Low-noise extra-high voltage shunt reactor

Abstract

The utility model belongs to the field of reactors, and relates to a low-noise extra-high voltage shunt reactor, which comprises an oil tank, an ascending flanged base and a cooling system, an oil tank composite noise reduction structure is mounted on the inner side of the wall of the oil tank, and an oil tank outer noise reduction mechanism is mounted on the outer side of the wall of the oil tank; the oil tank composite noise reduction structure comprises a rubber plate installed in the oil tank wall, a sound-absorption-hole-free paperboard is installed on the inner side of the rubber plate, and a double-layer composite perforated plate sound absorption mechanism is installed on the inner side of the sound-absorption-hole-free paperboard. The oil tank outer side noise reduction mechanism comprises a reinforcing iron shell, the reinforcing iron shell comprises a closed side plate and an open side, a quartz sand layer is arranged on the inner side of the closed side plate, a long-strip-shaped pressing plate is arranged on the inner side of the quartz sand layer, a sound insulation plate and sound absorption cotton are arranged on the inner side of the long-strip-shaped pressing plate, and the open side is welded to the outer surface of the oil tank wall. Vibration waves transmitted from insulating oil can be blocked and weakened, and noise is prevented from penetrating through the oil tank to be transmitted outwards; the noise reduction mechanism outside the oil tank can further prevent noise of the oil tank from spreading to the distance.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of electric reactor, specifically relates to a low noise extra -high voltage shunt reactor. BACKGROUND

[0002] According to novel electric power system construction needs, low noise operation has become the important requirement to electric power equipment, and as the key component in the power grid, the noise problem caused by extra -high voltage shunt reactor is more and more cause attention. With the wide application of extra -high voltage shunt reactor, the noise phenomenon of field feedback also gradually increases. The sound pressure level of part shunt reactor case is high, and the frequency composition is complex, causes the great influence to power station operation. Too much noise can also bring vibration problem, and long -term vibration can cause material micro -crack propagation, material failure, can lead to bolt pre -tightening force relaxation, connection failure, also can cause the metal debris inside equipment, influence equipment's insulation capacity, and the harm is very big.

[0003] The reason that extra -high voltage shunt reactor produces noise is mainly that the noise is produced by the vibration of the iron core inside the oil tank and is propagated to the outside through the oil tank. The existing reactor oil tank shell structure is simple, and cannot effectively block the noise propagation to the outside. Therefore, to fundamentally solve the problem of the noise of extra -high voltage shunt reactor, comprehensive technical improvement needs to be carried out from the oil tank structure. SUMMARY

[0004] The utility model discloses to the current problem of the noise of extra -high voltage reactor, provide a kind of low noise extra -high voltage reactor design scheme that can solve the foregoing problem. The design scheme that realizes the purpose described in the utility model is as follows:

[0005] Low noise extra -high voltage shunt reactor, including oil tank and the elevated seat and cooling system that communicate with oil tank, install oil tank composite noise reduction structure in oil tank box wall inner side, install oil tank outside noise reduction mechanism in oil tank box wall outside;

[0006] The oil tank composite noise reduction structure includes rubber plate fixedly installed in the inside of oil tank box wall, the inner wall surface of oil tank box wall is attached to the outside of rubber plate, the double-layer composite perforated plate sound absorption mechanism is fixedly installed in the inside of no sound absorption hole paperboard, the clearance is reserved between rubber plate, no sound absorption hole paperboard and double-layer composite perforated plate sound absorption mechanism, and the clearance is reserved between the two layers of perforated plate of double-layer composite perforated plate sound absorption mechanism;

[0007] The oil tank outside noise reduction mechanism comprises a reinforced iron shell, the reinforced iron shell comprises oppositely arranged closed side plates and an open side, the closed side plate is integrally formed with a surrounding side plate on one side to form the open side, a quartz sand layer is arranged on the inner side of the closed side plate, a plurality of long strip pressing plates are uniformly arranged on the inner side of the quartz sand layer, the two ends of the long strip pressing plate are welded on the left and right inner walls of the reinforced iron shell, and the inner side of the long strip pressing plate is sequentially provided with a sound insulation plate and sound absorbing cotton.

