High-impedance rectification phase-shifting transformer

Abstract

The utility model provides a high-impedance rectification phase-shifting transformer, which relates to the technical field of transformers and comprises a main body, a coil winding and a magnetic leakage sheet. The main body comprises an iron core, and the iron core comprises three core columns which are arranged in parallel; the coil winding is divided into three coil groups, the three coil groups are respectively wound on the three core columns, each coil group comprises a primary winding and a secondary winding, the primary winding is wound on the core column, and the secondary winding is wound on the primary winding; and the magnetic leakage sheet is arranged between the primary winding and the secondary winding. By arranging the magnetic leakage sheets between the primary winding and the secondary winding, high-impedance rectification phase-shift transformation is realized. The impedance of the transformer can be effectively improved by arranging the magnetic leakage sheet, the harmonic wave of the input current of the rectification circuit can be better eliminated through the higher impedance, and the pollution of the harmonic current to a power grid is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to a high-impedance rectifier phase-shifting transformer. Background Art

[0002] With the rapid development of my country's economy, more and more transformers are used in various fields. Rectification conversion, as one of the most commonly used power conversion, has been widely used in various fields such as DC motors, electroplating, new energy, and aerospace. However, the strong nonlinearity of rectifier devices brings a lot of harmonic pollution to the power grid. In the practice of high-power rectifier engineering, LC filtering, power factor correction, PWM rectification and multi-pulse rectification are mainly used to control harmonics.

[0003] Among them, the multi-pulse rectification technology with the characteristics of high harmonic suppression rate, low noise, low electromagnetic interference and radio frequency interference, simple implementation and high reliability is the most widely used. With the development of multi-pulse rectification technology, the number of pulses in the rectification system has increased, and the total harmonic distortion (THD) of the power grid has been effectively controlled. Among the existing rectifier transformers, the 24-pulse rectifier transformer is widely used, but the existing 24-pulse rectifier transformer still has the problem of insufficient harmonic suppression ability. Utility Model Content

[0004] In order to overcome the problems existing in the related art, the purpose of the utility model is to provide a high-impedance rectifier phase-shifting transformer to solve the problem of insufficient harmonic suppression capability in the prior art.

[0005] A high impedance rectifier phase-shifting transformer, comprising:

[0006] Main body, coil winding, leakage magnetic sheet.

[0007] The main body comprises an iron core, and the iron core comprises three core columns arranged parallel to each other;

[0008] The coil winding is divided into three coil groups, and the three coil groups are respectively wound on the three core columns, and each coil group includes a primary winding and a secondary winding, the primary winding is wound on the core column, and the secondary winding is wound on the primary winding; along the height direction of the core column, the secondary winding of each coil group includes a first-stage phase-shifting coil, a second-stage phase-shifting coil, a third-stage phase-shifting coil, and a fourth-stage phase-shifting coil arranged from top to bottom;

[0009] The magnetic leakage sheet is arranged between the primary winding and the secondary winding.

[0010] The input three-phase electricity is converted into 24-pulse output through the four-stage phase-shifting coils of the three coil groups, and a leakage magnetic sheet is set between the primary winding and the secondary winding to achieve high-impedance rectification phase-shifting transformation. The impedance of the transformer can be effectively increased by setting the leakage magnetic sheet. With higher impedance, the harmonics of the input current of the rectifier circuit can be better eliminated, effectively reducing the pollution of harmonic current to the power grid.

[0011] In a preferred technical solution of the utility model, the leakage magnetic sheet is a rectangular parallelepiped, and the leakage magnetic sheet includes a plurality of magnetic conductive sheets, and the plurality of magnetic conductive sheets are flatly arranged along the length direction of the leakage magnetic sheet, a first insulating plate is arranged between adjacent magnetic conductive sheets, and the second insulating plate is arranged on both sides of the leakage magnetic sheet.

[0012] The magnetic conductive sheet absorbs part of the leakage inductance of the transformer, and the first insulating plate separates adjacent magnetic conductive sheets to prevent the transformer from overheating. The second insulating plates on both sides of the leakage magnetic sheet can effectively prevent the magnetic conductive sheet from contacting the coil winding while fixing the magnetic conductive sheet and the first insulating plate, thereby ensuring the normal operation of the leakage magnetic sheet.

[0013] In a preferred technical solution of the utility model, the magnetic leakage sheet is arranged between two adjacent coil groups.

