CN108074715A - A kind of oil-immersed transformer - Google Patents
A kind of oil-immersed transformer Download PDFInfo
- Publication number
- CN108074715A CN108074715A CN201610986888.XA CN201610986888A CN108074715A CN 108074715 A CN108074715 A CN 108074715A CN 201610986888 A CN201610986888 A CN 201610986888A CN 108074715 A CN108074715 A CN 108074715A
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- China
- Prior art keywords
- fuel tank
- oil
- transformer
- coil
- immersed transformer
- Prior art date
- Legal status (The legal status 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 status listed.)
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
- H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
- H01F27/292—Surface mounted devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
The invention discloses a kind of oil-immersed transformers.The present invention provides a kind of oil-immersed transformer, and the oil-immersed transformer includes：Fuel tank, fuel tank are used to take up transformer oil；Transformer core and coil are arranged in the fuel tank；Conservator is configured above the fuel tank；And radiator, it configures in the side of the fuel tank, wherein, the fuel tank is made at least partly with insulating materials, and the outlet terminal of the coil is arranged at the insulating materials.In the oil-immersed transformer of the present invention, fuel tank is made at least partly with insulating materials, and outlet terminal is arranged at insulating materials, the problem of so as to well solve insulating sleeve high failure rate.
Description
Technical field
The present invention relates to transformer technology field, more particularly to a kind of oil-immersed transformer.
Background technology
Transformer is one of important equipment in industrial and mining enterprises and electric system, and in high voltage substation, transformer is normal
As buck/boost etc., for the transformer of voltage levels, common form is oil-immersed transformer.
Transformer is the critical elements in electric system.The voltage that generator is sent is limited impossible by its insulation conditions
It is too high, generally 6.3~27kV or so.To the high-power power sent is directly sent to far electricity consumption area, it need to use and rise
Pressure transformer is raised to the terminal voltage of generator higher transmission voltage.After electric energy is sent to electricity consumption area, downconverter is also used
Transmission voltage is reduced to distribution voltage by device, is then then sent through each electricity consumption subregion, finally voltage is dropped to through distribution transformer again
The required voltage class of user, for users to use.Sometimes in order to the electric system of two different voltages grades is joined each other
System gets up, and usually uses three-winding transformer.In addition, the safety in order to ensure electricity consumption and the voltage request in accordance with electricity consumption device,
The transformer of also various special purposes, if auto-transformer, mutual inductor, isolating transformer and various dedicated transformers are (as used
In the transformer of electric welding, electric furnace etc.) etc..It can be seen that the purposes of transformer is very extensive.
In the oil-immersed transformer of the prior art, the lead (especially high-voltage connection) of transformer coil is worn out of fuel tank
When crossing fuel tank cap, since fuel tank is made of metal, so must be provided with insulating sleeve, the lead passes through the insulation sleeve
Pipe, so that insulating between high-voltage connection and the fuel tank of ground connection.The insulating sleeve of high voltage is all to use capacitor type insulating casing,
Middle pressure can also use pure porcelain casing tube or epoxy bushing.
The operating condition of insulating sleeve is more severe, so that than more prominent the problem of insulating sleeve, high failure rate, electricity
Pressure is more high such.Further, since fuel tank is metallic ground in itself, electric field design and insulating Design ratio at coil high pressure
It is more complicated, and cost can be increased.Meanwhile for high voltage transformer, traditional metallic oil tank is generally all very big, and welding point compares
It is more, and technological requirement is high, it is actual among there is leakage and be nearly unavoidable, easily bring make moist, the other problems such as oil starvation,
And the processing of its breakthrough is also very troublesome.In addition, the internal physical defect of transformer is also to be difficult to be sent out in outside
Existing, so that hidden danger accumulation causes significant trouble.
Thus, it is desirable to have a kind of oil-immersed transformer come in the drawbacks described above that overcomes or at least mitigate the prior art at least
One.
The content of the invention
It is lacked it is an object of the invention to provide a kind of oil-immersed transformer to overcome or at least mitigate the above-mentioned of the prior art
It is at least one in falling into.
