CN113506675A

CN113506675A - Dual ratio transformer

Info

Publication number: CN113506675A
Application number: CN202110899443.9A
Authority: CN
Inventors: 刘虹; 王仁; 杨锐斌
Original assignee: Siemens Transformer Guangzhou Co Ltd
Current assignee: Siemens Transformer Guangzhou Co Ltd
Priority date: 2021-08-06
Filing date: 2021-08-06
Publication date: 2021-10-15
Anticipated expiration: 2041-08-06
Also published as: CN113506675B

Abstract

An embodiment of the present invention provides a dual transformation ratio transformer, including: a first primary winding, a second primary winding, a first shield, a second shield, a third shield, and a connecting wire; a first primary winding and the second primary winding respectively have incoming wire joints and outgoing wire joints, the three shielding covers have three shielding spaces and two openings respectively, and the connecting wire includes two connecting heads. The inlet and outlet connectors of the first primary winding, the second primary winding, and the connector of the connecting wire realize the series and parallel connection of the first primary winding and the second primary winding through different connection methods, and the connections are all connected. It is realized in the shielded space of three shields. The three shields ensure that the electric field at the connection between the first primary winding and the second primary winding is uniform when connected in series and in parallel. Therefore, through the arrangement of the shielding case and the connection of the connecting wires, the electric field balance at the connection is ensured while realizing the series or parallel connection of the two primary windings of the dual-transformation ratio transformer.

Description

Double-transformation-ratio transformer

Technical Field

The invention relates to the technical field of electricity, in particular to a double-transformation-ratio transformer.

Background

The transformer changes alternating voltage by utilizing the principle of electromagnetic induction, is basic equipment for power transmission and distribution, and is widely applied to the fields of industry, agriculture, traffic, urban communities and the like. The double-transformation-ratio transformer can connect two windings in series or in parallel according to the change of input voltage, change the effective turns of the windings, further change the turn ratio of the primary winding and the secondary winding, and realize the adjustment of the input voltage and the output voltage ratio of the transformer. Two windings of a common double-transformation-ratio transformer are connected in series and in parallel through a conductor and a switch, so that the electric field is uneven at the joint, and the normal work of equipment is influenced.

Disclosure of Invention

In view of the above, the present invention provides a dual-ratio transformer, which at least partially solves the above technical problems.

To achieve the above object, an embodiment of the present invention provides a dual-transformation-ratio transformer, including: a first primary winding having a first incoming connection and a first outgoing connection; a second primary winding having a second incoming connection and a second outgoing connection; a first shield can configured to have a first shield space, a first opening, and a second opening; a second shield can configured to have a second shield space, a third opening, and a fourth opening; a third shield can configured to have a third shield space, a fifth opening, and a sixth opening; the connecting line comprises a first connector and a second connector; the first connecting head enters the third shielding space through the fifth opening and is electrically connected with the second wire inlet connector entering the third shielding space through the sixth opening, and the third shielding cover shields an electric field generated at the connecting position of the first connecting head and the second wire inlet connector; the first incoming connector enters the first shielded space through the first opening; the first outlet connector enters the second shielding space through the third opening;

the second connector enters the second shielding space through the fourth opening and is electrically connected with the first wire outlet connector, so that the first primary winding is connected with the second primary winding in series, and the second shielding cover shields an electric field generated at the connecting position of the second connector and the first wire outlet connector; or the second connector passes through the second opening gets into first shielding space with first inlet wire connects the electricity and connects, the second is qualified for the next round of competitions and connects to pass through the fourth opening gets into second shielding space with first outlet wire connects the electricity and connects, makes first primary winding with the second primary winding is parallelly connected, first shield cover is right the second connector with the electric field that first inlet wire connects the position to produce shields, the second shield cover is right the second is qualified for the next round of competitions connect with the electric field that first outlet wire connects the position to produce shields.

