A multi-pulse rectifier transformer with built-in detuning function

Abstract

The present invention provides a multi-pulse rectifier transformer with a self-harmonic elimination function, belonging to the technical field of transformers. The multi-pulse rectifier transformer with a self-harmonic elimination function provided by the present invention comprises an oil tank, a first rectifier transformer body, a second rectifier transformer body and an active filter transformer body. The first rectifier transformer body, the second rectifier transformer body and the active filter transformer body are arranged in the oil tank. The first rectifier transformer body and the second rectifier transformer body are arranged along the length direction of the oil tank. The active filter transformer body is arranged perpendicular to the length direction of the first rectifier transformer body and is arranged at one end of the first rectifier transformer body away from the second rectifier transformer body. The multi-pulse rectifier transformer with a self-harmonic elimination function provided by the present invention comprises an oil tank, a first rectifier transformer body, a second rectifier transformer body and an active filter transformer body arranged in the same oil tank, which reduces the volume of the transformer, reduces the cost and reduces the difficulty of installation.

Description

Technical Field

[0001] The invention belongs to the technical field of transformers, and in particular relates to a multi-pulse rectifier transformer with a self-harmonic elimination function. Background Art

[0002] Rectifier transformers and rectifier elements are used to convert the three-phase AC power of the power grid into DC power with a certain number of phases required by users. They are mainly used to supply power to non-linear loads such as electric iron, electrolysis, chemical industry, and calcium carbide furnaces. During the power supply process, the unidirectional blocking effect of the rectifier element causes the waveform of the alternating magnetic field of the rectifier transformer to be distorted, resulting in the current taken from the AC power grid by the rectifier device being non-sinusoidal even if the grid voltage provides an ideal sine wave. Non-sinusoidal AC power is input into the rectifier device and fed back to the AC power grid through the rectifier device, causing the voltage waveform at each point in the AC system to be distorted. The distorted grid voltage in turn affects the waveform of the current taken from the AC power grid by the rectifier device. The emergence of harmonic current and harmonic voltage pollutes the public power grid and deteriorates the environment in which electrical equipment is used. Harmonics cause additional harmonic losses in the components of the public power grid. Harmonics affect the normal operation of various electrical equipment, causing the equipment to overheat, reducing the efficiency and utilization of the equipment, and may cause the capacitor to fail to operate normally due to overheating, overvoltage, etc. A large amount of third harmonics flowing through the neutral line will cause the line to overheat or even cause a fire. Research and practice have proved that the magnitude of the voltage waveform distortion of the AC power grid is directly related to the frequency of the harmonic current fed into the power grid by the rectifier, that is, the harmonic number. In order to effectively reduce the pollution of the harmonics of the rectifier to the power grid, active filters are often used to limit the frequency of the harmonic current injected into the power grid by the rectifier. Active filters need to be used in conjunction with active filter transformers during use. The use of active filter transformers and rectifier transformers makes the device occupy a large area, difficult to install, and high in manufacturing cost. Summary of the invention

[0003] The purpose of the present invention is to provide a multi-pulse rectifier transformer with a self-harmonic elimination function, aiming to solve the problem that the use of an active filter transformer and a rectifier transformer causes the device to occupy a large area, is difficult to install, and has a high manufacturing cost.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a multi-pulse rectifier transformer with a self-harmonic elimination function, comprising an oil tank, a first rectifier transformer body, a second rectifier transformer body and an active filter transformer body, wherein an installation space is provided in the oil tank, the first rectifier transformer body, the second rectifier transformer body and the active filter transformer body are arranged in the installation space, the first rectifier transformer body and the second rectifier transformer body are arranged along the length direction of the oil tank, the active filter transformer body is arranged perpendicular to the length direction of the first rectifier transformer body, and is arranged at one end of the first rectifier transformer body away from the second rectifier transformer body.

[0005] In one possible implementation, the high-voltage side of the first rectifier transformer body adopts a star connection, and the high-voltage side of the second rectifier transformer body adopts a delta connection; or, the high-voltage side of the first rectifier transformer body adopts a delta connection, and the high-voltage side of the second rectifier transformer body adopts a star connection.

[0006] In a possible implementation manner, the low-voltage side structures of the first rectifier transformer body and the second rectifier transformer body are consistent.

