CN110911116A - Stereo wound core transformer - Google Patents
Stereo wound core transformer Download PDFInfo
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- CN110911116A CN110911116A CN201911248237.0A CN201911248237A CN110911116A CN 110911116 A CN110911116 A CN 110911116A CN 201911248237 A CN201911248237 A CN 201911248237A CN 110911116 A CN110911116 A CN 110911116A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 221
- 238000004804 winding Methods 0.000 claims abstract description 168
- 229910052742 iron Inorganic materials 0.000 claims abstract description 98
- 238000003825 pressing Methods 0.000 claims abstract description 41
- 230000000712 assembly Effects 0.000 claims abstract description 25
- 238000000429 assembly Methods 0.000 claims abstract description 25
- 238000009413 insulation Methods 0.000 claims description 21
- 239000004593 Epoxy Substances 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 13
- 239000011521 glass Substances 0.000 claims description 12
- 239000004677 Nylon Substances 0.000 claims description 9
- 229920001778 nylon Polymers 0.000 claims description 9
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- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 3
- 238000010008 shearing Methods 0.000 claims description 3
- 239000012212 insulator Substances 0.000 description 7
- 238000003801 milling Methods 0.000 description 6
- 230000007704 transition Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000017105 transposition Effects 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- SLGWESQGEUXWJQ-UHFFFAOYSA-N formaldehyde;phenol Chemical compound O=C.OC1=CC=CC=C1 SLGWESQGEUXWJQ-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- -1 phenolic aldehyde Chemical class 0.000 description 2
- 229920001568 phenolic resin Polymers 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
- H01F27/263—Fastening parts of the core together
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/303—Clamping coils, windings or parts thereof together
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Of Transformers For General Uses (AREA)
Abstract
The invention provides a three-dimensional wound core transformer, which relates to the technical field of power equipment and comprises a three-dimensional wound core, a pressing assembly and two backing plate assemblies; the three-dimensional wound core comprises an upper iron yoke, a lower iron yoke and three iron core columns, wherein the three iron core columns are respectively wound with a winding, two backing plate assemblies are respectively arranged at two ends of the winding, one part of the two backing plate assemblies is clamped between the upper iron yoke and the winding, the other part of the two backing plate assemblies is clamped between the lower iron yoke and the winding, and the pressing assembly is used for preventing the two backing plate assemblies from being away from each other. The technical problem that the three-dimensional wound core transformer in the prior art is poor in short circuit resistance is solved.
Description
Technical Field
The invention relates to the technical field of power equipment, in particular to a three-dimensional wound core transformer.
Background
With the higher and higher requirements of the society on the quality of power supply, the quality requirements on the transformer are also stricter and stricter. From the analysis of transformer accident situation, the insufficient short-circuit resistance has become an important cause of power transformer accident. The electromagnetic force generated when the transformer is in short circuit depends on the structure of the product, and the electromagnetic forces generated by different structures are different; the short circuit resistance of the transformer depends greatly on the manufacturing process and material selection of the product. When the transformer is in a sudden short circuit, the winding is subjected to electromagnetic force under the action of a leakage magnetic field through short-circuit current. And judging by using a left-hand rule, wherein under the action of the longitudinal component of the longitudinal leakage magnetic field, the winding is subjected to a radial acting force, the high-voltage winding is subjected to an outward pulling force, and the low-voltage winding is subjected to an inward extruding force. Under the action of the transverse component of the longitudinal leakage magnetic field, the high-voltage and low-voltage windings are subjected to axial electromagnetic force.
Although the winding of the three-dimensional wound-core transformer is cylindrical, due to the special winding method and the iron core structure of the three-dimensional wound-core transformer, the winding and the clamping are difficult, and the short-circuit resistance of the three-dimensional wound-core transformer is difficult to improve.
Disclosure of Invention
The invention aims to provide a three-dimensional wound core transformer to solve the technical problem that the three-dimensional wound core transformer in the prior art is poor in short-circuit resistance.
The invention provides a three-dimensional wound core transformer, which comprises a three-dimensional wound core, a pressing assembly and two backing plate assemblies, wherein the three-dimensional wound core is provided with a plurality of coil winding cores;
the three-dimensional iron core that rolls up includes iron yoke, lower iron yoke and three iron leg, and is three the iron leg is all around being equipped with the winding, two the backing plate subassembly is divided and is located the both ends of winding, two one part in the backing plate subassembly presss from both sides and locates go up the iron yoke with between the winding, another part presss from both sides and locates down the iron yoke with between the winding, compress tightly the subassembly and be used for preventing two the backing plate subassembly is kept away from each other.
