Three-phase integrated current transformer riser

Abstract

The application discloses a three-phase integrated current transformer riser, and relates to the technical field of transformers, which comprises a box wall in the shape of a rectangular cavity, an upper flange arranged at the top of the box wall, a lower flange arranged at the bottom of the box wall, a gas pipe joint arranged at one side of the box wall, and a first cover plate for plugging the gas pipe joint, wherein the upper flange is provided with an opening for placing a current transformer, the box wall comprises a first anti-magnetic steel plate, a first bending plate, a second bending plate and a second anti-magnetic steel plate connected in sequence, a partition plate is vertically arranged in the box wall to form a containing cavity for containing the current transformer, and a supporting plate is horizontally arranged in the box wall to support the current transformer; the current transformer and the hollow cavity of the containing cavity are provided with insulating limiters to fix the current transformer in the containing cavity. By using the three-phase integrated current transformer riser, the local overheating of the transformer riser can be effectively avoided, and the manufacturing cost of the transformer box body can be effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and more specifically, to a three-phase integrated current transformer riser. Background Technology

[0002] With the increasing national requirements for energy conservation and emission reduction, the development and application of new clean energy sources such as photovoltaic power generation and wind power generation are also increasing. Both of these power generation methods share the characteristic that each electric field consists of several small power generation units that are boosted in voltage before being fed into the main transformer. After further boosting, the voltage enters the transmission network to meet the requirements of long-distance transmission. These main transformers are all step-up transformers. Monitoring of winding temperature and other parameters requires current signals from the input side (i.e., the power supply side). Because these transformers have relatively large capacities and an input voltage level of 35kV, the input current is very large. Furthermore, the bushings for the 35kV voltage level are all rod-type structures, making the installation of current transformers quite challenging.

[0003] Bushing-type current transformers are typically cylindrical or annular geometries, and their matching riser bases are usually cylindrical to facilitate the positioning and installation of the current transformer. However, when the transformer current is large, localized overheating may occur in the transformer tank cover between the riser bases of the three phases of the transformer. This necessitates the use of antimagnetic steel plates for the transformer tank cover, significantly increasing the cost of the transformer and resulting in poor economic efficiency.

[0004] In summary, how to avoid localized overheating in transformers and reduce the manufacturing cost of transformer housings are problems that urgently need to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a three-phase integrated current transformer riser base, which can effectively avoid local overheating of the transformer and effectively reduce the manufacturing cost of the transformer housing.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A three-phase integrated current transformer riser includes: a box wall arranged in a rectangular cavity, an upper flange at the top of the box wall, a lower flange at the bottom of the box wall, a gas pipe connector on one side of the box wall, and a first cover plate for sealing the gas pipe connector. The upper flange has an opening for inserting the current transformer. The box wall is composed of a first antimagnetic steel plate, a first bent plate, a second bent plate, and a second antimagnetic steel plate connected in sequence. A partition is vertically arranged in the box wall to form a rectangular cavity for accommodating the current transformer. A support plate is horizontally arranged in the box wall to support the current transformer. An insulating limiting member is provided between the current transformer and the cavity area of ​​the rectangular cavity to fix the current transformer in the rectangular cavity.

[0008] Preferably, it further includes a box tube connector on one side of the box wall, a terminal box connected to the box tube connector, a handhole flange on the other side of the box wall, and a fourth cover plate for sealing the handhole flange. The box wall has mounting holes that mate with the handhole flange and the box tube connector.

[0009] Preferably, both the partition and the support plate are welded to the box wall, with a gap between the partition and the support plate, and the support plate has a round hole to facilitate the passage of the sleeve and lead copper busbar.

[0010] Preferably, both the upper flange and the lower flange are welded to the box wall by insertion. The upper flange has a mounting flange above it, and the mounting flange has a through hole communicating with the opening. A third cover plate is provided at the through hole. The lower flange has a second cover plate at its bottom.

[0011] Preferably, a sealing element is provided between the mounting flange and the upper flange, and the mounting flange and the upper flange are connected by bolts.

[0012] Preferably, the top of the mounting flange is provided with an oil filler plug for injecting insulating oil.

