CN117691496A - Transformer substation with noise reduction function and noise reduction method - Google Patents

Transformer substation with noise reduction function and noise reduction method Download PDF

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Publication number
CN117691496A
CN117691496A CN202311670763.2A CN202311670763A CN117691496A CN 117691496 A CN117691496 A CN 117691496A CN 202311670763 A CN202311670763 A CN 202311670763A CN 117691496 A CN117691496 A CN 117691496A
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CN
China
Prior art keywords
sound insulation
noise reduction
fixedly connected
noise
insulation box
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Pending
Application number
CN202311670763.2A
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Chinese (zh)
Inventor
王安
秦碧岳
宋瑞军
赵晨旭
阿力夫
娜日
吕杰
周文奇
杨力嘉
张振
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Economic and Technological Research Institute of State Grid Inner Mongolia Electric Power Co Ltd
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Economic and Technological Research Institute of State Grid Inner Mongolia Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Economic and Technological Research Institute of State Grid Inner Mongolia Electric Power Co Ltd filed Critical Economic and Technological Research Institute of State Grid Inner Mongolia Electric Power Co Ltd
Priority to CN202311670763.2A priority Critical patent/CN117691496A/en
Publication of CN117691496A publication Critical patent/CN117691496A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a transformer substation with a noise reduction function and a noise reduction method. According to the transformer noise reduction device, resonance generated by operation of the transformer is eliminated through the plurality of damping rubber blocks, so that noise generated by the resonance of the transformer is eliminated, and the noise generated by operation of the transformer is absorbed and isolated through the dampproof sound insulation plate, the sound insulation cotton and the sound absorption plate in the sound insulation box, so that the transformer noise reduction effect is achieved, and noise pollution to the surrounding environment is prevented from damaging human health; noise that can not only keep apart upwards propagate through the inside acoustical panel of carriage and amortization rain-proof cover to can be rain-proof thermal-insulated, through the inside exhaust fan of ventilation pipe with the inside heat discharge of sound insulation box, outside fresh air gets into inside the sound insulation box through the intake pipe simultaneously, thereby reaches the inside ventilation radiating effect of sound insulation box, prevents inside high temperature.

