A UHV step-up transformer with coil leads connected in series

Abstract

The present invention belongs to the field of transformer lead connection, and specifically discloses an ultra-high voltage step-up transformer with coil leads connected in series, including: two core columns of coils, a first high-voltage coil wound on one core column, a second high-voltage coil wound on another core column, and a connection assembly for connecting the first high-voltage coil and the second high-voltage coil; the first high-voltage coil is connected in series with the second high-voltage coil; the connection assembly includes a plurality of voltage-equalizing tubes connected in sequence, a connector for connecting two adjacent voltage-equalizing tubes, and an insulating member wound on the outside of the voltage-equalizing tube; the lead between the first high-voltage coil and the second high-voltage coil is arranged inside the voltage-equalizing tube. The present invention adopts a double-column series structure, the number of high-voltage coil turns on the two core columns is equal, the lead potential is reduced, and the electrical insulation strength of the lead is easy to ensure. The structure of voltage-equalizing tube plus lead connection is adopted, the electrode shape is good, the structure is simple, the operation is convenient, and the lead insulation reliability is high.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer lead connection, and in particular relates to an ultra-high voltage step-up transformer with coil leads connected in series. Background Art

[0002] At present, UHV power transmission has been developing rapidly and continuously. At present, the UHV and ultra-large capacity step-up transformers that increase the voltage to 1100kV generally adopt a double-column parallel structure. In order to meet the insulation requirements, the UHV transformers with parallel structures need to ensure the height of the reactance. The transformer body is high. Except for the difference in the winding direction of the coils, the insulation structure of the two columns is exactly the same. The body is heavy, and the transportation dimensions and weight are limited by the operating conditions. In addition, the voltage of the inter-column connection is the same as the voltage of the high-voltage head end, and the insulation treatment requirements for the connection are very high.

[0003] In summary, the UHV step-up transformer with parallel structure is bulky, difficult to transport, and difficult to guarantee insulation performance. However, if the double-column series structure is adopted, although the voltage at the upper and lower ends of the first coil is half of the voltage in the middle of the first coil, such voltage is also very high, which will become a new quality hazard if not handled properly. Summary of the invention

[0004] The invention provides an ultra-high voltage step-up transformer with coil leads connected in series, so as to solve the problems that the existing ultra-high voltage step-up transformer is bulky, difficult to transport and difficult to ensure insulation performance.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: the UHV step-up transformer with coil leads connected in series, comprising: two core columns of coils, a first high-voltage coil wound on one core column, a second high-voltage coil wound on the other core column, and a connecting assembly for connecting the first high-voltage coil and the second high-voltage coil;

[0006] The first high-voltage coil is connected in series with the second high-voltage coil;

[0007] The connection assembly includes a plurality of pressure equalizing tubes connected in sequence, a connector for connecting two adjacent pressure equalizing tubes, and an insulating member wound outside the pressure equalizing tube;

[0008] The lead wire between the first high-voltage coil and the second high-voltage coil is arranged inside the voltage equalizing tube.

[0009] In a preferred embodiment of the present invention, the first high-voltage coil and the second high-voltage coil are of a middle-inlet structure, and the number of turns of the first high-voltage coil and the number of turns of the second high-voltage coil are equal.

[0010] In a preferred embodiment of the present invention, the first high-voltage coil includes a first upper coil and a first lower coil, and the second high-voltage coil includes a second upper coil and a second lower coil; the winding directions of the first upper coil and the first lower coil are opposite, and the winding directions of the second upper coil and the second lower coil are opposite, and the winding directions of the first upper coil and the second upper coil are opposite.

[0011] In a preferred embodiment of the present invention, the connecting assembly includes a first pressure-equalizing tube, a second pressure-equalizing tube and a third pressure-equalizing tube connected in sequence, a first connecting piece for connecting the first pressure-equalizing tube and the second pressure-equalizing tube, and a second connecting piece for connecting the second pressure-equalizing tube and the third pressure-equalizing tube.

[0012] In a preferred embodiment of the present invention, the two terminal outlets of the first high-voltage coil are respectively a first upper terminal outlet and a first lower terminal outlet, the lead wire led out of the first upper terminal outlet is a first lead wire, the lead wire led out of the first lower terminal outlet is a second lead wire, the first lead wire is electrically connected to the second lead wire, and is electrically connected to the second high-voltage coil through a third lead wire;

[0013] The first lead passes through the first pressure-equalizing tube to reach the interior of the second pressure-equalizing tube, and the second lead passes through the third pressure-equalizing tube to reach the interior of the second pressure-equalizing tube. The second pressure-equalizing tube is a three-way tube structure, and the first lead, the second lead and the third lead are respectively located in a pipeline in the second pressure-equalizing tube.

