CN108305766A - A kind of non-packed dry type power transformer - Google Patents
A kind of non-packed dry type power transformer Download PDFInfo
- Publication number
- CN108305766A CN108305766A CN201810070864.9A CN201810070864A CN108305766A CN 108305766 A CN108305766 A CN 108305766A CN 201810070864 A CN201810070864 A CN 201810070864A CN 108305766 A CN108305766 A CN 108305766A
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- China
- Prior art keywords
- type power
- polyester film
- aramid
- dry type
- winding
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- 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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/022—Non-woven fabric
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/10—Organic non-cellulose fibres
- D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H13/26—Polyamides; Polyimides
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
- D21H15/10—Composite fibres
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/30—Multi-ply
- D21H27/38—Multi-ply at least one of the sheets having a fibrous composition differing from that of other sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
- B32B2307/206—Insulating
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Textile Engineering (AREA)
- Organic Insulating Materials (AREA)
- Paper (AREA)
Abstract
The present invention provides a kind of non-packed dry type power transformers, upper fixing element including winding assembly, set on winding assembly top and the lower fixing piece set on winding assembly bottom end, winding assembly includes iron core, low pressure winding and high-voltage winding on iron core, insulating paper is equipped between low pressure winding and high-voltage winding, insulating paper includes double-layer structure：Nonwoven layer and high temperature resistance polyester film layer are not easy to be layered between nonwoven layer and high temperature resistance polyester film layer using jointing material bonding；Nonwoven layer includes 5 30wt% aramid fibrids, 60 80wt% aramid pulps and 10 15wt% aramid staple fibers.The non-packed dry type power transformer of the present invention, due to the dielectricity of jointing material and polyester film, jointly so that insulating paper reaches preferable insulation effect；Using the polyester film that surface is smooth, when being put into motor, reduces the friction between motor, ensure the work quality of motor.
Description
Technical field
The present invention relates to power transformer equipment technical field more particularly to a kind of non-packed dry type power transformers.
Background technology
Currently, the dry-type power transformer design of the prior art is unreasonable, insulation performance is poor, and loss is high, noise is big, ring
It is poor to protect effect, to affect the electric property and mechanical performance of transformer in use, shortens the use of transformer
Service life；Therefore, people will recognize that is added a kind of insulating paper in transformer, and the insulating capacity of transformer is improved with this；Insulation
Paper can be used as slot insulation, turn-to-turn and the layer insulation of middle and small motor, the liner insulation heart and transformer insulated.It sells on the market at present
Insulating paper level it is various, however multilayer insulation paper is mostly used greatly for the use of insulating paper in micromotor, such as：Three layers absolutely
Edge paper, four layers of insulating paper etc. are put into multilayer, waste material, and one layer of insulating paper cannot also meet since its insulation effect is poor
The demand of people.
Such as Chinese patent CN103325548A discloses a kind of non-packed dry type power transformer, including winding assembly,
Lower fixing piece set on the upper fixing element on the winding assembly top and set on the winding assembly bottom end, the winding assembly
Low pressure winding and high-voltage winding including iron core, on the iron core, are equipped between the low pressure winding and high-voltage winding
Nomex insulating papers, the low pressure winding and high-voltage winding are through H grades of solvent-free insulated paint vacuum pressure impregnations.Wherein, the technology
The Nomex insulating papers used in scheme are Conventional insulation paper used at present, also prodigious for insulation performance
Room for promotion.
Such as Chinese Patent Application No. discloses a kind of low noise dry-type transformer for 201410678408.4 again, installs bottom
There are three windings, the upper and lower ends of winding to be respectively arranged with upper clamping piece and lower clamping piece, the interior peace of lower clamping piece for installation side by side for the upper end of seat
Equipped with cooling blower, low-pressure line-outgoing copper bar and HV Terminal are installed on upper clamping piece, high-voltage tap head is provided on front side of winding, it is high
It is connected by high pressure connecting rod between pressure side and winding, the lower end of mounting seat is installed with array by bolt assembly and subtracts
Device is shaken, the lower end of damper is installed with iron plate, and iron plate lower end is installed with rubber shock-absorbing cushion block.The technical solution increases
Sound-absorbing material reduces noise when transformer work, however for insulation performance, do not carry out great change
It is kind.
Invention content
To overcome insulating paper use cost existing in the prior art big, insulation performance does not protrude and not tender practical joke takes into account
The problem of improving other performance indicators, the present invention provides a kind of non-packed dry type power transformers.
