An explosion-proof converter transformer layout structure

Abstract

This invention relates to an explosion-proof converter transformer layout structure, wherein the transformer body includes an iron core with core columns, and a voltage regulating coil, a grid coil, and a valve coil are arranged sequentially from the inside to the outside on the core column; the valve coil on the core column near the firewall has valve a connected to the valve a oil-gas bushing via valve a output line, and valve b connected to the valve b oil-gas bushing via valve b output line; one end of the grid coil is connected to the grid-side bushing, and the other end is connected to the voltage regulating coil; the voltage regulating coil is controlled by an on-load tap changer located on the oil tank, and the on-load tap changer is connected to the grid-side neutral point bushing; the valve a oil-gas bushing and the valve b oil-gas bushing are respectively connected to their corresponding through-wall bushings, and the through-wall bushings of different converter transformers are connected to each other through wiring adjustment bushings according to different wiring requirements. This invention simplifies the bushing output structure while meeting explosion-proof requirements, and can achieve different output methods by using through-wall bushings and wiring adjustment bushings in combination.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, specifically to an explosion-proof converter transformer layout structure. Background Technology

[0002] Traditional DC transmission projects typically employ a dual twelve-pulse topology, with oil-air bushings generally used for the valve-side bushings of their converter transformers. When using oil-air bushings on the valve side, transformer oil can enter the valve hall through the bushing. However, in the event of a major fault such as a short circuit in the converter transformer, it can experience a deflagration. During this deflagration, transformer oil may also enter the valve hall through the oil-air bushing, potentially causing a fire or other major accident in the valve hall, resulting in significant losses.

[0003] Furthermore, when using oil-air bushings, the external insulation distance between the grid side and the valve side air side needs to be considered, especially for UHVDC converter transformers. In existing technologies, to ensure the external insulation distance on the air side, the bushing is generally set with a spatial tilt angle. However, this makes the structure of the leads in the converter transformer oil and the connection between the leads and the outgoing line device very complex, increasing the design and installation difficulty. Summary of the Invention

[0004] The purpose of this invention is to provide an explosion-proof converter transformer layout structure that uses an oil-air bushing instead of the oil-air bushing in the prior art. While meeting explosion-proof requirements, it simplifies the bushing outlet structure, reduces design and installation difficulty, and allows for different outlet methods to be achieved by using through-wall bushings and wiring adjustment bushings, thus improving design and usage flexibility.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] An explosion-proof converter transformer layout includes an oil tank, with the transformer body located inside the tank. Outside the oil tank are valve a oil-gas bushing, valve b oil-gas bushing, a grid-side bushing, and a grid-side neutral point bushing. The transformer body includes an iron core with a core column, on which a voltage regulating coil, a grid coil, and a valve coil are sequentially arranged from the inside out. The valve coil on the core column near the firewall is connected to the valve a oil-gas bushing via a valve a lead wire on the valve a side and to the valve b oil-gas bushing via a valve b lead wire on the valve b side. One end of the grid coil is connected to the grid-side bushing, and the other end is connected to the voltage regulating coil. The voltage regulating coil is controlled by an on-load tap changer located on the oil tank, and the on-load tap changer is connected to the grid-side neutral point bushing. The valve a oil-gas bushing and valve b oil-gas bushing are respectively connected to their corresponding through-wall bushings, and the through-wall bushings of different converter transformers are connected via adjusting bushings according to different wiring requirements. The valve a oil-gas bushing and valve b oil-gas bushing are arranged in parallel.

[0007] The oil tank is equipped with valve a riser seat and valve b riser seat on the side near the firewall. The valve a oil and gas sleeve is installed on the valve a riser seat, and the valve b oil and gas sleeve is installed on the valve b riser seat. The upper side of the oil tank is equipped with a mesh side riser seat and a mesh side neutral point riser seat. The mesh side sleeve is installed on the mesh side riser seat, and the mesh side neutral point sleeve is installed on the mesh side neutral point riser seat. Shielding pipes are provided on the outer side of both the valve a oil and gas sleeve and the valve b oil and gas sleeve.

