Transformer core with novel core oil duct

Abstract

This utility model provides a transformer core composed of multiple layers of silicon steel sheets stacked in stages, an upper clamp, and a lower clamp. The silicon steel sheets include a core column and an upper yoke and a lower yoke respectively connected to the upper and lower ends of the core column to form a closed magnetic circuit. The stacking direction of the silicon steel sheets is consistent with the direction of the magnetic circuit, and the joint between the core column and the upper and lower yokes adopts a slanted joint. Several insulating paperboards are bonded between adjacent layers of silicon steel sheets. The insulating paperboards are obliquely bonded to the silicon steel sheets to form a tortuous oil guiding path, so that the transformer oil can flow quickly and dissipate the heat generated by the core during transformer operation in a timely manner through the transformer oil, thereby reducing the temperature rise of hot spots in the core and ensuring the safe operation of the transformer.

Description

Technical Field

[0001] This utility model relates to the field of transformer equipment technology, and more specifically, to a transformer core with a novel core oil channel. Background Technology

[0002] Currently, the core oil channels of 110-500kV power transformers are manufactured by directly bonding insulating paperboard to silicon steel sheets, allowing transformer oil to flow directly between the insulating paperboards. Figure 3 The core oil channel is typically placed at the point of highest temperature in the transformer core. Its main function is to provide an oil passage and reduce the temperature rise of these hot spots. This type of oil channel lengthens the oil circulation path. Due to the viscosity of transformer oil, the flow rate slows down. If the oil channel cannot ensure rapid oil flow to carry away the heat generated during transformer core operation, the temperature of the hot spots can rise sharply, damaging the phosphate insulation of the silicon steel sheets. This increases eddy current losses between the steel sheets, further raising the hot spot temperature and potentially causing transformer core damage, thus affecting the safe operation of the transformer. Utility Model Content

[0003] To overcome the shortcomings of existing technologies, this utility model provides a transformer core with a novel core oil channel.

[0004] This utility model is achieved through the following technical solution: a transformer core with a novel core oil channel, comprising a transformer core formed by stacking multiple layers of silicon steel sheets, an upper clamp, and a lower clamp. The silicon steel sheets include a core column and an upper yoke and a lower yoke respectively connected to the upper and lower ends of the core column to form a closed magnetic circuit. The stacking direction of the silicon steel sheets is consistent with the direction of the magnetic circuit, and the joint between the core column and the upper and lower yokes adopts a slanted joint. Several insulating paperboards are bonded between adjacent layers of silicon steel sheets. The upper clamp and the lower clamp are respectively set on the outside of the upper and lower yokes and are fixed by fasteners. The bonding direction of the insulating paperboards is as follows: the insulating paperboards in the upper yoke area are bonded at a 30° angle to the right; the insulating paperboards in the lower yoke area are bonded at a 30° angle to the left; and the upper half of the insulating paperboards in the core column area is bonded at a 30° angle to the left and the lower half is bonded at a 30° angle to the right.

[0005] As a preferred option, the insulating paperboard is 0.5-2mm thick and coated with an oil-resistant adhesive. After being bonded to the silicon steel sheet, it forms an iron core oil channel with a width of 3-10mm.

[0006] As a preferred embodiment, the fastener includes an upper bolt and a lower bolt, with the upper bolt passing through the upper clamp and the lower bolt passing through the lower clamp, both of which are locked in place by nuts.

[0007] Furthermore, the upper and lower bolts are insulated screws, and their surfaces are covered with an epoxy resin layer.

[0008] As a preferred option, the transformer core is used in 110-500kV power transformers.

[0009] This utility model, by adopting the above technical solution, has the following beneficial effects compared with the prior art: the insulating paperboard is obliquely glued to the silicon steel sheet to form a tortuous oil guiding path, which allows the transformer oil to flow quickly and dissipates the heat generated by the iron core during transformer operation in a timely manner through the transformer oil, thereby reducing the temperature rise of the hot spot in the iron core and ensuring the safe operation of the transformer.

[0010] Additional aspects and advantages of this invention will become apparent in the description that follows, or may be learned by practice of this invention. Attached Figure Description

[0011] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of a structure for bonding insulating paperboard onto a silicon steel sheet. Figure 3 This is a schematic diagram of the structure of bonding insulating paperboard onto silicon steel sheets in the prior art. in, Figures 1 to 2 The correspondence between the reference numerals and components in the attached drawings is as follows: 1 Transformer core, 2 Silicon steel sheet, 3 Core column, 4 Upper yoke, 5 Lower yoke, 6 Upper clamp, 7 Lower clamp, 8 Insulating cardboard, 9 Core oil passage, 10 Upper bolt, 11 Lower bolt; Figure 2 and Figure 3 The middle arrow points in the direction of oil flow. Detailed Implementation

[0012] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0013] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0014] The following is combined Figures 1 to 3The present invention will specifically describe the transformer core with novel core oil channels according to an embodiment of the present invention.

