A transformer

Abstract

The embodiment of the present application discloses a kind of transformers, comprising: oil tank;Body, it is set in oil tank, and body includes core and winding, core includes main column core and side column core, main column core and side column core are arranged side by side, winding includes first winding and second winding, first winding is sleeved on the outside of main column core, second winding is sleeved on the outside of side column core, and first winding and second winding are electrically connected by lead wire.The transformer provided by the present application reduces the length of the transformer by the structural design of single main column and side column, saves the occupied space, reduces the transportation cost, and reduces the assembly workload of body, simplifies the internal structure, improves the production efficiency of transformer, and reduces the risk point in production due to the setting of one main column, improves safety and reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer equipment, and more particularly, to a transformer. Background Art

[0002] With the rapid development of China's power industry, the construction of high-voltage, large-capacity power stations has increased annually. Existing 750kV power station main transformers are all double-pole autotransformers. These transformers are complex in structure and difficult to design for insulation, resulting in low production efficiency. Furthermore, the transformers are large and heavy to transport, resulting in high transportation costs. Furthermore, the installation requires a large floor space, making them unable to meet current market requirements.

[0003] Therefore, how to improve the production efficiency of transformers and reduce transportation costs has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide a transformer to improve the production efficiency of the transformer and reduce transportation costs.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A transformer, comprising:

[0007] tank;

[0008] The device body is arranged in the oil tank, and the device body includes an iron core and a winding, the iron core includes a main column iron core and a side column iron core, the main column iron core and the side column iron core are arranged side by side, and the winding includes a first winding and a second winding, the first winding is sleeved on the outside of the main column iron core, the second winding is sleeved on the outside of the side column iron core, and the first winding and the second winding are electrically connected through a lead.

[0009] Optionally, in the above transformer, clamp webs are provided on both sides of the iron core, and non-magnetic steel plates are provided on the clamp webs.

[0010] Optionally, in the above transformer, the height of the iron core is h, and 4.2m≤h≤4.6m.

[0011] Optionally, in the above transformer, the diameter of the winding is d, and 2.4m≤d≤2.6m.

[0012] Optionally, in the above-mentioned transformer, the first winding includes a low-voltage winding, a medium-voltage winding and a high-voltage winding, and the low-voltage winding, the medium-voltage winding and the high-voltage winding are sequentially sleeved on the outside of the main column iron core from the inside to the outside; the second winding includes an excitation winding and a voltage regulating winding, and the excitation winding and the voltage regulating winding are sequentially sleeved on the outside of the side column iron core from the inside to the outside.

[0013] Optionally, in the above-mentioned transformer, the first end of the excitation winding is electrically connected to the first end of the low-voltage winding through a lead, and the second end of the excitation winding is electrically connected to the second end of the low-voltage winding through a lead; the first end of the voltage regulating winding is electrically connected to the first end of the high-voltage winding through a lead, and the second end of the voltage regulating winding is electrically connected to the first end of the medium-voltage winding through a lead.

[0014] Optionally, in the above-mentioned transformer, a bushing is provided on the outside of the oil tank, and the bushing includes a low-voltage bushing, a neutral point bushing, a medium-voltage bushing and a high-voltage bushing; the low-voltage bushing includes a first low-voltage bushing and a second low-voltage bushing, the lead of the first end of the low-voltage winding is led into the first low-voltage bushing, and the lead of the second end of the low-voltage winding is led into the second low-voltage bushing; the lead of the first end of the medium-voltage winding is led into the medium-voltage bushing through a voltage equalizing tube, and an off-excitation tap changer is connected between the first end of the medium-voltage winding and the medium-voltage bushing, and the lead of the second end of the medium-voltage winding is led into the neutral point bushing; the lead of the first end of the high-voltage winding is led into the high-voltage bushing through a lead-out device, and the lead of the second end of the high-voltage winding is led to the off-excitation tap changer.

