A 108-pulse phase-shifted rectifier transformer for high-power frequency converters

Abstract

The present invention provides a 108-pulse phase-shifting rectifier transformer for high-power frequency converters, belonging to the technical field of transformers. The 108-pulse phase-shifting rectifier transformer for high-power frequency converters provided by the present invention comprises a transformer tank, a first transformer body and a second transformer body. The first transformer body and the second transformer body are arranged in parallel in the transformer tank. The high-voltage side of the first transformer body adopts a star connection and is three-split, and the low-voltage side adopts a multi-winding extended delta connection and is nine-split. The first transformer body is provided with a first iron core, a first high-voltage winding and a first low-voltage winding. The high-voltage side of the second transformer body adopts a delta connection and is three-split, and the low-voltage side adopts a multi-winding extended delta connection and is nine-split. A second iron core, a second high-voltage winding and a second low-voltage winding are arranged inside the second transformer body. The 108-pulse phase-shifting rectifier transformer for high-power frequency converters provided by the present invention greatly reduces the harmonic current fed back by the rectifier to the power grid, and has a positive effect on improving the power grid environment.

Description

Technical Field

[0001] The present invention belongs to the technical field of transformers, and particularly relates to a 108-pulse phase-shifting rectifier transformer for high-power frequency converters. Background Art

[0002] With the continuous development and progress of power electronics technology, AC speed regulation drives, especially high-performance variable frequency speed regulation drives, have developed rapidly. In order to convert an AC power supply into a DC power supply, a rectifier circuit is usually composed of a rectifier transformer and a rectifier. The rectifier transformer is a device that provides a multi-phase rectified power supply for medium and high-voltage frequency converters and is an important part of variable frequency speed regulation drives. During the rectification process, the harmonics generated during the operation of the rectifier will distort the grid voltage and seriously affect the grid quality. The rectifier transmits a large amount of harmonic current to the grid, and the rectifier transformer is used to cancel the harmonics. By phase-shifting the high-voltage side of the rectifier transformer, low-order harmonics with larger amplitudes can be basically eliminated. However, the existing phase-shifting rectifier transformers have a small number of pulses and a relatively high harmonic current on the grid side, resulting in poor power quality of the grid. Therefore, the number of phase-shifting rectifier transformers is often increased to achieve a rectified output with a high number of pulses, which occupies a large area and has a high project cost. Summary of the Invention

[0003] The purpose of the present invention is to provide a 108-pulse phase-shifting rectifier transformer for high-power frequency converters, aiming to solve the problems of the existing phase-shifting rectifier transformers having a small number of pulses, a relatively high harmonic current on the grid side, poor power quality, and being unable to meet the usage requirements.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is: to provide a 108-pulse phase-shifting rectifier transformer for high-power frequency converters, including:

[0005] A transformer tank, in which a receiving space is provided;

[0006] A first transformer body, arranged in the receiving space of the transformer tank. The high-voltage side of the first transformer body is connected in a star connection, the high-voltage side is three-split, the low-voltage side is connected in a multi-winding extended delta connection, the low-voltage side is nine-split, and the phase angles of the low-voltage side of the first transformer body relative to the high-voltage side of the first transformer body are respectively ±6.67°, ±13.33°, ±20°, ±26.67°, 0°, with a mutual difference of 6.67°. A first iron core is arranged inside the first transformer body, and a first high-voltage winding and a first low-voltage winding are sequentially arranged from the inside to the outside along the radial direction of the first iron core; and

[0007] The second body is disposed within the accommodation space of the body box. The high-voltage side of the second body is connected in a delta configuration, and the high-voltage side is three-split. The low-voltage side is connected in a multi-winding extended delta configuration, and the low-voltage side is nine-split. The phase angles of the low-voltage side of the second body relative to the high-voltage side of the second body are respectively ±6.67°, ±13.33°, ±20°, ±26.67°, 0°, with a mutual difference of 6.67°. A second iron core is disposed inside the second body, and a second high-voltage winding and a second low-voltage winding are sequentially arranged from the inside to the outside along the radial direction of the second iron core;

[0008] The first body is connected in parallel with the second body. The phase angles of the low-voltage sides of the first body and the second body after parallel connection relative to the input power supply input to the body box are respectively ±3.33°, ±6.67°, ±10°, ±13.33°, ±16.67°, ±20°, ±23.33°, ±26.67°, 0°, +30°, with a mutual difference of 3.33°.