[0015] like Figure 1 As shown, this utility model proposes a transformer core with a novel core oil channel, comprising a transformer core 1 formed by stacking multiple layers of silicon steel sheets 2, an upper clamp 6, and a lower clamp 7. Each silicon steel sheet 2 includes a core column 3 and an upper yoke 4 and a lower yoke 5 connected to the upper and lower ends of the core column 3 to form a closed magnetic circuit. The stacking direction of the silicon steel sheets 2 is consistent with the direction of the magnetic circuit, and the joint between the core column 3 and the upper and lower yokes 4 and 5 is an oblique joint. Several insulating cardboard sheets 8 are bonded between adjacent layers of silicon steel sheets 2. The upper clamp 6 and lower clamp 7 are respectively located on the outside of the upper yoke 4 and lower yoke 5, and are fixed by fasteners, including an upper bolt 10 and a lower bolt 11. The upper bolt 10 passes through the upper clamp 6, and the lower bolt 11 passes through the lower clamp 7, and both are locked by nuts 12. The upper bolt 10 and lower bolt 11 are insulating screws, and their surfaces are covered with an epoxy resin layer. Among them, such as Figure 2 As shown, the bonding direction of the insulating paperboard 8 is as follows: the insulating paperboard 8 in the upper yoke 4 area is bonded at a 30° angle to the right; the insulating paperboard 8 in the lower yoke 5 area is bonded at a 30° angle to the left; the upper half of the insulating paperboard 8 in the core column 3 area is bonded at a 30° angle to the left and the lower half at a 30° angle to the right. By bonding the insulating paperboard to the silicon steel sheet at an angle, a tortuous oil-conducting path is formed, allowing the transformer oil to flow quickly and dissipating the heat generated by the core during transformer operation. This reduces the temperature rise of hot spots in the core, thus ensuring the safe operation of the transformer. The structure is simple, easy to operate, and safe and reliable. The insulating paperboard is 0.5-2mm thick and coated with an oil-resistant adhesive. After bonding with the silicon steel sheet 2, it forms a core oil channel 9 with a width of 3-10mm.

[0016] The new type of core oil channel is made by tilting and sticking insulating paperboard onto silicon steel sheets to form a tortuous oil guiding path, which allows the transformer oil to flow quickly and dissipate the heat generated by the core during transformer operation in a timely manner, thereby reducing the temperature rise of hot spots in the core and ensuring the safe operation of the transformer. This design is mainly applied to 110-500kV power transformers.

[0017] In the description of this utility model, the term "multiple" refers to two or more. Unless otherwise explicitly defined, the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not 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 this utility model. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0018] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0019] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A transformer core with a novel core oil channel, comprising a transformer core (1) formed by stacking multiple layers of silicon steel sheets (2) in stages, an upper clamp (6) and a lower clamp (7), wherein the silicon steel sheets (2) include a core column (3) and an upper yoke (4) and a lower yoke (5) respectively connected to the upper and lower ends of the core column (3) to form a closed magnetic circuit, the stacking direction of the silicon steel sheets (2) is consistent with the direction of the magnetic circuit, and the joint between the core column (3) and the upper yoke (4) and the lower yoke (5) is joined by a slanted joint, and several insulating paperboards (8) are bonded between adjacent layers of silicon steel sheets (2), the upper clamp (6) and the lower clamp (7) are respectively disposed on the outside of the upper yoke (4) and the lower yoke (5), and the upper clamp (6) and the lower clamp (7) are respectively fixed by fasteners, characterized in that, The bonding direction of the insulating paperboard (8) is as follows: the insulating paperboard (8) in the upper yoke (4) area is bonded at a 30° angle to the right; the insulating paperboard (8) in the lower yoke (5) area is bonded at a 30° angle to the left; the upper half of the insulating paperboard (8) in the core column (3) area is bonded at a 30° angle to the left and the lower half is bonded at a 30° angle to the right.

2. A transformer core with a novel core oil channel according to claim 1, characterized in that... The insulating paperboard has a thickness of 0.5-2mm and is coated with an oil-resistant adhesive. After being bonded to the silicon steel sheet (2), it forms an iron core oil channel (9) with a width of 3-10mm.

3. A transformer core with a novel core oil channel according to claim 1, characterized in that... The fasteners include an upper bolt (10) and a lower bolt (11). The upper bolt (10) passes through the upper clamp (6), and the lower bolt (11) passes through the lower clamp (7), and both are locked and fixed by nuts (12).

4. A transformer core with a novel core oil channel according to claim 3, characterized in that, The upper bolt (10) and lower bolt (11) are insulated screws with an epoxy resin layer covering their surfaces.

5. A transformer core with a novel core oil channel according to claim 1, characterized in that... The transformer core (1) is used for 110-500kV power transformers.

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