[0015] Optionally, in the above transformer, an oil conservator and a cooler are provided on the outside of the oil tank, and the oil conservator and the cooler are respectively located on the long axis side of the oil tank.

[0016] Optionally, in the above transformer, the cooler adopts an OFAF cooling method.

[0017] Optionally, in the above transformer, the oil tank is provided with electric shielding and magnetic shielding; and / or,

[0018] The ends of the windings are provided with magnetic shunts.

[0019] The transformer provided by the present invention is constructed by placing a transformer body within an oil tank, wherein the transformer body comprises an iron core and windings. Specifically, the iron core comprises a main leg core and a side leg core. A first winding is sleeved onto the outer side of the single main leg core to form a single main leg, and a second winding is sleeved onto the outer side of the side leg core to form a side leg. The first and second windings are electrically connected via leads, so that the main leg supplies power to the side legs. This single main leg and side leg design reduces the transformer's length, simplifies the internal structure, reduces the transformer body assembly workload, and saves space.

[0020] Compared with the double-column transformer in the prior art, the transformer provided by the present invention reduces the length of the transformer, saves occupied space, reduces transportation costs, and reduces the assembly workload of the device body, simplifies the internal structure, and improves the production efficiency of the transformer. At the same time, due to the provision of a main column, the risk points in production are reduced, and safety and reliability are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0022] Figure 1 A schematic structural diagram of a transformer provided in an embodiment of the present invention;

[0023] Figure 2 A schematic structural diagram of a device body provided in an embodiment of the present invention;

[0024] Figure 3 A schematic diagram of transformer wiring provided by an embodiment of the present invention;

[0025] Figure 4 A schematic structural diagram of a clamp web provided in an embodiment of the present invention.

[0026] Among them, 1 is the oil tank, 11 is the iron core, 111 is the main column iron core, 112 is the side column iron core, 12 is the winding, 121 is the first winding, 1211 is the low-voltage winding, 1212 is the medium-voltage winding, 1213 is the high-voltage winding, 122 is the second winding, 1221 is the excitation winding, 1222 is the voltage regulating winding, 13 is the clamp web, 131 is the non-magnetic steel plate, 2 is the low-voltage bushing, 21 is the neutral point bushing, 22 is the medium-voltage bushing, 23 is the high-voltage bushing, 3 is the oil conservator, and 4 is the cooler. DETAILED DESCRIPTION

[0027] The core of the present invention is to provide a transformer to improve the production efficiency of the transformer and reduce transportation costs.

[0028] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] like Figure 1 and Figure 2 As shown, an embodiment of the present invention discloses a transformer, including an oil tank 1 and a body. It should be noted that with the rapid development of the country's electric power industry, the construction of high-voltage and large-capacity power stations has increased year by year. In the prior art, the main transformers of 750kV power stations are all autotransformers with double main poles. The structure of this type of transformer is relatively complex, and the insulation design is difficult, resulting in low production efficiency. At the same time, the transformer has a large transportation size and a heavy transportation weight, which makes the transportation cost high. After installation, it occupies a large area and cannot meet the current market requirements. The transformer disclosed in the embodiment of the present invention reduces the length of the transformer, saves space, reduces transportation costs, and reduces the assembly workload of the body through the structural design of a single main pole and a side pole. It simplifies the internal structure and improves the production efficiency of the transformer. At the same time, due to the provision of a main pole, the risk points in production are reduced and safety and reliability are improved.

[0030] Among them, such as Figure 1 and Figure 2 As shown, the device body is arranged in the oil tank 1. Figure 2 As shown, the transformer body includes an iron core 11 and windings 12. Iron core 11 comprises a main leg core 111 and a side leg core 112, which are arranged side by side. Windings 12 comprise a first winding 121 and a second winding 122. First winding 121 is sleeved onto the outside of main leg core 111 to form a single main leg, while second winding 122 is sleeved onto the outside of side leg core 112 to form a side leg. First winding 121 and second winding 122 are electrically connected via leads, allowing the main leg to supply power to the side legs. Compared to conventional dual-leg transformers, the single main leg and side leg design reduces the transformer's length by approximately 10% and its width by approximately 30%, saving space. The transformer's weight is reduced by 12% and its shipping weight by 10%, reducing shipping costs. The simplified internal structure reduces the transformer body assembly workload by approximately 50%, improving transformer production efficiency. At the same time, the setting of a main column reduces the risk points in production and improves safety and reliability.

