JP2006333568A - Gas insulated switchgear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To acquire a gas insulated switchgear provided with an insulating support member using an insulating coating not containing glass and disposed on an outer face of a glass fiber reinforced cured resin, and having a sufficient barrier effect against the large quantity of a SF<SB>4</SB>gas generated when a large current such as an accidental current is interrupted. <P>SOLUTION: The insulating support member comprises an insulating rod SR for supporting and electrically insulating a current carrying high-voltage conductor disposed within a metal container for internally sealing an insulating gas from the metal container, and is formed from the glass fiber reinforced cured resin. The insulating coating 3 is disposed on the outer face of the glass fiber reinforced cured resin, does not contain glass, and has a thickness of at least 100 μm. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a gas-insulated switchgear, and more particularly, an insulating support that insulates and supports a high-voltage application portion made of a high-voltage conductor for energization disposed in a conductive container enclosing an insulating gas therein from the conductive container The present invention relates to a gas insulated switchgear provided with a member.

Insulating rod of gas insulated switchgear using SF ₆ gas as an insulating medium is used for the purpose of insulating and supporting a high voltage conductor for energization arranged in a metal container filled with insulating gas inside from the metal container In general, a glass fiber reinforced resin cured product having material characteristics excellent in both electrical insulation and mechanical strength is widely used.

SF ₆ gas is a gas medium excellent in insulation performance and arc extinguishing performance, but is decomposed by an arc generated when the current is interrupted to generate active SF ₄ gas. SF ₄ gas reacts with moisture in the metal container and hydrolyzes into SOF ₂ gas or HF gas. This HF significantly damages the glass constituting the insulating rod.
For this reason, when the insulating rod comprised from a glass fiber reinforced resin hardened | cured material is used in an arc generation | occurrence | production part, there exists a possibility that the glass fiber in resin may be damaged and a mechanical characteristic may fall.
In addition, the surface resistance of the insulating rod is lowered due to the influence of the conductive substance generated by the reaction between glass and HF, and partial discharge and tracking are generated. Finally, there is a possibility that the insulating rod may cause creepage failure.
Therefore, when using an insulating rod composed of a glass fiber reinforced resin cured product at the arc generating portion, it is necessary to prevent the glass fiber from being damaged by HF.

As means for solving such a problem, it has been proposed to coat a cured glass fiber with a material excellent in HF resistance (see, for example, Patent Document 1).
By covering the outer surface of the glass fiber reinforced resin cured product with epoxy-modified polyimide, the epoxy-modified polyimide functions as a barrier against HF gas, thereby preventing glass damage due to HF gas.

JP 7-161250 A

The conventional insulating rod exhibits a certain degree of effect against glass damage caused by HF gas by coating with an epoxy-modified polyimide resin. However, there is a drawback that a sufficient barrier effect cannot be obtained for a large amount of SF ₄ gas generated at the time of interruption of a large current such as an accidental current interruption.

FIG. 2 shows the test result regarding the barrier property of the epoxy-modified polyimide in comparison with the sample in the embodiment according to the present invention. The surface resistivity in the mixed gas of SF ₄ and SF ₆ as shown in Table 1 is shown in FIG. The change with time is shown. When Sample-A and Sample-C are compared, a good barrier effect due to the epoxy-modified polyimide coating is observed.
That is, in the uncoated sample-C, the surface resistivity is reduced by 7 digits due to the mixed gas exposure, whereas in the coated sample-A, the decrease in the surface resistivity is about 2 digits.
However, the SF ₄ gas concentration is 0.4 [Vol. %], The barrier effect is not so remarkable, and the surface resistivity is reduced to 10 ¹² Ω / sq or less. In a gas-insulated switchgear, the SF ₄ gas concentration is 0.4 [Vol. %], And sufficient barrier properties cannot be obtained with epoxy-modified polyimide coating.
In addition, when the surface resistivity is reduced to 10 ¹² Ω / sq or less, partial discharge and tracking are observed, and the probability that the insulating rod will cause creeping breakage is remarkably increased. Therefore, the epoxy-modified polyimide coating has a problem that the barrier property at the time of interrupting a large current is not sufficient, and there is a possibility that the insulating rod may cause creepage failure.

This invention has been made to solve the above-described problems, and is generated at the time of interruption of a large current such as an accident current interruption by an insulating coating not including glass disposed on the outer surface of the cured glass fiber reinforced resin. it is intended to obtain a gas-insulated switchgear comprising an insulating support member having a sufficient barrier effect against large amounts of SF ₄ gas.

