CN218826664U - High-voltage alternating current capacitor - Google Patents
High-voltage alternating current capacitor Download PDFInfo
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- CN218826664U CN218826664U CN202320116701.6U CN202320116701U CN218826664U CN 218826664 U CN218826664 U CN 218826664U CN 202320116701 U CN202320116701 U CN 202320116701U CN 218826664 U CN218826664 U CN 218826664U
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Abstract
The utility model discloses a high voltage alternating current capacitor belongs to electrical equipment technical field. The high-voltage alternating-current capacitor is made into a core in a winding mode, the capacitance value is doubled compared with that of a flat laying mode, and the volume can be effectively reduced; the capacitor units are connected in series by the metal electrodes, so that the structure is very compact, the occupied space is small, the overall dimension is favorably reduced, and the influence of stray capacitance and the interference of an external electric field are reduced; the first double-sided metalized film and the second double-sided metalized film are both metalized films, have the characteristics of self-healing and insulation recovery immediately when the films are broken down, and can effectively eliminate insulation failure caused by weak point breakdown or partial discharge breakdown of the films so as to ensure the working stability and reliability of the capacitor.
Description
Technical Field
The utility model relates to an electrical equipment technical field especially relates to a high voltage alternating current capacitor.
Background
In order to realize the primary and secondary integration in a feeder line, a column switch and a ring main unit of a power distribution network of a power system, an alternating current capacitive voltage sensor and a power supply are researched and applied, and the equipment needs a high-voltage alternating current capacitor which is small in appearance size, good in insulating property and large enough in capacitance value as a voltage dividing capacitor or a power supply capacitor. The capacitor has the advantages of working reliability and stability, and can meet the requirement of measuring accuracy of a voltage sensor or the requirement of outputting certain power by a power supply to drive the switching equipment to act. The existing high-voltage alternating-current capacitor has the problems of large volume or small capacitance, poor overvoltage resistance, easy influence of stray capacitance on the accuracy of a voltage sensor formed by the capacitor, external electric field interference and the like, and is not suitable for being applied to the equipment. Therefore, it is necessary to reduce the size of the capacitor, improve the insulating property and the stability and reliability of the capacitor, and reduce the interference and influence of the external electric field on the measurement accuracy, so as to meet the use requirements of the ac capacitive voltage sensor and the power supply of the power distribution network.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a high-pressure alternating-current capacitor, the volume of reducible condenser improves the stability and the reliability of work.
In order to achieve the above object, the utility model provides a following scheme:
a high voltage ac capacitor, comprising: a core;
the first double-sided metalized film, the first insulating dielectric film, the second double-sided metalized film and the second insulating dielectric film are sequentially laminated, combined and wound into the core from top to bottom;
strip-shaped metal electrodes which are arranged at intervals are arranged on the upper surface and the lower surface of the first double-sided metalized film and the second double-sided metalized film respectively;
the strip-shaped metal electrodes of the first double-sided metalized film and the second double-sided metalized film are arranged in a staggered mode to form a plurality of series capacitor units with the same overlapping area between the electrodes.
According to the utility model provides a concrete embodiment, the utility model discloses a following technological effect:
the utility model discloses a high-voltage alternating current capacitor, which is made into a core by adopting a winding mode, the capacitance value is doubled compared with that of a tiling mode, and the volume can be effectively reduced; the capacitor units are connected in series by the metal electrodes, so that the structure is very compact, the occupied space is small, the overall size is favorably reduced, and the influence of stray capacitance and the interference of an external electric field are reduced; the first double-sided metalized film and the second double-sided metalized film are both metalized films, have the characteristics of self-healing and insulation recovery immediately when the films are broken down, and can effectively eliminate insulation failure caused by weak point breakdown or partial discharge breakdown of the films so as to ensure the working stability and reliability of the capacitor.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
Fig. 1 is a schematic winding diagram of a high voltage ac capacitor core according to an embodiment of the present invention;
fig. 2 is a schematic view of a stacked assembly of high voltage ac capacitor materials according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a high-voltage ac capacitor provided in an embodiment of the present invention.