[0008] The through-wall sleeve has a through-wall core inside, and the ends of the oil and gas sleeves of valve a and valve b are respectively connected to the through-wall core inside the corresponding through-wall sleeve; the through-wall sleeve is provided with a first adjusting flange, the wiring adjusting sleeve has second adjusting flanges at both ends and an adjusting core inside, the second adjusting flange is connected to the first adjusting flange on the corresponding through-wall sleeve, and the adjusting core is electrically connected to the through-wall core inside the corresponding through-wall sleeve; when the through-wall sleeve does not need to be connected to the wiring adjusting sleeve, the first adjusting flange on the through-wall sleeve is sealed by a sealing flange.

[0009] The free end of the through-wall sleeve is provided with an outer sleeve flange, and the outer sleeve flange is connected to the flange at the end of the outer sleeve; when the free end of the through-wall sleeve does not need to be connected to the outer sleeve, the outer sleeve flange on the through-wall sleeve is sealed by a sealing flange; the through-wall sleeve is a GIL sleeve.

[0010] The valve a outlet and valve b outlet are arranged in parallel and are mounted on a shielded tube mounting bracket, which is installed in the oil tank. The shielded tube mounting bracket includes a mounting column, an adjusting mounting seat, and a fixed seat. The mounting column is fixed in the oil tank, the adjusting mounting seat is adjustable in height and is mounted on the corresponding mounting column, and the fixed seat is mounted on the corresponding adjusting mounting seat. A shim for fine-tuning the height is provided between the fixed seat and the corresponding adjusting mounting seat. The valve a outlet and valve b outlet pass through the corresponding fixed seat.

[0011] The adjustable mounting base includes a vertical part and a horizontal part. The mounting column has multiple sets of adjustable mounting holes along its length. The vertical part is fixed to a corresponding set of adjustable mounting holes by bolts. The fixed base is fixed to the horizontal part, and an adjusting shim is provided between the fixed base and the horizontal part. A fixing sleeve is provided on the upper side of the fixed base, and the fixing sleeve is fixed to the fixed base by a fixing hoop.

[0012] The iron core is a single-phase three-column, single-phase four-column, or single-phase five-column structure.

[0013] When the core is a single-phase four-column or single-phase five-column structure, the valve coils on the valve a side of two adjacent core columns are connected through the valve a connection line, and the valve b side is connected through the valve b connection line; one end of the grid coil on each core column is connected to the grid side bushing, and the other end is connected to the corresponding voltage regulating coil; each voltage regulating coil is controlled by the corresponding on-load tap changer, and each on-load tap changer is connected to the grid side neutral point bushing.

[0014] Both the outer side of the valve a connection line and the outer side of the valve b connection line are equipped with shielding tubes.

[0015] An oil storage tank is provided on the upper side of the oil tank, and the oil storage tank is connected to the inside of the oil tank; a cooler is provided on the side of the oil tank away from the firewall, and the inside of the oil tank is connected to the cooler through a connecting pipe.

[0016] The advantages and positive effects of this invention are as follows:

[0017] 1. This invention utilizes valve a and valve b oil-gas bushings to replace the existing oil-air bushings for transformer body outgoing lines. Firstly, because the insulation strength of the insulating medium (oil, SF6, etc.) inside the oil-gas bushing is higher than that of air, the structure is more compact. It also allows valve a and valve b oil-gas bushings to be led out horizontally and parallel, and the grounding portion at the bushing flange does not need to pass through a firewall. This simplifies the overall installation structure of the transformer body outgoing bushing and eliminates the need to consider the bushing's tilt angle, reducing design and installation difficulty. Secondly, because one side of the oil-gas bushing (transformer side) is immersed in transformer oil, and the other side (valve hall side) is in an insulating gas environment (such as SF6), it can simultaneously achieve electrical connection between the transformer and the valve hall while sealing and isolating the two insulating media (oil and gas). Therefore, it can minimize the risk of transformer oil entering the valve hall and causing a fire after a transformer explosion.

[0018] 2. This invention can utilize through-wall bushings and wiring adjustment bushings to form different wiring methods such as Y-connections or D-connections as needed. This reduces the number of bushings inserted into the valve hall, thus saving valve hall space and reducing the amount of hardware used, while also improving the design and usage flexibility of this invention. When a wiring adjustment bushing needs to be connected, the second adjustment flanges at both ends of the wiring adjustment bushing are connected to the first adjustment flanges on the corresponding through-wall bushings, thereby achieving electrical connection between the adjustment core inside the wiring adjustment bushing and the through-wall core inside the corresponding through-wall bushing. When the through-wall bushing does not need to be connected to the wiring adjustment bushing, or when the free end of the through-wall bushing does not need to be electrically connected to the outer sleeve, the first adjustment flange on the through-wall bushing or the flange on the outer sleeve can be used for insulation sealing as needed via a sealing flange.