  In the gas-insulated switchgear according to the present invention, the insulating support member that electrically insulates and supports the high-voltage application portion disposed in the conductive container enclosing the insulating gas therein from the conductive container is made of glass fiber. It consists of a reinforced resin cured product, and an insulating coating not containing glass is disposed on the outer surface of the glass fiber reinforced resin cured product.

According to the present invention, the insulating coating that does not include glass disposed on the outer surface of the glass fiber reinforced resin cured product has a sufficient barrier effect against a large amount of SF ₄ gas generated at the time of interruption of a large current such as an accidental current interruption. A gas insulated switchgear provided with an insulating support member can be obtained.

Embodiment 1 FIG.
A first embodiment of the present invention will be described with reference to FIGS. 1 is a cross-sectional view showing a configuration of an insulating rod for a gas-insulated switchgear according to Embodiment 1. FIG. FIG. 2 is a characteristic diagram showing the surface resistance characteristics of the insulating rod for gas insulated switchgear according to Embodiment 1 in comparison with the prior art.

In FIG. 1 showing the configuration of the insulating rod SR for gas-insulated switchgear according to Embodiment 1 of the present invention, an energizing high-voltage conductor (not shown) disposed in a metal container enclosing an insulating gas made of SF ₆ therein. The insulating rod SR that electrically insulates the metal container from the metal container and supports it is composed of a cured glass fiber reinforced resin in which the glass fiber 2 is embedded in the epoxy resin 1 and molded. As glass fiber 2, E glass fiber excellent in insulation is generally used.
On the outer surface of the glass fiber reinforced resin cured product, an epoxy resin 3 having aluminum oxide as a filler is disposed at a thickness of at least 100 μm. Here, as the aluminum oxide, fused alumina having an average particle diameter of 10 μm is used. As epoxy resin, bisphenol A type epoxy resin is the main agent, ether acetate is used as the curing agent, and liquid resin obtained by diluting with a mixed solvent of xylene and alcohol is manufactured. Thus, the insulating rod SR is manufactured.

As a characteristic of the insulating rod manufactured in this way, a change with time in surface resistivity in a mixed gas of SF ₄ and SF ₆ as shown in Table 2 was measured.
From the measurement result of FIG. 2, the improvement of the barrier property by the coating material of this invention is recognized. Sample-B is the same material as shown in Table 1, and SF ₄ gas concentration is 0.4 [Vol. %], The surface resistivity is reduced to 10 ¹² Ω / sq or less.
On the other hand, Sample-D which is an embodiment of the present invention has a barrier effect due to a thick coating, and a synergistic effect of a coating material excellent in SF ₄ gas resistance (aluminum oxide is hardly damaged by SF ₄ gas). The surface resistivity is maintained at 10 ¹² Ω / sq or more, and there is no fear of partial discharge or tracking. Therefore, the coating with the aluminum oxide-filled epoxy resin of the present invention has a sufficient barrier property against a large amount of SF ₄ gas generated when a large current is interrupted.

According to the first embodiment of the present invention, a high voltage application portion made of a high voltage conductor for energization disposed in a conductive vessel made of a metal vessel filled with an insulating gas is electrically connected from the conductive vessel. An insulating support member composed of an insulating rod SR that insulates and supports is composed of a cured glass fiber reinforced resin obtained by embedding glass fibers 2 in an epoxy resin 1 and molding the glass on the outer surface of the cured glass fiber reinforced resin. Since the insulating coating 3 having a thickness of at least 100 μm not included is disposed, the insulating coating having a predetermined thickness not including the glass disposed on the outer surface of the glass fiber reinforced resin cured product can be used for large interruption current interruption. A gas-insulated switchgear having an insulating support member having a sufficient barrier effect against a large amount of SF ₄ gas generated when current is interrupted can be obtained.

According to Embodiment 1 of the present invention, in the configuration of the preceding paragraph, since the insulating coating 3 not containing glass is made of an epoxy resin containing aluminum oxide as a filler, the outer surface of the glass fiber reinforced resin cured product Insulating coating having a predetermined thickness composed of an epoxy resin filled with aluminum oxide disposed on the surface has a sufficient barrier effect against a large amount of SF ₄ gas generated at the time of interruption of a large current such as an accidental current interruption A gas insulated switchgear provided with an insulating support member can be obtained.

