 14 abuts against one end of the top support block 12 far away from the high-voltage winding 2, and one end of the ejector rod 14 far away from the top support block 12 is in threaded connection with the support part 173 and is suitable for adjusting the pressure applied by the support part 173 to the high-voltage winding 2.

It should be noted that the bottom of the high-voltage winding refers to the lower end of the high-voltage winding 2 along the height direction of the iron core when the high-voltage winding and the iron core column 151 are coaxially arranged; the top of the high-voltage winding refers to the upper end of the high-voltage winding 2 along the height direction of the iron core when the high-voltage winding and the iron core column 151 are coaxially arranged.

The bottom support block 13 and the top support block 12 together realize structural support for the high-voltage winding 2; the top supporting block 12 is indirectly connected with the supporting portion 173 through the ejector 14, the ejector 14 is abutted against the top supporting block 12 through a ball head structure of the ejector 14, the ejector 14 is in threaded connection with the supporting portion 173, the height of the ejector 14 can be adjusted through threads, the adjustment of the distance between the top supporting block 12 and the supporting portion 173 is realized, and the pressing force borne by the high-voltage winding 2 is changed through the change of the distance.

In the dry-type insulated high-voltage transformer provided by this embodiment, one end of the bottom support block 13 is arranged to abut against the bottom of the high-voltage winding 2, and one end of the high-voltage winding 2 away from the support part 173 abuts against, so as to support the bottom of the high-voltage winding 2; one end of the top supporting block 12 is abutted to the top of the high-voltage winding 2, and one end of the top supporting block, which is far away from the high-voltage winding 2, is indirectly connected with the supporting part 173 through the ejector rod 14, so that the top of the high-voltage winding 2 is pressed, the ejector rod 14 is in threaded connection with the supporting part 173, the height of the ejector rod 14 is adjusted, and the adjustment of the pressing force of the high-voltage winding 2 is realized.

Specifically, the main insulating layer 6 is molded by casting, and is made of rubber.

The dry-type insulating high-voltage transformer provided by the embodiment is beneficial to the molding processing and defect control of the transformer by the molding mode of the main insulating layer 6, and the main insulating layer 6 is made of rubber which has good elasticity, high moldability, interface characteristics, heat dissipation characteristics and high insulating strength and can be recycled repeatedly, so that compared with the traditional transformer made of epoxy resin, the dry-type insulating high-voltage transformer provided by the utility model has better insulating characteristics and molding characteristics and is more environment-friendly.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the utility model.

Claims (10)

1. A dry-type insulated high voltage transformer, comprising:

a core assembly (4) comprising at least one core limb (151);

a low voltage winding (3) disposed around the core limb (151);

the high-voltage winding (2) is arranged on the outer side of the low-voltage winding (3) in the radial direction, and the high-voltage winding (2) and the low-voltage winding (3) are coaxially sleeved on the iron core column (151);

umbrella skirt portion (7), by the outer peripheral face arch of high voltage winding (2) forms, just umbrella skirt portion (7) set up in high voltage winding (2) are suitable for to increase along the face creepage distance along the both ends of axis direction.

2. A dry-type insulated high voltage transformer according to claim 1, characterized in that the high voltage winding (2) comprises:

an insulating cylinder (5);

a high voltage winding coil (21) adapted to surround and be fixed on the insulating cylinder (5), the high voltage winding coil (21) comprising 1 or more segmented units (211);

a main insulation layer (6) adapted to wrap the high voltage winding coil (21).

3. A dry-type insulated high voltage transformer according to claim 2, characterized in that when the high voltage winding coil (21) comprises 1 segmented unit (211), the high voltage winding (2) further comprises: the number of the basic terminals (8) is 2, and the 2 basic terminals (8) are respectively formed by two outlet end heads at two ends of the high-voltage winding coil (21) and are suitable for external wiring;

when the high voltage winding coil (21) comprises a plurality of segmented units (211), the high voltage winding (2) further comprises: the number of the basic terminals (8) is 2, and the 2 basic terminals (8) are respectively formed by the wire outlet ends of the starting ends of the segmentation units (211) at the two ends and are suitable for external wiring; and

the number of the tapping terminals (9) is 2 or more, the tapping terminals are formed by the wire outlet ends at the tail ends of the segmentation units (211) positioned at the two ends, or the wire outlet ends at the starting end and the wire outlet ends at the tail ends of the segmentation units (211) positioned in the middle, and the tapping terminals are suitable for adjusting the transformation ratio of the transformer.

4. A dry-type insulated high-voltage transformer according to claim 3, characterized in that the low-voltage winding (3) comprises: first binding post (10) and second binding post (11), respectively with two end of being qualified for the next round of competitions of low voltage winding (3) switch on mutually, first binding post (10) with second binding post (11) are adjacent and spaced each other set up in the same one end of low voltage winding (3).

5. A dry-insulated high voltage transformer according to claim 2, characterized in that the core (15) of the core assembly (4) is a multi-layer laminated structure, the core (15) comprising a core leg (151) and a core horizontal portion (152), the core horizontal portion (152) being constructed in one piece with the core leg (151) and being arranged perpendicular to each other.

6. Dry-insulated high-voltage transformer according to claim 5, characterized in that the core (15) is of a construction comprising a three-phase three-limb type, a two-phase two-limb type, a single-phase single-limb type and a single-phase two-limb type.

7. A dry-type insulated high-voltage transformer according to claim 5, characterized by further comprising: the iron core clamping pieces (17) are arranged on two sides of the iron core horizontal part (152) along the thickness direction of the iron core (15) and are suitable for fixedly clamping the iron core (15);

the pull plate (16) is arranged to be of a wedge-shaped rod-shaped structure at two ends and is arranged along the height direction of the iron core column (151), the wedge-shaped structures at the two ends of the pull plate (16) are suitable for being connected with a clamping piece horizontal part (171) of the iron core clamping piece (17) in a clamping mode and are suitable for being applied to the iron core (15) to exert acting force along the height direction.

8. A dry-type insulated high voltage transformer according to claim 7, characterized in that the core clamp (17) further comprises: and the supporting part (173) is arranged on the iron core clamping piece (17) and is suitable for supporting and fixing the high-voltage winding (2).

9. A dry-type insulated high-voltage transformer according to claim 8, characterized by further comprising: the bottom supporting block (13) is abutted with one end of the high-voltage winding (2) and the other end, far away from the high-voltage winding (2), of the bottom supporting block is abutted with the supporting part (173) and is suitable for supporting the high-voltage winding (2);

one end of the top supporting block (12) is abutted against the top of the high-voltage winding (2), and the end far away from the high-voltage winding (2) is indirectly connected with the supporting part (173) and is suitable for fixedly pressing the high-voltage winding (2);

and one end of the ejector rod (14) is abutted to one end, far away from the high-voltage winding (2), of the top support block (12), and one end, far away from the top support block (12), of the ejector rod (14) is in threaded connection with the support part (173) and is suitable for adjusting the pressure applied by the support part (173) to the high-voltage winding (2).

10. A dry-type insulated high voltage transformer according to any of claims 2-9, characterized in that the primary insulating layer (6) is molded by casting and is made of rubber.

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