[0008] Preferably, the double-layer composite perforated plate sound absorption mechanism comprises a perforated paperboard I and a perforated paperboard II, the perforated paperboard I is provided with sound absorption holes I with a diameter of 10 mm, and the center distance between adjacent sound absorption holes I is 100 mm; the perforated paperboard II is provided with sound absorption holes II with a diameter of 10 mm, and the center distance between adjacent sound absorption holes II is 50 mm.

[0009] Preferably, the fixed nut is welded on the inner side wall of the oil tank wall, and a through hole I corresponding to the fixed nut is formed in the rubber plate; a pad I is mounted on the inner side of the rubber plate, a through hole II corresponding to the fixed nut is formed in the center of the pad I; a non-sound absorption hole paperboard is mounted on the inner side of the pad I, and a through hole III corresponding to the fixed nut is formed in the non-sound absorption hole paperboard; one end of the insulating screw rod is screwed into the fixed nut; a pad II is mounted on the inner side of the non-sound absorption hole paperboard, a stepped through hole is formed in the center of the pad II, the outer end of the stepped through hole corresponds to the fixed nut, and the inner end of the stepped through hole corresponds to the insulating screw rod; a perforated paperboard I is mounted on the inner side of the pad II, and a through hole IV corresponding to the insulating screw rod is formed in the perforated paperboard I; a pad III is mounted on the inner side of the perforated paperboard I, a through hole V corresponding to the insulating screw rod is formed in the center of the pad III; a perforated paperboard II is mounted on the inner side of the pad III, and a through hole VI corresponding to the insulating screw rod is formed in the perforated paperboard II; a pad IV is mounted on the inner side of the perforated paperboard II, and a through hole VII corresponding to the insulating screw rod is formed in the center of the pad IV; the other end of the insulating screw rod is threadedly mounted with an insulating nut II and an insulating nut I.

[0010] Preferably, the fixed nut is made of stainless steel, the insulating screw rod is made of M20 glass fiber screw rod, the insulating nut II and the insulating nut I are made of M20 glass fiber nut, the rubber plate is made of shock-absorbing and noise-reducing special rubber pad, and the non-sound absorption hole paperboard, the perforated paperboard I and the perforated paperboard II are all made of insulating paperboard.

[0011] Preferably, the rubber plate, the non-sound absorption hole paperboard, the perforated paperboard I and the perforated paperboard II are all processed into U-shaped structures by bending the whole plates.

[0012] Preferably, the circumference of the open side is greater than the circumference of the closed side plate.

[0013] Preferably, the reinforced iron shell is made of low-alloy steel plate.

[0014] Preferably, the long strip pressing plate is made of low-alloy steel plate.

[0015] The utility model discloses the beneficial effect of:

[0016] 1, the oil tank inner wall sets up the oil tank compound noise reduction structure that is composed of the rubber plate and multilayer insulating paper board, and the vibration wave that comes from the insulation oil conduction is blocked and weakened through the material combination of different medium, can reduce the vibration noise, avoids the noise penetration oil tank to spread to the outside,

[0017] 2, the oil tank outer wall sets up the oil tank outside noise reduction mechanism that is composed of the quartz sand layer, the soundproof board and the sound-absorbing cotton that the tank wall side sets up, plays the compound noise reduction effect of sound absorption and sound insulation, avoids the noise of oil tank to spread to the distance.

[0018] 3, the utility model discloses the low noise ultrahigh voltage shunt reactor, reduces 62.3dB (A) from 75dB (A) to the noise, effectively solves the difficult problem of ultrahigh voltage reactor vibration, noise, realizes the friendly protection to the surrounding environment, and has the great significance to support the national ultrahigh voltage power grid construction. DRAWINGS

[0019] The drawings are used to provide further understanding of the utility model, and constitute a part of the specification, and are used to explain the utility model with the embodiment of the utility model, and do not constitute the limitation to the utility model. In the drawings:

[0020] Figure 1 It is the external structure front view of the low noise ultrahigh voltage shunt reactor of the utility model embodiment one,