[0019] 3. In order to meet the need for the various wiring adjustment sleeves to be staggered at different heights, and also to meet the need for flexible adjustment during on-site installation, the shielded tube mounting bracket of the present invention can be used to adjust the height of the outlet of valve a and valve b. The adjusting mounting base of the shielded tube mounting bracket can adjust the installation height along the mounting column, and the adjusting shims can be used to finely adjust the corresponding outlet height by changing the number of shims.

[0020] 4. The iron core of the device body of this invention can adopt a single-phase three-column, single-phase four-column, or single-phase five-column structure according to different capacity sizes. The coil arrangement of the device body starts from the corresponding core column of the iron core, and from the inside out, it consists of a voltage regulating coil, a grid coil, and a valve coil. Each coil is connected in parallel. The valve coils on adjacent core columns are connected on the valve a side through a valve a connecting line and on the valve b side through a valve b connecting line. On the core column near the firewall, the valve coil on the valve a side is connected to the valve a oil and gas sleeve through the valve a output line and on the valve b side is connected to the valve b oil and gas sleeve 3 through the valve b output line, thus realizing the final lead-out of the valve coil. The above structure can meet the requirements of parallel coil connection while ensuring the compactness of the overall structure of the device body.

[0021] 5. The valve a outlet, valve b outlet, valve a connecting line, and valve b connecting line of the present invention are all equipped with shielding tubes, and the valve a outlet and valve b outlet can further increase the insulation distance between the device body and the valve a oil and gas sleeve and the valve b oil and gas sleeve, which can ensure the internal insulation safety and reliability of the oil tank. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 for Figure 1 Another structural schematic diagram of the present invention from another angle.

[0024] Figure 3 for Figure 2 A schematic diagram of the structural principle of the device body according to an embodiment of the present invention.

[0025] Figure 4 for Figure 3 A schematic diagram illustrating the wiring principle of the coils on a single column of a medium-strength iron core.

[0026] Figure 5 for Figure 3 A schematic diagram illustrating the wiring principle of all coils on a single-phase four-column iron core used in this embodiment of the invention.

[0027] Figure 6 This is a schematic diagram illustrating the wiring principle of all coils on a single-phase five-limb iron core used in another embodiment of the present invention.

[0028] Figure 7 This is a schematic diagram showing the connection between the present invention and the through-wall sleeve.

[0029] Figure 8 for Figure 7 Main view of the connection of the center-mounted adjusting sleeve.

[0030] Figure 9 This is a schematic diagram illustrating the connection principle of one outgoing wire connection method according to the present invention.

[0031] Figure 10 This is a schematic diagram illustrating the connection principle of another outgoing wire connection method according to the present invention.

[0032] Figure 11 for Figure 7 A structural diagram of the center-outlet riser and shielding tube mounting bracket.

[0033] Figure 12 for Figure 11 A structural diagram of the adjusting mounting base and the fixed base.

[0034] Figure 13 This is a top view of the structure of a converter transformer in the prior art.

[0035] Figure 14 for Figure 13 A schematic diagram of the structure at point K in the diagram.

[0036] Figure 15 for Figure 14 Side view of the structure.

[0037] Among them, 1 is the oil tank, 101 is the valve a riser seat, 102 is the valve b riser seat, 103 is the grid-side riser seat, 104 is the grid-side neutral point riser seat, 105 is the on-load tap changer, 106 is the oil conservator, 107 is the cooler, and 1071 is the connecting pipeline; 2 is the valve a oil-gas bushing; 3 is the valve b oil-gas bushing; 4 is the grid-side bushing; 5 is the grid-side neutral point bushing; 6 is the transformer body, 601 is the valve a outlet, 602 is the valve b outlet, 603 is the valve a connection line, 604 is the valve b connection line, 605 is the iron core, and 606 is the voltage regulating coil. 607 is the wire mesh coil, 608 is the valve coil; 7 is the shielded tube mounting bracket, 701 is the mounting column, 702 is the adjusting mounting seat, 7021 is the vertical part, 7022 is the horizontal part, 703 is the fixed seat, 7031 is the adjusting shim, 7032 is the fixing sleeve, 7033 is the fixing clamp; 8 is the through-wall sleeve, 801 is the through-wall core, 802 is the first adjusting flange, 803 is the outer sleeve flange; 9 is the wiring adjusting sleeve, 901 is the adjusting core, 902 is the second adjusting flange; 10 is the firewall; 11 is the outer sleeve. Detailed Implementation

[0038] The invention will now be described in further detail with reference to the accompanying drawings.

