JP2008054399A - Gas insulated switchgear and method for manufacturing the same - Google Patents

Abstract

A gas-insulated switchgear capable of preventing the gas-insulated switchgear from being scattered to the surroundings in the event of an abnormal rupture of a high-pressure gas container made of a casting, and a method for manufacturing the same
A gas insulated switchgear of the present invention includes a high-pressure gas container 1 made of a casting, and a plurality of high-strength and heat-resistant synthetic fibers are provided on the surface of the high-pressure gas container 1 so as to cover the whole. The aromatic polyamide fiber 2 is wound or pasted as follows. Further, a thermosetting resin is applied to the surface of the aromatic polyamide fiber 2, and a reinforced fiber plastic layer is formed on the surface of the high pressure gas container by the aromatic polyamide fiber 2 and the thermosetting resin.
[Selection] Figure 1

Description

  The present invention relates to a gas insulated switchgear and a method for manufacturing the same, and more particularly to an improvement in a casting high-pressure gas container of the gas insulated switchgear.

The gas-insulated switchgear is an electric device composed of a current-carrying conductor that allows electricity to flow in a high-pressure gas container that is pressurized and filled with an inert gas having high insulation performance, for example, SF ₆ .

  The inside of the high-pressure gas container has enormous electric energy, and if an explosion / explosion accident occurs, it will be significantly damaged. Therefore, in the unlikely event of an accident, careful attention is paid to the structural safety mechanism so that the outside of the equipment is not affected. In order to prevent accidents from occurring, the pressure vessel is operated based on strict manufacturing and use regulations stipulated by law from the manufacturing process to the use stage.

  At present, in a gas insulated switchgear used in Japan, a welded structure is widely used as a pressure vessel. In the past, products using a cast structure for high-pressure gas containers have been used, but in order to improve the resistance of the container, welding structures that are pressure vessels are widely used in gas insulated switchgear installed in power plants or substations. It is.

  In a high-pressure gas container manufactured with a welded structure that is a pressure vessel, the toughness (stickiness) force of each part itself works, the internal pressure is released around the crack, and brittle fracture is less likely to occur than in a cast structure. Moreover, even if it is a case where it ruptures, it cannot occur that many structural fragments scatter to the circumference (refer patent document 1).

On the other hand, in general, a cast structure is widely used as a high-pressure gas container of a gas insulated switchgear. This is because when a high-pressure gas container having the same shape is manufactured in large quantities, the high-pressure gas container having a cast structure is excellent in mass productivity, and therefore has an advantage that it can provide a product to the market very cheaply (Patent Document 2). reference).
JP 2003-264914 A Japanese Patent Laid-Open No. 2001-16718

  By the way, in a high-pressure gas container formed with a casting structure, even if it operates normally under normal operating pressure conditions, if a phenomenon similar to an unexpected explosion occurs in the container, the inside is energized due to the characteristics of the casting structure. The enormous electrical energy that is present can cause brittle fracture of local defects. In such a case, the crack may extend to the surroundings due to the material characteristics without the toughness (stickiness) of the cast structure, and a large number of structural fragments may be scattered around.

  Here, the potential defect portion is a defect in which a void such as a blow hole is generated in a cast structure, a defect (scratch) in which a part of the structure is peeled off and becomes uneven, or an inclusion is a structure. It includes various cases such as defects that are mixed in objects and cause changes in the required wall thickness.

  In order to prevent this defect, defective products are put on the market by performing various non-destructive inspections such as visual inspection, penetrant flaw detection test mainly for surface defect detection, radiation inspection and ultrasonic inspection mainly for internal defect detection. There is a mechanism that is not provided. However, it is difficult to find 100% defects including human error.

  If a product is mistakenly provided to the market with the above potential defects, it is practically difficult to eliminate such defects 100%. Among the gas insulated switchgears that can be used, those that employ a high-pressure gas container having a cast structure are extremely limited.