[0021] Figure 2 It is the external structure left view of the low noise ultrahigh voltage shunt reactor of the utility model embodiment one,

[0022] Figure 3 It is the overhead view of the oil tank compound noise reduction structure of the utility model embodiment one,

[0023] Figure 4 It is Figure 3 The local enlarged view of B in,

[0024] Figure 5 It is the local structure schematic view of the perforated paperboard one of the utility model embodiment one,

[0025] Figure 6 It is the local structure schematic view of the perforated paperboard two of the utility model embodiment one,

[0026] Figure 7 It is the front view of the oil tank outside noise reduction mechanism of the utility model embodiment two,

[0027] Figure 8 It is the horizontal direction sectional view of the oil tank outside noise reduction mechanism of the utility model embodiment two,

[0028] Among them, 1. oil tank, 2. lifting seat, 3. cooling system, 4. perforated cardboard two, 5. pad one, 6. pad two, 7. pad three, 8. pad four, 9. insulating nut one, 10. insulating screw, 11. fixing nut, 12. oil tank wall, 13. insulating nut two, 14. sound-absorbing hole one, 15. sound-absorbing hole two, 16. glue board, 17. cardboard without sound-absorbing holes, 18. perforated cardboard one, 19. long strip pressure plate, 20. reinforced iron shell, 21. sound-absorbing cotton, 22. sound insulation board, 23. quartz sand layer. Detailed Implementation

[0029] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments. Example 1

[0030] like Figures 1-6 As shown, the low-noise ultra-high voltage parallel reactor mainly comprises an oil tank 1, a cooling system 3, and a riser 2 in its external main structure. To achieve noise reduction, this utility model embodiment focuses on innovating and improving the structure of the inner wall of the oil tank 1, installing a composite noise reduction structure on the inner side of the oil tank wall. The composite noise reduction structure is divided into two parts, symmetrically fixedly installed on the inner walls of the oil tank wall 12 on both sides of the iron core yoke. The composite noise reduction structure is not installed on the cooling side and the outlet side of the oil tank wall 12. The composite noise reduction structure is a composite structure composed of a rubber sheet 16 and multiple layers of cardboard, with gaps between each pair of adjacent layers. Specifically, it includes: a rubber sheet 16, a cardboard without sound-absorbing holes 17, a perforated cardboard one 18, and a perforated cardboard two 4. The rubber sheet 16, the cardboard without sound-absorbing holes 17, the perforated cardboard one 18, and the perforated cardboard two 4 are fixedly installed using fixing nuts 11, insulating screws 10, insulating nuts one 9, and insulating nuts two 13. The fixing nut 11 is welded to the inner wall surface of the tank wall 12. The position and number of fixing nuts 11 are preferably sufficient to reliably fix the composite noise reduction structure of the tank. The fixing nuts 11 are preferably made of stainless steel. One end of the insulating screw 10 is screwed into the fixing nut 11. The insulating screw 10 is made of M20 high-strength glass fiber screw.

[0031] The rubber plate 16 is made of 10mm thick shock-absorbing and noise-reducing special rubber pad. A through hole corresponding to the fixing nut 11 is opened on the rubber plate 16. The rubber plate 16 is fitted onto the outer periphery of the fixing nut 11 through the through hole, and the outer side of the rubber plate 16 is arranged in close contact with the inner side wall surface of the tank wall 12.

[0032] The inner side of the rubber plate 16 is fixedly installed with a spacer 5, a through hole 2 corresponding to the fixing nut 11 is formed in the center of the spacer 5, the spacer 5 is sleeved on the outer periphery of the fixing nut 11 through the through hole 2, and the thickness of the spacer 5 is 10 mm, so that a 10 mm gap is left between the rubber plate 16 and the sound-absorbing holeless paperboard 17, the rubber plate 16 is prevented from directly contacting the sound-absorbing holeless paperboard 17, and noise is reduced.