Description of the symbols: 1-core, 2-core rod, 3-first double-sided metalized film, 4-first insulating dielectric film, 5-second double-sided metalized film, 6-second insulating dielectric film, 7-first layer electrode, 8-third layer electrode, 9-second layer electrode, 10-fourth layer electrode, 11-upper connecting terminal, 12-shell, 13-insulating resin and 14-lower connecting terminal.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
To the deficiency of the prior art, the utility model provides a through rational design's simple structure, overall dimension is little, simple to operate, reliable and stable's high voltage alternating current capacitor (hereinafter referred to as "condenser"). The utility model forms strip-shaped metal electrodes with equal space and same width along the length direction of a film roll on the upper and lower surfaces of a film (called as a basal film) by vacuum evaporation respectively, and the positions of the strip-shaped metal electrodes on the upper and lower surfaces are respectively arranged in the space of the opposite electrode; the film with the strip-shaped metal electrodes plated on both sides is called a double-sided metalized film with strip-shaped electrodes arranged at intervals (hereinafter referred to as a metalized film); in addition, the capacitor also employs a thin film (referred to as an "insulating dielectric film") without a metal electrode; the two layers of metallized films are overlapped according to the designed dislocation, and the middle of each two layers of metallized films is separated by a layer of insulating dielectric film, and then the materials are combined and wound into a cylindrical core 1; the metal electrodes are connected in series in the capacitor, so that the capacitor is very compact in structure, small in occupied space and beneficial to reduction of volume; the base film of the metallized film and the insulating dielectric film between the metallized films have good insulating performance, and the whole capacitor can bear higher voltage through the serial connection of tens of capacitor units.
Referring to fig. 1, the present invention provides a high voltage ac capacitor.
A high voltage AC capacitor includes: a core 1. The first double-sided metallized film 3, the first insulating dielectric film 4, the second double-sided metallized film 5 and the second insulating dielectric film 6 are sequentially laminated, combined and wound into the core 1 from top to bottom. The upper and lower surfaces of the first double-sided metalized film 3 and the second double-sided metalized film 5 are provided with strip-shaped metal electrodes which are arranged at intervals. The strip-shaped metal electrodes of the first double-sided metallized film 3 and the second double-sided metallized film 5 are arranged in a staggered mode to form a plurality of series capacitor units with the same overlapping area between the electrodes.
As shown in fig. 1, in the present embodiment, each layer of the stacked assembly is disposed toward the length direction of the stripe electrodes.
Specifically, the first double-sided metallized film 3 includes: the device comprises a base film and a plurality of strip-shaped metal electrodes which are arranged on the upper surface and the lower surface of the base film at equal intervals along the length direction of a film roll; the position of the lower surface strip-shaped metal electrode of the first double-sided metallized film 3 is arranged in the interval of the upper surface strip-shaped metal electrode. In fact, the second double-sided metallized film 5 is a metallized film identical to the first double-sided metallized film 3, and the first double-sided metallized film 3 is turned over by 180 ° in both the width direction and the thickness direction, so that the second double-sided metallized film 5 is obtained.
I.e. the first double-sided metallization is thin: the upper surface of the base film is provided with a first layer of strip-shaped metal electrodes which are arranged at intervals, the lower surface of the base film is provided with a second layer of strip-shaped metal electrodes which are arranged at intervals, and the second layer of strip-shaped metal electrodes are arranged in the interval of the first layer of strip-shaped metal electrodes 7 which are opposite. Second double-sided metallized film 5: the upper surface of the base film is provided with a third layer of strip-shaped metal electrodes which are arranged at intervals, the lower surface of the base film is provided with a fourth layer of strip-shaped metal electrodes which are arranged at intervals, and the fourth layer of strip-shaped metal electrodes are arranged in the interval of the opposite third layer of strip-shaped metal electrodes.
As shown in fig. 2, the left edge of the first double-sided metalized film 3 is staggered a than the left edges of the first insulating dielectric film 4, the second double-sided metalized film 5 and the second insulating dielectric film 6 by a film edge, so as to meet the process requirement of metal-spraying connection of the metal-plated electrode at the end part of the winding body. In order to facilitate the metal spraying of the end part of the capacitor and to extend the creepage distance between the edge electrodes, the width of the strip-shaped metal electrode at the leftmost edge of the upper surface of the first double-sided metalized film 3 is a + σ + β, and the widths of the strip-shaped metal electrodes other than the strip-shaped metal electrode at the leftmost edge of the upper surface of the first double-sided metalized film 3 are all a; the sigma is set to meet the technological requirement of metal spraying connection of the metal coating electrode at the end of the winding body, and the beta is the edge widening value of the metallized film to prolong the creepage distance of the edge and improve the insulating performance of the end of the capacitor.
