JPH09139130A - Power equipment component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power equipment component exhibiting excellent electric insulation property even in a high electric stress condition by providing a section comprizing a layer made of an inorganic insulation material interposed between an epoxy resin molding and an electroconductive member. SOLUTION: An inorganic insulating material layer 22 is formed between an electroconductive member 21 and an epoxy resin molding 13. A material for the inorganic insulating material layer 22 is selected out of a group comprizing liquid glass, SiO2 , Al2 , O3 , TiN, and TiO2 . The electroconductive member 21, which constitutes high voltage parts and installation parts, is formed of a metal, an electroconductive resin, and an electroconductive paint, while the epoxy resin molding 13 is composed of an epoxy resin, a curing agent, a filler, and other additives. This power equipment component exhibits excellent electric insulation property even in a high electric stress condition, promotes miniaturization of power equipment, and can improve reliability.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to various cable accessories, gas-insulated switches (GIs), and GIs.
S) Spacers, insulators, transformers, and other power equipment components.

[0002]

2. Description of the Related Art In general, electric power equipment parts include a member (epoxy resin molded body) made of epoxy resin, and a high-voltage portion and a ground portion (conductive member) made of a conductive material, which are integrated. It has a structured structure. Therefore, in the electric power equipment component, there is a joint where the epoxy resin and the conductive material are in contact with each other. Examples of power equipment parts having such a joint include a prefabricated joint for CV cables and a GIS spacer. The epoxy resin molded body in such a power device component is generally formed by molding an epoxy resin mixed with an inorganic filler by a casting method, an injection method or the like.

Further, in the conventional electric power equipment parts, a layer made of a silver-based or carbon-based conductive paint is provided between the epoxy resin molded body and the conductive member to form the epoxy resin molded body and the conductive member. The adhesiveness between the two is improved, the electric field is relaxed, and the contact surfaces of the epoxy resin molded body and the conductive member are smoothed.

By the way, in recent years, from the viewpoint of space saving,
There is an increasing demand for miniaturization of electric power equipment. Further, from the viewpoint of improving power transmission efficiency, there is an increasing demand for higher power transmission voltage. For these reasons, electrical stress applied to electric power equipment parts tends to increase. With such progress of so-called high stress, power equipment parts are required to have high insulation performance. This insulation performance is determined not only by the dielectric breakdown characteristics of the epoxy resin, but is also influenced by the electrode shape, electrode material, etc. of the conductive member, so the configuration of the entire power equipment component is important.

One of the factors that greatly affects the insulating performance is the structure of the joint between the conductive material and the insulating material, and various structures have been studied so far. However, with the conventional structure, it is difficult to cope with the recent increase in stress, and improvement of the structure of the joint is desired. The present invention has been made in view of the above points, and an object of the present invention is to provide a power equipment component that exhibits excellent electrical insulation even in a state where electrical stress is high.

[0006]

The inventors of the present invention have noticed that the cause of the dielectric breakdown of electric power equipment parts is near the interface between the epoxy resin molding and the conductive member, and The present invention has been found to provide a structure of a power device component that can withstand dielectric breakdown by improvement, and has completed the present invention.

That is, the present invention provides a power equipment component characterized by having a portion formed by interposing a layer made of an inorganic insulating material between an epoxy resin molding and a conductive member.

In the present invention, the epoxy resin molding is
An epoxy resin, a curing agent, a filler, and an epoxy resin composition composed of other additives are molded into a predetermined shape by a method such as a vacuum casting method, a pressure gel method, and an injection method. The type of constituent material and the molding method are not particularly limited.

Examples of the epoxy resin forming the epoxy resin molded body include bisphenol A type epoxy resin, bisphenol F type epoxy resin, alicyclic epoxy resin and novolac type epoxy resin.