[0009] In a possible implementation manner, the first low-voltage winding includes a first phase-shifting winding and a first basic winding. The first phase-shifting winding and the first basic winding together include 17 windings. The phase-shifting angles of the first phase-shifting winding are symmetrically arranged from bottom to top. The second low-voltage winding includes a second phase-shifting winding and a second basic winding. The second phase-shifting winding and the second basic winding together include 17 windings. The phase-shifting angles of the second phase-shifting winding are symmetrically arranged from bottom to top.

[0010] In a possible implementation manner, the three phases of the first body together include 60 windings, and the three phases of the second body together include 60 windings.

[0011] In a possible implementation manner, a first grounding screen is disposed between the first high-voltage winding and the first low-voltage winding, and a second grounding screen is disposed between the second high-voltage winding and the second low-voltage winding.

[0012] In a possible implementation manner, the high-voltage side of the first body is axially three-split, and the reactance heights of different windings included in the first high-voltage winding are not equal. The high-voltage side of the second body is axially three-split, and the reactance heights of different windings included in the second high-voltage winding are not equal.

[0013] In a possible implementation manner, the first phase-shifting winding and the first basic winding are coaxially arranged, and the second phase-shifting winding and the second basic winding are coaxially arranged.

[0014] In a possible implementation manner, the wires of the first high-voltage winding, the first low-voltage winding, the second high-voltage winding, and the second low-voltage winding are of a continuous pancake structure.

[0015] In a possible implementation, the first high-voltage winding includes a first high-voltage winding a, a first high-voltage winding b, and a first high-voltage winding c. The first low-voltage winding includes a first low-voltage winding a, a first low-voltage winding b, and a first low-voltage winding c. The first high-voltage winding a is correspondingly connected to the first low-voltage winding a, the first high-voltage winding b is correspondingly connected to the first low-voltage winding b, and the first high-voltage winding c is correspondingly connected to the first low-voltage winding c. The second high-voltage winding includes a second high-voltage winding a, a second high-voltage winding b, and a second high-voltage winding c. The second low-voltage winding includes a second low-voltage winding a, a second low-voltage winding b, and a second low-voltage winding c. The second high-voltage winding a is correspondingly connected to the second low-voltage winding a, the second high-voltage winding b is correspondingly connected to the second low-voltage winding b, and the second high-voltage winding c is correspondingly connected to the second low-voltage winding c.

[0016] In a possible implementation, the first high-voltage winding and the corresponding second high-voltage winding have a 30° angular difference.

[0017] In a possible implementation, bushings are provided on the tank, and the bushings are arranged on the top of the body.

[0018] The beneficial effects of a 108-pulse phase-shifted rectifier transformer for high-power frequency converters provided by the present invention are as follows: Compared with the prior art, it includes a tank, a first body and a second body. The first body and the second body are arranged in parallel in the tank. The high-voltage side of the first body adopts a star connection and is three-split, and the low-voltage side adopts a multi-winding extended delta connection and is nine-split. The high-voltage side of the second body adopts a delta connection and is three-split, and the low-voltage side adopts a multi-winding extended delta connection and is nine-split. The high-voltage sides of the first body and the second body adopt different connection methods, and the low-voltage sides of the first body and the second body adopt the same connection method and phase-shift angle, reducing the data deviation between the first body and the second body, simplifying the production and manufacturing steps, shortening the production duration, simplifying the manufacturing process, being able to cancel harmonics below the 106th pulse, and the lowest-order harmonic output is the 107th. Compared with 54-pulse, 36-pulse, and 24-pulse rectifier transformers, the harmonic current fed back to the power grid is greatly reduced, and the power grid environment is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1Schematic structural diagram of the phase-shifting rectifier transformer provided by the embodiment of the present invention;