To achieve the above object, the present invention provides a kind of oil-immersed transformer, and the oil-immersed transformer includes：
Fuel tank, fuel tank are used to take up transformer oil；And
Transformer core and coil are arranged in the fuel tank；
Conservator is configured above the fuel tank；And
Radiator is configured in the side of the fuel tank,
Wherein, the fuel tank is made at least partly with insulating materials, the outlet terminal of the coil be arranged on it is described absolutely
At edge material.
Preferably, the outlet terminal is directly embedded in the insulating materials.
Preferably, the coil includes low-voltage coil and/or intermediate voltage winding and high-tension coil, wherein the low-voltage coil
And/or the outlet terminal of intermediate voltage winding is drawn by the insulating sleeve being arranged on fuel tank；The outlet terminal of the high-tension coil
It is directly embedded in the insulating materials.
Preferably, the insulating materials is epoxy resin impregnated glass fiber, SMC, DMC, ABS engineering plastics, poly- carbonic acid
Ester or acrylic plastics.
Preferably, the fuel tank is entirety with insulation shell made of insulating materials.
Preferably, the top of the fuel tank is insulated part, and bottom is metal material.
Preferably, the fuel tank includes metal cabinet and the insulation cover for being arranged on the babinet top.
Preferably, it is provided with anti-explosion groove at the insulating materials of the fuel tank.
Preferably, the conservator is all insulation, and is combined together with the insulation shell；Or
The conservator is made with metal material, and by being connected with the second connecting pipe made of insulating materials and the fuel tank
It is logical.
Preferably, the insulating materials is to be provided with transparent watch window on transparent material or the fuel tank.
Preferably, the spatial altitude between the head cover of the coil top and the fuel tank is not more than 200mm；Or less
In the numerical value of the field strength allowable of the voltage divided by transformer oil of the coil.
In the oil-immersed transformer of the present invention, fuel tank is made at least partly with insulating materials, and outlet terminal is arranged on
At insulating materials, the problem of so as to well solve insulating sleeve high failure rate.
Advantages of the present invention is as follows.
1st, fuel tank is made at least partly with insulating materials, and outlet terminal is arranged at insulating materials, can be gone completely
Fall insulating sleeve or greatly reduce the requirement of insulating sleeve, so as to well solve insulating sleeve high failure rate
Problem.
2nd, fuel tank all adopt be made from an insulative material or its high potential near fuel tank adopt and be made from an insulative material, become
The electric field design and insulating Design of depressor can be simply easily very much, especially even more so to high voltage transformer, transformer
Safety and reliability can also greatly improve.
3rd, fuel tank made of insulating materials need not have solder joint, can also generally do integral, the possibility of leakage
It drastically reduces, meanwhile, even if leaking, processing is also much easier, and the reliability of transformer can increase substantially.
4th, it is former exhausted due to that can cancel insulating sleeve or significantly reduce the technology requirement of insulating sleeve in traditional structure
The part that edge casing enters fuel tank can greatly reduce or even cancel, so, top of oil-tank space can be substantially reduced, greatly
The dosage of insulating oil is filled in big reduction, cost can greatly reduce.
Description of the drawings
Fig. 1 is the schematic diagram of oil-immersed transformer according to an embodiment of the invention.
Reference numeral：
| 1 | Iron core | 7 | Low-voltage coil outlet terminal |
| 2 | High-tension coil | 8 | Radiator |
| 3 | Low-voltage coil | 9 | First connecting pipe |
| 4 | Fuel tank | 10 | Conservator |
| 5 | Insulating oil | 11 | Second connecting pipe |
| 6 | The outlet terminal of high-tension coil |
Specific embodiment
In the accompanying drawings, represent same or similar element using same or similar label or have the function of same or like
Element.The embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.
In the description of the present invention, term " " center ", " longitudinal direction ", " transverse direction ", "front", "rear", "left", "right", " vertical ",
The orientation or position relationship of the instructions such as " level ", " top ", " bottom " " interior ", " outer " are to be closed based on orientation shown in the drawings or position
System is for only for ease of the description present invention and simplifies description rather than instruction or imply that signified device or element must have
Specific orientation, with specific azimuth configuration and operation, therefore it is not intended that limiting the scope of the invention.
