JP2001060529A - Dry metallized film capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safe, small-sized, and light-weight dry metallized film capacitor using metallized films but no insulating oil. SOLUTION: A dry metallized film capacitor is constituted, in such a way that each capacitor element 1 is formed by winding a pair of metallic films in an overlapping state and forming metallikon sections 1a at both end sections of the element 1, and each elemental body 5 is formed by connecting the capacitor elements 1 in series, and after respectively passing insulating bars 2 through the through-holes 1b of the elements 1, coating the capacitor elements 1 with an insulating resin 4. Then an aggregate 7 is formed by connecting the elemental bodies 5 in series, parallel, or series and parallel and being housed in a container 10, while the aggregate 7 is connected by a single-phase connection, a delta connection, or a star connection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry metallized film capacitor comprising a plurality of element bodies mainly used for power factor improvement related to electric power.

[0002]

2. Description of the Related Art Hitherto, as this kind of high-voltage phase-advancing capacitor, the one described in Japanese Utility Model Laid-Open Publication No. 63-61116 is known. In the above publication, a plurality of round-wound capacitor elements are connected in series and housed in an insulating tube, a plurality of the insulating tubes are juxtaposed, and upper and lower ends thereof are fixed by insulating plates to constitute a capacitor unit.

[0003]

However, in the configuration disclosed in the above publication, the series-connected round-wound capacitor elements are housed in an insulating tube, and the number required for forming the capacitor is put together and the plurality of insulating capacitors are insulated. Just by fixing the upper and lower ends of the cylinder with insulating plates, it is not possible to absorb the stress at the time of storage of the circular wound capacitor and the mechanical shock force due to vibration, which causes cracks in the metallikon part, Deterioration of the insulation characteristics and increase of the loss rate, or in the worst case, the capacitor element elutes when the capacitor is destroyed,
There has been a problem that the quality characteristics are deteriorated, for example, the insulating tube is damaged by the eluted material and short-circuited to the container.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. An insulating rod is inserted into a through hole of a capacitor element connected in series, and the elements are aligned.
The body is covered with an insulating resin, and the body is stored in a container.
An object of the present invention is to provide a dry-type metallized film capacitor fixed with a fixing resin and having good quality characteristics, and to improve the dimensional accuracy by aligning the capacitor elements in a straight line.

That is, a pair of metallized films are superposed and wound, a capacitor element 1 having a metallikon section 1a formed at both ends thereof is connected in series, and an insulating rod 2 is inserted into a through hole 1b of the element. The element bodies 5 covered with the insulating resin 4 are connected in series, parallel, or series-parallel to form an aggregate 7 , and the aggregate is single-phase, delta-connected, or star-connected, and It is characterized by being stored.

Further, screw portions 2a are provided at both ends of the insulating rod 2.
Is formed.

Further, the present invention is characterized in that the element body 5 is fixed to a container 10 with a fixing resin 9.

Further, the present invention is characterized in that the container 10 is filled with an insulating gas 12.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An insulating rod is inserted into a through hole of a capacitor element connected in series, and the element is aligned and packaged with an insulating resin. In addition, it is possible to absorb a mechanical shock force due to vibration, and to prevent cracks in the metallikon portion and disconnection in the metallikon portion. Also, since the insulating rods are inserted into the through holes of the plurality of capacitor elements connected in series and aligned, the dimensional accuracy can be improved without meandering of the capacitor elements, and furthermore, the outer resin of the capacitor elements can be improved. The thickness becomes uniform, a decrease in withstand voltage can be prevented, and the quality can be stabilized. Then, an element formed by covering the capacitor element with an insulating resin is connected in series, parallel or series-parallel to form an aggregate, and the aggregate is used by being connected in a single phase, delta connection, or star connection. Voltage according to the purpose,
Capacitors having a capacity can be easily provided.

[0010]

FIG. 1 is a view showing an embodiment of a dry metallized film capacitor according to the present invention, wherein a front part of a container is removed, and FIG. 2 is an assembly constituting FIG. FIG. 3 is a longitudinal sectional view of the element body constituting FIG. 2,
FIG. 4 is a perspective view of the capacitor element constituting FIG.
Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments. The dry metallized film capacitor shown in FIG.
This is a three-phase, star-connected product. The element body 5 shown in FIG. 3 is connected in parallel as shown in FIG. 2, and at least an insulating film including a heat-resistant insulating film such as a polyimide film. Each of the element bodies 5 is surrounded by the film 3 to form an aggregate 7 , and the aggregate is formed into one phase to form three phases.
Are connected and fixed via the fixing insulating plate 6 by the screw portion 2a of the insulating rod 2 protruding from the terminal, and are connected to each other with the internal lead-out terminal 1c derived from the lower end of the assembly 7 of each phase as a neutral point. They are connected by a line 1d to form a capacitor unit. Next, the unit is housed in a container 10 via an insulating material 8 having an insulating property such as a mica plate, and epoxy resin,
Fixing resin 9 made of thermosetting resin such as urethane resin
, The unit is fixed, and the internal lead-out terminal 1c extending from the upper part of the assembly is connected to the external terminal 11 mounted on the container 10, and then N _{2 is} added to the container.
It is manufactured by filling an insulating gas 12 such as a gas.

