JPS6359712A - Three-phase insulating spacer - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an improvement of a three-phase insulating spacer used in a closed gas insulated switchgear.

(Prior art) Generally, gas insulated switchgear is made by compressing and sealing a gas with high dielectric strength, such as SFsF2 gas, in a metal sealed container. There is a tendency to use high compression. Therefore, insulating spacers commonly used for the purpose of gas division and conductor support are required to have sufficient strength even under high pressure conditions.

FIG. 3(a) shows an example of a conventional three-phase insulating spacer.

Shown in (b). A cone portion 3.4.5 for supporting three conductors 2 is arranged on the cone-shaped substrate portion 1, and is fixed by a flange portion 7 of a tank 6. Generally, when a pressure P is applied to a flat insulating spacer with a radius of R and a thickness of T, the maximum stress σlaX obtained at the center is given by araay, a:P (R/T) 2 .

It is proportional to the square of R/T, and this relationship is the maximum stress σ1IIa
The relationship that x is proportional to the square of R/T also applies to cone-shaped insulating spacers.

(Problem to be solved by the invention) From the above relationship, in order to increase the mechanical strength of the insulating spacer and use it under high pressure conditions, it is sufficient to increase the plate thickness T and decrease the radius R. Although it is thought that mechanical strength can be obtained, it is difficult to increase the plate thickness T and decrease the radius R as described above from the viewpoint of electrical properties.

In addition, as shown in Fig. 3, the maximum stress σIaX occurs at the center of the insulating spacer, so in the three-phase insulating spacer, geometric asymmetry occurs at the center or between the cone portions 3 and the cone portions 4 and 5. Local stress concentration occurs due to the difference in rigidity between the cone portions 3 to 5. This is because the cone parts 3 to 5 on which the conductor 2 is supported are arranged at the vertices of an isosceles triangle and are formed geometrically asymmetrically. As shown in the figure, an application has been previously filed in which the structure is symmetrical and prevents local stress concentration. That is, FIG. 4 shows four cone portions 11 and 12.
．． 13 and 14 are equally arranged, and embedded metal is provided in the cone parts 11, 12 and 13 except for the cone part 14 so as to support the conductor. However, in the case of FIG.
Since there is a difference in rigidity between the cone portion 14 which is not used for supporting the conductor, stress concentration occurs due to the asymmetry in rigidity.

Therefore, an object of the present invention is to provide a three-phase insulating spacer with high mechanical strength without increasing the plate thickness.

(Structure of the invention) (Problems to be solved) In order to achieve the above object, the present invention arranges a three-phase conductor inside a conduit filled with insulating gas, and connects the conduit between each other. A three-phase insulating spacer that connects and sections each other and supports three-phase conductors arranged in the conduit, comprising: a crown-shaped substrate part; and a flange part arranged at the periphery of this substrate part and connected to the conduit. are integrally formed, and have a raised part with a convex cross section in the center of the bottom surface of the board part, and the three-phase conductor is fixed through the bottom face of the board part except for this raised part, and The plate thickness at the center of the raised portion is thicker than the plate thickness near the connecting portion between the flange portion and the base plate portion.

(Function) According to the above configuration, a three-phase insulating spacer with high strength can be obtained without increasing the plate thickness.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view showing one embodiment of the three-phase insulating spacer according to the present invention, which is composed of a substrate portion B and a flange portion F. The base plate B has a crown shape as a whole, and is integrally formed with a flange F disposed around the periphery of the base base B for connecting to the conduit 20, and has a cross section at the center of the bottom surface of the base plate 8. It has a raised part 21 which is raised in a convex shape, and an embedded metal fitting 2 is installed on the bottom surface of the substrate part B excluding this raised part 21.
2, a three-phase conductor 23 is fixed through the tank 20, and the thickness at the center of the raised portion 21 is thicker than the thickness near the connecting portion between the flange portion F and the substrate portion 8. has been done.

Further, the thickness of the cone portion 25 is increased so that the rigidity of the embedded metal fitting 22 of the cone portion (corresponding to 11, 12, 13 in FIG. 4) is equal to that of the cone portion.

With this configuration, local concentrated stress is dispersed, the fracture strength is high, and there is no unnecessary increase in plate thickness at the end of the spacer. This is clear from the stress distribution diagrams shown in FIGS. 2(a) and (b), where (a) is an example of the case of the prior application shown in FIG. 4, and (b) is an example of the case of the present invention. be. 2 in the diagram
6.27 is the vector, 28.29 is the compressive force, and 30.31 is the tensile force. This figure shows that the stress concentration in the center of the substrate part B is reduced in the present application compared to the earlier application.
Stress can be distributed over the entire substrate portion B, thereby improving fracture strength.

〔Effect of the invention〕

According to the present invention described above, a three-phase conductor is disposed inside a conduit filled with an insulating gas, the conduits are interconnected and sectioned, and the three-phase conductor disposed within the conduit is connected to each other. In the supporting three-phase insulating spacer, a crown-shaped substrate portion and a flange portion disposed around the periphery of the substrate portion for connecting to the pipe line are integrally formed, and a cross section is formed at the center of the bottom surface of the substrate portion. The three-phase conductor has a convexly raised part, and the three-phase conductor is fixed through the bottom surface of the board part except for this raised part, and the plate thickness at the center of the raised part is the connection between the flange part and the board part. Since the plate thickness is made thicker than the plate thickness near the part, a high-strength three-phase insulating spacer can be provided without increasing the plate thickness.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a three-phase insulating spacer according to the present invention, FIG. 2 is a stress distribution diagram for explaining the action of the embodiment, and FIG. 3(a). (b) is a vertical cross-sectional view and a cross-sectional view showing an example of a conventional three-phase insulating spacer, and FIG. 4 is a vertical cross-sectional view and a cross-sectional view showing an example of the three-phase insulating spacer of the prior application. B... Board part, F... Flange part, 20... Tank, 21... Raised part, 22... Embedded metal fitting, 23...
・Three-phase conductor, 24...flange, 25...cone part. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2 (a) (a) Written amendment? , 1 is also j? Completed yo

Claims (2)

[Claims] (1) A three-phase insulating spacer that arranges a three-phase conductor inside a conduit filled with insulating gas, connects and sections the conduits, and supports the three-phase conductor placed within the conduit. A crown-shaped base plate and a flange disposed on the periphery of the base plate for connecting to the pipe are integrally formed, and a bulge having a convex cross section is formed at the center of the bottom surface of the base plate. The three-phase conductor is fixed through the bottom surface of the board part except for this raised part, and the plate thickness at the center of the raised part is greater than the plate thickness near the connection part between the flange part and the board part. A three-phase insulating spacer characterized by being thick. (2) forming four cone parts at equal intervals on the bottom surface of the substrate part except for the raised part, and fixing the three-phase conductor through three of the cone parts except for one; A three-phase insulating spacer characterized in that the plate thickness of each cone part is changed so that the rigidity of each cone part is the same.