JPH10304540A - Gas-insulated bus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a capacitor for a flange which is used for suppressing surges and has a large capacitance, by providing a capacitor composed of an insulating film connecting flanges to each other. SOLUTION: A capacitor is composed of a capacitor main body 12, using an insulating film and a cover 13 provided on the outer peripheral side of the main body 12. The main body 12 is composed mainly of main electrodes 14 and 15, auxiliary electrodes 16 and 17 for forming capacitor, and insulating films 18 provided between the auxiliary electrodes 16 and 17. The main electrodes 14 and 15 are provided, so that the electrodes 14 and 1 face flanges and connected to the auxiliary electrodes 16 and 17. The electrodes 16 and 17, which are alternately laminated upon one another and the insulating films, are provided between the electrodes 16 and 17. Therefore, a flexible capacitor which uses the insulating films as a dielectric substance and has a large capacitance can be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated bus constituting a gas insulated switchgear used in a substation, and more particularly to a gas insulated bus suitable for suppressing a surge generated in a flange.

[0002]

2. Description of the Related Art In order to suppress a surge generated between flanges of a sheath insulating portion of a gas-insulated bus constituting a gas-insulated switchgear, measures are taken to provide a gap between the flanges, provide a zinc oxide element, or provide a capacitor. Has been taken. Conventionally, when a capacitor is provided, as shown in FIG.
A method is adopted in which a cylindrical metal ring 43 is arranged on the outer peripheral side of the substrate and an insulating cylinder 44 made of epoxy resin is provided between the flange 40 on one side and the cylindrical metal ring 43 to form a capacitor.

[0003]

In the above prior art,
Because epoxy resin is used as the dielectric, the thickness is
mm or less in capacitance (tens of thousands of pF
Since it is difficult to manufacture the insulating cylinder 44, there is a problem that the surge suppression effect is reduced. Further, when applied to a large gas insulated busbar, since the adhesion between the insulating tube 44 and the flange 40 or the insulating tube 44 and the cylindrical metal ring 43 is not good, a gap is formed and the insulating performance is adversely affected. In addition, there is a problem that the capacitance is reduced and the mounting is not easy.

An object of the present invention is to provide a flange capacitor having a large capacitance for suppressing a surge.

[0005]

In order to achieve the above object, a gas insulating bus of the present invention comprises a sheath, a high-voltage conductor disposed inside the sheath, an insulating spacer for insulatingly supporting the high-voltage conductor, A flange provided on the sheath for hermetically supporting the insulating support spacer, and a capacitor comprising an insulating film connecting between the flanges is provided.

[0006] Also, a sheath, a high voltage conductor disposed inside the sheath, an insulating spacer for insulatingly supporting the high voltage conductor, a flange provided on the sheath for hermetically supporting the insulating supporting spacer, and an insulating film. And an auxiliary electrode connected to the two main electrodes is alternately arranged between a plurality of laminated insulating films while two main electrodes of the capacitor are arranged so as to face the flange. It is characterized by being arranged.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be specifically described below with reference to FIGS. FIG. 1 is a longitudinal sectional view of a gas-insulated bus of this embodiment, FIG. 2 is a longitudinal sectional view showing an arrangement example of a capacitor, FIG. 3 is a longitudinal sectional view showing details of a capacitor body, and FIG. FIG.

As shown in FIG. 1, in the gas-insulated bus of the present embodiment, an insulating gas is sealed in a grounded sheath 2 and a high-voltage conductor 1 is disposed in the center of the sheath 2. ing. The high-voltage conductor 1 is insulated and supported by an insulating spacer 3 supported between flanges 5 and 6 provided on a sheath 2. As shown in FIG. 2, bolt holes are provided in the flanges 5, 6 and the insulating spacer 3, and the bolts 4, flange 5,
The flanges 5, 6 are tightened by a nut 11 insulated by an insulating washer 10 provided on the outside of the flange 6, thereby ensuring airtightness and insulation between the flanges 5, 6. As shown in FIG. 4, a capacitor 7 is disposed around the outer periphery of the insulating spacer 3 and the flanges 5 and 6.

