CN113140393A

CN113140393A - Oil-immersed transformer based on magnetic absorption type damping sound insulation plate

Info

Publication number: CN113140393A
Application number: CN202110348574.8A
Authority: CN
Inventors: 陈炜; 胡胜; 卢铃; 曹浩; 陈非; 谢银娥; 唐奇; 车垚
Original assignee: State Grid Corp of China SGCC; Electric Power Research Institute of State Grid Hunan Electric Power Co Ltd; State Grid Hunan Electric Power Co Ltd
Current assignee: State Grid Corp of China SGCC; Electric Power Research Institute of State Grid Hunan Electric Power Co Ltd; State Grid Hunan Electric Power Co Ltd
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2021-07-20

Abstract

The invention discloses an oil-immersed transformer based on magnetic absorption type damping sound insulation plates, which comprises an oil tank shell, wherein the oil tank shell comprises a top surface, a bottom surface and a plurality of side surfaces connected between the top surface and the bottom surface, and at least one side surface is provided with a damping sound insulation plate and is adsorbed and fixed through a magnetic component. The invention has the advantages of compact structure, low cost, contribution to reducing the noise of the transformer body and the like.

Description

Oil-immersed transformer based on magnetic absorption type damping sound insulation plate

Technical Field

The invention relates to the technical field of power equipment, in particular to an oil-immersed transformer based on a magnetic absorption type damping sound insulation plate.

Background

The power transformer is an important link of a power transmission and distribution network of a power system, and is mainly used for converting the voltage of a power grid so as to realize electric energy transmission. With the continuous increase of the scale of the power grid and the shortage of urban land resources, more and more transformer stations go deep into the urban center. Due to a series of reasons of uneven manufacturing process, ageing of equipment, long-term operation, close distance with a sensitive point and the like, the problem of noise pollution of the power transformer is increasingly prominent, and the research on the transformer noise control technology has important significance for power grid development.

The transformer noise originates from the transformer body and the cooling system, wherein the body noise originates from (1) vibrations caused by iron core magnetostriction and winding electrodynamic force; (2) the electromagnetic attraction force generated by magnetic leakage exists between the joints of the silicon steel sheets and the laminated sheets to cause the vibration of the iron core; (3) when a load current passes through the winding, leakage flux generated by the load current causes vibration of the coil and the oil tank wall. The body noise is transmitted to the tank and the accessories through the core foot and the transformer oil. The noise of the cooling system is mainly derived from the vibration of the fan and the oil pump.

Research shows that the noise of the transformer body is composed of noise with two times of power supply frequency as base frequency and low-frequency noise with frequency as integral multiple of fundamental frequency, and the frequency spectrum of the noise is mainly concentrated on 50Hz and frequency multiplication components thereof within 700Hz range. The noise control of the transformer is mainly divided into two modes of noise source control and propagation path control. The former adopts modes of improving the material and structure of the transformer body and the like, can directly reduce the noise level of the transformer from the source, has the most obvious noise reduction effect, but has higher technical difficulty and cost. The latter reduces the transformer noise by applying a sound insulating/absorbing (vibrating) material to absorb the energy of the vibrating sound signal during the noise (vibration) transmission process, has a certain noise reduction effect and is relatively low in cost, but the noise reduction effect on the low-frequency signal still needs to be improved.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides the oil-immersed transformer which is compact in structure, low in cost and beneficial to reducing the noise of a transformer body.

In order to solve the technical problems, the invention adopts the following technical scheme:

the utility model provides an oil-immersed transformer based on formula damping sound-proof board is inhaled to magnetism, includes the oil tank casing, the oil tank casing includes top surface, bottom surface and connects a plurality of sides between top surface and bottom surface, at least one be equipped with the damping sound-proof board on the side and adsorb fixedly through magnetic part. The magnetic member may be, for example, a strong magnet, and the damping sound insulating plate may be fixed to the side surface of the tank case by suction.

