CN215377227U - Electrode structure of direct-current supporting capacitor - Google Patents
Electrode structure of direct-current supporting capacitor Download PDFInfo
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- CN215377227U CN215377227U CN202121772801.1U CN202121772801U CN215377227U CN 215377227 U CN215377227 U CN 215377227U CN 202121772801 U CN202121772801 U CN 202121772801U CN 215377227 U CN215377227 U CN 215377227U
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Abstract
The utility model discloses an electrode structure of a direct-current support capacitor, which mainly comprises a core rod, a first T-shaped high square resistance safety film, a second reticular safety film, a first gold spraying layer, a second gold spraying layer and an outer coating film, wherein the first T-shaped high square resistance safety film comprises a first base film and a first evaporation coating layer, the first evaporation coating layer comprises an edge thickened area, a first insulating gap strip, a first fuse, a second insulating gap strip and a middle screen band, and the second reticular safety film comprises a second base film and a second evaporation coating layer. The second evaporation layer is composed of an edge screen band, a third insulation gap strip, a second fuse, a fourth insulation gap strip, a fifth insulation gap strip and a middle thickened area. The utility model has simple structure and convenient manufacture, and can meet the requirement of high-long-term safe and reliable operation of the direct current support capacitor.
Description
Technical Field
The utility model belongs to the technical field of capacitor design, and particularly relates to a direct-current supporting capacitor electrode structure.
Background
The direct current support capacitor is a key device of the converter, and plays roles in stabilizing voltage, filtering and the like on a direct current side in the converter. At present, high-power converters such as high-voltage frequency converters of dozens of megawatts, high-speed motor car converters, high-power STATCOM, direct-current capacitors for flexible direct-current transmission engineering and the like need to use high-voltage large-capacity direct-current supporting capacitors.
These dc support capacitors are metallized polypropylene film capacitors, which are also gradually adopting dry structure and decreasing in size, and the operating field strength of the metallized polypropylene film is gradually increased. The common characteristics of the capacitors are high voltage, large capacity and heavy weight, and the DC support capacitor core is composed of at most 300 elements. If 1 element fails, the reliability of the whole capacitor is affected. Thus, the safety reliability of such capacitors is increasingly required.
Currently, there are 2 types of internal electrode structures of such capacitors: an external series connection; are connected in series internally.
At present, the electrode structure forms are as follows: (1) a metal layer high sheet resistance structure; (2) metal layer safety type grid structure. Characteristics of the metallized film of type 1: the evaporation square resistance can be 15-60 Ω/□, and the working field intensity can be increased to more than 250V/mum, so that the size of the capacitor is greatly reduced; when the final fault fails, the capacity is reduced to a few percent, and the capacitor has a short-circuit state, which cannot meet the requirements of destructive tests in IEC 61071-2017 and GB/T17702-2013 that the final capacity of the sample capacitor is reduced to 90 percent of the original value. Characteristics of the 2 nd metallized film: the length of the fuse is less than 1mm, the evaporation square resistance can be 7-15 Ω/□, the capacity is reduced to a few percent when the final fault fails, and the capacitor has an 'open circuit state', thereby meeting the requirements of related destructive tests in IEC 61071-; the working field intensity is up to 210V/mum, and the size of the capacitor is larger.
Therefore, new electrode technologies are needed to improve the working field strength, safety and reliability of the capacitor.
Disclosure of Invention
In order to overcome the technical defects of the conventional direct current support capacitor electrode structure, the utility model provides a direct current support capacitor electrode structure.
The technical scheme adopted by the utility model is as follows.
The utility model provides a direct current support capacitor electrode structure which mainly comprises a core rod, a first T-shaped high-sheet-resistance safety film, a second layer of meshed safety film, a first gold spraying layer, a second gold spraying layer and an outer wrapping film. And a first layer of T-shaped high-sheet-resistance safety film and a second layer of reticular safety film are wound on the mandrel. The first layer of T-shaped high-sheet-resistance safety film and the second layer of meshed safety film are overlapped together after being staggered for a certain distance. The first gold spraying layer and the second gold spraying layer are respectively connected with two ends of the first layer of T-shaped high-sheet-resistance safety film and respectively used as a positive pole and a negative pole. The outer wrapper film is interposed between the first and second layers of high sheet resistance security film and is wrapped together and outermost.
