JPS60223110A - High pressure oil-immersed metallized polypropylene film capacitor - 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 [Industrial Application Field] The present invention relates to an oil-immersed metallized polyb [pyrenefoam] membrane condenser for AC high pressure.

[Prior Art] As is well known, in order to reduce the size of the Tl film, a so-called metallized film (metalized film) in which the electrode is made of a metal vapor-deposited film is widely used.
If it is for low voltage (below 0V) and -C12KV or above, the deposited film may be destroyed by discharge, so Af
It is common to use metal foil such as fie.

In addition, when a capacitor that uses boria U pyrene film (hereinafter referred to as PP film) as a dielectric is used for high voltage applications, it must be impregnated with insulating oil. Metallized polyp["pyrene capacitors] are still used for high-pressure applications because they have defects such as getting stuck in oil and swelling, resulting in cracks in the ultra-thin vapor deposited film and loss of continuity, making it useless. has not been put into practical use.

Due to this fact, Pl) film is used as the dielectric material,
Various attempts have been made to put AC high voltage capacitors into practical use by applying a metal shield to the film surface. For example, JP-A-59-39017
As shown in the publication, it is specially refined as an impregnating oil.
Methods have been proposed, such as using plant extracts or increasing the crystallinity of the PP film. However, the former method is not preferable because it excludes impregnating oils that are currently used, and this results in practical limitations. Furthermore, the latter is not practical because the mechanical strength of the film is reduced, and the dielectric strength is also reduced, causing dielectric breakdown due to external stress.

[Purpose of the Invention] The present invention is a PP film capacitor using a metal vapor deposited film, which is essential for miniaturizing capacitors, and which also allows the use of ordinary insulating oil for AC high voltage applications. The purpose was to obtain an immersion metallized PP film capacitor. The purpose of the present invention is to use a PP film as a dielectric material, apply metal vapor deposition to the surface of the film, and prevent defects due to swelling in the film even when impregnated with commonly used insulating oil. The object of the present invention is to obtain a novel oil-immersed polypropylene film capacitor for high pressure applications.

[Structure of the Invention] The present invention uses a PP film as a dielectric, and the heat shrinkage rate of this PP film at 120°C is 3.
．． After setting the film to a range of 5 to 5.0, metal vapor deposition is performed on one surface of the film to use this as an electrode, and the surface roughness (Rmax) of at least the other surface is set to 1.
This is an attempt to improve the above-mentioned drawbacks of the conventional capacitor. To explain this point in detail below, when impregnating a capacitor element made by overlapping and winding a dielectric and an electrode with insulating oil, the insulating oil is usually impregnated with heat in the range of 60 to 100°C. There is a lot of consideration. The inventor of the present invention first focused on this point, and took advantage of the fact that the PP film swells and swells due to the impregnating oil in the case of -h, but shrinks when heated on the other hand. A predetermined heat shrinkage rate is given to the film, and when this film is heated with impregnating oil, the swelling action and the shrinkage action are balanced so that the defect described above does not actually occur due to swelling. It is characterized by the following. In other words, in the present invention, the biaxially stretched PP film has a heat shrinkage rate of 3.5 to 5.0% in both the longitudinal and transverse directions, and The temperature is 60-100
The degree of swelling at °C was suppressed to 0% or only slightly.

In the present invention, the heat shrinkage rate at 120°C is 3.5 to 5.0.
%/= because if the heating shrinkage rate is less than 3.5%, the degree of swelling in oil will increase and there is a risk of cracking in the extremely thin vapor deposited film. On the other hand, if it exceeds 5.0%, the shrinkage of the film becomes too large, making it difficult to impregnate the insulating oil.

In addition, in the present invention, the surface of the PP film is roughened T by, for example, the means described below, in order to improve the impregnability of the insulating oil. The reason why Table 11 was roughened at a relatively dense density by changing the numerical range from 1 to 3 μm is as follows.In other words, the larger the unevenness of the surface, the smaller the oil flow resistance. Although impregnation is easy, there is a limit because the effective thickness of the film also decreases.On the other hand, since the normal film thickness is approximately 20μ or less, it is sufficient to maintain this numerical range, but it is not perfect. Although it is optional whether or not to roughen the metal-deposited surface of the PP film, it is necessary to apply the roughening to the non-A4 side.