The right side edge of the second double-sided metalized film 5 is staggered by sigma to the right beyond the right side edge of the first double-sided metalized film 3, the first insulating dielectric film 4 and the second insulating dielectric film 6 along the width direction, so that the process requirement of metal spraying and connecting of the metal coating electrode at the end part of the winding body is met. The strip-shaped metal electrodes are arranged at the right edge of the lower surface of the second double-sided metalized film 5 in the width direction, the width of the strip-shaped metal electrode at the rightmost edge of the lower surface of the second double-sided metalized film 5 is a + σ + β, and the widths of the strip-shaped metal electrodes except the strip-shaped metal electrode at the rightmost edge of the lower surface of the second double-sided metalized film 5 are all a.
The first insulating dielectric film 4 and the second insulating dielectric film 6 are both films without metal plating, have the same size, are narrower than the first double-sided metalized film 3 and the second double-sided metalized film 5 by σ (σ is referred to as film edge misalignment), and are made of the same material as the base film of the metalized film.
The upper surface strip-shaped metal electrode of the first double-sided metalized film 3 is a first layer electrode 7, the lower surface strip-shaped metal electrode of the first double-sided metalized film 3 is a second layer electrode 9, the upper surface strip-shaped metal electrode of the second double-sided metalized film 5 is a third layer electrode 8, and the lower surface strip-shaped metal electrode of the second double-sided metalized film 5 is a fourth layer electrode 10.
An overlapped area separated by the base film of the first double-sided metallized film 3 and the first insulating dielectric film 4 exists between the first layer electrode 7 and the third layer electrode 8, and the overlapped area of each pair of the first layer electrode 7 and the third layer electrode 8 forms a first capacitor unit.
An overlapped area separated by the first insulating dielectric film 4 exists between the second layer electrode 9 and the third layer electrode 8, and the overlapped area of each pair of the second layer electrode 9 and the third layer electrode 8 forms a second capacitance unit.
An overlapped area separated by the first insulating dielectric film 4 and the base film of the second double-sided metallized film 5 exists between the second layer electrode 9 and the fourth layer electrode 10, and the overlapped area of each pair of the second layer electrode 9 and the fourth layer electrode 10 forms a third capacitance unit.
Between the first layer electrode 7 and the fourth layer electrode 10, there is an overlapped area separated by the base film of the first double-sided metallized film 3, the first insulating dielectric film 4 and the base film of the second double-sided metallized film 5, and the overlapped area of each pair of the first layer electrode 7 and the fourth layer electrode 10 constitutes a fourth capacitance unit.
The effective areas of the first capacitor unit, the second capacitor unit, the third capacitor unit and the fourth capacitor unit are the same, but the number of insulating medium layers between the electrodes is different, so that the capacitances of the capacitor units formed by the first capacitor unit, the second capacitor unit, the third capacitor unit and the fourth capacitor unit are also different.
The capacitance value of the capacitor unit is calculated by the following formula:
C i ＝2Kε 0 ε f S/d i
wherein i =1,2,3,c 1 Is the capacitance of the second capacitive unit, C 2 Is the capacitance of the first or third capacitor unit, C 3 Is the capacitance of the fourth capacitive unit; k is the winding coefficient of the capacitor core 1; epsilon 0 Is a vacuum dielectric constant; epsilon f Winding system for winding capacitor core 1The composite dielectric constant of the interpolar dielectric under the condition of several K; d i Is the total thickness of the dielectric between the electrodes in the capacitor unit;
s is the effective area of the capacitor cell, S = b × L.
Wherein b is the width of the capacitor unit, and L is the length of the capacitor unit.
As can be seen from the above formula, because of the K, ε of each capacitor unit 0 、ε r Same as S, cell capacitance C i Total thickness d of the medium between the electrodes i In inverse proportion.
Because the internal capacitance units are all connected in series, when alternating voltage U is applied to two ends of the capacitor, the calculation formula of the distributed voltage on the capacitance units is as follows:
U i ＝CU/C i
in the formula of U i C is the capacitance of the entire capacitor, and U is the ac voltage applied across the capacitor.