Description

Transformer substation with noise reduction function and noise reduction method
Technical field:
the invention relates to the technical field of transformer substations, in particular to a transformer substation with a noise reduction function and a noise reduction method.
The background technology is as follows:
the transformer station is used for converting voltage and current in a power system, receiving electric energy and distributing the electric energy, the transformer station in a power plant is a boosting transformer station, the electric energy generated by a generator is fed into a high-voltage power grid after being boosted, the transformer station appears from the establishment of the power system in the first real sense, the transformer station is taken as an indispensable part of the power system, and develops together with the power system for more than 100 years, and in the development process of more than 100 years, the transformer station has great changes in the aspects of construction sites, voltage levels, equipment conditions and the like;
the existing transformer substation can cause noise pollution to the surrounding environment in the operation process, noise is sound which is annoying to people or is harmful to human health due to excessive volume, the transformer substation can generate serious influence on human health after being in a noise environment with high decibel for a long time, and some transformer substations are built into box type transformer substations, but have poor noise reduction effect and the interior of the transformer substation is easy to be at high temperature in summer.
The invention comprises the following steps:
the invention aims to provide a transformer substation with a noise reduction function and a noise reduction method, so as to solve one of the problems in the background art.
The invention is implemented by the following technical scheme: the utility model provides a transformer substation and noise reduction method with function of making an uproar falls, includes the amortization subassembly, the amortization subassembly includes concrete base, sound insulation box, soundproof cotton, abatvoix, dampproofing acoustic celotex board, damping rubber piece, mounting bracket and transformer, the upper surface outside fixedly connected with sound insulation box of concrete base, the inside wall fixedly connected with soundproof cotton of sound insulation box, the inside wall fixedly connected with abatvoix of soundproof cotton, the upper surface of concrete base is close to the inboard fixedly connected with dampproofing acoustic celotex board of sound insulation box, dampproofing acoustic celotex board's upper surface is through a plurality of damping rubber piece fixedly connected with mounting bracket, a plurality of transformers are installed to the upper surface of mounting bracket.
As a further preferred aspect of the present invention: the sound insulation box is characterized in that a supporting frame is fixedly connected to the top of the outer side wall of the sound insulation box, a silencing rain-proof cover is fixedly connected to the upper surface of the supporting frame, and a silencing plate is fixedly connected to the inner side walls of the supporting frame and the silencing rain-proof cover.
As a further preferred aspect of the present invention: through holes are formed in two sides of the upper surface of the sound insulation box, the two air exchange pipes are fixedly connected to the inner side walls of the through holes, the two air inlet ends of the air exchange pipes penetrate through two sides of the upper surface of the sound insulation cotton and the sound absorption plate, the two air outlet ends of the air exchange pipes penetrate through two sides of the inner side walls of the supporting frame and the sound absorption plate, and one side, close to the air inlet ends, of the inner side walls of the air exchange pipes is fixedly connected with an exhaust fan.
As a further preferred aspect of the present invention: the sound insulation box is characterized in that through grooves are formed in the lower portions of two sides of the sound insulation box, the inner side walls of the through grooves are fixedly connected with air inlet pipes, and the air outlet ends of the air inlet pipes penetrate through the lower portions of two sides of the sound insulation cotton and the sound absorption plate.
As a further preferred aspect of the present invention: two slots are formed in the lower portion of one side, far away from each other, of the air inlet pipe, the two mounting frames are connected with the inner side walls of the slots in a sliding mode, the dustproof filter screen is mounted on the inner side walls of the mounting frames, one side of each mounting frame is fixedly connected with a sealing plate, one side of each sealing plate is connected with the outer side, close to the slots, of each air inlet pipe in a fitting mode, fixing blocks are fixedly connected to the front surface and the rear surface of each sealing plate, and two faces, close to each fixing block, of each fixing block are fixedly connected to the front surface and the rear surface of each air inlet pipe through screws.
