CN206432126U - A kind of transformer land used screen structure - Google Patents
A kind of transformer land used screen structure Download PDFInfo
- Publication number
- CN206432126U CN206432126U CN201720061585.7U CN201720061585U CN206432126U CN 206432126 U CN206432126 U CN 206432126U CN 201720061585 U CN201720061585 U CN 201720061585U CN 206432126 U CN206432126 U CN 206432126U
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- shading ring
- outside
- copper strips
- ring
- ground
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- 229910052802 copper Inorganic materials 0.000 claims abstract description 47
- 239000010949 copper Substances 0.000 claims abstract description 47
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000000123 paper Substances 0.000 claims description 35
- 239000011111 cardboard Substances 0.000 claims description 29
- 238000009413 insulation Methods 0.000 claims description 28
- 239000000463 material Substances 0.000 claims description 9
- 238000003466 welding Methods 0.000 claims description 8
- 238000010276 construction Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 239000011810 insulating material Substances 0.000 claims description 2
- 238000012360 testing method Methods 0.000 description 8
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 4
- 230000005684 electric field Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Landscapes
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The utility model provides a kind of transformer land used screen structure, the transformer includes at least one set of coil, every group of coil includes the multiple coils being arranged successively, shield describedly in main leakage passage of the structure setting in every group of coil between two coils of arbitrary neighborhood, it includes being set in the forming tube on the outside of corresponding coil, wrap up in ground screen of the system on the outside of forming tube, and be set on forming tube and shield with being located at respectively, two shading rings at lower two ends, respectively upper shading ring and lower shading ring, shield describedly including copper strips, thereon, drawn respectively by ground outlet at lower two ends, and the ground outlet being connected with copper strips upper end and upper shading ring weld after drawn from described the top for shielding structure, the ground outlet being connected with copper strips lower end is welded with lower shading ring.Transformer land used screen structure described in the utility model disclosure satisfy that nothing (low) shelf depreciation requirement of transformer.
Description
Technical field
The utility model is related to transformer technology field, and in particular to a kind of transformer land used screen structure, is particularly suitable for use in
Testing transformer, the transformer of nothing (low) shelf depreciation requirement, and need to protect what is be connected with low voltage winding in transformers other to set
Standby transformer.
Background technology
Power system, industrial and mining enterprises, scientific research department etc. are typically using testing transformer to various high voltage electric equipments, electrical equipment
Element, insulating materials carry out the dielectric(al) test under power frequency or high direct voltage.Testing transformer is a kind of important and expensive
Equipment, when voltage class is higher, the price of its corollary equipment is also higher, therefore protection test transformer and its connection are set
It is standby significant.
The performance of testing transformer can directly affect its result of the test, and one of its important performance is exactly without (low) shelf depreciation
It is required that, i.e., partial discharge quantity is less than 20pC.In order to meet the performance, it is necessary to be set at main leakage passage between transformer coil
Shield structure with putting.
It is formed on however, shielding structure existingly and wrapping up on the stem of iron core, its concrete structure causes it to can be used only in low potential
On, it is impossible to meet nothing (low) shelf depreciation requirement of transformer.
Utility model content
Technical problem to be solved in the utility model is that there is provided one kind for the drawbacks described above in the presence of prior art
It disclosure satisfy that the transformer land used screen structure of nothing (low) shelf depreciation requirement of transformer.
Solving the technical scheme that is used of the utility model technical problem is：
The utility model provides a kind of transformer land used screen structure, and the transformer includes at least one set of coil, every group of line
Circle includes the multiple coils being arranged successively, and main leakage of the structure setting in every group of coil between two coils of arbitrary neighborhood is shielded describedly
In magnet passage, it includes being set in forming tube on the outside of corresponding coil, wraps up in ground screen of the system on the outside of forming tube, and is set in into
It is located on type tube and respectively two shading rings of ground screen upper/lower terminal, respectively upper shading ring and lower shading ring, bag is shielded describedly
Copper strips is included, its upper/lower terminal is drawn by ground outlet respectively, and the ground outlet being connected with copper strips upper end and upper shielding
Boxing is drawn after connecing from described the top for shielding structure, ground outlet be connected with copper strips lower end and the welding of lower shading ring.