In the transformer with double transformation ratios provided by the embodiment of the invention, the first primary winding, the incoming line joint and the outgoing line joint of the second primary winding and the joint of the connecting line realize the series connection and the parallel connection of the first primary winding and the second primary winding through different connection modes, and the connection is realized in three shielding spaces of the three shielding cases. The three shielding cases ensure that the electric field at the connection part of the first primary winding and the second primary winding is uniform when the first primary winding and the second primary winding are connected in series and in parallel. Therefore, through the arrangement of the shielding cover and the connection of the connecting wire, the electric field balance at the connection position is ensured while the two primary windings of the double-transformation-ratio transformer are connected in series or in parallel.

In another implementation manner of the present invention, each of the first shield, the second shield, and the third shield includes a ring shield, the ring shield includes a plurality of rings and a plurality of connecting bars, the rings are parallel to each other and have the same size, the axes of the rings are overlapped, and the connecting bars connect the adjacent rings in the axial direction of the ring shield; the three rings of the ring shields at both ends form the first opening and the second opening, the third opening and the fourth opening, and the fifth opening and the sixth opening, respectively. In the implementation mode, the shielding cover is simple in structure and good in shielding effect.

In another embodiment of the present invention, each of the first shield cover, the second shield cover, and the third shield cover includes a spiral shield cover, and the spiral shield cover is spirally wound along a reference line; the two ends of the three spiral shielding cases are respectively provided with the first opening and the second opening, the third opening and the fourth opening, and the fifth opening and the sixth opening. In the implementation mode, the shielding cover is convenient to manufacture and good in heat dissipation performance.

In another implementation of the present invention, the first shield, the second shield, and the third shield each include a cylindrical shield; the three cylindrical shielding cases have the first opening and the second opening, the third opening and the fourth opening, and the fifth opening and the sixth opening at two ends thereof, respectively. In this implementation, the shield can not only ensure a uniform electric field, but also prevent foreign matter from entering and affecting the connection.

In another implementation of the present invention, the first shield can, the second shield can, and the third shield can each include an aluminum alloy shield can. In this implementation, the shield can is easy to manufacture and is low cost.

In another implementation of the present invention, the first shield can, the second shield can, and the third shield can each include a copper shield can. In this implementation, the shield is stronger and less prone to damage.

In another implementation manner of the present invention, the connecting line includes a copper conductor, and two ends of the copper conductor are the first connector and the second connector respectively. In this implementation, the connecting wires have lower resistance and generate less heat, which is beneficial to reducing the temperature rise of the device.

In another implementation of the present invention, the first primary winding and the second primary winding have the same number of turns. In this implementation, the effective number of turns for both windings in series and in parallel is convenient to calculate.

In another implementation of the present invention, the dual-ratio transformer includes three phases, wherein each phase includes the first primary winding, the second primary winding, the first shield, the second shield, the third shield, and the connection line. In this implementation, the dual-ratio transformer includes three phases, and the turn ratio of the three-phase windings can be adjusted as required.

In another implementation of the invention, the input voltage of the dual ratio transformer is 110 kv or 220 kv.

In this implementation, the double-ratio transformer has a wider application range in the power grid.

In another implementation of the invention, the dual-ratio transformer is a step-down transformer. In this implementation, the double-transformation-ratio transformer has fewer secondary winding turns, and the connection of the two primary sub-windings is more convenient.

In another implementation manner of the present invention, the dual-transformation-ratio transformer further includes a first voltage regulating winding and a second voltage regulating winding, the first voltage regulating winding is connected in series with the first primary winding, and the second voltage regulating winding is connected in series with the second primary winding. In this implementation, adjusting the number of turns of the voltage regulating winding can change the effective number of turns of the primary winding, thereby ensuring the stability of the output voltage when the power grid fluctuates.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the embodiments of the present invention, and it is also possible for a person skilled in the art to obtain other drawings based on these drawings.

