CN203192599U

CN203192599U - Film capacitor used in large power three-phase alternating current filtering occasion

Info

Publication number: CN203192599U
Application number: CN 201320104215
Authority: CN
Inventors: 俞广铨; 陈栋; 郑云
Original assignee: WUXI CHENRUI NEW ENERGY TECHNOLOGY Co Ltd
Current assignee: WUXI CHENRUI NEW ENERGY TECHNOLOGY Co Ltd
Priority date: 2013-03-07
Filing date: 2013-03-07
Publication date: 2013-09-11
Anticipated expiration: 2023-03-07

Abstract

The utility model relates to the technical field of an electric power electronic capacitor and specifically relates to a film capacitor used in a large power three-phase alternating current filtering occasion. The film capacitor has a reasonable structure, needs no repeated wiring of multiple capacitors, has small volume and is safer and more reliable to use. The film capacitor comprises capacitor cores, connection copper belts, leading-out ends, a housing, embedding material and a plastic positioning cover, wherein the capacitor cores and the leading-out ends are respectively three in number, every two of the three capacitor cores are connected through the connection copper belts to form a triangular structure, and connection ends of the three capacitor cores are respectively connected with the three leading-out ends through the connection copper belts.

Description

The film capacitor that is used for high-power three-phase alternating current filtering occasion

Technical field

The utility model relates to the power electronic capacitor technical field, is specially a kind of film capacitor for high-power three-phase alternating current filtering occasion.

Background technology

In the application scenario of power electronic equipment, for administering harmonic wave and improving power factor, all can use ac filter electric capacity at the interchange end, especially in some powerful converter/inverter occasions, the operating frequency of equipment itself is very high, harmonic current to the electrical network feedback is very big, if there is not ac filter electric capacity that impedance path is provided, will have a strong impact on the operate as normal of electrical network and relevant device.Because the occasion of using is important, and big by electric current during capacitor work, heating is serious, and heating is serious and reduce life-span even inefficacy easily to make this electric capacity, so very high to the requirement of this electric capacity.

The capacitor commonly used in this occasion generally has two kinds: a kind of for single-phase, by the external three-phase line of client, and many radiating surfaces that increase in parallel, solve the super-high-current problem, and but so loosely organized, the shared volumetric spaces of electric capacity is big, the cost height; Another kind is as three-phase integrated, inner three electric capacity delta connections, oil formula structure strengthens heat radiation, but overcurrent capability is low, maximum can only reach 40 ~ 50A, and anti-harmonic wave ability is little, often is not suitable for the application scenario of the big electric current of this higher harmonics, and have the danger of leakage of oil, to reaching environmental protection and safe and reliable totally unfavorable.

Summary of the invention

In order to address the above problem, the utility model provides a kind of film capacitor for high-power three-phase alternating current filtering occasion, and it is rational in infrastructure, need not the wiring repeatedly of a plurality of electric capacity, and volume is little, uses more safe and reliable.

Its technical scheme is such: a kind of film capacitor for high-power three-phase alternating current filtering occasion, it comprises capacitor body, connection copper strips, exit, shell, potting compound, plastics location lid, it is characterized in that, described capacitor body, exit have three respectively, described three capacitor bodies link to each other in twos by described connection copper strips and form delta connection, and the link of described three capacitor bodies is by described three exits of the corresponding connection of described connection copper strips difference.

It is further characterized in that described capacitor body is formed around volume by metallized film, the coating edge wide cut thickening of described metallized film; Described connection copper strips is formed by the braiding of multiply annealed copper wire; Described potting compound is polyurethane; Described shell is the aluminium shell.

After adopting structure of the present utility model, three capacitor bodies are by connecting the copper strips continuous delta connection that forms in twos, three capacitor bodies are by connecting copper strips three exits of corresponding connection respectively, it is rational in infrastructure, need not a plurality of electric capacity repeatedly wiring can form three phase capacitance, reduced the capacitor volume, use thin-film capacitor to substitute traditional oily formula electric capacity, avoided the danger of leakage of oil, used more safe and reliable; Simultaneously, the coating edge wide cut of metallized film is thickeied, and can effectively reduce the ESR value of electric capacity itself, guarantees that electric current flows to when capacitor body is worked evenly, reduces the heating of capacitor body itself, improves filtering performance.

