JPS622604A - Manufacture of insulator type arrestor - 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 [Technical Field of the Invention] The present invention relates to a method for manufacturing an insulator type lightning arrester for power transmission lines or distribution lines, which requires no maintenance or inspection.

[Technical background of the invention and its problems] The structure of an insulator type lightning arrester that has been commonly used in the past is shown in FIG.

That is, after storing the non-linear resistor 3 together with the spring 9 in the internal space 7 of the insulator 2, backings 15 are provided at both ends C above and below the insulator 2, and the metal plate 14 is pressed against the backing 15 with a predetermined force to create an airtight seal. It is a structure that holds. In this structure, there are various quality control problems to ensure airtight performance, and management costs are high. That is, backing 15. Insulator 2. The airtight performance is sensitively affected by the dimensions, material quality, and presence or absence of scratches of the metal plate 14, so extensive quality control is essential.

Furthermore, even if there is no problem with airtightness, the rubber material of the backing 15 is porous, and for many years (:) the permeation of moisture cannot be ignored. It is necessary to do this.

Also press the backing with a strong metal plate ■ 4
The structure of the lightning arrester tends to be large and heavy.

For this reason, a lightning arrester is known in which the non-linear resistor 3 and the insulator 2 are sintered together (see Japanese Patent Publication No. 31806/1983), and this will be explained based on FIG. 4-1.

Components that are the same as those in FIG. 3 are given the same reference numerals and their explanations will be omitted.

In FIG. 4, the zinc oxide element 3 and the insulator 2 are bonded together using an adhesive 2.
0 etc. to form it into one piece. However, although this type of lightning arrester is compact, it has the following drawbacks.

(1) Due to the difference in coefficient of thermal expansion between the non-linear resistor 3 and the insulator 2, cracks are likely to occur and breakage occurs under various temperature stresses.

(2) If the layer of sintering agent 20≦juvoid exists, electric field stress is constantly applied, so corona is generated and deterioration is likely to occur.

(3) Gaps between the elements of the non-linear resistor 3 (-If the sintering agent 20 enters, it will be insulated, and the corona will easily leak into the gap, causing deterioration.

[Object of the Invention] The present invention has been made in view of the above-mentioned circumstances.The object of the present invention is to provide a completely airtight structure, high reliability, and low-cost housing in an insulator-type evacuator using an insulator as a container. An object of the present invention is to provide a method for manufacturing a lightning arrester that can be manufactured.

Summary of the Invention] In order to achieve the above object (;, the method of the present invention provides a method for manufacturing an insulator-type lightning arrester in which a non-linear resistor is housed in an insulator (
- The container containing the nonlinear resistor inside the insulator is sealed and evacuated, and then an insulating fluid is injected.

[Embodiments of the Invention] Hereinafter, a method of implementing the present invention will be described with reference to the drawings.

FIG. 1 (-) First step: Inner space 7 of insulator 2 ≦ Two non-linear resistors 3 are accommodated. One end is connected to electric line 11 and two through a hole provided in the upper part of insulator 2. Connect the conductor 8 to the non-linear resistor 3. Connect the non-linear resistor 3 to the lid 4 (; To make a good electrical connection (2. Install a spring 9 between the non-linear resistor 3 and the insulator 2. A pipe 5 is attached to the lid 4 to form a hole penetrating the inside and outside of the lid 4.

The internal space 7 is closed with this lid 4.

Step 21: The space between the insulator 2 and the lid 4 and the hole through which the connecting conductor 8 passes are filled with a low melting point material 6 and sealed. .

In this state, the internal space 7 and the atmosphere communicate only through the pipe 5. The hole through which the connecting conductor 8 passes does not necessarily have to be sealed in the second step, but may be sealed in the first step. The material for the lid 4 is preferably a material that easily fuses with the low melting point material 6, such as glass material or porcelain similar to the insulator. As the low melting point material 6, it is preferable to use a material with a lower melting point that does not affect the properties of the internal zinc oxide element.
A material with a melting point of about 800° C. or lower may be selected. For example, soda glass. Water glass is preferred.

Third step: The sealed internal space 7 is evacuated via the pipe 5.

4th step: Next, inside the internal space 7 (-8F) through the pipe 5.
6 Fill with insulating fluid such as gas.

Fifth step: After filling the insulating fluid, the pipe 5 is crushed to make the interior space 7 airtight. Electrical connection is possible by connecting the metal pipe 5 to the connecting conductor 8 at the same time.

[Effects of the Invention] As described above, according to the present invention C, the lid and the insulator are welded with a low melting point material (a complete seal can be obtained from the second,
A highly reliable insulator type lightning arrester with an airtight structure can be manufactured at low cost.

[Other embodiments of the present invention] Figure 2 shows an example of a lightning arrester built into a suspended insulator.

In the figure, nine cases are shown in which two non-linear resistors 3 are used in two locations to electrically connect them in parallel. It is a compact, airtight and highly reliable device that combines the functions of a lightning arrester and a suspension insulator for power transmission lines.14

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the lightning arrester manufactured according to the present invention, FIG. 2 is a sectional view showing another embodiment of the lightning arrester manufactured according to the present invention, and FIGS. 3 and 4 are sectional views showing a conventional method. This is a cross-sectional view of a lightning arrester manufactured by 1... Electric line 2... Insulator 3... Non-linear resistor 4... Lid 5... Pipe 6... Low melting point material 7...
Internal space 8... Connection conductor 9... Spring 10.
・・Xitai insulator 11・・Upper metal fitting 12・・Lower metal fitting 13・
... Cementing 14 ... Metal plate 15 ... Rubber seal 16 ... Adsorbent 20 ... Adhesive agent Patent attorney Noriyuki Chika (and 1 other person) Figure 1 Figure 2 Figure 3 Figure 49 figure

Claims (5)

[Claims] (1) A method for manufacturing an insulator type lightning arrester in which a non-linear resistor is housed in an insulator, characterized in that the insulator type lightning arrester is manufactured by a manufacturing process including the following first to fifth steps. Method of manufacturing lightning arresters. First step: A step of storing a non-linear resistor in the internal space of the insulator. Second step: After the above step is completed, a step of bonding the insulator and a lid having small holes to seal the internal space. Third step: A step of evacuating the space sealed in the step by evacuating the small hole. Fourth step: a step of injecting an insulating fluid into the space evacuated in the step through the small hole. Fifth step: a step of sealing the small hole after the end of the step. (2) The method for manufacturing an insulator type lightning arrester according to claim 1, wherein the lid is made of glass or porcelain. (3) The method for manufacturing an insulator type lightning arrester according to claim 1, characterized in that in the second step, the insulator and the lid are bonded together using a low melting point material such as soda glass or water glass. (4) The method for manufacturing an insulator type lightning arrester according to claim 1, wherein the small hole is a pipe. (5) The method for manufacturing an insulator type lightning arrester according to claim 4, wherein the pipe sealed in the fifth step is used as a connecting conductor.