As a further preferred aspect of the present invention: the air outlet ends of the two air exchanging pipes are provided with first protective nets, and the air inlet ends of the two air inlet pipes are provided with second protective nets.
As a further preferred aspect of the present invention: an access hole is formed in the middle of the front surface of the sound insulation box, and an access door is hinged to one side of the inner side wall of the access hole through a hinge.
As a further preferred aspect of the present invention: and one side of the bottom of the rear surface of the sound insulation box is fixedly connected with a junction box.
As a further preferred aspect of the present invention: the middle part of one side of the front surface of the access door is fixedly connected with a handle.
A noise reduction method of a transformer substation with a noise reduction function comprises the following steps:
step one: a plurality of transformers are fixed on the mounting frame, and resonance generated by the operation of the transformers is eliminated through a plurality of damping rubber blocks at the bottom of the mounting frame, so that noise generated by the resonance of the transformers is eliminated conveniently;
step two: the damping rubber blocks are fixed on the moistureproof and soundproof plate on the concrete base, so that noise generated by the operation of the transformer is isolated, moistureproof effect is achieved, and the noise is prevented from being transmitted to the outside through the concrete base;
step three: the transformers are placed in the sound insulation box, and noise generated by operation of the transformers is absorbed and isolated through the sound insulation cotton and the sound absorption plate in the sound insulation box, so that the effect of reducing the noise of the transformer substation is achieved;
step four: the noise is transmitted upwards, and the noise is eliminated through a supporting frame arranged at the top of the sound insulation box and a silencing plate arranged in the silencing rain cover;
step five: the ventilation pipe and the exhaust fan arranged at the top of the sound insulation box are convenient for exhausting heat generated by the operation of the transformer, so that the internal temperature of the sound insulation box is prevented from being too high, and meanwhile, the noise generated by the exhaust fan is eliminated by the support frame and the silencing plate arranged in the silencing and rainproof cover;
step six: the heat inside the sound insulation box is discharged through the exhaust fan, so that external fresh air enters the sound insulation box after being filtered through the dustproof filter screen in the air inlet pipe, and the effect of ventilating and radiating the inside of the sound insulation box is achieved.
The invention has the advantages that:
1. according to the transformer noise reduction device, resonance generated by operation of the transformer is eliminated through the plurality of damping rubber blocks, so that noise generated by the resonance of the transformer is eliminated, noise generated by operation of the transformer is absorbed and isolated through the dampproof sound insulation plate, the sound insulation cotton and the sound absorption plate in the sound insulation box, the effect of reducing noise of a transformer substation is achieved, and noise pollution to surrounding environment is prevented from damaging human health.
2. According to the invention, the noise propagating upwards can be isolated through the supporting frame and the silencing plate in the silencing and rainproof cover, the heat in the sound insulation box is discharged through the exhaust fan in the ventilation pipe, and meanwhile, the external fresh air enters the sound insulation box through the air inlet pipe, so that the effect of ventilating and radiating the inside of the sound insulation box is achieved, and the internal high temperature is prevented.
Description of the drawings:
in order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a view angle structure according to the present invention;
FIG. 2 is a schematic view of another view angle structure of the present invention;
FIG. 3 is a schematic view showing the cut-away structure of the sound-insulating enclosure and the sound-deadening rain cover of the present invention;
FIG. 4 is a schematic view of the structure of the moisture-proof acoustic panel and shock-absorbing rubber block of the present invention;
FIG. 5 is a schematic view of the structure of the ventilation pipe and the exhaust fan of the present invention;
