Oil-immersed transformer with circular stay curtain semi-oil duct structure

Abstract

The utility model relates to the field of transformers, and provides an oil-immersed transformer with a circular stay curtain semi-oil duct structure. The oil-immersed transformer comprises a plurality of iron cores, the winding comprises a high-voltage coil and a low-voltage coil, the low-voltage coil is arranged on the outer rings of the iron cores in a sleeving mode, two pieces of corrugated paper and two insulating layers are arranged on the outer ring of the low-voltage coil, the thickness of the corrugated paper is larger than that of the insulating layers, and the thickness of the insulating layers is larger than that of the corrugated paper. The two pieces of corrugated paper and the two insulating layers are sequentially and mutually connected end to end to form a closed annular structure. When in use, the two pieces of corrugated paper and the two insulating layers are arranged, the thickness of the corrugated paper is larger than that of the insulating layers, and the two pieces of corrugated paper and the two insulating layers are sequentially and mutually connected end to end to form a closed annular structure to be matched for use, so that the corrugated paper and the insulating layers can be prevented from being in close contact with a transformer winding in the use process; the circulating heat dissipation performance of cooling oil is improved, and temperature rise in the oil-immersed transformer caused by long-time use is avoided.

Description

Technical Field

[0001] The utility model relates to the field of transformers, in particular to an oil-immersed transformer with a circular stay curtain semi-oil channel structure. Background Art

[0002] A transformer is a device that uses the principle of electromagnetic induction to change AC voltage. Its main components are primary coil, secondary coil and iron core. Its main functions include voltage conversion, current conversion, impedance conversion, isolation and voltage stabilization. Transformers include distribution transformers, power transformers, fully sealed transformers, combined transformers, dry-type transformers, oil-immersed transformers, single-phase transformers, electric furnace transformers, rectifier transformers, reactors, anti-interference transformers, lightning protection transformers, box-type transformer test transformers, corner transformers, high current transformers and excitation transformers.

[0003] During the use of oil-immersed transformers, the corrugated paper and insulation layer of the semi-oil channel are in close contact with the transformer windings, which reduces the circulation and heat dissipation performance of the cooling oil. Long-term use can easily cause the internal temperature of the oil-immersed transformer to rise, thereby causing the transformer's operating stability to decrease, reducing the practicality of the oil-immersed transformer.

[0004] To this end, we propose an oil-immersed transformer with a circular stay curtain semi-oil channel structure. Utility Model Content

[0005] Technical issues solved

[0006] In view of the deficiencies in the prior art, the utility model provides an oil-immersed transformer with a circular support curtain semi-oil channel structure, which solves the technical problem that the corrugated paper and insulation layer of the semi-oil channel of the oil-immersed transformer are in close contact with the transformer winding during use, thereby reducing the cooling oil circulation and heat dissipation performance.

[0007] Technical Solution

[0008] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] An oil-immersed transformer with a circular stay curtain semi-oil channel structure, comprising:

[0010] Multiple cores;

[0011] The winding comprises a high-voltage coil and a low-voltage coil, wherein the low-voltage coil is sleeved on the outer ring of a plurality of iron cores, and the outer ring of the low-voltage coil is provided with two corrugated papers and two insulating layers, the thickness of the corrugated papers is greater than the thickness of the insulating layers, and the two corrugated papers and the two insulating layers are sequentially connected to each other first and form a closed ring structure, and the outer ring of the corrugated papers and the insulating layers is provided with a plurality of semi-oil channel stays, and the high-voltage coil is located at the outer ring of the plurality of semi-oil channel stays.

[0012] In a further embodiment, threading holes are formed on the surfaces of the plurality of semi-oil channel stays, and the semi-oil channel stays are circular.

[0013] In a further embodiment, the semi-oil channel stays are arranged in parallel and are sequentially connected to form a curtain-like structure through connecting lines, so that the windings have good insulation performance.

[0014] In a further embodiment, the semi-oil channel support bar is made of an insulating rod, and the connecting wire is an insulating wire.

[0015] In a further embodiment, an oil passage for transformer oil to flow and extending along the axial direction of the semi-oil channel strut is provided at the top of the semi-oil channel strut.

[0016] In a further embodiment, the plurality of cores are mounted on a surface of a mounting base.

[0017] Beneficial Effects

[0018] The utility model provides an oil-immersed transformer with a circular support curtain semi-oil channel structure. Compared with the prior art, it has the following beneficial effects:

[0019] 1. Through two corrugated papers and two insulating layers, the thickness of the corrugated papers is greater than the thickness of the insulating layers. The two corrugated papers and the two insulating layers are connected to each other in sequence to form a closed ring structure. During use, the corrugated papers and the insulating layers can avoid close contact with the transformer windings, improve the circulation and heat dissipation performance of the cooling oil, and avoid the internal temperature of the oil-immersed transformer caused by long-term use.

