CN208478109U - Natural esters insulating oil tractive transformer - Google Patents
Natural esters insulating oil tractive transformer Download PDFInfo
- Publication number
- CN208478109U CN208478109U CN201821451153.8U CN201821451153U CN208478109U CN 208478109 U CN208478109 U CN 208478109U CN 201821451153 U CN201821451153 U CN 201821451153U CN 208478109 U CN208478109 U CN 208478109U
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- Prior art keywords
- natural esters
- single condctor
- insulating oil
- tractive transformer
- insulating layer
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- 150000002148 esters Chemical class 0.000 title claims abstract description 51
- 150000001875 compounds Chemical class 0.000 claims abstract description 36
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052802 copper Inorganic materials 0.000 claims abstract description 12
- 239000010949 copper Substances 0.000 claims abstract description 12
- 238000009413 insulation Methods 0.000 claims description 56
- 238000005192 partition Methods 0.000 claims description 13
- 238000005452 bending Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims 1
- 238000004804 winding Methods 0.000 abstract description 8
- 239000003921 oil Substances 0.000 description 37
- 239000010410 layer Substances 0.000 description 33
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 239000012212 insulator Substances 0.000 description 4
- 125000006850 spacer group Chemical group 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 239000002826 coolant Substances 0.000 description 3
- 238000009422 external insulation Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000002480 mineral oil Substances 0.000 description 3
- 235000010446 mineral oil Nutrition 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 241001093269 Helicodiscus parallelus Species 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
This application discloses a kind of natural esters insulating oil tractive transformers, including the coil as made of compound wire coiling, compound wire is composed of multiple row single condctor, each column includes multiple single condctors of identical quantity, width direction along the cross section of single condctor is column, the outside of each single condctor is enclosed with the first insulating layer, integral outer after whole single condctor combinations is enclosed with second insulating layer, and the length of the cross section of each single condctor is less than the length of the cross section of original flat copper single condctor.Under conditions of same duty cycle, compound wire in this natural esters insulating oil tractive transformer reduces the axial dimension of single condctor, reduce the length of the cross section of single condctor, therefore, the outside leakage field of the long side for reducing single condctor from cross section, the lateral leakage field for reducing single condctor reduces the lateral eddy-current loss of transformer winding end on the basis of not increasing cost, reduces coiling hotspot temperature rise.
Description
Technical field
The utility model relates to tractive transformer technical field, in particular to a kind of natural esters insulating oil tractive transformer.
Background technique
Natural esters insulating oil tractive transformer is a kind of using natural esters insulating oil as the railway traction voltage transformation of cooling medium
Device.Natural esters insulating oil has an excellent environmental protection characteristic, and biological degradation rate is high, nontoxic, high-flash, have good water absorbing properties,
Dielectric properties and with inside transformer solid material compatibility, be used cooperatively, can prolong with the other heatproof insulating materials of transformer
Long transformer life and enhancing transformer overload ability；Good insulation characterisitic, breakdown voltage is high, water-tolerant.In view of natural
These characteristics of ester insulating oil possess wide fortune in some special occasions with natural esters insulating oil proxy mineral oil in power grid
Use prospect.
However natural esters insulating oil, compared with plain mineral oil, viscosity is larger, and mobility is slightly worse, brings not to product temperature rise
The influence of benefit, and there are a certain distance with plain mineral oil in terms of electric property for natural esters insulating oil.And existing traction becomes
Depressor structure coiling hotspot temperature rise and in terms of be not properly suited for using natural esters insulating oil as cooling medium
Tractive transformer.The compound wire of existing winding as shown in Figure 1, the compound wire by multiple flat copper single condctors 01 along flat copper
The thickness direction of single condctor 01 stacks, and one layer of insulation is wrapped up in the outside of each flat copper single condctor 01, heap poststack, then
In whole one layer of insulation of external package, the compound wire of an entirety is formed, the winding as made of the compound wire coiling produces
Raw heat can not cause coiling hotspot temperature rise higher by natural esters insulating oil quick conductive.
In conclusion how to reduce the temperature rise of tractive transformer, become those skilled in the art's urgent problem to be solved.
Utility model content
In view of this, being led the purpose of this utility model is to provide a kind of natural esters insulating oil tractive transformer with reducing
Draw the temperature rise of transformer.