The main member of oil-immersed transformer is fuel tank, iron core, coil (containing high-tension coil, low-voltage coil, some transformers
Be additionally provided with intermediate voltage winding), insulating sleeve, conservator, radiator, interior fill insulating oil and other attachmentes.The line of oil-immersed transformer
Circle and iron core are positioned in fuel tank, and are immersed in the insulating oil filled in oil tank of transformer.In the prior art, the outlet of coil
It is to be drawn using the insulating sleeve being installed on fuel tank；The fuel tank of the present invention is made at least partly with insulating materials, so as to
To omit insulating sleeve.Conservator is higher than fuel tank, and general to be provided with explosion-protection equipment simultaneously, radiator is generally disposed at oil tank of transformer
Side.
Iron core constitutes the magnetic circuit of transformer, while is the skeleton for being set with winding again.Iron core is divided into iron core column and iron yoke two
Part.Winding is covered in iron core column, iron yoke connects iron core column to form closed magnetic circuit.In order to reduce the magnetic hysteresis in iron core, whirlpool
Stream loss, improves the magnetic property of magnetic circuit, iron core is generally with the magnetic material of high magnetic permeability --- and silicon steel sheet closed assembly forms.
Coil is the circuit part of transformer, it is usually formed by copper or aluminum conductor coiling.The primary winding of transformer is defeated
Enter electric energy, secondary coil output electric energy, they are usually sleeved on same stem.Primary and secondary coil has different circles
Number, is acted on by electromagnetic induction, and the electric energy of primary winding can be for delivery to secondary coil, and first and second coil is made to have not
Same voltage and current.The higher coil of voltage is called high-tension coil, voltage it is relatively low be just called low-voltage coil.It will according to using
It asks, some transformers are also configured with intermediate voltage winding.
The transformer body of iron core and coil composition, full of transformer oil in fuel tank, also has using silicone oil in fuel tank,
Or other insulating oils.Transformer oil is a kind of mineral oil, has good insulation performance, plays two：First, in transformation
Insulating effect is played between device winding and winding, winding and iron core and fuel tank；Second is that transformer oil generates convection current after being heated, to transformation
Device iron core and winding play cooling effect.■
Fuel tank side is configured with radiator, with increasing heat radiation area.In order to accelerate to radiate, in some high-power transformer uses
Portion's oil pump forced oil-circulation, external to be dried with transformer fan or with tap water shower oil tank of transformer etc., these are all oil immersions
The type of cooling of formula transformer.
Conservator (also referred to as oil conservater) is normally at the top of fuel tank, has oil pipe and fuel tank to communicate.When the body of transformer oil
When product changes with oil temperature and expands diminution, conservator plays a part of oil storage and repairing.Membrane or capsule are also equipped in some conservators
Or metal expansion box, it prevents oil and air contact and is aoxidized and made moist.Equipped with oil ga(u)ge pipe on conservator, to observe the change of oil level
Change.Conservator lower part is equipped with mud collector, and effect is to collect mechanical admixture, greasy filth and the moisture to precipitate in oil.Under mud collector
Portion is equipped with sewage draining valve.The volume of general conservator is the 1/10 of oil tank of transformer.
In the prior art, for high voltage transformer, fuel tank is generally all very big, and welding point is relatively more, and technological requirement
Height occurs leakage in practical application and is nearly unavoidable, easily bring make moist, the other problems such as oil starvation, and it is leaked
The processing of point is also very troublesome.In addition, the internal physical defect of transformer is also to be difficult to be found in outside, so that
It obtains hidden danger accumulation and causes significant trouble.
The transformer shown in Fig. 1 be three-phase two-winding transformer, it should be noted however that it is suitable for its
The transformer of his type.In Fig. 1, iron core 1 uses the iron core of most common three-phase five-limb.High-tension coil 2 is typically placed at
Outside low-voltage coil 3.Transformer is three-phase transformer in figure, high-tension coil 2 and low-voltage coil 3 all there are three, per phase one, all
It is positioned within fuel tank 4.Gap section filling insulating oil 5 in fuel tank.