[0020] 2. A curtain-type half-oil channel is provided between the high-voltage coil and the low-voltage coil to form the main insulation. The curtain-type half-oil channel is composed of a half-oil channel support sticked on a cardboard, and the side of the half-oil channel support faces the low-voltage coil. The half-oil channel support in the structure is circular, and the half-oil channel support is arranged parallel to each other and connected in sequence by connecting wires to form a curtain-like structure, so that the transformer coil layers have good insulation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a front view structural schematic diagram of the utility model.

[0023] Figure 2 It is a schematic diagram of the top view structure of the utility model.

[0024] Figure 3 Schematic diagram of the semi-oil channel support structure of the utility model

[0025] The reference numerals in the figure are:

[0026] 1. Mounting seat; 2. Winding; 201. High-voltage coil; 202. Low-voltage coil; 3. Iron core; 4. Connecting wire; 5. Semi-oil channel support bar; 6. Corrugated paper; 7. Insulation layer; 8. Mounting seat. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model is described clearly and completely. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] The embodiment of the present application provides an oil-immersed transformer with a circular support curtain semi-oil channel structure, which solves the problem of close contact between the corrugated paper and the insulating layer of the semi-oil channel and the transformer winding during use of the oil-immersed transformer, thereby reducing the problem of circulating and heat dissipating performance of the cooling oil. When in use, two corrugated papers and two insulating layers can be used to avoid close contact between the corrugated paper and the insulating layer and the transformer winding, thereby improving the circulating and heat dissipating performance of the cooling oil and avoiding the internal temperature rise of the oil-immersed transformer caused by long-term use.

[0029] The technical solution in the embodiment of the present application is to solve the above technical problems, and the overall idea is as follows:

[0030] The two corrugated papers and the two insulating layers are connected to each other in sequence to form a closed ring structure. During use, the close contact between the corrugated papers and the insulating layers and the transformer windings can be avoided, thereby improving the circulation and heat dissipation performance of the cooling oil.

[0031] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] Reference Figure 1-Figure 3 , an oil-immersed transformer with a circular stay curtain semi-oil channel structure, comprising;

[0033] A plurality of iron cores 3;

[0034] Winding 2, winding 2 includes a high-voltage coil 201 and a low-voltage coil 202, the low-voltage coil 202 is sleeved on the outer ring of multiple iron cores 3, the outer ring of the low-voltage coil 202 is provided with two corrugated papers 6 and two insulating layers 7, the thickness of the corrugated paper 6 is greater than the thickness of the insulating layer 7, the two corrugated papers 6 and the two insulating layers 7 are connected to each other in sequence and form a closed ring structure, the outer ring of the corrugated paper 6 and the insulating layer 7 is provided with multiple semi-oil channel struts 5, and the high-voltage coil 201 is located at the outer ring of the multiple semi-oil channel struts 5.

[0035] The high-voltage coil 201 and the low-voltage coil 202 are the main components of the transformer, which are mainly responsible for the conversion of electric energy and the regulation of voltage. There are significant differences in their structures and functions. The high-voltage coil 201 usually has more turns than the low-voltage coil 202, and the wire is relatively thin. On the contrary, the low-voltage coil 202 has fewer turns, but the wire used is thicker. This design makes the high-voltage coil 201 and the low-voltage coil 202 have different resistance values. The high-voltage coil 201 has more turns and longer wires, so its resistance is larger; while the low-voltage coil 202 has fewer turns and shorter wires, so its resistance is smaller.

[0036] Threading holes 8 are formed on the surfaces of the plurality of semi-oil channel stays 5 , and the semi-oil channel stays 5 are circular.

[0037] The transverse cross section of the semi-oil gallery stay 5 is in the shape of a circular ring, so that the semi-oil gallery stay 5 has a relatively high supporting strength.

[0038] The semi-oil channel stays 5 are arranged in parallel and are sequentially connected to form a curtain-like structure through connecting wires 4, so that the windings 2 have good insulation performance.

[0039] The semi-oil channel struts 5 are arranged in parallel with each other, so that the corrugated paper is not easy to crack and the struts are regular, so that the quality of the strut curtain is also greatly improved. The improvement of the quality of the strut curtain can enhance the overall performance of the transformer.

[0040] The semi-oil channel stay 5 is made of an insulating rod, and the connecting wire 4 is an insulating wire.

[0041] The connecting wire 4 is an insulated wire, which improves the insulation effect between the windings 2 .

[0042] An oil passage for transformer oil to flow and extending along the axial direction of the semi-oil channel strut 5 is provided at the top of the semi-oil channel strut 5 .

[0043] The use of the semi-oil channel stays 5 has a supporting function and can support the semi-oil channel pipes. Moreover, the semi-oil channel stays 5 are evenly distributed, so the support for the semi-oil channel pipes is more stable.