fig. 6 is a schematic view of the structure of the air inlet pipe and the dustproof filter screen of the invention.
In the figure: 1. a sound attenuation assembly; 11. a concrete base; 12. a sound insulation box; 13. soundproof cotton; 14. a sound absorbing panel; 15. a moisture-proof sound-insulating board; 16. damping rubber blocks; 17. a mounting frame; 18. a transformer; 19. a support frame; 20. a silencing rain cover; 21. a muffler plate; 22. a through hole; 23. an air exchanging pipe; 24. an exhaust fan; 25. a through groove; 26. an air inlet pipe; 27. a slot; 28. a mounting frame; 29. a dust-proof filter screen; 30. a sealing plate; 31. a fixed block; 32. a first protection net; 33. a second protection net; 34. an access opening; 35. a hinge; 36. an access door; 37. a junction box; 38. a handle; 39. and (5) a screw.
The specific embodiment is as follows:
the following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
Referring to fig. 1-6, the present invention provides a technical solution: the utility model provides a transformer substation and noise reduction method with function of making an uproar falls, includes noise abatement assembly 1, noise abatement assembly 1 includes concrete base 11, sound insulation case 12, soundproof cotton 13, abatvoix 14, dampproofing acoustic celotex board 15, damping rubber piece 16, mounting bracket 17 and transformer 18, the upper surface outside fixedly connected with sound insulation case 12 of concrete base 11, the inside wall fixedly connected with soundproof cotton 13 of sound insulation case 12, the inside wall fixedly connected with abatvoix 14 of soundproof cotton 13, the upper surface of concrete base 11 is close to the inboard fixedly connected with dampproofing acoustic celotex board 15 of sound insulation case 12, the upper surface of dampproofing acoustic celotex board 15 is through a plurality of damping rubber piece 16 fixedly connected with mounting bracket 17, a plurality of transformers 18 are installed to the upper surface of mounting bracket 17.
In this embodiment, specific: the outer side wall top fixedly connected with braced frame 19 of baffle-box 12, the last fixed surface of braced frame 19 is connected with amortization rain-proof cover 20, the equal fixedly connected with acoustical panel 21 of the inside wall of braced frame 19 and amortization rain-proof cover 20 blocks the rainwater through amortization rain-proof cover 20 to prevent that baffle-box 12 from being erodeed by the rainwater and corroding, increase baffle-box 12's life.
In this embodiment, specific: through holes 22 are formed in two sides of the upper surface of the sound insulation box 12, two air exchanging pipes 23 are fixedly connected to two inner side walls of the through holes 22, air inlet ends of the air exchanging pipes 23 penetrate through two sides of the upper surface of the sound insulation cotton 13 and the sound absorption plate 14, air outlet ends of the air exchanging pipes 23 penetrate through two sides of inner side walls of the supporting frame 19 and the sound absorption plate 21, one side, close to the air inlet end, of the inner side walls of the air exchanging pipes 23 is fixedly connected with an exhaust fan 24, and heat generated by a transformer 18 inside the sound insulation box 12 is conveniently discharged through the exhaust fan 24 inside the air exchanging pipes 23.
In this embodiment, specific: the sound insulation box 12 is characterized in that through grooves 25 are formed in the lower portions of two sides of the sound insulation box 12, air inlet pipes 26 are fixedly connected to the inner side walls of the through grooves 25, the air outlet ends of the air inlet pipes 26 penetrate through the lower portions of two sides of the sound insulation cotton 13 and the sound absorption plate 14, and external fresh air enters the sound insulation box 12 through the air inlet pipes 26, so that ventilation and cooling are conveniently carried out inside the sound insulation box 12.
In this embodiment, specific: two slot 27 has all been seted up to one side lower part that intake pipe 26 kept away from mutually, two the equal sliding connection of inside wall of slot 27 has mounting frame 28, dustproof filter screen 29 is installed to the inside wall of mounting frame 28, one side fixedly connected with closing plate 30 of mounting frame 28, one side laminating of closing plate 30 is connected in the outside that one side of intake pipe 26 is close to slot 27, the equal fixedly connected with fixed block 31 of front surface and rear surface of closing plate 30, two the one side that the fixed block 31 is close to mutually is respectively through screw 39 fixed connection in front surface and rear surface one side of intake pipe 26, through intake pipe 26 internally mounted's dustproof filter screen 29 to dust particle in the filtered air of being convenient for prevents that dust particle from getting into inside the baffle 12 and causing the internal equipment damage.