[0014] By arranging the leakage magnetic sheet between two adjacent coil groups, the leakage inductance of the two adjacent coil groups can be absorbed at the same time, thereby effectively improving the utilization efficiency of the leakage magnetic sheet.

[0015] In a preferred technical solution of the utility model, the primary winding further comprises a ventilation slot, the ventilation slot is arranged in the width direction of the primary winding, and two ventilation slots are symmetrically arranged along the center of the core column;

[0016] Each of the coil groups further includes a ventilation gap, which is arranged between the primary winding and the secondary winding. Four ventilation gaps are provided, and the four ventilation gaps are respectively arranged parallel to the four sides of the core column.

[0017] By providing ventilation slots in the primary winding and ventilation gaps between the primary winding and the secondary winding, the contact area between the coil winding and the air is increased, and the heat of the coil winding is taken away by the flow of air, which can effectively improve the heat dissipation capacity of the transformer.

[0018] In a preferred technical solution of the utility model, three magnetic leakage sheets are provided, and the three magnetic leakage sheets are respectively arranged in the ventilation gaps.

[0019] In a preferred technical solution of the present utility model, the primary winding and the secondary winding are windings connected in a triangle manner.

[0020] In a preferred technical solution of the utility model, the first-stage phase-shifting coil is a coil connected by the Dd-22.5 degree connection method; the second-stage phase-shifting coil is a coil connected by the Dd-7.5 degree connection method; the third-stage phase-shifting coil is a coil connected by the Dd7.5 degree connection method; and the fourth-stage phase-shifting coil is a coil connected by the Dd22.5 degree connection method.

[0021] In a preferred technical solution of the utility model, the main body further comprises a first clamp group and a second clamp group;

[0022] The first clamp group and the second clamp group are respectively arranged on two opposite sides of the iron core. The first clamp group and the second clamp group each include two clamps, and the two clamps are respectively arranged at both ends of the iron core in the height direction, and each of the clamps is fixedly connected to the iron core.

[0023] In a preferred technical solution of the utility model, the second clamp group further includes an output plate, two ends of the output plate are respectively connected to the two clamps, three output plates are arranged in parallel, and each output plate corresponds to one of the stems, and each output plate is provided with four wiring terminals, which are used to connect the output circuit;

[0024] The first fixture set also includes an input board, which is fixed on one of the clamps. Three conductive sheets are arranged on the input board, and the conductive sheets are used to connect the input circuit.

[0025] The beneficial effects of the utility model are:

[0026] The utility model provides a high-impedance rectifier phase-shifting transformer, which includes: a main body, a coil winding, and a leakage magnetic sheet. The main body includes an iron core, and the iron core includes three core columns arranged in parallel with each other; the coil winding is divided into three coil groups, and the three coil groups are respectively wound on the three core columns, and each coil group includes a primary winding and a secondary winding, the primary winding is wound on the core column, and the secondary winding is wound on the primary winding; along the height direction of the core column, the secondary winding of each coil group includes a first-stage phase-shifting coil, a second-stage phase-shifting coil, a third-stage phase-shifting coil, and a fourth-stage phase-shifting coil arranged from top to bottom; the leakage magnetic sheet is arranged between the primary winding and the secondary winding. The transformer claimed for protection in this application converts the input three-phase electricity into 24 pulse outputs through the four-stage phase-shifting coils of the three coil groups, and a leakage magnetic sheet is arranged between the primary winding and the secondary winding to realize high-impedance rectifier phase-shifting transformer. Furthermore, by providing the leakage magnetic sheet, the impedance of the transformer can be effectively increased. With the higher impedance, the harmonics of the input current of the rectifier circuit can be better eliminated, and the pollution of the harmonic current to the power grid can be effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of a high impedance rectifier phase-shifting transformer provided in an embodiment of the utility model;

[0028] Figure 2 is a three-dimensional diagram of a high-impedance rectifier phase-shifting transformer provided in an embodiment of the utility model;

[0029] Figure 3 is a schematic diagram of a magnetic leakage sheet provided in an embodiment of the utility model;

[0030] Figure 4 is a cross-sectional view of a high-impedance rectifier phase-shifting transformer provided in an embodiment of the utility model;

[0031] Figure 5 It is a partial schematic diagram of the host and the clamp provided in the embodiment of the utility model;

[0032] Figure 6 is an electrical connection diagram of the inner winding provided in the embodiment of the utility model;

[0033] Figure 7 It is an electrical connection diagram of the outer winding provided in the embodiment of the utility model.