Further, the base plate assembly comprises a first outer ring base plate and an iron yoke insulating base plate;
along the width direction of the iron core column, the first outer ring base plate is positioned outside the three-dimensional wound iron core and is arranged in parallel with the upper iron yoke, wherein the first outer ring base plate is arranged in the base plate component between the upper iron yoke and the winding, the iron yoke insulating base plate is clamped between the upper iron yoke and the winding and arranged in the base plate component between the lower iron yoke and the winding, and the iron yoke insulating base plate is clamped between the lower iron yoke and the winding;
the iron yoke insulating pad plate is partially positioned outside the three-dimensional wound iron core and partially positioned in a triangular prism-shaped cavity of the three-dimensional wound iron core.
Further, the base plate assembly further comprises a central base plate and a second outer ring base plate;
along the width-to-width direction of iron-cored column, the center backing plate is located triangular prism shape cavity in the three-dimensional iron core of rolling and with the iron yoke insulating backing plate deviates from one side butt of winding, the second outer circle backing plate is located outside the three-dimensional iron core of rolling and with the iron yoke insulating backing plate deviates from one side butt of winding.
Furthermore, the cross section of the iron yoke insulating base plate is in a fan shape, and two ends of the iron yoke insulating base plate are located outside the three-dimensional wound core.
Furthermore, the insulating backing plate of yoke towards one side of winding is equipped with a plurality of milling flutes, and is a plurality of the length direction of milling flute intersects in the axis of insulating backing plate of yoke, just the one end opening of milling flute sets up, follows the axis direction of winding, the milling flute orientation the winding.
Further, the backing plate assembly further comprises an auxiliary backing plate, wherein the auxiliary backing plate comprises a first inclined surface and a second inclined surface;
the auxiliary backing plate is arranged in the backing plate assembly between the upper iron yoke and the winding, the auxiliary backing plate is partially clamped between the upper iron yoke and the iron yoke insulating backing plate, and is partially clamped between the central backing plate and the iron yoke insulating backing plate, the first inclined surface is abutted against the upper iron yoke, and the second inclined surface is abutted against the central backing plate;
the auxiliary backing plate is arranged in the backing plate assembly between the lower iron yoke and the winding, is partially clamped between the lower iron yoke and the iron yoke insulating backing plate, is partially clamped between the central backing plate and the iron yoke insulating backing plate, and is abutted against the first inclined surface and the lower iron yoke and abutted against the second inclined surface;
the central shim plate can give the auxiliary shim plate a tendency to move in the radial direction of the core limb for limiting axial movement of the winding.
Further, the dunnage assembly is made of laminated wood and/or nylon materials.
Further, the windings comprise a low-voltage winding and a high-voltage winding, and the height of the reactance center of the low-voltage winding is lower than that of the reactance center of the high-voltage winding.
Furthermore, the high-voltage winding is provided with an outlet X2 and an outlet X3 which are symmetrically arranged relative to the plane of the center of the high-voltage winding, the outlet X4 and the outlet X5 are symmetrically arranged relative to the plane of the center of the high-voltage winding, and the outlet X6 and the outlet X7 are symmetrically arranged relative to the plane of the center of the high-voltage winding.
Further, a cloth plate made of epoxy glass or epoxy phenolic aldehyde is isolated between the low-voltage winding and the iron core column, or a cylinder made of epoxy glass or epoxy phenolic aldehyde is isolated between the low-voltage winding and the iron core column, and a plurality of layers of epoxy glass wire adhesive tapes are bound on the outermost layer of the high-voltage winding.
Furthermore, the end insulation of the low-voltage winding is made of a nylon material, the end insulation is of a circular ring opening structure, and a notch used for bending or shearing the end insulation is formed in the side face of the end insulation.
Furthermore, the compressing assembly comprises an upper pressing plate, a lower pressing plate and a connecting piece for fixing the upper pressing plate and the lower pressing plate, the upper pressing plate is abutted to one side, deviating from the winding, of the backing plate assembly, and the lower pressing plate is abutted to one side, deviating from the winding, of the backing plate assembly.
Furthermore, the connecting piece comprises a first screw rod and a first nut, the axis of the first screw rod is superposed with the central axis of the three-dimensional wound core, a limiting block is welded on the side surface of the first screw rod close to the end part, the upper pressing plate is provided with a first positioning hole for the first screw rod to pass through, and the lower pressing plate is correspondingly provided with a second positioning hole for the first screw rod and the limiting block to pass through;
the limiting block can be pressed against one side, away from the upper pressing plate, of the lower pressing plate, and the first nut is in threaded connection with one end, away from the limiting block, of the first screw rod and pressed against one side, away from the lower pressing plate, of the upper pressing plate.