[0014] In a preferred embodiment of the present invention, the first connecting member comprises an aluminum tube, a contact plate disposed in the aluminum tube, and a screw for connecting the aluminum tube and the contact plate; the inner wall of the aluminum tube is provided with an internal thread, the contact plate is threadedly connected to the inside of the aluminum tube, the number of the contact plates is at least two, and they are evenly distributed along the circumference of the aluminum tube;

[0015] One end of the aluminum tube is connected to the first pressure equalizing tube, and the other end is connected to the second pressure equalizing tube. The first pressure equalizing tube and the second pressure equalizing tube are electrically connected through the contact plate.

[0016] In a preferred embodiment of the present invention, the second connecting member includes a first fixing plate, a second fixing plate, four terminal blocks, a lead connector and an insulated connecting lead; the first fixing plate and the second fixing plate are snap-fitted together, the cross-sections of the first fixing plate and the second fixing plate perpendicular to the axial direction of the second equalizing pressure tube are arc-shaped, the first fixing plate and the second fixing plate are snap-fitted together to form a accommodating cavity, and the accommodating cavity is a cylindrical space; when the first fixing plate and the second fixing plate are snap-fitted together, they at least partially cover the second equalizing pressure tube and the third equalizing pressure tube.

[0017] In a preferred embodiment of the present invention, the lead connector is detachable, and includes a first part and a second part connected by bolts, the first lead and the third lead are electrically connected to the first part, and the second lead is electrically connected to the second part.

[0018] In a preferred embodiment of the present invention, the four terminal blocks are respectively a first terminal block, a second terminal block, a third terminal block and a fourth terminal block; the first terminal block is fixed inside the second voltage-equalizing tube and is electrically connected to the second voltage-equalizing tube, the second terminal block is fixed inside the first fixing plate and is electrically connected to the first fixing plate, the third terminal block is fixed inside the third voltage-equalizing tube and is electrically connected to the third voltage-equalizing tube, and the fourth terminal block is fixed inside the second fixing plate and is electrically connected to the second fixing plate; the second part of the lead connector, the fourth terminal block, the first terminal block, the second terminal block and the third terminal block are electrically connected in sequence through an insulated connecting lead.

[0019] In a preferred embodiment of the present invention, it also includes a white cloth tape and crepe paper, wherein the white cloth tape is half-folded and wound in 4 layers on the outside of the first lead, the second lead, the third lead and the lead joint; the crepe paper is half-folded and wound on the outside of the first equalizing pressure tube, the second equalizing pressure tube, the third equalizing pressure tube, the first connecting piece and the second connecting piece.

[0020] The technical solution provided by the present invention has the following advantages compared with the prior art:

[0021] The present invention adopts a double-column series structure, the number of high-voltage coil turns on the two core columns is equal, the series connection potential between the high-voltage columns is 1 / 2 of the high-voltage head end potential, the lead potential is reduced, and the electrical insulation strength of the lead is easy to ensure. The structure of the voltage-equalizing tube plus the lead connection is adopted, the electrode shape is good, the structure is simple, the operation is convenient, and the lead insulation reliability is high. The transformer in the present invention has a small size, which solves the problem of transportation outer limit and transportation weight limitation. The lead connection structure is simple, the operation process is good, and the reliability is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of coil connection of a UHV step-up transformer with coil leads connected in series according to one embodiment of the present invention;

[0024] Figure 2 It is a schematic diagram of a body and outgoing wires of a UHV step-up transformer with coil leads connected in series according to one embodiment of the present invention;

[0025] Figure 3 It is a schematic diagram of a connection assembly of an ultra-high voltage step-up transformer with coil leads connected in series according to an embodiment of the present invention;

[0026] Figure 4 It is a schematic diagram of a first connecting piece of an ultra-high voltage step-up transformer with coil leads connected in series according to an embodiment of the present invention;

[0027] Figure 5 yes Figure 4 AA section view in the figure;

[0028] Figure 6 It is a schematic diagram of a second connecting piece of an ultra-high voltage step-up transformer with coil leads connected in series described in one embodiment of the present invention.