Fuel tank 4 is whole to adopt that either its upper part is made from an insulative material is using insulating materials or only local using insulation
Material is made.In one embodiment, fuel tank 4 is entirety with insulation shell made of insulating materials.In an alternative embodiment
In, the top of fuel tank 4 is insulated part, and bottom is metal material.In another alternative embodiment, fuel tank 4 includes metal box
Body and the insulation cover for being arranged on the babinet top.Insulate the generally planar shape of cover, is sealingly disposed in metal cabinet
On.
Advantageously, the outlet terminal of all coils passes through fuel tank 4 at insulating materials.It is but it is also possible to only high
The outlet terminal 6 of crimping circle passes through at insulating materials.
The insulating materials can be epoxy resin impregnated glass fiber, SMC, DMC, ABS engineering plastics, makrolon and
One or more in acrylic plastics.
Advantageously, whole adopt of fuel tank 4 is made from an insulative material.Entirety can be molded with fuel tank made of insulating materials
Shaping, so as to remove necessary solder joint in metallic oil tank completely.The possibility of leakage drastically reduces, meanwhile, even if leaking,
Its processing is also much easier, and the reliability of transformer can increase substantially.
Advantageously, it is provided with anti-explosion groove at the insulating materials of fuel tank.The Explosion-proof Design of traditional transformer is often set
The explosion-proof setting of specialty is put, structure is complex.And when using insulating materials, it (is commonly called as with epoxy resin impregnated glass fiber：Glass
Glass steel) exemplified by, it can very easy processing sets up anti-explosion groove on it.And highly developed technology.It for example, can be exhausted
Setting position processes rectangular channel on edge material, mechanical strength of the housing in this part is reduced, to reach explosion-proof mesh
's.
In a preferred embodiment, the fuel tank that transparent insulating materials is selected to make.Consequently facilitating observation oil immersion
The inner case of formula transformer, to find physical defect that interior visible is shown in.It is understood that by being set on fuel tank 4
Transparent local watch window is put, can also realize identical technique effect.
In Fig. 1, the outlet terminal 6 of high-tension coil and the outlet terminal 7 of low-voltage coil may be contained on fuel tank, set
At insulating materials.As needed, intermediate voltage winding and corresponding outlet terminal, and the outlet terminal of intermediate voltage winding can also be set
It is also disposed at insulating materials.
Radiator 8 is arranged at the outside of fuel tank 4, in the illustrated embodiment, is both provided at the left and right sides of fuel tank 4 scattered
Hot device 8.There is the first connecting pipe 9 between radiator 8 and fuel tank 4.First connecting pipe 9 can be configured according to electric field distribution situation
For the either metal or SI semi-insulation of insulation.
Conservator 10 is located at 4 top of fuel tank, is connected by the second connecting pipe 11 with fuel tank 4.Advantageously, conservator 10 and
Two connecting pipes 11 are insulation, so as to which its position can flexibly be set.If conservator 10 is metal, need considering electricity
Its position is determined after field distribution, and the second connecting pipe should be insulation or SI semi-insulation at this time.
It is understood that other attachmentes of oil-immersed transformer are according to actual needs, with reference to the integral arrangement of transformer
It is configured with electric field distribution situation.
In the illustrated embodiment, outlet terminal is embedded in the insulating materials of fuel tank.That is, outlet terminal is straight
It connects and is embedded in the insulating materials.It is understood that other modes can also be used to set, for example, through simplified exhausted
Edge casing draws or draws through the appropriate deformation of fuel tank and (such as be integrally formed on fuel tank and form prominent casing, had
Profit, casing are prominent to fuel tank outside) or the extraction of other form of terminal.Advantageously, the coil includes low-voltage line
Circle, intermediate voltage winding (being arranged as required to) and high-tension coil, wherein the outlet terminal of the low-voltage coil and/or intermediate voltage winding
It is drawn by the insulating sleeve being arranged on fuel tank or its outlet terminal is directly embedded in the insulating materials；The height
The outlet terminal of crimping circle is directly embedded in the insulating materials.Advantageously, above-mentioned low-voltage coil and/or intermediate voltage winding
The insulating sleeve that outlet terminal passes through is also disposed at insulating materials, so as to which the requirement to insulating sleeve substantially reduces.