[0044] The semi-oil channel support bar 5 plays an important role in the transformer. It is mainly used for the axial split transformer low-voltage winding 2 to wind the foil coil structure, which can improve the working efficiency and performance of the product. The semi-oil channel support bar 5 is a special insulating material, and its main function is to provide a channel for the oil cooling coil and to play an insulating role between the high-voltage coil 201 or the low-voltage coil 202.

[0045] A plurality of iron cores 3 are mounted on the surface of the mounting base 1 .

[0046] The iron core 3 is mainly composed of a body, fasteners and insulating parts. The body is a magnetic conductor made of electrical steel sheets, and the fasteners include clamps, screws, glass binding tapes, steel binding tapes and pads. The insulating parts include clamp insulation, insulating tubes and insulating pads, grounding plates and pads. The structure of the iron core 3 is usually composed of two parts: an iron column and an iron yoke. The winding 2 is put on the iron column, and the iron yoke connects the iron columns to form a closed magnetic circuit. In addition, in order to reduce eddy currents, there is a certain insulation resistance between the sheets. Since the capacitance between the sheets is very large, it can be regarded as a path in the alternating electric field. Therefore, only one point of grounding in the iron core 3 is needed to clamp the potential of the entire stack of core 3 sheets to the ground potential.

[0047] Oil-immersed transformer is a common power equipment, which is characterized by using oil as the main insulation means and relying on oil for cooling. The main components of this transformer include iron core 3, winding 2, oil tank, oil pillow, respirator, explosion-proof pipe, radiator, insulating sleeve, tap changer and gas relay, etc.

[0048] During use, by connecting two corrugated papers 6 and two insulating layers 7 in sequence to form a closed ring structure, close contact between the corrugated papers 6 and the insulating layers 7 and the transformer winding 2 can be avoided, thereby improving the circulation and heat dissipation performance of the cooling oil. The semi-oil channel support bar 5 is circular in shape, which can better support the oil channel pipe.

[0049] In summary, compared with the prior art, the present invention has the following beneficial effects:

[0050] Through two corrugated papers 6 and two insulating layers 7, the thickness of the corrugated papers 6 is greater than the thickness of the insulating layers 7, and the two corrugated papers 6 and the two insulating layers 7 are connected to each other in sequence to form a closed ring structure. During use, the corrugated papers 6 and the insulating layers 7 can avoid close contact with the transformer winding 2, thereby improving the circulation and heat dissipation performance of the cooling oil and avoiding the internal temperature of the oil-immersed transformer from rising due to long-term use.

[0051] A curtain-type half-oil channel constituting the main insulation is provided between the high-voltage coil 201 and the low-voltage coil 202. The curtain-type half-oil channel is composed of a half-oil channel support 5 adhered to cardboard, and the side of the half-oil channel support 5 faces the low-voltage coil 202. The half-oil channel support 5 in the structure is circular, and the half-oil channel support 5 is arranged parallel to the half-oil channel support 5 and is connected in sequence into a curtain-like structure through connecting wires 4, so that the coil layers of the transformer have good insulation performance.

[0052] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0053] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An oil-immersed transformer with a circular stay curtain semi-oil channel structure, characterized in that: include; A plurality of iron cores (3); A winding (2), the winding (2) comprising a high-voltage coil (201) and a low-voltage coil (202), the low-voltage coil (202) being sleeved on the outer ring of a plurality of iron cores (3), the outer ring of the low-voltage coil (202) being provided with two corrugated papers (6) and two insulating layers (7), the thickness of the corrugated papers (6) being greater than the thickness of the insulating layers (7), the two corrugated papers (6) and the two insulating layers (7) being connected to each other in sequence and forming a closed ring structure, the outer ring of the corrugated papers (6) and the insulating layers (7) being provided with a plurality of semi-oil channel stays (5), the high-voltage coil (201) being located on the outer ring of the plurality of semi-oil channel stays (5).

2. The oil-immersed transformer with a circular stay curtain semi-oil channel structure as claimed in claim 1, characterized in that: The surfaces of the plurality of semi-oil channel stays (5) are provided with threading holes (8), and the semi-oil channel stays (5) are circular.

3. The oil-immersed transformer with a circular stay curtain semi-oil channel structure as claimed in claim 1, characterized in that: The semi-oil channel stays (5) are arranged in parallel and are sequentially connected to form a curtain-like structure through connecting wires (4), so that the windings (2) have good insulation performance.

4. The oil-immersed transformer with a circular stay curtain semi-oil channel structure as claimed in claim 3, characterized in that: The semi-oil channel support bar (5) is made of an insulating rod, and the connecting wire (4) is an insulating wire.

5. The oil-immersed transformer with a circular stay curtain semi-oil channel structure as claimed in claim 1, characterized in that: An oil passage through which transformer oil flows and which extends along the axial direction of the semi-oil channel support (5) is provided at the top of the semi-oil channel support (5).

6. The oil-immersed transformer with a circular stay curtain semi-oil channel structure as claimed in claim 1, characterized in that: The plurality of iron cores (3) are mounted on the surface of the mounting seat (1).

Images