Alternatively, the upper shading ring and lower shading ring are the non-close copper ring with opening, and upper shading ring is with
Aperture position on shading ring is symmetrical.
Alternatively, the internal side diameter of the upper shading ring is provided with a notch, and the ground outlet being connected with copper strips upper end is worn
Cross the notch and welded at the notch with upper shading ring.
Alternatively, the outside diameter and internal side diameter of the lower shading ring have a notch, are connected with copper strips lower end
Ground outlet through after the notch of internal side diameter, wind from the inside to the outside lower shading ring one enclose and at the notch of outside diameter with lower screen
Boxing is covered to connect.
Alternatively, structure is shielded describedly also to be included wrapping up in cable paper of the system on the outside of upper and lower shading ring respectively, for by,
Lower shading ring is fixed on forming tube；The forming tube, which is adopted, to be made from an insulative material.
Alternatively, the copper strips includes being sequentially sleeved at the sub- copper strips of a plurality of ring-type outside forming tube from top to bottom, and point
The vertical sub- copper strips not being connected with a plurality of sub- copper strips of ring-type, and the vertical sub- copper strips upper/lower terminal respectively by connecing
Ground lead-out wire is drawn.
Alternatively, shielding describedly also includes conductive paper and two layers of insulating board, and respectively primary insulation cardboard and outer layer is exhausted
Edge cardboard, wherein primary insulation cardboard wrap up in system on the outside of forming tube, and copper strips is set on primary insulation cardboard, and conductive paper is wrapped up in system and existed
On the outside of copper strips, outer layer insulation cardboard wraps up in system on the outside of conductive paper；Primary insulation cardboard, conductive paper, outer layer insulation cardboard are overall
Formula structure, or be to include partially overlapping between the split-type structural of multiple sub-portions, adjacent sub-sections and in overlapping region overlap joint.
Alternatively, also wrapped up between conductive paper and the outer layer insulation cardboard and be formed with oil sealing paper tape, it plays the effect of filling and leading up, with
The outer surface shielded with making and the outer surface of upper and lower shading ring maintain an equal level.
Alternatively, shield describedly structure also include respectively be located at upper shading ring upper end, lower shading ring lower end, and wrap up in system into
Two end circles on the outside of type tube；Described two end circles are made of insulating board.
Alternatively, structure is shielded describedly also to be included wrapping up in screen of the system on the outside of two end circles, two shading rings and ground screens；Institute
State screen and adopt and be made from an insulative material；The screen is monolithic construction, or is to include the split-type structural of multiple sub-portions, phase
Partially overlapped between adjacent sub-portion and in overlapping region overlap joint.
Beneficial effect：
Shield described in the utility modelly in structure, due to being respectively arranged a shading ring in the upper/lower terminal of ground screen, not only
Shield the effect for the uniform end electric field having in itself with further increasing, meet nothing (low) shelf depreciation requirement of transformer,
It is avoided that overvoltage present in transformer high-voltage coil is delivered on low-voltage coil again, and low-voltage coil is connected with generator,
Therefore it can also play to low-voltage coil and its connect the protective effect of equipment.
Brief description of the drawings
The schematic top plan view for the ground screen structure that Fig. 1 provides for the utility model embodiment；
The partial sectional view in the ground screen structure upper region that Fig. 2 provides for the utility model embodiment；
Fig. 3 is the partial schematic diagram in screen structure upper region as shown in Figure 1；
Fig. 4 is the partial schematic diagram in screen structure bottom region as shown in Figure 1.
In figure：1- forming tubes；The upper shading rings of 2A-；Shading ring under 2B-；3A- upper ends are enclosed；4- copper strips；5- is conductive
Paper；6A- primary insulation cardboards；6B- outer layer insulation cardboards；7- screens；8- ground outlets；9- ground outlets top
Lift one's head.