[0034] Reference numerals:

[0035] 100, main body; 110, iron core; 120, core column; 200, coil winding; 300, coil group; 310, primary winding; 311, ventilation slot; 320, secondary winding; 321, first-stage phase-shifting coil; 322, second-stage phase-shifting coil; 323, third-stage phase-shifting coil; 324, fourth-stage phase-shifting coil; 330, ventilation gap; 400, magnetic leakage sheet; 410, magnetic conductive sheet; 420, first insulating plate; 430, second insulating plate; 500, clamp; 600, output plate; 700, input plate. DETAILED DESCRIPTION

[0036] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0037] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "the" and "the" used in the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0038] It should be understood that although the terms "first", "second", "third", etc. may be used to describe various information in the present invention, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0039] Example 1

[0040] like Figure 1-Figure 5 As shown, this embodiment provides a high impedance rectifier phase-shifting transformer, and the high impedance rectifier phase-shifting transformer includes:

[0041] The main body 100, the coil winding 200, and the magnetic leakage sheet 400. The main body 100 includes an iron core 110, and the shape of the iron core 110 is a Japanese character, and the iron core 110 includes three core columns 120 arranged parallel to each other.

[0042] The coil winding 200 is divided into three coil groups 300 , which are respectively wound on three core columns 120 . Each coil group 300 includes a primary winding 310 and a secondary winding 320 . The primary winding 310 is wound on the core column 120 , and the secondary winding 320 is wound on the primary winding 310 .

[0043] Along the height direction of the core column 120 , the secondary winding 320 of each coil group 300 includes a first-stage phase-shift coil 321 , a second-stage phase-shift coil 322 , a third-stage phase-shift coil 323 and a fourth-stage phase-shift coil 324 arranged from top to bottom; the magnetic leakage sheet 400 is arranged between the primary winding 310 and the secondary winding 320 .

[0044] The input three-phase electricity is converted into 24 pulse output through the four-stage phase-shifting coils of the three coil groups 300, and a leakage magnetic sheet 400 is arranged between the primary winding 310 and the secondary winding 320 to realize high-impedance rectification phase-shifting transformation. The impedance of the transformer can be effectively increased by arranging the leakage magnetic sheet 400. With a higher impedance, the harmonics of the input current of the rectifier circuit can be better eliminated, and the pollution of the harmonic current to the power grid can be effectively reduced.

[0045] Specifically, the role of the magnetic leakage sheet 400 may be equivalent to that of an inductor.

[0046] More specifically, the leakage magnetic sheet 400 is used to absorb part of the leakage inductance of the transformer, thereby improving the overall impedance of the transformer.

[0047] More specifically, the magnetic leakage sheet 400 may be in any shape, such as an arc shape, a circular ring shape, and a trapezoidal shape.

[0048] In this embodiment, the leakage magnetic sheet 400 is a rectangular parallelepiped, and the leakage magnetic sheet 400 includes a plurality of magnetic conductive sheets 410, and the plurality of magnetic conductive sheets 410 are flatly arranged along the length direction of the leakage magnetic sheet 400, and a first insulating plate 420 is provided between adjacent magnetic conductive sheets 410, and the second insulating plate 430 is provided on both sides of the leakage magnetic sheet 400.

[0049] The magnetic conductive sheet 410 absorbs part of the leakage inductance of the transformer, and the first insulating plate 420 separates adjacent magnetic conductive sheets 410 to prevent the transformer from overheating. The second insulating plates 430 on both sides of the leakage magnetic sheet 400 can effectively prevent the magnetic conductive sheet 410 from contacting the coil winding 200 while fixing the magnetic conductive sheet 410 and the first insulating plate 420, thereby ensuring the normal operation of the leakage magnetic sheet 400.

[0050] Specifically, the magnetic leakage sheet 400 may be disposed on any side of the coil assembly 300 .

[0051] In this embodiment, the magnetic leakage sheet 400 is disposed between two adjacent coil groups 300 .

[0052] By disposing the magnetic leakage sheet 400 between two adjacent coil groups 300 , the leakage inductance of the two adjacent coil groups 300 can be absorbed at the same time, thereby effectively improving the utilization efficiency of the magnetic leakage sheet 400 .