[0029] As shown in the figure:

[0030] 101-first high-voltage coil; 102-second high-voltage coil; 201-first equalizing tube; 202-second equalizing tube; 203-third equalizing tube; 301-first connecting piece; 3011-aluminum tube; 3012-contact plate; 3013-screw; 302-second connecting piece; 3021-first fixing plate; 3022-second fixing plate; 3023-first terminal block; 3024-second terminal block; 3025-third terminal block; 3026-fourth terminal block; 3027-lead connector; 3028-connecting lead; 401-first lead; 402-second lead; 403-third lead. DETAILED DESCRIPTION

[0031] For ease of understanding, the UHV step-up transformer with coil leads connected in series is described below in conjunction with embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation and positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0035] like Figure 1 As shown, the present invention discloses an ultra-high voltage step-up transformer with coil leads connected in series, comprising an iron core column with two coil sleeves, a first high-voltage coil 101 wound on one iron core column, a second high-voltage coil 102 wound on the other iron core column, and a connecting component for connecting the first high-voltage coil 101 and the second high-voltage coil 102.

[0036] The first high-voltage coil 101 and the second high-voltage coil 102 both use the middle incoming line, the first high-voltage coil 101 and the second high-voltage coil 102 have the same number of turns, and the first high-voltage coil 101 and the second high-voltage coil 102 are connected in series. Specifically, the first high-voltage coil 101 includes a first upper coil and a first lower coil, and the second high-voltage coil 102 includes a second upper coil and a second lower coil. The winding directions of the first upper coil and the first lower coil are opposite, the winding directions of the second upper coil and the second lower coil are opposite, and the winding directions of the first upper coil and the second upper coil are opposite.

[0037] Combination Figure 1 and Figure 2 , the two terminal outgoing wires of the first high-voltage coil 101 are led out at the same level between phases, such as Figure 2 As shown, the angle α between the center of the outlet and the center of the body is between 40° and 60°. Similarly, the two terminal outlets of the second high-voltage coil 102 are also led out at the same interval, and the angle α between the center of the outlet and the center of the body is between 40° and 60° to ensure the electrical distance from the lead to other components when leading out. The two terminal outlets of the first high-voltage coil 101 are electrically connected to the middle terminal of the second high-voltage coil 102, and the two terminal outlets of the second high-voltage coil 102 are electrically connected and then connected to external components. In this way, the series connection of the first high-voltage coil 101 and the second high-voltage coil 102 is achieved.

[0038] Combination Figure 1and Figure 3 , wherein the two terminal outlets of the first high-voltage coil 101 are respectively a first upper terminal outlet and a first lower terminal outlet, the lead wire led out of the first upper terminal outlet is a first lead wire 401, and the lead wire led out of the first lower terminal outlet is a second lead wire 402, the first lead wire 401 is electrically connected to the second lead wire 402, and is electrically connected to the second high-voltage coil 102 through a third lead wire 403.

[0039] The connection assembly includes a first pressure-equalizing tube 201, a second pressure-equalizing tube 202, and a third pressure-equalizing tube 203 connected in sequence, and also includes a first connector 301 for connecting the first pressure-equalizing tube 201 and the second pressure-equalizing tube 202, and a second connector 302 for connecting the second pressure-equalizing tube 202 and the third pressure-equalizing tube 203. The first lead 401 passes through the first pressure-equalizing tube 201 to reach the inside of the second pressure-equalizing tube 202, and the second lead 402 passes through the third pressure-equalizing tube 203 to reach the inside of the second pressure-equalizing tube 202. The second pressure-equalizing tube 202 is a three-way tube structure, and the first lead 401, the second lead 402, and the third lead 403 are respectively located in a pipeline in the second pressure-equalizing tube 202.

[0040] Reference Figure 4 and Figure 5 , wherein the first connecting member 301 includes an aluminum tube 3011, a contact plate 3012 disposed in the aluminum tube 3011, and a screw 3013 for connecting the aluminum tube 3011 and the contact plate 3012. The aluminum tube 3011 is provided with an internal thread, and the contact plate 3012 is threadedly connected to the inside of the aluminum tube 3011, and the number of the contact plates 3012 is at least two and is evenly distributed along the circumference of the aluminum tube 3011. In one embodiment of the present invention, the number of the contact plates 3012 is 3. Figures 3 to 5 One end of the aluminum tube 3011 is connected to the first pressure-equalizing tube 201 , and the other end is connected to the second pressure-equalizing tube 202 . The first pressure-equalizing tube 201 and the second pressure-equalizing tube 202 are electrically connected through the contact plate 3012 .

