A 110kV direct-step-down multi-pulse phase-shifting rectifier transformer

Abstract

The present invention provides a 110kV direct-step-down multi-pulse phase-shifting rectifier transformer, which belongs to the technical field of transformers. The present invention provides a 110kV direct-step-down multi-pulse phase-shifting rectifier transformer, which includes a box, a coil assembly, a solid insulation assembly and a liquid insulation. Three groups of core columns are arranged in the box; the coil assembly includes a low-voltage coil group and a high-voltage coil group, the low-voltage coil group is wound on the outside of the core column, and the high-voltage coil group is wound on the outside of the low-voltage coil group; the solid insulation assembly includes a low-voltage side insulation group, an insulation paper tube assembly and a high-voltage side insulation group, the low-voltage side insulation group includes a low-voltage upper insulation group and a low-voltage lower insulation group, the insulation paper tube assembly is sleeved on the outside of the low-voltage coil group, and the high-voltage side insulation group includes a high-voltage upper insulation group and a high-voltage lower insulation group. The present invention provides a 110kV direct-step-down multi-pulse phase-shifting rectifier transformer, which has an effect and can be realized. The solid insulation assembly is immersed in liquid insulation to improve the insulation effect and meet the high voltage input.

Description

Technical Field

[0001] The invention belongs to the technical field of transformers, and in particular relates to a 110kV direct-step-down multi-pulse phase-shifting rectifier transformer. Background Art

[0002] Direct-drop multi-pulse rectifier transformers are widely used in engineering construction. Direct-drop multi-pulse rectifier transformers are often used in conjunction with frequency converters during use, and carry loads such as fans and pumps. The primary voltage of the direct-drop multi-pulse rectifier transformers currently used is generally less than 35kV. During use on the construction site, a step-down transformer is generally required as its power source to reduce the input high-level voltage to the primary voltage of the direct-drop multi-pulse rectifier transformer to a specified range. The setting of the step-down transformer leads to an increase in the cost of engineering construction. Increasing the primary voltage of the direct-drop multi-pulse rectifier transformer to 110kV can eliminate the use of the step-down transformer, reduce the cost of engineering construction, and meet the requirements of energy-saving and consumption-reducing construction. At present, the research and development of 110kV direct-drop multi-pulse rectifier transformers has put forward higher requirements for the insulation system of the direct-drop multi-pulse rectifier transformer. The existing insulation system cannot meet the requirements of high voltage input. Summary of the invention

[0003] The object of the present invention is to provide a 110kV direct-step-down multi-pulse phase-shifting rectifier transformer, aiming to solve the problem that the existing insulation system is not suitable for the 110kV direct-step-down multi-pulse phase-shifting rectifier transformer.

[0004] To achieve the above object, the technical solution adopted by the present invention is: to provide a 110kV direct-step-down multi-pulse phase-shifting rectifier transformer, comprising:

[0005] A box body, wherein three groups of iron core columns are arranged in the box body;

[0006] A coil assembly, the coil assembly comprising a low-voltage coil group and a high-voltage coil group, the low-voltage coil group is wound on the outside of the core column, and the high-voltage coil group is wound on the outside of the low-voltage coil group;

[0007] A solid insulation assembly, wherein the solid insulation assembly comprises a low-voltage side insulation group, an insulation paper tube assembly and a high-voltage side insulation group, wherein the low-voltage side insulation group comprises a low-voltage upper insulation group and a low-voltage lower insulation group, wherein the low-voltage upper insulation group is arranged above the low-voltage coil group, wherein the low-voltage lower insulation group is arranged below the low-voltage coil group, wherein the insulation paper tube assembly is sleeved on the outside of the low-voltage coil group, wherein the high-voltage side insulation group comprises a high-voltage upper insulation group and a high-voltage lower insulation group, wherein the high-voltage upper insulation group is arranged above the high-voltage coil group, wherein the high-voltage lower insulation group is arranged below the high-voltage coil group; and

[0008] Liquid insulation is filled between the coil assembly and the solid insulation assembly.

[0009] In a possible implementation, the low-voltage upper insulation group includes a plurality of groups of low-voltage upper end rings arranged sequentially from top to bottom, and the low-voltage lower insulation group includes a plurality of groups of low-voltage lower end rings arranged sequentially from top to bottom.

