CN106992063A - A kind of dry-type transformer coil and its manufacture method - Google Patents
A kind of dry-type transformer coil and its manufacture method Download PDFInfo
- Publication number
- CN106992063A CN106992063A CN201710395010.3A CN201710395010A CN106992063A CN 106992063 A CN106992063 A CN 106992063A CN 201710395010 A CN201710395010 A CN 201710395010A CN 106992063 A CN106992063 A CN 106992063A
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- China
- Prior art keywords
- heat radiation
- resin
- conduit
- coil
- conductive material
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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
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- 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
- H01F27/2876—Cooling
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulating Of Coils (AREA)
Abstract
Present invention relates particularly to a kind of dry-type transformer and its manufacture method, specifically include：Multiple layers, multiple heat radiation conduits, a kind of resin being made up of the conductive material of certain length, and multiple layers that the multiple heat radiation conduit and big envelope have resin match in terms of calorifics and electricity, the material of the heat radiation conduit is epoxy resin, ground conduit is made by epoxy resin, the thermal gradient of this cured tube is close with the thermal gradient of epoxy resin, and the epoxy resin will carry out sleeve in process below to transformer coil.So, these materials will be expanded and be shunk with essentially identical speed, so as to reduce the internal stress certainly existed in the curing cycles of epoxy resin.
Description
Invention field
The present invention relates to field transformer, specifically, the present invention relates to a kind of dry-type transformer coil and its manufacturer
Method.
Background of invention
In the prior art, dry-type encapsulated transformer coils are either coated with resin or by vacuum chamber and gelatination furnace ring
The casting of oxygen tree fat is formed.Epoxy resin can provide transformer coil good protection；But, this material is asked in the presence of radiating
Topic.To enable heat to be distributed around coil, it is necessary to heat radiation conduit is set on the precalculated position in coil, with profit
In radiating, so as to improve the operating efficiency of coil and the service life of extension coil.
The conventional method for forming heat radiation conduit is exactly installed in continuous conductive material in winding process by solid baffle
Between layer.Solid metal, the metal for being coated with fabric and scribble the elastic baffle and pad of grease and may be incorporated in coil
Gap is formed between layer.After encapsulating the coil, it is possible to disassemble these dividing plates.No matter dividing plate used is
Which kind of type, the problem of this method all has inefficiency and may damaged, because pulling equipment or overhead crane must be utilized
These dividing plates could be forced to disassemble.These dividing plates are often damaged in unloading process, are so accomplished by carrying out it
Repair or change, in addition, duct spacers, such as aluminium, it is also possible to cause the damage of coil in many ways.In hardening process
In, stress cutting just occurs in difference, therefore coil because the thermal expansion amount and amount of contraction of epoxy resin and aluminum spacer plate are present
Split problem.Due in the unloading process of dividing plate still may hardening coil in produce mechanical breaking, therefore, dividing plate most
The requirement of small spacing will reduce the quantity for the heat radiation conduit that can be set in coil.Needed for so conductive material can be increased again
Thickness, it is therefore an objective to abundant radiating can be realized in operation.In addition, in the unloading process of dividing plate, epoxy sheet
Or block is often split away off from coil, this sleeve formula coil is thus set to lose wanted role.
The content of the invention
The present invention relates to a kind of dry-type transformer and its manufacture method.
One aspect of the present invention is to provide a kind of dry-type transformer coil, including：By the conductive material of certain length
The multiple layers constituted；Multiple heat radiation conduits, the heat radiation conduit is made up of thermoplastic and is disposed on the multiple lead
Between material layer；A kind of resin, the resin is used to carry out big envelope to multiple conductive material layers and surrounded in multiple heat radiation conduits
Each conduit；Multiple layers that the multiple heat radiation conduit and big envelope have resin match in terms of calorifics and electricity.
The material of the heat radiation conduit is epoxy resin.Ground conduit is made by epoxy resin, this conduit is adapted as
Heat radiation conduit, which is permanently installed in big envelope, to be had on the dry-type transformer coil of resin, and this conduit, which can be processed to a kind of big envelope, to be had
The glass fiber matrix of resin, this matrix can be processed to a kind of flexible, durable conduit by pultrusion and hardening.It is this
The thermal gradient of cured tube is close with the thermal gradient of epoxy resin, the epoxy resin by process below to transformer wire
Circle carries out sleeve.So, these materials will be expanded and be shunk with essentially identical speed, so as to reduce in epoxy resin
Curing cycles in the internal stress that certainly exists.One or more pultruded tubes can be cut into and be adapted to be mounted within coil windings
Between length.These conduits are cut into the winding height of slightly shorter than coil, so as to eliminate in winding process with operator
The possibility that member interferes.