The technical solution adopted by the present invention is：A kind of non-packed dry type power transformer, including winding assembly, be set to it is described
The upper fixing element on winding assembly top and lower fixing piece set on the winding assembly bottom end, the winding assembly includes iron
Core, low pressure winding and high-voltage winding on the iron core are equipped with insulating paper between the low pressure winding and high-voltage winding,
Its innovative point is：The insulating paper includes double-layer structure：Nonwoven layer and high temperature resistance polyester film layer, the nonwoven layer and
It is not easy to be layered using jointing material bonding between high temperature resistance polyester film layer；The nonwoven layer includes 5-30wt% aromatics polyamides
Amine fiber, 60-80wt% aramid pulps and 10-15wt% aramid staple fibers.
In some embodiments, the nonwoven layer is poly- comprising 20wt% aramid fibrids, 70wt% aromatics
Amide paper pulp and 10wt% aramid staple fibers.
In some embodiments, the aramid fibrid is para-aramid fiber.
In some embodiments, the aramid staple fiber is para-aramid staple fiber.
In some embodiments, the aramid pulp is the para-aramid paper with 0.5-6mm length
Slurry.
In some embodiments, the thickness of the nonwoven layer is 0.06mm.
In some embodiments, the raw material of the high temperature resistance polyester film layer are polyethylene terephthalate,
The thickness of the high temperature resistance polyester film layer is 0.06-1.80mm.
In some embodiments, the coating thickness of the jointing material is 0.186~0.196mm.
In some embodiments, the production method of the insulating paper is：First in the high temperature resistance polyester film layer
The jointing material is uniformly smeared in front, by the tiling of ready nonwoven layer to uniformly filling the described resistance to of the jointing material
It is flattened behind the front of high-temperature polyester film layer；It is then placed in baking oven and is toasted, taken out after solidification crystallization；Again in the resistance to height
The reverse side of warm laminated polyester film uniformly fills the jointing material；It is placed again into baking oven and is toasted, taken out after solidification crystallization,
Heatproof temperature is made of the insulating paper of 280-350 degree at this time.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) non-packed dry type power transformer of the invention is made jointly due to the dielectricity of jointing material and polyester film
It obtains insulating paper and reaches preferable insulation effect；Using the polyester film that surface is smooth, when being put into motor, reduce between motor
Friction, ensures the work quality of motor.
(2) non-packed dry type power transformer of the invention, nonwoven layer include 5-30wt% aramid fibrids,
60-80wt% aramid pulps and 10-15wt% aramid staple fibers.Therefore, to the component part of nonwoven layer
It is optimized, compared to other combinations, the dielectric strength (being indicated with kV/mm) and tensile figure of non-woven fabrics of the present invention obtain
Larger raising, that is to say, that nonwoven layer of the invention has good tearing strength.
(3) non-packed dry type power transformer of the invention gives best numerical value cooperation, can obtain best tear
Resistance to spalling and tensile strength, and ensure good insulation preformance, all keep extremely good during the entire service life of transformer
Electric property and mechanical performance.
(4) non-packed dry type power transformer of the invention, the considered critical composition thickness of each layer, reduces electrical loss,
Marginal capacity is improved, increases safety and reliability, and reduce the dosage of its material and insulating paper, to reduce product size,
Reduce cost, however, most important purpose is, the hardness of the thickness effect insulating paper of each layer, resilience, whether be easy to insert it is embedding etc.
Performance, in the present invention, each layer thickness finally determined ensure that insulating paper can keep 90% left side of former intensity under 280 degree
The right side is persistently remained to keep 80% or so of original intensity under the conditions of 300 degree using 600h, persistently be used under the conditions of 350 degree
100h remains to keep 65% or so of original intensity, and therefore, heat resistance and electric property are all than more prominent.
Description of the drawings
Fig. 1 is non-packed dry type structure of power transformer schematic diagram of the present invention；
Fig. 2 is the structural schematic diagram of winding assembly of the present invention.
Specific implementation mode
Below in conjunction with drawings and examples, the present invention will be described in further detail.It should be appreciated that described herein
Specific examples are only used to explain the present invention, is not intended to limit the present invention.
