CN213546144U - Element for DC support capacitor - Google Patents
Element for DC support capacitor Download PDFInfo
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- CN213546144U CN213546144U CN202022884594.0U CN202022884594U CN213546144U CN 213546144 U CN213546144 U CN 213546144U CN 202022884594 U CN202022884594 U CN 202022884594U CN 213546144 U CN213546144 U CN 213546144U
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Abstract
The utility model discloses a direct current supports component for condenser, the component mainly comprises the plug, the rupture membrane is hindered to the first layer high side, the rupture membrane is hindered to the second floor high side, outer covering film and gold spraying layer constitute, the rupture membrane is hindered to the first layer high side of coiling on the plug and the rupture membrane is hindered to the second floor high side, outer covering film is in the component outermost, the gold spraying layer hinders the rupture membrane with the first layer high side and links together, the rupture membrane is hindered by first base film to the first layer high side, first coating by vaporization layer constitutes, first coating by edge thickened area, first insulation clearance strip, first fuse, second insulation clearance strip, the second fuse, middle screen band constitutes, the rupture membrane is hindered by the second base film to the second floor high side, second coating by the third insulation clearance strip, the third fuse, the fourth insulation clearance strip, edge screen band constitutes. The utility model discloses simple structure, in the aspect of the preparation, can satisfy the high long-term fail safe nature operation of direct current support capacitor.
Description
Technical Field
The utility model belongs to the technical field of capacitor element designs, concretely relates to direct current supports component for condenser.
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 films. In addition, the capacitors are also gradually adopting a dry structure and the working field intensity of the metallized polypropylene film is gradually increased with the decrease of the size. 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.
At present, the structure of the internal element of the capacitor has 2 forms: 2 elements are externally connected in series; 1 element internal 2 are connected in series.
Currently, the metallized films of the components are: (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; the final failure is actually reduced by a few percent, the capacitor is in a short-circuit state, and 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 cannot be met. 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/□, finally the failure actual time is reduced by a few percent, 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 device technologies are needed to improve the operating field strength, safety, and reliability of the capacitor.
Disclosure of Invention
In order to overcome the technical defect of the elements of the prior direct current supporting capacitor, the utility model provides an element for a direct current supporting capacitor.
The utility model adopts the following technical proposal.
The utility model provides a direct current supports component for capacitor, the component mainly comprises plug, first layer height square resistance rupture membrane, second floor height square resistance rupture membrane, outer envelope and the metal spraying layer. And winding a first layer of high sheet resistance safety film and a second layer of high sheet resistance safety film on the mandrel. The first layer of high square resistance safety film and the second layer of high square resistance safety film are overlapped together after being staggered for a certain distance. The overwrap film is interposed between the first and second high sheet resistance films and wrapped together, outermost the element. The gold spraying layer is connected with the first layer of high sheet resistance safety film.
The first layer of 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, a second fuse and a middle screen band. The edge thickening area is horizontally connected with the first insulation gap strips and the first fuses, the first fuses are arranged between the first insulation gap strips, the second insulation gap strips are connected with the first insulation gap strips and the middle screen belt, the second fuses are arranged between the second insulation gap strips, and the middle screen belt divides the first evaporation layer into an upper part and a lower part.
The second layer of high sheet resistance safety film consists of a second base film and a second evaporation coating. The second evaporation layer is composed of a third insulation gap strip, a third fuse, a fourth insulation gap strip and an edge screen band. And a third fuse is arranged between the third insulating gap strips, and the fourth insulating gap strip is connected with the third insulating gap strips and the edge screen band.
After the first layer of high sheet resistance safety film and the second layer of high sheet resistance safety film are overlapped, the edges of the middle screen belt and the third insulating gap edge are overlapped, the first evaporation coating and the second evaporation coating are separated for the second time, the original 1-size parallelogram coating is divided into 1-size parallelogram coating and 1-size parallelogram coating, and the middle screen belt enables the element to be in a 1-2 internal string structure.
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 up to 105 ℃.
The second basal membrane is a high-temperature-resistant polypropylene film for electrician, and the working temperature is up to 105 ℃.
The outer packaging film material is a polypropylene film for packaging, and usually 10-15 circles.
The metal spraying layer is made of zinc.
The width of the edge thickening region is 2.5mm, 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 6mm, 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 2.5mm, 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 second fuse has a width of 1mm and a length of 1 mm.
The width of the middle screen band is 5 mm.
The width of the third insulating gap strip is 1.5mm, and the length of the third insulating gap strip is 11 mm.
The third fuse has a width of 1.5mm and a length of 11 mm.
The width of the fourth insulating gap strip is 1 mm.
The width of the edge screen band is 2.5-3 mm.
Further, the diameter of the element is usually 60-80 mm, which depends on the thickness of the first and second layers of high sheet resistance safety film and the capacitance to be produced.