[0021] Figure 2 Composite vector diagram of phase-shifting angles of the first core body adopted in the embodiment of the present invention;

[0022] Figure 3 Composite vector diagram of phase-shifting angles of the second core body adopted in the embodiment of the present invention;

[0023] Figure 4 Schematic structural diagram of the cable box of the phase-shifting rectifier transformer provided by the embodiment of the present invention.

[0024] In the figure: 1. Tank; 2. First iron core; 3. Second iron core; 4. First grounding screen; 5. Second grounding screen; 6. First high-voltage winding; 7. First low-voltage winding; 8. Second high-voltage winding; 9. Second low-voltage winding; 10. Connecting copper bar; 11. Insulator; 12. Cable box; 13. Bushing; 14. Gland. Detailed implementation manners

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] Please refer to Figures 1 to 3, a specific implementation manner of a 108-pulse phase-shifted rectifier transformer for a high-power frequency converter provided by the present invention will be described, including: a transformer tank 1, a first core body and a second core body. A receiving space is arranged in the transformer tank 1; the first core body is arranged in the receiving space of the transformer tank 1. The high-voltage side of the first core body adopts a star connection method, the high-voltage side is three-split, the low-voltage side adopts a multi-winding extended delta connection method, and the low-voltage side is nine-split. The phase angles of the low-voltage side of the first core body relative to the high-voltage side of the first core body are ±6.67°, ±13.33°, ±20°, ±26.67°, 0° respectively, with a mutual difference of 6.67°. A first iron core 2 is arranged inside the first core body. Along the radial direction of the first iron core 2, a first high-voltage winding 6 and a first low-voltage winding 7 are arranged in sequence from inside to outside; the second core body is arranged in the receiving space of the transformer tank 1. The high-voltage side of the second core body adopts a delta connection method, the high-voltage side is three-split, the low-voltage side adopts a multi-winding extended delta connection method, and the low-voltage side is nine-split. The phase angles of the low-voltage side of the second core body relative to the high-voltage side of the second core body are ±6.67°, ±13.33°, ±20°, ±26.67°, 0° respectively, with a mutual difference of 6.67°. A second iron core 3 is arranged inside the second core body. Along the radial direction of the second iron core 3, a second high-voltage winding 8 and a second low-voltage winding 9 are arranged in sequence from inside to outside; the first core body and the second core body are connected in parallel. After being connected in parallel, the phase angles of the low-voltage side of the first core body and the low-voltage side of the second core body relative to the input power supply input into the transformer tank 1 are ±3.33°, ±6.67°, ±10°, ±13.33°, ±16.67°, ±20°, ±23.33°, ±26.67°, 0°, +30° respectively, with a mutual difference of 3.33°.

[0027] A 108-pulse phase-shifted rectifier transformer for a high-power frequency converter provided by the present invention, compared with the prior art, includes a transformer tank 1, a first core body and a second core body. The first core body and the second core body are connected in parallel and arranged in the transformer tank 1. The high-voltage side of the first core body adopts a star connection method and is three-split, the low-voltage side adopts a multi-winding extended delta connection method and is nine-split. The high-voltage side of the second core body adopts a delta connection method and is three-split, the low-voltage side adopts a multi-winding extended delta connection method and is nine-split. The high-voltage sides of the first core body and the second core body adopt different connection methods, and the low-voltage sides of the first core body and the second core body adopt the same connection method and phase-shifting angle, reducing the data deviation between the first core body and the second core body, simplifying the production and manufacturing steps, shortening the production duration, simplifying the manufacturing process, canceling harmonics below the 106th pulse, and the lowest-order harmonic output is the 107th order. Compared with 54-pulse, 36-pulse, and 24-pulse rectifier transformers, the harmonic current fed back to the power grid is greatly reduced, and the power grid environment is improved.