[0033] The inner side of the spacer 5 is fixedly installed with the sound-absorbing holeless paperboard 17, the sound-absorbing holeless paperboard 17 is an insulating paperboard with a thickness of 3 mm, a through hole 3 corresponding to the fixing nut 11 is formed in the sound-absorbing holeless paperboard 17, and the sound-absorbing holeless paperboard 17 is sleeved on the outer periphery of the fixing nut 11 through the through hole 3.

[0034] The inner side of the sound-absorbing holeless paperboard 17 is fixedly installed with a spacer 6, the thickness of the spacer 6 is 25 mm, a stepped through hole is formed in the center of the spacer 6, the outer end of the stepped through hole corresponds to the fixing nut 11, the inner end of the stepped through hole corresponds to the insulating screw rod 10, the fixing nut 11 and the insulating screw rod 10 respectively pass through the two ends of the stepped through hole of the spacer 6, and the insulating screw rod 10 and the fixing nut 11 cooperate to prevent the spacer 6 from falling off.

[0035] The inner side of the spacer 6 is fixedly installed with a perforated paperboard 1 8, the perforated paperboard 1 8 is an insulating paperboard with a thickness of 2 mm, a through hole 4 corresponding to the insulating screw rod 10 is formed in the perforated paperboard 1 8, and the insulating screw rod 10 is fixed by passing through the through hole 4. In addition, the perforated paperboard 1 8 regularly drills sound-absorbing holes 1 4 with a specification of φ 10 mm at the remaining positions, the hole centers of adjacent sound-absorbing holes 1 4 are spaced apart by 100 mm, as shown in the figure. Figure 3

[0036] The inner side of the perforated paperboard 1 8 is fixedly installed with a spacer 7, the thickness of the spacer 7 is 25 mm, a through hole 5 corresponding to the insulating screw rod 10 is formed in the center of the spacer 7, and the spacer 7 is sleeved on the outer periphery of the insulating screw rod 10 through the through hole 5.

[0037] The inner side of the spacer 7 is fixedly installed with a perforated paperboard 2 4, the perforated paperboard 2 4 is an insulating paperboard with a thickness of 2 mm, a through hole 6 corresponding to the insulating screw rod 10 is formed in the perforated paperboard 2 4, and the insulating screw rod 10 is fixed by passing through the through hole 6. In addition, the perforated paperboard 2 4 regularly drills sound-absorbing holes 2 1 5 with a specification of φ 10 mm at the remaining positions, the hole centers of adjacent sound-absorbing holes 2 1 5 are spaced apart by 50 mm, as shown in the figure. The perforated paperboard 2 4 and the perforated paperboard 1 8 constitute a double-layer composite perforated plate sound-absorbing mechanism. Figure 4

[0038] ​​The inner side of the perforated paperboard two 4 is fixedly provided with a cushion four 8, the thickness of the cushion four 8 is 8 mm, a through hole seven corresponding to the insulating screw rod 10 is formed in the center position of the cushion four 8, and the cushion four 8 is sleeved on the outer periphery of the insulating screw rod 10 through the through hole seven. By arranging the cushion four 8, the stress area of the perforated paperboard two 4 can be increased, so that the fastening force of the insulating nut two 13 is more evenly distributed on the perforated paperboard two 4.

[0039] The insulating nut two 13 and the insulating nut one 9 are threadedly arranged at the other end of the insulating screw rod 10, the insulating nut two 13 is adjacent to the perforated paperboard two 4, the insulating nut two 13 and the insulating nut one 9 are M20 high-strength glass fiber nuts, and the double-nut structure of the insulating nut two 13 and the insulating nut one 9 can effectively prevent loosening.

[0040] The representative product of the shock-absorbing and noise-reducing special rubber pad is NP rubber specially developed and independently named by the Shengma Company, and the NP rubber is used to distinguish from other rubber types, and the rubber type of the NP rubber is NP70. The NP rubber has good compression and rebound characteristics, can reduce the vibration transmission of the internal structure of the oil tank, has a high loss factor, can convert mechanical energy into heat energy, and can be used as a damping material. In the embodiment of the utility model, a layer of rubber plate 16 made of NP rubber material is arranged on the inner side of the oil tank wall 12, which can effectively reduce the vibration transmission between the reactor body and the oil tank and reduce the structural noise of the oil tank.