[0010] In a possible implementation, the insulating paper tube assembly includes a shielding paper tube group and a supporting paper tube group. The shielding paper tube group is sleeved on the outside of the low-voltage coil group, and the supporting paper tube group is sleeved on the outside of the shielding paper tube group.

[0011] In a possible implementation, the shielding paper tube set includes a first paper tube and a second paper tube, and a shielding body is disposed between the first paper tube and the second paper tube.

[0012] In a possible implementation, the supporting paper tube group includes multiple groups of isolation paper tubes and multiple groups of isolation struts, the isolation paper tubes and the isolation struts are arranged at intervals, one group of the isolation struts is arranged on a side of the second paper tube away from the first paper tube, and the isolation paper tube is arranged on a side of the isolation struts away from the first paper tube.

[0013] In a possible implementation, the high-voltage upper insulation group includes multiple groups of high-voltage upper end rings and multiple groups of high-voltage upper angle rings arranged from top to bottom, and the high-voltage upper end rings are arranged between adjacent high-voltage upper angle rings. The high-voltage lower insulation group includes multiple groups of high-voltage lower end rings and multiple groups of high-voltage lower angle rings arranged from top to bottom, and the high-voltage lower end rings are arranged between adjacent high-voltage lower angle rings.

[0014] In a possible implementation, the high-pressure upper angle ring includes a high-pressure upper horizontal ring and a high-pressure upper vertical ring. The high-pressure upper vertical ring is arranged on the lower end surface of the high-pressure upper horizontal ring and along the inner circumference of the high-pressure upper horizontal ring. The high-pressure lower angle ring is symmetrically arranged with the high-pressure upper angle ring.

[0015] In a possible implementation, the lower end of the high-pressure upper vertical ring is located in the gap between two adjacent groups of the isolation paper tubes.

[0016] In a possible implementation, a bottom end ring is provided at the lower ends of the low-voltage coil group and the high-voltage coil group, and a pad is provided at the lower end of the bottom end ring.

[0017] In a possible implementation, a top pressing plate is provided at the upper ends of the low-voltage upper insulation group and the high-voltage upper insulation group, and a top pressing block is provided at the upper end of the top pressing plate.

[0018] The beneficial effects of a 110kV direct-step-down multi-pulse phase-shifting rectifier transformer provided by the present invention are:

[0019] Compared with the prior art, a box body, a coil assembly, a solid insulation assembly and liquid insulation are provided. Three groups of iron core columns are provided in the box body. The coil assembly includes a low-voltage coil group and a high-voltage coil group. The low-voltage coil group is provided on the outside of the iron core column, the insulating paper tube assembly is provided on the outside of the low-voltage coil group, and the high-voltage coil group is provided on the outside of the insulating paper tube assembly. The solid insulation assembly includes a low-voltage side insulation group, an insulating paper tube assembly and a high-voltage side insulation group. The low-voltage side insulation group includes a low-voltage upper insulation group and a low-voltage lower insulation group. The low-voltage upper insulation group and the low-voltage lower insulation group are respectively arranged at the upper and lower ends of the low-voltage coil group. The high-voltage side insulation group includes a high-voltage upper insulation group and a high-voltage lower insulation group. The high-voltage upper insulation group and the high-voltage lower insulation group are respectively arranged at the upper and lower ends of the high-voltage coil group. The insulating paper tube assembly is arranged between the low-voltage coil group and the high-voltage coil group to insulate and isolate the low-voltage coil group and the high-voltage coil group. Liquid insulation is filled between the coil assembly and the solid insulation assembly. The solid insulation assembly is immersed in the liquid insulation to further enhance the insulation effect and meet the withstand voltage performance of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1 A schematic diagram of the internal structure of a 110kV direct-step-down multi-pulse phase-shifting rectifier transformer provided in an embodiment of the present invention.