[0028] Specifically, please refer to Figures 1 to 3, including a transformer tank 1, a first transformer body and a second transformer body. An accommodation space is provided inside the transformer tank 1. The first transformer body and the second transformer body are arranged in parallel in the accommodation space of the transformer tank 1, effectively reducing the volume of the transformer tank 1 and facilitating transportation and installation. The high-voltage side of the first transformer body adopts a star connection and is three-split, that is, the first high-voltage winding 6 on the high-voltage side is divided into three groups of windings. The low-voltage side of the first transformer body adopts a multi-winding extended delta connection and is nine-split, that is, the first low-voltage winding 7 on the low-voltage side is divided into nine groups of windings. The high-voltage side of the second transformer body adopts a delta connection and is three-split, that is, the second high-voltage winding 8 on the high-voltage side is divided into three groups of windings. The low-voltage side of the second transformer body adopts a multi-winding extended delta connection and is nine-split, that is, the second low-voltage winding 9 on the low-voltage side is divided into nine groups of windings. The high-voltage sides of the first transformer body and the second transformer body adopt different connection methods, and the low-voltage sides of the first transformer body and the second transformer body adopt the same connection method and phase shift angle. The phase angles of the low-voltage side of the first transformer body relative to the high-voltage side and the low-voltage side of the second transformer body relative to the high-voltage side are the same, which are ±6.67°, ±13.33°, ±20°, ±26.67°, 0° respectively, with a mutual difference of 6.67°. The phase angles of the low-voltage side of the first transformer body and the low-voltage side of the second transformer body relative to the input power supply input to the transformer tank are ±3.33°, ±6.67°, ±10°, ±13.33°, ±16.67°, ±20°, ±23.33°, ±26.67°, 0°, +30° respectively, with a mutual difference of 3.33°. This reduces the data deviation between the first transformer body and the second transformer body, simplifies the production and manufacturing steps, shortens the production duration, simplifies the manufacturing process, greatly reduces the harmonic current fed back to the power grid, and improves the power grid environment.

[0029] As a specific embodiment of a 108-pulse phase-shifted rectifier transformer for a high-power frequency converter provided by the present invention, please refer to Figures 1 to 3 , the first low-voltage winding 7 includes a first phase-shifting winding and a first basic winding. The first phase-shifting winding and the first basic winding together include 17 windings. The phase shift angles of the first phase-shifting winding are symmetrically arranged from bottom to top. The second low-voltage winding 9 includes a second phase-shifting winding and a second basic winding. The second phase-shifting winding and the second basic winding together include 17 windings. The phase shift angles of the second phase-shifting winding are symmetrically arranged from bottom to top.

[0030] Specifically, please refer to Figures 1 to 3 , the first low-voltage winding 7 includes a total of 17 windings. The 17 windings form the first phase-shifting winding and the first basic winding. The phase shift angles of the first phase-shifting winding are symmetrically arranged from bottom to top. The second low-voltage winding 9 includes a total of 17 windings. The 17 windings form the second phase-shifting winding and the second basic winding. The phase shift angles of the second phase-shifting winding are symmetrically arranged from bottom to top. The phase shift angles of the first phase-shifting winding and the second phase-shifting winding are axially symmetrically arranged. Windings with the same phase shift angle are in the same position in the magnetic field, reducing the electrical parameter deviation.

[0031] As a specific embodiment of the 108-pulse phase-shifted rectifier transformer for high-power inverters provided by the present invention, please refer to Figures 1 to 3 , the three phases of the first body include a total of 60 windings, and the three phases of the second body include a total of 60 windings.