Compared with the prior art, the three-dimensional wound core transformer provided by the invention has the following beneficial effects:
the invention provides a three-dimensional wound core transformer which comprises a three-dimensional wound core, a winding, a pressing assembly and two backing plate assemblies, wherein three core columns are wound with the winding, at the moment, an upper iron yoke and a lower iron yoke of the three-dimensional wound core are arranged at intervals with the winding, one backing plate assembly is partially clamped between the upper iron yoke and the winding, the other backing plate assembly is partially clamped between the lower iron yoke and the winding, and the two backing plate assemblies are limited by the pressing assembly to prevent the winding from being clamped between the two backing plate assemblies after the two backing plate assemblies are away from each other. At the moment, the winding and the three-dimensional wound core are relatively fixed, when the winding is subjected to force along the axial direction of the core limb due to short circuit of the three-dimensional wound core transformer, the two backing plate assemblies prevent the winding and the core limb from axially and relatively moving, and the stability of the winding and each electrical connecting piece (such as a lead) connected with the winding is ensured.
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 view of a partial vertical cross-section structure of a three-dimensional wound core transformer according to an embodiment of the present invention;
fig. 2 is a schematic partial cross-sectional structure view of a three-dimensional wound core transformer according to an embodiment of the present invention;
fig. 3 is a schematic structural distribution diagram of a pad assembly of a three-dimensional wound core transformer provided in an embodiment of the present invention, except for an iron yoke insulating pad;
fig. 4 is a partial structural schematic view of an upper pressing plate of a three-dimensional wound core transformer according to an embodiment of the present invention;
fig. 5 is a schematic diagram of distribution of each tap of a high-voltage winding in the three-dimensional wound core transformer according to the embodiment of the present invention;
fig. 6 is a schematic structural diagram of a first screw and a limiting block in the three-dimensional wound core transformer according to the embodiment of the present invention;
fig. 7 is a schematic structural view of an iron yoke insulating pad plate in a three-dimensional wound core transformer according to an embodiment of the present invention;
fig. 8 is a schematic vertical sectional view of an insulating pad of an iron yoke and a winding in a three-dimensional wound core transformer according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a middle-end insulator of a three-dimensional wound core transformer according to an embodiment of the present invention.
Icon: 10-a three-dimensional wound core; 20-winding; 30-a first outer ring backing plate; 40-yoke insulating pad; 50-a central pad; 60-a second outer ring backing plate; 70-auxiliary backing plate; 80-an upper press plate; 90-a lower press plate; 110-a first screw; 120-a first nut; 130-a limiting block; 140-end insulation;
11-upper yoke; 12-lower iron yoke; 13-a core limb;
41-milling grooves;
141-notch.
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", etc., 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 particular orientation, be constructed and operated in a particular 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.
Referring to fig. 1, the three-dimensional wound core transformer provided by this embodiment includes a three-dimensional wound core 10, a winding 20, a pressing assembly, and two shim plate assemblies, wherein three core legs 13 are respectively wound with the winding 20, at this time, an upper iron yoke 11 and a lower iron yoke 12 of the three-dimensional wound core 10 are respectively disposed at an interval from the winding 20, in the two shim plate assemblies, one shim plate assembly is partially sandwiched between the upper iron yoke 11 and the winding 20, and the other shim plate assembly is partially sandwiched between the lower iron yoke 12 and the winding 20, and the two shim plate assemblies are limited by the pressing assembly to prevent the winding 20 from being clamped between the two shim plate assemblies after the two shim plate assemblies are away from each other. At this time, the winding 20 and the three-dimensional wound core 10 are relatively fixed, and when the winding 20 is subjected to a force along the axial direction of the core limb 13 due to a short circuit of the three-dimensional wound core transformer, the two backing plate assemblies prevent the winding 20 and the core limb 13 from axially moving relatively, so that the stability of the winding 20 and each electrical connector (such as a lead) connected with the winding 20 is ensured.
It should be noted that, in the present embodiment, three upper yokes 11 surround to form a regular triangle, three lower yokes 12 are provided and correspond to the three upper yokes 11 in the vertical direction one by one, and the three upper yokes 11 and the three lower yokes 12 surround together to form a cavity similar to a triangular prism; the corresponding regions (three in number) between the upper iron yoke 11 and the corresponding lower iron yoke 12 are transition regions of the three-dimensional wound core 10. Each core leg 13 is wound with a winding 20, and the three windings 20 are arranged in a regular triangle in the horizontal direction.
