JPH0322681B2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) The present invention relates to a lightning arrester having a built-in lightning arrester element, and more particularly to a lightning arrester sometimes used in an insulator device for an overhead power transmission line. be.

(Prior Art) Previously, the applicant of the present application proposed the lightning arrester shown in FIG. 13 in Japanese Patent Application No. 60-84956 (Japanese Unexamined Patent Publication No. 61-243614) as a lightning arrester having a built-in lightning arrester element. In this lightning arrester, a clamping fitting 53 is screwed onto the lower inner circumferential surface of a cylindrical power-side mounting fitting 52 that is fitted and fixed to the lower end of a voltage-resistant insulating cylinder 51, and is housed within the voltage-resistant insulating cylinder 51. It is fitted into a spring holding fitting 55 provided at the lower end of the element assembly 54, and is prevented from loosening by a stop ring 56. A spring receiving fitting 57 is screwed onto the inner peripheral surface of the tightening fitting 53.

Further, a bottomed cylindrical current-side electrode 58 is screwed and fixed to the lower outer peripheral surface of the power-side mounting bracket 52, and the annular protrusion 58a near the center of the bottom of the electrode 58 and the spring receiving metal fitting 57 A plurality of disc springs 59 for preventing loosening of the energizing side electrode 58 are interposed between the two.

A rubber mold 60 is formed between the voltage-resistant insulation cylinder 51 and the element assembly 54, between the voltage-resistant insulation cylinder 51 and the element assembly 54, and on the outside of the voltage-resistant insulation cylinder 51.

(Problems to be Solved by the Invention) However, the above-mentioned lightning arrester has a problem in that it has a large number of parts, has a complicated structure, and requires time and effort to manufacture, resulting in high manufacturing costs.

An object of the present invention is to provide a lightning arrester that solves the above problems.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the first invention provides a cylindrical ground side electrode 22 and a bottomed cylindrical energizing electrode at the upper and lower ends of the voltage-resistant insulating tube 21, respectively. The side electrode 23 is fitted and fixed, and an element assembly 28 constituted by stacking a plurality of earth protection elements 29 in series between both electrodes is housed,
The energizing side electrode 23 is provided with a concave portion or a convex portion that restricts the position of the element presser metal fitting 31 provided at the lower end of the element assembly 28 in a concavity and convex relationship with the element presser metal fitting 31, and connects the element presser metal fitting 31. A female thread 22e is provided on the inner periphery of the side electrode 22, and a fastening fitting 25 is screwed into the side electrode 22. Electrode 23
A spring 39 for crimping the element assembly 28 is interposed between the terminal fitting 37 and the element assembly 28.
A configuration is adopted in which a rubber mold 42 is provided between and the voltage-resistant insulating cylinder 21 and around the outer periphery of the voltage-resistant insulating cylinder 21.

Further, in the second invention, after fitting and fixing the cylindrical ground side electrode 22 and the bottomed cylindrical energized side electrode 23 to the upper and lower ends of the voltage-resistant insulating tube 21, the plurality of lightning arrester elements 2 are fitted and fixed.
9 stacked in series is housed in the voltage-proof insulating cylinder 21 from the ground side electrode 22 using an operating rod, and the element holding fitting 31 provided at the bottom of the assembly 28 is placed in the above-mentioned manner due to the unevenness. The spring 39 and the terminal fitting 37 for receiving the spring 39 are inserted into the upper part of the element holding fitting 30 on the upper part of the element assembly 28 by engaging with the concave or convex part provided on the voltage-supplying electrode 23, and then the tightening fitting 2 is inserted.
5 into the female screw 22e provided on the ground side electrode 22, and push the terminal fitting 37 against the biasing force of the spring 39, and then connect the element assembly pair 28 to the energized side electrode 2.
3 and the terminal fitting 37 and then housed in a mold, and a rubber mold 42 is provided between the element assembly pair 28 and the voltage-resistant insulating cylinder 21 and on the outer periphery of the voltage-resistant insulating cylinder 21. .

(Function) Since the above-mentioned means is adopted, in the first invention, even if external forces such as bending or tension due to loading during construction, earthquakes, or electric wire vibrations are applied, these are all borne by the voltage-resistant insulating tube and the rubber mold. Therefore, the coating and the element are not affected, the coating and the element are prevented from being cracked, and the lightning arrester is prevented from being damaged. Furthermore, even if an arc occurs in the element part, the voltage-resistant insulating tube bears the burden, so no scattering damage occurs.

