JPS61264612A - Bushing explosion preventor for gas-filled insulation apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is directed to the insulating tubes of gas-filled insulating equipment, such as gas bushings, current transformers, and lightning arresters, which are filled with insulating gas due to some external force. This invention relates to a porcelain tube explosion-proof device for gas-filled insulating equipment that can minimize the scattering of fragments when it breaks and explodes.

(Prior technology) Gas bushings, gas bus cable heads, current transformers,
Insulating gas such as SF6 gas or N8 gas is sealed inside the lightning arrester, so if the insulator pipe cracks due to some external force, the internal pressure will accelerate the destruction and the fragments will be scattered around the surrounding area. There is a risk of an explosion causing the product to scatter. The scattering of such fragments may injure workers and may also destroy the insulating pipes of surrounding electrical equipment, causing secondary disasters.
As shown in Publication No. 9, an explosion-proof inner cylinder made of reinforced plastic is attached with a gap for filling insulating gas inside the insulator tube to absorb the energy of the explosion. There is. However, in the structure described above, the explosion-proof inner cylinder is installed with a certain gap from the inner wall of the insulator pipe, so in order to provide explosion-proof measures to the existing equipment, it is necessary to replace it with an insulator pipe with a larger inner diameter. Furthermore, the structure becomes complicated as it requires a support to hold the explosion-proof inner cylinder at a precise position within the insulator tube, and it is difficult to assemble the explosion-proof inner cylinder with foreign objects entering the gap between the explosion-proof inner cylinder and the inner wall of the insulator tube. However, there were problems such as a decrease in insulation performance. Therefore, the present inventors have created products such as those in which plastic is bonded to the inner surface of the insulator tube with adhesive, and those in which a plastic film is applied to the inner surface of the insulator tube to form a film. It has been found that this method has the drawback that minute voids are inevitably generated between the plastic film and the insulator tube, and minute discharges within the voids significantly impair the insulation performance of the entire insulator, and it is therefore impractical.

(Problems to be Solved by the Invention) The present invention solves these conventional problems and can minimize the scattering of insulator fragments in the event of an explosion, while simplifying the structure and reducing insulation due to voids. It was completed for the purpose of being an explosion-proof device for gas-filled insulated equipment that does not cause any deterioration in performance.

(Means for Solving the Problems) The present invention provides a first film made of a highly elastic polymeric material and a delicate film that protects the inner surface of an insulator tube used for gas-filled insulating equipment. The multi-layer film, which essentially includes a second film made of a high-strength polymeric material, is adhered to the insulating tube by the pressure of the insulating gas sealed inside the insulator without the need for an adhesive layer. This is a characteristic feature.

(Example) Next, the present invention will be described in detail with reference to the illustrated example of the gas-filled insulating bushing.
) is the center conductor inserted into this insulator tube (1). The upper end of the center conductor (2) is held in a conductor fitting part (4) on the lower surface of an upper metal fitting (3) that seals the upper end opening of the insulator tube (1). The lower end of the insulator tube (1) is attached to a mounting opening of a case (7) of a gas-filled insulating device via a fixture (5) and a ground flange (6). (8) is an insulator (1
) is a double-layer film closely adhered to the inner surface of the multi-layer film (8).
It essentially comprises at least a first coating (8a) with excellent elasticity and a second coating (8b) with excellent mechanical strength that protects its inner surface. The first film (8a) is made of a polymer material such as a rubber with excellent elasticity such as ethylene propylene rubber, chloroprene rubber, or nitrile rubber, or a synthetic resin that is relatively soft and has excellent elasticity such as urethane resin. It is preferable that the thickness of the film is about 1 to 5 to be able to absorb the energy at the time of explosion. The second film (8b) is made of a polymeric material such as vinyl chloride resin, polyethylene resin, or epoxy resin that has excellent mechanical strength and rigidity that can prevent deformation of the first film (8a). Thickness is usually 1)
The following may be used. These first film (8a) and second film (8b) may be reinforced by inserting a reinforcing material such as glass fiber, and in addition to the first film (8a) and second film (8b), for example, The third layer is made of a material with excellent chemical and oil resistance.
A film is provided on the inner surface of the second film (8b), and the first film (8b) is coated with S F b gas used as an insulating gas.
a) and the second film (8b) may be prevented from being eroded. In this way, the multilayer film (8) is protected against the essential first film (8b).
In addition to having a two-layer film consisting of a) and a second film (8b),
Such a multilayer film (8), which may have three or more layers
is an insulated pipe [1] by the pressure of the insulating gas sealed inside the gas-filled insulating equipment without intervening an adhesive layer.
It is closely attached to the inner surface of the To do this, as shown in Fig. 2, first insert the first coating material (9a) into the inside of the insulator tube (1), and then use the vacuum pump (1o) from the top of the insulator tube f1+ to remove the first coating material (9a). 9a) and insulator (1)
The material (9a) is brought into close contact with the inner surface of the insulator tube (1) by blowing air into the inside of the material (9a) while sucking the air between the material (9a) and the insulator tube (1). Cut the upper end of the material (9a) with a vacuum between the tubes, and if a rubber membrane is used, heat the entire insulator tube at 120 to 130°C for about 2 hours to vulcanize it, and then vulcanize it. A method can be adopted in which the material of the second film is brought into close contact with the inner surface of the first film (8a) using a similar method.

(Function) The device configured as described above includes a first coating (8a) made of a polymeric material with excellent elasticity and a second coating (8b) made of a polymeric material with excellent mechanical strength. multilayer film (8
) is provided on the inner surface of the insulator tube (1), so the pressure of the insulating gas may rise abnormally for some reason and the insulator tube (
Even if 1) explodes, the highly elastic first film (8a) in the multilayer film (8) will absorb the energy of the explosion due to its elasticity, minimizing the scattering of fragments and protecting the human body. It is possible to prevent danger to the equipment as well as secondary disasters such as damage to peripheral equipment. In addition, the second coating (8b) with excellent mechanical strength normally prevents external forces from acting on the first coating (8a), and the insulating gas sealed inside the insulating tube (1) Since direct contact with the first film (8a) is prevented, the elasticity of the first film (8a) will not deteriorate even if used for a long period of time. Furthermore, since the multilayer film (8) of the present invention is tightly adhered to the inner surface of the insulating tube (1) by the pressure of the insulating gas without intervening an adhesive layer, voids are created between the multilayer film (8) and the insulating tube (1). Furthermore, the multi-layer III (81) of the present invention is in close contact with the inner surface of the insulating gas tube (1) due to the pressure of the insulating gas. Therefore, there is no need to increase the size of the insulator (1), no special support means are required, and even if the insulator (1) is distorted, it can always be brought into close contact with the insulator (1).

(Effects of the Invention) As is clear from the above description, the present invention can minimize the scattering of insulator fragments during an explosion, has a simple structure, and has no risk of deterioration of insulation performance over a long period of time. Therefore, it will greatly contribute to the development of industry by eliminating the problems associated with insulating tube explosion-proof devices in conventional gas-filled insulating equipment.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is an explanatory view of the manufacturing process thereof. (1): Insulator pipe, (8): Multilayer film, (8a): First film, (8b): Second film. No.1I! A

Claims (1)

[Claims] A first coating (8a) made of a highly elastic polymeric material is coated on the inner surface of an insulator tube (1) used for gas-filled insulating equipment.
) and a second film (8b) made of a polymeric material with excellent mechanical strength that protects its inner surface. A porcelain tube explosion-proof device for gas-containing insulating equipment, characterized in that the pressure of an insulating gas allows the insulating tube to be brought into close contact without intervening an adhesive layer.