CN205354833U - Transfer and hold transformer winding - Google Patents

Abstract

The utility model discloses a capacity regulating transformer winding, which comprises a three-phase low-voltage winding, and each phase of the three-phase low-voltage winding comprises an iron core, an I-segment coil wound on the iron core, and an amplitude direction of the I-segment coil. Arranged combined coils, the combined coils include segment II coils and segment III coils that are symmetrically distributed along the iron core axis, and the three segment coils of I, II, and III are respectively wound with conductive sheets of sheet structure, so The first interlayer insulation is provided between two adjacent turns of the first conductive sheet in the II section coil, and the second interlayer insulation is provided between the adjacent two turns of the second conductive sheet in the III section coil. The interlayer insulation and the second interlayer insulation are integrally structured; intersegment insulation is provided between the first conductive sheet and the second conductive sheet of the same layer. The utility model adopts a sheet-like copper foil alloy sheet instead of a traditional copper wire to make a low-voltage coil, which has the advantages of convenient winding, high production efficiency, high filling factor of the iron core window, material saving and production cost reduction.

Description

Capacitance transformer winding

technical field

The utility model belongs to the field of transformers, in particular to a capacity regulating transformer winding.

Background technique

A capacity regulating transformer is a transformer with two capacities, large and small, which can be adjusted according to the size of the load. Its basic design idea is: the three-phase high-voltage winding of the transformer is connected into a triangle (D) when the capacity is large, and (Y) when the capacity is small. The low-voltage winding of each phase is composed of three parts: one is a small number of turns (the first coil, accounting for 27% of the low-voltage turns), and the other majority of turns is composed of two parts (the second coil, the third coil, accounting for 27% of the low-voltage turns). 73% of low voltage turns). When the capacity is large, the second coil and the third coil are connected in parallel and then connected in series with the first coil; when the capacity is small, the first coil, the second coil and the third coil are all connected in series. When the capacity is changed from large capacity to small capacity, the high-voltage winding is changed to Y connection to reduce the phase voltage, but the output voltage must remain unchanged, and the output voltage cannot be changed by increasing the number of turns of the low-voltage winding.

The low-voltage winding of the capacity regulating transformer consists of three parts, and how to wind it is a difficult point. The existing winding methods can be summarized as follows: one is the split winding of the second coil and the third coil in the width direction, the disadvantage of this winding method is: when the second coil and the third coil are used in parallel , because the magnetic fields induced by the two coils are different and their resistances are different, there is a large circulation loss; the other is that the second coil and the third coil are axially split and wound, this winding method has no circulation loss, However, the number of turns of the second coil and the third coil is large but the axial height is short, which is very difficult to arrange and wind; the head end and the tail end must be connected together, which limits the choice of the number of layers of the second coil and the third coil ; and the second coil and the third coil each need to be transposed, which doubles the transposition width and helix angle, and the space utilization rate is not high.

The Chinese patent CN102930964 discloses a three-phase capacity-adjusting transformer, which solves the problems of high and low voltage ampere-turn imbalance and circulating current by axially intersecting the second section winding and the third section winding winding on the iron core. Problems such as high loss have been eliminated, and production efficiency has been improved. However, there are the following disadvantages: for large-capacity transformers, the second section and the third section must use multiple wires to be wound in parallel. The transposition width and helix angle are doubled; if there are too many wires, it is more troublesome to transpose each other, it is not easy to upgrade, and the production efficiency is still not high; and the reasons for these shortcomings are mainly the result of using wires to make winding .

Utility model content

In order to overcome the deficiencies of the prior art, the utility model provides a capacity regulating transformer winding with high production efficiency, good ampere-turn balance and high space utilization.

