JPS61284901A - Stationary connection of lightning arrestor element - 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 Object of the Invention (Field of Industrial Application) The present invention mainly relates to a method for fixedly connecting a plurality of lightning arrester elements used in a lightning arrester insulator.

(Prior Art) Conventionally, lightning arrester insulators have been proposed in which a plurality of cylindrical lightning arrester elements are built in series in a resin mold. In this lightning arrester, in order to prevent deterioration of the lightning arrester element due to moisture absorption and to prevent the resin mold from entering between the lightning arrester elements, the outer periphery of the lightning arrester element is covered with a heat shrinkable tube to fixedly connect the lightning arrester element. (Patent Publication No. 57-48588) (Problems to be Solved by the Invention) However, since the lightning arrester element is a fired product, it is difficult to obtain a product with a uniform perfect circular shape. For this reason, in the conventional fixed connection method of lightning arrester elements, the heat-shrinkable tube cannot fit closely along the shape of the element, and a gap is partially created between the step part of adjacent lightning arrester elements and the inner periphery of the heat-shrinkable tube. arise. As a result, corona discharge occurs, accelerating the deterioration of the lightning arrester, and when the volume of the void repeats due to expansion and contraction due to heat,
There was a problem in that moisture entered the void, causing the lightning arrester to absorb moisture and deteriorate.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for fixing and connecting lightning arrester elements that solves the above-mentioned problems.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention stacks a plurality of lightning arrester elements in series and then wraps a self-fusing tape around the outer peripheral surface of the elements. A structure is adopted in which the elements are fixedly connected in one piece.

(Function) Since the present invention employs the above-mentioned means, the self-fusing tape is pressed against the surface of the lightning arrester element along the shape of the element, and is in a close contact state, creating a gap between the lightning arrester element and the self-fusing tape. The tape not only disappears, but also extends into the gaps between the elements, and the lightning arrester elements are fixedly connected as one piece.

(Example) Hereinafter, a lightning arrester unit 1 fixedly connected according to the present invention will be described with reference to FIGS. 1 and 2. As shown in Fig. 2, metallic silicon 3
A plurality of the same elements 2 are stacked in series. A conductive spacer 4 made of a thin plate of soft metal (lead (Pb) in this embodiment) is interposed between each element 2 to improve electrical connection.

Further, an insulating layer 5 is formed on the outer peripheral surface of each lightning arrester element 2 to prevent arcs from flying between the outer peripheral edges of adjacent conductive spacers 4.

Element holding fittings 6 are joined to both upper and lower ends of the lightning arrester element 2 via conductive spacers 4.

In the laminated state shown in FIG. 1, a self-fusing tape 7 that is fused at room temperature to about 90°C is wound around the outer peripheral surfaces of the element holding fittings 6, 6 and the lightning arrester element 2, and the lightning arresting element 2 is attached to the element holding fitting 6. They are fixedly connected together. In this embodiment, Fcotave (trade name, manufactured by Furukawa Electric Co., Ltd.), which is mainly composed of EP rubber, is used as the self-fusing tape 7.

To wind this self-fusing tape 7, it is pulled so that the tape width is 2, and the tape is wound spirally in each layer. Since the self-fusing tape 7 is soft, the tape 7 is inserted into the annular groove 8 formed by the insulating layer 5 and the conductive spacer 4.
Part of it enters and no void is created. Further, the adhesion between the self-fusing tape 7 and the lightning arrester element 2 and the pressure during winding improve the adhesion, and the lightning arrester unit 1 can be handled as is. The thickness of the self-fusing tape 7 should be 1 to 100% from the viewpoint of the rigidity of the element laminate, the fusing properties of the self-fusing tape 7, and other aspects.
7 mm is desirable, and if the winding thickness is to be increased, it may be wound in several layers.

Now, in this embodiment, since the plurality of lightning arrester elements 2 and the element presser metal fittings 6,6 at both ends of the lightning arrester elements 2 are fixedly connected using the self-fusing tape 7, the self-fusing tape 7 follows the shape of the lightning arrester element 2. It is pressed onto the surface of the lightning protection element 2, and a part of the self-fusing tape 7 enters into the ring-shaped groove 8 to prevent the formation of voids, thereby preventing the lightning protection element 2 from absorbing moisture and corona discharge. can prevent deterioration.