The first layer of T-shaped high-sheet-resistance safety film consists of a first base film and a first evaporation coating. The first evaporation coating layer is composed of an edge thickening area, a first insulation gap strip, a first fuse, a second insulation gap strip and a middle screen band. The edge thickening area is horizontally connected with the first insulation gap strips and the first fuse, the upper edge of each first insulation gap strip is overlapped with the lower edge of the edge thickening area, the first fuse is arranged between the two first insulation gap strips, the second insulation gap strips are sequentially connected with the first insulation gap strips and the middle screen belt to form a plurality of small parallelogram areas, and the middle screen belt divides the first evaporation layer into an upper part and a lower part which are symmetrical in structure.
The second layer of the reticular safety film consists of a second base film and a second evaporation coating. The second evaporation layer is composed of an edge screen band, a third insulation gap strip, a second fuse, a fourth insulation gap strip, a fifth insulation gap strip and a middle thickened area. The edge screen band is horizontally connected with the plurality of third insulation gap strips, the second fuse and the fourth insulation gap strips are sequentially connected to form a net shape, the fourth insulation gap strips are sequentially connected with the second fuse and the fifth insulation gap strips, and the fifth insulation gap strips are vertically connected with the middle thickened area. The middle thickened area divides the second evaporation layer into an upper part and a lower part which are symmetrical in structure.
After the first layer of T-shaped high-sheet-resistance safety film and the second layer of meshed safety film are overlapped, the middle screen belt is overlapped with the middle thickened area, the first evaporation coating layer and the second evaporation coating layer are separated for the second time, and the first evaporation coating layer and the second evaporation coating layer are equivalent to a 2-string structure. Each series is provided with a plurality of small capacitors which are connected in parallel; the first insulation gap strip, the first fuse, the second insulation gap strip, the third insulation gap strip, the second fuse, the fourth insulation gap strip and the fifth insulation gap strip form a small capacitor.
Furthermore, the first gold spraying layer and the second gold spraying layer can also be used as the negative pole and the positive pole of the direct current support capacitor.
The core rod is made of polycarbonate material, the diameter of the core rod is 9mm, the core rod is of a cylindrical structure, and a 6-angle through hole is formed in the core rod and can resist the high temperature of 120 ℃.
The first basal membrane is a high-temperature-resistant polypropylene film for electrician, and the working temperature is 110 ℃ at most.
The second basal membrane is a high-temperature-resistant polypropylene film for electrician, and the working temperature is 110 ℃ at most.
The outer packaging film material is a polypropylene film for packaging, and is usually 12-15 circles.
The first gold spraying layer and the second gold spraying layer are made of zinc or a composite material.
The width of the edge thickening region is 3mm, the square resistance value of the evaporated metal layer is 2 (1-3) Ω/□, and the material is zinc-aluminum alloy.
The width of the first insulation gap strip is 2.5mm, the length of the first insulation gap strip is 8mm, and the two ends of the first insulation gap strip are circular arcs.
The width of the first fuse is 2.5mm, the length of the first fuse is 3mm, the square resistance value of the evaporated metal layer is 2 (1-3) Ω/□, and the material of the first fuse is zinc-aluminum alloy.
The width of the second insulating gap strip is 1 mm.
The width of the middle screen band is 5 mm.
The width of the edge screen band is 2.5-3 mm.
The width of the third insulating gap strip is 0.5mm and the third insulating gap strip is V-shaped.
The second fuse has a width of 0.5mm and a length of 0.5 mm.
The width of the fourth insulating gap strip is 0.5mm and is X-shaped.
The width of the fifth insulating gap strip is 0.5mm, and the strip is double-Y-shaped.
The width of the middle thickening region is 5mm, the square resistance value of the evaporated metal layer is 3 (2-4) Ω/□, and the material is zinc-aluminum alloy.
Further, the first deposition layer has 2 edge thickened regions.
Furthermore, except for the edge thickening region and the first fuse, the metal layer evaporated by the first evaporation layer has a square resistance value of 35 (30-50) Ω/□, a thickness of less than 100nm, and is made of zinc-aluminum alloy.
Furthermore, the first insulating gap strips are parallel to the middle screen band, and the second insulating gap strips and the middle screen band have an inclination angle of 75-80 degrees.