Moreover, the second invention houses the element assembly from the grounding side electrode into the voltage-resistant insulating cylinder in which a cylindrical ground side electrode and a bottomed cylindrical energized side electrode are fitted and fixed at both upper and lower ends, respectively. Then, the element holding fitting provided at the bottom of the assembly is easily engaged with the concave or convex portion provided on the power-supplying electrode due to the unevenness, and the tightening fitting is attached to the female screw provided on the grounding side electrode. By simply screwing together, the element assembly is fixed between the energizing side electrode and the terminal fitting disposed on the upper part of the element assembly.

(Example) Hereinafter, an example embodying the first invention will be described in the first to
This will be explained according to FIG. As shown in FIG. 1, a hanging metal fitting 2 is tightened and fixed to the steel tower 1 with bolts 3, and a hanging metal fitting 4 is supported on the hanging metal fitting 2 so as to be perpendicular to the hanging metal fitting 2. A connecting yoke 6 is supported on the hanging fitting 4 via connecting pins 5, and connecting pins 8 are provided at both left and right ends of the connecting yoke 6, respectively.
The hanging insulators 7, 7 are rotatably supported via.

First connecting links 10, 10 are supported at the lower ends of both hanging insulators 7, 7 via connecting pins 9, respectively, and connecting pins 11, 11 are supported on both links 10, 10.
The connecting yoke 12 is supported via the connecting yoke 12. A second connecting link 14 is supported on the connecting yoke 12 via a connecting pin 13, a clamp 16 is supported on the link 14 via a connecting pin 15, and an electric wire 17 is suspended from the clamp 16. There is. A square electrode 12a is provided at the center of the upper surface of the connection yoke 12.
is provided.

Further, a bracket 18 is provided at the center of the connecting yoke 6.
A lightning arrester 20 is attached to the lightning arrester 20.

Next, to explain the lightning arrester 20 in detail, as shown in Figs. 3 and 4, a voltage-resistant insulating tube made of a material such as reinforced plastic (FRP) that has excellent mechanical strength, heat resistance, and pressure resistance. 2
A cylindrical ground side electrode 22 having a stepped portion 22a is fitted to the upper end of the cylindrical electrode 1, and a cylindrical energized side electrode 23 with a bottom is fitted to the lower end of the cylindrical electrode 1, and is fixed with an adhesive 24. Note that an annular groove 21a is formed on the outer circumferential surface of both ends of the voltage-resistant insulating tube 21, and annular grooves 22b and 23a are also formed on the inner circumferential surfaces of the ground side electrode 22 and the energized side electrode 23 to increase the bonding area. It strengthens the adhesion. A mounting flange 22c is formed on the upper outer periphery of the ground side electrode 22, and the flange 22c has a plurality of bolts (in this embodiment) for fixing the earth arresting insulator 20 to the bracket 18 with bolts 49 (see FIG. 1). 8) Bolt insertion hole 22d
is provided. Moreover, the upper part of the voltage-resistant insulation cylinder 21,
In the center and lower part, in the diametrical direction of the insulating tube 21.
Gas escape holes 21b (see FIG. 5) are formed every 180°. It is efficient to provide the gas escape hole 21b near the ground side electrode 22 and the charged side electrode 23 and near the intermediate part thereof. Note that the gas escape holes 21b may be formed every 90° in the diameter direction.

A cylindrical engagement tube 23b is in contact with the energizing side electrode 23 near the center of the bottom thereof. Also, around the engagement tube 23b is a rubber mold 4, which will be described later.
A plurality of through holes 23c are provided in order to allow gas to escape and to spread the rubber throughout during formation of the rubber. Furthermore, the horn mounting bracket 26 welded to the lower surface of the energizing side electrode 23 has a bolt insertion hole 26a.
is provided through the discharge electrode 2 as shown in Figures 1 and 2.
7 is attached with bolts 50 to form an air discharge gap G between the connecting yoke 12 and the discharge electrode 12a.

An element assembly holder 28 is accommodated within the voltage-resistant insulating cylinder 21 . This element assembly 28 includes a plurality of lightning arrester elements 29 which are mainly made of zinc oxide and have non-linear voltage-current characteristics, which are stacked in series, and are joined to the upper part of the lightning arrester element 29, and are connected to an accommodating recess 30a and an accommodating recess. An element holding fitting 30 having a screw hole 30b provided in the center of the lightning arresting element 30a, an element holding fitting 31 joined to the lower part of the lightning arrester element 29, and an element holding fitting 30 provided on the outer periphery of the earth arresting element 29 and both element holding fittings 30, 31. Ta
The cover 32 is made of EPDM rubber. The coating 32 extends to the end surfaces of both the upper and lower element holding fittings 30 and 31.

