JPH02148810A - High voltage section supporting device for gas insulated electric equipment - Google Patents

Abstract

PURPOSE:To suppress generation of a wedgelike gas gap, to simplify a structure and to enhance insulating strength by supporting a section to be applied by a high voltage by a solid insulator through insulator having higher hardness than that of a substance for composing the section and elastic properties. CONSTITUTION:In order to attach an electrostatic shield 1 to be applied by a high voltage and a solid insulator 2, they are secured by means such as adhering, bolt clamping, etc. through rubbers 3 such as silicone rubber, etc. of insulating substance having higher hardness than that of a material for composing an electromagnetic shield and elastic properties between both. The shield 1 is formed of a metal material 4 in a smoothly curved surface, and the rubber 3 in which the shield 1 is contained in a U-shaped recess 3a and insulating film 7 is wound on the periphery is employed. With this structure, the shield 1, the rubber 3 and the insulator 2, the rubber 3 are respectively secured in close contact with each other, no wedgelike gas gap is formed near the shield 1 to which a high electric field is applied to prevent the insulator from breaking down.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a high-voltage part support device for gas-insulated electrical equipment that mechanically supports the part to which high voltage is applied using a solid insulator. .

(Prior Art) In gas-insulated electrical equipment for specific power using a gas such as SF6 gas as an insulating medium, a structure is adopted in which a portion to which a high voltage is applied is mechanically supported by a solid insulator. The dielectric constant of a solid insulator is higher than that of an insulating gas, so if the solid insulator used for support and the high-voltage part of the electrical equipment are not in perfect contact, there will be a problem between the solid insulator and the high-voltage part. A gap is created and this gas becomes trapped. The gas accumulated in the gap between the solid insulator and the high voltage section formed into a wedge shape, where the electric field was concentrated and could easily cause dielectric breakdown. Therefore, an electric field shield or the like is installed to prevent the electric field from being applied to this wedge-shaped gas gap.
A recess is provided in the high-voltage part of the equipment to accommodate the part that makes contact with the insulator.

(Problem to be solved by the invention) However, in gas-insulated electrical + IA equipment using composite insulation that uses a large amount of solid insulators, it is impossible to avoid a structure in which the solid insulators are in direct contact with the high voltage section where a high 1 tn- is applied. It was a national crisis. Ninth, a wedge-shaped gas gear is placed between the high voltage part and the solid insulator, and the solid insulator is brought into contact with the flat plate part of the high voltage part to prevent a gap, and the curved part of the high voltage part is made of solid insulator. The structure was designed to prevent insulating materials from coming into contact with each other.

However, in order to achieve the above structure, the solid insulator must be placed exactly on the flat plate part of the high voltage part, and pressure must be applied to prevent it from shifting due to vibrations, etc. It is necessary to take measures such as adhering with adhesive, which makes the structure complicated, and even with this method, it is difficult to reliably eliminate the gas gap and prevent dielectric breakdown.

Therefore, one object of the present invention is to prevent the formation of a wedge-shaped gas gap in the area where the high voltage part of gas insulated electrical equipment and the solid insulator come in contact with each other in a place where an electric field is applied, and to provide gas insulated electrical equipment with a simple structure and high insulation strength. The overall purpose is to obtain a high-sample support device for equipment.

[Structure of the Invention (!1! Means for Solving the Problems) In order to achieve all of the above objects, the present invention provides a method for mechanically supporting the part to which high voltage is applied with a solid insulator. It is characterized in that the part to which a high voltage is applied is brought into contact with the solid insulator through an insulator that is less hard and has elasticity than the entire constituent materials.

(Function) By doing this, all the pressure is applied to the part to which high voltage is applied, and the insulating material, which is less hard and has elasticity than the material composing the high voltage part, forms the part to which high voltage is applied. Together they deform and form a dense layer. By doing this, a wedge-shaped gas gap is not formed in the area where a high electric field is applied, which prevents dielectric breakdown and improves reliability.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

In Figure 1, J is an electrostatic shield that is attached to gas-insulated electrical equipment, and this #electronic shield 1 is mechanically supported by a solid insulator 2 and is attached to areas where electric fields are concentrated, such as the ends of windings. 9. High voltage is applied. In the present invention, when attaching the electrostatic shield 1 to which a high voltage is applied and the solid insulator 2, an insulating material having low hardness and elasticity is used to form the electrostatic shield 1 between them. It is fixed via a rubber material 3 such as a certain silicone rubber by means such as adhesion or bolt tightening.