In this embodiment, the shim plate assembly includes a first outer ring shim plate 30 and an iron yoke insulating shim plate 40, and along the radial direction of the core limb 13, the first outer ring shim plate 30 is located outside the three-dimensional wound core 10 and is arranged in parallel with the upper iron yoke 11, wherein the first outer ring shim plate is arranged in the shim plate assembly between the upper iron yoke 11 and the winding 20, the iron yoke insulating shim plate 40 is clamped between the upper iron yoke 11 and the winding 20 and between the lower iron yoke 12 and the winding 20, and the iron yoke insulating shim plate 40 is clamped between the lower iron yoke 12 and the winding 20; the iron yoke insulating pad 40 is partially located outside the stereoscopic wound core 10 and partially located in the triangular prism-shaped cavity of the stereoscopic wound core 10.
Specifically, when the iron yoke insulating base plate 40 completes clamping of the portion of the winding 20 in the transition region, the rest portion also completes clamping of the rest portion of the winding 20 outside the transition region, and the first outer ring base plate 30 is used for completing clamping of the portion, which is not clamped, of the winding 20 outside the three-dimensional wound core 10, so as to further ensure that all layers of electromagnetic wires in the winding 20 are fixed in the axial direction of the core limb 13, and effectively avoid that the service life of a joint between a layer of electromagnetic wire and an adjacent layer of electromagnetic wire is influenced due to axial movement of the layer of electromagnetic wire and the adjacent layer of electromagnetic wire.
In this embodiment, the backing plate assembly further includes a central backing plate 50 and a second outer ring backing plate 60, along the radial direction of the iron core column 13, the central backing plate 50 is located in the triangular prism-shaped cavity of the three-dimensional wound core 10 and abuts against one side of the iron yoke insulating backing plate 40 departing from the winding 20, and the second outer ring backing plate 60 is located outside the three-dimensional wound core 10 and abuts against one side of the iron yoke insulating backing plate 40 departing from the winding 20.
Specifically, the central backing plate 50 and the second outer ring backing plate 60 press the iron yoke insulating backing plate 40 against the winding 20 together, so that the pressing area between the iron yoke insulating backing plate 40 and the winding 20 is further ensured, and meanwhile, when the second outer ring backing plate 60 completes the pressing of the end part of the iron yoke insulating backing plate 40, the two ends of the second outer ring backing plate are respectively abutted to the end parts of the two adjacent windings 20, so that the pressing area between the whole backing plate assembly and the winding 20 is further increased, and the short-circuit resistance of the three-dimensional wound core transformer is stronger.
In this embodiment, in each of the pad assemblies, the number of the first outer ring pad 30, the yoke insulating pad 40, and the second outer ring pad 60 is three, and the number of the center pad 50 is one.
Specifically, referring to fig. 3, three first outer ring shim plates 30 correspond to three windings 20 one to one, the first outer ring shim plates 30 are fan-shaped plates, axes of the fan-shaped plates coincide with axes of the corresponding windings 20, and it is preferable that the arc surfaces with smaller areas of the first outer ring shim plates 30 are in contact with the side walls of the core legs 13 corresponding to the corresponding windings 20. The second outer ring shim plate 60 is preferably configured as a saddle plate, and a side thereof facing the winding 20 is provided with a groove capable of accommodating an end portion of the yoke insulating shim plate 40, and the three outer ring shim plates correspond to the three upper yokes 11 one to one.
In this embodiment, the cross-sectional shape of the yoke insulating pad 40 is a sector, and both ends of the yoke insulating pad 40 are located outside the three-dimensional wound core 10.
Preferably, two ends of the iron yoke insulating pad 40 protrude out of different transition regions respectively, that is, the middle part of the iron yoke insulating pad 40 is located in a triangular prism-shaped cavity of the three-dimensional wound core 10, the three iron yoke insulating pads 40 correspond to the three windings 20 one by one, the axes of the three iron yoke insulating pads coincide with the axes of the corresponding windings 20, and the arc surface with a smaller area of the iron yoke insulating pad 40 is in contact with the side wall of the iron core column 13 corresponding to the corresponding winding 20 in an attaching manner.
At this time, the groove of one second outer ring shim plate 60 accommodates the end portions of the two yoke insulation shim plates 40 protruding from the same transition region, and after the second outer ring shim plate 60 completes the compression of the two windings 20 and the end portions of the two yoke insulation shim plates 40, the side of the second outer ring shim plate departing from the windings 20 and the side of the first outer ring shim plate 30 departing from the windings 20 are coplanar.