[0013] Preferably, the partition comprises a first steel plate, a third antimagnetic steel plate, and a second steel plate connected in sequence.

[0014] Preferably, lifting plates for lifting are welded on both sides of the box wall.

[0015] Preferably, the tray is provided with a lower insulating end ring, the lowest current transformer is provided on the lower insulating end ring, an insulating cardboard is provided between two or more sets of current transformers, and the uppermost current transformer is provided with an upper insulating end ring.

[0016] Preferably, the limiting member is a wooden component, which is a columnar structure with an isosceles trapezoidal or isosceles right triangle cross-section.

[0017] When using the three-phase integrated current transformer riser provided by this invention, the partition can divide the rectangular cavity of the housing wall into multiple rectangularly distributed receiving cavities, and the support plate can effectively support the current transformer. The current transformer can be placed into the receiving cavity through the opening of the upper flange, and then the insulating limiting member is placed in the cavity area between the current transformer and the receiving cavity to ensure that the current transformer is stably fixed in the receiving cavity. Furthermore, the first cover plate can be used to seal the gas pipe joint to prevent leakage from the housing wall. Therefore, the rectangular cavity of this device can accommodate and effectively fix a cylindrical annular current transformer.

[0018] Furthermore, since the first antimagnetic steel plate, the first bent plate, the second bent plate, and the second antimagnetic steel plate are connected sequentially along the contour of the box wall to form the box wall, and both the first bent plate and the second bent plate can be made of ordinary carbon steel, the first antimagnetic steel plate and the second antimagnetic steel plate can block the first bent plate and the second bent plate into a closed loop that is not connected, so that the box wall will not experience local overheating under the action of a large current. This box wall setting can effectively reduce the manufacturing cost of the device and improve the economy and reliability of the device.

[0019] In summary, the three-phase integrated current transformer riser provided by this invention can effectively prevent local overheating of the transformer and effectively reduce the manufacturing cost of the transformer housing. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0021] Figure 1 This is a front view of the three-phase integrated current transformer riser provided by the present invention.

[0022] Figure 2 This is a side view of the riser base of a three-phase integrated current transformer.

[0023] Figure 3 This is a top view of the riser base of a three-phase integrated current transformer;

[0024] Figure 4 Rear view of the riser mount for a three-phase integrated current transformer;

[0025] Figure 5 This is the front view of the box wall;

[0026] Figure 6 This is a side view of the box wall;

[0027] Figure 7 This is a top view of the box wall;

[0028] Figure 8 This is a rear view of the box wall;

[0029] Figure 9 This is the front view of the partition;

[0030] Figure 10 This is a top view of the partition;

[0031] Figure 11 This is the front view of the limiting component;

[0032] Figure 12 This is a top view of the limiting component.

[0033] Figures 1-12 middle:

[0034] 1 is the box wall, 101 is the first antimagnetic steel plate, 102 is the first bent plate, 103 is the second bent plate, 104 is the second antimagnetic steel plate, 2 is the mounting flange, 3 is the upper flange, 4 is the first cover plate, 5 is the partition plate, 501 is the first steel plate, 502 is the third antimagnetic steel plate, 503 is the second steel plate, 6 is the upper insulating end ring, 7 is the current transformer, 8 is the insulating paperboard, 9 is the lower insulating end ring, 10 is the air pipe connector, 11 is the box pipe connector, 12 is the terminal box, 13 is the support plate, 14 is the lower flange, 15 is the third cover plate, 16 is the second cover plate, 17 is the oil filling plug, 18 is the limiting component, 19 is the handhole flange, 20 is the fourth cover plate, 21 is the sealing component, and 22 is the hanging plate. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] The core of this invention is to provide a three-phase integrated current transformer riser base, which can effectively avoid local overheating of the transformer and effectively reduce the manufacturing cost of the transformer housing.

[0037] Please refer to Figures 1 to 12 .

