CN105244150B - A kind of converter power transformer noise reduction ventilation cooling device - Google Patents
A kind of converter power transformer noise reduction ventilation cooling device Download PDFInfo
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- CN105244150B CN105244150B CN201510721915.6A CN201510721915A CN105244150B CN 105244150 B CN105244150 B CN 105244150B CN 201510721915 A CN201510721915 A CN 201510721915A CN 105244150 B CN105244150 B CN 105244150B
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- 238000009423 ventilation Methods 0.000 title claims abstract description 55
- 230000009467 reduction Effects 0.000 title claims abstract description 42
- 238000001816 cooling Methods 0.000 title claims abstract description 31
- 230000004888 barrier function Effects 0.000 claims abstract description 39
- 239000011248 coating agent Substances 0.000 claims description 17
- 238000000576 coating method Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 10
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- DNIAPMSPPWPWGF-UHFFFAOYSA-N monopropylene glycol Natural products CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 4
- VBICKXHEKHSIBG-UHFFFAOYSA-N 1-monostearoylglycerol Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(O)CO VBICKXHEKHSIBG-UHFFFAOYSA-N 0.000 claims description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 claims description 3
- 239000004113 Sepiolite Substances 0.000 claims description 3
- 229920002472 Starch Polymers 0.000 claims description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 3
- 229910021536 Zeolite Inorganic materials 0.000 claims description 3
- SATJMZAWJRWBRX-UHFFFAOYSA-N azane;decanedioic acid Chemical compound [NH4+].[NH4+].[O-]C(=O)CCCCCCCCC([O-])=O SATJMZAWJRWBRX-UHFFFAOYSA-N 0.000 claims description 3
- 239000004202 carbamide Substances 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 3
- 239000004927 clay Substances 0.000 claims description 3
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- -1 propylene glycol ester Chemical class 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 229910052624 sepiolite Inorganic materials 0.000 claims description 3
- 235000019355 sepiolite Nutrition 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- 239000008107 starch Substances 0.000 claims description 3
- 235000019698 starch Nutrition 0.000 claims description 3
- 238000010792 warming Methods 0.000 claims description 3
- 239000010457 zeolite Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 2
- 240000005528 Arctium lappa Species 0.000 claims 1
- 239000000835 fiber Substances 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
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- Regulation Of General Use Transformers (AREA)
- Casings For Electric Apparatus (AREA)
Abstract
The invention discloses a kind of converter power transformer noise reduction ventilation cooling device, including the hollow blimp being made up of internal layer noise barrier and outer layer noise barrier, it is spatial joint clearance between internal layer noise barrier and outer layer noise barrier, the side upper end of outer layer noise barrier is provided with ventilation intake, opposite side upper end corresponding thereto is provided with draft outlet；With ventilation intake and the lower end of draft outlet respective side on internal layer noise barrier, it is correspondingly arranged on the first ventilating opening and the second ventilating opening, dividing plate is provided with the spatial joint clearance of first ventilating opening and the second ventilating opening respectively between ventilation intake and draft outlet, dividing plate separates the spatial joint clearance between the first ventilating opening and ventilation intake and the second ventilating opening and draft outlet, and through hole is provided with dividing plate.The converter power transformer noise reduction ventilation cooling device that the present invention is provided has reached good ventilation noise reduction by reasonably designing.
Description
Technical field
The invention belongs to electrical equipment field of noise control, and in particular to a kind of converter power transformer noise reduction ventilating and cooling dress
Put.
Background technology
Converter power transformer is vital key equipment in super high voltage direct current electricity transmission engineering, is AC and DC transmission system
In the change of current, the nucleus equipment of the end interface of inversion two.Its input and safe operation be engineering obtain power benefit key and
Important guarantee.The key effect of converter power transformer, it is desirable to which it has high reliability and high-tech performance.Because there is AC DC electric
Field, the collective effect in magnetic field, so the structure of converter power transformer is special, complexity, key technology is high-leveled and difficult, to manufacturing environment and processing
Quality requirement is strict.Carry out converter power transformer manufacture and design the research of key technology, capture with manufacturing condition retrofit work, constantly
Research technique is improved, is beneficial to grasp the design and manufacturing technology of converter power transformer comprehensively, realizes that converter power transformer domesticizes, fill out
Mend domestic blank.The further raising and development of domestic AC and DC transmission facility designing and manufacturing level can be promoted simultaneously, be extra-high
The development of pressure AC and DC power transmission and transforming equipment lays the first stone, and carries out early-stage preparations, realizes that converter power transformer domesticizes.