As shown in FIG. 7, a metallicon 33 is applied to the upper and lower surfaces of each lightning arrester element 29, and a conductive spacer 34 made of a thin plate of soft metal (lead in this embodiment) is interposed between each element 29. The electrical connection between each lightning arrester element 29 is improved. In addition, each lightning protection element 2
An insulating layer 35 is formed on the outer peripheral surface of the conductive spacer 9, and an annular groove 36 formed by the insulating layer 35 and the conductive spacer 34 prevents the arc from flying.

The coating 32 prevents deterioration of the lightning arrester element 29 due to moisture absorption, displacement due to vibration, etc., and prevents rubber from entering between the lightning arrester elements 29 during molding of the rubber mold 42 described later, and furthermore, the element assembly 28 is made more compact. Therefore, the insulator 20 can be made smaller. Note that this coating 32 has a diameter of 1 to 4 so as to fit inside the annular groove 36 shown in FIG.
It is formed to a thickness of mm. By adhering the coating 32 and the lightning arrester element 29, the generation of voids can be more completely prevented, and the element holding function can be improved.

A conductive spacer 3 is also provided between the lightning arrester element 29 and the upper element holding fitting 30 and the lower element holding fitting 31.
4 is interposed.

A female screw 2 is provided on the lower inner peripheral surface of the ground side electrode 22.
2e is formed, and as shown in FIG. 3, a fastening fitting 25 having a male thread 25a on the outer circumferential surface is screwed together. A terminal fitting 37 is fixed through the insertion hole 25b at the center of the tightening fitting 25 via a cylindrical insulating spacer 38, and an element holding fitting 30 on the upper part of the element assembly 28
The element assembly 28 is crimped and fixed between the terminal fitting 37 and the voltage-supplying electrode 23, and a spring 39 that applies contact pressure to the lightning arrester element 29 has its upper end connected to the terminal fitting 37. It is interposed in the housing recess 37a with its lower end portion accommodated in the housing recess 30a of the element holding fitting 30. Note that shunts 40 are interposed in the spring 39 at one or more locations (three locations in this embodiment) to improve electrical connection.

Further, a buffer member 41 is screwed onto the lower surface of the terminal fitting 37 to soften the impact force on the shunt 40 when mold rubber is injected, which will be described later.

The lower element holding fitting 31 is formed with a protrusion 31a whose position is regulated by an uneven relationship with the engagement tube 23b of the energizing side electrode 23, and the protrusion 31a has a width that becomes narrower toward the lower end. A tapered surface 31b is provided to facilitate insertion into the engagement tube 23b and to maintain electrical contact.

A rubber mold 42 made of heat-shrinkable EPDM rubber is formed between the voltage-resistant insulation cylinder 21 and the element assembly 28, between the ground side electrode 22 and the terminal fitting 37, and on the outside of the voltage-resistant insulation cylinder 21. It extends to the lower outer circumferential surface of the ground side electrode 22 and the upper outer circumferential surface of the energized side electrode 23, and a pleat 42a is integrally formed on the outer circumference. This rubber mold 42 is 150
150Kg/cm ² of EPDM rubber in a fluid state at around ℃
It is injected and molded under moderate pressure. an annular groove 22f on the inner side of the upper part and the outer side of the lower part of the ground side electrode 22;
The annular groove 23d on the outside of the power-supplying electrode 23, the annular groove 37b on the outer periphery of the terminal fitting 37, the inside and outside of the voltage-resistant insulating cylinder 21, and the outside of the coating 32 of the element assembly 28 are
Vulcanized adhesive is pre-applied to bond the EPDM rubber and metal under the conditions of EPDM rubber injection and improve airtightness. In addition, the charging side electrode 2
The rubber mold 42 between the ground electrode 22 and the element assembly 28 is formed by discharging gas from the through hole 23c so that the rubber is spread throughout. , is formed by rubber that flows in through the through hole 25c formed in the fastening fitting 25 during molding.