[0007] In a possible implementation, the first rectifier transformer body includes a first rectifier core, a first rectifier low-voltage winding, a first rectifier grounding screen and a first rectifier high-voltage winding arranged in sequence from the inside to the outside, the first rectifier low-voltage winding includes a first rectifier upper low-voltage winding, a first rectifier medium-low-voltage winding and a first rectifier lower low-voltage winding arranged from top to bottom, and the first rectifier high-voltage winding includes a first rectifier upper high-voltage winding, a first rectifier medium-high-voltage winding and a first rectifier lower high-voltage winding arranged from top to bottom.

[0008] In a possible implementation, the first rectifier low-voltage winding is axially split into three.

[0009] In a possible implementation, the first rectifier upper low-voltage winding includes a first rectifier upper phase-shift winding and a first rectifier upper basic winding, and the rectifier third low-voltage winding includes a first rectifier lower basic winding and a first rectifier lower phase-shift winding.

[0010] In a possible implementation, the low-voltage side of the first rectifier transformer body adopts a low-voltage angle-connected phase-shift structure, and the phase-shift angle of the first rectifier upper low-voltage winding is axially symmetrical with the phase-shift angle of the first rectifier lower low-voltage winding.

[0011] In a possible implementation, the phase shift angle of the first rectifier upper low-voltage winding is -20°, the phase shift angle of the first rectifier middle low-voltage winding is 0°, and the phase shift angle of the first rectifier lower low-voltage winding is +20°.

[0012] In a possible implementation, the voltage on the high-voltage side of the first rectifier transformer body is 110 kV, and the lead of the first rectifier low-voltage winding is axially led out from between the first rectifier low-voltage winding and the first rectifier high-voltage winding.

[0013] In a possible implementation, the voltage on the high voltage side of the active filter transformer body is 110 kV, using a star connection, and the voltage on the low voltage side of the active filter transformer body is 350 V, using a delta connection.

[0014] The beneficial effects of a multi-pulse rectifier transformer with a self-harmonic elimination function provided by the present invention are:

[0015] Compared with the prior art, an oil tank, a first rectifier transformer body, a second rectifier transformer body and an active filter transformer body are provided. The first rectifier transformer body, the second rectifier transformer body and the active filter transformer body are arranged in the installation space of the oil tank. The first rectifier transformer body and the second rectifier transformer body are arranged along the length direction of the oil tank, the active filter transformer body is arranged along the width direction of the oil tank, the active filter transformer body is arranged on one side of the first rectifier transformer body, the active filter transformer body has a small capacity, and is placed perpendicular to the first rectifier transformer body and the second rectifier transformer body, thereby reducing the overall volume of the device, saving installation space, and reducing costs and installation difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of a top view of a multi-pulse rectifier transformer for eliminating harmonics provided in an embodiment of the present invention;

[0018] Figure 2 This is a schematic structural diagram of the first rectifier transformer body used in an embodiment of the present invention.

[0019] In the figure: 1, oil tank; 2, first rectifier transformer body; 3, second rectifier transformer body; 4, active filter transformer body; 5, first rectifier core; 6, first rectifier upper phase-shift winding; 7, first rectifier upper basic winding; 8, first rectifier medium and low voltage winding; 9, first rectifier lower basic winding; 10, first rectifier lower phase-shift winding; 11, first inner grounding paper tube; 12, first shielding copper tape; 13, first shielding lead; 14, first outer grounding paper tube; 15, stay; 16, insulating paper tube; 17, first upper end a angle ring; 18, first upper end circle; 19, first upper end b angle ring; 20, first rectifier upper high voltage winding; 21, first rectifier medium and high voltage winding; 22, first rectifier lower high voltage winding; 23, first lower end b angle ring; 24, first lower end circle; 25, first lower end a angle ring. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with 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 intended to limit the present invention.

[0021] Please refer to Figure 1 A specific implementation of a multi-pulse rectifier transformer with a self-harmonic elimination function provided by the present invention is now described, comprising an oil tank 1, a first rectifier transformer body 2, a second rectifier transformer body 3 and an active filter transformer body 4. An installation space is provided in the oil tank 1, and the first rectifier transformer body 2, the second rectifier transformer body 3 and the active filter transformer body 4 are arranged in the installation space. The first rectifier transformer body 2 and the second rectifier transformer body 3 are arranged along the length direction of the oil tank 1, and the active filter transformer body 4 is arranged perpendicular to the length direction of the first rectifier transformer body 2, and is arranged at one end of the first rectifier transformer body 2 away from the second rectifier transformer body 3.