In a preferred embodiment of the invention, this heat radiation conduit is fixedly installed to the dry type change for being encapsulated with resin
In transformer coil.The transformer coil of this sleeve includes：Single line circle, the coil be provided with it is multiple had by one kind it is continuous long
The layer that the conductive material of degree is processed；With multiple heat radiation conduits being made in the manner described above, these heat radiation conduits are arranged on
Between the winding layer of conductive material.Sleeve is carried out to coil with a kind of resin and each heat radiation conduit is surrounded.These heat radiation conduits
It can match with the coil for being encapsulated with resin in terms of thermodynamics and electricity.
Present invention additionally comprises a kind of manufacture method of dry-type transformer coil, this method comprises the steps：
(a) multiple layers are made by the way that the conductive material of certain length is wound up on a core body；
(b) multiple heat radiation conduits being made up of thermoplastic are arranged between the multiple conductive material layer；
(c) the multiple conductive material layer big envelope is got up using resin and surrounds these heat radiation conduits, the resin with by heat
The heat radiation conduit that plastic material is made matches in terms of calorifics and electricity；
(d) cure process is carried out to the resin, multiple heat radiation conduits is integrally formed in the resin.
Before big envelope is carried out to coil with resin and the multiple heat radiation conduit is surrounded, inside and outside mould is placed
Around coil, so as to form a space for being used to accommodate resin between the inside and outside mould, by one once
The inner mould of property is installed on an annular element, or is supported on heart axle.Then, by it is a kind of be made of an electrically conducting material it is continuous
Coil is wound up on the inner mould, while the heat radiation conduit cut in advance is installed between continuous coil layer.Complete
When winding work, coil is disassembled from the heart axle of up- coiler and is erected on a silicon heelpiece, to seal the part
Bottom, so as to prevent epoxy resin from being leaked in follow-up encapsulation process.Epoxy resin is filled with to carry out big envelope to coil
And encase heat radiation conduit.Then, cure process is carried out to the part in a hardening furnace, hereafter, by inside and outside mould
Pull down.
Those skilled in the art will be clear that after connection with figures reads the following explanation to preferred embodiment
Aforementioned aspect of the present invention and other side.It should be appreciated that：Generality above illustrates that with following detailed description be only example
Property and explanatory, is not limitation of the present invention.
Brief description of the drawings
Fig. 1 is the perspective view of the heat radiation conduit of the present invention；
Fig. 2 is a kind of perspective view for the dry-type transformer coil for being encapsulated with resin, and the wherein dry-type transformer coil is fixedly mounted
There is heat radiation conduit；
Fig. 3 is sectional view of the transformer coil along hatching 3-3 shown in Fig. 2；
Fig. 4 is to show in perspective view, figure the conductive material of certain length being wound into a coil and by multiple resins
The step of heat radiation conduit is between multilayer conductive material；
Fig. 5 is the perspective view for the provisional connector being arranged on the resin heat radiation conduit end of the present invention；
Fig. 6 is the end view of the connector shown in Fig. 5；
Fig. 7 is to show in the perspective view of partly cut-away, figure outer mold to be arranged on around coil and will be interior with resin
The step of space between portion's mould and outer mold is filled up.
Embodiment
As shown in figure 1, one aspect of the present invention is related to a kind of dry-type transformer coil, including：By certain length
Multiple layers that conductive material is constituted；Multiple heat radiation conduits 24, the heat radiation conduit is made and is disposed on by thermoplastic
Between the multiple conductive material layer；A kind of resin, the resin is used to carry out big envelope to multiple conductive material layers and surrounds multiple
Each conduit in heat radiation conduit；The multiple heat radiation conduit and big envelope have multiple layers of resin phase in terms of calorifics and electricity
Match somebody with somebody.The material of the heat radiation conduit is epoxy resin, and the conduit is used as heat radiation conduit and is permanently mounted to a sleeve
Have on the transformer coil of resin.The cross section in the conduit road is generally elliptical, and the conduit be additionally provided with it is rounded
End 12 and substantially straight side 14.Although for the present invention, the geometry of the conduit is not key
Factor, it has been found that：When the linear dimension x of the conduit is about conduit width d three times, conduit formation can be installed
Optimal structural shape between the alternate layer of wound coil.Moreover, it is also possible to using these relative sizes to the conduit
Structure is optimized, and big envelope is had the system (such as transformer coil) of resin with optimal heat transfer performance.Citing
For, its linear dimension of conduit x constructed according to the invention is about 2.7 inches, and width d is about 0.9 inch, wall thickness
W is about 0.1 inch.The conduit is also devised at least bear the knot of the vacuum action of 1 millibar in vacuum casting procedure
Configuration formula, it is described in detail below.