[0038] This specific embodiment provides a three-phase integrated current transformer riser base, including: a box wall 1 with a rectangular cavity distribution, an upper flange 3 located at the top of the box wall 1, a lower flange 14 located at the bottom of the box wall 1, a gas pipe connector 10 located on one side of the box wall 1, and a first cover plate 4 for sealing the gas pipe connector 10. The upper flange 3 has an opening for inserting the current transformer 7. The box wall 1 includes a first antimagnetic steel plate 101, a first bent plate 102, a second bent plate 103, and a second antimagnetic steel plate 104 connected in sequence. A partition plate 5 is vertically arranged in the box wall 1 to form a receiving cavity for accommodating the current transformer 7. A support plate 13 is horizontally arranged in the box wall 1 to support the current transformer 7. An insulating limiting member 18 is provided in the cavity area of ​​the current transformer 7 and the receiving cavity to fix the current transformer 7 in the receiving cavity.

[0039] In practical applications, the shape, structure, size, and material of the box wall 1, upper flange 3, lower flange 14, air pipe connector 10, and first cover plate 4 can be determined according to the actual situation and needs.

[0040] When using the three-phase integrated current transformer riser provided by this invention, the partition 5 can divide the rectangular cavity of the housing wall 1 into multiple rectangularly distributed receiving cavities, and the support plate 13 can effectively support the current transformer 7. The current transformer 7 can be placed into the receiving cavity through the opening of the upper flange 3, and then the insulating limiting member 18 is placed in the cavity area between the current transformer 7 and the receiving cavity to ensure that the current transformer 7 is stably fixed in the receiving cavity. Furthermore, the first cover plate 4 can be used to seal the air pipe joint 10 to prevent leakage from the housing wall 1. Therefore, the rectangular cavity of this device can accommodate and effectively fix the cylindrical annular current transformer 7.

[0041] Furthermore, since the first antimagnetic steel plate 101, the first bent plate 102, the second bent plate 103, and the second antimagnetic steel plate 104 are connected sequentially along the contour direction of the box wall 1 to form the box wall 1, and the first bent plate 102 and the second bent plate 103 can be made of ordinary carbon steel, the first antimagnetic steel plate 101 and the second antimagnetic steel plate 104 can block the first bent plate 102 and the second bent plate 103 into a closed loop that is not connected, so that the box wall 1 will not experience local overheating under the action of a large current. This setting of the box wall 1 can effectively reduce the manufacturing cost of the device and improve the economy and reliability of the device.

[0042] In summary, the three-phase integrated current transformer riser provided by this invention can effectively prevent local overheating of the transformer and effectively reduce the manufacturing cost of the transformer housing.

[0043] Based on the above embodiments, preferably, it also includes a box pipe connector 11 disposed on one side of the box wall 1, a terminal box 12 connected to the box pipe connector 11, a handhole flange 19 disposed on the other side of the box wall 1, and a fourth cover plate 20 for sealing the handhole flange 19. The box wall 1 has mounting holes that cooperate with the handhole flange 19 and the box pipe connector 11.

[0044] Preferably, both the partition 5 and the support plate 13 are welded to the box wall 1, with a gap between the partition 5 and the support plate 13, and the support plate 13 is provided with a round hole to facilitate the passage of the sleeve and the copper busbar.

[0045] It should be noted that four partitions 5 can be welded inside the box wall 1 to form three receiving cavities, each corresponding to the three-phase bushing of the current transformer 7. The box wall 1, partitions 5, and support plate 13 are welded into a single unit, and the support plate 13 has round holes for easy passage of the bushing and lead copper busbars. A certain gap is left between the partitions 5 and the support plate 13, which facilitates the connection of the oil circulation path of the current transformer 7 and saves material usage.

[0046] Preferably, the upper flange 3 and the lower flange 14 are both welded to the box wall 1 by insertion. The upper flange 3 is provided with a mounting flange 2 above it. The mounting flange 2 is provided with a through hole communicating with the opening. A third cover plate 15 is provided at the through hole. The bottom of the lower flange 14 is provided with a second cover plate 16.

[0047] It should be noted that both the upper flange 3 and the lower flange 14 are welded to the box wall 1 by insertion. Furthermore, appropriate distances are maintained between the upper surface of the box wall 1 and the upper flange 3, and between the lower surface of the box wall 1 and the lower flange 14. This simplifies welding, ensures high reliability, and facilitates subsequent sandblasting surface treatment. The second cover plate 16 and the third cover plate 15 ensure the sealing effect of the inner cavity of the box wall 1.