Embodiment
To make those skilled in the art more fully understand the technical solution of the utility model, with reference to the accompanying drawings and examples
The utility model is described in further detail.
It should be appreciated that in the utility model, term " on " refer to top pointed in Fig. 2-4, term " under "
Refer to lower section pointed in Fig. 2-4.
The utility model embodiment provides a kind of transformer land used screen structure, and it is applied to testing transformer, without (low) office
The transformer that portion's electric discharge is required, and need to protect the transformer for the miscellaneous equipment being connected with low voltage winding in transformers, also fit certainly
For other kinds of oil-filled transformer.The transformer includes at least one set of coil, and every group of coil includes what is be arranged successively
Multiple coils.In order to meet nothing (low) shelf depreciation requirement of transformer, that is, partial discharge quantity is met less than 20pC, it is necessary to every
One ground screen structure is set in the main leakage passage in group coil between two coils of arbitrary neighborhood.For example, one group of coil includes three
The individual coil being arranged successively, is followed successively by inner coil, intermediate coil and outer coil from the inside to the outside, then ground screen structure both can be with
It is located in the main leakage passage between inner coil and intermediate coil, is now set in the outside of inner coil；It can also be located at
In main leakage passage between intermediate coil and outer coil, the outside of intermediate coil is now set in.
As Figure 1-4, structure is shielded describedly for modular construction, it includes being set in the forming tube on the outside of corresponding coil
1st, ground screen of the system in the outside of forming tube 1 is wrapped up in, and is set on forming tube 1 and shields with being located at respectively two of upper/lower terminal
The shading ring of shielding action, respectively upper shading ring 2A and lower shading ring 2B, ground screen plays a part of uniform end electric field, and it is wrapped
Copper strips 4 is included, the upper/lower terminal of copper strips 4 is drawn by ground outlet 8 respectively, and connecing for (as welded) is connected with the upper end of copper strips 4
Ground lead-out wire 8 and upper shading ring 2A is drawn after being welded using scolding tin from the top of entirely screen structure, is connected with the lower end of copper strips 4
The ground outlet 8 and lower shading ring 2B of (as welded) is welded using scolding tin.Wherein, forming tube 1 can be adopted and is made from an insulative material；
Ground outlet 8 can be made of existing brush wire.
In the present embodiment, upper shading ring 2A and lower shading ring 2B can be the non-close copper ring with opening, and upper screen
The aperture position covered on ring 2A and lower shading ring 2B is symmetrical, to play more preferable shielding action.Certainly, the two shading rings also may be used
Using other materials, other shapes, only need to have shielded performance.
As shown in figure 3, upper shading ring 2A internal side diameter is provided with a notch (not shown because blocking in figure), with copper strips 4
The ground outlet 8 of upper end connection using scolding tin is welded through the notch and with upper shading ring 2A at the notch, i.e. grounding lead
Outlet uses " ten " font welding manner with upper shading ring, and this welding manner causes ground outlet 8 and upper shading ring 2A to weld
Connect firm, surface smooth, be further ensured that partial discharge quantity meets requirement, and ground outlet 8 passes through the part after the notch
Extension is continued up, its top is that ground outlet top lifts one's head 9.
(do not show because blocking in figure as shown in figure 4, lower shading ring 2B outside diameter and internal side diameter have a notch
Go out), i.e. the notch of the notch of outside diameter and internal side diameter, the ground outlet 8 being connected with the lower end of copper strips 4 initially passes through the groove of internal side diameter
Mouthful, the notch of outside diameter is then passed through, is enclosed so as to wind lower shading ring 2B mono- from the inside to the outside, then at the notch of outside diameter with
Shading ring 2B is welded using scolding tin, i.e. ground outlet uses "T"-shaped welding manner with lower shading ring, and this welding manner causes
Ground outlet 8 and lower shading ring 2B firm weldings, surface are smooth, are further ensured that partial discharge quantity meets requirement.