[0041] The insulating paperboard is designed as single-layer non-absorbing hole paperboard 17 plus double-layer composite perforated plate sound absorption mechanism, a large number of small holes are drilled on the perforated paperboard one 18 and the perforated paperboard two 4 according to certain arrangement rules, and a certain thickness gap is left behind the paperboard. When sound waves are incident, the transformer oil in the gap will reciprocate, due to the frictional damping with the small hole wall, part of the sound energy is converted into heat energy and is lost, so that the purpose of noise reduction is achieved. The double-layer composite perforated plate sound absorption mechanism with different perforation rates can improve the sound absorption coefficient, effectively widen the sound absorption frequency band, and improve the noise reduction performance of the perforated plate resonance sound absorption structure. According to relevant research, the main vibration frequency of the 50Hz reactor is 100Hz. When the double-layer composite perforated plate sound absorption mechanism has a perforation rate in the range of 1%-10%, a plate thickness of 2-13mm and a gap thickness of 6-100mm, the resonance frequency is 100-400Hz, which is consistent with the main vibration frequency of the reactor, and can be used for resonance sound absorption of the reactor noise. The utility model adopts single-layer non-absorbing hole paperboard 17 plus double-layer composite perforated plate sound absorption mechanism, and the three layers of paperboards are: one layer of 3mm-thick non-absorbing hole paperboard 17, one layer of 2mm-thick perforated paperboard one 18 (the perforation rate is about 1%), and one layer of 2mm-thick perforated paperboard two 4 (the perforation rate is about 3%, the hole diameter of the perforated paperboard two 4 is 10mm (the radius is 5mm), the hole center distance is 50mm, and the perforation rate is π×5×5 / (50×50)=3.14%, about 3%), and the paperboard gap is 25mm.

[0042] The oil tank composite noise reduction structure is arranged inside the two side yoke side tank walls and extends to the inside of the high pressure side and cooling side partial tank walls by bending. The tank wall is closest to the core at this position, which is the main channel for the noise of the reactor to transmit outward, and arranging the oil tank composite noise reduction structure can achieve obvious noise reduction effect. Further, the rubber plate 16, the non-absorbing hole paper plate 17, the first perforated paper plate 18 and the second perforated paper plate 4 are all subjected to bending treatment by using an integral plate, and the horizontal section of the rubber plate 16, the non-absorbing hole paper plate 17, the first perforated paper plate 18 and the second perforated paper plate 4 after the bending treatment is all U-shaped. The integral U-shaped structure not only ensures the noise reduction effect, but also is more convenient to assemble. The whole set of noise reduction structure is fixed by using high-strength glass fiber screws and nuts, and does not use glue to bond. The installation and disassembly are convenient, safe and environmentally friendly. Embodiment two

[0043] As shown in Figure 7 , 8 Embodiment two of the utility model is based on embodiment one, and the structure of the outer side tank wall of the oil tank 1 is innovated and improved. An oil tank outer side noise reduction mechanism is installed on the outer side of the oil tank wall 12, which includes a reinforced iron shell 20. The reinforced iron shell 20 includes a closed side plate that is away from the oil tank wall 12 and is arranged in parallel with the oil tank wall 12. A surrounding side plate is integrally formed around the side of the closed side plate close to the oil tank wall 12. The end of the surrounding side plate close to the oil tank wall 12 is an open side, and the circumference of the open side is greater than the circumference of the closed side plate. The open side surface of the reinforced iron shell 20 is fixed and welded to the position of the outer surface of the oil tank wall 12 of the extra-high voltage reactor oil tank. The structure of the reinforced iron shell 20 with a small outer side and a large inner side can make the welding more firm. The central section of the reinforced iron shell 20 in the front view direction is a boat-shaped structure, and the central section of the reinforced iron shell 20 in the top view direction is a U-shaped structure. The reinforced iron shell 20 is made of high-strength, corrosion-resistant low-alloy steel plate to ensure the durability and stability of the oil tank noise reduction mechanism.

