CN203386583U - Winding assembly of 20kV dry-type electric transformer - Google Patents

Winding assembly of 20kV dry-type electric transformer Download PDF

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Publication number
CN203386583U
CN203386583U CN201320509276.3U CN201320509276U CN203386583U CN 203386583 U CN203386583 U CN 203386583U CN 201320509276 U CN201320509276 U CN 201320509276U CN 203386583 U CN203386583 U CN 203386583U
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CN
China
Prior art keywords
voltage coil
low
coil
insulating
coiling
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.)
Expired - Fee Related
Application number
CN201320509276.3U
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Chinese (zh)
Inventor
何建林
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NANCHANG TRANSFORMER Co Ltd
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NANCHANG TRANSFORMER Co Ltd
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Publication date
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Priority to CN201320509276.3U priority Critical patent/CN203386583U/en
Application granted granted Critical
Publication of CN203386583U publication Critical patent/CN203386583U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses a winding assembly of a 20kV dry-type electric transformer. The winding assembly comprises a low-voltage coil, a high-voltage coil and an iron core. The high-voltage coil is of a subsection layer type structure, glass fiber grid cloths are arranged between layers and sections of the high-voltage coil for insulation, and mechanical strength of the high-voltage coil is effectively improved. The low-voltage coil is of a foil type structure, a presoak type DMD material is used as an insulation layer, so that stability of the low-voltage coil is enhanced, and short circuit resistance is improved. The inner side portion and the outer side portion of an insulation piece are in surface contact with the low-voltage coil and the high-voltage coil respectively, and deformation of the coils is reduced.