In order to achieve the above objectives, the utility model the following technical schemes are provided:
A kind of natural esters insulating oil tractive transformer, including the coil as made of compound wire coiling, the compound wire
It is composed of multiple row single condctor, each column includes multiple single condctors of identical quantity, along the cross of the single condctor
The width direction in section is column, and the outside of each single condctor is enclosed with the first insulating layer, all the single condctor
Integral outer after combination is enclosed with second insulating layer, and the length of the cross section of each single condctor is less than original flat copper list
The length of the cross section of core conducting wire.
Preferably, in above-mentioned natural esters insulating oil tractive transformer, each column single condctor of the compound wire
Integral outer is also enclosed with third insulating layer.
Preferably, in above-mentioned natural esters insulating oil tractive transformer, first insulating layer, the second insulating layer
It is insulating paper with the third insulating layer.
Preferably, in above-mentioned natural esters insulating oil tractive transformer, first insulating layer, the second insulating layer
Thickness with the third insulating layer is 0.1mm~0.3mm.
Preferably, in above-mentioned natural esters insulating oil tractive transformer, the compound wire is as described in two column to four column
Single condctor is composed.
Preferably, in above-mentioned natural esters insulating oil tractive transformer, the quantity of the single condctor in each column is
Two to four.
Preferably, in above-mentioned natural esters insulating oil tractive transformer, the coil includes the low-voltage line being coaxially arranged
Circle and high-tension coil, the low-voltage coil are sheathed in the high-tension coil, and the both ends of the low-voltage coil are covered with different respectively
Type insulator spacer, each allotype insulation separator include:
Annular insulation basin, the annular insulation basin cover at one end of the low-voltage coil, the basin of the annular insulation basin
Wall is isolated between the low-voltage coil and the high-tension coil；
The end of the annular insulation basin, and the position of lifting one's head of the corresponding low-voltage coil is arranged in disrance sleeve, described
Lifting one's head for low-voltage coil is placed in the disrance sleeve.
Preferably, in above-mentioned natural esters insulating oil tractive transformer, the annular insulation basin and the disrance sleeve
It is an integral molding structure.
Preferably, in above-mentioned natural esters insulating oil tractive transformer, further includes:
Annular insulation support plate, the both ends of the high-tension coil, which are covered each by, is provided with the annular insulating supporting
Plate；
Phase partition is placed between the two neighboring high-tension coil, and the phase partition is fixed on the annular
The outer edge of insulation support plate.
Preferably, in above-mentioned natural esters insulating oil tractive transformer, it is described annular insulation support plate with the phase
The outer edge that spacing board is mutually fixed is provided with the bending edge to bend inwards, and the phase partition is fixed on the bending edge.
Preferably, in above-mentioned natural esters insulating oil tractive transformer, the annular insulation support plate and the abnormal shape
The material of insulator spacer is insulating paper.
Compared with prior art, the utility model has the beneficial effects that
In natural esters insulating oil tractive transformer provided by the utility model, compound wire combined by multiple row single condctor and
At the first insulating layer is wrapped up in the outside of each single condctor, and the integral outer after whole single condctor combinations is enclosed with second
Insulating layer, and the length of the cross section of each single condctor is less than the length of the cross section of original flat copper single condctor.In phase
Under conditions of duty ratio, the compound wire in the utility model reduces the axial dimension of single condctor, that is, reduces single
The length of the cross section of conducting wire, it therefore reduces the outside leakage field of the long side of single condctor from cross section, that is, reduce single condctor
Lateral leakage field, reduce the lateral eddy-current loss of transformer winding end on the basis of not increasing cost, reduce winding
Temperature rise of hot spot.
In an embodiment of the present invention, the both ends of low-voltage coil are covered with allotype insulation separator, each abnormal shape respectively
Insulator spacer includes annular insulation basin and disrance sleeve, and annular insulation basin covers at one end of low-voltage coil, and annular insulation
The surrounding tub wall of basin is isolated between low-voltage coil and high-tension coil, and the correspondence low-voltage line of annular insulation basin is arranged in disrance sleeve
The position of the end of circle lifted one's head, lifting one's head for low-voltage coil are placed in disrance sleeve.Due to low-voltage coil end and high-tension coil
End is isolated by allotype insulation separator, thus it is guaranteed that the iron core of low-voltage coil lifted one's head be located at outside low-voltage coil
Between there are enough insulation distances, while ensure that along high-tension coil outer surface to low-voltage coil first and last end and high-tension coil
Outer surface ensure that the electric property of natural esters insulating oil tractive transformer to the creepage distance of low-voltage coil lifted one's head.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is the embodiments of the present invention, for those of ordinary skill in the art, without creative efforts, also
Other attached drawings can be obtained according to the attached drawing of offer.