FIG. 1 is a schematic block diagram of a dual-ratio transformer provided by an embodiment of the present invention;

FIG. 2 is a schematic block diagram of a dual-ratio transformer provided by an embodiment of the present invention with a first primary winding and a second primary winding connected in series;

FIG. 3 is a schematic block diagram of a dual-ratio transformer provided by an embodiment of the present invention with a first primary winding and a second primary winding connected in parallel;

FIG. 4 is a schematic perspective view of a shield provided by an embodiment of the present invention;

FIG. 5 is a schematic perspective view of a shield provided by an embodiment of the present invention;

FIG. 6 is a schematic perspective view of a shield provided by an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a dual-transformation-ratio transformer according to an embodiment of the present invention.

List of reference numerals:

100: a first primary winding; 110: a first service coupling; 120: a first outlet connector;

200: a second primary winding; 210: second service coupling, 220: a second outlet connector;

310: a first shield case; 311: a first shielded space; 312: a first opening; 313: a second opening;

320: a second shield case; 321: a second shielded space; 322: a third opening; 323: a fourth opening;

330: a third shield case; 331: a third shielded space; 332: a fifth opening; 333: a sixth opening;

301: a circular ring shield; 302: a circular ring; 303: a connecting strip; 304: a helical shield; 305: a cylindrical shield case;

400: a conductor; 410: a first connector; 420: a second connector.

510: a first voltage regulating winding; 520: a second voltage regulating winding; 600: a secondary winding; and 700: and (3) an iron core.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention shall fall within the scope of the protection of the embodiments of the present invention.

As shown in fig. 1 to 3, an embodiment of the present invention provides a dual-transformation-ratio transformer, including: a first primary winding 100, the first primary winding 100 having a first incoming connection 110 and a first outgoing connection 120; a second primary winding 200, the second primary winding 200 having a second incoming connector 210 and a second outgoing connector 220; a first shield can 310, the first shield can 310 being configured to have a first shield space 311, a first opening 312, and a second opening 313; a second shield can 320, the second shield can 320 being configured to have a second shield space 321, a third opening 322, and a fourth opening 323; a third shield can 330, the third shield can 330 being configured to have a third shield space 331, a fifth opening 332, and a sixth opening 333; and a connection line 400, the connection line 400 including a first connector 410 and a second connector 420; the first connector 410 enters the third shielding space 331 through the fifth opening 332 and is electrically connected with the second incoming connector 210 entering the third shielding space 331 through the sixth opening 333, and the third shielding case 330 shields an electric field generated at a connecting position of the first connector 410 and the second incoming connector 210; the first incoming connector 110 enters the first shielded space 311 through the first opening 312; the first outlet terminal 120 enters the second shielding space 321 through the third opening 322;

the second connector 420 enters the second shielding space 321 through the fourth opening 322 to be electrically connected with the first outlet connector 120, so that the first primary winding 100 and the second primary winding 200 are connected in series, and the second shielding case 320 shields an electric field generated at a connecting position of the second connector 420 and the first outlet connector 120; or the second connector 420 enters the first shielding space 311 through the second opening 313 to be electrically connected with the first wire inlet connector 110, the second wire outlet connector 220 enters the second shielding space 321 through the fourth opening 323 to be electrically connected with the first wire outlet connector 120, so that the first primary winding 100 and the second primary winding 200 are connected in parallel, the first shielding case 310 shields an electric field generated at a connecting position of the second connector 420 and the first wire inlet connector 110, and the second shielding case 320 shields an electric field generated at a connecting position of the second wire outlet connector 220 and the first wire outlet connector 120.

In the dual-transformation-ratio transformer provided by the embodiment of the invention, the incoming line joints and outgoing line joints of the first primary winding 100 and the second primary winding 200, and the joints of the connecting line 400 realize the series connection and parallel connection of the first primary winding 100 and the second primary winding 200 through different connection modes, and the connection is realized in the shielding space of three shielding cases. The three shields ensure a uniform electric field at the junction of the first primary winding 100 and the second primary winding 200 in series and parallel. Therefore, through the arrangement of the shielding cover and the connection of the connecting wire, the electric field balance at the connection part is ensured while the two primary windings of the double-transformation-ratio transformer are connected in series or in parallel.