[0039] like Figures 1-2As shown, the present invention includes an oil tank 1, and the oil tank 1 contains a body 6. The oil tank 1 has a valve a gas sleeve 2 and a valve b gas sleeve 3 on the side near the firewall 10. The upper side of the oil tank 1 has a mesh-side sleeve 4 and a mesh-side neutral point sleeve 5. Figure 3 As shown, the device body 6 includes an iron core 605 with a core column, and a voltage regulating coil 606, a mesh coil 607, and a valve coil 608 are arranged sequentially from the inside to the outside on the core column. The valve coil 608 on the core column near the firewall 10 is connected to the valve a oil and gas sleeve 2 via the valve a outlet line 601. Figure 3 (As shown in a) the valve is connected, and the valve b side is connected to the valve b oil and gas sleeve 3 via the valve b outlet line 602. Figure 3 (as shown in b) is connected, and one end of the mesh coil 607 is connected to the mesh-side sleeve 4 ( Figure 3 One end is connected to the oil tank (as shown in Figure A), and the other end is connected to the voltage regulating coil 606. The voltage regulating coil 606 is controlled by the on-load tap changer 105 located on the oil tank 1. The on-load tap changer 105 is connected to the neutral point bushing 5 on the grid side. Figure 3 (As shown in B) Connection; as Figures 7-10 As shown, the valve a oil-gas bushing 2 and valve b oil-gas bushing 3 are respectively connected to the corresponding through-wall bushings 8, and the through-wall bushings 8 of different converter transformers are connected to each other through the wiring adjustment bushing 9 according to different wiring requirements; for example Figure 11 As shown, the valve a oil-gas sleeve 2 and valve b oil-gas sleeve 3 are arranged in parallel, and the valve a outlet 601 and valve b outlet 602 are also arranged in parallel; the valve a outlet 601 and valve b outlet 602 are adjustablely mounted on a shielded tube mounting bracket 7, which is located in the oil tank 1.

[0040] like Figures 1-2 As shown, in this embodiment, the oil tank 1 is provided with valve a riser seat 101 and valve b riser seat 102 on the side near the firewall 10. The valve a oil-gas sleeve 2 is provided on the valve a riser seat 101, and the valve b oil-gas sleeve 3 is provided on the valve b riser seat 102. Both valve a oil-gas sleeve 2 and valve b oil-gas sleeve 3 are provided with shielding tubes. Figures 1-2 As shown, in this embodiment, the upper side of the oil tank 1 is provided with a mesh-side riser 103 and a mesh-side neutral point riser 104, and the mesh-side sleeve 4 is provided on the mesh-side riser 103, and the mesh-side neutral point sleeve 5 is provided on the mesh-side neutral point riser 104. The valve a outlet 601, valve b outlet 602, the mesh coil 607 connected to the mesh-side sleeve 4, and the on-load tap changer 105 connected to the mesh-side neutral point sleeve 5 respectively extend into the corresponding riser to achieve electrical connection, which is a well-known technology in the art.

[0041] Furthermore, this invention utilizes an oil-gas casing instead of the oil-air casing in the prior art, wherein, for example... Figures 13-15 As shown, in existing oil-air bushings, due to considerations of the insulation level and external insulation distance of the converter transformer, the valve-side bushing typically needs to be installed with a spatial tilt angle, resulting in a relatively complex structure and greater design and installation difficulty. However, as... Figure 11 As shown, the valve a oil-gas sleeve 2 and valve b oil-gas sleeve 3 used in this invention do not need to consider the external insulation distance issue, and can be led out horizontally and parallel. Meanwhile, as... Figure 7 As shown, this invention mainly utilizes the through-wall bushing 8 (in this embodiment, a GIL bushing) to achieve reversal after passing through the wall. The grounding portions at the flanges of the valve a oil-gas bushing 2 and valve b oil-gas bushing 3 do not need to pass through the firewall, thus simplifying the overall installation structure of the transformer body's outgoing bushings and eliminating the need to consider the bushing's tilt angle during installation, reducing design and installation difficulty. The oil-gas bushing is a well-known technology in the field and is a commercially available product. For example, patent CN1719267A discloses a testing device for oil-gas bushings and oil-air bushings of the same voltage level. Because the insulation strength of the internal insulating medium (oil, SF6, etc.) of the oil-gas bushing is higher than that of air, its insulation distance can be smaller than that of the oil-air bushing, making the structure more compact.