The present invention discloses a kind of non-packed dry type power transformers, as shown in Figure 1：Including winding assembly 1a, it is set to institute
State the upper fixing element 2a on the tops the winding assembly 1a and lower fixing piece 3a set on the bottom ends the winding assembly 1a, the winding group
Part 1a includes iron core 4a, the low pressure winding 5a on the iron core 4a and high-voltage winding 6a, the low pressure winding 5a and height
It is equipped with insulating paper 7a between pressure winding 6a, it is described exhausted in this embodiment of the present invention as the inventive point of the present invention
Edge paper 7a includes double-layer structure：Nonwoven layer and high temperature resistance polyester film layer, the nonwoven layer and high temperature resistance polyester film layer
Between using jointing material bonding be not easy to be layered；In the present invention, due to the dielectricity of jointing material and polyester film, make jointly
It obtains insulating paper and reaches preferable insulation effect；Using the polyester film that surface is smooth, when being put into motor, reduce between motor
Friction, ensures the work quality of motor.As it is further preferred that the present invention this embodiment in, the nonwoven layer
Including 5-30wt% aramid fibrids, 60-80wt% aramid pulps and the short fibre of 10-15wt% aromatic polyamides
Dimension.In the present invention, the component part of nonwoven layer is optimized, compared to other combinations, the dielectric of non-woven fabrics of the present invention
Intensity (being indicated with kV/mm) and tensile figure are greatly improved, that is to say, that nonwoven layer of the invention has good
Good tearing strength.
As it is further preferred that in this embodiment of the present invention, the nonwoven layer is poly- comprising 20wt% aromatics
Amid fibers, 70wt% aramid pulps and 10wt% aramid staple fibers.The present invention gives best numbers
Value cooperation can obtain best tearing strength and tensile strength, and ensure good insulation preformance, in the entire of transformer
Extremely good electric property and mechanical performance are all kept during service life.
Specifically, in this embodiment of the present invention, the aramid fibrid is that para-aramid class is fine
Dimension.The aramid staple fiber is para-aramid staple fiber.The aramid pulp is with 0.5-6mm long
The para-aramid paper pulp of degree.Select the insulating paper of above-mentioned fiber, insulating paper is non-aging, it is resistance to contraction and it is incompressible, in addition
Elastic force extra-heavy even if after it is hereby ensured that transformers using the several years, coil still holding structure is close, and is capable of short circuit
Pressure.In addition, using the smooth polyester film in surface, when being put into motor, reduce the friction between motor, the work of micromotor
Make quality.
In test, it was noticed that the thickness of each composition of insulating paper, mechanical performance to insulating paper itself and electrical
Performance has a very big impact, and therefore, in this embodiment of the present invention, the thickness of the nonwoven layer is 0.06mm；Into
One step, the raw material of the high temperature resistance polyester film layer are polyethylene terephthalate, the high temperature resistance polyester film
The thickness of layer is 0.06-1.80mm, and further, the coating thickness of the jointing material is 0.186~0.196mm.In this hair
In bright, the considered critical composition thickness value or thickness range of each layer can effectively reduce transformer electrical loss, improve transformer
Marginal capacity increases safety and reliability, and reduces the dosage of its material and insulating paper, to reduce product size, reduces
Cost, however, most important purpose is, whether the hardness of the thickness effect insulating paper of each layer resilience, is easy to insert the property such as embedding
Can, in the present invention, each layer thickness finally determined, the hardness height of insulating paper, resilience are good, are easy to slotting embedding, ensure that insulation
Paper can keep 90% or so of former intensity under 280 degree, persistently remain to keep original intensity using 600h under the conditions of 300 degree
80% or so, under the conditions of 350 degree persistently use 100h, remain to keep 65% or so of original intensity, therefore, heat resistance and
Electric property is all than more prominent.
It is a further object of the present invention to provide the production methods of above-mentioned insulating paper：
The jointing material is uniformly smeared in the front of the high temperature resistance polyester film layer first, by ready non-woven fabrics
It is flattened after layer tiling to the front for the high temperature resistance polyester film layer for uniformly filling the jointing material；It is then placed in baking oven
(baking temperature is 60 degree, baking time 10min) is toasted, is taken out after solidification crystallization；It is thin in the high temperature resistance polyester again
The reverse side of film layer uniformly fills the jointing material；It is placed again into baking oven and is toasted that (baking temperature is 100 degree, when baking
Between be 3min), solidification crystallization after take out, heatproof temperature is made of the insulating paper of 280-350 degree at this time.
The preferred embodiment of the present invention has shown and described in above description, as previously described, it should be understood that the present invention is not office
Be limited to form disclosed herein, be not to be taken as excluding other embodiments, and can be used for various other combinations, modification and
Environment, and can be changed by the above teachings or related fields of technology or knowledge in the scope of the invention is set forth herein
It is dynamic.And changes and modifications made by those skilled in the art do not depart from the spirit and scope of the present invention, then it all should be appended by the present invention
In scope of the claims.