Converter power transformer in the process of running, because noise is larger, therefore can be dirty to around producing more serious noise
Dye, it is therefore desirable to be controlled to the noise that it sends.Conventional control mode is Barrier method at present, and it is before converter power transformer
Or install an acoustic barrier between converter power transformer body and cooler additional, but its effect is limited, while in limited confined air
The heat of interior operation machine in itself is difficult to distribute, therefore can gather heat for a long time to produce not the operation of equipment
The influence of profit, it is therefore desirable to design it is a kind of noise reduction while can be good at can either play the device that ventilating and cooling is acted on very well,
Ensure the good operation of equipment while fine noise reduction.
The content of the invention
A kind of converter power transformer noise reduction ventilation is provided the invention aims to overcome above the deficiencies in the prior art
Cooling device, can radiate while can effectively reduce converter power transformer noise to it, preferably ensure equipment
Operation.
Technical scheme is as follows：
A kind of converter power transformer noise reduction ventilation cooling device, including be made up of internal layer noise barrier and outer layer noise barrier
Hollow blimp, is spatial joint clearance between internal layer noise barrier and outer layer noise barrier, in the side upper end of outer layer noise barrier
Ventilation intake is provided with, opposite side upper end corresponding thereto is provided with draft outlet；With ventilation intake on internal layer noise barrier
With the lower end of draft outlet respective side, the first ventilating opening and the second ventilating opening, the first ventilating opening and the second ventilation are correspondingly arranged on
Be provided with dividing plate in mouth spatial joint clearance respectively between ventilation intake and draft outlet, dividing plate by the first ventilating opening with divulge information into
Mouth and the spatial joint clearance between the second ventilating opening and draft outlet are separated, and through hole is provided with dividing plate.
Described converter power transformer noise reduction ventilation cooling device, the material of the outer layer noise barrier and internal layer noise barrier
Can be glass or cement.
Described converter power transformer noise reduction ventilation cooling device, dividing plate sets quantity to be more than one.
The aperture of through hole can be 4-6mm on described converter power transformer noise reduction ventilation cooling device, dividing plate.
The punching rate of through hole can be 60-70% on described converter power transformer noise reduction ventilation cooling device, dividing plate.
Sound deadening coating can be coated with described converter power transformer noise reduction ventilation cooling device, internal layer noise barrier.
Sound deadening coating can be coated with described converter power transformer noise reduction ventilation cooling device, dividing plate.
Above-described converter power transformer noise reduction ventilation cooling device, the sound deadening coating can be according to following steps system
It is standby：
Step 1, by 2 parts of zeolite powder in parts by weight, 5 parts of clay powder, 8 parts of sepiolite, 10 parts of propylene glycol ester, acrylic acid
3 parts, 3 parts of glycerin monostearate, which is added in mixing and blending machine, to be uniformly mixed, and obtains mixed material；
Step 2, mixed material is added in reactor, 5 parts of azobis-dimethylvaleronitrile of addition, 5 parts of sodium carboxymethyl starch,
7 parts of glass fibre, is heated to 60 DEG C, stirs 20 minutes, is then warming up to 80 DEG C under conditions of nitrogen protection, continues to stir 15
Minute, room temperature is down to, intermediate one is obtained；
Step 3, intermediate one is heated to 40 DEG C under conditions of vacuum is 0.02MPa, in 1000 revs/min of bar
Stirred under part 10 minutes, then stirred 20 minutes under conditions of with 500 revs/min, be down to room temperature, obtain intermediate two；
Step 4,30 parts of ethyl acetate is added in intermediate two, 5 parts of silica is well mixed, obtains sound deadening coating.