[0042] like Figures 3-6 As shown, the iron core 605 of the device body 6 of the present invention can adopt a single-phase three-column, single-phase four-column, or single-phase five-column structure as needed. When the iron core 605 adopts a single-phase four-column or single-phase five-column structure, the valve a side of the valve coils 608 on two adjacent core columns is connected through valve a connecting line 603 and the valve b side is connected through valve b connecting line 604, thereby realizing the parallel connection of the valve coils 608 on each core column. One end of the grid coil 607 on each core column is connected to the grid side sleeve 4, and the other end is connected to the corresponding voltage regulating coil 606, thereby realizing the parallel connection of the grid coils 607 on each core column. Each voltage regulating coil 606 can be controlled by the corresponding on-load tap changer 105, and each on-load tap changer 105 is connected to the grid side neutral point sleeve 5. In this embodiment, the valve a connecting line 603 and the valve b connecting line 604 are both equipped with shielding tubes. The on-load tap changer 105 is a known technology in the art and a commercially available product.

[0043] like Figures 7-10 As shown, in this embodiment, the wall bushing 8 is a GIL bushing, which is a well-known technology in the art. The GIL bushing is generally part of a gas-insulated metal-enclosed transmission line, consisting of a grounded metal outer shell and an internal tubular metal conductor, with an insulating medium inside. For example... Figure 7As shown, the ends of valve a oil-gas sleeve 2 and valve b oil-gas sleeve 3 can be respectively inserted and connected to the through-wall core 801 inside the corresponding through-wall sleeve 8, thereby further facilitating installation. Additionally, this invention can utilize the wiring adjustment sleeve 9 as needed. Figure 9 and Figure 10 The diagram shows different outgoing cable configurations such as Y-connection or D-connection, among which... Figures 7-8 As shown, in this embodiment, a first adjusting flange 802 is provided at a suitable position on the through-wall sleeve 8, and a second adjusting flange 902 is provided at both ends of the wiring adjusting sleeve 9. The second adjusting flange 902 is connected to the first adjusting flange 802 on the corresponding through-wall sleeve 8, thereby making the adjusting tube core 901 inside the wiring adjusting sleeve 9 electrically connected to the through-wall tube core 801 inside the corresponding through-wall sleeve 8. When the through-wall sleeve 8 does not need to be connected to the wiring adjusting sleeve 9, the first adjusting flange 802 on the through-wall sleeve 8 is connected to a sealing flange by bolts to achieve insulation sealing.

[0044] like Figure 7 As shown, the free end of the through-wall sleeve 8 is provided with an outer sleeve flange 803, and the outer sleeve flange 803 is connected to the flange at the end of the outer sleeve 11, thereby realizing the electrical connection between the through-wall sleeve 8 and the outer sleeve 11, as shown. Figures 9-10 As shown, when the free end of the through-wall sleeve 8 does not need to be electrically connected to the outer sleeve 11, the outer sleeve flange 803 on the through-wall sleeve 8 is also connected to a sealing flange to achieve insulation sealing.

[0045] like Figures 1-2 and Figures 11-12 As shown, in this embodiment, the shielding pipe mounting bracket 7 is provided on the side of the oil tank 1 near the firewall 10. The shielding pipe mounting bracket 7 includes a mounting column 701, an adjusting mounting seat 702, and a fixed seat 703. The mounting column 701 is fixed in the oil tank 1. The adjusting mounting seat 702 is provided on the corresponding mounting column 701 and can be adjusted in height. The fixed seat 703 is provided on the corresponding adjusting mounting seat 702. A fine-tuning shim 7031 is provided between the fixed seat 703 and the corresponding adjusting mounting seat 702. The valve a outlet 601 and the valve b outlet 602 pass through the corresponding fixed seat 703.