[0022] A multi-pulse rectifier transformer with a self-harmonic elimination function provided by the present invention is provided with an oil tank 1, a first rectifier transformer body 2, a second rectifier transformer body 3 and an active filter transformer body 4 compared with the prior art. The first rectifier transformer body 2, the second rectifier transformer body 3 and the active filter transformer body 4 are arranged in the installation space of the oil tank 1. The first rectifier transformer body 2 and the second rectifier transformer body 3 are arranged along the length direction of the oil tank 1, and the active filter transformer body 4 is arranged along the width direction of the oil tank 1. The active filter transformer body 4 is arranged on one side of the first rectifier transformer body 2. The active filter transformer body 4 has a small capacity and is placed perpendicular to the first rectifier transformer body 2 and the second rectifier transformer body 3, thereby reducing the overall volume of the device, saving installation space, and reducing costs and installation difficulty.

[0023] For details, please refer to Figure 1 , including an oil tank 1, a first rectifier transformer body 2, a second rectifier transformer body 3 and an active filter transformer body 4. An installation space for installing the first rectifier transformer body 2, the second rectifier transformer body 3 and the active filter transformer body 4 is provided in the oil tank 1. The first rectifier transformer body 2 and the second rectifier transformer body 3 are arranged in a row and arranged along the length direction of the oil tank 1. The active filter transformer body 4 is arranged along the width direction of the oil tank 1. The active filter transformer body 4 is arranged perpendicular to the first rectifier transformer body 2 and is arranged on a side of the first rectifier transformer body 2 away from the second rectifier transformer body 3. The first rectifier transformer body 2 and the second rectifier transformer body 3 are operated in parallel to realize 36-pulse output. The active filter transformer body 4 is connected to an active filter arranged outside the oil tank 1 to eliminate harmonics, reduce the overall volume of the device, save installation space, and reduce costs and installation difficulty.

[0024] As a specific implementation of a multi-pulse rectifier transformer with a self-harmonic elimination function provided by the present invention, please refer to Figure 1 , the high-voltage side of the first rectifier transformer body 2 adopts a star connection, and the high-voltage side of the second rectifier transformer body 3 adopts a triangle connection; or, the high-voltage side of the first rectifier transformer body 2 adopts a triangle connection, and the high-voltage side of the second rectifier transformer body 3 adopts a star connection.

[0025] For details, please refer to Figure 1 The first rectifier transformer body 2 and the second rectifier transformer body 3, one of which has a high voltage side connected in a delta connection, and the other has a high voltage side connected in a star connection.

[0026] As a specific implementation of a multi-pulse rectifier transformer with a self-harmonic elimination function provided by the present invention, please refer to Figure 2 The low-voltage side structures of the first rectifier transformer body 2 and the second rectifier transformer body 3 are consistent.

[0027] For details, please refer to Figure 2 The low-voltage side structures of the first rectifier transformer body 2 and the second rectifier transformer body 3 are consistent, and the low-voltage arrangement, phase shift angle and connection method of the first rectifier transformer body 2 and the second rectifier transformer body 3 are exactly the same, which simplifies the manufacturing process, reduces the manufacturing difficulty of the device, and reduces the electrical parameter deviation between the first rectifier transformer body 2 and the second rectifier transformer body 3.

[0028] As a specific implementation of a multi-pulse rectifier transformer with a self-harmonic elimination function provided by the present invention, please refer to Figure 2The first rectifier transformer body 2 includes a first rectifier core 5, a first rectifier low-voltage winding, a first rectifier grounding screen and a first rectifier high-voltage winding arranged in sequence from the inside to the outside. The first rectifier low-voltage winding includes a first rectifier upper low-voltage winding, a first rectifier medium-low-voltage winding 8 and a first rectifier lower low-voltage winding arranged from top to bottom. The first rectifier high-voltage winding includes a first rectifier upper high-voltage winding 20, a first rectifier medium-high-voltage winding 21 and a first rectifier lower high-voltage winding 22 arranged from top to bottom.