Furthermore, the second evaporation layer has 2 edge strips, except for the middle edge strip and the middle thickening region, the square resistance value of the evaporation metal layer is 10 (8-12) Ω/□, the thickness of the evaporation metal layer is less than 100nm, and the evaporation metal layer is made of zinc-aluminum alloy.
Further, the width of the first base film is 2mm longer than that of the second base film, the first base film and the second base film are made of the same material, and the thickness of the first base film is 0.5-1.5 mu m thinner than that of the second base film.
The utility model has the beneficial effects that: by combining the advantages of the high sheet resistance metallized film and the traditional safety film, the electrode structure can improve the working field intensity of the capacitor, reduce the size of the capacitor and reduce the capacity to be less than 5 percent of the original value.
The utility model has simple structure and convenient manufacture, and can meet the requirement of high-long-term safe and reliable operation of the direct current support capacitor.
Drawings
FIG. 1 is a schematic view of the present invention;
FIG. 2 is a top view of a first layer of T-shaped high sheet resistance security film;
FIG. 3 is a side view of a first layer of a T-shaped high sheet resistance rupture film;
FIG. 4 is a top view of a second layer of a reticulated security film;
FIG. 5 is a side view of a second layer of a reticulated security film;
FIG. 6 is a schematic view showing the first T-shaped high sheet resistance security film and the second mesh security film being laminated;
FIG. 7 is an equivalent circuit diagram of the present invention;
in the figure, 1-core rod; 2-a first layer of T-shaped high sheet resistance safety film; 3-a second layer of a reticulated security film; 4-a first gold-sprayed layer; 5-a second gold spraying layer; 6-external wrapping film
21-a first base film; 22-first deposition layer;
31-a second base film; 32-second deposition layer;
221-edge thickening region; 222-first insulating gap strips; 223-a first fuse; 224-a second insulating gap strip; 225-middle screen band;
321-edge screen band; 322-third insulating gap bar; 323-second fuse; 324-a fourth insulating gap bar; 325-fifth insulating gap strip; 326-middle thickened region.
Detailed Description
The utility model is further described with reference to the following figures and specific examples.
In fig. 1 can be seen: the direct-current supporting capacitor electrode structure mainly comprises a core rod (1), a first T-shaped high-sheet-resistance safety film (2), a second reticular safety film (3), a first gold-spraying layer (4), a second gold-spraying layer (5) and an outer wrapping film (6); a first layer of T-shaped high-sheet-resistance safety film (2) and a second layer of reticular safety film (3) are wound on the core rod (1); the first layer of T-shaped high-sheet-resistance safety film (2) and the second layer of meshed safety film (3) are overlapped together after being staggered for a certain distance; the first gold spraying layer (4) and the second gold spraying layer (5) are respectively connected with two ends of the first T-shaped high square resistance safety film (2) and respectively used as a positive pole and a negative pole; the outer wrapper (6) is interposed between the first (2) and second (3) layers of high-sheet-resistance security film and is wound together and outermost.
As can be seen in fig. 2 and 3: the first layer of T-shaped high-sheet-resistance safety film (2) is composed of a first base film (21) and a first evaporation layer (22); the first evaporation layer (22) is composed of an edge thickened area (221), a first insulation gap strip (222), a first fuse (223), a second insulation gap strip (224) and a middle screen band (225); the edge thickening region (221) is connected with the first insulation gap strips (222) and the first fuse level (223), the upper edge of each first insulation gap strip (222) is overlapped with the lower edge of each edge thickening region (221), the first fuse (223) is arranged between the two first insulation gap strips (221), the second insulation gap strips (224) are sequentially connected with the first insulation gap strips (222) and the middle screen band (225) to form a plurality of small parallelogram regions, and the middle screen band (225) divides the first evaporation layer (22) into an upper part and a lower part which are symmetrical in structure.
As can be seen in fig. 4 and 5: the second layer of the reticular safety film (3) consists of a second base film (31) and a second evaporation layer (32); the second evaporation layer (32) is composed of an edge screen band (321), a third insulating gap strip (322), a second fuse wire (323), a fourth insulating gap strip (324), a fifth insulating gap strip (325) and a middle thickened area (326); the edge screen band (321) is horizontally connected with a plurality of third insulating gap strips (322), the second fuse wire (323) and the fourth insulating gap strips (324) are sequentially connected to form a net shape, the fourth insulating gap strips (324) are sequentially connected with the second fuse wire (323) and the fifth insulating gap strips (325), and the fifth insulating gap strips (325) are vertically connected with the middle thickened area (326); the intermediate thickened region (326) divides the second deposited layer (32) into upper and lower portions which are structurally symmetrical.