[0022] In the figure: 1, first low-voltage upper end ring; 2, second low-voltage upper end ring; 3, first low-voltage coil; 4, low-voltage middle end ring; 5, second low-voltage coil; 6, third low-voltage coil; 7, first low-voltage lower end ring; 8, bottom end ring; 9, pad; 10, first paper tube; 11, shielding body; 12, second paper tube; 13, first isolation paper tube; 14, second isolation paper tube; 15, third isolation paper tube; 16, second high-voltage lower end ring; 17, second high-voltage lower corner ring; 18, first high-voltage lower end ring; 19, first high-voltage Lower angle ring; 20, phase partition; 21, first support bar; 22, third high-voltage coil; 23, second support bar; 24, third support bar; 25, second high-voltage coil; 26, first high-voltage coil; 27, third high-voltage upper end ring; 28, second high-voltage upper end ring; 29, first high-voltage upper end ring; 30, top pressure plate; 31, top pressure block; 32, high-voltage upper end angle ring; 33, core column; 34, second low-voltage lower end ring; 35, first high-voltage upper angle ring; 36, second high-voltage upper angle ring; 37, high-voltage lower angle ring. DETAILED DESCRIPTION

[0023] 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 used to limit the present invention.

[0024] Please refer to Figure 1 A specific embodiment of a 110kV direct-step-down multi-pulse phase-shifting rectifier transformer provided by the present invention is now described, comprising a box, a coil assembly, a solid insulation assembly and a liquid insulation, wherein three groups of iron core columns 33 are arranged in the box; the coil assembly comprises a low-voltage coil assembly and a high-voltage coil assembly, wherein the low-voltage coil assembly is wound on the outside of the iron core column 33, and the high-voltage coil assembly is wound on the outside of the low-voltage coil assembly; the solid insulation assembly comprises a low-voltage side insulation group, an insulation paper tube assembly and a high-voltage side insulation group, wherein the low-voltage side insulation group comprises a low-voltage upper insulation group and a low-voltage lower insulation group, wherein the low-voltage upper insulation group is arranged above the low-voltage coil assembly, and the low-voltage lower insulation group is arranged below the low-voltage coil assembly, and the insulation paper tube assembly is sleeved on the outside of the low-voltage coil assembly, and the high-voltage side insulation group comprises a high-voltage upper insulation group and a high-voltage lower insulation group, wherein the high-voltage upper insulation group is arranged above the high-voltage coil assembly, and the high-voltage lower insulation group is arranged below the high-voltage coil assembly; and the liquid insulation is filled between the coil assembly and the solid insulation assembly.

[0025] A 110kV direct-step-down multi-pulse phase-shifting rectifier transformer provided by the present invention is provided with a box, a coil assembly, a solid insulation assembly and a liquid insulation, three groups of iron core columns 33 are provided in the box, the coil assembly includes a low-voltage coil assembly and a high-voltage coil assembly, a low-voltage coil assembly is provided on the outside of the iron core column 33, an insulating paper tube assembly is provided on the outside of the low-voltage coil assembly, a high-voltage coil assembly is provided on the outside of the insulating paper tube assembly, the solid insulation assembly includes a low-voltage side insulation assembly, an insulating paper tube assembly and a high-voltage side insulation assembly, the low-voltage side insulation assembly includes a low-voltage upper insulation assembly and The low-voltage lower insulation group, the low-voltage upper insulation group and the low-voltage lower insulation group are respectively arranged at the upper and lower ends of the low-voltage coil group, the high-voltage side insulation group includes the high-voltage upper insulation group and the high-voltage lower insulation group, the high-voltage upper insulation group and the high-voltage lower insulation group are respectively arranged at the upper and lower ends of the high-voltage coil group, the insulating paper tube assembly is arranged between the low-voltage coil group and the high-voltage coil group to insulate the low-voltage coil group and the high-voltage coil group, liquid insulation is filled between the coil assembly and the solid insulation assembly, the solid insulation assembly is immersed in the liquid insulation, further enhancing the insulation effect to meet the transformer withstand voltage performance.