When a disconnector or a grounding switchgear of the gas insulated switchgear is opened and closed, a high-frequency surge of several MHz or more is generated between the flanges 5 and 6. Flashover may occur in the insulating part. In order to prevent this, a capacitor 7 using an insulating film as a dielectric is provided with spacers 3, flanges 5,
6 are arranged. As shown in FIG. 2, the capacitor 7 of the present embodiment includes a capacitor body 12 using an insulating film and a cover 13 provided on the outer peripheral side thereof.

[0010] As shown in FIG.
Is mainly composed of main electrodes 14 and 15, auxiliary electrodes 16 and 17 for forming a capacitor, and an insulating film 18 provided between the auxiliary electrodes 16 and 17. Main electrode 1
The main electrodes 14 and 15 are connected to auxiliary electrodes 16 and 17, respectively. The auxiliary electrodes 16 and 17 are alternately stacked. . An insulating film 18 is provided between the auxiliary electrodes 16 and 17. As a material of the insulating film 18, mica film, PET, PEN or the like can be used. By bonding or vapor-depositing a thin conductive film such as aluminum on both surfaces or one surface of the insulating film 18, it is possible to eliminate the effect of voids between the layers.

The capacitance of the capacitor 7 depends on the dielectric constant and thickness of the material of the insulating film 18 and the auxiliary electrodes 16 and 1.
7 can be easily set, and the thickness of the capacitor body can be set to several mm or less even in consideration of a capacitance of about tens of thousands of pF and a withstand voltage of about tens of thousands of volts. In addition, since there is flexibility with respect to the facing surfaces of the flanges 5 and 6, the mounting of the capacitor body is easy.

Here, the outer peripheral facing surfaces of the flanges 5 and 6 are:
In order to prevent the capacitance from being reduced by the insulating paint, the insulating paint is not applied, or the conductive paint is applied entirely or partially. In order to protect the capacitor body 12 from an atmosphere such as wind and rain, flying objects, and the like, a cover 13 generally formed of an insulating material is provided.
By integrating the capacitor body 12 and the cover 13,
It can also be attached to flanges 5 and 6.

As described above, according to the present embodiment, a flexible and tens of thousands of p
It is possible to form a capacitor having a capacitance of about F or more and to provide a flange capacitor for suppressing surge.

Another embodiment of the present invention will be described with reference to FIG. FIG. 5 is a cross-sectional view of the flange portion.

As shown in FIG. 5, in this embodiment, the capacitors 23 and 24 provided around the flange are divided into two parts for easier mounting. In addition, it is also possible to divide the capacitor into two or more parts. In this case, since an integrated body of a plurality of capacitor bodies and a cover can be attached to the flange portion, the attachment is further facilitated. .

Another embodiment of the present invention will be described with reference to FIG. FIG. 6 is a longitudinal sectional view showing an example of the arrangement of capacitors.

As shown in FIG. 6, in this embodiment, an elastic rubber cover 2 is used as a protective cover.
5 is put on the capacitor body 12. Therefore, FIG.
4 is more elastic than that of the embodiment shown in FIG. 4, so that the mounting can be made easier. Also, a capacitor body divided into a plurality of parts in the peripheral direction and a protective cover can be integrated into the flange portion, which has an effect of facilitating the mounting. Instead of the elastic rubber-like cover, it is also possible to apply an insulating coating or an adhesive.

As described above, according to each embodiment of the present invention, a flange capacitor having a high flexibility and a large capacitance of about tens of thousands pF or more can be provided between the flanges. The generated surge can be suppressed.

