JP4579402B2 - Lightning arrester manufacturing method and lightning arrester - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of manufacturing an organic mold type lightning arrester and an organic mold type lightning arrester that are attached to a power transmission line or installed in a power plant, substation, or the like.
[0002]
[Prior art]
Generally, in a power system such as a power transmission line, a lightning arrester is installed to remove overvoltage and protect the power system and electrical equipment.
Conventionally, as the above lightning arrester, generally, lightning protection elements are stacked inside the FRP cylinder, electrode fittings are fixed to both ends of the FRP cylinder, and the lightning protection element and the FRP cylinder are covered with a resin such as silicone rubber or EP rubber. Things are known.
On the other hand, a lightning arrester using a plurality of fastening members such as insulating rods and straps has been proposed in place of the FRP cylinder in order to simplify the structure and facilitate assembly, and further reduce the size and weight. Yes. This lightning arrester stacks lightning protection elements between the electrode fittings, connects the electrode fittings at both ends with the fastening members, pressurizes the lightning protection elements in the axial direction, and the outer periphery thereof is made of a resin such as silicone rubber or EP rubber. (See, for example, JP-A-63-312602, JP-T-10-504939, etc.).
[0003]
[Problems to be solved by the invention]
The lightning arrester with a structure in which the electrode fittings at both ends are connected by a fastening member has a simple structure and can be reduced in size and weight compared to a conventional FRP cylinder. Because of the structure connected with an insulating rod, etc., the rigidity is low before resin molding, and when transporting or storing it in the manufacturing process, or fixing the insulating rod etc. to the electrode bracket, for example, laying it down There has been a problem that the position of the lightning protection elements stacked on the inside is deformed.
In particular, in order to facilitate assembly, if the number of the insulating rods is reduced, there is a problem that deformation is further facilitated and the position of the lightning arrester is shifted.
The present invention has been made in view of the above-described circumstances, and an object of the present invention is to improve the assemblability of a lightning arrester in which lightning protection elements are stacked in layers between electrode fittings and electrode fittings at both ends are connected by insulating rods. Both are to provide a lightning protection element manufacturing method and a lightning protection device that can increase rigidity and prevent deformation and displacement of the lightning protection element.
[0004]
[Means for Solving the Problems]
In the lightning arrester having a structure in which the electrode fittings at both ends are connected by an insulating rod, if the number of the insulating rods is increased, the rigidity can be increased, and the above-described deformation and displacement of the lightning arresting element can be prevented. Assembly becomes worse.
Therefore, in the present invention, the insulating rod is divided into an insulating rod for fastening and a reinforcing insulating rod for enhancing rigidity. First, electrode fittings at both ends are connected by an insulating rod for fastening, lightning protection elements are stacked between the electrode fittings, the insulating rod for fastening is temporarily fixed to the electrode fitting, and the lightning protection is made by a spring. The elements are pressurized. Next, a reinforcing insulating rod is attached between the electrode fittings.
By attaching a reinforcing insulating rod as described above, the rigidity of the assembly before molding can be increased, preventing deformation during transportation, storage, or work, and preventing the lightning arrester from being displaced. can do. Subsequently, the insulating rod for tightening is firmly fixed to the electrode fitting by pressure bonding or the like, and the outer periphery of the lightning protection element is resin-molded.
As described above, in the present invention, since the lightning protection elements are stacked between the electrode fittings with only the insulating bars for tightening attached, stacking is performed by inserting the lightning protection elements from between the insulating bars. The lightning protection elements can be easily stacked. Then, after stacking the lightning protection elements, pressurizing the lightning protection elements and attaching the reinforcing insulating rod, it is possible to increase the rigidity of the lightning arrester assembly before molding and the lightning arrester after molding, as described above. It is possible to prevent deformation and displacement of the lightning protection element.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a diagram showing the structure of a lightning arrester according to an embodiment of the present invention. FIG. 1 (a) is a cross-sectional view of the lightning arrester, FIG. 1 (b) is a cross-sectional view taken along line AA of FIG. FIG. 3C shows the internal configuration (part) of the lightning arrester.
In FIG. 1, 1a is a disk-shaped upper electrode, 1b is a disk-shaped lower electrode, screws 2a, 2b penetrate through the upper electrode 1a and lower electrode 1b, and the other ends of the screws 2a, 2b are It is fixed to disk-shaped metal plates 3a and 3b. A spring 4 is provided between the upper electrode 1a and the metal plate 3a.
A plurality of lightning protection elements 6 are stacked between the metal plates 3a and 3b with a disk-shaped metal plate 5 interposed therebetween. The lightning arrester 6 is a current limiting element having a non-linear voltage-current characteristic mainly composed of zinc oxide.
[0006]
The upper electrode 1a, the lower electrode 1b, the metal plates 3a and 3b, and the metal plate 5 are provided with through holes 7, for fastening a lightning protection element formed of FRP or the like as shown in FIGS. The insulating rod 8 and the reinforcing insulating rod 9 penetrate the through hole 7.
Then, both ends of the lightning element clamping insulating rod 8 are firmly fixed to the upper electrode 1a and the lower electrode 1b by pressure bonding or the like, and both ends of the reinforcing insulating rod 9 are bonded to the upper electrode 1a and the lower electrode 1b with an adhesive or the like. It is fixed.
The lightning protection element 6, the metal plates 3a and 3b, the metal plate 5, and the insulating rods 8 and 9 are integrally molded with a resin 10 such as silicone rubber, and a part of the upper electrode 1a and the lower electrode 1b is exposed to the outside. .
[0007]
FIG. 2 is a diagram for explaining a method of manufacturing a lightning arrester according to the present embodiment. The lightning arrester shown in FIG. 1 is manufactured as follows.
First, an insulation rod 8 for tightening a lightning protection element is inserted into a through hole 7 provided in the upper electrode 1a, the metal plate 3a, the metal plate 3b, the metal plate 5, and the lower electrode 1b, and one end of the insulation rod 8 is connected to the lower electrode 1b. The assembly shown in FIG. 2 (a) is prepared. Then, the lightning protection element 6 is inserted between the metal plates 3a, 5 and 3b, the other end of the insulation rod 8 for tightening the lightning protection element is temporarily fixed to the upper electrode 1a, and the screw 4 provided on the lower electrode side is tightened. The lightning protection element 6 is pressurized in the axial direction by the spring 4. Here, in order to make it easy to insert the lightning protection element 6, it is preferable that the number of the insulation rods 8 for tightening the lightning protection elements is 3 to 4.
[0008]
Next, as shown in FIG. 2B, a reinforcing insulating rod 9 is inserted into a through hole 7 ′ provided in the upper electrode 1a, the metal plate 3a, the metal plate 3b, the metal plate 5, and the lower electrode 1b, Both ends are fixed to the upper electrode 1a and the lower electrode 1b by bonding or the like.
Thereby, the rigidity of the assembly composed of the upper electrode 1a, the metal plate 3a, the metal plate 3b, the metal plate 5, the lower electrode 1b, the lightning arresting element 6, and the insulating rods 8 and 9 can be increased and transported or stored. Or when the both ends of the insulating rod 8 are pressure-bonded to the upper electrode 1a and the lower electrode 1b as described below, for example, even if it is laid down, the assembly is deformed or the lightning protection element 6 is displaced. Can be prevented.
Next, both ends of the lightning element fastening insulating rod 8 are firmly fixed by the upper electrode 1a and the lower electrode 1b by crimping or the like. Then, the lightning protection element 6, the metal plates 3a and 3b, the metal plate 5, and the insulating rods 8 and 9 are integrally molded with a resin 9 such as silicone rubber, leaving a part of the upper electrode 1a and the lower electrode 1b.
[0009]
In addition, although the said Example demonstrated the case where the metal plate 5 was provided between the lightning arresting elements 6, it replaced with the said metal plate 5, and the metal or insulating material which opened the hole larger than the outer diameter of a lightning arresting element in the center part. You may use the ring-shaped member formed by. If the mechanical strength can be ensured, the metal plate 5 need not be provided.
Moreover, the structure for pressurizing the lightning protection element 6 in the axial direction is not limited to that described in the above embodiment, and various other configurations can be adopted.
[0010]
【The invention's effect】
As described above, in the present invention, in a lightning protection device in which lightning protection elements are stacked between electrode fittings, electrode fittings on both ends are connected with insulating rods, and the outer periphery of the lightning protection device and the insulating rod is molded with resin, The rod is divided into an insulating rod for tightening and an insulating rod for reinforcement to increase rigidity. First, electrode fittings at both ends are connected by an insulating rod for fastening, and lightning protection elements are stacked between the electrode fittings. Then, the lightning protection element is pressurized, and then a reinforcing insulating rod is attached between the electrode fittings, and the outer periphery of the lightning protection element is resin-molded, so that the lightning protection elements can be easily stacked. The rigidity of the lightning arrester assembly before molding can be increased.
For this reason, it is possible to prevent the lightning arrester assembly before the resin mold from being deformed and the position of the lightning protection element from being displaced during transportation, storage, or work. A decrease in performance can be prevented. Furthermore, the rigidity of the lightning arrester after molding can be increased.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a lightning arrester according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a method for manufacturing a lightning arrester according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1a Upper electrode 1b Lower electrode 2a, 2b Screw 3a, 3b Metal plate 4 Spring 5 Metal plate 6 Lightning arrester 7 Through hole 8 Insulating rod 9 for lightning arrester tightening Insulating rod 10 for reinforcement Resin