[0041] like Figure 3 As shown, the first equalizing tube 201 and the second equalizing tube 202 are mechanically and electrically connected through the first connecting piece 301, and an insulating tape is also wound around the outside of the first connecting piece 301 to enhance the connection strength between the first connecting piece 301 and the first equalizing tube 201 and the second equalizing tube 202.

[0042] Combination Figure 3 and Figure 6As shown, the second connector 302 includes a first fixing plate 3021, a second fixing plate 3022, four terminal blocks, a lead connector 3027, and an insulated connecting lead 3028. The first fixing plate 3021 and the second fixing plate 3022 are buckled together, and the cross-section of the first fixing plate 3021 and the second fixing plate 3022 perpendicular to the axial direction of the second equalizing tube 202 is arc-shaped. The first fixing plate 3021 and the second fixing plate 3022 are buckled together to form a receiving cavity, which is a cylindrical space. When the first fixing plate 3021 and the second fixing plate 3022 are buckled together, at least part of the second equalizing tube 202 and the third equalizing tube 203 are covered.

[0043] The lead connector 3027 is detachable, and the detachable connector consists of two parts, which are connected by bolts to form a whole. The lead connector 3027 includes a first part and a second part connected by bolts, wherein the first lead 401 and the third lead 403 are electrically connected to the first part, and the second lead 402 is electrically connected to the second part.

[0044] The four wiring sockets are respectively a first wiring socket 3023, a second wiring socket 3024, a third wiring socket 3025 and a fourth wiring socket 3026. The first wiring socket 3023 is fixed inside the second voltage equalizing tube 202 and is electrically connected to the second voltage equalizing tube 202, the second wiring socket 3024 is fixed inside the first fixing plate 3021 and is electrically connected to the first fixing plate 3021, the third wiring socket 3025 is fixed inside the third voltage equalizing tube 203 and is electrically connected to the third voltage equalizing tube 203, and the fourth wiring socket 3026 is fixed inside the second fixing plate 3022 and is electrically connected to the second fixing plate 3022.

[0045] The second part of the lead connector 3027, the fourth terminal block 3026, the first terminal block 3023, the second terminal block 3024 and the third terminal block 3025 are fixedly electrically connected in sequence through an insulated connecting lead 3028, so as to achieve equipotential electrical connection between the second equalizing tube 202, the second connecting piece 302 and the third equalizing tube 203. An insulating piece is also provided on the outside of the second connecting piece 302, so as to achieve fixation between the first fixing plate 3021 and the second fixing plate 3022, and to strengthen the connection strength between the second connecting piece 302 and the second equalizing tube 202 and the third equalizing tube 203.

[0046] The insulating member in the present invention includes a white cloth tape and crepe paper. Specifically, the white cloth tape is wound around the first lead, the second lead, the third lead and the lead connector in a semi-lapped 4-layer manner to achieve insulation between the lead and the voltage-equalizing tube. The crepe paper is semi-lapped around the first voltage-equalizing tube, the second voltage-equalizing tube, the third voltage-equalizing tube, the first connector and the second connector to achieve insulation between the lead and the voltage-equalizing tube, thereby achieving insulation between the voltage-equalizing tube and the transformer.