The conduit of the present invention is preferably made up of a kind of suitable thermoplastic (such as polyester resin) of pultrusion method.Draw
Squeezing is a kind of method for being used to manufacture the continuous polymer profiles (such as body or cylinder) strengthened by fiber, in this method
In, band coating fiber by a heated mould by drawing, so as to produce a kind of shape with high intensity.Through
The conduit of pultrusion is reinforced by glass fiber, and these glass fiber are mutually aligned to form unidirectional rove or multidirectional pad.
Include an outer glass fiber reinforcement pad for the reinforcement structure in the conduit of the present invention and an internal glass fibers are strengthened
Pad.The conduit can be hardened more than B grades once after being made into using conventional curing method well known in the art.In order to be able to
Enough it is integrally formed into dry-type encapsulated transformer coils, it is necessary to certain material property.
The length l of the conduit is totally dependent on its application conditions；That is, can be applicable to specific field transformer
The pultrusion pipe is cut into certain length.As described below, the total length of conduit should be less than the total height of transformer coiling coil,
So as to which conduit is wrapped completely, while the end edge of conduit is fixed on hardening resin.At one of the present invention
In most preferred embodiment, above-mentioned conduit is fixedly installed to one and is encapsulated with the dry-type transformer coil of resin.
Referring now to Fig. 2 and 3, this dry-type transformer coil 20 for being encapsulated with resin includes：One coil 22, multiple one
The heat radiation conduit 24 of formula and a kind of resin 26 for being used to carry out coil 22 big envelope.When formed, the main body of transformer coil 20
It is limited between inner surface 20a and outer surface 20b, and the shape of the inner surface and outer surface is limited by mould, specifically
As described below.Inner surface 20a has circumferentially defined an open area or core body 21, and its manufacture method is described in detail below.Enclose
The coil 22 around core body 21 is wound on by being constituted in the conductive plate 22a and insulating thin 22b of alternate layers.When conductor is thin
When plate 22a and insulating thin 22b are continuously wound up on core body 21, the heat radiation conduit 24 being made in the manner described above is inserted simultaneously
It is interval between each continuous layer.The heat radiation conduit of the present invention is permanently incorporated into type encapsulated transformer coils.Add
Integrated radiating conduit 24 can improve the dielectric strength of coil.As defining as used herein and generally in the industry, " insulation
Intensity " refers to the maximum potential gradient that a kind of material can be born on the premise of without destruction is produced.Integrated radiating conduit
24 not only have required insulation characterisitic, and they have also added an additional insulation barrier to convolute coil.Thus may be used
To improve the durability of coil 22 and extend its service life.Because the integrated radiating conduit 24 being so formed from a resin may be used also
To improve the heat-sinking capability per layer line circle 22, therefore it can just be reduced to make conductor 22a obtain the thickness needed for optimum performance.Example
Such as, conductive plate 22b thickness can change in the range of about 0.020 inch to 0.180 inch, and integral type conduit it
Between spacing can also change in the range of about 0.125 inch to 1.0 inches.Therefore, this integrated radiating guide-tube structure
The breakage of resin would not be caused due to the dismounting of catheter shaft or dividing plate, and this integral type conduit 24 can also more step up
Thickly it is installed together, so as to increase the sum of heat radiation conduit 24, thus can correspondingly improves heat-sinking capability.When one
During the quantity increase of body formula conduit, the thickness needed for conductor 22a is also reduced.
Rolled transformer coil 20 is got up by the big envelope of epoxy resin 26, the epoxy resin poured into internal and
In space between outer mold.This thermosetting resin can be in terms of electrically and thermally with manufacturing the tree used in heat radiation conduit 24
Lipid phase is matched.Once completing big envelope and curing, the transformer coil with this structure is also formed.
The present invention also provides a kind of manufacture method of dry-type transformer coil.It can be used for manufacture basis in spite of a variety of methods
This dry-type transformer coil for being encapsulated with resin of the present invention, but one kind is provided with the integral type winding heart
The disposable winding of axle and into band mould.