[0053] In this embodiment, the magnetic conductive sheet 410 is a silicon steel sheet, the first insulating plate 420 is a GPO-3 plate, and the second insulating plate 430 is an epoxy plate.

[0054] Specifically, the silicon steel sheet used as the material of the magnetic conductive sheet 410 has good magnetic conductivity and low magnetic permeability, and can effectively control the propagation of the magnetic field and reduce magnetic flux leakage.

[0055] More specifically, the GPO-3 board is a glass fiber reinforced polyester board with excellent electrical insulation performance and mechanical strength. Using it as the first insulating board 420 can effectively isolate and protect the primary winding 310, and has good heat resistance and chemical resistance, and can be used in high temperature and harsh environments.

[0056] More specifically, epoxy board has excellent mechanical properties and heat resistance. Using it as the second insulating board 430 can provide additional insulation protection and help stabilize the structure of the secondary winding 320 to prevent short circuits or arcs between windings.

[0057] In this embodiment, the primary winding 310 further includes a ventilation slot 311, and the ventilation slot 311 is arranged in the width direction of the primary winding 310, and two ventilation slots 311 are symmetrically arranged along the center of the core column 120;

[0058] Each of the coil groups 300 further includes a ventilation gap 330 , which is disposed between the primary winding 310 and the secondary winding 320 . There are four ventilation gaps 330 , which are respectively disposed parallel to four sides of the core column 120 .

[0059] By providing a ventilation slot 311 in the primary winding 310 and a ventilation gap 330 between the primary winding 310 and the secondary winding 320, the contact area between the coil winding 200 and the air is increased, and the heat of the coil winding 200 is taken away by the flow of air, which can effectively improve the heat dissipation capacity of the transformer.

[0060] Specifically, the ventilation slot 311 is a rectangular slot.

[0061] More specifically, the ventilation slot 311 passes through the primary winding 310 from top to bottom.

[0062] More specifically, three or four leakage magnetic sheets 400 may be provided, and each coil group 300 shares one leakage magnetic sheet 400 . Alternatively, several leakage magnetic sheets 400 may be provided, and each secondary winding 320 corresponds to one or more leakage magnetic sheets 400 .

[0063] In this embodiment, three magnetic leakage sheets 400 are provided, and the three magnetic leakage sheets 400 are respectively disposed in the ventilation gaps 330 .

[0064] Specifically, the primary winding 310 may be connected in a delta connection or a star connection.

[0065] In this embodiment, the primary winding 310 and the secondary winding 320 are both windings connected in a delta connection.

[0066] Specifically, the primary windings 310 of the three coil groups 300 are divided into three phases R, S, and T in sequence, with one end of the R phase connected to the S phase and the other end connected to the T phase, one end of the S phase connected to the R phase and the other end connected to the T phase, and one end of the T phase connected to the S phase and the other end connected to the R phase.

[0067] In this embodiment, the first-stage phase-shift coil 321 is a coil connected by the Dd-22.5 degree connection method; the second-stage phase-shift coil 322 is a coil connected by the Dd-7.5 degree connection method; the third-stage phase-shift coil 323 is a coil connected by the Dd7.5 degree connection method; and the fourth-stage phase-shift coil 324 is a coil connected by the Dd22.5 degree connection method.

[0068] More specifically, the secondary windings 320 of the three coil groups 300 are divided into three phases U, V, and W in sequence, with one end of the U phase connected to the W phase and the other end connected to the W phase, one end of the V phase connected to the U phase and the other end connected to the W phase, and one end of the W phase connected to the V phase and the other end connected to the U phase.

[0069] More specifically, Dd refers to the secondary coil using a triangle connection method, the degree in the brackets refers to the degree of phase shift, the phase shift angle between each level of the four-level phase-shift coil differs by 15 degrees, and the phase shift angle of the three groups of primary coils differs by 120 degrees, forming a 24-pulse output.

[0070] In this embodiment, the main body 100 further includes a first clamp group and a second clamp group;

[0071] The first clamp group and the second clamp group are respectively arranged on two opposite sides of the iron core 110, and the first clamp group and the second clamp group each include two clamps 500, and the two clamps 500 are respectively arranged at the two ends of the iron core 110 in the height direction, and each of the clamps 500 is fixedly connected to the iron core 110.

[0072] The transformer can be stably connected to other devices by the first clamp group and the second clamp group that are arranged opposite to each other.