As can be seen from fig. 6: after the first layer of T-shaped high-sheet-resistance security film (2) and the second layer of meshed security film (3) are overlapped, the middle screen band (225) is overlapped with the middle thickened area (326), the first evaporation layer (22) and the second evaporation layer (32) are separated for the second time, and the two layers are equivalent to a 2-string structure; each series is provided with a plurality of small capacitors which are connected in parallel; the first insulation gap strip (222), the first fuse (223), the second insulation gap strip (224), the third insulation gap strip (322), the second fuse (323), the fourth insulation gap strip (324) and the fifth insulation gap strip (325) form a small capacitor.
As can be seen from fig. 7: the first gold spraying layer (4) and the second gold spraying layer (5) can be used as the positive pole and the negative pole of the direct current support capacitor; the first gold spraying layer (4) and the second gold spraying layer (5) can also be used as the negative pole and the positive pole of the direct current support capacitor.
The core rod (1) is made of a polycarbonate material, has a diameter of 9mm, is of a cylindrical structure, is internally provided with a 6-angle through hole, and can resist the high temperature of 120 ℃.
The first base film (21) is a high-temperature-resistant polypropylene film for electrician, and the working temperature is 110 ℃ at most.
The second basal membrane (22) is a high-temperature-resistant polypropylene film for electrician, and the working temperature is 110 ℃ at most.
The outer wrapping film (6) is a polypropylene film for packaging, and is usually 12-15 circles.
The first gold spraying layer (4) and the second gold spraying layer (5) are made of zinc or a composite material.
The width of the edge thickening region (321) is 3mm, the square resistance value of the evaporated metal layer is 2 (1-3) Ω/□, and the material is zinc-aluminum alloy.
The first insulating gap stripe (222) has a width of 2.5mm, a length of 8mm, and circular arc-shaped ends.
The width of the first fuse (223) is 2.5mm, the length thereof is 3mm, the square resistance value of the evaporated metal layer is 2 (1-3) Ω/□, and the material thereof is zinc-aluminum alloy.
The width of the second insulating gap strip (224) is 1 mm.
The width of the middle screen band (225) is 5 mm.
The width of the edge screen band (321) is 2.5-3 mm.
The width of the third insulating gap strip (322) is 0.5mm and is V-shaped.
The second fuse wire (323) has a width of 0.5mm and a length of 0.5 mm.
The fourth insulating gap strip (324) has a width of 0.5mm and is X-shaped.
The fifth insulating gap strip (325) has a width of 0.5mm and is double-Y-shaped.
The width of the middle thickened area (326) is 5mm, the square resistance value of the evaporated metal layer is 3 (2-4) Ω/□, and the material is zinc-aluminum alloy.
Further, the first deposition layer (22) has 2 edge thickened regions (221).
Furthermore, except for the edge thickening region (221) and the first fuse (223), the first evaporation layer 22) has a metal layer square resistance value of 35 (30-50) Ω/□, a thickness of less than 100nm, and is made of zinc-aluminum alloy.
Furthermore, the first insulating gap strips (222) are parallel to the middle screen band (225), and the second insulating gap strips (224) have an inclined angle with the middle screen band, wherein the inclined angle is 75-80 degrees.
Furthermore, the second evaporation layer (32) has 2 edge strips (321), except the middle edge strip (321) and the middle thickening region (326), the square resistance value of the evaporation metal layer is 10 (8-12) Ω/□, the thickness of the evaporation metal layer is less than 100nm, and the evaporation metal layer is made of zinc-aluminum alloy.
Further, the first base film (21) is 2mm longer than the second base film (31) in width, the first base film and the second base film are made of the same material, and the first base film (21) is 0.5-1.5 mu m thinner than the second base film (31).