In order to achieve the above purpose, the utility model adopts the following technical solutions: a capacity regulating transformer winding, including a three-phase low-voltage winding, each phase of the three-phase low-voltage winding includes an iron core, and a section I coil wound on the iron core And the combined coil arranged in the amplitude direction of the first section coil, the combined coil includes the second section coil and the third section coil which are symmetrically distributed along the iron core axis, and the three section coils of I, II, and III are respectively made of sheet structure The conductive sheet is wound, the first interlayer insulation is provided between two adjacent turns of the first conductive sheet in the second section coil, and the first interlayer insulation is provided between the adjacent two turns of the second conductive sheet in the third section coil. Two interlayer insulations, the first interlayer insulation and the second interlayer insulation are integrated; the first conductive sheet and the second conductive sheet of the same layer are provided with intersegment insulation. The utility model replaces the traditional copper wire with a sheet-like conductive sheet to make a low-voltage coil. It does not need to be transposed, and each turn is one layer. There is no problem of rising layers, and the winding is convenient and the production efficiency is high; moreover, the first The interlayer insulation and the second interlayer insulation are integrated structure, which effectively avoids the problem of short circuit caused by the displacement of the first interlayer insulation and the second interlayer insulation, and the oil channel is more convenient to set up, and can pass through the second section coil and the third section Coil setting, better heat dissipation performance; while the inter-segment insulation can be wound at the same time as the conductive sheet, not only the winding is convenient, but also the space occupied by the inter-segment insulation is greatly reduced, and the space filling factor is high; the second-segment coil and the third-segment coil are both Sheet structure winding, there is no transposition width in the winding process, there is no space occupied by the helix angle at both ends of the coil wound by wire, the space filling factor is high, and material is saved; the width of the conductive sheet can be determined arbitrarily, which is easy to meet the high-voltage winding The height requirement, the ampere-turn balance is good, and the short-circuit resistance ability is obviously improved;

Further, the thickness of the inter-segment insulation is less than or equal to the thickness of the conductive sheet.

Preferably, the conductive sheet is a metal foil.

Further, the width of the inter-segment insulation is 3-6mm; too narrow is not easy to process and coil, and too wide is a waste of space.

To sum up, the utility model has the following advantages: the utility model adopts the interlayer insulation of an integrated structure, which effectively solves the problem of inter-section insulation when the coils of the second section and the coil of the third section are axially split and arranged. The space is small, and the oil passage can be integrated; the second coil and the third coil adopt sheet-shaped conductive sheets, which are easy to wind, high in production efficiency, and have no transposition width, and there is no space occupied by the helix angle at both ends of the coil , high space utilization, saving materials; no circulation, good ampere-turn balance, strong short-circuit resistance.

Description of drawings

FIG. 1 is a structural schematic diagram of one of the phases and the iron core of the present invention.

FIG. 2 is a schematic partial cross-sectional view of one of the phases and the iron core of the present invention.

detailed description

In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model.

Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

In this embodiment, a schematic diagram of the external structure of the transformer is not provided, because the innovation of the present invention lies in the improvement of the internal coil of the transformer, specifically the improvement of the winding method and structure of the low-voltage winding of the transformer, as shown in Figure 1, 2 is a schematic diagram of a low-voltage winding and iron core of one phase and a schematic diagram of a partial cross-sectional structure. In the embodiment, the coil of section I is placed close to the iron core, that is, placed inside the coils of sections II and III. Of course, the positions of the two sections can be exchanged. The thickness and length of each component shown in FIG. 2 are schematic diagrams, not actual scales.

A capacity-regulating transformer winding proposed in this embodiment, as shown in Figure 1, includes three-phase low-voltage windings, and each phase of low-voltage windings includes segment I coils 2 and combined coils wound on the iron core 1, specifically , the combined coil and the section I coil are arranged in the width direction, the height of the two along the axial direction is equivalent, the cross-sectional area of one turn of the first section coil is equivalent to the total cross-sectional area of one turn when the combined coil is connected in parallel; the combined coil includes The segment II coil 3 and the segment III coil 4 are axially symmetrically distributed, that is, the coils of the segment II coil 3 and the segment III coil 4 have the same number of turns, and the same size and structure.