It should be noted that fig. 1-3 are only schematic structural diagrams of the dual-ratio transformer, and the positional relationship among the first shield can 310, the second shield can 320 and the third shield can 330 is not intended to limit the structure of the dual-ratio transformer. In practical application, the three shielding cases can be arranged at will, and the connection and installation are convenient.

For ease of installation and series-parallel switching, a dual-ratio transformer may be provided in the manner shown in fig. 7: the iron core 700, the secondary winding 600, and the two

primary windings

100 and 200 are arranged in sequence from inside to outside. Thus, the connection of the two primary windings and the connecting wire in the shield case is performed outside the transformer and is not affected by the core 700 and the secondary winding 600.

Optionally, the wire inlet joint and the wire outlet joint, and the wire inlet joint and the wire outlet joint and the connecting joint of the connecting wire are connected through bolts. The bolt connection mode is simple and reliable, and the contact resistance is smaller.

As shown in fig. 4, in another implementation of the present invention, each of the first shield can 310, the second shield can 320, and the third shield can 330 includes a circular shield can 301, the circular shield can 301 includes a plurality of circular rings 302 and a plurality of connecting bars 303, the circular rings 302 are parallel to each other and have the same size, the axes of the circular rings 302 are overlapped, and the connecting bars 303 connect adjacent circular rings 302 in the axial direction of the circular shield can 301; the rings 302 of the three ring shields 301 at both ends form a first opening 312 and a second opening 313, a third opening 322 and a fourth opening 323, and a fifth opening 332 and a sixth opening 333, respectively. The shielding case has simple structure and good shielding effect.

Optionally, one of the connecting strips of the shielding case has an extension portion extending toward an axis of the shielding case, and the shielding case can be fixed by the extension portion and the wire inlet/outlet connector or the connecting head therein. For example, when the wire inlet and outlet connectors and the connectors of the wire inlet and outlet connectors and the connecting wires are connected through bolts, the extending portion is provided with a through hole near the axis of the shielding ring, so that the extending portion can be fixed to the bolt connection.

As shown in fig. 5, in another implementation of the present invention, each of the first shield can 310, the second shield can 320, and the third shield can 330 includes a spiral shield can 304, and the spiral shield can 304 has a spiral shape surrounding along a reference line; the three helical shields 304 have first and

second openings

312 and 313, third and

fourth openings

322 and 323, and fifth and

sixth openings

332 and 333 at opposite ends, respectively. The shielding cover is convenient to manufacture and good in heat dissipation performance.

As shown in fig. 6, in another implementation of the present invention, the first shield can 310, the second shield can 320, and the third shield can 330 each include a cylindrical shield can 305; the three cylindrical shields 305 have first and

second openings

312 and 313, third and

fourth openings

322 and 323, and fifth and

sixth openings

332 and 333 at both ends, respectively. The shielding cover can not only ensure the uniformity of the electric field, but also prevent foreign matters from entering to influence the connection.

Optionally, the first shield can 310, the second shield can 320 and the third shield can 330 each include an aluminum alloy shield can. The shielding case is easy to manufacture and low in cost.

Optionally, the first shield can 310, the second shield can 320 and the third shield can 330 each comprise a copper shield can. The shielding cover has higher strength and is not easy to deform and damage.

In another implementation of the present invention, the connection line 400 includes a copper conductor, and the two ends of the copper conductor are a first connection head 410 and a second connection head 420 respectively. In this implementation, the connecting wires have lower resistance and generate less heat, which is beneficial to reducing the temperature rise of the device.

In another implementation of the present invention, the first primary winding 100 and the second primary winding 200 have the same number of turns. In this implementation, the effective number of turns for both windings in series and in parallel is convenient to calculate. The effective number of turns in parallel is a single primary winding number of turns, and the effective number of turns in series is twice the single primary winding number of turns. The effective turn number of the two primary windings in series connection and parallel connection is convenient to calculate. That is, the input voltage of the dual-transformation-ratio transformer when the two primary windings are connected in series is twice the input voltage when the two primary windings are connected in parallel, for example, the input voltage is 20 kv when the two primary windings are connected in series, and the input voltage is 10 kv when the two primary windings are connected in parallel, and the input voltage of the dual-transformation-ratio transformer is not specifically limited herein.