Described converter power transformer noise reduction ventilation cooling device, is heated to before 60 DEG C in step 2, can also add with weight
Measure 6 parts of 3 parts of the ammonium sebacate of part meter, 1 part of ethylenediamine and urea.
The converter power transformer noise reduction ventilation cooling device that the present invention is provided is by designing the ventilation intake of correct position, divulging information
Outlet, ventilating opening and dividing plate, have reached good ventilation noise reduction；The sound deadening coating provided by using the present invention, more
The effect of noise reduction is further reached.
Brief description of the drawings
Fig. 1 be the embodiment of the present invention 1 in converter power transformer noise reduction ventilation cooling device schematic diagram, wherein 1 be internal layer every
Sound barrier, 2 be outer layer noise barrier, and 3 be ventilation intake, and 4 be draft outlet, and 5 be dividing plate, and 6 be the first ventilating opening, and 7 be second
Ventilating opening, 8 be converter power transformer.
Embodiment
Embodiment 1
As shown in figure 1, for converter power transformer noise reduction ventilation cooling device schematic diagram of the present invention, including by internal layer every
The hollow blimp that sound barrier 1 and outer layer noise barrier 2 are constituted, is space between internal layer noise barrier 1 and outer layer noise barrier 2
Gap, ventilation intake 3 is provided with the side upper end of outer layer noise barrier 2, and opposite side upper end corresponding thereto is provided with ventilation
Outlet 4；With ventilation intake 3 and the lower end of the respective side of draft outlet 4 on internal layer noise barrier 1, the first ventilation is correspondingly arranged on
The ventilating opening 7 of mouth 6 and second, the space of the first ventilating opening 6 and the second ventilating opening 7 respectively between ventilation intake 3 and draft outlet 4
Dividing plate 5 is provided with gap, dividing plate 5 is by between the first ventilating opening 6 and the ventilating opening 7 of ventilation intake 3 and second and draft outlet 4
Spatial joint clearance separate, be provided with through hole on dividing plate 5.The hollow blimp being made up of in the present embodiment two layers of noise barrier reaches
Arrive effective noise reduction, the material of outer layer noise barrier 2 and internal layer noise barrier 1 can be the materials such as glass or cement,
Soundproof effect can be functioned well as；Set dividing plate 5 to function well as the effect for crossing noise filtering, enable in ventilation process
Noise inside leakage as small as possible, dividing plate 5 sets more than one, can further function as the effect of noise filtering.To logical
The diverse location of wind entrance 3, draft outlet 4, the first ventilating opening 6 and the second ventilating opening 7 sets and has functioned well as inner air
The effect of circulation, can preferably play cooling effect.
Embodiment 2
The present embodiment is that the aperture of through hole on the further improvement on the basis of embodiment 1, its median septum 5 is 4-6mm, every
The punching rate of through hole is 60-70% on plate 5, and the purpose so set is that the condition of available ventilation can be ensured to greatest extent
It is lower to cross noise filtering, show by detection, using the set-up mode of the present embodiment, drafting efficiency is to be not provided with dividing plate ventilation rate
More than 91%, and noise percent of pass then have decreased to % within 38.
Embodiment 3
The present embodiment is the further improvement on the basis of embodiment 2, wherein being sprayed on internal layer noise barrier 1 and dividing plate 5
Commercially available sound deadening coating is applied, by this way, the converter power transformer noise reduction ventilation cooling device that the present embodiment is provided is applied to
The converter power transformer of ± 800kV power, its noise reduction rate in embodiment 2 compared to improving more than 20%.