[0046] like Figures 11-12As shown, in this embodiment, the adjusting mounting base 702 includes a vertical portion 7021 and a horizontal portion 7022. The mounting column 701 has multiple sets of adjusting mounting holes along its length. The vertical portion 7021 is fixed to a corresponding set of adjusting mounting holes by bolts. The fixing base 703 is fixed to the horizontal portion 7022 by bolts, and a height-adjusting shim 7031 is provided between the fixing base 703 and the horizontal portion 7022 for fine-tuning the height. Additionally, in this embodiment, the upper side of the fixing base 703 has a fixing sleeve 7032 for the shielding tube of the corresponding outgoing line to pass through, and the fixing sleeve 7032 is fixed to the fixing base 703 by a fixing clamp 7033.

[0047] like Figures 9-10 As shown, since this invention can utilize multiple converter transformers to achieve the conversion of wiring methods such as Y-connection or D-connection, the valve a riser seat 101 and valve b riser seat 102 on different converter transformers need to be staggered according to the actual situation. This allows the valve a oil and gas bushing 2 and valve b oil and gas bushing 3 on different converter transformers, along with the corresponding through-wall bushing 8, to be staggered. This allows the various wiring adjustment bushings 9 to be connected at different heights to avoid mutual interference. The shielding tube mounting bracket 7 can further assist in adjusting the height of valve a outlet 601 and valve b outlet 602. The adjusting mounting seat 702 can adjust the installation height along the mounting column 701, and the adjusting shims 7031 can finely adjust the height by changing their quantity, thereby satisfying the purpose of adjusting the height of valve a outlet 601 and valve b outlet 602.

[0048] like Figure 1 As shown, in this embodiment, an oil storage tank 106 is provided on the upper side of the oil tank 1, and the oil storage tank 106 is connected to the interior of the oil tank 1. Additionally, a cooler 107 is provided on the side of the oil tank 1 away from the firewall 10, and the interior of the oil tank 1 is connected to the cooler 107 via a connecting pipe 1071. Both the oil storage tank 106 and the cooler 107 are technologies known in the art.

[0049] The working principle of this invention is as follows:

[0050] This invention is mainly used in GIL DC systems. It utilizes valve a (oil-gas bushing 2) and valve b (oil-gas bushing 3) to replace the existing oil-air bushing for the transformer body 6 output. On the one hand, because the insulation strength of the insulating medium (oil, SF6, etc.) inside the oil-gas bushing is higher than that of air, its insulation distance can be smaller than that of the oil-air bushing, resulting in a more compact structure. Figure 11As shown, the oil-gas bushing 2 for valve a and the oil-gas bushing 3 for valve b can also be led out horizontally in parallel. Simultaneously, the grounding portion at the flange of the oil-gas bushing does not need to pass through the firewall 10. This simplifies the overall installation structure of the bushings leading out of the transformer body 6 and eliminates the need to consider the bushing's tilt angle during installation, reducing design and installation difficulty. Furthermore, since one side (transformer side) of the oil-gas bushing is immersed in transformer oil, and the other side (valve hall side) is in an insulating gas environment (such as SF6), it can achieve electrical connection between the transformer and the valve hall while simultaneously sealing and isolating the two insulating media (oil and insulating gas). Therefore, it can minimize the risk of transformer oil entering the valve hall and causing a fire after a transformer explosion.

[0051] And such Figures 9-10 As shown, this invention can also form different wiring methods such as Y-connection or D-connection in the system as needed. This reduces the number of sleeves inserted into the valve chamber, thus saving valve chamber space and reducing the amount of hardware used, while also improving the design and usage flexibility of this invention. Specifically, this invention first utilizes the through-wall sleeve 8 and the wiring adjustment sleeve 9 to achieve different wiring methods, such as... Figures 7-8 As shown, when the wiring adjustment sleeve 9 needs to be connected, the second adjustment flanges 902 at both ends of the wiring adjustment sleeve 9 are respectively connected to the first adjustment flanges 802 on the corresponding through-wall sleeve 8, thereby realizing the electrical connection between the adjustment core 901 inside the wiring adjustment sleeve 9 and the through-wall core 801 inside the corresponding through-wall sleeve 8. When the through-wall sleeve 8 does not need to be connected to the wiring adjustment sleeve 9, or as... Figures 9-10 As shown, when the free end of the through-wall sleeve 8 does not need to be electrically connected to the outer sleeve 11, the first adjusting flange 802 or the outer sleeve flange 803 on the through-wall sleeve 8 can be connected to the sealing flange by bolts as needed to achieve insulation sealing.