In this embodiment, specific: the first protection net 32 is installed to the end of giving vent to anger of two the air exchange tube 23, and the second protection net 33 is installed to the end of admitting air of two the intake pipe 26, protects air exchange tube 23 and intake pipe 26 through first protection net 32 and second protection net 33 to prevent insect birds etc. from entering inside the sound insulation box 12 through air exchange tube 23 and intake pipe 26.
In this embodiment, specific: an access door 34 is formed in the middle of the front surface of the sound insulation box 12, an access door 36 is hinged to one side of the inner side wall of the access door 34 through a hinge 35, and the access door 36 is opened, so that workers can conveniently enter the sound insulation box 12 to overhaul and maintain internal equipment of the sound insulation box.
In this embodiment, specific: a junction box 37 is fixedly connected to one side of the bottom of the rear surface of the sound insulation box 12, and external equipment is conveniently connected through the junction box 37.
In this embodiment, specific: the middle part of one side of the front surface of the access door 36 is fixedly connected with a handle 38, and the access door 36 is conveniently pulled to be opened by the handle 38.
A noise reduction method of a transformer substation with a noise reduction function comprises the following steps:
step one: a plurality of transformers 18 are fixed on the mounting frame 17, and resonance generated by the operation of the transformers 18 is eliminated through a plurality of damping rubber blocks 16 at the bottom of the mounting frame 17, so that noise generated by the resonance of the transformers 18 is eliminated conveniently;
step two: the damping rubber blocks 16 are fixed on the moistureproof sound insulation plate 15 on the concrete base 11, so that noise generated by the operation of the transformer 18 is isolated, moistureproof effect is realized, and the noise is prevented from being transmitted to the outside through the concrete base 11;
step three: the transformer 18 is arranged in the sound insulation box 12, and noise generated by operation of the transformer 18 is absorbed and isolated through the sound insulation cotton 13 and the sound absorption plate 14 in the sound insulation box 12, so that the effect of reducing the noise of the transformer substation is achieved;
step four: as the noise is upwardly spread, the upwardly spread noise is eliminated by the support frame 19 provided at the top of the soundproof case 12 and the muffler plate 21 inside the muffler and rainproof cover 20;
step five: the ventilation pipe 23 and the exhaust fan 24 arranged at the top of the sound insulation box 12 are convenient for exhausting heat generated by the operation of the transformer 18, so that the excessive temperature inside the sound insulation box 12 is prevented, and meanwhile, the noise generated by the exhaust fan 24 is eliminated by the support frame 19 and the silencing plate 21 inside the silencing and rainproof cover 20;
step six: the heat in the sound insulation box 12 is discharged through the exhaust fan 24, so that the external fresh air enters the sound insulation box 12 after being filtered through the dustproof filter screen 29 in the air inlet pipe 26, and the effect of ventilating and radiating the interior of the sound insulation box 12 is achieved.
During operation principle or structure principle, during the use, resonance that produces transformer 18 operation through a plurality of damping rubber blocks 16 of mounting bracket 17 bottom is eliminated, thereby be convenient for eliminate the noise that transformer 18 resonance produced, dampproofing acoustic celotex board 15 through damping rubber block 16 bottom, thereby keep apart transformer 18 operation production noise, and play dampproofing effect, through the inside soundproof cotton 13 of baffle box 12 and acoustic celotex board 14 to transformer 18 operation production noise absorb and keep apart, thereby reach the effect of making an uproar, through the sound attenuation board 21 of supporting frame 19 and amortization rain-proof cover 20 inside, thereby eliminate the noise that upwards propagates, exhaust fan 24 through the inside of ventilation pipe 23, thereby be convenient for discharge the heat that transformer 18 operation produced, outside fresh air gets into inside baffle box 12 after filtering through dustproof filter screen 29 in the intake pipe 26 simultaneously, thereby reach the effect of ventilating and radiating to the inside of baffle box 12, prevent that inside high temperature of baffle box 12 from leading to the internal equipment unable operation.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims (10)