Embodiment 4
The present embodiment is the further improvement carried out on the basis of embodiment 3, wherein described sound deadening coating is this hair
The coating of bright designed, designed, its specific preparation method is as follows：
Step 1, by 2 parts of zeolite powder in parts by weight, 5 parts of clay powder, 8 parts of sepiolite, 10 parts of propylene glycol ester, acrylic acid
3 parts, 3 parts of glycerin monostearate, which is added in mixing and blending machine, to be uniformly mixed, and obtains mixed material；
Step 2, mixed material is added in reactor, 5 parts of azobis-dimethylvaleronitrile of addition, 5 parts of sodium carboxymethyl starch,
7 parts of glass fibre, is heated to 60 DEG C, stirs 20 minutes, is then warming up to 80 DEG C under conditions of nitrogen protection, continues to stir 15
Minute, room temperature is down to, intermediate one is obtained；
Step 3, intermediate one is heated to 40 DEG C under conditions of vacuum is 0.02MPa, in 1000 revs/min of bar
Stirred under part 10 minutes, then stirred 20 minutes under conditions of with 500 revs/min, be down to room temperature, obtain intermediate two；
Step 4,30 parts of ethyl acetate is added in intermediate two, 5 parts of silica is well mixed, obtains sound deadening coating.
Sprayed by using obtained volume sound deadening coating made above on internal layer noise barrier 1 and dividing plate 5, film
Thickness is 4-6mm, after measured, and the noise reduction rate of whole converter power transformer noise reduction ventilation cooling device is commercially available with being used in embodiment 3
Sound deadening coating has reached more than 85.8% compared to improving more than 15%.The specific formula for calculation of noise reduction rate is as follows：
Noise reduction rate（%）=1-（The noise ration determined before the noise ration/noise reduction determined after noise reduction）×100%
Embodiment 5
The present embodiment is the further improvement carried out on the basis of embodiment 4, and the preparation process of wherein sound deadening coating exists
It is heated in step 2 before 60 DEG C, is additionally added 3 parts of ammonium sebacate in parts by weight, 1 part of ethylenediamine and 6 parts of urea, other steps
It is identical with preparation process in embodiment 4.Spraying same as Example 4 is carried out to the sound deadening coating that the present embodiment is provided, then
Its noise reduction rate is determined, is as a result shown, the noise reduction rate of device has reached more than 93.6%, further demonstrates the superior of the present embodiment
Property.
For the Design of ventilation that provides of the present invention, after testing, the first ventilating opening 6 and the second ventilating opening 7 respectively with ventilation
In spatial joint clearance between entrance 3 and draft outlet 4 above and below each setting during two pieces of dividing plates（Such as Fig. 1）, drafting efficiency is to be not provided with
More than 90% during dividing plate, and noise percent of pass then have decreased within 22%.Therefore, the scheme that the present invention is provided can be well
Ensure greatly to reduce the noise pollution of equipment in the case of ventilating and cooling.
Claims (8)
1. a kind of converter power transformer noise reduction ventilation cooling device, it is characterised in that including by internal layer noise barrier（1）With outer layer every
Sound barrier（2）The hollow blimp of composition, internal layer noise barrier（1）With outer layer noise barrier（2）Between be spatial joint clearance, outside
Layer noise barrier（2）Side upper end be provided with ventilation intake（3）, opposite side upper end corresponding thereto is provided with draft outlet
（4）；In internal layer noise barrier（1）Upper and ventilation intake（3）And draft outlet（4）The lower end of respective side, is correspondingly arranged on first
Ventilating opening（6）With the second ventilating opening（7）, the first ventilating opening（6）With the second ventilating opening（7）Respectively with ventilation intake（3）And ventilation
Outlet（4）Between spatial joint clearance in be provided with dividing plate（5）, dividing plate（5）By the first ventilating opening（6）With ventilation intake（3）And
Second ventilating opening（7）With draft outlet（4）Between spatial joint clearance separate, dividing plate（5）On be provided with through hole.
2. converter power transformer noise reduction ventilation cooling device according to claim 1, it is characterised in that the outer layer gobo
Barrier（2）With internal layer noise barrier（1）Material be glass or cement.
3. converter power transformer noise reduction ventilation cooling device according to claim 1, it is characterised in that dividing plate（5）Upper through hole
Aperture be 4-6mm.
4. converter power transformer noise reduction ventilation cooling device according to claim 1, it is characterised in that dividing plate（5）Upper through hole
Punching rate be 60-70%.
5. converter power transformer noise reduction ventilation cooling device according to claim 1, it is characterised in that internal layer noise barrier
（1）On be coated with sound deadening coating.