Further, as shown in FIG. 5, the rubber mold 42 is provided with a pressure release port 42b at a position corresponding to the gas release hole 21b of the pressure-resistant insulating cylinder 21.
In addition, the discharge insulator 20 has the same pressure release port 42b connected to the electric wire 17.
It is attached to the connecting yoke 6 so as to be perpendicular to the connecting yoke 6 to prevent the hanging insulator 7 from being burnt out due to arc discharge in the event of an abnormality.

As shown in FIG. 1, an arcing ring arm 43 is fixed to one side of the bracket 18, and an arcing ring 44 is provided at the tip of the arcing ring arm 43 so as to correspond to the pressure relief port 42b in the upper part. It is being On the other hand, an arcing ring arm portion 43 is also attached to the horn mounting bracket 26 of the power-supplying side electrode 23.
is fixed with a bolt, and an arcing ring 44 is provided at the tip of the arcing ring arm portion 43 so as to substantially correspond to the lower pressure release port 42b.

Next, a method for manufacturing a lightning arrester according to the second invention will be explained.

First, the ground side electrode 22 and the energized side electrode 23 are fitted and fixed to the upper and lower ends of the voltage-resistant insulating cylinder 21, respectively, using a resin adhesive 24. Next, the voltage-resistant insulation cylinder 2
1. Apply vulcanized adhesive to the inside and outside of the grounding side electrode 22 and the energizing side electrode 23 and the outside of the coating 32 of the element assembly 28, and apply it to the element holding fitting 30 on the upper part of the element assembly 28 that has been formed in advance. An operating rod (not shown) provided with a male thread is screwed into the formed screw hole 30b, and the element assembly 28 is connected from the ground side electrode 22 to the voltage-resistant insulating cylinder 21.
The protrusion 31a of the element presser metal fitting 31 housed within the assembly 28 and provided at the lower part of the assembly 28 is engaged with the engagement cylinder 23b of the energizing side electrode 23 due to the uneven relationship, and the element assembly 28 is assembled.
After regulating the position, the operating rod is removed.

Next, the spring 39 with the shunt 40 interposed therein is accommodated in the accommodation recess 30a of the element holding fitting 30 on the upper part of the element assembly 28, and the upper end of the spring 39 is inserted into the terminal fitting 37.
The insulating spacer 38 is fitted into the terminal fitting 37, and the fastening fitting 25 is fitted into the insulating spacer 38. Thereafter, the terminal fitting 37 is pressed against the biasing force of the spring 39 using a jig (not shown), and the tightening fitting 25 is screwed onto the female screw 22e of the grounding electrode 22 and attached to the insulating spacer 38. to press. Then, the pressing by the jig is released, and the fixing of the element assembly 28 is completed.

Next, the voltage-resistant insulating cylinder 21 with the grounding side electrode 22 and the voltage-bearing side electrode 23 fitted and fixed is housed in a mold (not shown), and rubber is injected to create a voltage-resistant insulating cylinder 21 between the element assembly 28 and the voltage-resistant insulating cylinder 21. A rubber mold 4 is placed around the outer periphery of the insulating tube 21, the ground side electrode 22, and the energized side electrode 23.
2 is formed, and the manufacturing of the lightning arrester 20 is completed.

Next, the operation of the insulator device constructed as described above will be explained.

Now, when a lightning surge enters the electric wire 17 due to a lightning strike, the current is arc-discharged from the electric wire 17 to the clamp 16 → second connecting link 14 → connecting yoke 12 and discharge electrode 12a to the discharge electrode 27 via the air discharge gap G. , flows from the energizing side electrode 23 to the lightning arrester element 29 via the lower element holding fitting 31, and further flows from the upper element holding fitting 30→shunt 40→terminal fitting 37.
→Flows from the steel tower 1 to the ground via the connecting yoke 6. The subsequent current caused by this is blocked by the lightning arrester element 29.

In addition, lightning arrester 2 was damaged due to an unexpected large-scale lightning strike.
9 is abnormally discharged and a high-temperature, high-pressure arc occurs, a part of the coating 32 and a part of the rubber mold 42 near the gas escape hole 21b of the pressure-resistant insulating cylinder 21 are softened or melted and destroyed, and the high-pressure gas causes The arc is scattered and an arc discharge path leading to the outside is forcibly formed. The arc emitted to the outside of the insulator 20 is transferred between both arcing rings 44, and the upper and lower arcs are connected to each other.