Embodiment 2. FIG.
A second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a cross-sectional view showing a configuration of an insulating rod SR for gas-insulated switchgear according to the second embodiment.
In the second embodiment, the configuration other than the specific configuration described here has the same configuration contents as the configuration in the first embodiment described above, and exhibits the same operation. In the drawings, the same reference numerals indicate the same or corresponding parts.

  In FIG. 3 which shows the structure of the insulating rod SR for gas insulated switchgear according to the second embodiment of the present invention, the fluororesin 4 is arranged at a thickness of at least 100 μm or more on the outer surface of the glass fiber reinforced resin cured product. Yes. Here, as the fluororesin, a fluororesin for coating [Lumiflon (trade name), manufactured by Asahi Glass Co., Ltd.] is used.

Regard fluorine-based insulating rod SR coated with a resin, similar to that shown in FIG. 2 in the first embodiment, SF ₄ 10 ¹² Ω / sq or more surface resistivity in the gas is ensured, excellent for SF ₄ gas It has excellent barrier properties.

According to the second embodiment of the present invention, in the configuration in the first embodiment, since the insulating coating not including the glass is composed of the fluororesin 4, it is disposed on the outer surface of the cured glass fiber reinforced resin. Gas insulation opening and closing provided with an insulating support member having a sufficient barrier effect against a large amount of SF ₄ gas generated at the time of interruption of a large current such as an accident current interruption by an insulating coating made of a fluorine-based resin having a predetermined thickness A device can be obtained.

Embodiment 3 FIG.
A third embodiment of the present invention will be described with reference to FIG. FIG. 4 is a cross-sectional view showing the configuration of the insulating rod SR for gas-insulated switchgear according to the third embodiment.
In the third embodiment, the configuration other than the specific configuration described here has the same configuration contents as the configuration in the first embodiment described above, and has the same function. In the drawings, the same reference numerals indicate the same or corresponding parts.

In FIG. 4 which shows the structure of the insulating rod SR for gas insulated switchgear according to Embodiment 3 of the present invention, the outer surface of the glass fiber reinforced resin cured product has an aluminum oxide-filled epoxy resin 3 as the inner coating and an outer coating as the outer coating. The fluororesin 4 is disposed with a thickness of at least 100 μm.
Here, as the fluororesin, a fluororesin for coating [Lumiflon (trade name), manufactured by Asahi Glass Co., Ltd.] is used, and a surface resistivity of 10 ¹² Ω / sq or more is secured in SF ₄ gas. Excellent barrier properties against ₄ gases.

According to the third embodiment of the present invention, in the configuration of the first embodiment, the insulating coating that does not include the glass is an inner coating composed of an epoxy resin 3 containing aluminum oxide as a filler and a fluororesin 4. Since it is comprised by the outer coating | cover comprised, it is comprised with the epoxy resin which uses aluminum oxide as an inner coating | cover as an inner coating | cover arrange | positioned on the outer surface of the glass fiber reinforced resin cured | curing material, and the fluorine resin 4 as outer coating By the insulating coating having a predetermined thickness, it is possible to obtain a gas-insulated switchgear having an insulating support member having a sufficient barrier effect against a large amount of SF ₄ gas generated when a large current is interrupted such as an accidental current interruption .

Embodiment 4 FIG.
A fourth embodiment of the present invention will be described with reference to FIG. FIG. 5 is a cross-sectional view showing a configuration of an insulating rod SR for gas-insulated switchgear according to the fourth embodiment.
In the fourth embodiment, the configuration other than the specific configuration described here has the same configuration contents as the configuration in the first embodiment described above, and exhibits the same operation. In the drawings, the same reference numerals indicate the same or corresponding parts.

In FIG. 5 which shows the structure of the insulating rod SR for gas insulated switchgear according to the fourth embodiment of the present invention, at least the epoxy resin 5 and the fluororesin 4 not containing a filler are present on the outer surface of the glass fiber reinforced resin cured product. It is arranged with a thickness of 100 μm or more.
Since the epoxy resin 5 does not include a filler, stirring and mixing of the filler are unnecessary, and the process can be shortened compared to the first embodiment. SF ₄ ^{10 12} Ω / sq or more surface resistivity in the gas is secured, and has excellent barrier properties against SF ₄ gas.

According to the fourth embodiment of the present invention, in the configuration in the first embodiment, the insulating coating that does not include the glass is configured by an inner coating composed of an epoxy resin 5 that does not include a filler and a fluororesin 4. The outer coating is composed of an epoxy resin filled with aluminum oxide as the inner coating disposed on the outer surface of the cured glass fiber reinforced resin and a fluororesin as the outer coating. With the insulating coating having a thickness, it is possible to obtain a gas-insulated switchgear having an insulating support member having a sufficient barrier effect against a large amount of SF ₄ gas generated when a large current is interrupted such as an accidental current interrupt.