After applying the present invention, following advantages can be realized.
Remove the insulating sleeve of transformer completely or greatly reduce the requirement of insulating sleeve, it might even be possible to reach thorough
Bottom prevents the failure problems of insulating sleeve.
Electric field design and insulating Design near at high pressure can be simply easily very much.
By removing insulating sleeve, eliminate insulating sleeve and stretch into occupied space in top of oil-tank, so as to fuel tank top
The volume in portion can be substantially reduced, and cost can also be greatly reduced.In a preferred embodiment of the invention, the coil top
Spatial altitude between the head cover of the fuel tank is not more than 200mm.
In another preferred embodiment of the present invention, the spatial altitude between the head cover of the coil top and the fuel tank
No more than the numerical value of the field strength allowable of the voltage divided by transformer oil of the coil.
For example, it is assumed that transformer is 110kV grades, the voltage (rated voltage) of its coil (high-tension coil) of general remark
It is 110kV.If the transformer oil used, the field strength requirements allowable under specified 110kV are 2kV/mm, are using skill of the present invention
In the case of art scheme, the spatial altitude between the head cover of the coil top and the fuel tank can be arranged to：It is not more than
55mm (i.e. 110kV/2kV/mm)；
And for industrial frequency withstand voltage, if the requirement is that 230kV, and it is 3kV/ to require the field strength allowable of transformer oil at this time
Mm, then minimum range is 230kV divided by 3kV/mm, that is, 76.67mm；
And for lightning impulse withstand voltage, if the requirement is that 550kV, and in such cases, the field allowable of transformer oil
By force for 8kV/mm, then minimum range is 550kV divided by 8kV/mm, that is, 68.75mm.
Then consider, it is possible to which it is 76.67mm to set minimum range.
And the space length of crude oil box top includes insulating sleeve insulated lengths dipped in oil, insulating sleeve end
Equal splenium part, conducting wire connect or enter the attachment of insulating sleeve and the distance between coil top and cannula tip, for
It is general to be at least up to for 110kV, even larger than 500mm.That is, without increasing the sky because of insulating sleeve
Between height, in other words without increase the total height and total measurement (volume) of fuel tank because of insulating sleeve.Thus, it is possible to greatly reduce transformation
The use of device oil, substantially reduces cost.
Using insulation fuel tank, especially monoblock type insulation fuel tank, there need not be solder joint, the possibility of leakage drastically reduces.
Even if leaking, processing is also much easier, and the reliability of transformer can increase substantially.
As needed, the fuel tank or transparent watch window is set that transparent insulating materials makes can be selected, so as to
Convenient for observing the physical defect visually seen of inside transformer.
It is last it is to be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations.This
The those of ordinary skill in field should be understood：It can modify to the technical solution recorded in foregoing embodiments or right
Which part technical characteristic carries out equivalent substitution；These modifications are replaced, and the essence of appropriate technical solution is not made to depart from this
Invent the spirit and scope of each embodiment technical solution.
Claims (11)
1. a kind of oil-immersed transformer, which is characterized in that including：
Fuel tank, fuel tank are used to take up transformer oil；And
Transformer core and coil are arranged in the fuel tank；
Conservator is configured above the fuel tank；And
Radiator is configured in the side of the fuel tank,
Wherein, the fuel tank is made at least partly with insulating materials, and the outlet terminal of the coil is arranged on the insulation material
At material.
2. oil-immersed transformer as described in claim 1, which is characterized in that the outlet terminal is directly embedded in the insulation
In material.