[0052] Secondly, in order to meet the requirement that the various wiring adjustment sleeves 9 can be staggered at different heights, thereby avoiding mutual interference between the wiring adjustment sleeves 9, and also to meet the need for flexible adjustment during on-site installation, the shielded tube mounting bracket 7 of the present invention can further adjust the height of the valve a outlet 601 and valve b outlet 602. The adjusting mounting base 702 can adjust the installation height along the mounting column 701, and the adjusting shims 7031 can finely adjust the height by changing their number.

[0053] Furthermore, the iron core 605 of the device body 6 of this invention can adopt a single-phase three-limb, single-phase four-limb, or single-phase five-limb structure according to the capacity requirements of different wiring methods, wherein the single-phase four-limb structure is as follows: Figure 3 and Figure 5 As shown, it includes two central core columns, and a single-phase five-column configuration is as follows: Figure 6As shown, it includes three core columns in the middle. The coil arrangement of the body 6 is a structure starting from the corresponding core column of the iron core 605, from the inside out, consisting of a voltage regulating coil 606, a mesh coil 607, and a valve coil 608, and each coil is connected in parallel. The valve coils 608 on adjacent core columns are connected on the valve a side through valve a connecting line 603 and on the valve b side through valve b connecting line 604. Furthermore, the valve coil 608 on the core column closer to the firewall 10 is connected on the valve a side through valve a output line 601 to the valve a oil and gas sleeve 2 and on the valve b side through valve b output line 602 to the valve b oil and gas sleeve 3, thus realizing the final lead-out of the valve coil. The above structure not only meets the requirements of parallel coil connection, but also ensures the compactness of the overall structure of the body 6. In addition, shielding tubes are provided on valve a outlet line 601, valve b outlet line 602, valve a connecting line 603, and valve b connecting line 604. At the same time, valve a outlet line 601 and valve b outlet line 602 can further increase the insulation distance between the body 6 and valve a oil and gas sleeve 2 and valve b oil and gas sleeve 3, thus ensuring the internal insulation of the oil tank 1 is safe and reliable.

Claims

1. An explosion-proof converter transformer layout structure, characterized in that: The device includes an oil tank (1), and the inside of the oil tank (1) is a body (6). The outside of the oil tank (1) is provided with a valve a gas sleeve (2), a valve b gas sleeve (3), a mesh side sleeve (4), and a mesh side neutral point sleeve (5). The body (6) includes an iron core (605) with a core column, and the core column is provided with a voltage regulating coil (606), a mesh coil (607), and a valve coil (608) from the inside to the outside. The valve coil (608) on the core column near the firewall (10) is connected to the valve a gas sleeve (2) on the valve a side through the valve a outlet line (601), and to the valve b gas sleeve (2) on the valve b side through the valve b outlet line (602). The pipe (3) is connected, one end of the grid coil (607) is connected to the grid side bushing (4), and the other end is connected to the voltage regulating coil (606). The voltage regulating coil (606) is controlled by the on-load tap changer (105) located on the oil tank (1). The on-load tap changer (105) is connected to the grid side neutral point bushing (5). The valve a oil-gas bushing (2) and valve b oil-gas bushing (3) are respectively connected to the corresponding through-wall bushing (8). The through-wall bushings (8) of different converter transformers are connected to each other through the wiring adjustment bushing (9) according to different wiring requirements. The valve a oil-gas bushing (2) and valve b oil-gas bushing (3) are arranged in parallel.

2. The explosion-proof converter transformer arrangement structure according to claim 1, characterized in that: The oil tank (1) is provided with valve a riser seat (101) and valve b riser seat (102) on the side near the firewall (10). The valve a oil and gas sleeve (2) is provided on the valve a riser seat (101), and the valve b oil and gas sleeve (3) is provided on the valve b riser seat (102). The upper side of the oil tank (1) is provided with a net side riser seat (103) and a net side neutral point riser seat (104). The net side sleeve (4) is provided on the net side riser seat (103), and the net side neutral point sleeve (5) is provided on the net side neutral point riser seat (104). Shielding pipes are provided on the outside of the valve a oil and gas sleeve (2) and the outside of the valve b oil and gas sleeve (3).