[0032] Specifically, please refer to Figures 1 to 3 , the three phases of the first body include a total of 60 windings, and the three phases of the second body include a total of 60 windings. The first body includes a three-phase winding arrangement. Each single-phase winding includes a first high-voltage winding on the first high-voltage side that is three-split and includes 3 windings. The first phase-shifted winding and the first basic winding on the low-voltage side of the first body include a total of 17 windings, that is, the single phase of the first body has 20 windings, and the three phases have 60 windings; the second body has the same winding arrangement as the first body. The single phase of the second body has 20 windings, and the three phases have 60 windings.

[0033] As a specific embodiment of the 108-pulse phase-shifted rectifier transformer for high-power inverters provided by the present invention, please refer to Figures 1 to 3 , a first grounding screen 4 is provided between the first high-voltage winding 6 and the first low-voltage winding 7, and a second grounding screen 5 is provided between the second high-voltage winding 8 and the second low-voltage winding 9.

[0034] Specifically, please refer to Figures 1 to 3 , the first high-voltage winding 6 of the first body is connected to the first low-voltage winding 7 through the first grounding screen 4, and the second high-voltage winding 8 of the second body is connected to the second low-voltage winding 9 through the second grounding screen 5.

[0035] As a specific embodiment of the 108-pulse phase-shifted rectifier transformer for high-power inverters provided by the present invention, please refer to Figures 1 to 3 , the high-voltage side of the first body adopts axial three-split, and the reactance heights of different windings included in the first high-voltage winding 6 are not equal. The high-voltage side of the second body adopts axial three-split, and the reactance heights of different windings included in the second high-voltage winding 8 are not equal.

[0036] Specifically, please refer to Figures 1 to 3 , the high-voltage side of the first body is axially three-split. The three windings on the high-voltage side obtained by the three-split have different reactance heights. The high-voltage side of the second body is axially three-split. The three windings on the high-voltage side obtained by the three-split have different reactance heights, reducing the impedance deviation of the first low-voltage winding 7 and the second low-voltage winding 9, reducing the volume of the device, reducing the consumption of raw materials, reducing the manufacturing cost, and the positions of windings with different heights in the magnetic field are different. Through windings with different heights, the short-circuit impedance under the condition of single winding short circuit is basically the same.

[0037] As a specific embodiment of the 108-pulse phase-shifting rectifier transformer for high-power frequency converters provided by the present invention, please refer to Figures 1 to 3 , the first phase-shifting winding and the first basic winding are coaxially arranged, and the second phase-shifting winding and the second basic winding are coaxially arranged.

[0038] Specifically, please refer to Figures 1 to 3 , the first phase-shifting winding included in the first low-voltage winding 7 and the first basic winding are coaxially arranged, and the second phase-shifting winding included in the second low-voltage winding 9 and the second basic winding are coaxially arranged, effectively reducing the volume of the device and lowering the manufacturing cost.

[0039] As a specific embodiment of the 108-pulse phase-shifting rectifier transformer for high-power frequency converters provided by the present invention, please refer to Figures 1 to 3 , the conductors of the first high-voltage winding 6, the first low-voltage winding 7, the second high-voltage winding 8, and the second low-voltage winding 9 are of a continuous pancake structure.

[0040] Specifically, please refer to Figures 1 to 3 , all the windings included in the first body and the second body are of a continuous pancake structure. The setting of the pancake structure improves the short-circuit resistance of the device, is simple to wind, and improves the production efficiency.

[0041] As a specific embodiment of the 108-pulse phase-shifting rectifier transformer for high-power frequency converters provided by the present invention, please refer to Figures 1 to 3 , the first high-voltage winding 6 includes a first high-voltage winding a, a first high-voltage winding b, and a first high-voltage winding c. The first low-voltage winding 7 includes a first low-voltage winding a, a first low-voltage winding b, and a first low-voltage winding c. The first high-voltage winding a is correspondingly connected to the first low-voltage winding a, the first high-voltage winding b is correspondingly connected to the first low-voltage winding b, and the first high-voltage winding c is correspondingly connected to the first low-voltage winding c; the second high-voltage winding 8 includes a second high-voltage winding a, a second high-voltage winding b, and a second high-voltage winding c. The second low-voltage winding 9 includes a second low-voltage winding a, a second low-voltage winding b, and a second low-voltage winding c. The second high-voltage winding a is correspondingly connected to the second low-voltage winding a, the second high-voltage winding b is correspondingly connected to the second low-voltage winding b, and the second high-voltage winding c is correspondingly connected to the second low-voltage winding c.