[0031] like Figure 2 and Figure 3 As shown, in a specific embodiment, the first winding 121 includes a low-voltage winding 1211, a medium-voltage winding 1212, and a high-voltage winding 1213, and the low-voltage winding 1211, the medium-voltage winding 1212, and the high-voltage winding 1213 are sequentially sleeved on the outside of the main leg core 111 from the inside out. The second winding 122 includes an excitation winding 1221 and a voltage regulating winding 1222, and the excitation winding 1221 and the voltage regulating winding 1222 are sequentially sleeved on the outside of the side leg core 112 from the inside out. The first end of the excitation winding 1221 is electrically connected to the first end of the low-voltage winding 1211 via a lead wire, and the second end of the excitation winding 1221 is electrically connected to the second end of the low-voltage winding 1211 via a lead wire. The first end of the voltage regulating winding 1222 is electrically connected to the first end of the high-voltage winding 1213 via a lead wire, and the second end of the voltage regulating winding 1222 is electrically connected to the first end of the medium-voltage winding 1212 via a lead wire. By sequentially attaching the low-voltage winding 1211, the medium-voltage winding 1212, and the high-voltage winding 1213 to the outside of the main leg core 111 from the inside out, and sequentially attaching the excitation winding 1221 and the voltage regulating winding 1222 to the outside of the side leg core 112 from the inside out, the problem of complex insulation design structure of the voltage regulating winding 1222 in a single-main leg transformer is solved, the internal structure of the transformer is simplified, and the production efficiency of the transformer is improved.

[0032] Furthermore, a bushing is provided on the outside of the fuel tank 1, comprising a low-voltage bushing 2, a neutral point bushing 21, a medium-voltage bushing 22, and a high-voltage bushing 23. Two low-voltage bushings 2 are provided. For ease of understanding, the two low-voltage bushings 2 are defined as a first low-voltage bushing and a second low-voltage bushing, respectively. The lead wire of the first end of the low-voltage winding 1211 is led into the first low-voltage bushing, and the lead wire of the second end of the low-voltage winding 1211 is led into the second low-voltage bushing. The lead wire of the first end of the medium-voltage winding 1212 is led into the medium-voltage bushing 22 via a voltage-equalizing tube. A de-energized tap changer is connected between the first end of the medium-voltage winding 1212 and the medium-voltage bushing 22. The lead wire of the second end of the medium-voltage winding 1212 is led into the neutral point bushing 21. The lead wire at the first end of the high-voltage winding 1213 is routed through a lead-out device into the high-voltage bushing 23, while the lead wire at the second end of the high-voltage winding 1213 is routed to the off-circuit tap changer. To achieve self-coupling of the transformer, the first end of the medium-voltage winding 1212 and the second end of the high-voltage winding 1213 are electrically connected via a lead wire. The provision of a bushing and routing the lead wire inside it insulates the lead wire from the transformer housing while also securing the lead wire.

[0033] The transformer provided by the present invention comprises a transformer body disposed within an oil tank 1, wherein the transformer body comprises an iron core 11 and windings 12. Specifically, the iron core 11 includes a main leg core 111 and a side leg core 112. A first winding 121 is sleeved onto the outer side of the single main leg core 111 to form a single main leg, and a second winding 122 is sleeved onto the outer side of the side leg core 112 to form a side leg. The first winding 121 and the second winding 122 are electrically connected via leads, so that the main leg supplies power to the side legs. This single main leg and side leg design reduces the transformer's length, simplifies its internal structure, reduces the workload for assembly of the transformer body, and saves space.