  Therefore, in order to satisfy all these safety requirements in a high-pressure gas container with a cast structure, a structure that does not rupture the high-pressure gas container is attempted, and at the same time, a mechanism is created to prevent a large number of structural fragments from scattering around. It was sought after.

  The present invention has been proposed in order to solve the above-described problems of the prior art, and the object thereof is to simplify the scattering of the gas insulated switchgear to the surroundings due to the abnormal burst of the casting high-pressure gas container. Another object of the present invention is to provide a gas insulated switchgear that can be prevented by a simple configuration and a method for manufacturing the same.

  In order to achieve the above object, a gas insulated switchgear according to the present invention includes a high-pressure gas container made of a casting, and a high-strength and heat-resistant synthetic fiber covering the entire high-pressure gas container on the surface of the high-pressure gas container, A reinforced fiber plastic layer is formed by a thermosetting resin applied to the surface layer of the synthetic fiber. The synthetic fiber is composed of any one of an aromatic polyamide fiber, a modified polyphenylene ether fiber, a spectrum fiber, or a polyketone fiber.

  Moreover, this invention can also be grasped | ascertained as the manufacturing method of the said gas insulated switchgear. That is, a method for manufacturing a gas insulated switchgear that forms a reinforced fiber plastic layer on the surface of a high-pressure gas container made of a casting, the surface of the high-pressure gas container having high strength and heat resistance so as to cover the entire high-pressure gas container And a step of applying a thermosetting resin to the synthetic fiber attached or wound around the high-pressure gas container.

  According to the present invention as described above, the fiber is also applied to a portion where it is difficult to mechanically wrap the belt-like fiber material, such as the curvature circle end of the high-pressure gas container or the intersection of the straight portion and the curvature portion. In addition, by applying a thermosetting resin to the surface, a reinforced fiber plastic layer can be easily formed on the surface of the high-pressure gas container. With such a simple configuration, it is possible to prevent scattering of the casting high-pressure gas container to the surroundings due to an abnormal burst.

  According to the present invention as described above, a gas-insulated switchgear that can prevent the gas-insulated switchgear from being scattered to the surroundings due to an abnormal burst of a high-pressure gas container made of casting, and a method for manufacturing the gas-insulated switchgear are provided. can do.

  Hereinafter, typical embodiments according to the present invention will be described in detail with reference to FIGS.

(1) First Embodiment [Configuration]
As shown in FIG. 1, the gas insulated switchgear according to the first embodiment of the present invention includes a high-pressure gas container 1 having a cast structure, and a plurality of sheets are provided on the surface of the high-pressure gas container 1 so as to cover the whole. As a synthetic fiber having high strength and heat resistance, an aromatic polyamide fiber 2 is wound or pasted. Further, a thermosetting resin is applied to the surface of the aromatic polyamide fiber 2, and a reinforced fiber plastic layer is formed on the surface of the high pressure gas container by the aromatic polyamide fiber 2 and the thermosetting resin.

  Here, as the aromatic polyamide fiber 2, for example, Kevlar fiber manufactured by DuPont of the United States is used, and as the thermosetting resin, for example, epoxy resin, polyester resin or vinyl ester resin is used. The polyester resin is inexpensive and has excellent market availability as compared with the epoxy resin. In addition, vinyl ester resins are cheaper in raw materials and superior in weather resistance than epoxy resins.

[Container forming method]
A method for forming the reinforcing fiber plastic layer of the high-pressure gas container 1 of the gas insulated switchgear according to this embodiment having the above-described configuration will be described. A plurality of aromatic polyamide fibers 2 having the same shape as the high-pressure gas container 1 are prepared in advance as synthetic fibers having high strength and heat resistance, and are pasted or wound around the container so as to cover the entire high-pressure gas container 1.