Referring to fig. 7 and 8, in the present embodiment, a plurality of milled grooves 41 are formed in a side of the yoke insulation pad 40 facing the winding 20, a length direction of the plurality of milled grooves 41 intersects with a central axis of the yoke insulation pad 40, and one end of the milled grooves 41 is opened, and the milled grooves 41 face the high voltage winding and a part of the low voltage winding along an axial direction of the winding 20.
The milling groove 41 is used as an oil flowing groove, so that the contact area between oil and the winding 20 is increased, and the heat dissipation efficiency of the winding 20 is improved. In addition, the milled groove 41 in this embodiment is opened at only one end, and compared with the arrangement in which both ends are opened, the strength of the iron yoke insulating pad 40 is also higher while the heat dissipation performance is ensured.
It should be noted that the first outer ring shim plate 30 and the second outer ring shim plate 60 in the present embodiment are also provided with milled grooves 41 for heat dissipation on the sides facing the windings 20.
In this embodiment, the backing plate assembly further includes an auxiliary backing plate 70, the auxiliary backing plate 70 includes a first inclined surface and a second inclined surface, taking the backing plate assembly located at the upper end of the three-dimensional wound core 10 as an example, the auxiliary backing plate 70 is partially sandwiched between the upper iron yoke 11 and the iron yoke insulating backing plate 40, and is partially sandwiched between the central backing plate 50 and the iron yoke insulating backing plate 40, the first inclined surface abuts against the upper iron yoke 11, the second inclined surface abuts against the central backing plate 50, and the central backing plate 50 can give the auxiliary backing plate 70 a tendency of moving in the radial direction of the iron core column 13, so as to limit the axial movement of the adjusting winding 20.
Specifically, the auxiliary pad plate 70 is a trapezoidal plate, when the central pad plate 50 moves close to the winding 20, the central pad plate 50 and the auxiliary pad plate 70 can move relatively, so that the auxiliary pad plate 70 can move outward of the three-dimensional wound core 10 along the radial direction of the core column 13, at this time, the distance between the upper yoke 11 and the yoke insulating pad plate 40 is further increased, and the yoke insulating pad plate 40 in another pad plate assembly further complete clamping of the winding 20.
Preferably, referring to fig. 2, the number of the auxiliary pad plates 70 is six, and each yoke insulating pad plate 40 corresponds to two auxiliary pad plates 70; the central backing plate 50 is also arranged to be a triangular plate, a third inclined surface is arranged at the position where the central backing plate 50 is abutted to the auxiliary backing plate 70, and the third inclined surface of the central backing plate 50 is parallel to the second inclined surface of the auxiliary backing plate 70.
It should be noted that, in this embodiment, a fourth inclined surface is also disposed on a side of the second outer ring backing plate 60 facing the three-dimensional wound core 10, and the second outer ring backing plate 60 is inserted into the transition region by this portion, so that the fourth inclined surface abuts against the upper iron yoke 11 or the lower iron yoke 12, and further the pressing of the iron yoke insulating backing plate 40 is completed.
In this embodiment, the dunnage assembly is made of laminated wood and/or nylon material.
Specifically, each pad in the pad assembly may be made of the same material, such as laminated wood board made of laminated wood, or high-density laminated paper board made of laminated wood, or nylon pad made of nylon material; alternatively, the pad assembly may be made of different materials, as well as any two or all of the three. The backing plate made of the three materials has higher strength, and can ensure the stability of the structure when the winding 20 is subjected to axial force.
In this embodiment, the winding 20 includes a low voltage winding wound on the core leg 13 and a high voltage winding wound on the low voltage winding, and the height of the reactance center of the low voltage winding is lower than that of the reactance center of the high voltage winding.
Specifically, the upper end insulation 140 of the low-voltage winding is larger than the lower end insulation 140, the transposition of the electromagnetic wires of the low-voltage winding in the odd layers is advanced by the transposition of N turns of the turns at the middle position of each layer, and the transposition of the electromagnetic wires of the low-voltage winding in the even layers is lagged by the transposition of N turns of the turns at the middle position of each layer, so that the axial force applied to the whole winding 20 after the short circuit of the transformer is more uniform, and the relative movement caused by uneven stress in the winding 20 is avoided.