[0026] For details, please refer to Figure 1, including a box body, a coil assembly, a solid insulation assembly and a liquid insulation, three groups of iron core columns 33 are arranged in the box body, the coil assembly includes a low-voltage coil group and a high-voltage coil group, the solid insulation assembly includes a low-voltage side insulation group, an insulation paper tube assembly and a high-voltage side insulation group, the low-voltage side insulation group includes a low-voltage upper insulation group and a low-voltage lower insulation group, the high-voltage side insulation group includes a high-voltage upper insulation group and a high-voltage lower insulation group, the low-voltage coil group is arranged on the outside of the iron core column 33, the low-voltage upper insulation group and the low-voltage lower insulation group are respectively arranged at the upper and lower ends of the low-voltage coil group, the low-voltage coil group includes a first low-voltage coil 3, a second low-voltage coil 5 and a third low-voltage coil 6 arranged sequentially from top to bottom, and a low-voltage coil 3 is arranged between the first low-voltage coil 3 and the second low-voltage coil 5. The middle end ring 4, the first low-voltage coil 3 includes a first basic coil and a first phase-shifting coil, the third low-voltage coil 6 includes a third basic coil and a third phase-shifting coil, the first phase-shifting coil and the third phase-shifting coil have different phase-shifting angles, the insulating paper tube assembly is arranged on the outside of the low-voltage coil group, the high-voltage side insulation group is arranged on the outside of the insulating paper tube assembly, the high-voltage coil group includes a first high-voltage coil 26, a second high-voltage coil 25 and a third high-voltage coil 22 arranged sequentially from top to bottom, a phase partition 20 is arranged on the outside of the high-voltage coil group, the phase partition 20 isolates adjacent high-voltage coil groups, liquid insulation is filled between the coil assembly and the solid insulation assembly, the solid insulation assembly is immersed in liquid insulation, further enhancing the insulation effect to meet the transformer withstand voltage performance.

[0027] For further information, please refer to Figure 1 A high-voltage upper angle ring 32 is provided at the upper end of the high-voltage coil group, and a high-voltage lower angle ring 37 is provided at the lower end of the high-voltage coil group. The high-voltage upper angle ring 32 and the high-voltage lower angle ring 37 are symmetrically arranged.

[0028] As a specific implementation of a 110kV direct-step-down multi-pulse phase-shifting rectifier transformer provided by the present invention, please refer to Figure 1 The low-voltage upper insulation group includes multiple groups of low-voltage upper end rings arranged sequentially from top to bottom, and the low-voltage lower insulation group includes multiple groups of low-voltage lower end rings arranged sequentially from top to bottom.

[0029] For details, please refer to Figure 1 The low-voltage upper insulation group includes a plurality of groups of low-voltage upper end rings arranged sequentially from top to bottom, and the low-voltage upper end rings include pads and paper rings. The pads are arranged on the upper end surface and / or the lower end surface of the paper ring. The number and specifications of the low-voltage upper end rings are selected according to actual needs. The low-voltage lower insulation group includes a plurality of groups of low-voltage lower end rings arranged sequentially from top to bottom, and the low-voltage lower end rings include pads and paper rings. The pads are arranged on the upper end surface and / or the lower end surface of the paper ring. The number and specifications of the low-voltage lower end rings are selected according to actual needs.

[0030] For details, please refer to Figure 1The low-voltage upper insulation group includes two groups of low-voltage upper end rings arranged sequentially from top to bottom, namely the first low-voltage upper end ring 1 and the second low-voltage upper end ring 2, and the low-voltage lower insulation group includes two groups of low-voltage lower end rings arranged sequentially from top to bottom, namely the first low-voltage lower end ring 7 and the second low-voltage lower end ring 34.

[0031] As a specific implementation of a 110kV direct-step-down multi-pulse phase-shifting rectifier transformer provided by the present invention, please refer to Figure 1 The insulating paper tube assembly includes a shielding paper tube group and a supporting paper tube group. The shielding paper tube group is sleeved on the outside of the low-voltage coil group, and the supporting paper tube group is sleeved on the outside of the shielding paper tube group.

[0032] For details, please refer to Figure 1 The insulating paper tube assembly includes a shielding paper tube group and a supporting paper tube group. The shielding paper tube group is sleeved on the outside of the low-voltage coil group. The shielding paper tube group has a shielding effect. The shielding paper tube group is grounded to prevent the high-voltage coil group from inducing the low-voltage coil group through parasitic capacitance, thereby protecting the low-voltage side electronic devices. A supporting paper tube group is sleeved on the outside of the shielding paper tube group. The supporting paper tube group is used to strengthen the isolation effect between the low-voltage coil group and the high-voltage coil group.