[0019]

According to the present invention, it is possible to provide a flange-type capacitor having a large capacitance of about tens of thousands pF or more using an insulating film for suppressing a surge.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a gas-insulated bus according to one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing an example of the arrangement of capacitors.

FIG. 3 is a longitudinal sectional view showing details of a capacitor body.

FIG. 4 is a cross-sectional view of the flange portion of the embodiment.

FIG. 5 is a cross-sectional view of a flange portion according to another embodiment of the present invention.

FIG. 6 is a longitudinal sectional view showing an example of arrangement of capacitors according to another embodiment of the present invention.

FIG. 7 is a longitudinal sectional view of a flange portion of a conventional gas bus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... High voltage conductor, 2 ... Sheath, 3 ... Spacer, 4 ... Bolt, 5, 6 ... Flange, 7 ... Capacitor, 10 ... Insulating washer, 12 ... Capacitor main body, 13 ... Cover, 14,
Reference numeral 15: main electrode, 16, 17: auxiliary electrode, 18: insulating film, 23, 24: split capacitor, 25: rubber-like cover.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hirohiko Yatsuka 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Inside the Kokubu Plant, Hitachi, Ltd. (72) Inventor Masatomo Kobayashi 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture No. 1 Inside the Kokubu Plant, Hitachi, Ltd. (72) Inventor Tokio Yamagoku 1-1-1, Kokubuncho, Hitachi, Hitachi, Ibaraki Prefecture Inside the Kokubu Plant, Hitachi, Ltd. (72) Inventor Kazuo Taguchi, Kachibu-cho, Hitachi 1-1, Kokubu Plant, Hitachi, Ltd. (72) Inventor Takayuki Nemoto 1-1-1, Kokubuncho, Hitachi City, Hitachi, Ibaraki Prefecture Kokubu Plant, Hitachi, Ltd. (72) Inventor Masaru Fukuoka, Higashi, Higashi, Ibaraki Prefecture 1-15-25 Kanazawacho Within Hitachi Electric Systems, Ltd. (72) Inventor Bin Hashimoto 1-1-1 Kokubuncho, Hitachi, Hitachi No. stock company Hitachi Kokubu in the factory (72) inventor Masahiro Shimokawa Hitachi City, Ibaraki Prefecture Kokubuncho within 1 Chome stock company Hitachi Kokubu Plant

Claims (8)

[Claims] 1. A sheath, a high-voltage conductor disposed inside the sheath, an insulating spacer for insulatingly supporting the high-voltage conductor, a flange provided on the sheath for sealingly supporting the insulating support spacer, and A gas-insulated bus, comprising: a capacitor formed of an insulating film for connecting to a power supply. 2. An insulating film comprising: a sheath; a high voltage conductor disposed inside the sheath; an insulating spacer for insulating and supporting the high voltage conductor; a flange provided on the sheath for sealingly supporting the insulating supporting spacer; And an auxiliary electrode connected to the two main electrodes is alternately arranged between a plurality of laminated insulating films while two main electrodes of the capacitor are arranged so as to face the flange. A gas-insulated bus bar, which is arranged. 3. The insulating film is a mica film, PE
3. The gas-insulated bus according to claim 1, wherein the bus is formed of T or PEN. 4. The gas-insulated bus according to claim 1, wherein a thin conductor is adhered or vapor-deposited on both surfaces or one surface of the insulating film. 5. The gas insulation according to claim 1, wherein the outer peripheral surface of the flange does not form an insulating coating, or is formed at least partially by applying a conductive coating. Busbar. 6. A capacitor provided with a circumferential cover outside the capacitor, wherein the capacitor and the cover are integrally formed, or the cover is formed of an elastic rubber material. The gas-insulated busbar according to any one of claims 1 to 5, wherein 7. The gas insulated bus according to claim 1, wherein said main electrode is provided in a circumferential shape. 8. The capacitance of the capacitor is tens of thousands of p.
The gas-insulated bus according to claim 1, wherein F is F. 9.