Claims (9)
1. a kind of non-packed dry type power transformer, including winding assembly (1a), it is set to the upper of the top the winding assembly (1a)
Fixing piece (2a) and the lower fixing piece (3a) for being set to the bottom end the winding assembly (1a), the winding assembly (1a) includes iron core
(4a), the low pressure winding (5a) on the iron core (4a) and high-voltage winding (6a), the low pressure winding (5a) and high pressure
Insulating paper (7a) is equipped between winding (6a), it is characterised in that：The insulating paper (7a) includes double-layer structure：Nonwoven layer and resistance to
High-temperature polyester film layer is not easy to be layered between the nonwoven layer and high temperature resistance polyester film layer using jointing material bonding；Institute
It includes 5-30wt% aramid fibrids, 60-80wt% aramid pulps and 10-15wt% aromatics to state nonwoven layer
Polyamide short fibre.
2. non-packed dry type power transformer according to claim 1, it is characterised in that：The nonwoven layer includes
20wt% aramid fibrids, 70wt% aramid pulps and 10wt% aramid staple fibers.
3. non-packed dry type power transformer according to claim 1 or 2, it is characterised in that：The aromatic polyamide
Fiber is para-aramid fiber.
4. non-packed dry type power transformer according to claim 1 or 2, it is characterised in that：The aromatic polyamides is short
Fiber is para-aramid staple fiber.
5. non-packed dry type power transformer according to claim 1 or 2, it is characterised in that：The aramid paper
Slurry is the para-aramid paper pulp with 0.5-6mm length.
6. non-packed dry type power transformer according to claim 5, it is characterised in that：The thickness of the nonwoven layer is
0.06mm。
7. non-packed dry type power transformer according to claim 5, it is characterised in that：The high temperature resistance polyester film layer
Raw material be polyethylene terephthalate, the thickness of the high temperature resistance polyester film layer is 0.06-1.80mm.
8. non-packed dry type power transformer according to claim 5, it is characterised in that：The coating of the jointing material is thick
Degree is 0.186~0.196mm.
9. non-packed dry type power transformer according to claim 8, it is characterised in that：The production of the insulating paper (7a)
Method is：The jointing material is uniformly smeared in the front of the high temperature resistance polyester film layer first, by ready non-woven fabrics
It is flattened after layer tiling to the front for the high temperature resistance polyester film layer for uniformly filling the jointing material；It is then placed in baking oven
It is toasted, is taken out after solidification crystallization；Again the jointing material is uniformly filled in the reverse side of the high temperature resistance polyester film layer；Again
Secondary be put into baking oven is toasted, and is taken out after solidification crystallization, heatproof temperature is made of the insulating paper of 280-350 degree at this time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810070864.9A CN108305766A (en) | 2018-01-24 | 2018-01-24 | A kind of non-packed dry type power transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810070864.9A CN108305766A (en) | 2018-01-24 | 2018-01-24 | A kind of non-packed dry type power transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108305766A true CN108305766A (en) | 2018-07-20 |
Family
ID=62866491
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810070864.9A Pending CN108305766A (en) | 2018-01-24 | 2018-01-24 | A kind of non-packed dry type power transformer |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0869937A (en) * | 1994-08-31 | 1996-03-12 | Osaka Denki Co Ltd | Manufacture of welding transformer for resistance welding |
| CN103325548A (en) * | 2013-07-22 | 2013-09-25 | 江苏源通电气有限公司 | Non-encapsulated dry type power transformer |
| CN204054840U (en) * | 2014-07-29 | 2014-12-31 | 湖北云峰绝缘材料有限公司 | Insulating paper |
| CN104798144A (en) * | 2012-11-23 | 2015-07-22 | 帝人芳纶有限公司 | Electrical insulating paper |
| CN105216392A (en) * | 2015-11-18 | 2016-01-06 | 南通中菱绝缘材料有限公司 | Insulating paper |
-
2018
- 2018-01-24 CN CN201810070864.9A patent/CN108305766A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0869937A (en) * | 1994-08-31 | 1996-03-12 | Osaka Denki Co Ltd | Manufacture of welding transformer for resistance welding |
| CN104798144A (en) * | 2012-11-23 | 2015-07-22 | 帝人芳纶有限公司 | Electrical insulating paper |
| CN103325548A (en) * | 2013-07-22 | 2013-09-25 | 江苏源通电气有限公司 | Non-encapsulated dry type power transformer |
| CN204054840U (en) * | 2014-07-29 | 2014-12-31 | 湖北云峰绝缘材料有限公司 | Insulating paper |
| CN105216392A (en) * | 2015-11-18 | 2016-01-06 | 南通中菱绝缘材料有限公司 | Insulating paper |
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Application publication date: 20180720 |
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