In another implementation of the present invention, the dual-ratio transformer includes three phases, wherein each phase includes the first primary winding 100, the second primary winding 200, the first shield can 310, the second shield can 320, the third shield can 330, and the connection line 400, respectively. In this implementation, the dual-ratio transformer includes three phases, and the turn ratios of the three-phase windings can be adjusted as desired.

Wherein the total nine shield covers of three-phase can set up in the same one side of three-phase transformer, also can set up the three shield cover of every looks respectively in every looks's near, also can set up the shield cover of two items in the outside respectively in two outsides, and the shield cover of mesophase sets up one side wherein.

In another implementation of the invention, the input voltage of the dual ratio transformer is 110 kv or 220 kv. That is, the input voltage of the two primary windings of the double-ratio transformer is 220 kv when they are connected in series, and 110 kv when they are connected in parallel. The output voltages of the two input voltages are the same, and the output voltage of the double-transformation-ratio transformer is not specifically limited herein. The 110 kilovolts and 220 kilovolts are common transmission voltages in the power grid, so that the application range of the double-transformation-ratio transformer in the power grid is wider when the input voltage of the double-transformation-ratio transformer is 110 kilovolts or 220 kilovolts, and the product popularization is facilitated.

In another implementation of the invention, the dual-ratio transformer is a step-down transformer. In the step-down transformer, the number of turns of the secondary winding is obviously less than that of the primary winding, and the number of turns of the secondary winding of the double-transformation-ratio transformer is less, so that the connection of the two primary sub-windings is more convenient.

As shown in fig. 7, in another implementation of the present invention, the dual-ratio transformer further includes a first regulating winding 510 and a second regulating winding 520, the first regulating winding 510 is connected in series with the first primary winding 100, and the second regulating winding 520 is connected in series with the second primary winding 200. In practical application, the power grid often has small fluctuation, and the output voltage is unstable due to input voltage change. In the implementation mode, the number of turns of the voltage regulating winding can be adjusted according to the change of the input voltage, and the number of turns of the voltage regulating winding can change the effective number of turns of the primary winding, so that the stability of the output voltage is ensured when the power grid fluctuates.

The two voltage regulating windings can be further arranged on the outer sides of the two primary windings, and connection and adjustment are facilitated. Optionally, the two voltage regulating windings are respectively matched with the two primary sub-windings in the height direction, and do not exceed the upper and lower ends of the two primary windings in the height direction. The arrangement mode enables the double-transformation-ratio transformer not to generate extra leakage magnetic field due to the voltage regulating winding, so that the unbalanced ampere turn condition is avoided, and the increase of eddy current loss is avoided.

The above embodiments and implementations are merely specific illustrations of possible embodiments of the invention, and should not be construed as limiting the scope of the invention. All equivalents and modifications of the technical spirit of the present invention, such as division and rearrangement of features, are included in the scope of the present invention.

Claims

1. a dual ratio transformer, is characterized in that, comprises:

a first primary winding (100), the first primary winding (100) having a first incoming wire connector (110) and a first outgoing wire connector (120);

a second primary winding (200), the second primary winding (200) has a second incoming wire connector (210) and a second outgoing wire connector (220);

a first shielding case (310), the first shielding case (310) is configured to have a first shielding space (311), a first opening (312) and a second opening (313);

a second shielding case (320) configured to have a second shielding space (321), a third opening (322) and a fourth opening (323);

a third shielding case (330) configured to have a third shielding space (331), a fifth opening (332) and a sixth opening (333); and

a connecting wire (400), the connecting wire (400) includes a first connecting head (410) and a second connecting head (420);

Wherein, the first connector (410) enters the third shielding space (331) through the fifth opening (332) and enters the third shielding space (331) through the sixth opening (333) The second inlet connector (210) is electrically connected, and the third shield (330) performs the electric field generated by the connection position between the first connector (410) and the second inlet connector (210). shielding; the first wire inlet connector (110) enters the first shielding space (311) through the first opening (312); the first wire outlet connector (120) passes through the third opening (322) enter the second shielded space (321);