As shown in Fig. 2 shielding structure describedly also includes wrapping up in electricity of the system on the outside of upper shading ring 2A and lower shading ring 2B respectively
Cable paper (is not marked) in figure, for upper shading ring 2A and lower shading ring 2B to be fixed on into forming tube 1.
In the present embodiment, 0.13mm cable paper can be used, is rolled into upper shading ring 2A and lower shading ring after two layers respectively
2B is fixed on forming tube 1.Need to be because upper shading ring 2A and lower shading ring 2B shield upper/lower terminal with being located at respectively, therefore only
Cable paper processed is wrapped up in the outside of forming tube 1 at ground screen upper/lower terminal position, without wrapping up in system in the outside of whole forming tube 1
Cable paper.(alternatively referred to as cable insulating paper) is material commonly used in the art moreover, cable paper, thus the present embodiment to its specification no longer
Repeat.
Understood with reference to Fig. 2-4, copper strips 4 includes being sequentially sleeved at the sub- copper strips of a plurality of ring-type outside forming tube 1 from top to bottom,
The vertical sub- copper strips being connected respectively with the sub- copper strips of a plurality of ring-type, and the upper/lower terminal of vertical sub- copper strips passes through grounding lead respectively
Outlet 8 is drawn.Wherein, need to be spaced pre-determined distance between the sub- copper strips of adjacent ring-type, the specific size as spacing distance can be by
Those skilled in the art are set according to actual conditions.Certainly, copper strips 4 can also use other structures and shape, this practicality
It is new that this is not construed as limiting.
As shown in Fig. 2 ground screen also includes conductive paper 5 and two layers of insulating board, respectively primary insulation cardboard 6A and outer layer
Insulating board 6B, wherein primary insulation cardboard 6A wrap up in system in the outside of forming tube 1, and copper strips 4 is set on primary insulation cardboard 6A, led
Electric paper 5 wraps up in system in the outside of copper strips 4, and outer layer insulation cardboard 6B wraps up in system in the outside of conductive paper 5.Wherein, conductive paper and insulating board are
Material commonly used in the art, therefore the present embodiment is repeated no more to its specification.
Oil sealing paper tape (not marked in figure) is formed with as shown in Fig. 2 also being wrapped up between conductive paper 5 and outer layer insulation cardboard 6B, its
The effect of filling and leading up is played, so that the outer surface of ground screen and the outer surface of upper and lower shading ring maintain an equal level.
In the present embodiment, can roll tightly and fill and lead up in ground screen using 0.3mm oil sealing paper tape, so as not to the outer surface of ground screen with
There is difference in height in the outer surface of upper and lower shading ring.
It can be seen that, the cable paper of the 0.13mm in ground screen, primary insulation cardboard 6A, conductive paper 5,0.3mm oil sealing paper tape and
Outer layer insulation cardboard 6B, wraps up in system in the outside of forming tube 1 being sheathed on corresponding coil, rather than will entirely shield successively from inside to outside
Structure is overall after carrying out to be set on corresponding coil, therefore described shields structure for modular construction.
It is located at upper shading ring 2A upper ends, lower shading ring 2B lower ends respectively as shown in Fig. 2 shielding structure describedly and may also include,
And two end circles of the system in the outside of forming tube 1 are wrapped up in, 3A and lower end turn (not shown) are enclosed in respectively upper end, with circumferentially positioned two
Individual shading ring, it is to avoid it misplaces or sunk.Two end circles can be made of insulating board.
In addition, as shown in Fig. 2 shielding structure describedly may also include the system wrapped up in outside two end circles, two shading rings and ground screens
The screen 7 of side.Screen 7 can be adopted and is made from an insulative material, and played a part of insulating and protected.