Referring to fig. 5, in the present embodiment, the tap X2 and the tap X3 of the high-voltage winding are symmetrically disposed with respect to the plane of the center of the high-voltage winding, the tap X4 and the tap X5 are symmetrically disposed with respect to the plane of the center of the high-voltage winding, and the tap X6 and the tap X7 are symmetrically disposed with respect to the plane of the center of the high-voltage winding.
In this embodiment, a cloth plate made of epoxy glass or epoxy phenol formaldehyde is isolated between the low-voltage winding and the core limb 13, or a cylinder made of epoxy glass or epoxy phenol formaldehyde is isolated between the low-voltage winding and the core limb 13, and a plurality of layers of epoxy glass filament adhesive tapes are bound on the outermost layer of the high-voltage winding.
Specifically, before the low-voltage winding is wound, an epoxy glass cloth plate or an epoxy phenolic cylinder needs to be fixed on the core limb 13, and the low-voltage winding and the core limb 13 are insulated, and meanwhile, the strength is higher, the low-voltage winding and the core limb are basically not deformed and damaged due to the axial force applied to the cloth plate or the cylinder by the winding 20, and the insulation performance of the low-voltage winding and the core limb is ensured. Meanwhile, the epoxy glass wire adhesive tape is bound between every two adjacent layers of electromagnetic wires of the low-voltage winding, and the multiple layers of epoxy glass wire adhesive tapes are bound on the outermost layer of the high-voltage winding, so that the strength of each layer of electromagnetic wires of the winding 20 is further improved while the winding 20 is ensured to be insulated from other external electrical components.
Referring to fig. 9, in the present embodiment, the end insulator 140 of the low voltage winding is made of a nylon material, the end insulator 140 has an open circular structure, and a notch 141 for bending or shearing the end insulator 140 is formed on a side surface of the end insulator 140.
Specifically, the end insulation 140 made of nylon material has higher strength, so as to ensure that the electromagnetic wire of the winding 20 can be effectively supported under the short-circuit electromagnetic force, and avoid the problem that the winding 20 cannot be effectively supported due to the fragile damage of the material strength. By providing the notch 141, the end insulator 140 has a larger bending angle, and the end insulator 140 is effectively prevented from being broken due to excessive compression.
In this embodiment, the pressing assembly includes an upper pressing plate 80, a lower pressing plate 90 and a connector for fixing the upper pressing plate 80 and the lower pressing plate 90, wherein the upper pressing plate 80 abuts against one side of one of the pad assemblies away from the winding 20, and the lower pressing plate 90 abuts against one side of the other pad assembly away from the winding 20.
Specifically, referring to fig. 1 and 4, the upper pressing plate 80 and the lower pressing plate 90 both include a bracket similar to a triangular frame, the bracket abuts against three first outer ring base plates 30 and three second outer ring base plates 60 in the same base plate assembly at the same time, the cross section of the bracket is in a U shape with the opening level facing outwards, a plurality of connecting plates are inserted at intervals in the U-shaped groove of the bracket, the portions of the connecting plates protruding out of the bracket are provided with positioning holes, the connecting members include a screw rod and nuts, the screw rod penetrates through the positioning holes on the two corresponding connecting plates on the two brackets, the two nuts are respectively in threaded connection with the two ends of the screw rod, and the pressing and fixing of the two brackets on the base plates except for the central base.
Referring to fig. 6, in this embodiment, the connecting member includes a first screw 110 and a first nut 120, an axis of the first screw 110 coincides with a central axis of the three-dimensional wound core 10, a position of a side surface of the first screw 110 near an end portion is welded with a limiting block 130, two limiting blocks 130 are respectively disposed at two sides of the first screw 110, the upper press plate 80 is provided with a first positioning hole for the first screw 110 to pass through, and the lower press plate 90 is correspondingly provided with a second positioning hole for the first screw 110 and the limiting block 130 to pass through; the limiting block 130 can press against one side of the lower pressure plate 90 departing from the upper pressure plate 80, and the first nut 120 is in threaded connection with one end of the first screw 110 away from the limiting block 130 and presses against one side of the upper pressure plate 80 departing from the lower pressure plate 90.
Specifically, the upper press plate 80 further comprises an upper triangular plate separated from the support, the lower press plate 90 further comprises a lower triangular plate separated from the support, the first positioning hole is formed in the upper triangular plate, the second positioning hole is formed in the lower triangular plate, when the device is installed, the first screw rod 110 can penetrate through the second positioning hole of the lower triangular plate from the upper end opening of the triangular prism-shaped cavity downwards, then the first screw 110 is rotated by a certain angle, so that the limiting block 130 and the second positioning hole are staggered, the limiting block 130 can be abutted against the bottom surface of the lower triangular plate, then the two central backing plates 50 are sequentially sleeved into the first screw 110 in the mounting process of the backing plate assembly, after the mounting of the backing plate assembly is finished, the upper triangular plate is sleeved into the first screw 110, then, the first nut 120 is screwed with the first screw 110, and the upper triangle and the lower triangle complete the fixation of the two central tie plates 50.