[0048] Preferably, a sealing element 21 is provided between the mounting flange 2 and the upper flange 3, and the mounting flange 2 and the upper flange 3 are connected by bolts.

[0049] It should be noted that both the upper flange 3 and the lower flange 14 can be made of antimagnetic steel plate. Furthermore, a sealing groove for placing the sealing element 21 can be provided on the upper flange 3, allowing the sealing element 21 to fit snugly between the mounting flange 2 and the upper flange 3. The mounting flange 2, the sealing element 21, and the upper flange 3 are then connected as a single unit using bolts, meaning the mounting flange 2 is detachably connected to the box wall 1. This facilitates the installation of the current transformer 7 and simplifies the installation process. Additionally, the lower flange 14 of the box wall 1 can also be detachably connected to the transformer box cover to effectively reduce the transport height of the transformer.

[0050] Preferably, the top of the mounting flange 2 is provided with an oil injection plug 17 for injecting insulating oil.

[0051] It should be noted that sealing elements 21 can be installed between the first cover plate 4, the second cover plate 16, the third cover plate 15, and the fourth cover plate 20 and their corresponding connecting plates, and tightened with bolts to effectively seal the rectangular cavity of the box wall 1. During use, insulating oil can be quickly and conveniently injected into the rectangular cavity through the oil plug 17, which facilitates the oil-bearing transport of the current transformer 7, prevents the insulation performance of the entire transformer from being affected by the decrease in the insulation performance of the current transformer 7, and ultimately effectively improves the insulation reliability of the transformer.

[0052] Based on the above embodiments, preferably, the partition 5 includes a first steel plate 501, a third antimagnetic steel plate 502, and a second steel plate 503 connected in sequence. Both the first steel plate 501 and the second steel plate 503 can be made of ordinary carbon steel. Therefore, after the partition 5 is welded to the box wall 1, in the closed loop formed by the partition 5 and the box wall 1, the carbon steel loop formed by the first steel plate 501 and the second steel plate 503 can be blocked by the third antimagnetic steel plate 502, preventing local overheating under high current and effectively reducing the manufacturing cost of the partition 5.

[0053] Preferably, lifting plates 22 are welded to both sides of the box wall 1 for lifting. To facilitate subsequent operation and transportation of the device, lifting plates 22 are welded to both sides of the box wall 1 to facilitate lifting operations.

[0054] Preferably, the support plate 13 is provided with a lower insulating end ring 9, the lowest current transformer 7 is disposed on the lower insulating end ring 9, insulating paperboard 8 is disposed between two or more sets of current transformers 7, and an upper insulating end ring 6 is disposed on the upper end of the uppermost current transformer 7. Therefore, the lower insulating end ring 9 can be placed on the support plate 13, the current transformer 7 can be placed on the lower insulating end ring 9, the insulating paperboard 8 can be placed between two or more sets of current transformers 7, and the upper insulating end ring 6 can be placed on the uppermost current transformer 7 to ensure the assembly and use effect of each current transformer 7.

[0055] Preferably, the limiting member 18 is a wooden part, which is a columnar structure with an isosceles trapezoid or an isosceles right triangle cross-section.

[0056] It should be noted that the box wall 1 and the partition 5 can form a rectangular receiving cavity, in which the cylindrical annular current transformer 7 is placed. The wooden parts are placed between the current transformer 7 and the cavity area of ​​the box wall 1 and the partition 5. Furthermore, wooden parts can be placed at four corresponding positions on the outer periphery of the current transformer 7. This ensures that the positioning of the current transformer 7 is fully and reliably positioned, minimizes the amount of wood used, simplifies the processing, and makes installation and adjustment more convenient.

[0057] It should also be noted that the housing wall 1 and partition 5 of this device are made of a combination of antimagnetic steel and carbon steel, which greatly reduces the material manufacturing cost. Furthermore, the current transformer 7 is secured to the metal housing wall 1 with wooden components of isosceles trapezoidal or isosceles right-angled triangle cross-sections, reducing material consumption and simplifying operation. In addition, the device is bolted to the transformer's enclosure cover, facilitating disassembly and transportation while meeting the requirements for oil-bearing transportation of the transformer, thus improving the transformer's insulation performance.