Now, in the embodiment of the present invention, an engaging cylinder 23b is formed on the energizing side electrode 23 to restrict its position by an uneven relationship with the element holding fitting 31 at the lower part of the element assembly 28, and a female thread is formed on the grounding side electrode 22. A spring 39 for crimping and fixing the element assembly 28 between the energizing side electrode 23 and the terminal fitting 37 and a terminal fitting 3 for receiving the spring 39 are screwed into the clamping fitting 25 to 22e.
7, the tightening fitting 25 and the upper element holding fitting 30
Since it is interposed between them, the number of parts can be reduced compared to conventional lightning arrester insulators, and manufacturing costs can be reduced.

In addition, even if external bending or tensile forces are applied due to loading during construction, earthquakes, or vibrations of electric wires, all of these forces can be borne by the voltage-resistant insulating cylinder 21 and the rubber mold 42, so that they will not affect the sheathing 32 or the element part. Therefore, cracks and damage to the sheathing 32 and the lightning arrester element 29 can be prevented, and damage to the lightning arrester 20 can be prevented. Furthermore, even if an arc occurs in the element portion, the pressure-resistant insulating tube 21 can absorb the arc, thereby preventing scattering and destruction.

In addition, in this embodiment, the lightning arrester 29 is connected to the terminal fitting 3.
7. Since the lightning arrester elements 29 are enclosed in the cover 32 together with the element holding fittings 30 and 31 at both the upper and lower ends, the lightning arrester elements 29 can be stacked and fixed in a compact manner, and the storage space thereof can be reduced to downsize the lightning arrester 20 and improve workability. .

Furthermore, since the lightning protection element 29 is tightly wrapped with the covering 32 and the rubber mold 42, it is possible to prevent the lightning protection element 29 from shifting due to vibrations, etc., and to prevent moisture absorption and deterioration of the lightning protection element 29.

In addition, since the lightning arrester element 29 is built in by the voltage-resistant insulating tube 21 made of FRP and the rubber mold 42,
Mechanical strength is improved, and the weight of the lightning arrester 20 can be significantly reduced.

Furthermore, in this embodiment, the thickness of the coating 32 is 1 to 1.
Since it is formed to have a diameter of 4 mm, it fits within the annular groove 36 and does not form a gap, thereby preventing deterioration of the lightning arrester element 29 due to corona discharge.

In addition, since the pressure-resistant insulating cylinder 21 is made of FRP that can withstand the temperature and pressure during rubber molding, reliability of mechanical strength can be ensured during the manufacturing process, and the ground side electrode 22 and the charged side electrode 23 This prevents the insulating cylinder 21 from falling off and deforming the voltage-resistant insulating cylinder 21.

Note that the present invention is not limited to the above embodiments, and may be implemented as follows.

(1) As shown in FIG. 9, for the energizing side electrode 23,
Three arc-shaped protrusions 23e are formed at equal intervals on the same circumference, and the protrusions 31a of the element holding fitting 31 are engaged between the protrusions 23e.
Also, two or four or more of the same protrusions 23e may be provided.

(2) A recess is formed in the bottom of the energizing side electrode 23 to accommodate the protrusion 31a of the element holding fitting 31.

(3) A protrusion is formed in the center of the energizing side electrode 23, and a recess is formed in the element holding fitting 31, so that the protrusion and the recess are engaged.

(4) As shown in FIG. 10, a self-fusing tape 45 is wound around the outer periphery of the lightning arrester 29, the upper element holding fitting 30, and the lower element holding fitting (not shown) to form the element assembly 28. .

(5) Apply a rubber type adhesive to the outer periphery of the lightning arrester element 29 and the element holding fitting 30 to form the element assembly 28.

(6) As shown in Figure 11, the upper element holding bracket 3
0 and the lower element holding bracket (not shown) are made of FRP.
The element assembly 28 is configured by connecting by a plurality of connecting plates 46 consisting of the following. In this case, the connecting plate 46 is fixed to the upper and lower element holding fittings by screws 47 or adhesive. Further, seals 48 are applied between each lightning arrester element 29 using a rubber type adhesive as shown in FIG.

(7) The conductive spacer 34 interposed between each lightning arrester element 29 in the above embodiment can be omitted.

(8) Change the rubber mold 42 to EPDM rubber,
Shall be made of silicone rubber or butyl rubber.

Effects of the Invention As detailed above, according to the present invention, compared to conventional lightning arrester insulators, the number of parts can be reduced and the structure can be simplified, the work process can be simplified, and manufacturing costs can be reduced.