Compared with the mode of welding the limiting part at the end part of the first screw 110, the limiting block 130 is fixed (preferably welded) on the side surface of the first screw 110, so that the contact area between the limiting block 130 and the first screw 110 is larger, the strength of the joint is higher, and the first screw 110 is more convenient to mount.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (13)
1. A three-dimensional wound core transformer, comprising:
the three-dimensional wound iron core comprises a three-dimensional wound iron core (10), wherein the three-dimensional wound iron core (10) comprises an upper iron yoke (11), a lower iron yoke (12) and three iron core columns (13), and windings (20) are wound on the three iron core columns (13);
the two backing plate assemblies are respectively arranged at two ends of the winding (20), one part of the two backing plate assemblies is clamped between the upper iron yoke (11) and the winding (20), and the other part of the two backing plate assemblies is clamped between the lower iron yoke (12) and the winding (20); and
and the pressing assembly is used for preventing the two cushion plate assemblies from moving away from each other.
2. The stereowound core transformer according to claim 1, wherein said shim plate assembly comprises a first outer ring shim plate (30) and a yoke insulating shim plate (40);
the first outer ring base plate (30) is located outside the three-dimensional wound core (10) along the radial direction of the core column (13) and is arranged in parallel with the upper iron yoke (11), wherein the first outer ring base plate is arranged in the base plate assembly between the upper iron yoke (11) and the winding (20), the iron yoke insulating base plate (40) is clamped between the upper iron yoke (11) and the winding (20) and arranged in the base plate assembly between the lower iron yoke (12) and the winding (20), and the iron yoke insulating base plate (40) is clamped between the lower iron yoke (12) and the winding (20);
the iron yoke insulating pad (40) is partially positioned outside the three-dimensional wound iron core (10) and partially positioned in a triangular prism-shaped cavity of the three-dimensional wound iron core (10).
3. The stereoscopic wound core transformer according to claim 2, wherein the shim plate assembly further comprises a center shim plate (50) and a second outer ring shim plate (60);
along the width of the iron core column (13), the central backing plate (50) is positioned in a triangular prism-shaped cavity of the three-dimensional wound iron core (10) and abutted against one side of the winding (20) deviated from the iron yoke insulating backing plate (40), and the second outer ring backing plate (60) is positioned outside the three-dimensional wound iron core (10) and abutted against one side of the winding (20) deviated from the iron yoke insulating backing plate (40).
4. The stereoscopic wound core transformer according to claim 3, wherein the yoke insulation pad (40) has a fan-shaped cross-sectional shape, and both ends of the yoke insulation pad (40) are located outside the stereoscopic wound core (10).
5. The three-dimensional wound core transformer according to claim 4, wherein a plurality of milled grooves (41) are formed in a side of the yoke insulation pad (40) facing the winding (20), a length direction of the plurality of milled grooves (41) intersects with a central axis of the yoke insulation pad (40), and one end of each milled groove (41) is open, and the milled grooves (41) face the winding along an axial direction of the winding (20).
6. The stereowound core transformer according to claim 3, wherein said shim plate assembly further comprises an auxiliary shim plate (70), said auxiliary shim plate (70) comprising a first slope and a second slope;
the auxiliary backing plate (70) is partially clamped between the upper iron yoke (11) and the iron yoke insulating backing plate (40) and partially clamped between the central backing plate (50) and the iron yoke insulating backing plate (40), the first inclined surface is abutted against the upper iron yoke (11), and the second inclined surface is abutted against the central backing plate (50);
in the base plate assembly arranged between the lower iron yoke (12) and the winding (20), the auxiliary base plate (70) is partially clamped between the lower iron yoke (12) and the iron yoke insulating base plate (40), and partially clamped between the central base plate (50) and the iron yoke insulating base plate (40), the first inclined surface is abutted against the lower iron yoke (12), and the second inclined surface is abutted against the central base plate (50);
the central pad (50) is able to give the auxiliary pad (70) a tendency to move in the radial direction of the core limb (13) for limiting the axial movement of the winding (20).
7. The stereoscopic wound core transformer according to claim 1, wherein the shim plate assembly is made of laminated wood and/or nylon material.