[0073] In this embodiment, the second clamp group further includes an output plate 600, two ends of which are respectively connected to the two clamps 500, three output plates 600 are arranged in parallel, and each output plate 600 corresponds to one of the stems 120, and each output plate 600 is provided with four wiring terminals, which are used to connect the output circuit;

[0074] The first fixture set further includes an input board 700 , which is fixed on one of the clamps 500 . The input board 700 is provided with three conductive sheets, which are used to connect the input circuit.

[0075] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A high impedance rectifier phase-shifting transformer, characterized in that: include: A main body (100), the main body (100) comprising an iron core (110), the iron core (110) comprising three core columns (120) arranged parallel to each other; A coil winding (200), wherein the coil winding (200) is divided into three coil groups (300), the three coil groups (300) are respectively wound on three core columns (120), each coil group (300) comprises a primary winding (310) and a secondary winding (320), the primary winding (310) is wound on the core column (120), and the secondary winding (320) is wound on the primary winding (310); along the height direction of the core column (120), the secondary winding (320) of each coil group (300) comprises a first-stage phase shifting coil (321), a second-stage phase shifting coil (322), a third-stage phase shifting coil (323), and a fourth-stage phase shifting coil (324) arranged from top to bottom; A magnetic leakage sheet (400), wherein the magnetic leakage sheet (400) is arranged between the primary winding (310) and the secondary winding (320).

2. The high impedance rectifier phase-shifting transformer according to claim 1, characterized in that: The magnetic leakage sheet (400) is a rectangular parallelepiped, and comprises a plurality of magnetic conductive sheets (410). The plurality of magnetic conductive sheets (410) are arranged flat along the length direction of the magnetic leakage sheet (400), a first insulating plate (420) is arranged between adjacent magnetic conductive sheets (410), and second insulating plates (430) are arranged on both sides of the magnetic leakage sheet (400).

3. The high impedance rectifier phase-shifting transformer according to claim 2, characterized in that: The magnetic leakage sheet (400) is arranged between two adjacent coil groups (300).

4. The high impedance rectifier phase-shifting transformer according to claim 3, characterized in that: The primary winding (310) further comprises a ventilation slot (311), wherein the ventilation slot (311) is arranged in the width direction of the primary winding (310), and two ventilation slots (311) are symmetrically arranged along the center of the core column (120); Each of the coil groups (300) further comprises a ventilation gap (330), wherein the ventilation gap (330) is arranged between the primary winding (310) and the secondary winding (320), and four ventilation gaps (330) are provided, and the four ventilation gaps (330) are respectively arranged parallel to the four side surfaces of the core column (120).

5. The high impedance rectifier phase-shifting transformer according to claim 4, characterized in that: The magnetic leakage sheets (400) are provided with three sheets, and the three magnetic leakage sheets (400) are respectively arranged in the ventilation gaps (330).

6. The high impedance rectifier phase-shifting transformer according to claim 5, characterized in that: The primary winding (310) and the secondary winding (320) are both windings connected in a delta connection method.

7. The high impedance rectifier phase-shifting transformer according to claim 6, characterized in that: The first-stage phase shifting coil (321) is a coil connected by a Dd-22.5 degree connection method; The second-stage phase shifting coil (322) is a coil connected by a Dd-7.5 degree connection method; The third-stage phase shifting coil (323) is a coil connected by a Dd7.5 degree connection method; The fourth-stage phase shifting coil (324) is a coil connected by a Dd22.5 degree connection method.

8. The high impedance rectifier phase-shifting transformer according to claim 7, characterized in that: The main body (100) further comprises a first clamp group and a second clamp group; The first clamp group and the second clamp group are respectively arranged on two opposite sides of the iron core (110), and the first clamp group and the second clamp group each include two clamps (500), and the two clamps (500) are respectively arranged at two ends of the iron core (110) in a height direction, and each of the clamps (500) is fixedly connected to the iron core (110).

9. The high impedance rectifier phase-shifting transformer according to claim 8, characterized in that: The second clamp group further comprises an output plate (600), two ends of the output plate (600) are respectively connected to the two clamps (500), three output plates (600) are arranged in parallel, and each output plate (600) corresponds to one of the core columns (120), and each output plate (600) is provided with four wiring terminals, which are used to connect the output circuit; The first clamp group further comprises an input board (700), the input board (700) is fixed on one of the clamps (500), and three conductive sheets are arranged on the input board (700), and the conductive sheets are used to connect the input circuit.

Images