[0033] As a specific implementation of a 110kV direct-step-down multi-pulse phase-shifting rectifier transformer provided by the present invention, please refer to Figure 1 The shielding paper tube set includes a first paper tube 10 and a second paper tube 12 , and a shielding body 11 is arranged between the first paper tube 10 and the second paper tube 12 .

[0034] For details, please refer to Figure 1 The shielding paper tube group includes a first paper tube 10, a shielding body 11 and a second paper tube 12. The shielding body 11 is arranged between the first paper tube 10 and the second paper tube 12. The first paper tube 10 is sleeved on the outside of the low-voltage coil group, the shielding body 11 is arranged on the outside of the first paper tube 10, and the second paper tube 12 is sleeved on the outside of the shielding body 11. The shielding body 11 is wound with copper tape, and the shielding body 11 is grounded to have a shielding effect.

[0035] As a specific implementation of a 110kV direct-step-down multi-pulse phase-shifting rectifier transformer provided by the present invention, please refer to Figure 1 The supporting paper tube group includes multiple groups of isolation paper tubes and multiple groups of isolation struts. The isolation paper tubes and isolation struts are arranged at intervals. One group of isolation struts is arranged on the side of the second paper tube 12 away from the first paper tube 10, and the isolation paper tube is arranged on the side of the isolation struts away from the first paper tube 10.

[0036] For details, please refer to Figure 1 The supporting paper tube group includes multiple groups of isolation paper tubes and isolation struts arranged at intervals. A strut is arranged on the outside of the second paper tube 12, and an isolation paper tube is sleeved on the outside of the strut. A strut is arranged on the outside of the isolation paper tube. The operation is repeated, and the high-voltage coil group is sleeved on the outside of the outermost isolation paper tube.

[0037] For details, please refer to Figure 1 Three groups of support bars and three groups of isolation paper tubes are sleeved on the outside of the low-voltage coil group, which are the first support bar 21, the first isolation paper tube 13, the second support bar 23, the second isolation paper tube 14, the third support bar 24, and the third isolation paper tube 15, which are sequentially sleeved on the outside of the low-voltage coil group. The high-voltage coil group is sleeved on the outside of the third isolation paper tube 15.

[0038] As a specific implementation of a 110kV direct-step-down multi-pulse phase-shifting rectifier transformer provided by the present invention, please refer to Figure 1 The high-voltage upper insulation group includes multiple groups of high-voltage upper end rings and multiple groups of high-voltage upper angle rings arranged from top to bottom, and high-voltage upper end rings are arranged between adjacent high-voltage upper angle rings. The high-voltage lower insulation group includes multiple groups of high-voltage lower end rings and multiple groups of high-voltage lower angle rings arranged from top to bottom, and high-voltage lower end rings are arranged between adjacent high-voltage lower angle rings.

[0039] For details, please refer to Figure 1 The high-voltage upper insulation group includes multiple groups of high-voltage upper end rings and multiple groups of high-voltage upper angle rings arranged from top to bottom, and a high-voltage upper end ring is arranged between adjacent high-voltage upper angle rings. The high-voltage upper end ring includes a pad and a paper ring. The pad is arranged on the upper end surface and / or the lower end surface of the paper ring. The number and specifications of the high-voltage upper end rings are selected according to actual needs. The high-voltage lower insulation group includes multiple groups of high-voltage lower end rings and multiple groups of high-voltage lower angle rings arranged from top to bottom, and a high-voltage lower end ring is arranged between adjacent high-voltage lower angle rings. The high-voltage lower end ring includes a pad and a paper ring. The pad is arranged on the upper end surface and / or the lower end surface of the paper ring. The number and specifications of the high-voltage lower end rings are selected according to actual needs.