Fig. 1 is the cross-sectional view of compound wire in the prior art；
Fig. 2 is a kind of the transversal of composite wire of natural esters insulating oil tractive transformer provided by the embodiment of the utility model
Face schematic diagram；
Fig. 3 is that a kind of axial cross section one side of something of natural esters insulating oil tractive transformer provided by the embodiment of the utility model shows
It is intended to；
Fig. 4 is a kind of schematic top plan view of natural esters insulating oil tractive transformer provided by the embodiment of the utility model.
Wherein, 01 it is flat copper single condctor, 1 be single condctor, 2 be the first insulating layer, 3 be third insulating layer, 4 is second
Insulating layer, 5 be low-voltage coil, 51 to lift one's head, 6 be high-tension coil, 7 be allotype insulation separator, 71 be annular insulation basin, 72 be
Disrance sleeve, 8 be annular insulation support plate, 9 be phase partition.
Specific embodiment
The core of the utility model reduces tractive transformer there is provided a kind of natural esters insulating oil tractive transformer
Temperature rise.
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
Referring to FIG. 2, the utility model embodiment provides a kind of natural esters insulating oil tractive transformer, including by compound
Coil made of conducting wire coiling, wherein compound wire is composed of multiple row single condctor 1, and each column is multiple by identical quantity
Single condctor 1 stacks, and defining the width direction along the cross section of single condctor 1 is column, and definition is parallel to single condctor 1
Cross section length direction be it is axial, be parallel to the width direction of the cross section of single condctor 1 as laterally；Each single condctor
1 outside is enclosed with the first insulating layer 2, and the integral outer after whole single condctors 1 combine is enclosed with second insulating layer 4, often
The length of the cross section of a single condctor 1 is less than the length of the cross section of original flat copper single condctor 01.
Under conditions of same duty cycle, i.e., the whole axial dimension of compound wire in this application with it is original compound
Under the conditions of the whole axial dimension of conducting wire is similar, the compound wire in the utility model is due to using 1 group of multiple row single condctor
It closes, it therefore reduces the axial dimension of single condctor 1, that is, reduce the length of the cross section of single condctor 1, it therefore reduces
The outside leakage field of the long side of single condctor 1 from cross section reduces the lateral leakage field of single condctor 1, in the base for not increasing cost
The lateral eddy-current loss of transformer winding end is reduced on plinth, reduces coiling hotspot temperature rise, is met and is insulated with natural esters
Oil is the radiating requirements of the tractive transformer of cooling medium.And with existing compound wire by multiple flat copper single condctors 01 along thickness
Degree direction is stacked into comparing, since the single condctor 1 in the utility model uses the combination of multiple row arrangement, when
The quantity of each column single condctor 1 in a certain range when, the compound wire in the application can reduce whole lateral dimension.
Further, in the present embodiment, it is exhausted to be also enclosed with third for the integral outer of each column single condctor 1 of compound wire
Edge layer 3.Each column single condctor 1 is wrapped up entirely through third insulating layer 3, ensure that compound wire is bearing axial compressive force
When it is relatively reliable.
As optimization, in the present embodiment, the first insulating layer 2, second insulating layer 4 and third insulating layer 3 are insulating paper.
Insulating paper package is convenient, it is, of course, also possible to using the insulating layer of other materials.
In the present embodiment, the thickness in monolayer of the first insulating layer 2, second insulating layer 4 and third insulating layer 3 is 0.1mm
~0.3mm.The integral thickness of the external insulation of compound wire is equal to the first insulating layer 2, second insulating layer 4 and third insulating layer
Twice of the sum of 3 thickness.It is illustrated so that the integral thickness of the external insulation of compound wire is 1.5mm as an example, first absolutely
The bilayer thickness of edge layer 2 is 0.3mm, and the bilayer thickness of third insulating layer 3 is 0.3mm, and the bilayer thickness of second insulating layer 4 is
0.45mm, three's sum are equal to the integral thickness of the external insulation of compound wire.
In the present embodiment, compound wire is composed of two column to four column single condctors 1, when compound wire is by two lists
When core conducting wire 1 is composed, the compound wire is compared with original compound wire of same overall dimensions, each single condctor 1
Axial dimension be about flat copper single condctor 01 axial dimension half, which is used to replace winding overhang part
Line cake conducting wire can reduce the lateral eddy-current loss of winding overhang, reduce coiling hot point of transformer temperature rise.Simultaneously because two list cores are led
The sum of axial dimension of line 1 is axially closely sized to original line cake conducting wire, and manufacture is easy, to product duty ratio hardly shadow
It rings.Certainly, compound wire can also by three column, four column or more single condctor 1 be composed, according to the actual situation depending on.
