JP2003077710A - Arrester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To relax a load generated on a fulcrum of an arrester element, when a bending load is applied to one side of the arrester, and to prevent damage to the arrester element. SOLUTION: Terminal fittings 2a and 2b are connected by a plurality of insulation bars 1, and arrester elements 3 are piled up between the terminal fittings 2a and 2b. A groove 6 having a larger outside periphery and smaller inside periphery than those of the arrester element 3 is arranged, and an elastic material 7 such as rubber and the like are filled in the groove 6. Surroundings of he arrester elements 3 and the insulation bars 1 are integrally molded by the mold material such as silicon rubber and the like. This construction can prevent damage to the arrester elements 3, even when one side of the arrester is bent to rotate the arrester element 3 on its edge as fulcrum, due to the contact of corners of the arrester elements 3 to the elastic material 7, to relax the load generated on the edge of the arrester elements 3.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightning arrester that is installed on an overhead transmission line or the like, protects the overhead transmission line from lightning strikes, and reduces lightning damage to the transmission line. The present invention relates to a structure of a lightning arrester that prevents a lightning arrester from being broken by a bending load. 2. Description of the Related Art A lightning arrester in which terminal fittings at both ends are connected to each other with a plurality of insulating rods, lightning arresters are stacked between the terminal fittings, and silicone resin or the like is molded directly around the lightning arrester and the insulating rod. Devices are known. FIG. 2 shows a cross-sectional configuration example of the lightning arrester. In FIG. 2, 1 is an insulating rod such as FRP, 2
Reference numerals a and 2b denote terminal fittings. In the terminal fittings 2a and 2b,
Both ends of the insulating rod 1 are firmly fixed by crimping or the like. A terminal fitting 2 connected via an insulating rod 1
A lightning arrester 3 including a plurality of zinc oxide elements and a spring 4 are provided between a and 2b. The lightning arrester 3 is pressed by the spring 4 and the lightning arresters are brought into close contact with each other. An assembly composed of the insulating rod 1, the terminal fittings 2a and 2b, and the lightning arrester 3 is integrally molded with the molding material 5 except for a part of the terminal fittings 2a and 2b as shown in FIG. [0004] The lightning arrester having the above structure is deformed when a bending load is applied to one side of the lightning arrester because the outer periphery is molded with a molding material such as silicone rubber resin, and the other side. At the end of the lightning arrester, the lightning arrester rotates in the direction of the bending load with its edge as a fulcrum. then,
As shown in FIG. 3, the lightning arrester 3 and the terminal fitting 2b are in point contact with each other, and an excessive compressive force is applied to the portion A serving as a fulcrum of the lightning arrester, and the lightning arrester 3 is destroyed. The present invention has been made to solve the above-described problems, and an object of the present invention is to reduce a load generated at a fulcrum portion of a lightning arrester when a bending load is applied to one side of the lightning arrester, and the lightning arrester is destroyed It is to prevent that. [0005] In order to solve the above-mentioned problems, in the present invention, a surface of a terminal fitting which comes into contact with a lightning arrester has an outer periphery which is slightly larger than the element and an inner periphery which is slightly smaller than the element. The groove is provided, and the groove is filled with an elastic material. In the present invention, since it is configured as described above, when a bending load is applied to one side of the lightning arrester, the portion serving as the fulcrum of the lightning arrester does not directly contact the terminal fitting, but comes into contact via the elastic material, The load on the lightning arrester can be reduced,
Destruction of the lightning arrester can be prevented. FIG. 1A is a diagram showing a sectional structure of a lightning arrester according to an embodiment of the present invention, and FIG. 1B is an enlarged view of a portion A in FIG. 1A. . In FIG. 1, 1 is an insulating rod made of FRP, 2a and 2b are terminal fittings, and as described above,
Both ends of the insulating rod 1 are fixed to the terminal fittings 2a and 2b by crimping or the like. A plurality of lightning arresters 3 and springs 4 are provided between the terminal fittings 2a and 2b, and the springs 4 bring the lightning arresters 3 into close contact with each other. A groove 6 having an outer circumference slightly larger than the lightning arrester 3 and an inner circumference slightly smaller than the lightning arrester 3 is provided on the surface of the terminal fitting 2b in contact with the lightning arrester, and the groove 6 is filled with an elastic material 7 such as rubber. Have been. The area where the lightning arrester 3 and the terminal fittings 2a and 2b are in contact with each other is large enough to ensure electrical performance. A molding material 5 such as silicon rubber is integrally molded around the lightning arrester 3 and the insulating rod 1 configured as described above. Since the lightning arrester of this embodiment has the above configuration, a bending load is applied to one side of the lightning arrester, and even if the lightning arrester 3 rotates in the direction of the bending load with its edge as a fulcrum as shown in FIG. The corners of the element 3 come into contact with the elastic member 7 and the load generated at the edge of the lightning arrester 3 is reduced.
The lightning arrester can be prevented from being destroyed. As described above, according to the present invention, a groove having an outer periphery slightly larger than the lightning arrester and an inner periphery slightly smaller than the lightning arrester is provided on the surface of the terminal fitting in contact with the lightning arrester. Since the groove is filled with an elastic material, a bending load is applied to the lightning arrester, and even if the lightning arrester tries to rotate around its edge as a fulcrum, the fulcrum part comes into contact with the rubber elastic material, so the load generated at the fulcrum of the lightning arrester Is alleviated, and the element can be prevented from being broken.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a configuration of an arrester according to an embodiment of the present invention. FIG. 2 is a diagram showing an example of a conventional lightning arrester. FIG. 3 is a diagram showing a state when a bending load is applied to a lightning arrester. [Description of Signs] 1 Insulating rods 2a, 2b Terminal fitting 3 Zinc oxide element 4 Spring 5 Molding material 6 Groove 7 Elastic material

Claims (1)

Claims 1. A lightning arrestor in which terminal fittings at both ends are connected by a plurality of insulating rods, lightning arresters are stacked on the terminal fittings, and rubber is molded directly around the lightning arresters and the insulating rods. A lightning arrester characterized in that a groove having an outer circumference slightly larger than the lightning arrester and an inner circumference slightly smaller than the lightning arrester is provided on the surface of the terminal fitting in contact with the lightning arrester, and the groove is filled with an elastic material.