JPS58200522A - Condenser - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention relates to the improvement of power capacitors, and involves forming a gas gap between the electrode and the film in a SF, gas-filled capacitor using a plastic film (hereinafter abbreviated as film) as a dielectric. The purpose is to eliminate fear.

Conventionally, as shown in FIG. 1(a), this type of capacitor has been manufactured by providing a metal vapor deposited film 3.4 of aluminum or the like on each side of a film 1.2 used as a dielectric material, respectively. 6, or as shown in FIG. 6(b), film 1.2 and metal ff17. A capacitor element of 9 tons was purchased by stacking the capacitor elements s on top of each other and winding each capacitor element, which was then sealed in an airtight container and filled with SF and gas.

However, in the case of such a structure, as shown in FIG. 2, in the case of metal vapor deposited films, in the metal vapor deposited films 5 and 6 adjacent to each other, the film 1 of the metal vapor deposited film 5 of -10,000 and the metal vapor deposited film 6 of the other metal vapor deposited film 6 are separated. A gas gap 10 is formed between the film and the metal foil 4, and when a film and a metal foil are used in an overlapping manner, a gas gap is naturally formed between the two. The discharge voltage in these gas gaps is much lower than the withstand voltage of film 1.2, so even if a film with sufficiently high dielectric strength is used as a dielectric, it will not be as high as υ.
Because partial discharge occurs at much lower voltages and the film deteriorates, it is not possible to obtain a suitable potential gradient, which is a factor that hinders the miniaturization of capacitors.

The present invention eliminates this drawback, increases the partial discharge voltage by preventing the formation of a gas gap between the electrode portion and the film, reduces the size of the capacitor, and improves the quality. Hereinafter, the cine invention will be explained in detail with reference to Examples. -' In FIG. 3, 11 and 12 are metal foils such as aluminum used as electrodes, and 13 and 14 are films used as dielectrics. However, the films 13 and 14 have fiber materials 13A and 13B on both sides, respectively.
14A and 14B are bonded together to form a composite dielectric, and the figure shows a state in which the inside is impregnated with resin 15, as will be described later.

, thus fibrous materials 13A, 43B and 14A.

Films 13゜14 attached to both sides of 14B'
The capacitor element '916 is formed by overlapping the metal foils 11 and 12, and winding or folding them as shown in FIG. Next, I composed it with this:' mouth. The capacitor element 16 is dried in the same manner as in the prior art, evacuated, and impregnated with the resin 15 as shown in FIG.

In this case, since the films 13 and 14 are in contact with the metal foils 11 and 12 with the fiber materials 13A and 13B +' 14 A and 14B attached to both sides, respectively, the resin 15 is filled inside the fiber materials without any gaps. , there is no gap between the metal foil and the film as in the conventional method. After the capacitor element 16 is impregnated with the resin 15, it is stored in a sealed container to avoid moisture and sunlight, and is filled with SF6 gas or the like to improve insulation and stabilize quality.

In this way, in the present invention, the occurrence of a gap between the film and the metal foil, which was unavoidable in the past, can be prevented by providing a fiber material bonded to the film and impregnating the resin through the fiber material without any gaps. For example, a polyethylene terephthalate film may be used as the film, a polyester nonwoven fabric may be used as the fiber material, and the two may be bonded together.

Note that the fiber material does not necessarily need to be bonded to the film.
It can also be used simply by stacking it on a film. Further, as the resin, epoxy varnish, phenolic face, silicone face, polyester nonwoven fabric, etc. can be used.

As explained above, according to the present invention, a composite dielectric made of film and fiber material is used as the dielectric, metal foil is layered and wound around it, or folded and tied to form a capacitor element, and then dried. After vacuuming, impregnate with resin. By doing so, the resin is filled between the film and the metal foil without any gap, and it is possible to eliminate the fear that a gap will occur between the two as in the conventional case. Note that by further sealing the capacitor element manufactured in this way in a container and filling it with an insulating gas such as SF6, a capacitor that is smaller and of improved quality can be obtained.

[Brief explanation of the drawing]

1(a) and (b) are perspective views showing the structure of a conventional capacitor element, FIG. 2 is an enlarged sectional view thereof, FIG. 3 is an enlarged sectional view showing the structure of an embodiment of the present invention, and FIG. 4 FIG. 2 is a perspective view showing the configuration of the same embodiment. 11.12...Metal 7i, 13,14...Film, 13A, 13B, 14A, 14B River fiber material, 15...
·resin.

Claims (1)

[Claims] A composite dielectric is constructed by providing a fiber material on both sides of a plastic film used as a dielectric, and the composite dielectric is sandwiched between metal foils and wound or folded to form a capacitor element, and the resin is applied to the capacitor element under vacuum. A capacitor characterized by being impregnated, sealed inside a container, and filled with an insulating gas.