Specifically, the coils of the three sections I, II, and III are all wound with sheet-like conductive sheets, and the conductive sheets can be metal conductive foils, and the coil 2 of section I is wound on the side close to the iron core 1 , Section II coil 3 and Section III coil 4 are wrapped and wound outside Section I coil; Section II coil is located at the lower part of the iron core, and Section III coil is located at the upper part of the iron core; and the number of turns of Section I coil is less than that of Section II coil and Section III The number of turns of the section coil, that is to say, the second section coil and the third section coil are the majority of turns, and the first section coil is the minority turn section.

The second section coil 3 is wound by multiple turns of the first conductive sheet 31, wherein a first interlayer insulation is provided between the two adjacent turns of the first conductive sheet 31, and the third section coil 4 is made of multiple turns of the first conductive sheet 31. Two conductive sheets 41 are wound, and a second interlayer insulation is provided between two adjacent turns of the second conductive sheet 41. The first interlayer insulation and the second interlayer insulation are integrally structured, that is, the first interlayer insulation and the second interlayer insulation are integrated. The second interlayer insulation is combined into an integral interlayer insulation 12; as shown in Figure 2, it is a schematic cross-sectional view of one layer of the combined coil, between the first conductive sheet 31 and the second conductive sheet 41 of the same layer There is an inter-segment insulation 51, usually a strip-shaped insulating paper tape can be selected as the inter-segment insulation, and the inter-segment insulation can be wound together with the conductive sheet, that is, the first conductive sheet 31 of the coil 3 of the second segment, and the first conductive sheet 31 of the third segment coil 3 The second conductive sheet 41 of the coil 4 and the strip-shaped inter-segment insulation 51 are wound on a whole sheet of inter-layer insulation 12 at the same time, and the thickness of the inter-segment insulation 51 is equal to or slightly smaller than the thickness of the first conductive sheets 31, 41, It is advisable to set the width between 3-6mm. If it is too narrow, it is not easy to process and wind, and if it is too wide, it will waste space. If necessary, a heat dissipation oil channel can be set through the coils of the second segment and the third segment.

The winding process is as follows: as shown in Figure 1, the conductive sheet 21 of the first segment coil is wound on the insulating paper tube 7 surrounding the iron core 1, and the interlayer insulation 211 is provided between each turn of the conductive sheet 21, and the first segment coil An insulating layer 8 is provided on the outside, which can be a tightening binding tape or insulating paper, and if necessary, an oil channel can be placed here; a combined coil is wound on the insulating layer 8 .

The utility model uses metal conductive foil to wind the low-voltage winding of the capacity regulating transformer, and adopts integrated interlayer insulation for the second coil and the third coil, which solves the problem that the inter-segment insulation cannot be handled when the metal conductive foil is axially split and arranged. question. The solution is simple, and the inter-segment insulation takes up little space; the second and third segment coils are wound with metal conductive foil, which overcomes many difficulties and shortcomings when winding with wires, the design and winding are convenient, and the production efficiency is high; no replacement is required. position, there is no space occupied by the helix angle at both ends of the wire-wound coil, the space utilization rate is high, the material is saved, and the production cost is reduced.

Claims (4)

1. a capacitance-adjustable transformer winding, including three-phase low-voltage winding, described three-phase low-voltage winding often includes iron core (1) mutually, be wound on I section of coil (2) on described iron core (1) and with this I section of coil width to arrangement built-up coil, described built-up coil includes II section coil (3) that is axially symmetric along iron core and III section of coil (4), it is characterized in that: described I, II, III 3 sections of coils carry out coiling with the conducting strip of laminated structure respectively, described II section coil (3) is provided with the first layer insulation between adjacent two circles the first conducting strip (31), described III section of coil (4) is provided with the second layer insulation between adjacent two circles the second conducting strip (41), described first layer insulation and the second layer insulation are structure as a whole；It is provided with section insulation (51) between first conducting strip (31) and second conducting strip (41) of same layer.

2. capacitance-adjustable transformer winding according to claim 1, it is characterised in that: the thickness of described section insulation is less than or equal to the thickness of described conducting strip.

3. capacitance-adjustable transformer winding according to claim 1, it is characterised in that: described conducting strip is tinsel.

4. capacitance-adjustable transformer winding according to claim 1, it is characterised in that: the width of described section insulation is 3-6mm.