In the present embodiment, when coil diameter is smaller, it can be monolithic construction that each Rotating fields in structure are shielded describedly；
, can be by described a part of layer shielded in structure due to being limited by material or process equipment when coil diameter is larger
Structure point valve makes, and is broken generally into two valves, naturally it is also possible to be divided into more valves, for example, primary insulation cardboard 6A, conductive paper 5, outer
Layer insulating board 6B, screen 7, which are used, to be included partially overlapping between the split-type structural of multiple sub-portions, adjacent sub-sections and is overlapping
Region is overlapped.
The processing method for shielding structure described in the present embodiment is explained in detail below：
S101. described the skeleton for shielding structure, i.e. forming tube are made by design drawing.The internal diameter of forming tube 1 should be greater than phase
The external diameter of coil is answered, so as to be arranged on the coil.
S102. upper shading ring and lower shading ring are respectively sleeved on forming tube, and adjusted to relevant position, then at this
Two layers of 0.13mm of system cable paper is wrapped up on the outside of two shading rings, so that upper shading ring and lower shading ring are fixed on forming tube.
Before two shading rings are sheathed on forming tube, a notch need to be opened in the internal side diameter of upper shading ring, under
The internal side diameter and outside diameter of shading ring respectively open a notch.
S103. each Rotating fields in shielding with wrapping up in system successively on the outside of forming tube, between two shading rings.
Specifically, first on the outside of forming tube, primary insulation cardboard processed is wrapped up between two shading rings, then copper strips is set in
On primary insulation cardboard.Now, ground outlet is respectively welded in the upper/lower terminal of copper strips, makes and connecing that copper strips upper end is welded
Ground lead-out wire passes through the notch of upper shading ring internal side diameter, and is welded at the notch with upper shading ring, and makes and copper strips lower end
The ground outlet of welding sequentially passes through the notch of lower shading ring internal side diameter and the notch of outside diameter, so that under winding from the inside to the outside
Shading ring one is enclosed, and is welded at the notch of outside diameter with lower shading ring.Then system is wrapped up in successively between two shading rings conductive
Paper, 0.3mm oil sealing paper tape, outer layer insulation cardboard.
S104. system one is wrapped up on the outside of the forming tube of upper shading ring upper end and on the outside of the forming tube of lower shading ring lower end respectively
End circle.
S105. screen processed is wrapped up on the outside of two end circles, two shading rings and ground screens, and wraps up in consolidation processed.
In summary, structure and its processing method that structural change is traditionally shielded are shielded described in the present embodiment, is not only entered
One step shields the effect for the uniform end electric field having in itself with improving, and meets nothing (low) shelf depreciation requirement of transformer, again
It is avoided that overvoltage present in transformer high-voltage coil is delivered on low-voltage coil, and low-voltage coil is connected with generator, because
This can also play to low-voltage coil and its connect the protective effect of equipment.
It is understood that embodiment of above be merely to illustrate that principle of the present utility model and use it is exemplary
Embodiment, but the utility model is not limited thereto.For those skilled in the art, this is not being departed from
In the case of the spirit and essence of utility model, various changes and modifications can be made therein, and these variations and modifications are also considered as this reality
With new protection domain.
Claims (10)
1. a kind of transformer land used screen structure, the transformer includes at least one set of coil, every group of coil includes what is be arranged successively
Multiple coils, it is characterised in that shield main leakage of the structure setting in every group of coil between two coils of arbitrary neighborhood describedly and lead to
In road, it includes being set in forming tube on the outside of corresponding coil, wraps up in ground screen of the system on the outside of forming tube, and is set in forming tube
Two shading rings that are upper and being located at ground screen upper/lower terminal respectively, respectively upper shading ring and lower shading ring, shield including copper describedly
Band, its upper/lower terminal is drawn by ground outlet respectively, and the ground outlet being connected with copper strips upper end and upper shielding boxing
Drawn after connecing from described the top for shielding structure, ground outlet be connected with copper strips lower end and the welding of lower shading ring.