As the curing agent constituting the epoxy resin molded article, polyamine type curing agents such as aliphatic polyamine, aromatic polyamine and polyamidoamine, acid anhydride type curing agents such as hexahydrophthalic anhydride and methyltetrahydrophthalic anhydride. Agents, phenolic hardeners such as phenol novolac and cresol novolac, Lewis acids such as boron trifluoride or salts thereof, dicyandiamides and the like.

Examples of the filler contained in the epoxy resin molding include silica, alumina, dolomite, alumina hydroxide, glass powder, glass fiber and the like. Further, examples of other additives contained in the epoxy resin molded body include a curing accelerator, a plasticizer, a diluent and a colorant.

In the present invention, the conductive member constitutes the high-voltage portion and the installation portion of the power equipment part, and can be formed of metal, conductive resin, or conductive paint. In the present invention, examples of the inorganic insulating material include water glass, SiO ₂ , Al ₂ O ₃ , TiN, and TiO ₂ . Examples of the method for forming a layer using this inorganic insulating material include physical vapor deposition (PVD), chemical vapor deposition (CVD), and sol-gel method.

Although the thickness of this layer varies depending on the type of the inorganic insulating material, the effect of the present invention can be obtained if the thickness is about 1 μm. In addition, specifically, when the inorganic insulating material is water glass, the effect is exhibited even when the layer thickness is about 0.8 μm.

When forming this inorganic insulating material layer,
It is necessary to form it by a method that does not have a thermal or chemical adverse effect on the conductive material or the conductive coating material forming the lower conductive member, or the epoxy resin forming the epoxy resin molded body.

As a method for producing the electric power equipment component of the present invention, for example, a conductive member having a desired shape is produced, and an inorganic insulating material layer is formed on at least the surface of the contacted surface by the above-mentioned method, This is set in a mold, a method of casting an epoxy resin in the mold, or an epoxy resin molded body of a desired shape is prepared, and the inorganic insulating material layer is at least formed on the surface of the contacted surface. Examples of the method include a method of forming by a method and further applying a conductive paint on it.

[0016]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a schematic view showing an example of a power equipment component of the present invention, specifically, C
The prefabricated joint of V cable is shown. 11 in the figure is C
A V cable is shown. This prefabricated joint is to provide a connecting portion 11a of the CV cable 11, an epoxy unit (epoxy resin molded body) 13 is provided on the CV cable 11 via a stress cone 12, and a silver-based conductive paint is provided thereon. A conductive paint layer 14 made of is provided.

The interface (a portion) between the epoxy resin molded body and the conductive member in this prefabricated joint has a structure as shown in FIG. That is, the inorganic insulating material layer 22 is formed on the aluminum center electrode 21 which is a conductive member.
And the epoxy unit 13 is formed on the inorganic insulating material layer 22.

In the prefabricated joint having the above-mentioned structure, since the inorganic insulating material layer 22 is interposed between the aluminum center electrode 21 and the epoxy unit 13, the excellent electrical insulating property can be obtained even under a high electric stress condition. Demonstrate.

Further, FIG. 3 is a schematic view showing another example of the electric power equipment component of the present invention, specifically, a GIS spacer. In this GIS spacer, an inorganic insulating material layer is provided between a center conductor 31 composed of aluminum which is a conductive material of a high voltage portion and a brass wire mesh which is a conductive material of a ground portion and a spacer body 32 made of an epoxy resin. 33
Is interposed. Even in this case, the presence of the inorganic insulating material layer 33 provides excellent electric insulation even in a state where electric stress is high.

Next, examples of the present invention will be described. (Example 1) First, an aluminum center electrode was prepared using aluminum A5056, water glass was applied on the surface thereof, and heat treatment was performed at 130 ° C for 2 hours to cure the water glass to a thickness of 1 µm. A glass layer was formed.