It can be seen that the alternating voltage U applied across the capacitor is in terms of the capacitance of the capacitor unit C i Are distributed in inverse proportion on the respective capacitive units.
The areas S of the overlapped parts between the electrodes are the same, and the electric field intensity E on each capacitor unit medium i The calculation formula of (A) is as follows:
E i ＝E i ＝U i /(d i /K)＝K(CU/C i )/d i
mixing the above C i Substituting the expression of (a) to obtain: e i ＝CU/2ε 0 ε f S。
After the technical requirements of the capacitor, the material and the manufacturing process of the capacitor are determined, K, C, U and epsilon 0 、ε f And S are both constant values, so that the electric field intensity E on the medium of each capacitor unit i Theoretically, the electric field intensity E on each capacitor unit medium is also constant, as can be seen from the above formula i And C i And d i Independently, i.e. whether or not it is C 1 、C 2 Or C 3 The electric field strength over the medium is the same. According to this conclusion, S is controlled, i.e. controlled, whenever it is manufacturedThe deviation of the width b of the corresponding electrode overlapping area is made, so that the difference of the electric field strength on each capacitor unit medium can be reduced, the working field strength is carefully selected during design, sufficient margin is left, the insulating property of the capacitor can be ensured, and the working stability and reliability of the capacitor can be improved.
C above 2 、C 1 、C 2 、C 3 Four capacitor units are connected in series by metal electrodes in sequence and are called C 2 -C 1 -C 2 -C 3 And (4) combining. The utility model discloses form a plurality of C 2 -C 1 -C 2 -C 3 In series combination of capacitor cells according to C 2 -C 1 -C 2 -C 3 —C 2 -C 1 -C 2 -C 3 —…—C 2 -C 1 -C 2 Are connected in series by metallized electrodes, forming the total capacitance C of the capacitor. As can be seen from FIG. 2, in this embodiment, C 2 -C 1 -C 2 -C 3 The combination is repeated in this order and extended to the right to form a plurality of C 2 -C 1 -C 2 -C 3 A series of combinations; at the right end of the core 1, the fourth layer electrode 10 needs to be extended, so the structure is changed, and the capacitor unit series combination at the rightmost side only has C 2 、C 1 And C 2 Three capacitive units.
A C 2 -C 1 -C 2 -C 3 The capacitance value of the series combination of the capacitor units is C ', so the calculation formula of the capacitance value C' of the series combination of the first capacitor unit, the second capacitor unit, the third capacitor unit and the fourth capacitor unit is:
C’＝C 1 C 2 C 3 /(C 2 C 3 +2C 1 C 3 +C 1 C 2 )
the calculation formula of the voltage distributed on C' is:
U C’ ＝CU/C’
the distance between two adjacent strip electrodes on the same layer of the metallized film is C, and the axial voltage on C along the surface of the base film is equal to C 2 -C 1 -C 2 -C 3 Distributed voltage U across a series combination of capacitor units C’ From voltage U C’ Resulting in a surface axial field strength E C’ The calculation formula of (A) is as follows:
E C’ ＝U C’ /c＝CU(C 2 C 3+ 2C 1 C 3+ C 1 C 2 )/(C 1 C 2 C 3 ·c)
in order to avoid corona and flashover between adjacent electrodes in the operating state, the axial field strength E along the surface is increased under the working voltage C’ Is not more than 60V/mm to ensure stability and reliability of capacitor operation.
On the premise of determining the volume of the capacitor, the requirements on the capacitance and the withstand voltage specified by technical conditions can be met by adjusting the width a of the electrodes of the metallized film, the distance c between the strip electrodes on the same layer and the serial number of the capacitance units during design.
The first insulating dielectric film 4 and the second insulating dielectric film 6 are both thin films without metal plating and have the same size. The widths of the first insulating dielectric film 4 and the second insulating dielectric film 6 are staggered sigma compared with the narrow film edge of the first double-sided metalized film 3, and the materials of the first insulating dielectric film 4 and the second insulating dielectric film 6 are the same as those of the base film and are polypropylene films or other insulating films.
In this embodiment, σ is not less than 1mm, and β is not less than 1mm.
The width of the strip-shaped electrode of the metallized film except the electrode with widened edge is set as a, and the value range of a is 3-6 mm, so that enough large capacitance can be formed in a limited volume.