As optimization, in the present embodiment, the quantity of the single condctor 1 in each column is two to four, is provided in Fig. 2
Each column stacks the case where two single condctor 1, passes through Fig. 1 and Fig. 2 comparison, it is known that, in the single condctor 1 with identical quantity
In the case where flat copper single condctor 01, the lateral dimension of the compound wire in the utility model is less than original compound wire
Lateral dimension, to reduce the overall dimensions of transformer.
As shown in Figure 3 and Figure 4, in the present embodiment, the coil of natural esters insulating oil tractive transformer includes coaxially being arranged
Low-voltage coil 5 and high-tension coil 6, low-voltage coil 5 is sheathed in high-tension coil 6, the first and last end of low-voltage coil 5, i.e., up and down two
End is covered with allotype insulation separator 7 respectively, and each allotype insulation separator 7 includes annular insulation basin 71 and disrance sleeve
72, wherein annular insulation basin 71 is peviform structure, and the pelvic surface of sacrum of peviform structure is hollow, whole structure in a ring, annular insulation basin
71 cover at one end of low-voltage coil 5, and the surrounding tub wall of annular insulation basin 71 be isolated from low-voltage coil 5 and high-tension coil 6 it
Between；Disrance sleeve 72 be arranged in the correspondence low-voltage coil 5 of annular insulation basin 71 lift one's head 51 position, low-voltage coil 5 lifts one's head
51 are placed in disrance sleeve 72.
In the natural esters insulating oil tractive transformer, since the end of low-voltage coil 5 and 6 end of high-tension coil pass through abnormal shape
Insulator spacer 7 is isolated, and lifting one's head for low-voltage coil 5 51 is placed in disrance sleeve 72, thus it is guaranteed that low-voltage coil 5 goes out
There are enough insulation distances between first 51 and the iron core outside low-voltage coil 5, while ensure that along 6 appearance of high-tension coil
Face to 5 first and last end of low-voltage coil and 6 outer surface of high-tension coil to low-voltage coil 5 lift one's head 51 creepage distance, ensure that day
The electric property of right ester insulating oil tractive transformer.
In this embodiment, annular insulation basin 71 and disrance sleeve 72 are an integral molding structure, and structural strength is high, certainly, two
Person can also be separable assembled structure.
Further, in the present embodiment, natural esters insulating oil tractive transformer further includes annular insulation support plate 8 and phase
Spacing board 9, wherein annular insulation support plate 8 is placed in the upper and lower ends of the high-tension coil 6；Phase partition 9 is located at adjacent two
Between a high-tension coil 6, two neighboring high-tension coil 6 is isolated, and is fixed on the outer edge of annular insulation support plate 8.Pass through
Annular insulation support plate 8 and phase partition 9 are set, high-tension coil 6 is isolated with external iron yoke up and down, to increase high pressure
The first and last end of coil 6 thereby ensures that the insulation along 6 outer end face of high-tension coil to upper and lower iron yoke to the creepage distance of upper and lower iron yoke
Distance further improves the electric property of natural esters insulating oil tractive transformer.
In the present embodiment, the outer edge fixed with 9 phase of phase partition of annular insulation support plate 8, which is provided with, bends inwards
90 ° of bending edge, phase partition 9 are fixed on bending edge.
As optimization, in the present embodiment, the material of annular insulation support plate 8 and allotype insulation separator 7 is insulation
Paper, annular insulation support plate 8 are insulating paper ring, and allotype insulation separator 7 is by paper pulp one extrusion forming, easy to process, cost
It is low, it is of course also possible to use other isolation materials.
Since the natural esters insulating oil tractive transformer in the utility model increases allotype insulation separator 7, annular absolutely
Edge support plate 8 and phase partition 9 ensure that between inside transformer in the case where not increasing transformer overall dimension
Insulation distance, also ensure coil to the creepage distance of iron core.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
The foregoing description of the disclosed embodiments can be realized professional and technical personnel in the field or using originally practical new
Type.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the present invention will not be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The widest scope consistent with features of novelty.
Claims (11)
1. a kind of natural esters insulating oil tractive transformer, including the coil as made of compound wire coiling, which is characterized in that described
Compound wire is composed of multiple row single condctor (1), and each column includes multiple single condctors (1) of identical quantity, along institute
The width direction of the cross section of single condctor (1) is stated as column, the outside of each single condctor (1) is enclosed with the first insulation
Layer (2), all the integral outer after single condctor (1) combination is enclosed with second insulating layer (4), each single condctor
(1) length of cross section is less than the length of the cross section of original flat copper single condctor (01).