In the element body 5 shown in FIG. 3, a plurality of capacitor elements 1 are connected in series with a connection line 1e, an insulating rod 2 is inserted into a through hole 1b of the element 1, and a thermosetting material such as epoxy resin or polyurethane resin is used. The package is formed by a transfer molding method, an injection method, a compression method, or the like using an insulating resin 4 made of a conductive resin.

In the capacitor element 1 shown in FIG. 4, for example, a polyethylene terephthalate film is wound as a first-wound film, and then a pair of metallized films such as a metallized polypropylene film are superimposed and wound many times to form a second-wound film. A polypropylene film is wound and formed. The center hole formed after the core, which is the center axis at the time of winding, is removed is defined as a through hole 1b, and a metal such as zinc or solder is sprayed on the winding end surface. Metallicon part 1a
Is formed.

The insulating rod 2 is an insulating material made of polyacetal, polyamide, epoxy resin containing glass, or the like.
The outer diameter of the capacitor element 1 is substantially the same as or slightly smaller than the inner diameter of the through hole 1b. The length of the insulating rod 2 may be appropriately determined according to the number of the capacitor elements 1 connected in series.

According to the above configuration, since the insulating rod is inserted into the through hole of the capacitor element connected in series and is covered with the insulating resin, it absorbs vibrations and mechanical shocks and cracks in the metallikon portion. Can be prevented and disconnection at the metallicon part can be prevented.Insulating rods are inserted through the through holes of a plurality of capacitor elements connected in series and aligned, so that the capacitor elements do not meander Being aligned on the top, the dimensional accuracy can be improved, and the capacitor element is covered with an insulating resin, so that the resin thickness becomes uniform, preventing a decrease in withstand voltage and stabilizing quality. be able to.

In the above embodiment, the threaded portion 2a of the insulating rod 2 protruding from each of the element bodies 5 is connected via the fixing insulating plate 6 so that the assembly 7 becomes one phase and becomes three phases. Fix and fix nuts 1 on the upper and lower surfaces of insulating plate 6 for fixing.
3,14 Although are arranged fixed to the lower side of the fixing insulating plate 6, i.e., the upper surface of the assembly 7, is omitted nut 14 abutting against the lower surface the upper surface of the assembly 7, insulating respectively fixed to a lower surface The same effect can be obtained even if the plate 6 is fixed with the nut 13 so as to abut.

Further, since the element body is covered with an insulating resin by inserting an insulating rod into the capacitor element connected in series,
The capacitor may be used as a single unit having excellent moisture resistance.
In this case, since the screw portion is formed at the tip of the insulating rod, it can be used as a mounting foot.

[0017]

According to the dry metallized film capacitor of the present invention, a plurality of capacitor elements can be easily assembled, an insulating rod is inserted into a through hole of the capacitor element connected in series, and the above element is covered with an insulating resin. Absorbs vibration and mechanical shock, prevents cracks in the metallikon section and breaks in the metallikon section, and insulates through holes in multiple capacitor elements connected in series. Since the rods are inserted and aligned, the capacitor elements are aligned in a straight line without meandering, and dimensional accuracy can be improved. Furthermore, since the thickness of the resin covering the capacitor element becomes uniform, a decrease in withstand voltage can be prevented, and the quality can be stabilized. In addition, since the element body is made by inserting an insulating rod into a capacitor element connected in series and enclosing it with an insulating resin, it has advantages such as being able to be used as a single capacitor, and its value is industrially and practically valuable. There is something very large. Then, an element formed by covering the capacitor element with an insulating resin is connected in series, parallel or series-parallel to form an aggregate, and the aggregate is used by being connected in a single phase, delta connection, or star connection. A capacitor having a voltage and a capacity suitable for the purpose can be easily provided.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of a dry metallized film capacitor of the present invention, and is a front view of a container with a front portion thereof removed.

FIG. 2 is a longitudinal sectional view of an assembly constituting FIG. 1;

FIG. 3 is a longitudinal sectional view of a body constituting FIG. 2;

FIG. 4 is a perspective view of a capacitor element constituting FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Capacitor element 1a Metallicon part 1b Through hole 1c Internal lead-out terminal 1d, 1e Connection line 2 Insulating rod 2a Screw part 3 Insulating film 4 Insulating resin 5 Element 6 Fixing insulating plate 7 Assembly 8 Insulator 9 Fixing Resin 10 Container 11 External terminal 12 Insulating gas 13, 14 Nut

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tomonori Higashie, Nichicon Co., Ltd. (72) Inventor Tohru Nakaji, 3rd floor of Uehara Bldg. F-term (reference) 5E082 AA11 AB04 BB03 BC33 BC39 CC14 CC15 EE07 FG06 FG35 HH08 HH28 HH32 HH48 HH50 JJ04 JJ22KK07

Claims (4)

[Claims] 1. A pair of metallized films are superposed and wound, a capacitor element having a metallikon section formed at both ends thereof is connected in series, an insulating rod is inserted into a through hole of the element, and then an insulating resin is used. The exterior body is connected in series, parallel, or series-parallel to form an aggregate, and the aggregate is single-phase,
A dry metallized film capacitor characterized by delta connection or star connection and housed in a container. 2. The dry metallized film capacitor according to claim 1, wherein screw portions are formed at both ends of the insulating rod. 3. The dry metallized film capacitor according to claim 1, wherein said element body is fixed to a container with a resin. 4. The dry metallized film capacitor according to claim 1, wherein said container is filled with an insulating gas.