[0034] Compared with the double-column transformer in the prior art, the transformer provided by the present invention reduces the length of the transformer, saves occupied space, reduces transportation costs, and reduces the assembly workload of the device body, simplifies the internal structure, and improves the production efficiency of the transformer. At the same time, due to the provision of a main column, the risk points in production are reduced, and safety and reliability are improved.

[0035] Since the transformer adopts a single main pole and side pole structural design, the capacity of the single main pole transformer is increased by about 100%. Relevant technical personnel in this field can understand that as the capacity of the transformer increases, the current also increases. The increase in current will lead to an increase in leakage flux, thereby causing the temperature of the winding 12 and structural parts to rise. When the leakage flux is large, it will cause stray losses in the winding 12 and structural parts.

[0036] In order to avoid the increase of magnetic leakage which may cause the temperature of the winding 12 and the core 11 and other structural parts to rise, Figure 4 As shown, in a specific embodiment, a clamping web 13 is provided on both sides of the iron core 11, and a non-magnetic steel plate 131 is provided on the clamping web 13. Specifically, a clamping web 13 is provided on both sides of the first end of the iron core 11 and on both sides of the second end of the iron core 11, and a non-magnetic steel plate 131 is provided at the center of the clamping web 13. That is, the material of the clamping web 13 at the center of the main magnetic flux leakage channel is non-magnetic steel, so that no magnetic field is generated by the clamping web 13 at the center of the main magnetic flux leakage channel, resulting in no current generation, and thus no heat generation, thereby preventing the temperature of the clamping web 13 from rising.

[0037] Furthermore, according to the magnetic flux leakage formula It can be seen that in order to reduce magnetic leakage, the height of the winding reactance needs to be increased. However, according to road transportation restrictions, within the transportation range of 200 to 250 tons, the road transportation height limit is 4.85m and the width limit is 4m. Under the condition of meeting the transportation height limit, the core height is increased as much as possible to increase the winding reactance height, and the total magnetic flux is ensured to remain unchanged by reducing the diameter of the winding 12. Specifically, the height of the core 11 is h, 4.2m≤h≤4.6m, and the diameter of the winding 12 is d, 2.4m≤d≤2.6m. In this embodiment, in order to increase the height of the core as much as possible, the height of the core 11 is 4.6m. Under this height of the core 11, the transportation height is 4.844m, which meets the transportation height requirement. At the same time, the diameter of the winding 12 is 2.6m. Under this diameter outer limit, the transportation width is 3.95m, which meets the transportation width requirement. Thus, under the condition of meeting the transportation restrictions, the winding reactance height is increased, the leakage flux density is reduced, and the stray loss of the structural parts caused by large leakage flux is reduced. It should be noted that in the leakage flux formula, B m is the maximum longitudinal leakage flux density, IW is the ampere-turn of the winding, ρ is the Rockwell coefficient, H K is the average reactance height of the winding. Increasing the reactance height of the winding means increasing H K value.

[0038] To reduce stray losses in the winding 12 and structural components caused by high magnetic flux leakage, electrical and magnetic shielding are installed inside the fuel tank 1. And / or, magnetic shunts are provided at the ends of the winding 12. Specifically, the magnetic shielding utilizes a magnetically conductive material, such as silicon steel sheets, and the electrical shielding utilizes a magnetically isolating material, such as copper plates, to reduce stray losses in the winding 12 and structural components. By providing magnetic shunts at the ends of the winding 12, the loss distribution of the core clamps is improved, and the temperature rise of hot spots in the metal structural components is reduced, thereby further preventing the phenomenon of structural component temperature increases due to increased magnetic flux leakage.