2. shield structure according to claim 1ly, it is characterised in that the upper shading ring and lower shading ring are to have to open
The non-close copper ring of mouth, and the aperture position on upper shading ring and lower shading ring is symmetrical.
3. shield structure according to claim 2ly, it is characterised in that the internal side diameter of the upper shading ring is provided with a groove
Mouthful, the ground outlet being connected with copper strips upper end is welded through the notch and with upper shading ring at the notch.
4. shield structure according to claim 2ly, it is characterised in that outside diameter and the internal side diameter difference of the lower shading ring
A notch is provided with, the ground outlet being connected with copper strips lower end is passed through after the notch of internal side diameter, lower shield is wound from the inside to the outside
Ring one is enclosed and welded at the notch of outside diameter with lower shading ring.
5. shield structure according to claim 1ly, it is characterised in that shield describedly structure also include wrapping up in respectively system it is upper,
Cable paper on the outside of lower shading ring, for upper and lower shading ring to be fixed on into forming tube；The forming tube uses insulating materials system
Into.
6. shield structure according to claim 1ly, it is characterised in that the copper strips includes being sequentially sleeved at into from top to bottom
The sub- copper strips of a plurality of ring-type outside type tube, and the vertical sub- copper strips being connected respectively with a plurality of sub- copper strips of ring-type, and it is described perpendicular
The upper/lower terminal of straight sub- copper strips is drawn by ground outlet respectively.
7. the ground screen structure according to any one of claim 1-6, it is characterised in that shield describedly also include conductive paper and
Two layers of insulating board, respectively primary insulation cardboard and outer layer insulation cardboard, wherein primary insulation cardboard wrap up in system outside forming tube
Side, copper strips is set on primary insulation cardboard, and conductive paper wraps up in system on the outside of copper strips, and outer layer insulation cardboard wraps up in system outside conductive paper
Side；Primary insulation cardboard, conductive paper, outer layer insulation cardboard are monolithic construction, or are to include the split type knot of multiple sub-portions
Partially overlapped between structure, adjacent sub-sections and in overlapping region overlap joint.
8. shield structure according to claim 7ly, it is characterised in that also wrapped up between conductive paper and the outer layer insulation cardboard
Oil sealing paper tape is formed with, it plays the effect of filling and leading up, so that the outer surface of ground screen and the outer surface of upper and lower shading ring maintain an equal level.
9. shield structure according to claim 1ly, it is characterised in that shielding structure describedly also includes being located at upper shielding respectively
Ring upper end, lower shading ring lower end, and wrap up in two end circles of the system on the outside of forming tube；Described two end circles use insulating board system
Into.
10. shield structure according to claim 9ly, it is characterised in that shielding structure describedly also includes wrapping up in system at two ends
Screen on the outside of circle, two shading rings and ground screen；The screen, which is adopted, to be made from an insulative material；The screen is monolithic construction,
Or be to include partially overlapping between the split-type structural of multiple sub-portions, adjacent sub-sections and in overlapping region overlap joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720061585.7U CN206432126U (en) | 2017-01-18 | 2017-01-18 | A kind of transformer land used screen structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720061585.7U CN206432126U (en) | 2017-01-18 | 2017-01-18 | A kind of transformer land used screen structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206432126U true CN206432126U (en) | 2017-08-22 |
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ID=59584071
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720061585.7U Expired - Fee Related CN206432126U (en) | 2017-01-18 | 2017-01-18 | A kind of transformer land used screen structure |
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| Country | Link |
|---|---|
| CN (1) | CN206432126U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022061601A1 (en) * | 2020-09-23 | 2022-03-31 | Siemens Gas And Power Gmbh & Co. Kg | Shielding device for an coil of transformer |
-
2017
- 2017-01-18 CN CN201720061585.7U patent/CN206432126U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022061601A1 (en) * | 2020-09-23 | 2022-03-31 | Siemens Gas And Power Gmbh & Co. Kg | Shielding device for an coil of transformer |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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