As a further improvement of the above technical solution: the damping sound insulation board comprises a flexible sound insulation layer and shaping layers clamped on two sides of the flexible sound insulation layer. The flexible sound insulation layer is used for sound insulation, the shaping layer is mainly used for fixing the flexible sound insulation layer, and meanwhile, the three-interlayer structure is beneficial to improving the sound insulation quantity of the damping sound insulation plate.

As a further improvement of the above technical solution: the flexible sound insulation layer is a modified rubber layer, and the sound insulation quantity is not lower than 20 dB. The flexible sound insulation layer adopts the modified rubber layer, so that the sound insulation quantity is high, the weight is light, and the overall weight of the transformer is not increased too much.

As a further improvement of the above technical solution: the shaping layer is an aluminum layer. The shaping layer adopts the aluminium lamination, can fix flexible sound insulation layer effectively, and self quality is light, avoids increasing the whole weight of transformer excessively.

As a further improvement of the above technical solution: two adjacent damping sound insulation boards on the same side are in lap joint, and the joint of the flexible sound insulation layer and the joint of the shaping layer are staggered. The lap joint mode can greatly reduce the sound leakage between two adjacent damping sound insulation boards and basically realize seamless connection.

As a further improvement of the above technical solution: the thickness on flexible sound insulation layer is 10mm, the thickness on design layer is 1 mm.

As a further improvement of the above technical solution: the thickness of the damping sound insulation plate is 10 mm-30 mm, the height of the damping sound insulation plate is 50 mm-200 mm larger than that of the oil tank shell, and the width of the damping sound insulation plate is less than or equal to 1.5 m. The thickness of the damping sound insulation plate is 10 mm-30 mm, the height of the damping sound insulation plate is 50 mm-200 mm larger than that of the oil tank shell, the sound insulation effect of the damping sound insulation plate is guaranteed, and meanwhile the area of the single damping sound insulation plate is beneficial to avoiding the resonance frequency of the oil tank shell.

Compared with the prior art, the invention has the advantages that: the invention discloses an oil immersed transformer based on magnetic absorption type damping sound insulation boards, which directly installs the damping sound insulation boards on each side surface of an oil tank shell for noise reduction, compared with the traditional transformer body noise reduction technology, the invention does not relate to the change of the internal structure of the transformer, does not influence the safe operation, does not increase the design cost and the manufacturing cost of the transformer, is easy to install and maintain by a magnetic adsorption fixing mode, can be simultaneously suitable for a newly put-in-service transformer and a put-in-service transformer, compared with the traditional noise reduction technology of setting a sound barrier and the like for cutting off a propagation path, the invention does not need to additionally occupy equipment fields, has compact structure and lower cost, and the damping sound insulation board is close to the sound source body, so that the noise can be effectively reduced, and the heat dissipation of the transformer is not influenced (the radiating fins are usually connected with the transformer body part through oil pipes). The invention relates to a noise reduction technology which is suitable for the combination of two modes of body noise reduction and propagation path noise reduction of an oil-immersed transformer, and the result shows that the noise of the transformer body can be effectively reduced through tests under no-load working conditions and full-load working conditions.

Drawings

Fig. 1 is a schematic top view structure diagram of an oil-immersed transformer based on a magnetic damping sound-insulation plate according to the present invention.

Fig. 2 is a schematic structural diagram of the overlapping position of the damping and sound insulation plate in the invention.

FIG. 3 is a schematic diagram of the distribution of noise measurement points according to the present invention.

The reference numerals in the figures denote: 1. a tank housing; 11. a top surface; 12. a bottom surface; 13. a side surface; 2. a damping sound insulation plate; 21. hanging holes; 22. a flexible sound insulating layer; 23. a shaping layer; 3. a magnetic member; 4. a heat sink; 5. and (4) an oil pipe.

Detailed Description

The invention is described in further detail below with reference to the figures and specific examples of the specification.