As shown in figure 4, a coil winder 40 for being provided with a conventional mandrel 41 is used to manufacture substantially circular line
Circle 20.Once the inner mould 42 being made up of thin-sheet metal or other suitable materials is installed on heart axle 41, so as to form one
During individual core body, it is possible to which coil is wound up on the core body.Generally, first by a kind of insulating materials of glass grid
(not shown) is wound up on the inner mould 42, then winds the first circle or first layer coil 22.As shown in figure 4, coil 22 by
Formed with the copper conductor thin plate 22a of alternate layers and insulating thin 22b windings.The thickness of insulating thin also depends on change
The concrete structure of transformer coil, but in an embodiment of the present invention, its thickness can be in about 0.005 inch and 0.030 inch of model
Enclose interior change.In winding process, heat radiation conduit 24 is inserted between conductor layer 22a, so that the shape in the transformer being made
Into multiple heat radiation conduits.It will be appreciated that：The heat radiation conduit 24 of this integral type can be inserted between every layer of conductor 22a or interlayer
Inserting etc., this is also dependent upon the concrete structure of transformer coil.
Can be led in the inserting of conduit plug 25,27 for coil 22 installed at any time before resin encapsulation to radiating
In the openend of pipe 24, to enable during resin encapsulation in resin inflow catheter 24.Fig. 5 and 6 is the phase of connector 25,27
To position and the external view of geometry.Top plug 25 is dimensioned to by friction fit in heat radiation conduit
Structure type in 24 open top.Herein, " top " of heat radiation conduit, which is located at, stretches out coil lead (not shown)
On end turn.Top plug 25 is tapered (i.e. downwards) inwards, and its periphery is provided with fin 25, to be led with radiating
The inner surface of pipe 24 forms reliable sealing.Outside (i.e. top) main body 26 of connector is outwards slightly tapered, this makes it possible to
It is easily taken out from the hardening resin of surrounding after big envelope.One handle or gripping portion 25c are conducive in hardening process
Connector is taken out afterwards.Because connector 25,27 is by each end in resin encapsulation and hardening process to each heat radiation conduit 24
Sealed, therefore an open channel or vent 25d can be just formed on connector 25, to prevent heat radiation conduit 24
It is broken.In addition to not needing vacuum decompression and handle function, bottom plug 27 has identical function with top plug.Insert bottom
Plug 27 is additionally provided with for the fin 27a with the frictional engagement of the inwall of heat radiation conduit 24.The outermost end 27b of connector 27 is essentially flat
Planar, the bottom of such coil can just erect and be sealed on a backing plate, then to carry out resin encapsulation.
By coil 22 be wound into needed for the number of plies and by sufficient amount of heat radiation conduit 24 install between the layers it
Afterwards, the coil is removed from up- coiler 40 and top plug is erect up.By coil 20 be placed on one by silicon or
On the pad 50 that other suitable materials being pressurized are made.When so placed, the planar ends 27b of bottom plug 27 will be pressed on
On pad 50.Then, it is possible to by outer mold bag around vertical coil 20.As can see from Figure 7, an outer mold
60 surround coil 20.Outer mold 60 can by sheet metal or it is other can fix or colligation to coil 20 on rigid material
It is made, while certain gap is left between mould 60 and coil 20, so that the complete big envelope of coil 20 be got up.Lanoue
Et al. patent disclose a kind of structure of outer mold, but it is also possible to using other appropriate formats well known in the art mould
Tool.The outer mold 60 being pressed on silicon pad 50 can prevent bottom leakage of the epoxy resin from coil in encapsulation process.
When outer mold 60 is on correct position, it is possible to carry out the big envelope process of epoxy resin.By the ring of flowing
Oxygen tree fat 26 is filled into mould, so that coil big envelope be got up and also wrap spaced heat radiation conduit 24.Filling
During note, the epoxy resin 26 being deposited in the lower space between inside and outside mould will surround bottom with certain depth
Portion's connector 27, planar section 27b of the depth substantially with connector 27 is concordant.Resin will extend to heat radiation conduit by being filled into always
On the top edge of 24 upper ends at about 3/16 inch untill.