[0042] Specifically, please refer to Figures 1 to 3, the high-voltage side of the first body is three-split to obtain three sets of windings, namely the first high-voltage winding a, the first high-voltage winding b, and the first high-voltage winding c. The low-voltage side of the first body is nine-split, including 17 windings, which are divided into the first low-voltage winding a, the first low-voltage winding b, and the first low-voltage winding c. The first high-voltage winding a is correspondingly connected to the first low-voltage winding a, the first high-voltage winding b is correspondingly connected to the first low-voltage winding b, and the first high-voltage winding c is correspondingly connected to the first low-voltage winding c; the high-voltage side of the second body is three-split to obtain three sets of windings, namely the second high-voltage winding a, the second high-voltage winding b, and the second high-voltage winding c. The low-voltage side of the second body is nine-split, including 17 windings, which are divided into the second low-voltage winding a, the second low-voltage winding b, and the second low-voltage winding c. The second high-voltage winding a is correspondingly connected to the second low-voltage winding a, the second high-voltage winding b is correspondingly connected to the second low-voltage winding b, and the second high-voltage winding c is correspondingly connected to the second low-voltage winding c.

[0043] As a specific embodiment of the 108-pulse phase-shifting rectifier transformer for high-power inverters provided by the present invention, please refer to Figures 1 to 3 , the first high-voltage winding 6 and the corresponding second high-voltage winding 8 have a 30° angular difference.

[0044] Specifically, please refer to Figures 1 to 3 , the high-voltage side of the first body is connected in star, the high-voltage side of the second body is connected in delta. There is a 30° angular difference between the windings included in the first low-voltage winding 7 and the corresponding windings included in the second low-voltage winding 9. The phase-shifting angles of the low-voltage sides of the first body and the second body are ±26.67°, ±20°, ±13.33°, ±6.67°, 0° respectively. For the first phase-shifting winding and the first basic winding with the same phase-shifting angle degree, by changing the connection method of the first basic winding, the positive and negative of the angle are changed. For the second phase-shifting winding and the second basic winding with the same phase-shifting angle degree, by changing the connection method of the second basic winding, the positive and negative of the angle are changed. The number of turns of the wires of the first phase-shifting winding and the first basic winding with the same phase-shifting angle degree remains unchanged, and the number of turns of the wires of the second phase-shifting winding and the second basic winding with the same phase-shifting angle degree remains unchanged, which simplifies the design and improves the production efficiency.

[0045] Furthermore, please refer to Figures 1 to 3, the first high-voltage winding a, the first high-voltage winding b, and the first high-voltage winding c are sequentially arranged from top to bottom. The first low-voltage winding a, the first low-voltage winding b, and the first low-voltage winding c are sequentially arranged from top to bottom. The first low-voltage winding a includes 6 windings, which are, from top to bottom, the first phase-shifting winding of +6.67°, the first basic winding of +6.67°, the first phase-shifting winding of +13.33°, the first basic winding of +13.33°, the first phase-shifting winding of +26.67°, and the first basic winding of +26.67°. The first low-voltage winding b includes 5 windings, which are, from top to bottom, the first phase-shifting winding of +20°, the first basic winding of +20°, the first basic winding of 0°, the first basic winding of -20°, and the first phase-shifting winding of -20°. The first low-voltage winding c includes 6 windings, which are, from top to bottom, the first basic winding of -26.67°, the first phase-shifting winding of -26.67°, the first basic winding of -13.33°, the first phase-shifting winding of -13.33°, the first basic winding of -6.67°, and the first phase-shifting winding of -6.67°.