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 30 (25-50) 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, the square resistance value of the evaporation metal layer is 30 (25-50) Ω/□, the thickness is less than 100nm, and the material is zinc-aluminum alloy.
Furthermore, the third insulating gap strip is parallel to the edge screen band, and an inclined angle is formed between the fourth insulating gap strip and the edge screen band, and the value of the inclined angle is 75-80 degrees.
Furthermore, the parallel distance of the third insulating gap bars of the second evaporation layer is 5 mm.
Furthermore, the width of the first base film is 2mm longer than that of the second base film, the thickness and the material of the first base film and the second base film are the same, and the first base film and the second base film can have different thicknesses under special operating conditions.
Further, the third fuse and the first fuse are longer, and the third fuse is longer.
The utility model has the advantages that: by combining the advantages of the high square resistance metallized film and the traditional safety film, the novel element can reach the working field intensity of the capacitor to 230V/mum, the size of the capacitor is reduced, and the capacity can be reduced to below 10% of the original value.
The utility model discloses simple structure, in the aspect of the preparation, can satisfy the high long-term fail safe nature operation of 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 high sheet resistance security film;
FIG. 3 is a side view of a first layer of high sheet resistance security film;
FIG. 4 is a top view of a second layer of high sheet resistance rupture film;
FIG. 5 is a side view of a second layer of high sheet resistance rupture film;
FIG. 6 is a schematic view showing the first high sheet resistance security film and the second high sheet resistance security film being laminated;
in the figure, 1-core rod; 2-a first layer of high sheet resistance security film; 3-a second layer of high sheet resistance safety film; 4-wrapping the membrane; 5-spraying a gold layer;
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-second fuse; 226-middle screen band;
321-third insulating gap strips; 322-third fuse; 323-fourth insulating gap strips; 324-edge screen band.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
In FIG. 1, it can be seen that the element for the direct current support capacitor is mainly composed of a core rod (1), a first layer of high sheet resistance safety film (2), a second layer of high sheet resistance safety film (3), an outer coating film (4) and a metal spraying layer (5); a first layer of high sheet resistance safety film (2) and a second layer of high sheet resistance safety film (3) are wound on the mandrel (1); the first layer of high square resistance safety film (2) and the second layer of high square resistance safety film (3) are overlapped together after being staggered for a certain distance; the outer wrapping film (4) is inserted between the first high-square-resistance security film (2) and the second high-square-resistance security film (3) and is wound together, and is arranged on the outermost side of the element; the gold spraying layer (5) is connected with the first layer of high sheet resistance safety film (2).
As can be seen in fig. 2 and 3: the first layer of 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), a second fuse (225) and a middle screen band (226); the first deposition layer (22) has 2 edge thickened regions (221); the edge thickening region (221) is horizontally connected with the first insulation gap strips (222) and the first fuse (223), the first fuse (223) is arranged between the first insulation gap strips (222), the second insulation gap strips (224) are connected with the first insulation gap strips (222) and the middle screen band (226), the second fuse (225) is arranged between the second insulation gap strips (224), and the middle screen band (226) divides the first evaporation layer (22) into an upper part and a lower part; the first insulating gap strips (222) are parallel to the middle screen band (226), and the second insulating gap strips (224) have an inclination angle with the middle screen band, wherein the inclination angle is 75-80 degrees.
As can be seen in fig. 4 and 5: the second layer of high sheet resistance safety film (3) consists of a second base film (31) and a second evaporation layer (32); the second evaporation layer (32) is composed of a third insulation gap strip (321), a third fuse (322), a fourth insulation gap strip (323) and an edge screen band (324); the second deposition layer (32) has 2 edge strips (324); third fuses (322) are arranged among the third insulating gap strips (321), and fourth insulating gap strips (323) are connected with the third insulating gap strips (321) and the edge screen band (324); the third insulating gap strip (321) is parallel to the edge screen band (324), and an angle between the fourth insulating gap strip (323) and the edge screen band has an inclination angle of 75-80 degrees; the parallel distance of the third insulating gap bars (321) is 5 mm.
As can be seen from fig. 6: the width of the first layer of high sheet resistance safety film (2) is 2mm longer than that of the second layer of high sheet resistance safety film (3); after the first layer of high-square-resistance safety film (2) and the second layer of high-square-resistance safety film (3) are overlapped, the edges of the middle screen belt (226) and the third insulating gap strip (321) are overlapped, the first evaporation coating (22) and the second evaporation coating (32) are separated for the second time, the original 1-size parallelogram coating is divided into 1-size parallelogram coating and 1-size parallelogram coating, and the middle screen belt (226) enables 1-2 inner string structure to be formed; the third fuse (323) and the first fuse (223) are both longer in length, with the third fuse (323) being longer.