2. natural esters insulating oil tractive transformer according to claim 1, which is characterized in that each column of the compound wire
The integral outer of single condctor (1) is also enclosed with third insulating layer (3).
3. natural esters insulating oil tractive transformer according to claim 2, which is characterized in that first insulating layer (2),
The second insulating layer (4) and the third insulating layer (3) are insulating paper.
4. natural esters insulating oil tractive transformer according to claim 2, which is characterized in that first insulating layer (2),
The thickness of the second insulating layer (4) and the third insulating layer (3) is 0.1mm~0.3mm.
5. natural esters insulating oil tractive transformer according to claim 1, which is characterized in that the compound wire is by two column
It is composed to the four column single condctors (1).
6. natural esters insulating oil tractive transformer according to claim 5, which is characterized in that the single in each column is led
The quantity of line (1) is two to four.
7. natural esters insulating oil tractive transformer according to claim 1-6, which is characterized in that the coil packet
The low-voltage coil (5) and high-tension coil (6) being coaxially arranged are included, the low-voltage coil (5) is sheathed in the high-tension coil (6),
The both ends of the low-voltage coil (5) are covered with allotype insulation separator (7) respectively, and each allotype insulation separator (7) is equal
Include:
Annular insulation basin (71), annular insulation basin (71) cover at one end of the low-voltage coil (5), the annular insulation
The tub wall of basin (71) is isolated between the low-voltage coil (5) and the high-tension coil (6)；
Disrance sleeve (72) is arranged in the end of annular insulation basin (71), and corresponds to lifting one's head for low-voltage coil (5)
(51) lift one's head (51) of position, the low-voltage coil (5) are placed in the disrance sleeve (72).
8. natural esters insulating oil tractive transformer according to claim 7, which is characterized in that annular insulation basin (71)
It is an integral molding structure with the disrance sleeve (72).
9. natural esters insulating oil tractive transformer according to claim 7, which is characterized in that further include:
Annular insulation support plate (8), the both ends of the high-tension coil (6), which are covered each by, is provided with the annular insulating supporting
Plate (8)；
Phase partition (9) is placed between the two neighboring high-tension coil, and the phase partition (9) is fixed on the ring
The outer edge of shape insulation support plate (8).
10. natural esters insulating oil tractive transformer according to claim 9, which is characterized in that the annular insulating supporting
The edge of plate (8) mutually fixed with the phase partition (9) is provided with the bending edge to bend inwards, and the phase partition (9) is solid
Due on the bending edge.
11. natural esters insulating oil tractive transformer according to claim 9, which is characterized in that the annular insulating supporting
The material of plate (8) and the allotype insulation separator (7) is insulating paper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821451153.8U CN208478109U (en) | 2018-09-05 | 2018-09-05 | Natural esters insulating oil tractive transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821451153.8U CN208478109U (en) | 2018-09-05 | 2018-09-05 | Natural esters insulating oil tractive transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208478109U true CN208478109U (en) | 2019-02-05 |
Family
ID=65208693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821451153.8U Active CN208478109U (en) | 2018-09-05 | 2018-09-05 | Natural esters insulating oil tractive transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208478109U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109759673A (en) * | 2019-03-12 | 2019-05-17 | 西安西电变压器有限责任公司 | The welding method of transformer copper shielding |
-
2018
- 2018-09-05 CN CN201821451153.8U patent/CN208478109U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109759673A (en) * | 2019-03-12 | 2019-05-17 | 西安西电变压器有限责任公司 | The welding method of transformer copper shielding |
| CN109759673B (en) * | 2019-03-12 | 2021-11-02 | 西安西电变压器有限责任公司 | Welding method for transformer copper shield |
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Address after: 611100, No. 138, West Section of Haike Road, Chengdu Cross Strait Science and Technology Industrial Development Park, Wenjiang District, Chengdu City, Sichuan Province Patentee after: Chengdu Xidian Zhongte Electric Co.,Ltd. Country or region after: China Patentee after: XI'AN XD TRANSFORMER Co.,Ltd. Patentee after: CHINA XD ELECTRIC Co.,Ltd. Address before: 710077 No. 485, Daqing Road, Xi'an, Shaanxi Patentee before: XI'AN XIBIAN ZHONGTE ELECTRIC CO.,LTD. Country or region before: China Patentee before: XI'AN XD TRANSFORMER Co.,Ltd. Patentee before: CHINA XD ELECTRIC Co.,Ltd. |