Fig. 1 to fig. 3 show an embodiment of an oil-immersed transformer based on a magnetic absorption type damping sound-insulation plate according to the present invention, in this embodiment, a damping sound-insulation plate test installation and test is performed on a 110kV test transformer scaling model, and a damping sound-insulation plate 2 is installed between an oil tank shell 1 and a heat sink 4 of a transformer, and is fixed on each side 13 of the oil tank shell 1 of the transformer through a strong magnet; the damping sound insulation board 2 structure comprises two aluminum layers and a flexible sound insulation layer 22, the flexible sound insulation layer 22 is arranged between the two aluminum layers, the two damping sound insulation boards 2 adjacent to the same side 13 are overlapped in a staggered mode inside and outside, and the damping sound insulation boards 2 in the same side 13 are finally connected into a whole.

In this embodiment, the thickness of the damping sound insulation board 2 is 12mm, wherein the thickness of the aluminum layer is 1mm, and the thickness of the flexible sound insulation layer 22 is 10 mm.

The noise characteristics of the transformer before and after the damping sound insulation plate 2 is additionally arranged in the semi-anechoic chamber are tested, the measuring points are arranged around the transformer, 1 point is arranged at each direction, 4 noise measuring points are used, and two transformer working conditions of no-load working condition and load working condition are tested. The test results are shown in the following table:

it can be seen that, after the damping sound insulation plate 2 is additionally arranged on the oil tank shell 1 of the transformer, the noise values of the measuring point 2 and the measuring point 4 are obviously reduced, and the measuring point 1 and the measuring point 3 are slightly reduced, because the damping sound insulation plate 2 can only effectively block the noise transmission of the oil tank shell 1 of the transformer, but the noise on the surface of the radiating fin 4 cannot be isolated, so that the noise value of the measuring point close to the radiating fin 4 is not obviously reduced. Under the no-load working condition, the weight noise value A is reduced by 9dB (A) to the maximum; under the 100% load condition, the weighted noise value A is reduced by 7dB (A) at most.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.

Claims

1. The utility model provides an oil-immersed transformer based on formula damping sound insulation board is inhaled to magnetism, includes oil tank shell (1), its characterized in that: the oil tank shell (1) comprises a top surface (11), a bottom surface (12) and a plurality of side surfaces (13) connected between the top surface (11) and the bottom surface (12), wherein at least one damping sound insulation plate (2) is arranged on each side surface (13) and is fixedly adsorbed through a magnetic component (3).

2. The oil-immersed transformer based on magnetic absorption type damping sound insulation plates according to claim 1, characterized in that: the damping sound insulation board (2) comprises a flexible sound insulation layer (22) and shaping layers (23) clamped on two sides of the flexible sound insulation layer (22).

3. The oil-immersed transformer based on magnetic absorption type damping sound insulation plates according to claim 2, characterized in that: the flexible sound insulation layer (22) is a modified rubber layer, and the sound insulation quantity is not lower than 20 dB.

4. The oil-immersed transformer based on magnetic absorption type damping sound insulation plates according to claim 3, characterized in that: the shaping layer (23) is an aluminum layer.

5. The oil-immersed transformer based on magnetic absorption type damping sound insulation plates according to claim 2, characterized in that: two adjacent damping sound insulation plates (2) positioned on the same side (13) are overlapped, and the seam of the flexible sound insulation layer (22) and the seam of the shaping layer (23) are staggered.

6. The oil-immersed transformer based on magnetic absorption type damping sound insulation plates according to any one of claims 2 to 5, characterized in that: the thickness of flexible sound insulation layer (22) is 10mm, the thickness of design layer (23) is 1 mm.

7. The oil-immersed transformer based on magnetic absorption type damping sound insulation plates according to any one of claims 1 to 5, characterized in that: the thickness of the damping sound insulation plate (2) is 10-30 mm, the height of the damping sound insulation plate (2) is 50-200 mm larger than that of the oil tank shell (1), and the width of the damping sound insulation plate is less than or equal to 1.5 m.

8. The oil-immersed transformer based on magnetic absorption type damping sound insulation plates according to any one of claims 1 to 5, characterized in that: each side surface (13) is provided with a damping sound insulation plate (2).