JP2562160Y2 - Dry metallized film capacitors - Google Patents

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 filled with an insulating gas.

[0002]

2. Description of the Related Art Conventionally, a capacitor filled with an insulating gas is generally a capacitor element formed by winding a metallized film having a width of about 100 mm. After being connected as a drawer, it was housed in a metal outer box and filled with an insulating gas to form a dry metallized film capacitor.

[0003]

In the conventional dry-type metallized film capacitor filled with the above-mentioned insulating gas, since the capacitor element has a round shape, the accommodation rate is extremely poor when a plurality of the capacitor elements are arranged, and the size is reduced. There were drawbacks that could not be done. Therefore, if the capacitor element is flattened, the accommodation rate will be improved and the size can be reduced, but after the metal spraying, multiple elements are tightened again, and it is not possible to strongly tighten the element due to the necessity of configuring the unit, When an AC voltage is applied, there is a problem in that the noise level increases due to the vibration of the metallized film, which may adversely affect the electrical characteristics.

[0004]

When arranging a plurality of metallized film capacitor elements, a plastic sheet having a width smaller than the element width is interposed between the capacitor elements, and tightening is performed to constitute a capacitor unit. It has been found that when a dry-type metallized film capacitor is used, the noise level is low, the electric characteristics are good, and the electric characteristics are stabilized by miniaturization. That is, when a metallized film is wound to form a capacitor element in a flat shape, a metal is sprayed on an end face of the element to form an electrode lead portion, and a plurality of the elements are stacked to form a capacitor unit. A plastic sheet shorter than the element width is interposed between the elements, tightened, and then connected,
This is a dry metallized film capacitor that is housed in a metal outer box and filled with insulating gas.

[0005]

[Function] When the metallized film capacitor element is flattened, loosening occurs, and when an AC voltage is applied, the noise level tends to increase. However, if the thickness of the plastic sheet interposed between the elements is 0.5 mm or more, The noise level can be suppressed by arranging the capacitor element within 0.5 to 15 mm from the end of the capacitor element.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a capacitor element wound with a metallized film having a thickness of 9 μm and a width of 300 mm is formed into a flat shape by pressing, and metal is sprayed on an end face of the element to form an electrode lead-out portion 2. Are formed between the capacitor elements 1 with a polypropylene sheet 3 having a width narrower than the element width, and a plurality of stacked sheets are fastened together with the protection plate 4 and fixed with the band 5 to form a capacitor unit. Rated in a metal outer box 6 and three-phase 60 Hz 6.6 kV
A power capacitor filled with 300 kvar of sulfur hexafluoride gas was manufactured as a test sample. The experiment was conducted by changing the length L from one end of the element as the dimension of the polypropylene sheet.

The noise level of this sample was measured and evaluated. The measuring method is performed under the following conditions by referring to JIS Z 8731 “Method of measuring noise level”. (a) Energizing conditions Three-phase 60 Hz 6.6 kV (b) Measuring instrument Indicator sound level meter specified in JIS C 1502 (c) The measuring method is 30 cm from the measurement sample and from the floor as shown in Fig. 2 (a) and (b). The sound level meter 7 is installed at a distance of 20 cm, and the audibility correction circuit of the sound level meter performs measurement using the A characteristic. The measurement results are shown in FIGS. As the results show, the thickness of the polypropylene sheet is 0.5 mm or more,
Further, if one side dimension L is 0.5 to 15 mm from the element end, noise can be reduced. Note that, in addition to polypropylene, polyethylene terephthalate, vinyl chloride, and epoxy resin were also used as the material of the plastic sheet.

[0008]

As described above, by interposing a plastic sheet having a thickness of 0.5 mm or more and 0.5 to 15 mm shorter than one end of the element between the flat capacitor elements according to the present invention, the noise level can be reduced to 50 on average. It is possible to reduce the size of the capacitor because it can be suppressed to below the phone (A) characteristic, the noise level is low, and the electrical characteristics are stable.

[Brief description of the drawings]

FIG. 1 is a front view of a metallized film capacitor unit according to the present invention.

FIGS. 2A and 2B are explanatory views of a method for measuring a noise level of a metallized film capacitor, wherein FIG. 2A is a plan view and FIG. 2B is a front view.

FIG. 3 is a characteristic diagram showing a change in noise level when a polypropylene sheet 5 mm shorter than one side end of an element is interposed between capacitor elements of a metallized film capacitor.

FIG. 4 is a characteristic diagram showing a change in noise level when a 0.5 mm-thick polypropylene sheet is interposed between capacitor elements of a metallized film capacitor.

FIG. 5 is a characteristic diagram showing a change in noise level when a 0.5 mm-thick polypropylene sheet is interposed between capacitor elements of a metallized film capacitor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Capacitor element 2 Electrode lead-out part 3 Polypropylene sheet 4 Protective plate 5 Band

Continuing from the front page Examiner Fumio Takei (56) References JP-A-59-36922 (JP, A) JP-A-61-220316 (JP, A) Fully open Showa 54-89446 (JP, U) Really open Showa 56 −154030 (JP, U) Actually open 48-28035 (JP, U)

Claims (2)

(57) [Scope of request for utility model registration] 1. A capacitor element is formed in a flat shape by winding a metallized film, metal is sprayed on an end face of the element to form an electrode lead portion, connected, and stored in a metal outer box. A dry metallized film capacitor filled with an insulating gas, wherein a plastic sheet having a width smaller than the element width is interposed between the flat elements. 2. The plastic sheet having a thickness of 0.5
2. The dry-type metallized film capacitor according to claim 1, wherein the thickness is 0.5 mm or more and 0.5 to 15 mm inside the end of the capacitor element.