6. converter power transformer noise reduction ventilation cooling device according to claim 1, it is characterised in that dividing plate（5）Upper spraying
There is sound deadening coating.
7. converter power transformer noise reduction ventilation cooling device according to claim 6, it is characterised in that the sound deadening coating is pressed
Prepared according to following steps：
Step 1, by 2 parts of zeolite powder in parts by weight, 5 parts of clay powder, 8 parts of sepiolite, 10 parts of propylene glycol ester, 3 parts of acrylic acid,
3 parts of glycerin monostearate, which is added in mixing and blending machine, to be uniformly mixed, and obtains mixed material；
Step 2, mixed material is added in reactor, adds 5 parts of azobis-dimethylvaleronitrile, 5 parts of sodium carboxymethyl starch, glass
7 parts of fiber, is heated to 60 DEG C, stirs 20 minutes, is then warming up to 80 DEG C under conditions of nitrogen protection, continues to stir 15 points
Clock, is down to room temperature, obtains intermediate one；
Step 3, intermediate one is heated to 40 DEG C under conditions of vacuum is 0.02MPa, under conditions of 1000 revs/min
Stirring 10 minutes, is then stirred 20 minutes under conditions of with 500 revs/min, is down to room temperature, obtains intermediate two；
Step 4,30 parts of ethyl acetate is added in intermediate two, 5 parts of silica is well mixed, obtains sound deadening coating.
8. converter power transformer noise reduction ventilation cooling device according to claim 7, it is characterised in that heat in step 2
To before 60 DEG C, 6 parts of 3 parts of ammonium sebacate in parts by weight, 1 part of ethylenediamine and urea are additionally added.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510721915.6A CN105244150B (en) | 2015-10-30 | 2015-10-30 | A kind of converter power transformer noise reduction ventilation cooling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510721915.6A CN105244150B (en) | 2015-10-30 | 2015-10-30 | A kind of converter power transformer noise reduction ventilation cooling device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105244150A CN105244150A (en) | 2016-01-13 |
| CN105244150B true CN105244150B (en) | 2017-08-11 |
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| CN201510721915.6A Expired - Fee Related CN105244150B (en) | 2015-10-30 | 2015-10-30 | A kind of converter power transformer noise reduction ventilation cooling device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109024947A (en) * | 2018-07-20 | 2018-12-18 | 国网山西省电力公司电力科学研究院 | The sound barrier device of for transformer reducing fan noise |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106652990B (en) * | 2017-02-21 | 2024-02-27 | 湖州浩森科技股份有限公司 | Industrial small-size sound-proof housing device |
| CN107333455B (en) * | 2017-08-17 | 2023-09-12 | 上海电力设计院有限公司 | Ventilating trench and isolation device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201194191Y (en) * | 2008-03-07 | 2009-02-11 | 国家电网公司 | Ventilation refrigerating apparatus for enclosed mounting space of current converting transformer |
| CN102022013A (en) * | 2010-11-05 | 2011-04-20 | 江苏省电力设计院 | Noise reduction structure of main noise resources of urban indoor substation |
| CN202839218U (en) * | 2012-08-27 | 2013-03-27 | 伊川县电业局 | Transformer noise reduction box |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013021035A (en) * | 2011-07-08 | 2013-01-31 | Mitsubishi Electric Corp | Noise reduction structure for transformer |
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2015
- 2015-10-30 CN CN201510721915.6A patent/CN105244150B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201194191Y (en) * | 2008-03-07 | 2009-02-11 | 国家电网公司 | Ventilation refrigerating apparatus for enclosed mounting space of current converting transformer |
| CN102022013A (en) * | 2010-11-05 | 2011-04-20 | 江苏省电力设计院 | Noise reduction structure of main noise resources of urban indoor substation |
| CN202839218U (en) * | 2012-08-27 | 2013-03-27 | 伊川县电业局 | Transformer noise reduction box |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109024947A (en) * | 2018-07-20 | 2018-12-18 | 国网山西省电力公司电力科学研究院 | The sound barrier device of for transformer reducing fan noise |
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| CN105244150A (en) | 2016-01-13 |
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