The distance between two adjacent strip electrodes on the same layer of the metallized film is set to be c, and the value range of c is 7-10 mm, so that a large enough creepage distance exists between the electrodes, and the insulation reliability of the capacitor is ensured.
As shown in fig. 1 and 2, in the present embodiment, the capacitor core 1 is formed by continuously winding a laminated combination of a first double-sided metallized film 3, a first insulating dielectric film 4, a second double-sided metallized film 5 and a second insulating dielectric film on a winding machine, and a metal electrode overlapping region is also formed between the previous laminated combination and the next laminated combination, and the capacitor is formed by a width b, so that the total capacitance of the wound core 1 is about 2 times of the calculated capacitance of the laminated layers of the 4 materials, thereby greatly reducing the volume of the capacitor.
In one example, the core 1 further comprises a cylindrical mandrel. The first double-sided metallized film 3, the first insulating dielectric film 4, the second double-sided metallized film 5 and the second insulating dielectric film 6 are sequentially arranged and overlapped according to the position and the size of the figure 2, and then are wound on the mandrel 2 on a special winding machine and are manufactured after process treatment. And spraying gold on both ends of the core 1, thereby leading out both electrodes of the core 1.
As can be seen from fig. 2, in this embodiment, the metal electrodes are connected in series between the capacitor units, the whole capacitor is formed by connecting a plurality of capacitor units in series, the ac voltage applied to the operation and test is shared by the plurality of capacitor units, and the series connection structure enables the capacitor to apply higher operation and test voltages.
In another example, referring to fig. 3, the high voltage ac capacitor further includes: a housing 12. The core is contained within a cylindrical housing 12 of insulating material. A terminal is mounted at each of two axial ends of the housing 12. Two ends of the core 1 are sprayed with gold and then welded with outgoing lines, and the two outgoing lines are respectively connected to two wiring terminals at the end part of the shell 12.
The housing 12 is made of an insulating material, and the material, thickness, external insulation shape and creepage distance thereof are selected according to the technical conditions of the capacitor voltage class, the main insulation requirement, the working environment and the like.
The upper connecting terminal 11 and the lower connecting terminal 14 are made of brass, and can be made into different structural forms according to the use requirement.
The gap between the capacitor case 12 and the core 1 and the gap in the core 1 are filled with a vacuum-cast insulating resin 13 to improve the insulating property of the capacitor.
The utility model has the advantages compared with the prior art:
1. the high-voltage alternating-current capacitor adopts the metalized film as a main functional material, has the characteristics of immediate self-healing and insulation recovery when the film is broken down, can effectively eliminate insulation failure caused by weak point breakdown or partial discharge breakdown of the film, ensures the stability and reliability of the capacitor in work, is favorable for improving the overvoltage-resistant capacity of the capacitor and can reduce the volume of the capacitor. The alternating-current high-voltage capacitor designed and manufactured in the prior art usually uses aluminum foil as an electrode, the electrode has no self-healing function, and the insulation can not be recovered when the capacitor is broken down due to local discharge, dielectric electric weakness and the like under high field intensity, so that the capacitor can break down; and the capacitor with the structure has larger volume and can not meet the use requirement.
2. The first layer and the third layer of metallized film in the laminated combination of the core 1 material of the high-voltage alternating-current capacitor adopt unique double-sided metallized films, the materials, the sizes and the patterns of metal coatings of the first layer and the third layer of metallized film are completely the same, and the materials and the sizes of the second layer and the fourth layer of insulating dielectric films are also completely the same, so that the capacitor adopts only two main functional materials: one is a double-sided metallized film with strip electrodes arranged at intervals, and the other is an insulating dielectric film; compared with other types of metallized film capacitors, the design has the advantages of simplified and compact structure, reduced volume, less material types, greatly reduced number of dies and procedures for electrode evaporation, and obvious economic advantages, and is favorable for generalization and standardization.
3. The voltage born by the high-voltage alternating-current capacitor is shared by dozens of serially connected capacitor units, and the field strengths on the media between the electrodes of all the capacitor units are theoretically equal; the manufacturing deviation is considered in the design, the working field intensity between the electrodes, the axial field intensity along the surface and the creepage distance are reasonably selected, and sufficient margin is reserved, so that the capacitor has good insulating property, and the reliability and the stability of the capacitor in work are ensured.