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A kind of direct current supports the capacitor electrode structure, its characteristic is: the electrode structure mainly comprises a core rod, a first T-shaped high square resistance safety film, a second reticular safety film, a first gold spraying layer, a second gold spraying layer and an outer wrapping film, wherein the first T-shaped high square resistance safety film and the second reticular safety film are wound on the core rod, the first T-shaped high square resistance safety film and the second reticular safety film are overlapped after being staggered for a certain distance, the first gold spraying layer and the second gold spraying layer are respectively connected with two ends of the first T-shaped high square resistance safety film and respectively serve as a positive pole and a negative pole, and the outer wrapping film is inserted between the first T-shaped high square resistance safety film and the second reticular safety film, is wound together and is arranged on the outermost side;
the first layer of T-shaped high-sheet-resistance safety film consists of a first base film and a first evaporation layer, the first evaporation layer consists of an edge thickened area, first insulation gap strips, a first fuse, second insulation gap strips and a middle screen band, the edge thickened area, the first insulation gap strips and the first fuse are horizontally connected, the upper edge of each first insulation gap strip is overlapped with the lower edge of the edge thickened area, the first fuse is arranged between the two first insulation gap strips, the second insulation gap strips are sequentially connected with the first insulation gap strips and the middle screen band to form a plurality of small parallelogram areas, and the middle screen band divides the first evaporation layer into an upper part and a lower part which are symmetrical in structure;
the second layer of the reticular safety film consists of a second base film and a second evaporation coating, the second evaporation coating consists of an edge screen band, a third insulating gap strip, a second fuse, a fourth insulating gap strip, a fifth insulating gap strip and a middle thickened area, the edge screen band is horizontally connected with a plurality of third insulating gap strips, the third insulating gap strip, the second fuse and the fourth insulating gap strip are sequentially connected to form a net shape, the fourth insulating gap strip is sequentially connected with the second fuse and the fifth insulating gap strip, the fifth insulating gap strip is vertically connected with the middle thickened area, and the middle thickened area divides the second evaporation coating into an upper part and a lower part which are symmetrical in structure;
after the first layer of T-shaped high-sheet-resistance safety film and the second layer of meshed safety film are overlapped, the middle screen belt and the middle thickened area are overlapped, and then the first evaporation layer and the second evaporation layer are separated for the second time and are equivalent to form a 2-string structure.
2. The dc-supported capacitor electrode structure of claim 1, wherein: the width of the first insulation gap strip is 2.5mm, the length of the first insulation gap strip is 8mm, and two ends of the first insulation gap strip are arc-shaped.
3. The dc-supported capacitor electrode structure of claim 1, wherein: the width of the first fuse is 2.5mm, the length of the first fuse is 3mm, the mean value of the square resistance of the evaporated metal layer is 2 Ω/□, and the first fuse is made of zinc-aluminum alloy.
4. The dc-supported capacitor electrode structure of claim 1, wherein: the width of the third insulating gap strip is 0.5mm and the third insulating gap strip is V-shaped.
5. The dc-supported capacitor electrode structure of claim 1, wherein: the width of the fourth insulating gap strip is 0.5mm and is X-shaped.
6. The dc-supported capacitor electrode structure of claim 1, wherein: the width of the fifth insulating gap strip is 0.5mm, and the fifth insulating gap strip is double-Y-shaped.
7. The dc-supported capacitor electrode structure of claim 1, wherein: the mean value of the sheet resistance of the metal layer evaporated by the first evaporation layer is 35 Ω/□, the thickness of the metal layer is less than 100nm, and the metal layer is made of zinc-aluminum alloy.
8. The dc-supported capacitor electrode structure of claim 1, wherein: the mean value of the sheet resistance of the metal layer evaporated by the second evaporation layer is 10 Ω/□, the thickness of the metal layer is less than 100nm, and the metal layer is made of zinc-aluminum alloy.
9. The dc-supported capacitor electrode structure of claim 1, wherein: the width of the first base film is 2mm longer than that of the second base film, the first base film and the second base film are made of the same material, and the thickness of the first base film is 0.5-1.5 mu m thinner than that of the second base film.
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| CN202121772801.1U CN215377227U (en) | 2021-08-02 | 2021-08-02 | Electrode structure of direct-current supporting capacitor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022083797A3 (en) * | 2021-08-02 | 2022-06-09 | 无锡市电力滤波有限公司 | Electrode structure for dc link capacitor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022083797A3 (en) * | 2021-08-02 | 2022-06-09 | 无锡市电力滤波有限公司 | Electrode structure for dc link capacitor |
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