[0040] For details, please refer to Figure 1 The high-voltage upper insulation group includes three groups of high-voltage upper end rings and two groups of high-voltage upper angle rings, which are the first high-voltage upper end ring 29, the second high-voltage upper end ring 28, the first high-voltage upper angle ring 35, the third high-voltage upper end ring 27, and the second high-voltage upper angle ring 36 arranged in sequence from top to bottom. The first high-voltage upper angle ring 35 is covered on the outside of the second high-voltage upper angle ring 36. The high-voltage lower insulation group includes two groups of high-voltage lower end rings, which are the first high-voltage lower angle ring 19, the first high-voltage lower end ring 18, the second high-voltage lower angle ring 17, and the second high-voltage lower end ring 16 arranged in sequence from top to bottom. The second high-voltage lower angle ring 17 is covered on the outside of the first high-voltage lower angle ring 19.

[0041] As a specific implementation of a 110kV direct-step-down multi-pulse phase-shifting rectifier transformer provided by the present invention, please refer to Figure 1 The high-pressure upper angle ring includes a high-pressure upper horizontal ring and a high-pressure upper vertical ring. The high-pressure upper vertical ring is arranged on the lower end surface of the high-pressure upper horizontal ring and along the inner circumference of the high-pressure upper horizontal ring. The high-pressure lower angle ring is symmetrically arranged with the high-pressure upper angle ring.

[0042] For details, please refer to Figure 1 The high-pressure upper angle ring includes a horizontal high-pressure upper horizontal ring and a vertical high-pressure upper vertical ring. The high-pressure upper vertical ring is vertically arranged on the lower end face of the high-pressure upper horizontal ring and on the inner circumference of the high-pressure upper horizontal ring. The high-pressure lower angle ring is arranged opposite to the high-pressure upper angle ring, and the high-pressure lower vertical ring of the high-pressure lower angle ring is vertically arranged on the upper end face of the high-pressure lower horizontal ring.

[0043] As a specific implementation of a 110kV direct-step-down multi-pulse phase-shifting rectifier transformer provided by the present invention, please refer to Figure 1 The lower end of the high-pressure upper vertical ring is located in the gap between two adjacent groups of isolation paper tubes.

[0044] For details, please refer to Figure 1 The lower end of the high-pressure upper vertical ring is located in the gap between two adjacent groups of isolation paper tubes and above the support bar, and the upper end of the high-pressure lower vertical ring is located in the gap between two adjacent groups of isolation paper tubes and below the support bar.

[0045] For details, please refer to Figure 1 The first high-pressure upper vertical ring of the first high-pressure upper angle ring 35 is located between the first isolation paper tube 13 and the second isolation paper tube 14, and is located above the second support bar 23. The second high-pressure upper vertical ring of the second high-pressure upper angle ring 36 is located between the second isolation paper tube 14 and the third isolation paper tube 15, and is located above the third support bar 24. The first high-pressure upper vertical ring of the first high-pressure lower angle ring 19 is located between the second isolation paper tube 14 and the third isolation paper tube 15, and is located below the third support bar 24. The second high-pressure lower vertical ring of the second high-pressure lower angle ring 17 is located between the first isolation paper tube 13 and the second isolation paper tube 14, and is located below the second support bar 23.

[0046] As a specific implementation of a 110kV direct-step-down multi-pulse phase-shifting rectifier transformer provided by the present invention, please refer to Figure 1 A bottom end ring 8 is provided at the lower ends of the low-voltage coil group and the high-voltage coil group, and a pad 9 is provided at the lower end of the bottom end ring 8.

[0047] For details, please refer to Figure 1 The bottom end ring 8 is arranged at the lower end of the low-voltage lower insulation group and the high-voltage lower insulation group to support the low-voltage lower insulation group and the high-voltage lower insulation group. The bottom end ring 8 includes a pad and a paper ring. The pad is arranged on the upper end surface and / or the lower end surface of the paper ring. The specifications of the bottom end ring 8 are selected according to actual needs. The pad 9 is arranged on the lower end surface of the bottom end ring 8.

[0048] As a specific implementation of a 110kV direct-step-down multi-pulse phase-shifting rectifier transformer provided by the present invention, please refer to Figure 1A top pressing plate 30 is provided at the upper ends of the low-voltage upper insulation group and the high-voltage upper insulation group, and a top pressing block 31 is provided at the upper end of the top pressing plate 30 .