[0044] A plurality of horizontal long strip pressing plates 19 are welded and installed on the left and right inner walls of the reinforced iron shell 20 at a certain upper and lower interval distance, Figure 1The long strip pressing plate 19 in the figure is a perspective effect, and is located in the inside of the reinforced iron shell 20. The long strip pressing plate 19 is made of low alloy steel plate, both ends of the long strip pressing plate 19 are firmly welded with the left and right inner walls of the reinforced iron shell 20, and a layer of dry quartz sand layer 23 is first arranged on the inside of the closed side plate of the reinforced iron shell 20. The quartz sand layer 23 is used as the outermost part of the noise barrier, and a plurality of long strip pressing plates 19 are combined together to preliminarily fix the quartz sand layer 23. The inside of the long strip pressing plate 19 is sequentially provided with the sound insulation plate 22 and the sound-absorbing cotton 21, and the sound-absorbing cotton 21 is adjacent to the oil tank wall 12. The sound insulation plate 22 and the sound-absorbing cotton 21 can tightly fill the internal space of the reinforced iron shell 20, further fix the quartz sand layer 23, and the combination of the two materials can have the double performance of sound absorption and sound insulation, so as to achieve the best technical effect of sound absorption and sound insulation.

[0045] The processing method of the oil tank outside noise reduction mechanism provided in the embodiment two of the utility model is as follows:

[0046] The closed side plate of the reinforced iron shell 20 is placed horizontally on the ground, and a layer of dry quartz sand layer 23 is laid above the closed side plate. Then, a plurality of long strip pressing plates 19 are welded on the left and right inner walls of the reinforced iron shell 20, the length of the long strip pressing plate 19 is matched with the distance between the left and right inner walls of the reinforced iron shell 20, the plurality of long strip pressing plates 19 are uniformly arranged at a certain distance, the plurality of long strip pressing plates 19 form a stable filling frame, the quartz sand layer 23 is preliminarily fixed, and the sound insulation plate 22 and the sound-absorbing cotton 21 are sequentially placed above the long strip pressing plate 19. It is ensured that the sound insulation plate 22 and the sound-absorbing cotton 21 can tightly fill the internal space of the reinforced iron shell 20, and the filling material is full without gap, so as to achieve the best sound absorption and sound insulation effect. Finally, the reinforced iron shell 20 is integrally welded on the outside of the oil tank wall 12, the closed side plate is arranged in parallel with the oil tank wall 12, and the noise reduction mechanism can be distributed on the outside of the oil tank wall 12 according to actual needs, so as to construct a stable and efficient noise protection barrier, which can effectively block the noise generated in the operation process of the reactor.

[0047] In the embodiment of the utility model, the technical features not described in detail are prior art or conventional technical means, which will not be described here.

[0048] Finally, it needs to be explained that: the above examples, only for the specific embodiments of the present application, to illustrate the technical scheme of the present application, and not limited to it, the protection scope of the present application is not limited to this. Those skilled in the art should understand: any familiar with the technical field of the technical personnel in the technical range disclosed by the present application, it can be modified or easily thought of changes to the technical solutions recorded in the foregoing examples, or part of the technical features of the equivalent replacement; and these modifications, changes or replacement, without the essence of the corresponding technical scheme deviate from the spirit and scope of the present application embodiment technical scheme, all should be covered in the protection scope of the present application.