[0029] For details, please refer to Figure 2 The first rectifier transformer body 2 includes a first rectifier core 5, a first rectifier low-voltage winding, a first rectifier grounding screen and a first rectifier high-voltage winding arranged in sequence from the inside to the outside. The first rectifier low-voltage winding, the first rectifier grounding screen and the first rectifier high-voltage winding are sleeved on the outside of the first rectifier core 5. The first rectifier low-voltage winding includes a first rectifier upper low-voltage winding, a first rectifier medium-low-voltage winding 8 and a first rectifier lower low-voltage winding arranged in sequence from top to bottom. The first rectifier high-voltage winding includes a first rectifier upper high-voltage winding 20, a first rectifier medium-high-voltage winding 21 and a first rectifier lower high-voltage winding 22 arranged in sequence from top to bottom.

[0030] The second rectifier transformer body 3 includes a second rectifier core, a second rectifier low-voltage winding, a second rectifier grounding screen and a second rectifier high-voltage winding arranged in sequence from the inside to the outside. The second rectifier low-voltage winding, the second rectifier grounding screen and the second rectifier high-voltage winding are sleeved on the outside of the second rectifier core. The second rectifier low-voltage winding has the same structure as the first rectifier low-voltage winding. The second rectifier low-voltage winding includes a second rectifier upper low-voltage winding, a second rectifier medium-low-voltage winding and a second rectifier lower low-voltage winding arranged in sequence from top to bottom. The second rectifier high-voltage winding includes a second rectifier upper high-voltage winding, a second rectifier medium-high-voltage winding and a second rectifier lower high-voltage winding arranged in sequence from top to bottom.

[0031] For further information, please refer to Figure 2A first insulating tube group is arranged on the outside of the first rectifier grounding screen, and the first rectifier grounding screen includes a first inner grounding paper tube 11, a first shielding copper tape 12 and a first outer grounding paper tube 14 which are arranged in sequence from the inside to the outside. The first shielding copper tape 12 is wound around the outside of the first inner grounding paper tube 11, and the first outer grounding paper tube 14 is sleeved on the outside of the first shielding copper tape 12. The end of the upper end of the first shielding copper tape 12 is welded with a first shielding lead 13, which is led out from the upper end of the first rectifier transformer body 2. The first insulating tube group includes multiple groups of struts 15 and multiple groups of insulating paper tubes 16, and three groups of struts 15 and three groups of insulating paper tubes 16 are arranged at intervals. A group of struts 15 is arranged on the outside of the first outer grounding paper tube 14, and an insulating paper tube 16 is sleeved on the outside of the struts 15; a first high-voltage upper end angle ring group is arranged at the upper end of the first rectifier high-voltage winding, and a first high-voltage lower end angle ring group is arranged at the lower end of the first rectifier high-voltage winding. The high-voltage upper end angle ring group includes a first upper end angle ring 17, a first upper end ring 18 and a first upper end angle ring 19 which are arranged in sequence from top to bottom. The first upper end angle ring 19 is covered at the upper end of the first rectifier high-voltage winding. The first upper end angle ring 17 is covered above the first upper end angle ring 19. The vertical ring of the first upper end angle ring 17 is located on the inner side of the horizontal ring. The vertical ring of the first upper end angle ring 17 is located above the support bar 15 in the middle position. The vertical ring of the b angle ring 19 is located on the inner side of the horizontal ring, and the vertical ring of the first upper end b angle ring 19 is located above the support bar 15 closest to the first rectifier high-voltage winding. The first high-voltage lower end angle ring group includes a first lower end a angle ring 25, a first lower end ring 24 and a first lower end b angle ring 23 arranged in sequence from bottom to top. The first lower end a angle ring 25 is symmetrically arranged with the first upper end a angle ring 17, and the first lower end b angle ring 23 is symmetrically arranged with the first upper end b angle ring 19.