Also, due to the adhesiveness between the self-fusing tape 7 and the lightning arrester element 2,
Since the element holding fitting 6.6 and the lightning arrester element 2 are integrally fixedly connected, it is possible to prevent the position of the lightning arrester element 2 from shifting due to vibrations, etc., and it can be handled as is as a lightning arrester unit 1, making it easy to transport, transport, and protect the lightning arrester. It can improve work efficiency in manufacturing etc.

Note that the conductive spacer 4 may be formed of a soft metal such as aluminum or copper instead of lead.

Next, an example of a lightning arrester incorporating the above-mentioned lightning arrester unit 1 will be explained with reference to FIGS. Ready to be installed.

As shown in Figure 4.5, reinforced plastic (FRP) has excellent mechanical strength, heat resistance, and pressure resistance.
A stepped portion 14 is provided at the upper end of the voltage-resistant insulating cylinder 13 made of materials such as
A cylindrical ground side electrode 14 with a stepped portion 15 at the lower end.
Cylindrical power-supply-side mounting fittings 15 having a diameter a are respectively fitted and fixed with an adhesive 16. Note that an annular groove 13a is formed on the outer circumferential surface of both ends of the voltage-resistant insulating tube 13, and annular grooves 14b and 15b are also formed on the inner circumferential surfaces of the ground side electrode 14 and the power-supplying side mounting bracket 15 to increase the bonding area. This strengthens the adhesion. The support fitting 12 is fitted onto the upper outer periphery of the ground side electrode 14 . Furthermore, gas escape holes 13b are formed in the upper, center, and lower parts of the voltage-resistant insulating tube 13 at intervals of 180° in the diametrical direction of the insulating tube 13, as shown in FIG. The gas escape hole 13b is connected to the ground side electrode 1.
4 and the energizing side mounting bracket 15, and the intermediate portion thereof, the arc jet emission efficiency is good.

A female thread 15c is provided on the lower inner circumferential surface of the power supply side mounting bracket 15.
is formed, and a male thread 17a is formed on the outer peripheral surface as shown in FIG.
After screwing together the fastening fitting 17 having
A stop ring 18 fitted at the bottom prevents loosening. A female thread 17b is formed on the inner peripheral surface of the fastening metal fitting 17, and a metal fitting 19 is screwed into the spring receiver having a male thread 19a.

In addition, a male screw 1 is provided on the outer surface of the lower part of the power supply side mounting bracket 15.
5d is formed, and a bottomed cylindrical energizing side electrode 20 having a female thread 20a is screwed and fixed thereto.

A ring-shaped protrusion 20b is protruded near the center of the bottom of the energizing side electrode 20, and the spring receiver has a plurality of disc springs 21 between it and the metal fitting 19 to prevent the energizing side electrode 20 from loosening. is mediated. Further, a discharge electrode 22 is screwed and fixed to the lower surface of this energizing side electrode 20.

The lightning arrester unit 1 is housed in the voltage-resistant insulating cylinder 13, and a cylindrical insulating spacer 24 is provided in the element holding bracket 6 on the upper part of the unit 1 and in the insertion hole 14c inside the ground side electrode 14 shown in FIG. A plurality of disc springs 25 for applying a contact pressure to each lightning arrester element 2 and a conductive spacer 2 for adjusting the contact pressure are provided between the leakage current extraction terminal 23 and the leakage current extraction terminal 23 fixed through the lightning arrester element 2.
6 is interposed. Incidentally, conductive members 27 having a U-shaped cross section are interposed at three locations in the disc spring 25 to improve electrical connection.

Further, a disc spring 25, a conductive spacer 26, and a conductive member 27 similar to those described above are disposed between the element holding fitting 6 at the bottom of the lightning arrester unit 1 and the spring holding fitting 28 engaged with the upper surface of the tightening fitting 17. It is mediated. In this way, the lightning arrester unit 1 is electrically connected between the leakage current extraction terminal 23 and the energized side electrode 20, and is kept energized.

A rubber mold 29 made of EPDM rubber is formed between the voltage-resistant insulating tube 13 and the lightning arrester unit 1, between the ground side electrode 14 and the leakage current extraction terminal 23, and on the outside of the voltage-resistant insulating tube 13. 14 and the upper outer circumferential surface of the power-supplying electrode 20, and a pleat 29a is integrally formed on the outer circumference. This rubber mold 29
is EPDM rubber in a fluid state at about 150°C.
It is molded by injection at a pressure of about 0 kg/cnl.