Claims

1. A low-noise extra-high voltage shunt reactor comprising an oil tank (1) and a raised seat (2) and a cooling system (3) in communication with the oil tank (1), characterized in that, The oil tank composite noise reduction structure is arranged on the inner side of the oil tank wall (12), and the oil tank outer noise reduction mechanism is arranged on the outer side of the oil tank wall (12); The oil tank composite noise reduction structure comprises a rubber plate (16) fixedly arranged on the inner side of the oil tank wall (12), the outer side of the rubber plate (16) is attached to the inner wall surface of the oil tank wall (12), the inner side of the rubber plate (16) is fixedly arranged with a non-absorbing hole paperboard (17), the inner side of the non-absorbing hole paperboard (17) is fixedly arranged with a double-layer composite perforated plate sound absorption mechanism, gaps are reserved between the rubber plate (16), the non-absorbing hole paperboard (17) and the double-layer composite perforated plate sound absorption mechanism, and a gap is reserved between the two layers of perforated plates of the double-layer composite perforated plate sound absorption mechanism; The oil tank outer noise reduction mechanism comprises a reinforced iron shell (20), the reinforced iron shell (20) comprises a closed side plate and an open side plate arranged oppositely, the closed side plate is integrally formed with a surrounding side plate on one side to form the open side plate, a quartz sand layer (23) is arranged on the inner side of the closed side plate, a plurality of long strip pressing plates (19) are arranged on the inner side of the quartz sand layer (23) at equal intervals, the two ends of the long strip pressing plates (19) are welded to the left and right inner walls of the reinforced iron shell (20), sound insulation plates (22) and sound absorbing cotton (21) are sequentially arranged on the inner side of the long strip pressing plates (19), and the open side plate of the reinforced iron shell (20) is welded to the outer surface of the oil tank wall (12).

2. The low-noise EHV shunt reactor of claim 1, wherein, The double-layer composite perforated plate sound absorption mechanism comprises a perforated paperboard I (18) and a perforated paperboard II (4), sound absorbing holes I (14) with a diameter of 10 mm are arranged on the perforated paperboard I (18), the center distance between adjacent sound absorbing holes I (14) is 100 mm, sound absorbing holes II (15) with a diameter of 10 mm are arranged on the perforated paperboard II (4), and the center distance between adjacent sound absorbing holes II (15) is 50 mm.

3. The low-noise EHV shunt reactor of claim 2, wherein, The fixed nut (11) is welded on the inner wall of the oil tank wall (12), the rubber plate (16) is provided with a through hole I corresponding to the fixed nut (11), the rubber plate (16) is provided with a pad I (5) on the inner side, the pad I (5) is provided with a through hole II corresponding to the fixed nut (11) at the center position, the pad I (5) is provided with a non-absorbing hole paper plate (17) on the inner side, the non-absorbing hole paper plate (17) is provided with a through hole III corresponding to the fixed nut (11), one end of the insulating screw rod (10) is screwed into the fixed nut (11), the pad II (6) is provided on the inner side of the non-absorbing hole paper plate (17), the pad II (6) is provided with a stepped through hole at the center position, the outer end of the stepped through hole corresponds to the fixed nut (11), and the inner end of the stepped through hole corresponds to the insulating screw rod (10), the pad III (7) is provided on the inner side of the pad II (6), the pad III (7) is provided with a through hole V corresponding to the insulating screw rod (10) at the center position, the pad III (7) is provided with a perforated paper plate II (4) on the inner side, the perforated paper plate II (4) is provided with a through hole VI corresponding to the insulating screw rod (10), the pad IV (8) is provided on the inner side of the perforated paper plate II (4), the pad IV (8) is provided with a through hole VII corresponding to the insulating screw rod (10) at the center position, and the insulating nut II (13) and the insulating nut I (9) are screwed on the other end of the insulating screw rod (10).

4. The low-noise EHV shunt reactor of claim 3, wherein, The fixed nut (11) is made of stainless steel, the insulating screw rod (10) is made of M20 glass fiber screw rod, the insulating nut II (13) and the insulating nut I (9) are made of M20 glass fiber nut, the rubber plate (16) is made of shock-absorbing and noise-reducing special rubber pad, and the non-absorbing hole paper plate (17), the perforated paper plate I (18) and the perforated paper plate II (4) are all made of insulating paper plate.

5. The low-noise EHV shunt reactor according to claims 2-4, characterized in that, The rubber plate (16), the non-absorbing hole paper plate (17), the perforated paper plate I (18) and the perforated paper plate II (4) are all made of whole plate bending processing into U-shaped structure.

6. The low-noise EHV shunt reactor of claim 1, wherein, The circumference of the open side is greater than that of the closed side plate.

7. The low-noise EHV shunt reactor of claim 6, wherein, The reinforcing iron shell (20) is made of low alloy steel plate.

8. The low-noise EHV shunt reactor of claim 7, wherein, The long strip pressing plate (19) is made of low alloy steel plate.

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