[0032] For further information, please refer to Figure 2A second insulating tube group is arranged on the outside of the second rectifier grounding screen, and the second rectifier grounding screen includes a second inner grounding paper tube, a second shielding copper tape and a second outer grounding paper tube arranged in sequence from the inside to the outside, the second shielding copper tape is wound around the outside of the second inner grounding paper tube, the second outer grounding paper tube is sleeved on the outside of the second shielding copper tape, the second shielding lead is welded to the end of the upper end of the second shielding copper tape, and is led out from the upper end of the second rectifier transformer body 3, the second insulating tube group includes multiple groups of struts 15 and multiple groups of insulating paper tubes 16, three groups of struts 15 and three groups of insulating paper tubes 16 are arranged at intervals, a group of struts 15 are arranged on the outside of the second outer grounding paper tube, and the outer side of the struts 15 is sleeved with insulating paper tubes 16; the upper end of the second rectifier high-voltage winding is provided with a second high-voltage upper end angle ring group, and the lower end of the second rectifier high-voltage winding is provided with a second high-voltage lower end angle ring group. End angle ring group, the second high-voltage upper end angle ring group includes the second upper end a angle ring, the second upper end circle and the second upper end b angle ring arranged in sequence from top to bottom, the second upper end b angle ring cover is arranged at the upper end of the second rectifier high-voltage winding, the second upper end a angle ring cover is arranged above the second upper end b angle ring, the vertical ring of the second upper end a angle ring is located on the inner side of the horizontal ring, the vertical ring of the second upper end a angle ring is located above the support bar 15 in the middle position, the vertical ring of the second upper end b angle ring is located on the inner side of the horizontal ring, the vertical ring of the second upper end b angle ring is located above the support bar 15 closest to the second rectifier high-voltage winding, the second high-voltage lower end angle ring group includes the second lower end a angle ring, the second lower end circle and the second lower end b angle ring arranged in sequence from bottom to top, the second lower end a angle ring is symmetrically arranged with the second upper end a angle ring, and the second lower end b angle ring is symmetrically arranged with the second upper end b angle ring.

[0033] As a specific implementation of a multi-pulse rectifier transformer with a self-harmonic elimination function provided by the present invention, please refer to Figure 2 , the first rectifier low-voltage winding is axially split into three.

[0034] For details, please refer to Figure 2 The first rectifier low-voltage winding adopts axial three-split, and the first rectifier low-voltage winding includes 5 windings; the second rectifier low-voltage winding has the same structure as the first rectifier low-voltage winding, and the second rectifier low-voltage winding adopts axial three-split, and the first rectifier low-voltage winding includes 5 windings.

[0035] As a specific implementation of a multi-pulse rectifier transformer with a self-harmonic elimination function provided by the present invention, please refer to Figure 2 The first rectifier upper low-voltage winding includes a first rectifier upper phase-shift winding 6 and a first rectifier upper basic winding 7, and the rectifier third low-voltage winding includes a first rectifier lower basic winding 9 and a first rectifier lower phase-shift winding 10.

[0036] For details, please refer to Figure 2The first rectifier low-voltage winding includes a first rectifier upper phase-shift winding 6, a first rectifier upper basic winding 7, a first rectifier medium-low voltage winding 8, a first rectifier lower basic winding 9 and a first rectifier lower phase-shift winding 10, which are arranged in sequence from top to bottom, a total of 5 windings, the first rectifier upper phase-shift winding 6, the first rectifier upper basic winding 7, the first rectifier lower basic winding 9 and the first rectifier lower phase-shift winding 10 adopt an axial arrangement structure, which effectively reduces the volume of the transformer and reduces the manufacturing cost; the second rectifier low The voltage winding is consistent with the structure of the first rectifier low-voltage winding. The second rectifier low-voltage winding includes a second rectifier upper phase-shift winding, a second rectifier upper basic winding, a second rectifier medium-low voltage winding, a second rectifier lower basic winding and a second rectifier lower phase-shift winding arranged in sequence from top to bottom, a total of 5 windings. The second rectifier upper phase-shift winding, the second rectifier upper basic winding, the second rectifier lower basic winding and the second rectifier lower phase-shift winding adopt an axial arrangement structure, which effectively reduces the volume of the transformer and reduces the manufacturing cost.

[0037] As a specific implementation of a multi-pulse rectifier transformer with a self-harmonic elimination function provided by the present invention, please refer to Figure 2 The low-voltage side of the first rectifier transformer body 2 adopts a low-voltage angle-connected phase-shifting structure, and the phase-shifting angle of the first rectifier upper low-voltage winding and the phase-shifting angle of the first rectifier lower low-voltage winding are arranged axially symmetrically.

[0038] For details, please refer to Figure 2 The first rectifier low-voltage winding adopts a low-voltage angle-connected phase-shifting structure. The phase-shift angle of the first rectifier upper low-voltage winding is equal to the phase-shift angle of the first rectifier lower low-voltage winding, and the directions are opposite. The phase-shift angles of the first rectifier upper low-voltage winding and the first rectifier lower low-voltage winding are axially symmetrically arranged, which can make the windings with the same phase-shift angle in the magnetic field The same position, so that the electrical parameter deviation is smaller; the second rectifier low-voltage winding adopts a low-voltage angle-connected phase-shifting structure. The phase-shift angle of the second rectifier upper low-voltage winding is equal to the phase-shift angle of the second rectifier lower low-voltage winding, and the directions are opposite. The phase-shift angles of the second rectifier upper low-voltage winding and the second rectifier lower low-voltage winding are axially symmetrically arranged, which can make the windings with the same phase-shift angle in the magnetic field The same position, so that the electrical parameter deviation is smaller.