Embodiment 5. FIG.
Embodiment 5 according to the present invention will be described.
In the fifth embodiment, the configuration other than the specific configuration described here has the same configuration contents as the configuration in the first embodiment described above, and exhibits the same operation.

In Embodiment 5 according to the present invention, an insulating support member made of an insulating rod for electrically insulating and supporting a high-voltage conductor for energization disposed in a metal container enclosing an insulating gas therein is made of glass. An insulating coating having a thickness of at least 100 μm and not including glass is disposed on the outer surface of the cured glass fiber reinforced resin, and the insulating coating is composed of polyimide amide.
This insulating coating, SF ₄ ^{10 12} Ω / sq or more surface resistivity in the gas is ensured, it is possible to obtain excellent barrier properties against SF ₄ gas.

According to Embodiment 5 of the present invention, since the insulating coating that does not include the glass is made of polyimide amide, the insulating coating having a predetermined thickness made of polyimide amide can prevent accidental current interruption. it can be obtained a gas-insulated switchgear device comprising an insulating support member having a sufficient barrier effect against large amounts of SF ₄ gas generated when a large current interruption.

As an application example of the present invention, there can be mentioned an insulating rod of a gas switching device (GIS, GCB) using SF ₆ gas as an insulating medium.

  The insulating rod for gas insulated switchgear according to the present invention is composed of a glass fiber reinforced resin cured product, and an insulating member that does not contain glass of at least 100 μm or more is disposed on the outer surface of the glass fiber reinforced resin cured product. A sufficient barrier effect against the concentration SF gas is provided.

According to the present invention, in order to ensure a sufficient barrier effect against high-concentration SF ₄ gas, the outer surface is provided with a coating of at least 100 μm, and the coating material is excellent in barrier properties due to the thick coating and SF ₄ gas resistance Due to this synergistic effect, excellent insulation and mechanical properties can be ensured without lowering the surface resistivity even in the presence of high-concentration SF gas.

It is sectional drawing which shows the structure of the insulating rod for gas insulated switchgear in Embodiment 1 by this invention. It is a characteristic diagram which shows the surface resistivity of the insulating rod for gas insulated switchgear in Embodiment 1 by this invention compared with a prior art. It is sectional drawing which shows the structure of the insulating rod for gas insulated switchgear in Embodiment 2 by this invention. It is sectional drawing which shows the structure of the insulating rod for gas insulated switchgear in Embodiment 3 by this invention. It is sectional drawing which shows the structure of the insulating rod for gas insulated switchgear in Embodiment 4 by this invention.

Explanation of symbols

1 Epoxy resin, 2 Glass fiber, 3 Epoxy resin coating with aluminum oxide as filler, 4 Fluorine resin coating, 5 Epoxy resin coating without filler.

Claims (7)

  An insulating support member configured to electrically insulate and support a high voltage application portion disposed in a conductive container encapsulating an insulating gas therein from the conductive container is formed of a glass fiber reinforced resin cured product. A gas insulated switchgear characterized in that an insulating coating not containing glass is disposed on the outer surface of a cured fiber reinforced resin.   An insulating support member configured to electrically insulate and support a high voltage application portion disposed in a conductive container encapsulating an insulating gas therein from the conductive container is formed of a glass fiber reinforced resin cured product. A gas insulated switchgear characterized in that an insulating coating having a thickness of at least 100 μm and not including glass is disposed on the outer surface of the cured fiber reinforced resin.   The gas insulated switchgear according to claim 1 or 2, wherein the insulating coating not containing glass is made of an epoxy resin containing aluminum oxide as a filler.   The gas insulated switchgear according to claim 1 or 2, wherein the insulating coating not containing glass is made of a fluorine-based resin.   The insulating coating that does not contain glass is composed of an inner coating made of an epoxy resin containing aluminum oxide as a filler and an outer coating made of a fluororesin. Item 3. A gas insulated switchgear according to Item 2.   3. The insulating coating that does not contain glass is constituted by an inner coating made of an epoxy resin not containing a filler and an outer coating made of a fluororesin. A gas insulated switchgear according to claim 1. The gas insulated switchgear according to claim 1 or 2, wherein the insulating coating not containing glass is made of polyimide amide.

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