1. The utility model provides a transformer substation with function of making an uproar is fallen, its characterized in that includes noise abatement subassembly (1), noise abatement subassembly (1) include concrete base (11), sound insulation case (12), soundproof cotton (13), abatvoix (14), dampproofing acoustic celotex board (15), damping rubber piece (16), mounting bracket (17) and transformer (18), the upper surface outside fixedly connected with sound insulation case (12) of concrete base (11), the inside wall fixedly connected with soundproof cotton (13) of sound insulation case (12), the inside wall fixedly connected with abatvoix (14) of soundproof cotton (13), the upper surface of concrete base (11) is close to the inboard fixedly connected with dampproofing acoustic celotex board (15) of sound insulation case (12), the upper surface of dampproofing acoustic celotex board (15) is through a plurality of damping rubber piece (16) fixedly connected with mounting bracket (17), the upper surface mounting bracket (17) has a plurality of transformers (18).
2. The transformer substation with the noise reduction function according to claim 1, wherein a supporting frame (19) is fixedly connected to the top of the outer side wall of the sound insulation box (12), a noise reduction and rain protection cover (20) is fixedly connected to the upper surface of the supporting frame (19), and noise reduction plates (21) are fixedly connected to the inner side walls of the supporting frame (19) and the noise reduction and rain protection cover (20).
3. The transformer substation with the noise reduction function according to claim 2, wherein through holes (22) are formed in two sides of the upper surface of the sound insulation box (12), two air exchanging pipes (23) are fixedly connected to inner side walls of the through holes (22), air inlet ends of the two air exchanging pipes (23) penetrate through two sides of the upper surface of the sound insulation cotton (13) and the sound absorbing plate (14), air outlet ends of the two air exchanging pipes (23) penetrate through two sides of inner side walls of the supporting frame (19) and the sound absorbing plate (21), and one side, close to the air inlet ends, of the inner side walls of the air exchanging pipes (23) is fixedly connected with an exhaust fan (24).
4. A transformer substation with noise reduction function according to claim 3, characterized in that the lower parts of two sides of the sound insulation box (12) are provided with through grooves (25), the inner side walls of the two through grooves (25) are fixedly connected with air inlet pipes (26), and the air outlet ends of the air inlet pipes (26) on two sides penetrate through the lower parts of two sides of the sound insulation cotton (13) and the sound absorption plate (14).
5. The transformer substation with noise reduction function according to claim 4, wherein the slots (27) are formed in the lower portions of the two sides, away from each other, of the air inlet pipe (26), the installation frames (28) are slidably connected to the inner side walls of the two slots (27), the dustproof filter screen (29) is installed on the inner side walls of the installation frames (28), the sealing plate (30) is fixedly connected to one side of the installation frames (28), one side of the sealing plate (30) is attached to the outer side, close to the slot (27), of the air inlet pipe (26), fixing blocks (31) are fixedly connected to the front surface and the rear surface of the sealing plate (30), and the sides, close to each other, of the two fixing blocks (31) are fixedly connected to the front surface and the rear surface of the air inlet pipe (26) through screws (39) respectively.
6. The transformer substation with the noise reduction function according to claim 5, wherein the air outlet ends of the two ventilation pipes (23) are provided with a first protection net (32), and the air inlet ends of the two air inlet pipes (26) are provided with a second protection net (33).
7. The transformer substation with the noise reduction function according to claim 1, wherein an access opening (34) is formed in the middle of the front surface of the sound insulation box (12), and an access door (36) is hinged to one side of the inner side wall of the access opening (34) through a hinge (35).
8. The transformer substation with the noise reduction function according to claim 7, wherein a junction box (37) is fixedly connected to one side of the bottom of the rear surface of the sound insulation box (12).
9. The transformer substation with the noise reduction function according to claim 7, wherein a handle (38) is fixedly connected to the middle part of one side of the front surface of the access door (36).
10. A method of noise reduction of a substation with noise reduction function according to any of claims 1-9, comprising the steps of:
step one: a plurality of transformers (18) are fixed on a mounting frame (17), and resonance generated by the operation of the transformers (18) is eliminated through a plurality of damping rubber blocks (16) at the bottom of the mounting frame (17), so that noise generated by the resonance of the transformers (18) is eliminated conveniently;
step two: the damping rubber blocks (16) are fixed on the moistureproof sound insulation plate (15) on the concrete base (11), so that noise generated by the operation of the transformer (18) is isolated, the moistureproof effect is achieved, and the noise is prevented from being transmitted to the outside through the concrete base (11);
step three: the transformers (18) are placed in the sound insulation box (12), and noise generated by operation of the transformers (18) is absorbed and isolated through the sound insulation cotton (13) and the sound absorption plate (14) in the sound insulation box (12), so that the effect of reducing the noise of a transformer substation is achieved;
step four: the noise is transmitted upwards, and the noise transmitted upwards is eliminated through a supporting frame (19) arranged at the top of the sound insulation box (12) and a silencing plate (21) arranged inside a silencing rain cover (20);
step five: the ventilation pipe (23) and the exhaust fan (24) are arranged at the top of the sound insulation box (12) so as to be convenient for exhausting heat generated by the operation of the transformer (18), the excessive high temperature inside the sound insulation box (12) is prevented, and meanwhile, the noise generated by the exhaust fan (24) is eliminated by the support frame (19) and the silencing plate (21) inside the silencing rain cover (20);
step six: the heat in the sound insulation box (12) is discharged through the exhaust fan (24), so that external fresh air enters the sound insulation box (12) after being filtered through the dustproof filter screen (29) in the air inlet pipe (26), and the effect of ventilating and radiating the inside of the sound insulation box (12) is achieved.
CN202311670763.2A 2023-12-06 2023-12-06 Transformer substation with noise reduction function and noise reduction method Pending CN117691496A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311670763.2A CN117691496A (en) 2023-12-06 2023-12-06 Transformer substation with noise reduction function and noise reduction method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311670763.2A CN117691496A (en) 2023-12-06 2023-12-06 Transformer substation with noise reduction function and noise reduction method

Publications (1)

Publication Number Publication Date
CN117691496A true CN117691496A (en) 2024-03-12

Family

ID=90131152

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311670763.2A Pending CN117691496A (en) 2023-12-06 2023-12-06 Transformer substation with noise reduction function and noise reduction method

Country Status (1)

Country Link
CN (1) CN117691496A (en)

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