[0039] Furthermore, if Figure 1 As shown, in one specific embodiment, an oil conservator 3 and a cooler 4 are provided on the outside of the oil tank 1, and the oil conservator 3 and cooler 4 are respectively located on the long axis side of the oil tank 1. This makes transformer assembly more convenient and quick, reduces the size of the transformer, and thus reduces the transformer's occupied space. Cooler 4 uses OFAF (Oil Forced Air Forced) cooling. When the temperature is low, the transformer is cooled by oil immersion and self-cooling. When the temperature is high, the fan is activated, and the cooling method is oil immersion and air cooling. When the temperature continues to rise and reaches the upper limit, forced oil circulation and air cooling are activated to dissipate heat from the transformer.

[0040] The terms "first," "second," and the like in the specification, claims, and accompanying drawings of the present invention are used to distinguish between different items, not to describe a specific order. Furthermore, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements and may include steps or elements that are not listed.

[0041] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A transformer, characterized in that: include: Fuel tank (1); A device body is arranged in the oil tank (1), and the device body includes an iron core (11) and a winding (12), the iron core (11) includes a main column iron core (111) and a side column iron core (112), the main column iron core (111) and the side column iron core (112) are arranged side by side, and the main column iron core (111) is one, the winding (12) includes a first winding (121) and a second winding (122), the first winding (121) is sleeved on the outside of the main column iron core (111), the second winding (122) is sleeved on the outside of the side column iron core (112), and the first winding (121) and the second winding (122) are electrically connected through a lead wire; Clamp webs (13) are provided on both sides of the iron core (11), and non-magnetic steel plates (131) are provided on the clamp webs (13); The first winding (121) comprises a low-voltage winding (1211), a medium-voltage winding (1212) and a high-voltage winding (1213), and the low-voltage winding (1211), the medium-voltage winding (1212) and the high-voltage winding (1213) are sequentially sleeved on the outside of the main column iron core (111) from the inside to the outside; the second winding (122) comprises an excitation winding (1221) and a voltage-regulating winding (1222), and the excitation winding (1221) and the voltage-regulating winding (1222) are sequentially sleeved on the outside of the side column iron core (112) from the inside to the outside; The first end of the excitation winding (1221) is electrically connected to the first end of the low-voltage winding (1211) via a lead, and the second end of the excitation winding (1221) is electrically connected to the second end of the low-voltage winding (1211) via a lead; the first end of the voltage regulating winding (1222) is electrically connected to the first end of the high-voltage winding (1213) via a lead, and the second end of the voltage regulating winding (1222) is electrically connected to the first end of the medium-voltage winding (1212) via a lead; The height of the iron core (11) is h, and 4.2m≤h≤4.6m; The diameter of the winding (12) is d, and 2.4m≤d≤2.6m; The oil tank (1) is provided with an electric shield and a magnetic shield inside, and / or a magnetic shunt is provided at the end of the winding (12); A bushing is provided on the outside of the oil tank (1), and the bushing includes a low-voltage bushing (2), a neutral point bushing (21), a medium-voltage bushing (22), and a high-voltage bushing (23); the low-voltage bushing (2) includes a first low-voltage bushing and a second low-voltage bushing, the lead wire of the first end of the low-voltage winding (1211) is led into the first low-voltage bushing, and the lead wire of the second end of the low-voltage winding (1211) is led into the second low-voltage bushing; the lead wire of the first end of the medium-voltage winding (1212) is led into the second low-voltage bushing. The lead wire of the first end of the high-voltage winding (1213) is led into the high-voltage bushing (23) through a lead-out device, and the lead wire of the second end of the high-voltage winding (1213) is led into the high-voltage bushing (23) through a lead-out device, and the lead wire of the second end of the high-voltage winding (1213) is led into the high-voltage bushing (23).

2. The transformer according to claim 1, characterized in that An oil conservator (3) and a cooler (4) are provided on the outside of the oil tank (1), and the oil conservator (3) and the cooler (4) are respectively located on the long axis side of the oil tank (1).

3. The transformer according to claim 2, characterized in that The cooler (4) adopts an OFAF cooling method.

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