In addition, even if external bending or tensile forces are applied due to loads during construction, earthquakes, or wire vibrations, all of these forces can be borne by the voltage-resistant insulating cylinder and rubber mold, so there is no effect on the covering or element parts. , cracks and damage to the coating and elements can be prevented, and damage to the lightning arrester can be prevented. Furthermore, even if an arc occurs in the element part, the pressure-resistant insulating cylinder takes on the burden and has the excellent effect of preventing scattering destruction.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an insulator device equipped with the lightning arrester of the present invention, FIG. 2 is a front view showing the lightning arrester, and FIGS. 3 and 4 are semi-vertical cross-sectional views showing the main parts.
Figure 5 is an end view taken along line A-A in Figure 3, and Figure 6 is the end view of Figure 4.
7 is a partial enlarged sectional view of the lightning arrester element, FIG. 8 is an end view taken along C-C line of FIG. 3, and FIG. 9 is a perspective view showing another example of the charging side electrode. 10 is a partial perspective view showing another example of the element assembly, FIG. 11 is a partial front view showing another example of the element assembly, FIG. 12 is an enlarged sectional view showing the connected state of the lightning arrester element, and FIG. FIG. 13 is a longitudinal sectional view showing a conventional lightning arrester. 21...Voltage insulating cylinder, 22... Ground side electrode, 2
2e...Female thread, 23...Electrifying side electrode, 25...
Tightening fitting, 29... Lightning arrester element, 30, 31... Element holding fitting, 32... Covering, 37... Terminal fitting,
39...Spring, 42...Rubber mold.

Claims (1)

[Claims] 1. A cylindrical ground side electrode 22 and a bottomed cylindrical energized side electrode 23 are fitted and fixed to the upper and lower ends of the voltage-resistant insulating cylinder 21, respectively, and a plurality of lightning arresters 29 are installed between the two electrodes. An element assembly 28 configured by stacking the elements in series is accommodated, and an element retainer 31 is positioned on the energizing side electrode 23 in an uneven relationship with an element retainer 31 provided at the lower end of the element assembly 28. An element holding metal fitting 3 is provided at the upper end of the element assembly 28, with a concave portion or a convex portion for regulating and connecting, and a tightening metal fitting 25 screwed onto a female thread 22e provided on the inner periphery of the ground side electrode 22.
A spring 39 for crimping the element assembly 28 is interposed between the energizing side electrode 23 and the terminal fitting 37, and a voltage-resistant insulator is provided between the element assembly 28 and the clamping fitting 25. A lightning arrester characterized in that a rubber mold 42 is provided between the cylinder 21 and on the outer periphery of the voltage-resistant insulating cylinder 21. 2 The power-supplying side electrode 23 is made of rubber with a pressure-resistant insulating tube 21
The lightning arrester according to claim 1, which is provided with a through hole 23c for passing through the lightning arrester. 3. The lightning arrester according to claim 1, wherein the energizing side electrode 23 is integrally provided with a horn mounting bracket 26 having a bolt insertion hole 26a for mounting a discharge electrode 27. 4 The ground side electrode 22 has a bolt insertion hole 22
The lightning arrester according to claim 1, which is integrally provided with a mounting flange 22c having a diameter d. 5 After fitting and fixing the cylindrical ground side electrode 22 and the bottomed cylindrical energized side electrode 23 to the upper and lower ends of the voltage-resistant insulating tube 21, respectively, an element assembly is constructed by stacking a plurality of lightning arrester elements 29 in series. The body 28 is housed in the voltage-resistant insulating cylinder 21 from the grounding side electrode 22 using an operation rod, and the element holding fitting 31 provided at the lower part of the assembly 28 is inserted into the concave or convex portion provided on the power-supplying side electrode 23 due to the unevenness. element holding fitting 3 on the upper part of the element assembly 28.
Insert the spring 39 and the terminal fitting 37 for receiving the spring 39 into the upper part of the spring 39, and attach the tightening fitting 25 to the female screw 22e provided on the ground side electrode 22.
5 are screwed together and the terminal fitting 37 is pushed in against the biasing force of the spring 39 to fix the element assembly 28 between the energizing side electrode 23 and the terminal fitting 37, and then housed in a mold. A method for manufacturing a lightning arrester, characterized in that a rubber mold 42 is provided between the element assembly 28 and the voltage-resistant insulating cylinder 21 and around the outer periphery of the voltage-resistant insulating cylinder 21.