4. The high-voltage alternating-current capacitor is made into the core 1 in a winding mode, is convenient to manufacture, has a capacitance value doubled compared with that of a flat laying mode, and can effectively reduce the volume.
5. The capacitor units in the high-voltage alternating-current capacitor are connected in series by the metal electrodes inside, so that a plurality of independent capacitor external connection procedures adopted in the prior art and required materials and working hours are omitted, the overall dimension is favorably reduced, and the influence of stray capacitance and the interference of an external electric field are reduced.
To sum up, the utility model discloses a two-sided metallized film with the strip electrode of arranging at the interval, the power system distribution network alternating current capacitance type voltage sensor of manufacturing and get the high-voltage capacitor that needs to use in the electric power, have characteristics such as reasonable in design, insulating properties are good, reliable operation and stability, the condenser is small, and the electric capacity of unit volume is more than one time higher than the condenser that prior art made, simple structure, and the material variety is few, and the process is subtracted and is saved, has good economic nature and practicality.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principle and the implementation of the present invention are explained herein by using specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (10)
1. A high voltage ac capacitor, comprising: a core;
the first double-sided metalized film, the first insulating dielectric film, the second double-sided metalized film and the second insulating dielectric film are sequentially laminated, combined and wound into the core from top to bottom;
strip-shaped metal electrodes arranged at intervals are arranged on the upper surface and the lower surface of the first double-sided metalized film and the second double-sided metalized film respectively;
the strip-shaped metal electrodes of the first double-sided metalized film and the second double-sided metalized film are arranged in a staggered mode to form a plurality of series capacitor units with the same overlapping area between the electrodes.
2. The high voltage ac capacitor of claim 1, wherein said first double-sided metallized film comprises: the device comprises a base film and a plurality of strip-shaped metal electrodes which are arranged on the upper surface and the lower surface of the base film at equal intervals along the length direction of a film roll; the position of the strip-shaped metal electrode on the lower surface of the first double-sided metalized film is arranged in the interval of the strip-shaped metal electrode on the upper surface;
the first double-sided metallized film is turned 180 degrees in both the width direction and the thickness direction ° And finally, obtaining the second double-sided metalized film.
3. The high voltage ac capacitor of claim 2, wherein the left edge of the first double-sided metalized film is offset by a σ to the left beyond the left edges of the first insulating dielectric film, the second double-sided metalized film, and the second insulating dielectric film in the width direction;
the left edge of the upper surface of the first double-sided metalized film along the width direction is a strip-shaped metal electrode, the width of the strip-shaped metal electrode at the leftmost edge of the upper surface of the first double-sided metalized film is a + sigma + beta, and the widths of the strip-shaped metal electrodes except the strip-shaped metal electrode at the leftmost edge of the upper surface of the first double-sided metalized film are a; wherein beta is the edge broadening value of the double-sided metalized film;
the right side edge of the second double-sided metalized film is staggered with respect to the right side edge of the first double-sided metalized film, the first insulating dielectric film and the second insulating dielectric film by a film edge extending rightwards;
the strip-shaped metal electrode is arranged at the right side edge of the lower surface of the second double-sided metalized film along the width direction, the width of the strip-shaped metal electrode at the rightmost side edge of the lower surface of the second double-sided metalized film is a + sigma + beta, and the width of the strip-shaped metal electrode except the strip-shaped metal electrode at the rightmost side edge of the lower surface of the second double-sided metalized film is a.
4. The high-voltage alternating current capacitor according to claim 3, wherein the upper surface strip-shaped metal electrode of the first double-sided metalized film is a first layer electrode, the lower surface strip-shaped metal electrode of the first double-sided metalized film is a second layer electrode, the upper surface strip-shaped metal electrode of the second double-sided metalized film is a third layer electrode, and the lower surface strip-shaped metal electrode of the second double-sided metalized film is a fourth layer electrode;
a superposed region separated by a base film of a first double-sided metalized film and a first insulating dielectric film exists between the first layer of electrode and the third layer of electrode, and the superposed region of each pair of electrodes in the first layer of electrode and the third layer of electrode forms a first capacitor unit;
a superposition area separated by a first insulating dielectric film exists between the second layer electrode and the third layer electrode, and the superposition area of each pair of electrodes in the second layer electrode and the third layer electrode forms a second capacitance unit;
a superposed region separated by the first insulating dielectric film and the base film of the second double-sided metalized film exists between the second layer of electrode and the fourth layer of electrode, and the superposed region of each pair of electrodes in the second layer of electrode and the fourth layer of electrode forms a third capacitor unit;
a superposition area separated by a base film of the first double-sided metalized film, a first insulating dielectric film and a base film of the second double-sided metalized film exists between the first layer of electrode and the fourth layer of electrode, and the superposition area of each pair of electrodes in the first layer of electrode and the fourth layer of electrode forms a fourth capacitor unit;
the effective areas of the first capacitor unit, the second capacitor unit, the third capacitor unit and the fourth capacitor unit are the same.