Description

The coiling assembly of 20kV dry-type power transformer
Technical field
The utility model relates to dry-type transformer, relates in particular to the coiling assembly of 20kV dry-type power transformer, and this dry-type transformer adopts the resin one-piece casting.
Background technology
Dry-type transformer just refers to that iron core and winding are not immersed in the transformer in insulating oil.In electric power system, general steam turbine transformer, boiler transformer, ash disposal transformer, dust removing transformer, desulfurization transformer etc. are all dry-type transformers.In the prior art, the dry-type power transformer of 10kV is universal, but, along with the sustained and rapid development of China's economy and improving constantly of the level of urbanization, it is little that the 10kV distribution network system more and more demonstrates capacity, the shortcomings such as loss is large, and the land seizure amount is large, environmental-protecting performance is poor.For this reason, country call to be used the 20kV dry-type power transformer, and in order to capture emerging market, each show his special prowess in each large transformer manufacturer, the strength of contribution oneself in the transformer transformation.Will solve heat radiation, temperature rise, magnetic leakage, interlayer pressure difference etc. series of problems from the 10kV rank 20kV that risen, addressing these problems can be from the coiling assembly of optimizing transformer.
Granted publication CN102290217B discloses the C level three-dimensional wound core dry type transformer coil that a kind of suspension type is installed, in this transformer coil, gap between adjacent two line cakes forms small airway, and the gap between high-tension coil and low-voltage coil forms big airways.The air flue direction is consistent with the erecting bed wind direction, can guarantee transformer good heat radiation of when operation.
The PCT application case that publication number is CN101542653A discloses a kind of low-voltage coil and transformer; the winding of low-voltage coil is coated with in its peripheral surface the twister that four circle protective foils support; inner winding and outside winding are opened by separated, and this gap comprises that 12 rectangle hotels are as sept.
The winding structure of transformer of prior art can not meet the requirement of 20kV distribution transformer, Given this, is necessary to improve prior art.
The utility model content
The utility model proposes a kind of coiling assembly of 20kV dry-type power transformer, can improve mechanical strength, anti-short circuit capability and the local temperature rise of transformer coil.
The technical solution of the utility model is achieved in that
A kind of coiling assembly of 20kV dry-type power transformer, it is characterized in that comprising low-voltage coil, high-tension coil and iron core, described low-voltage coil and high-tension coil all are wrapped on described iron core, be provided with the first insulating barrier between described low-voltage coil and high-tension coil, described low-voltage coil comprises two-layer above metal forming, be provided with the second insulating barrier between described double layer of metal paper tinsel, described high-tension coil comprises the winding more than two sections, described winding is comprised of some layers of coiling, be provided with fiberglass gridding cloth between two sections described windings, wherein, in described low-voltage coil and high-tension coil, axial distribution has the insulating part more than three, form more than one air duct between adjacent described insulating part.
In the coiling assembly of this 20kV dry-type power transformer of the present utility model, described the first insulating barrier is epoxy resin layer, and the thickness of this epoxy resin layer is not less than 23mm.
In the coiling assembly of this 20kV dry-type power transformer of the present utility model, described the second insulating barrier is the DMD insulating paper.
In the coiling assembly of this 20kV dry-type power transformer of the present utility model, the width of described air duct is 21mm to 38mm.
In the coiling assembly of this 20kV dry-type power transformer of the present utility model, described metal forming is aluminium foil or Copper Foil.
In the coiling assembly of this 20kV dry-type power transformer of the present utility model, between two-layer described coiling, be provided with fiberglass gridding cloth.
In the coiling assembly of this 20kV dry-type power transformer of the present utility model, described insulating part is comprised of outside portion, inside portion and the support portion that connects described outside portion and inside portion, and described outside portion and inside portion are circular arc.
In the coiling assembly of this 20kV dry-type power transformer of the present utility model, described outside portion, inside portion and support portion form an air channel.
In the coiling assembly of this 20kV dry-type power transformer of the present utility model, have more than one breach on described outside portion and inside portion.
Implement this coiling assembly of utility model, have following beneficial effect: high-tension coil adopts segmented layered structure, and interlayer, intersegmental employing fiberglass gridding cloth insulate, and have effectively improved the mechanical strength of coil; Low-voltage coil adopts paper tinsel formula structure, and preimpregnation type DMD material is as insulating barrier, and the stability of intensifier coil, improve anti-short circuit capability; The inside portion of insulating part contacts with the formation face of low-voltage coil and high-tension coil respectively with outside portion, reduces the distortion of coil.
The accompanying drawing explanation
The single-phase schematic diagram of the coiling assembly that Fig. 1 is this 20kV dry-type power transformer of the present utility model;
A kind of cutaway view that Fig. 2 is Fig. 1, mainly shown the cross section of low-voltage coil;
The another kind that Fig. 3 is Fig. 1, to cutaway view, has mainly shown the cross section of high-tension coil;
Schematic diagram under the preferred implementation of the insulating part that Fig. 4 is Fig. 3;
Schematic diagram under another execution mode of the insulating part that Fig. 5 is Fig. 4.
Embodiment
Coiling assembly as the of the present utility model this 20kV dry-type power transformer of Fig. 1 to Fig. 5, mainly be comprised of low-voltage coil 1, high-tension coil 2 and iron core 3, specifically is described below.
Described high-tension coil 2 is wrapped on described iron core 3, and described high-tension coil 2 comprises the winding 21 more than two sections, and described winding is comprised of some layers of coiling 22, i.e. segmented layered structure.Between two sections described windings 21, between two-layer coiling 22, be provided with fiberglass gridding cloth, this fiberglass gridding cloth wraps up and fixes coiling 22, to improve the bulk strength of coil.The interior axial distribution of described high-tension coil 2 has the insulating part 4 of four, forms an air duct 5 between adjacent described insulating part 4.In the utility model, air duct 5 can be divided into high-tension coil 2 some independently parts, is beneficial to circulation of air.Wherein, the thickness of described air duct 5 is 21mm to 38mm.
Described low-voltage coil 1 is wrapped on described iron core 3, is provided with the first insulating barrier 11 between described low-voltage coil 1 and high-tension coil 2, and described the first insulating barrier 11 is epoxy resin layer, and the thickness of this epoxy resin layer is not less than 23mm.Described low-voltage coil 1 comprises two-layer above metal forming 12, and described metal forming 12 is aluminium foil or Copper Foil.Be provided with the second insulating barrier 13 between two-layer described metal forming 12, described the second insulating barrier 13 is the DMD insulating paper.Identical with described high-tension coil 2, in order to reduce the interlayer temperature rise, the interior axial distribution of described low-voltage coil 1 has the insulating part 4 more than three, in order to clearly illustrate insulating barrier, has omitted the insulating part in low-voltage coil 1 in figure.
As shown in Figure 4,5, described insulating part 4 is by 41, inside portion, outside portion 42 and connect 42 support portion, 41He inside portion, described outside portion 43 and form, and 41He inside portion, described outside portion 42 is circular arc.41 outer ring, outside portion radius equals the radius with this outside portion 41 contacted coils, and the inner ring radius of inside portion 42 equals and the contacted coil radius in this inside portion 42.Because coil tightly is banded on insulating part 4, the corner angle of insulating part 4 can cause coil local deformation, and then improve resistance, and each surface of this insulating part 4 of the present utility model all contacts with coil surface, has reduced distortion.Preferably, 41, inside portion 42, described outside portion and support portion 43 form an air channel 44.Have a breach 45 on 41He inside portion, described outside portion 42.Air channel 44 and breach 45 can further improve radiating effect.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.