[0039] As a specific implementation of a multi-pulse rectifier transformer with a self-harmonic elimination function provided by the present invention, please refer to Figure 2 The phase shift angle of the first rectifier upper low-voltage winding is -20°, the phase shift angle of the first rectifier middle low-voltage winding 8 is 0°, and the phase shift angle of the first rectifier lower low-voltage winding is +20°.

[0040] For details, please refer to Figure 2The phase shift angle of the upper low-voltage winding of the first rectifier is -20°, the phase shift angle of the middle and low-voltage winding 8 of the first rectifier is 0°, and the phase shift angle of the lower low-voltage winding of the first rectifier is +20°; the phase shift angle of the upper low-voltage winding of the second rectifier is -20°, the phase shift angle of the middle and low-voltage winding of the second rectifier is 0°, and the phase shift angle of the lower low-voltage winding of the second rectifier is +20°.

[0041] As a specific implementation of a multi-pulse rectifier transformer with a self-harmonic elimination function provided by the present invention, please refer to Figure 2 The voltage on the high-voltage side of the first rectifier transformer body 2 is 110 kV, and the lead of the first rectifier low-voltage winding is axially led out from between the first rectifier low-voltage winding and the first rectifier high-voltage winding.

[0042] For details, please refer to Figure 2 The voltage on the high-voltage side of the first rectifier transformer body 2 is 110kV. The lead of the first rectifier low-voltage winding is led out from between the first rectifier low-voltage winding and the first rectifier high-voltage winding, and is led out axially. The lead of the first rectifier upper low-voltage winding is led out axially upward from the top of the first rectifier high-voltage winding. The lead of the first rectifier medium and low-voltage winding 8 and the first rectifier lower low-voltage winding is led out axially downward from the bottom of the first rectifier high-voltage winding.

[0043] As a specific implementation of a multi-pulse rectifier transformer with a self-harmonic elimination function provided by the present invention, please refer to Figure 1 The voltage on the high voltage side of the active filter transformer body 4 is 110 kV, using a star connection, and the voltage on the low voltage side of the active filter transformer body 4 is 350 V, using a triangle connection.

[0044] For details, please refer to Figure 1 The voltage on the high voltage side of the active filter transformer body 4 is 110 kV, using a star connection, and the voltage on the low voltage side of the active filter transformer body 4 is 350 V, using a triangle connection.