FIG. 2 shows an example of the structure of the electrostatic shield. The electrostatic / - lead J is, for example, made of copper or aluminum metal plate material 4 as shown in Figure V with a smooth curved surface, or the same shape as shown in Figure (b). There is a material in which a N4 foil 6 is laminated on the bottom surface of an insulating material 5 made of glass or pressboard. Figures 3 (al and 3) show the configuration of the rubber 3 interposed between the solid insulator 2 and the electrostatic shield 1. The one shown in Figure VC (a) has a U-shaped cross section; Letter-shaped recess 3hV
c Place the electrostatic shield J shown in Figure 2 on a person n, and place a fourth shield around him.
By wrapping the insulating film 7 as shown in Figure ta), the electrostatic shield 1 and the rubber 3 can be trapped.

The one shown in Fig. 3(b) has an inverted cross-section, and is made by combining two pieces of rubber 3 as shown in JIN (bl), sandwiching them from both sides of an electrostatic seal tonneau, and surrounding them with an insulating film 7. By winding it, the electrostatic shield 1 and the rubber 3 can be made into a completely dense layer.

With this configuration, the electrostatic shield 1 is supported by the solid insulator 2 with the elastic rubber 3 interposed between the electrostatic shield J and the rubber 3, and the solid insulator 2 and the rubber 3. are closely fixed to each other, and therefore no wedge-shaped gas gap is formed in the vicinity of the electrostatic shield l where a high electric field is applied, thereby preventing dielectric breakdown due to concentration of the electric field.

The present invention is a gas insulated electric al! In addition to the bare electrostatic shield of the device, there is also a shield with an insulating film wrapped around the electrostatic shield.
Insulators with lower hardness and elasticity than the materials that make up the electrostatic shield, even if coated! A similar effect can be obtained by using ftM. In addition, materials that have lower hardness and elasticity than the materials that make up the entire electrostatic shield do not need to have this property permanently, and such materials are completely blind during manufacture and harden when completed, such as epoxy resin. It is also possible to use synthetic materials.

Furthermore, the configuration of the present invention is not limited to electrostatic shielding, but can also be implemented in transformers with bare windings or with 8k covered windings. However, if the material of the supporting high-voltage part has a lower hardness than the material of the high-voltage part, and if a material with elasticity alone would cause too much mechanical deformation, attaching a material with high hardness to this material and reinforcing it will increase the mechanical strength. can be increased.

[Effects of the Invention] As described above, according to the present invention, in a high-voltage part support device of a gas-insulated electrical equipment having a structure in which the part to which a high voltage is applied is mechanically supported by a solid insulator, the part to which a high voltage is applied is The part where high voltage is applied is supported by a solid insulator through an insulator that is less hard and elastic than the material that causes partial sound*g, so the structure is simple and the wedge-shaped gas gap is suppressed. Thus, a high voltage part support device t for gas insulated electrical equipment with high insulation strength can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view showing one embodiment of the present invention, WJ2 Fig. (al, (bl) is a front view showing the configuration of the electrostatic shield, respectively, and Fig. 3 (ta+, (bl) is a front view showing the configuration of the rubber, respectively. The cross-sectional views, FIGS. 4(at) and (b), are the electrostatic shield shown in FIG. 2 and the rubber shown in FIG. 3, respectively.
It is a sectional view showing k. J... Silence 1! 7-Led% 2... Solid insulator, 3...
・Rubber. 4... Metal material, 5... Insulating material, 6... Metal agent, 7... Insulating film.

Claims (1)

[Claims] In a high-voltage part support device for gas-insulated electrical equipment that has a structure in which the part to which high voltage is applied is mechanically supported by a solid insulator, the hardness is lower than the material constituting the part to which high voltage is applied,
A high voltage part support device for gas insulated electrical equipment, characterized in that a part to which high voltage is applied via an elastic insulator is supported by a solid insulator.