3. The explosion-proof converter transformer arrangement structure according to claim 1, characterized in that: The wall sleeve (8) is provided with a wall core (801) inside, and the ends of the valve a oil and gas sleeve (2) and the valve b oil and gas sleeve (3) are respectively connected to the wall core (801) inside the corresponding wall sleeve (8); the wall sleeve (8) is provided with a first adjusting flange (802), the wiring adjusting sleeve (9) is provided with a second adjusting flange (902) at both ends and an adjusting core (901) inside, the second adjusting flange (902) is connected to the first adjusting flange (802) on the corresponding wall sleeve (8), and the adjusting core (901) is electrically connected to the wall core (801) inside the corresponding wall sleeve (8); when the wall sleeve (8) does not need to be connected to the wiring adjusting sleeve (9), the first adjusting flange (802) on the wall sleeve (8) is sealed by a sealing flange.

4. The explosion-proof converter transformer arrangement structure according to claim 3, characterized in that: The free end of the through-wall sleeve (8) is provided with an outer sleeve flange (803), and the outer sleeve flange (803) is connected to the flange at the end of the outer sleeve (11); when the free end of the through-wall sleeve (8) does not need to be connected to the outer sleeve (11), the outer sleeve flange (803) on the through-wall sleeve (8) is sealed by a sealing flange; the through-wall sleeve (8) is a GIL sleeve.

5. The explosion-proof converter transformer arrangement structure according to claim 1, characterized in that: The valve a outlet (601) and valve b outlet (602) are arranged in parallel, and the valve a outlet (601) and valve b outlet (602) are mounted on a shielded tube mounting bracket (7), which is located in the oil tank (1). The shielded tube mounting bracket (7) includes a mounting column (701), an adjusting mounting seat (702), and a fixed seat (703). The mounting column (701) is fixed in the oil tank (1), the adjusting mounting seat (702) is adjustable in height on the corresponding mounting column (701), and the fixed seat (703) is located on the corresponding adjusting mounting seat (702). A height adjustment shim (7031) is provided between the fixed seat (703) and the corresponding adjusting mounting seat (702). The valve a outlet (601) and valve b outlet (602) pass through the corresponding fixed seat (703).

6. The explosion-proof converter transformer arrangement structure according to claim 5, characterized in that: The adjusting mounting base (702) includes a vertical part (7021) and a horizontal part (7022). The mounting column (701) is provided with multiple sets of adjusting mounting holes along the length direction. The vertical part (7021) is fixed to the corresponding set of adjusting mounting holes by bolts. The fixing base (703) is fixed to the horizontal part (7022), and an adjusting shim (7031) is provided between the fixing base (703) and the horizontal part (7022). A fixing sleeve (7032) is provided on the upper side of the fixing base (703), and the fixing sleeve (7032) is fixed to the fixing base (703) by a fixing hoop (7033).

7. The explosion-proof converter transformer arrangement structure according to claim 1, characterized in that: The iron core (605) is a single-phase three-column, single-phase four-column, or single-phase five-column structure.

8. The explosion-proof converter transformer arrangement structure according to claim 7, characterized in that: When the iron core (605) is a single-phase four-column or single-phase five-column structure, the valve coils (608) on two adjacent core columns are connected on the valve a side through the valve a connecting line (603) and on the valve b side through the valve b connecting line (604); one end of the grid coil (607) on each core column is connected to the grid side bushing (4), and the other end is connected to the corresponding voltage regulating coil (606); each voltage regulating coil (606) is controlled by the corresponding on-load tap changer (105), and each on-load tap changer (105) is connected to the grid side neutral point bushing (5).

9. The explosion-proof converter transformer arrangement structure according to claim 8, characterized in that: A shielding tube is provided on the outside of the valve a connection line (603) and the valve b connection line (604).

10. The explosion-proof converter transformer arrangement structure according to claim 1, characterized in that: The oil tank (1) is provided with an oil storage tank (106) on its upper side, and the oil storage tank (106) is connected to the inside of the oil tank (1); a cooler (107) is provided on the side of the oil tank (1) away from the firewall (10), and the inside of the oil tank (1) is connected to the cooler (107) through a connecting pipe (1071).

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