Description of drawings

Fig. 1 is thin-film capacitor integrated stand composition;

Fig. 2 is capacitor body johning knot composition;

Fig. 3 connects equivalent circuit diagram for capacitor body;

Fig. 4 is exit and plastics location cover attaching structure figure;

Fig. 5 is the metallized film structure chart.

Embodiment

See Fig. 1, Fig. 2, Fig. 3, Fig. 4, shown in Figure 5, a kind of film capacitor for high-power three-phase alternating current filtering occasion, it comprises capacitor body 1, shell 2, the plastics location covers 3, potting compound 5, connect copper strips 6, exit 4, capacitor body 1, exit 4 has three respectively, connect by being connected copper strips 63 between capacitor body 11 and the capacitor body 13, be connected by copper strips 66 between capacitor body 11 and the capacitor body 12, connect by being connected copper strips 62 between capacitor body 12 and the capacitor body 13, constitute delta connection, three

capacitor bodies

11,12,13 link is respectively by connecting

copper strips

65,61,64 draw, connecting

copper strips

65,61, be respectively arranged with exit 43 on 64,42,41, connecting copper strips 6 can be formed by the braiding of multiply annealed copper wire, zinc-plated with convenient welding, connecting copper strips 6 junctions is to flexibly connect, can in assembling process, not draw pine to pad, the thickness of the connection copper strips 6 that braiding forms can be determined on a case-by-case basis, under the situation of high-frequency current, because skin effect, the annealed copper wire of multiply is littler than general copper strips or copper coin heating,

capacitor body

11,12,13 are formed around volume by metallized film, the coating edge wide cut thickening of metallized film 7, conventional thin film coating edge thickened area 8 accounts for 10% ~ 15% of overall width, and accounts for thin film coating width about 40% in the utility model; Shell 2 is cylinders of aluminium moulding, because aluminium is non-magnetic metal, can prevent shell from the alternating electric field of high frequency, producing eddy current and generate heat, potting compound 5 adopts the flame retardant polyurethane of high heat conduction, has very high conductive coefficient, be 2 ~ 3 times of ordinary epoxy resin, guarantee the good heat radiating of product, simultaneously because be solid-state dry type, do not have the danger of oily formula electric capacity leakage of oil, also do not have the restriction of installation site and angle, exit 4 can be selected copper nut or brass bolt for use, cover in 3 the fairlead fixingly by being entrenched in plastics location, plastics are located 3 effects that take into account isolation capacitors fuse 1 and shell 2 simultaneously of covering; The utlity model has the little advantage of super-high-current ability and volume, easy for installation, can effectively reduce cost, reduced caloric value simultaneously, do not needed to adopt the oil-immersed type structure to strengthen heat radiation, leakage and flammable problem can not take place, dry construction is more safe and reliable, guarantees equipment life and stable.

Claims

1. film capacitor that is used for high-power three-phase alternating current filtering occasion, it comprises capacitor body, connection copper strips, exit, shell, potting compound, plastics location lid, it is characterized in that, described capacitor body, exit have three respectively, described three capacitor bodies link to each other in twos by described connection copper strips and form delta connection, and the link of described three capacitor bodies is by described three exits of the corresponding connection of described connection copper strips difference.

2. a kind of film capacitor for high-power three-phase alternating current filtering occasion according to claim 1 is characterized in that described capacitor body is formed around volume by metallized film, the coating edge wide cut thickening of described metallized film.

3. a kind of film capacitor for high-power three-phase alternating current filtering occasion according to claim 1 and 2 is characterized in that, described connection copper strips is formed by the braiding of multiply annealed copper wire.

4. a kind of film capacitor for high-power three-phase alternating current filtering occasion according to claim 3 is characterized in that described potting compound is polyurethane.

5. a kind of film capacitor for high-power three-phase alternating current filtering occasion according to claim 4 is characterized in that described shell is the aluminium shell.