The second connector (420) enters the second shielding space (321) through the fourth opening (322) and is electrically connected to the first outlet connector (120), so that the first primary winding ( 100) is connected in series with the second primary winding (200), and the second shield (320) performs the electric field generated at the connection position of the second connector (420) and the first outlet connector (120). shielding; or the second connector (420) enters the first shielding space (311) through the second opening (313) and is electrically connected to the first inlet connector (110), and the second outlet The connector (220) enters the second shielding space (321) through the fourth opening (323) and is electrically connected to the first outlet connector (120), so that the first primary winding (100) and the The second primary winding (200) is connected in parallel, the first shielding cover (310) shields the electric field generated at the connection position between the second connection head (420) and the first incoming wire connection (110), and the The second shielding cover (320) shields the electric field generated at the connection position of the second outlet connector (220) and the first outlet connector (120).

2. The dual ratio transformer according to claim 1, wherein the first shield (310), the second shield (320) and the third shield (330) each comprise one A circular shielding cover (301), the circular shielding cover (301) includes a plurality of circular rings (302) and a plurality of connecting bars (303), and the plurality of the circular rings (302) are parallel to each other and have the same size. The axes of the two circular rings (302) are coincident, and the connecting bars (303) connect the adjacent circular rings (302) in the axial direction of the circular shielding cover (301); The circular rings (302) at both ends of the ring shield (301) respectively form the first opening (312) and the second opening (313), the third opening (322) and the fourth opening (323) and The fifth opening (332) and the sixth opening (333).

3. The dual ratio transformer according to claim 1, wherein the first shield (310), the second shield (320) and the third shield (330) each comprise one A spiral shielding cover (304), the spiral shielding cover (304) is in a spiral shape surrounding a reference line; two ends of the three spiral shielding covers (304) are respectively provided with the first opening (312) and the first opening (312) and the third spiral shielding cover (304). The second opening (313), the third opening (322) and the fourth opening (323), and the fifth opening (332) and the sixth opening (333).

4. The dual ratio transformer according to claim 1, wherein the first shield (310), the second shield (320) and the third shield (330) each comprise one A cylindrical shield (305); the two ends of the three cylindrical shields (305) respectively have the first opening (312) and the second opening (313), the third opening (322) and the fourth opening (323) and the fifth opening (332) and the sixth opening (333).

5. The dual ratio transformer according to any one of claims 1 to 4, wherein the first shield (310), the second shield (320) and the third shield (330) respectively include an aluminum alloy shield.

6. The dual ratio transformer according to any one of claims 1 to 4, wherein the first shield (310), the second shield (320) and the third shield (330) each include a copper shield.

7 . The dual ratio transformer according to claim 1 , wherein the connecting wire ( 400 ) comprises a copper conductor, and two ends of the copper conductor are the first connecting head ( 410 ) and the The second connector (420).

8. The dual ratio transformer according to claim 1, characterized in that the first primary winding (100) and the second primary winding (200) have the same number of turns.

9. The dual transformation ratio transformer according to claim 1, wherein the dual transformation ratio transformer comprises three phases, wherein each phase comprises the first primary winding (100), the second primary winding A winding (200), the first shielding cover (310), the second shielding cover (320), the third shielding cover (330), and the connecting wire (400).

10 . The dual transformation ratio transformer according to claim 1 , wherein the input voltage of the dual transformation ratio transformer is 110 kV or 220 kV. 11 .

11 . The dual ratio transformer according to claim 1 , wherein the dual ratio transformer is a step-down transformer. 12 .

12. The dual transformation ratio transformer according to claim 1, wherein the dual transformation ratio transformer further comprises a first voltage regulation winding (510) and a second voltage regulation winding (520), the first voltage regulation winding The winding (510) is connected in series with the first primary winding (100), and the second voltage regulating winding (520) is connected in series with the second primary winding (200).