8. The space-transformer core according to any of the claims 1 to 7, wherein the windings (20) comprise a low voltage winding and a high voltage winding, the low voltage winding having a lower height of the center of reactance than the high voltage winding.
9. The three-dimensional wound core transformer according to claim 8, wherein the tap X2 and the tap X3 of the high voltage winding are symmetrically arranged with respect to a plane of a center of the high voltage winding, the tap X4 and the tap X5 are symmetrically arranged with respect to a plane of a center of the high voltage winding, and the tap X6 and the tap X7 are symmetrically arranged with respect to a plane of a center of the high voltage winding.
10. The three-dimensional wound core transformer according to claim 9, wherein a cloth plate made of epoxy glass or epoxy phenolic is isolated between said low voltage winding and said core leg (13), or a cylinder made of epoxy glass or epoxy phenolic is isolated between said low voltage winding and said core leg (13), and a plurality of layers of epoxy glass filament adhesive tapes are bound to an outermost layer of said high voltage winding.
11. The three-dimensional wound core transformer according to claim 10, wherein the end insulation (140) of the low voltage winding is made of nylon material, the end insulation (140) has an open circular ring structure, and the side of the end insulation (140) is provided with a notch (141) for bending or shearing the end insulation (140).
12. The three-dimensional wound core transformer according to any of claims 1 to 7, wherein said compression assembly comprises an upper pressure plate (80), a lower pressure plate (90) and a connector for fixing both, said upper pressure plate (80) being in abutment with one of said pad assemblies on a side facing away from said winding (20), said lower pressure plate (90) being in abutment with the other of said pad assemblies on a side facing away from said winding (20).
13. The stereoscopic wound core transformer according to claim 12, wherein the connecting member comprises a first screw (110) and a first nut (120), an axis of the first screw (110) coincides with a central axis of the stereoscopic wound core (10), a limiting block (130) is welded to a side surface of the first screw (110) near an end portion, the upper pressing plate (80) is provided with a first positioning hole for the first screw (110) to pass through, and the lower pressing plate (90) is correspondingly provided with a second positioning hole for the first screw (110) and the limiting block (130) to pass through;
the limiting block (130) can be pressed against one side, deviating from the upper pressing plate (80), of the lower pressing plate (90), and the first nut (120) is in threaded connection with one end, far away from the limiting block (130), of the first screw (110) and is pressed against one side, deviating from the lower pressing plate (90), of the upper pressing plate (80).
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| CN201911248237.0A CN110911116B (en) | 2019-12-06 | 2019-12-06 | Three-dimensional coiled iron core transformer |
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| CN201911248237.0A CN110911116B (en) | 2019-12-06 | 2019-12-06 | Three-dimensional coiled iron core transformer |
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| CN110911116B CN110911116B (en) | 2024-08-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115662779A (en) * | 2022-12-26 | 2023-01-31 | 河北高晶电器设备有限公司 | Automatic assembling device for three-dimensional wound core transformer core |
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| CN102262955A (en) * | 2010-05-28 | 2011-11-30 | 广东海鸿变压器有限公司 | 110kV and higher voltage level stereo triangle wound iron core power transformer |
| CN104319078A (en) * | 2014-10-11 | 2015-01-28 | 海鸿电气有限公司 | 110kV and above stereoscopic wound core transformer and winding process thereof |
| CN107808761A (en) * | 2017-12-04 | 2018-03-16 | 河南省森电电力设备股份有限公司 | A kind of anti-sudden short circuit three dimensional wound core transformer |
| CN210984482U (en) * | 2019-12-06 | 2020-07-10 | 山东电工电气集团智能电气有限公司 | Stereo wound core transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102262955A (en) * | 2010-05-28 | 2011-11-30 | 广东海鸿变压器有限公司 | 110kV and higher voltage level stereo triangle wound iron core power transformer |
| CN104319078A (en) * | 2014-10-11 | 2015-01-28 | 海鸿电气有限公司 | 110kV and above stereoscopic wound core transformer and winding process thereof |
| CN107808761A (en) * | 2017-12-04 | 2018-03-16 | 河南省森电电力设备股份有限公司 | A kind of anti-sudden short circuit three dimensional wound core transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115662779A (en) * | 2022-12-26 | 2023-01-31 | 河北高晶电器设备有限公司 | Automatic assembling device for three-dimensional wound core transformer core |
| CN115662779B (en) * | 2022-12-26 | 2023-04-14 | 河北高晶电器设备有限公司 | Automatic assembling device for three-dimensional roll iron core transformer iron core |
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| CN110911116B (en) | 2024-08-09 |
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