[0047] In summary, the present invention adopts a double-column series structure, the number of turns of the high-voltage coil of each column is half of the total number of turns of the high-voltage coil, the series connection potential between the high-voltage columns is 1 / 2 of the potential of the high-voltage head end, the lead potential is reduced, and the electrical insulation strength of the lead is easy to ensure. The structure of the voltage-equalizing tube plus the lead connection is adopted, the electrode shape is good, the structure is simple, the operation is convenient, and the lead insulation reliability is high. The transformer in the present invention has a small size, which solves the problems of transportation outer limit and transportation weight limitation. The lead connection structure is simple, the operation process is good, and the reliability is high.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A UHV step-up transformer with coil leads connected in series, characterized in that: include: Two core columns of coils, a first high-voltage coil wound on one core column, a second high-voltage coil wound on the other core column, and a connecting assembly for connecting the first high-voltage coil and the second high-voltage coil; The first high-voltage coil is connected in series with the second high-voltage coil; The connection assembly includes a plurality of pressure equalizing tubes connected in sequence, a connector for connecting two adjacent pressure equalizing tubes, and an insulating member wound outside the pressure equalizing tube; The lead wire between the first high-voltage coil and the second high-voltage coil is arranged inside the voltage equalizing tube; The connecting assembly includes a first pressure equalizing tube, a second pressure equalizing tube and a third pressure equalizing tube connected in sequence, a first connecting piece for connecting the first pressure equalizing tube and the second pressure equalizing tube, and a second connecting piece for connecting the second pressure equalizing tube and the third pressure equalizing tube; The two terminal outlets of the first high-voltage coil are respectively a first upper terminal outlet and a first lower terminal outlet, the lead wire led out of the first upper terminal outlet is a first lead wire, the lead wire led out of the first lower terminal outlet is a second lead wire, the first lead wire is electrically connected to the second lead wire, and is electrically connected to the second high-voltage coil through a third lead wire; The first lead passes through the first pressure-equalizing tube to reach the inside of the second pressure-equalizing tube, the second lead passes through the third pressure-equalizing tube to reach the inside of the second pressure-equalizing tube, the second pressure-equalizing tube is a three-way tube structure, and the first lead, the second lead and the third lead are respectively located in a pipe in the second pressure-equalizing tube; The second connecting member includes a first fixing plate, a second fixing plate, four wiring seats, a lead connector and an insulated connecting lead; the first fixing plate and the second fixing plate are buckled and connected, the cross-sections of the first fixing plate and the second fixing plate perpendicular to the axis direction of the second equalizing tube are arc-shaped, the first fixing plate and the second fixing plate are buckled and connected to form a accommodating cavity, and the accommodating cavity is a cylindrical space; when the first fixing plate and the second fixing plate are buckled, at least a part of the second equalizing tube and the third equalizing tube are covered; The lead connector is detachable, and includes a first part and a second part connected by bolts, the first lead and the third lead are electrically connected to the first part, and the second lead is electrically connected to the second part; The four terminal blocks are respectively a first terminal block, a second terminal block, a third terminal block and a fourth terminal block; the first terminal block is fixed inside the second voltage-equalizing tube and is electrically connected to the second voltage-equalizing tube, the second terminal block is fixed inside the first fixing plate and is electrically connected to the first fixing plate, the third terminal block is fixed inside the third voltage-equalizing tube and is electrically connected to the third voltage-equalizing tube, and the fourth terminal block is fixed inside the second fixing plate and is electrically connected to the second fixing plate; the second part of the lead connector, the fourth terminal block, the first terminal block, the second terminal block and the third terminal block are electrically connected in sequence through an insulated connecting lead.

2. The UHV step-up transformer with coil leads connected in series according to claim 1, characterized in that: The first high-voltage coil and the second high-voltage coil are of a middle-inlet structure, and the number of turns of the first high-voltage coil and the number of turns of the second high-voltage coil are equal.

3. The UHV step-up transformer with coil leads connected in series according to claim 1, characterized in that: The first high-voltage coil includes a first upper coil and a first lower coil, and the second high-voltage coil includes a second upper coil and a second lower coil; the winding directions of the first upper coil and the first lower coil are opposite, and the winding directions of the second upper coil and the second lower coil are opposite. The winding directions of the first upper coil and the second upper coil are opposite.

4. The UHV step-up transformer with coil leads connected in series according to claim 1, characterized in that: The first connecting member includes an aluminum tube, a contact plate arranged in the aluminum tube, and a screw for connecting the aluminum tube and the contact plate; the inner wall of the aluminum tube is provided with an internal thread, the contact plate is threadedly connected to the inside of the aluminum tube, the number of the contact plates is at least two, and they are evenly distributed along the circumference of the aluminum tube; One end of the aluminum tube is connected to the first pressure equalizing tube, and the other end is connected to the second pressure equalizing tube. The first pressure equalizing tube and the second pressure equalizing tube are electrically connected through the contact plate.

5. The UHV step-up transformer with coil leads connected in series according to claim 1, characterized in that: It also includes a white cloth tape and crepe paper, wherein the white cloth tape is half-folded and wound in 4 layers on the outside of the first lead, the second lead, the third lead and the lead joint; the crepe paper is half-folded and wound on the outside of the first equalizing pressure tube, the second equalizing pressure tube, the third equalizing pressure tube, the first connecting piece and the second connecting piece.

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