  Next, as shown in FIG. 2, a thermosetting resin is applied to the aromatic polyamide fiber 2 using the brush 3. Thus, a reinforced fiber plastic layer is formed on the surface of the high-pressure gas container 1 using a hand rare-up method, which is a technique for covering the entire surface of the high-pressure gas container 1, and a composite of the aromatic polyamide fiber 2 and the high-pressure gas container. Do.

[effect]
According to the present embodiment as described above, the fiber represented by Kevlar fiber among the aromatic polyamide fibers 2 is lightweight, high strength, high elasticity, heat resistance, chemical resistance, and excellent impact resistance performance. By providing the thickness strength, the strength can be secured up to about 40 kgf / cm ² or more.

  In particular, the fiber is attached to a portion where it is difficult to mechanically wrap the belt-like fiber material, such as the end of curvature of the high-pressure gas container 1 or the intersection of the straight portion and the curvature portion. By applying the resin, it is possible to easily form a reinforcing fiber plastic layer.

  Thereby, scattering to the circumference | surroundings by the bursting at the time of abnormality of the high-pressure gas container made of casting can be prevented with a simple configuration.

(2) Second Embodiment As shown in FIG. 3, the gas insulated switchgear according to the second embodiment of the present invention comprises a plurality of aromatic polyamide fibers 2 shown in the first embodiment. The material is sewn with a homogenous aromatic polyamide fiber braided yarn 4 so as to cover the entire surface of the cast high-pressure gas container 1. Further, a thermosetting resin is applied with the brush 3 including the stitched portion, and a reinforced fiber plastic layer is formed on the entire surface of the high-pressure gas container 1.

  According to the present embodiment as described above, the aromatic polyamide is formed by matching the branching portion, the protruding portion, and the uneven portion of the high-pressure gas container 1 that is originally difficult to cover with the aromatic polyamide fiber 2 to the target shape. By stitching with the fiber braided yarn 4, it is possible to easily combine the entire surface of the high-pressure gas container 1 with the reinforcing fiber plastic layer.

(3) Third Embodiment A gas insulated switchgear according to a third embodiment of the present invention is a liner made of rubber or the like before attaching or winding the aromatic polyamide fiber 2 in the first or second embodiment. The material is pasted or wound around the high-pressure gas container 1 in advance.

  That is, after the liner material as described above is wound around the surface of the high-pressure gas container 1, the aromatic polyamide fiber 2 is pasted or wound, and then the thermosetting resin is applied with the brush 3 to reinforce the fiber. A plastic is formed.

  According to the present embodiment as described above, a gap can be provided by interposing a liner material between the high-pressure gas container 1 made of casting and the reinforcing fiber plastic covering the surface thereof. Thus, the entire reinforcing fiber plastic is not affected by the thermal expansion and contraction of the high-pressure gas container 1 itself made of casting, and the life of the gas insulating device as a whole can be extended.

(4) Fourth Embodiment A gas insulated switchgear according to a third embodiment of the present invention is characterized in that a corrosion resistant paint is applied to the surface of the reinforced fiber plastic in each of the above embodiments. As this corrosion-resistant coating material, for example, vinyl ester resin (Lipoxy: trademark) manufactured by Showa Polymer Co., Ltd. can be used.

  According to the present embodiment as described above, by applying a corrosion-resistant paint to the surface of the reinforced fiber plastic formed on the surface of the high-pressure gas container 1, it is particularly resistant to corrosion and weather resistance and UV resistance for equipment installed outdoors. The reliability of the gas insulation device as a whole can be improved and the life can be extended.

(5) Other Embodiments The present invention is not limited to the aspect shown in the above embodiment, and includes the following, for example. That is, in the above-described embodiment, the aromatic polyamide fiber 2 is exemplified as the one covering the high-pressure gas container 1, but in the present invention, instead of this, for example, modified polyphenylene ether (Zylon: trademark) fiber, Spectra fiber, Polyketone fibers can be selectively used.