[Example] Figure 1n is an enlarged sectional view of a PP film used in the present invention.
Or surface tension LJIS K67 of 36 dyn/cm or more so that vacuum heating such as 70 is done uniformly.
68). Then, as shown by reference numeral 3, zinc was applied to the corona-treated surface 2 by the vacuum evaporation shield method at a rate of 1.5 to 6 Ω/cm.
An electrode is formed by vapor deposition to have a resistance value of aA. On the other side 4, as an example, write J: tte 1~
Roughen the surface so that the surface roughness is -b/ll!
i Lee. In other words, a very small amount of a crystallization nucleating agent such as α-quinacridone is added to PP, which is the raw rA resin, and a raw PP fabric is extruded on an I-table. At this time, if one side is slowly cooled at different humidity, for example, the top side of the raw fabric is at 28°C and the bottom side is at 90°C, and the other side is rapidly cooled and heated and stretched, a fibrillar shape is formed on the slowly cooled side. Unevenness occurs and the surface becomes rough. Note that this surface roughening can also be performed on both surfaces (for details, see Japanese Patent Application Laid-Open No. 53-42269). FIG. 2 shows an embodiment showing the basic winding configuration of a capacitor of the present invention, in which the metallized PP film 6 that is IU and I in FIG. be. FIG. 3 shows another embodiment in which a non-thermal film is interposed between the metallized films.
1. For example, it is used for high voltage applications such as microwave ovens. Figure 4 shows that metals such as zinc and solder are sprayed over 1/2 to 2/3 area of the end face of the wound element.
This is an example in which so-called metallized coating was applied to facilitate lead extraction. Figure 5 shows that the element prepared as described above is placed in a case with a terminal (=J) having sufficient dielectric strength, and then vacuum-drying and vacuum impregnation are carried out according to the usual method to fill the case with electrical insulating oil. The cross-section of the completed capacitor is shown in Figure 1. In the figure, numeral 5 is the undeposited part of the metal on the PP film, 7 is the metallicon, and 8 is the case. Electrical insulating oil is then injected into this.

In the present invention, as mentioned above, all commonly used metals such as zinc and aluminum can be used as the vapor-deposited metal, and as the insulating oil, ordinary mineral oil, castor oil, cottonseed oil, argylbenpine, diallyl alkane can be used. , polybutene oil, silicone oil, mineral oil, 41J physical oil, etc. can all be used.

Next, as an example, for a 15μ thick PP film,
A comparative test was conducted between the product according to the present invention and the conventional product, and the results shown in Table 1 were obtained. The numerical values in the table are )11)/TD, that is, the shrinkage rate in the longitudinal direction/horizontal direction, and a negative swelling degree indicates shrinkage of 1°. Polybutene oil was used as the impregnating oil. (Margin below)

[Brief explanation of the drawing]

Fig. 1 is an enlarged cross-sectional view showing an example of the PP film according to the present invention, Fig. 2 is a cross-sectional view of the same film coated with metal vapor deposition and placed face to face, and Fig. 3 is a cross-sectional view of the PP film according to the invention. 3
FIG. 4 is a schematic diagram showing an end face of a capacitor element, and FIG. 5 is a partially cutaway external view of the capacitor. 1...PP film, 2...Corona 51! ! Reason,
3... Electrode 4... Rough surface, 5... Undeposited part, 6...
...Undeposited film, 7...Metallicon, 8...Case. Honshu Paper Co., Ltd. No. 1 Figure 2 Figure 4 Written procedural amendments by Mr. Kazuo Wakasugi, Director General of the Patent and Patent Office May 24, 11i11, 1980 11 (F) tii Indication Patent Application No. 1988 7
8340@2 Name of the invention: High-pressure oil-immersed metallized polypropylene film capacitor 3 Relationship to the amended party case Patent applicant Honshu Paper Co., Ltd. 4 Agent Small Hall 5, 1-18-1-4 Nishi-Shinbashi, Minato-ku, Tokyo Specification to be amended Yamanaka "Detailed Description of the Invention" Column 6 Contents of the amendment (1) The statement on page 4, line 4 of the specification is corrected to "exceeding the range of ~5.0". (3) On page 6, line 8 of the same page, change ``Figure 1 is used in the present invention...'' to ``Figure 1 was subjected to metal vapor deposition...''
I am corrected. (4) In line 9 of the same page, change "...on one side to the surface" to "...
・Correct it to "one surface." (5) "With a non-vapor deposited film interposed," written on page 7, line 12, is corrected to "with a non-deposited film 6 interposed." Written amendment to the above procedure (Mr. Kazuo Wakasugi, Director General of the Self-Responsive Patent Office, May 2010, rr.
Day'+ Incident co display 1982 patent application No. 7834
No. 0 No. 2 Name of the invention: High-pressure oil-immersed metallized polypropylene film capacitor 3 Relationship to the case by the person making the amendment Patent applicant Honshu Paper Co., Ltd. 4 Agent Small Hall 5, 1-18-14 Nishi-Shinbashi, Minato-ku, Tokyo Amendment Column 6 of "Detailed Description of the Invention" in the Target Specification Contents of Amendment (1) "The vapor deposited film was destroyed" in the third line of page 2 of the specification is corrected to "the vapor deposited film was scattered."

Claims (1)

[Claims] A biaxially stretched boria (1) pyrene film with a heat shrinkage rate of 3.5 to 5.0% in both the longitudinal and transverse directions at 1120°C was used, and one side of the film was coated with metal vapor to form an electrode. At least the surface roughness of the other side (Rll1aX) is 1 to 3 μm.
High-pressure oil immersion metallized polypropylene film condensate υ characterized by having a range of .