Claims (9)

1. the coiling assembly of a 20kV dry-type power transformer, it is characterized in that comprising low-voltage coil, high-tension coil and iron core, described low-voltage coil and high-tension coil all are wrapped on described iron core, be provided with the first insulating barrier between described low-voltage coil and high-tension coil, described low-voltage coil comprises two-layer above metal forming, be provided with the second insulating barrier between described double layer of metal paper tinsel, described high-tension coil comprises the winding more than two sections, described winding is comprised of some layers of coiling, be provided with fiberglass gridding cloth between two sections described windings, wherein, in described low-voltage coil and high-tension coil, axial distribution has the insulating part more than three, form more than one air duct between adjacent described insulating part.
2. coiling assembly according to claim 1, is characterized in that, described the first insulating barrier is epoxy resin layer, and the thickness of this epoxy resin layer is not less than 23mm.
3. coiling assembly according to claim 1, is characterized in that, described the second insulating barrier is the DMD insulating paper.
4. coiling assembly according to claim 1, is characterized in that, the width of described air duct is 21mm to 38mm.
5. coiling assembly according to claim 1, is characterized in that, described metal forming is aluminium foil or Copper Foil.
6. coiling assembly according to claim 1, is characterized in that, between two-layer described coiling, is provided with fiberglass gridding cloth.
7. according to the described coiling assembly of claim 1 to 6 any one, it is characterized in that, described insulating part is comprised of outside portion, inside portion and the support portion that connects described outside portion and inside portion, and described outside portion and described inside portion are circular arc.
8. coiling assembly according to claim 7, is characterized in that, described outside portion, inside portion and support portion form an air channel.
9. coiling assembly according to claim 7, is characterized in that, on described outside portion and/or described inside portion, has more than one breach.
CN201320509276.3U 2013-08-20 2013-08-20 Winding assembly of 20kV dry-type electric transformer Expired - Fee Related CN203386583U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201320509276.3U CN203386583U (en) 2013-08-20 2013-08-20 Winding assembly of 20kV dry-type electric transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201320509276.3U CN203386583U (en) 2013-08-20 2013-08-20 Winding assembly of 20kV dry-type electric transformer

Publications (1)

Publication Number Publication Date
CN203386583U true CN203386583U (en) 2014-01-08

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109637771A (en) * 2018-12-29 2019-04-16 北京工业大学 A kind of fixing means of induction coil

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109637771A (en) * 2018-12-29 2019-04-16 北京工业大学 A kind of fixing means of induction coil

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GR01 Patent grant
C14 Grant of patent or utility model
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20140108

Termination date: 20160820

CF01 Termination of patent right due to non-payment of annual fee