  The xylon fiber is generally superior in mechanical properties (such as dimensional stability) as compared with the polyamide fiber, and a flexible reinforcing fiber plastic layer can be formed on the surface of the high-pressure gas container 1. . In addition, Spectra fibers are resistant to ultraviolet rays of chemical substances and exhibit excellent characteristics in general water resistance and general physical properties as compared with aramid fibers represented by Kevlar fibers. Furthermore, the polyketone fiber can be manufactured at low cost because the raw materials are cheaper than carbon monoxide and ethylene as compared with the aromatic polyamide fiber.

  In addition, with respect to the aromatic polyamide fiber braided yarn 4 in the second embodiment, instead of using the aromatic polyamide fiber 2, a xylon fiber, a Spectra fiber, or a polyketone fiber is selectively used. Spectra fibers and polyketone fibers can be used as appropriate. Thereby, it becomes possible to form the reinforced fiber plastic layer formed on the surface of the high-pressure gas container 1 with the yarns of the braided fibers of the same quality as the various fiber materials used.

  In the above embodiment, the thermosetting resin is applied to the surface of the synthetic fiber after each synthetic fiber is attached or wound around the high-pressure gas container. However, the present invention is not limited to such a case. For example, the synthetic fiber may be pre-impregnated with a thermosetting resin in a semi-cured state, and the synthetic fiber containing the semi-cured thermosetting resin may be attached or wound around a high-pressure gas container.

  Thereby, the formation of the reinforcing fiber plastic layer on the surface of the high-pressure gas container is a single step of attaching the synthetic fiber without passing through the two steps of attaching the synthetic fiber and applying the thermosetting resin. Can be done.

The figure which shows the structure of the high pressure gas container of the gas insulated switchgear in the 1st Embodiment of this invention. The elements on larger scale of the high pressure gas container of the gas insulated switchgear in the 1st Embodiment of this invention. The elements on larger scale of the high pressure gas container of the gas insulated switchgear in the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... High pressure gas container 2 ... Aromatic polyamide fiber 3 ... Brush 4 ... Aromatic polyamide fiber braided yarn

Claims (8)

The high-pressure gas container is made of casting,
A reinforced fiber plastic layer is formed on the surface of the high-pressure gas container with a synthetic fiber having high strength and heat resistance that covers the entire high-pressure gas container and a thermosetting resin applied to the synthetic fiber. Gas insulated switchgear.   The gas-insulated switchgear according to claim 1, wherein the synthetic fiber is made of any one of an aromatic polyamide fiber, a modified polyphenylene ether fiber, a spectrum fiber, or a polyketone fiber. The synthetic fiber consists of a plurality of sheets,
The gas insulated switchgear according to claim 1 or 2, wherein the plurality of synthetic fibers are stitched together with a braided yarn made of a synthetic fiber of the same material.   The gas-insulated switchgear according to claim 3, wherein the knitted yarn is knitted by any one of an aromatic polyamide fiber, a modified polyphenylene ether fiber, a Spectra fiber, or a polyketone fiber. apparatus.   The gas insulated switchgear according to any one of claims 1 to 4, wherein the thermosetting resin is made of a polyester resin or a vinyl ester resin.   6. The gas insulated switchgear according to claim 1, wherein a gap is provided between a surface of the high-pressure gas container and the reinforcing fiber plastic layer with a liner material interposed therebetween. .   The gas insulated switchgear according to any one of claims 1 to 6, wherein a corrosion-resistant paint is applied to the surface of the reinforcing fiber plastic layer. A gas insulated switchgear manufacturing method for forming a reinforcing fiber plastic layer on the surface of a high-pressure gas container made of a casting,
A process of attaching or winding a synthetic fiber having high strength and heat resistance on the surface of the high-pressure gas container so as to cover the entire high-pressure gas container;
And a step of applying a thermosetting resin to the synthetic fiber attached or wound around the high-pressure gas container.

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