5. A high voltage AC capacitor according to claim 4, wherein the capacitance of the capacitor unit is calculated by: c i ＝2Kε 0 ε f S/d i (ii) a Wherein i =1,2,3,C 1 Is the capacitance of the second capacitive unit, C 2 Is the capacitance of the first or third capacitor unit, C 3 Is the capacitance of the fourth capacitive unit; k is the winding coefficient of the winding of the capacitor core; epsilon 0 Is a vacuum dielectric constant; epsilon f Wound for capacitor coresThe composite dielectric constant of the interelectrode medium under the condition of the winding coefficient K; d i Is the total thickness of the dielectric between the electrodes in the capacitor unit; s is the effective area of the capacitor unit, S = b × L, b is the width of the capacitor unit, and L is the length of the capacitor unit;
the calculation formula of the distributed voltage on the capacitor unit is as follows: u shape i ＝CU/C i (ii) a In the formula of U i The voltage is distributed on the capacitor unit, C is the capacitance value of the whole capacitor, and U is the alternating voltage applied to two ends of the capacitor;
the calculation of the electric field strength on the capacitor cell medium is: e i ＝U i /(d i /K)＝K(CU/C i )/d i ＝CU/2ε 0 ε f S; in the formula, E i Is the electric field strength on the capacitive cell medium.
6. A high voltage AC capacitor according to claim 5, wherein the capacitance value C' of the series combination of the first, second, third and fourth capacitance units is calculated as: c' = C 1 C 2 C 3 /(C 2 C 3 +2C 1 C 3 +C 1 C 2 )；
Voltage U distributed over capacitance C C’ The calculation formula of (c) is: u shape C’ ＝CU/C’；
By voltage U C’ Resulting in a surface axial field strength E C’ The calculation formula of (A) is as follows: e C’ ＝U C’ C; wherein c is the distance between two adjacent strip electrodes on the same layer of the double-sided metalized film.
7. A high-voltage AC capacitor according to claim 6, wherein a is in the range of 3mm to 6mm; the value range of c is 7 mm-10 mm; sigma is more than or equal to 1mm; beta is more than or equal to 1mm.
8. A high voltage ac capacitor according to claim 2, wherein the first insulating dielectric film and the second insulating dielectric film are both metal-plating-free films and have the same size;
the width of the first insulating dielectric film and the width of the second insulating dielectric film are staggered sigma compared with the narrow film edge of the first double-sided metalized film, and the first insulating dielectric film and the second insulating dielectric film are made of the same material as the base film.
9. A high voltage ac capacitor according to claim 1 wherein said core comprises a cylindrical mandrel;
the first double-sided metalized film, the first insulating dielectric film, the second double-sided metalized film and the second insulating dielectric film are sequentially laminated, combined and wound on a cylindrical mandrel from top to bottom to form a cylindrical core, and gold is sprayed on two end parts of the core, so that two electrodes of the core are led out.
10. The high voltage ac capacitor of claim 9, further comprising: a housing;
the centers of two axial end parts of the shell are respectively provided with a wiring terminal; leading-out wires are welded after the two end parts of the core are sprayed with gold, and the two leading-out wires are respectively connected to the two wiring terminals at the end part of the shell;
the gap between the shell and the core and the gap in the core are filled with insulating resin by vacuum pouring.
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| CN202320116701.6U CN218826664U (en) | 2023-02-06 | 2023-02-06 | High-voltage alternating current capacitor |
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| CN202320116701.6U CN218826664U (en) | 2023-02-06 | 2023-02-06 | High-voltage alternating current capacitor |
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