The width of the edge thickening region (221) is 2.5mm, and the square resistance of the evaporated metal layer is 2 (1-3) Ω/□.
The first insulating gap stripe (222) has a width of 2.5mm, a length of 6mm, and circular arc shapes at both ends.
The width of the first fuse (223) is 2.5mm, the length thereof is 2.5mm, and the square resistance value of the evaporated metal layer is 2 (1-3) Ω/□.
The width of the second insulating gap strip (224) is 1 mm.
The second fuse (225) has a width of 1mm and a length of 1 mm.
The width of the middle screen band (226) is 5 mm.
The width of the third insulating gap strip (321) is 1.5mm, and the length of the third insulating gap strip is 11 mm.
The third fuse (322) has a width of 1.5mm and a length of 11 mm.
The width of the fourth insulating gap strip (323) is 1 mm.
The width of the edge screen band (324) is 2.5-3 mm.
Except for the edge thickening region (221) and the first fuse (223), the resistance value of the metal layer evaporated by the first evaporation layer (22) is 30 (25-50) Ω/□, the thickness of the metal layer is less than 100nm, and the metal layer is made of zinc-aluminum alloy.
The resistance value of the metal layer evaporated by the second evaporation layer (32) is 30 (25-50) Ω/□, the thickness of the metal layer is less than 100nm, and the metal layer is made of zinc-aluminum alloy.
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 should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. An element for a DC support capacitor, comprising: the element mainly comprises a core rod, a first layer of high-square-resistance safety film, a second layer of high-square-resistance safety film, an outer wrapping film and a gold spraying layer, wherein the core rod is wound with the first layer of high-square-resistance safety film and the second layer of high-square-resistance safety film, the first layer of high-square-resistance safety film and the second layer of high-square-resistance safety film are overlapped together after being staggered for a certain distance, the outer wrapping film is arranged on the outermost side of the element, the gold spraying layer is connected with the first layer of high-square-resistance safety film, the first layer of high-square-resistance safety film is composed of a first base film and a first evaporation layer, the first evaporation layer is composed of an edge thickened area, a first insulation gap strip, a first fuse wire, a second insulation gap strip, a second fuse wire and a middle screen belt, the edge thickened area is horizontally connected with the first insulation gap strip and the first fuse wire, the first insulation gap strip is arranged between the second insulation gap strip, the first insulation gap strip, the second insulation gap strip, The middle screen band is connected, the second fuse is between two second insulation gap strips, middle screen band divides into two parts from top to bottom to first coating by vaporization layer, the high sheet resistance rupture film in second floor comprises second base film, second coating by vaporization layer, the second coating by vaporization layer comprises third insulation gap strip, third fuse, fourth insulation gap strip, edge screen band, the third fuse is between two third insulation gap strips, fourth insulation gap strip and third insulation gap strip, edge screen band are connected.
2. The element for a direct current support capacitor according to claim 1, characterized in that: the width of the first insulation gap strip is 2.5mm, the length of the first insulation gap strip is 6mm, and two ends of the first insulation gap strip are arc-shaped.
3. The element for a direct current support capacitor according to claim 1, characterized in that: the width of the first fuse is 2.5mm, the length of the first fuse is 2.5mm, the square resistance of the evaporated metal layer is 2 omega/□, and the first fuse is made of zinc-aluminum alloy.
4. The element for a direct current support capacitor according to claim 1, characterized in that: the resistance value of the metal layer evaporated by the first evaporation layer is 30 omega/□, the metal layer is made of zinc-aluminum alloy, and the edge thickening area and the first fuse are excluded.
5. The element for a direct current support capacitor according to claim 1, characterized in that: the width of the third insulating gap strip is 1.5mm, and the length of the third insulating gap strip is 11 mm.
6. The element for a direct current support capacitor according to claim 1, characterized in that: the third fuse has a width of 1.5mm and a length of 11 mm.
7. The element for a direct current support capacitor according to claim 1, characterized in that: the second evaporation layer is provided with two edge screen belts, the square resistance value of the evaporation metal layer is 30 omega/□, and the material of the second evaporation layer is zinc-aluminum alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022884594.0U CN213546144U (en) | 2020-12-06 | 2020-12-06 | Element for DC support capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022884594.0U CN213546144U (en) | 2020-12-06 | 2020-12-06 | Element for DC support capacitor |
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| Publication Number | Publication Date |
|---|---|
| CN213546144U true CN213546144U (en) | 2021-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022884594.0U Active CN213546144U (en) | 2020-12-06 | 2020-12-06 | Element for DC support capacitor |
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|---|---|
| CN (1) | CN213546144U (en) |
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- 2020-12-06 CN CN202022884594.0U patent/CN213546144U/en active Active
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