Claims (2)

A method of manufacturing a lightning arrester in which lightning protection elements are stacked in layers between electrode fittings, electrode fittings at both ends are connected with insulating rods, and the outer periphery of the lightning protection device and the insulating rod is molded with resin,
The electrode fittings are connected by a plurality of lightening element fastening insulation rods provided so that lightning protection elements can be inserted , the lightning protection elements are stacked between the electrode fittings, and the insulation rods are temporarily attached to the electrode fittings. Stop and pressurize the lightning protection element in the axial direction,
After adding a reinforcing insulating rod between the electrode fittings to increase the rigidity of the assembly, both ends of the lightening element fastening insulating rods are fixed to the electrode fitting, and the insulating rod and the lightning arresting element are fixed. A method of manufacturing a lightning arrester, characterized in that the outer periphery of the battery is molded with resin. A lightning protection device in which lightning protection elements are stacked between electrode fittings, electrode fittings on both ends are connected with insulating rods, and the outer periphery of the lightning protection device and the insulating rod is molded with resin,
The insulation rod is composed of a plurality of insulation rods for tightening the lightning protection elements provided so that lightning protection elements can be inserted, and a reinforcing insulation rod thinner than the insulation rods. A lightning arrester characterized in that the element is pressed in the axial direction, and the rigidity of the assembly before the resin mold and the lightning arrester after the resin mold is increased by the reinforcing insulating rod and the lightning arrester is prevented from being displaced.

Images