[0046] Further, please refer to Figures 1 to 3 , the winding structures and angles of the first low-voltage winding a and the second low-voltage winding a, the first low-voltage winding b and the second low-voltage winding b, and the first low-voltage winding c and the second low-voltage winding c are the same.

[0047] As a specific embodiment of the 108-pulse phase-shifting rectifier transformer for high-power frequency converters provided by the present invention, please refer to Figures 1 to 4 , a bushing 13 is provided on the transformer tank 1, and the bushing 13 is arranged at the top of the transformer body.

[0048] Specifically, please refer to Figures 1 to 4 , a bushing 13 with top lead-out is provided on the transformer tank 1. The bushing 13 includes a high-voltage bushing and a low-voltage bushing. A total of 57 bushings 13 are provided. The high-voltage bushing and the low-voltage bushing are placed in the cable box 12. The cable box 12 is arranged at the top of the transformer tank 1 and covers the bushing 13. The wiring of the bushing 13 is led out by a wiring copper bar 10. The insulator 11 fixes the lead on the wiring copper bar 10. A gland 14 is provided on the cable box 12, and the lead passes through the gland 14 and out of the cable box 12. The gland 14 has a sealing effect, effectively preventing dust, moisture, animals, etc. from entering the box body, avoiding potential safety hazards during the operation of the device, and improving the stability and reliability of the device operation.