[0045] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-pulse rectifier transformer with built-in detuning function, characterized in that: The invention comprises an oil tank, a first rectifier transformer body, a second rectifier transformer body and an active filter transformer body. An installation space is arranged in the oil tank. The first rectifier transformer body, the second rectifier transformer body and the active filter transformer body are arranged in the installation space. The first rectifier transformer body and the second rectifier transformer body are arranged along the length direction of the oil tank. The active filter transformer body is arranged perpendicular to the length direction of the first rectifier transformer body and is arranged at one end of the first rectifier transformer body away from the second rectifier transformer body. The first rectifier transformer body comprises a first rectifier core, a first rectifier low-voltage winding, a first rectifier grounding screen and a first rectifier transformer body which are arranged in sequence from the inside to the outside. The first rectifier low-voltage winding comprises a first rectifier upper low-voltage winding, a first rectifier medium-low-voltage winding and a first rectifier lower low-voltage winding arranged from top to bottom, the lead of the first rectifier low-voltage winding is led out from between the first rectifier low-voltage winding and the first rectifier high-voltage winding, and is led out along the axial direction, the lead of the first rectifier upper low-voltage winding is led out upward along the axial direction, and is led out from the top of the first rectifier high-voltage winding, the lead of the first rectifier medium-low-voltage winding and the first rectifier lower low-voltage winding is led out downward along the axial direction, and is led out from the bottom of the first rectifier high-voltage winding, the first rectifier grounding screen is provided with a first insulating cylinder group on the outside, and the first rectifier grounding screen comprises a first inner insulator arranged in sequence from the inside to the outside A ground paper tube, a first shielding copper tape and a first external grounding paper tube, the first shielding copper tape is wound around the outside of the first internal grounding paper tube, the first external grounding paper tube is sleeved on the outside of the first shielding copper tape, the first shielding lead is welded to the end of the upper end of the first shielding copper tape, and is led out from the upper end of the first rectifier transformer body, the first insulating tube group includes multiple groups of stays and multiple groups of insulating paper tubes, three groups of stays and three groups of insulating paper tubes are arranged at intervals, a group of stays is arranged on the outside of the first external grounding paper tube, and the insulating paper tube is sleeved on the outside of the stays, the upper end of the first rectifier high-voltage winding is provided with a first high-voltage upper end angle ring group, and the lower end of the first rectifier high-voltage winding is provided with a first high-voltage lower end angle ring group, The first high-voltage upper end angle ring group includes a first upper end angle ring a, a first upper end circle and a first upper end angle ring b arranged in sequence from top to bottom, the first upper end angle ring b cover is arranged at the upper end of the first rectifier high-voltage winding, the first upper end angle ring a cover is arranged above the first upper end angle ring b, the vertical ring of the first upper end angle ring a is located on the inner side of the horizontal ring, the vertical ring of the first upper end angle ring a is located above the support bar in the middle position, the vertical ring of the first upper end angle ring b is located on the inner side of the horizontal ring, and the vertical ring of the first upper end angle ring b is located above the support bar closest to the first rectifier high-voltage winding, the first high-voltage lower end angle ring group includes a first lower end angle ring a, a first lower end circle and a first lower end angle ring b arranged in sequence from bottom to top,The first lower end a angle ring is symmetrically arranged with the first upper end a angle ring, and the first lower end b angle ring is symmetrically arranged with the first upper end b angle ring.

2. A multi-pulse rectifier transformer with self-harmonic elimination function as claimed in claim 1, characterized in that: The high-voltage side of the first rectifier transformer body adopts a star connection, and the high-voltage side of the second rectifier transformer body adopts a delta connection; or, the high-voltage side of the first rectifier transformer body adopts a delta connection, and the high-voltage side of the second rectifier transformer body adopts a star connection.

3. A multi-pulse rectifier transformer with self-harmonic elimination function as claimed in claim 2, characterized in that: The low-voltage side structures of the first rectifier transformer body and the second rectifier transformer body are consistent.

4. A multi-pulse rectifier transformer with self-harmonic elimination function as claimed in claim 3, characterized in that: The first rectifying high-voltage winding includes a first rectifying upper high-voltage winding, a first rectifying middle high-voltage winding and a first rectifying lower high-voltage winding arranged from top to bottom.

5. A multi-pulse rectifier transformer with a self-harmonic elimination function as claimed in claim 4, characterized in that: The first rectifier low-voltage winding is axially split into three.

6. A multi-pulse rectifier transformer with a self-harmonic elimination function as claimed in claim 5, characterized in that: The first rectifier upper low-voltage winding includes a first rectifier upper phase-shift winding and a first rectifier upper basic winding, and the rectifier third low-voltage winding includes a first rectifier lower basic winding and a first rectifier lower phase-shift winding.

7. A multi-pulse rectifier transformer with a self-harmonic elimination function as claimed in claim 6, characterized in that: The low-voltage side of the first rectifier transformer body adopts a low-voltage angle-connected phase-shifting structure, and the phase-shifting angle of the first rectifier upper low-voltage winding is axially symmetrical with the phase-shifting angle of the first rectifier lower low-voltage winding.

8. A multi-pulse rectifier transformer with a self-harmonic elimination function as claimed in claim 7, characterized in that: The phase shift angle of the first rectifier upper low-voltage winding is -20°, the phase shift angle of the first rectifier middle low-voltage winding is 0°, and the phase shift angle of the first rectifier lower low-voltage winding is +20°.

9. A multi-pulse rectifier transformer with a self-harmonic elimination function as claimed in claim 8, characterized in that: The voltage on the high voltage side of the first rectifier transformer body is 110 kV.

10. A multi-pulse rectifier transformer with a self-harmonic elimination function as claimed in claim 1, characterized in that: The voltage on the high voltage side of the active filter transformer body is 110 kV, using a star connection method, and the voltage on the low voltage side of the active filter transformer body is 350 V, using a triangle connection method.

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