Hardening process is conventional processes, and is well known in the art.For example, cure cycle may include：(1) about
Under conditions of 85 degrees Celsius, the gel phase of about 5 hours is carried out；(2) about 140 DEG C of process is increased to from about 85 DEG C in temperature
In, the ramp up (ramp up portion) of progress about 2 hours；(3) under conditions of 140 DEG C, about 6 hours consolidate
The change stage (4) under conditions of 80 DEG C, carries out the descending stage (ramp down portion) of about 4 hours., will be interior after hardening
Portion and outer mold are pulled down.Top plug 25 is easily removed using pliers or other clamping parts, without destroying week
The resin enclosed.Can be by the way that a bar or rod (not shown) be inserted into the top of each heat radiation conduit and the side of bottom plug is penetrated
Formula pulls down bottom plug.
Although being had been described with reference to most preferred embodiment to the present invention, it should be appreciated that：The present invention design and
In protection domain, a variety of variations and modifications can be carried out, this is that those skilled in the art are able to know that.These modifications and variations
In the protection domain for each falling within appended claims and its equivalents.
Claims (4)
1. a kind of dry-type transformer coil, it is characterised in that：Including：
The multiple layers being made up of the conductive material of certain length；
Multiple heat radiation conduits, the heat radiation conduit be made up of thermoplastic and be disposed on the multiple conductive material layer it
Between；
A kind of resin, the resin is used to carry out multiple conductive material layers big envelope and surrounds each leading in multiple heat radiation conduits
Pipe；
Multiple layers that the multiple heat radiation conduit and big envelope have resin match in terms of calorifics and electricity.
2. dry-type transformer coil according to claim 1, it is characterised in that：The material of the heat radiation conduit is asphalt mixtures modified by epoxy resin
Fat.
3. a kind of manufacture method of dry-type transformer coil, this method comprises the steps：
(a) multiple layers are made by the way that the conductive material of certain length is wound up on a core body；
(b) multiple heat radiation conduits being made up of thermoplastic are arranged between the multiple conductive material layer；
(c) the multiple conductive material layer big envelope is got up using resin and surrounds these heat radiation conduits, the resin with by heat
The heat radiation conduit that plastic material is made matches in terms of calorifics and electricity；
(d) cure process is carried out to the resin, multiple heat radiation conduits is integrally formed in the resin.
4. the manufacture method of dry-type transformer coil according to claim 3, also comprises the steps：With resin to line
Circle carries out big envelope and surrounded before the multiple heat radiation conduit, inside and outside mould is placed on around coil, so that in institute
State space of the formation one for accommodating resin between inside and outside mould.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710395010.3A CN106992063A (en) | 2017-05-30 | 2017-05-30 | A kind of dry-type transformer coil and its manufacture method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710395010.3A CN106992063A (en) | 2017-05-30 | 2017-05-30 | A kind of dry-type transformer coil and its manufacture method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106992063A true CN106992063A (en) | 2017-07-28 |
Family
ID=59420835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710395010.3A Pending CN106992063A (en) | 2017-05-30 | 2017-05-30 | A kind of dry-type transformer coil and its manufacture method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106992063A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111540587A (en) * | 2019-02-06 | 2020-08-14 | Tdk株式会社 | Coil device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6160464A (en) * | 1998-02-06 | 2000-12-12 | Dynapower Corporation | Solid cast resin coil for high voltage transformer, high voltage transformer using same, and method of producing same |
| CN2497409Y (en) * | 2001-05-10 | 2002-06-26 | 上海通用电气广电有限公司 | Foil-wound resin casting dry-type transformer high-voltage coil |
| CN1615530A (en) * | 2001-12-21 | 2005-05-11 | Abbt&D技术有限公司 | Integrated cooling duct for resin-encapsulated distribution transformer coils |
-
2017
- 2017-05-30 CN CN201710395010.3A patent/CN106992063A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6160464A (en) * | 1998-02-06 | 2000-12-12 | Dynapower Corporation | Solid cast resin coil for high voltage transformer, high voltage transformer using same, and method of producing same |
| CN2497409Y (en) * | 2001-05-10 | 2002-06-26 | 上海通用电气广电有限公司 | Foil-wound resin casting dry-type transformer high-voltage coil |
| CN1615530A (en) * | 2001-12-21 | 2005-05-11 | Abbt&D技术有限公司 | Integrated cooling duct for resin-encapsulated distribution transformer coils |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111540587A (en) * | 2019-02-06 | 2020-08-14 | Tdk株式会社 | Coil device |
| CN111540587B (en) * | 2019-02-06 | 2023-11-24 | Tdk株式会社 | Coil device |
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Application publication date: 20170728 |