Next, this aluminum center electrode is placed in a mold, and an epoxy resin; Araldite CT200 is used.
An epoxy resin material having a composition of 100 parts by weight (manufactured by Ciba Geigy, trade name), 30 parts by weight of phthalic anhydride (manufactured by Nippon Steel Chemical Co., Ltd.), and 200 parts by weight of silica powder (quartz powder 3H, manufactured by Nagase & Co., Ltd.) is used. Figure 1 by the vacuum casting method
The epoxy resin molded body for prefabricated joint shown in was produced.

Further, on the outer periphery of the epoxy resin molding,
Silver-based conductive paint; DOTITE D-753 (manufactured by Fujikura Kasei Co., Ltd., product name) is applied at a thickness of 20 to 30 μm, and the temperature is 80 ° C.
It was subjected to heat treatment for 2 hours to be cured. (Example 2) First, an aluminum center electrode was prepared using aluminum A5056, the aluminum center electrode was placed in a mold, and the same epoxy resin material as in Example 1 was used. The epoxy resin molded body for prefabricated joint shown in was produced.

Next, water glass was applied on the surface of the epoxy resin molded body and heat-treated at 80 ° C. for 5 hours to cure the water glass to form a glass layer having a thickness of 1 μm.
Furthermore, a silver-based conductive paint; DOTITE D-753 (manufactured by Fujikura Kasei Co., Ltd., product name) is applied to the outer periphery of the epoxy resin molded body at a thickness of 20 to 30 μm, and heat treatment is performed at 80 ° C. for 2 hours. Cured. Comparative Example First, an aluminum center electrode was produced using aluminum A5056. Next, this aluminum center electrode was placed in a mold, and the same epoxy resin material as in Example 1 was used to produce an epoxy resin molded body for prefabricated joint shown in FIG. 1 by a vacuum casting method.

Further, on the outer periphery of the epoxy resin molding,
Silver-based conductive paint; DOTITE D-753 (manufactured by Fujikura Kasei Co., Ltd., product name) is applied at a thickness of 20 to 30 μm, and the temperature is 80 ° C.
It was subjected to heat treatment for 2 hours to be cured.

Prefabricated joints were manufactured by incorporating rubber stress cones, CV cables and the like into the epoxy resin moldings of Examples 1 and 2 and Comparative Example. A dielectric breakdown test was performed on these prefabricated joints. The results are shown in Table 1 below. In addition, the dielectric breakdown test is 50Hz
The alternating voltage was increased from 100 kV in steps of 5 kV / 5 minutes, and the value obtained by dividing the broken voltage by the thickness of the broken portion was shown as the dielectric breakdown strength.

[0026]

[Table 1]

As can be seen from Table 1, the electric power equipment parts (Examples 1 and 2) of the present invention exhibited excellent electric insulation even in the state where the electric stress was high. On the other hand, the conventional electric power equipment component (comparative example) was inferior in electrical insulation in the state where the electrical stress was high.

[0028]

As described above, the electric power equipment component of the present invention has the portion formed by interposing the layer made of the inorganic insulating material between the epoxy resin molded body and the conductive member, so that electric stress is not generated. Excellent electrical insulation even in high condition. Further, the electric power equipment component of the present invention can promote miniaturization of the electric power equipment and improve reliability.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an example of a power device component according to the present invention.

FIG. 2 is an enlarged view showing part a in FIG.

FIG. 3 is a schematic view showing another example of a power equipment component according to the present invention.

[Explanation of symbols]

11 ... CV cable, 11a ... Connection part, 12 ... Stress cone, 13 ... Epoxy unit, 14 ... Conductive paint layer, 21 ... Aluminum center electrode, 22, 33 ... Inorganic insulating material layer, 31 ... Center conductor, 32 ... Spacer body.

Claims (2)

[Claims] 1. A power device component comprising a portion formed by interposing a layer made of an inorganic insulating material between an epoxy resin molded body and a conductive member. 2. The inorganic insulating material is water glass, Si
The electric power equipment component according to claim 1, which is a material selected from the group consisting of O ₂ , Al ₂ O ₃ , TiN, and TiO ₂ .