3. oil-immersed transformer as described in claim 1, which is characterized in that the coil includes low-voltage coil and/or middle pressure
Coil and high-tension coil, wherein the outlet terminal of the low-voltage coil and/or intermediate voltage winding is exhausted on fuel tank by being arranged on
Edge casing is drawn；The outlet terminal of the high-tension coil is directly embedded in the insulating materials.
4. oil-immersed transformer as described in claim 1, which is characterized in that the insulating materials impregnates glass for epoxy resin
Fiber, SMC, DMC, ABS engineering plastics, makrolon or acrylic plastics.
5. such as the oil-immersed transformer any one of claim 1-4, which is characterized in that the fuel tank is whole to insulate
Insulation shell made of material.
6. such as the oil-immersed transformer any one of claim 1-4, which is characterized in that the top of the fuel tank is insulation
Part, bottom are metal material.
7. such as the oil-immersed transformer any one of claim 1-4, which is characterized in that the fuel tank includes metal box
Body and the insulation cover for being arranged on the babinet top.
8. such as the oil-immersed transformer any one of claim 1-4, which is characterized in that in the insulation of the fuel tank
Anti-explosion groove is provided at material.
9. such as the oil-immersed transformer any one of claim 1-4, which is characterized in that the conservator is all insulation,
And it is combined together with the insulation shell；Or
The conservator is made with metal material, and by being connected with the second connecting pipe made of insulating materials with the fuel tank.
10. such as the oil-immersed transformer any one of claim 1-4, which is characterized in that the insulating materials is transparent
Transparent watch window is provided on material or the fuel tank.
11.Such as the oil-immersed transformer any one of claim 1,2,4, which is characterized in that the coil top and institute The spatial altitude stated between the head cover of fuel tank is not more than 200mm；Or the voltage no more than the coil divided by the transformer The numerical value of the field strength allowable of oil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610986888.XA CN108074715A (en) | 2016-11-10 | 2016-11-10 | A kind of oil-immersed transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610986888.XA CN108074715A (en) | 2016-11-10 | 2016-11-10 | A kind of oil-immersed transformer |
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| Publication Number | Publication Date |
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| CN108074715A true CN108074715A (en) | 2018-05-25 |
Family
ID=62153315
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610986888.XA Pending CN108074715A (en) | 2016-11-10 | 2016-11-10 | A kind of oil-immersed transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109378177A (en) * | 2018-12-06 | 2019-02-22 | 四川星脉电子科技有限责任公司 | Oil-immersed transformer |
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| CN201063277Y (en) * | 2007-05-28 | 2008-05-21 | 刘立忠 | Fiber reinforcement unsaturated polyester resin tank transformer |
| CN201307505Y (en) * | 2008-11-14 | 2009-09-09 | 上海沪光变压器有限公司 | Underground transformer |
| CN203536154U (en) * | 2013-11-26 | 2014-04-09 | 佛山市中研非晶科技股份有限公司 | Transformer with functions of water resistance, damp resistance and salt mist resistance |
| CN207038298U (en) * | 2016-11-10 | 2018-02-23 | 北京诺德威电力技术开发有限责任公司 | A kind of oil-filled transformer |
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2016
- 2016-11-10 CN CN201610986888.XA patent/CN108074715A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201063277Y (en) * | 2007-05-28 | 2008-05-21 | 刘立忠 | Fiber reinforcement unsaturated polyester resin tank transformer |
| CN201307505Y (en) * | 2008-11-14 | 2009-09-09 | 上海沪光变压器有限公司 | Underground transformer |
| CN203536154U (en) * | 2013-11-26 | 2014-04-09 | 佛山市中研非晶科技股份有限公司 | Transformer with functions of water resistance, damp resistance and salt mist resistance |
| CN207038298U (en) * | 2016-11-10 | 2018-02-23 | 北京诺德威电力技术开发有限责任公司 | A kind of oil-filled transformer |
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| CN109378177A (en) * | 2018-12-06 | 2019-02-22 | 四川星脉电子科技有限责任公司 | Oil-immersed transformer |
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Addressee: Beijing Nobbel Electric Tech Develop Co., Ltd. Document name: Notification of Publication of the Application for Invention |
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