[0049] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A 108-pulse phase-shifted rectifier transformer for high-power frequency converters, characterized in that, Including: An apparatus box, within which an accommodation space is provided; A first apparatus body, disposed within the accommodation space of the apparatus box. The high-voltage side of the first apparatus body is connected in a star configuration, with the high-voltage side being three-split, and the low-voltage side is connected in a multi-winding extended delta configuration, with the low-voltage side being nine-split. The phase angles of the low-voltage side of the first apparatus body relative to the high-voltage side of the first apparatus body are respectively ±6.67°, ±13.33°, ±20°, ±26.67°, 0°, with a mutual difference of 6.67°. A first iron core is provided inside the first apparatus body, and a first high-voltage winding and a first low-voltage winding are sequentially arranged from the inside to the outside along the radial direction of the first iron core; And A second apparatus body, disposed within the accommodation space of the apparatus box. The high-voltage side of the second apparatus body is connected in a delta configuration, with the high-voltage side being three-split, and the low-voltage side is connected in a multi-winding extended delta configuration, with the low-voltage side being nine-split. The phase angles of the low-voltage side of the second apparatus body relative to the high-voltage side of the second apparatus body are respectively ±6.67°, ±13.33°, ±20°, ±26.67°, 0°, with a mutual difference of 6.67°. A second iron core is provided inside the second apparatus body, and a second high-voltage winding and a second low-voltage winding are sequentially arranged from the inside to the outside along the radial direction of the second iron core; The first apparatus body and the second apparatus body are connected in parallel. The phase angles of the low-voltage side of the first apparatus body and the low-voltage side of the second apparatus body after parallel connection relative to the input power supply input into the apparatus box are respectively ±3.33°, ±6.67°, ±10°, ±13.33°, ±16.67°, ±20°, ±23.33°, ±26.67°, 0°, +30°, with a mutual difference of 3.33°; The first low-voltage winding includes a total of 17 windings, and the 17 windings form a first phase-shifting winding and a first basic winding. The phase-shifting angles of the first phase-shifting winding are symmetrically arranged from bottom to top. The second low-voltage winding includes a total of 17 windings, and the 17 windings form a second phase-shifting winding and a second basic winding. The phase-shifting angles of the second phase-shifting winding are symmetrically arranged from bottom to top. The phase-shifting angles of the first phase-shifting winding and the second phase-shifting winding are axially symmetrically arranged, and windings with the same phase-shifting angle are in the same position in the magnetic field, reducing the deviation of electrical parameters; The first high-voltage winding includes a first high-voltage winding a, a first high-voltage winding b, and a first high-voltage winding c. The first low-voltage winding includes a first low-voltage winding a, a first low-voltage winding b, and a first low-voltage winding c. The first high-voltage winding a is correspondingly connected to the first low-voltage winding a, the first high-voltage winding b is correspondingly connected to the first low-voltage winding b, and the first high-voltage winding c is correspondingly connected to the first low-voltage winding c. The second high-voltage winding includes a second high-voltage winding a, a second high-voltage winding b, and a second high-voltage winding c. The second low-voltage winding includes a second low-voltage winding a, a second low-voltage winding b, and a second low-voltage winding c. The second high-voltage winding a is correspondingly connected to the second low-voltage winding a, the second high-voltage winding b is correspondingly connected to the second low-voltage winding b, and the second high-voltage winding c is correspondingly connected to the second low-voltage winding c. The first high-voltage winding a, the first high-voltage winding b, and the first high-voltage winding c are arranged sequentially from top to bottom. The first low-voltage winding a, the first low-voltage winding b, and the first low-voltage winding c are arranged sequentially from top to bottom. The first low-voltage winding a includes 6 windings, which are, from top to bottom, a first phase-shifting winding of +6.67°, a first basic winding of +6.67°, a first phase-shifting winding of +13.33°, a first basic winding of +13.33°, a first phase-shifting winding of +26.67°, and a first basic winding of +26.67°. The first low-voltage winding b includes 5 windings, which are, from top to bottom, a first phase-shifting winding of +20°, a first basic winding of +20°, a first basic winding of 0°, a first basic winding of -20°, and a first phase-shifting winding of -20°. The first low-voltage winding c includes 6 windings, which are, from top to bottom, a first basic winding of -26.67°, a first phase-shifting winding of -26.67°, a first basic winding of -13.33°, a first phase-shifting winding of -13.33°, a first basic winding of -6.67°, and a first phase-shifting winding of -6.67°. There is a 30° angular difference between the first high-voltage winding and the corresponding second high-voltage winding. The high-voltage side of the first body adopts axial three-splitting. The reactance heights of different windings included in the first high-voltage winding are not equal. The high-voltage side of the second body adopts axial three-splitting. The reactance heights of different windings included in the second high-voltage winding are not equal, reducing the impedance deviation of the first low-voltage winding and the second low-voltage winding and shrinking the volume of the device. Bushings are provided on the tank body. The bushings are arranged on the top of the body. The bushings include high-voltage bushings and low-voltage bushings. The high-voltage bushings and the low-voltage bushings are placed in a cable box. The cable box is arranged on the top of the tank body and covers the bushings. The wiring of the bushings is led out by a wiring copper bar. Insulators fix the lead wires on the wiring copper bar. A gland is provided on the cable box, and the lead wires pass through the gland and out of the cable box.

2. The 108-pulse phase-shifted rectifier transformer for high-power frequency converters according to claim 1, wherein, The three phases of the first body altogether include 60 windings, and the three phases of the second body altogether include 60 windings.

3. A 108-pulse phase-shifted rectifier transformer for a high-power frequency converter according to claim 1, characterized in that, A first grounding screen is arranged between the first high-voltage winding and the first low-voltage winding, and a second grounding screen is arranged between the second high-voltage winding and the second low-voltage winding.

4. A 108-pulse phase-shifted rectifier transformer for high-power frequency converters according to claim 1, characterized in that, The first phase-shifting winding and the first basic winding are arranged coaxially, and the second phase-shifting winding and the second basic winding are arranged coaxially.

5. The 108-pulse phase-shifted rectifier transformer for high-power frequency converters according to claim 1, wherein The conductors of the first high-voltage winding, the first low-voltage winding, the second high-voltage winding, and the second low-voltage winding are all of a continuous pancake structure.

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