[0058] It should be noted that the first antimagnetic steel plate 101, the second antimagnetic steel plate 104, the third antimagnetic steel plate 502, the first steel plate 501, the second steel plate 503, the first bent plate 102, the second bent plate 103, the first cover plate 4, the second cover plate 16, the third cover plate 15, and the fourth cover plate 20 mentioned in this application are only distinguished by their different positions and do not have any order of precedence.

[0059] In addition, it should be noted that the orientation or positional relationship indicated by "up and down", "top and bottom", etc. in this application is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the purpose of simplifying the description and making it easier to understand, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0060] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. Any combination of all embodiments provided by this invention is within the scope of protection of this invention and will not be elaborated upon here.

[0061] The above provides a detailed description of the three-phase integrated current transformer riser provided by this invention. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A three-phase integrated current transformer riser base, characterized in that, include: The box wall (1) is arranged in a rectangular cavity, the upper flange (3) is provided at the top of the box wall (1), the lower flange (14) is provided at the bottom of the box wall (1), the air pipe connector (10) is provided on one side of the box wall (1), and the first cover plate (4) is used to seal the air pipe connector (10). The upper flange (3) is provided with an opening for inserting the current transformer (7). The box wall (1) includes a first antimagnetic steel plate (101), a first bent plate (102), a second bent plate (103), and a second antimagnetic steel plate (104) connected in sequence. The partition plate (5) is vertically arranged in the box wall (1) to form a receiving cavity for accommodating the current transformer (7). The support plate (13) is horizontally arranged in the box wall (1) to support the current transformer (7). The cavity area of ​​the current transformer (7) and the receiving cavity is provided with an insulating limiting member (18) to fix the current transformer (7) in the receiving cavity. The partition (5) and the support plate (13) are both welded to the box wall (1). There is a gap between the partition (5) and the support plate (13). The support plate (13) is provided with a round hole to facilitate the passage of the sleeve and the copper busbar. The partition (5) includes a first steel plate (501), a third antimagnetic steel plate (502) and a second steel plate (503) connected in sequence.

2. The three-phase integrated current transformer riser according to claim 1, characterized in that, It also includes a box pipe connector (11) located on one side of the box wall (1), a terminal box (12) connected to the box pipe connector (11), a handhole flange (19) located on the other side of the box wall (1), and a fourth cover plate (20) for sealing the handhole flange (19). The box wall (1) has mounting holes that cooperate with the handhole flange (19) and the box pipe connector (11).

3. The three-phase integrated current transformer riser according to claim 1, characterized in that, The upper flange (3) and the lower flange (14) are both welded to the box wall (1) by insertion. The upper flange (3) is provided with a mounting flange (2) above it. The mounting flange (2) is provided with a through hole communicating with the opening. A third cover plate (15) is provided at the through hole. The bottom of the lower flange (14) is provided with a second cover plate (16).

4. The three-phase integrated current transformer riser according to claim 3, characterized in that, A sealing element (21) is provided between the mounting flange (2) and the upper flange (3), and the mounting flange (2) and the upper flange (3) are connected by bolts.

5. The three-phase integrated current transformer riser according to claim 4, characterized in that, The top of the mounting flange (2) is provided with an oil filler plug (17) for injecting insulating oil.

6. The three-phase integrated current transformer riser according to any one of claims 1 to 5, characterized in that, Both sides of the box wall (1) are welded with lifting plates (22) for lifting.

7. The three-phase integrated current transformer riser according to any one of claims 1 to 5, characterized in that, The tray (13) is provided with a lower insulating end ring (9), the lowest current transformer (7) is provided on the lower insulating end ring (9), and an insulating paperboard (8) is provided between two or more sets of current transformers (7). The upper end of the highest current transformer (7) is provided with an upper insulating end ring (6).

8. The three-phase integrated current transformer riser according to any one of claims 1 to 5, characterized in that, The limiting member (18) is a wooden component, which is a columnar structure with a cross-section of an isosceles trapezoid or an isosceles right triangle.

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