[0049] For details, please refer to Figure 1 The top pressure plate 30 is arranged at the upper end of the low-voltage upper insulation group and the high-voltage upper insulation group, covering the upper end of the low-voltage upper insulation group and the high-voltage upper insulation group. The top pressure block 31 is arranged on the upper end surface of the top pressure plate 30 to apply pressure to the top pressure plate 30. The top pressure plate 30 cooperates with the pad 9 to apply a clamping force to the components in the middle thereof to increase the stability of the device.

[0050] 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 110kV direct-step-down multi-pulse phase-shifting rectifier transformer, characterized in that: include: A box body, wherein three groups of iron core columns are arranged in the box body; A coil assembly, the coil assembly comprising a low-voltage coil group and a high-voltage coil group, the low-voltage coil group is wound on the outside of the core column, and the high-voltage coil group is wound on the outside of the low-voltage coil group; A solid insulation component, the solid insulation component includes a low-voltage side insulation group, an insulation paper tube component and a high-voltage side insulation group, the low-voltage side insulation group includes a low-voltage upper insulation group and a low-voltage lower insulation group, the low-voltage upper insulation group is arranged above the low-voltage coil group, the low-voltage lower insulation group is arranged below the low-voltage coil group, the insulation paper tube component is sleeved on the outside of the low-voltage coil group, the high-voltage side insulation group includes a high-voltage upper insulation group and a high-voltage lower insulation group, the high-voltage upper insulation group is arranged above the high-voltage coil group, and the high-voltage lower insulation group is arranged below the high-voltage coil group, the insulation paper tube component includes a shielding paper tube group and a supporting paper tube group, the shielding paper tube group is sleeved on the outside of the low-voltage coil group, the shielding paper tube group is grounded, the supporting paper tube group is sleeved on the outside of the shielding paper tube group, the shielding paper tube group includes a first paper tube and a second paper tube, a shielding body is arranged between the first paper tube and the second paper tube, the shielding body is wound with copper tape, The supporting paper tube group includes multiple groups of isolation paper tubes and multiple groups of isolation struts, the isolation paper tubes and the isolation struts are arranged at intervals, one group of isolation struts is arranged on the side of the second paper tube away from the first paper tube, and the isolation paper tube is arranged on the side of the isolation struts away from the first paper tube, the high-voltage upper insulation group includes multiple groups of high-voltage upper end rings and multiple groups of high-voltage upper angle rings arranged from top to bottom, and the high-voltage upper end rings are arranged between adjacent high-voltage upper angle rings, the high-voltage lower insulation group includes multiple groups of high-voltage lower end rings and multiple groups of high-voltage lower angle rings arranged from top to bottom, and the high-voltage lower end rings are arranged between adjacent high-voltage lower angle rings, the high-voltage upper angle ring includes a high-voltage upper horizontal ring and a high-voltage upper vertical ring, the high-voltage upper vertical ring is arranged on the lower end surface of the high-voltage upper horizontal ring, and is arranged along the inner circumference of the high-voltage upper horizontal ring, the high-voltage lower angle ring is symmetrically arranged with the high-voltage upper angle ring, and the lower end of the high-voltage upper vertical ring is located in the gap between two adjacent groups of the isolation paper tubes; and Liquid insulation is filled between the coil assembly and the solid insulation assembly.

2. A 110kV direct-step-down multi-pulse phase-shifting rectifier transformer as claimed in claim 1, characterized in that: The low-voltage upper insulation group includes a plurality of groups of low-voltage upper end rings arranged sequentially from top to bottom, and the low-voltage lower insulation group includes a plurality of groups of low-voltage lower end rings arranged sequentially from top to bottom.

3. A 110kV direct-step-down multi-pulse phase-shifting rectifier transformer as claimed in claim 1, characterized in that: The lower ends of the low-voltage coil group and the high-voltage coil group are provided with bottom end rings, and the lower ends of the bottom end rings are provided with pads.

4. A 110kV direct-step-down multi-pulse phase-shifting rectifier transformer as claimed in claim 1, characterized in that: A top pressing plate is arranged at the upper ends of the low-voltage upper insulation group and the high-voltage upper insulation group, and a top pressing block is arranged at the upper end of the top pressing plate.

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