At this time, the self-fusing tape 7 prevents rubber from entering between the contact surfaces between the lightning arrester element 2 and the conductive spacer 4.

Annular grooves 1 on the inner side of the upper part and the outer side of the lower part of the ground side electrode 14
4d, the annular groove 20C on the outer periphery of the power-supplying electrode 20 and the annular groove 23b on the outer periphery of the collapsible current extraction terminal 23 are provided with a groove for adhering the EPDM rubber and metal under the conditions at the time of injection of the EPDM rubber to improve airtightness. Vulcanized adhesive is pre-applied. In addition, the ground side electrode 14 and the leakage current extraction terminal 23
The rubber mold 29 between the ground electrode 14 and
It is formed by rubber flowing in from the inner through hole 14e.

Furthermore, as shown in FIG. 6, the rubber mold 29 is provided with a pressure release port 29b at a position corresponding to the gas release hole 13b of the pressure-resistant insulating cylinder 13.

A mounting piece 12 a provided on one side of the support fitting 12 and a mounting fitting 32 fixed to the lower outer periphery of the energizing side electrode 20
The mounting pieces 32a each include an arcing ring arm 3.
0 is fixed with a bolt, and the arcing ring arm 3
An arcing ring 31 is provided at the tip of 0 so as to substantially correspond to the pressure relief port 29b.

Next, the operation of the lightning arrester 11 constructed as described above will be explained.

Now, when a lightning surge enters the electric wire due to a lightning strike and the current is arc-discharged to the discharge electrode 22 through the air discharge gap, the current is transferred from the power-supply side electrode 20 to the power-supply side mounting bracket 15 - clamping bracket 17 -
Spring holding fitting 28-conductive spacer 26-conductive member 27-
It flows through the lower element holding fitting 6 to the lightning arrester element 2, and then the upper element holding fitting 6 - conductive member 27 - conductive spacer 2
6- Leakage current flows from the tower to the ground via the extraction terminal 23. The subsequent current caused by this is blocked by the lightning arrester unit 1.

In addition, if the lightning arrester 2 is abnormally discharged due to an unexpected large-scale lightning strike and a high-temperature, high-pressure arc is generated, the voltage-resistant insulating tube 1
A part of the self-fusing tape 7 and a part of the rubber mold 29 near the gas escape hole 13b of No. 3 are softened or melted and destroyed,
The high-pressure gas scatters and forcibly forms an arc discharge path leading to the outside. The arc discharged to the outside of the lightning arrester 11 is connected to the upper and lower pressures and moves between the two arcing rings 31.

Effects of the Invention As described in detail above, according to the present invention, the self-fusing tape is pressed against the surface of the lightning arrester element along the shape of the element, and is in close contact with the surface of the lightning arrester element, thereby creating a gap between the lightning arrester element and the self-fusing tape. Not only does this prevent the occurrence of lightning, but the tape also extends into the gaps between the elements, allowing the lightning arrester elements to be fixedly connected as one piece. Therefore, it is possible to prevent deterioration of the lightning arrester element due to moisture absorption and corona discharge, prevent displacement of the lightning arrester element due to vibration, etc., and furthermore prevent rubber from entering between the contact surfaces of the lightning arrester element during rubber molding. .

Furthermore, the lightning arrester element can be handled in a fixedly connected state, and work efficiency can be improved in transportation, manufacturing of lightning arrester insulators, etc.

Furthermore, the winding thickness of the self-fusing tape can be adjusted by winding it in multiple layers, which has an excellent effect.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing the method of fixing and connecting the lightning arrester, Figure 2 is a partial enlarged sectional view of the lightning arrester, Figure 3 is a front view of the lightning arrester, and Figures 4 and 5 are half views showing the main parts. 6 is a reduced end view taken along the line A-A in FIG. 4, FIG. 7 is a reduced end view taken along the line B-B in FIG. 5, and FIG. 8 is a reduced end view taken along the line C-C in FIG. 4. It is a diagram. 1... Lightning arrester element unit, 2... Lightning arrester element, 6...
・Element holding fitting, 7... Self-fusing tape, 11...
Lightning arrester, 13... Voltage insulating cylinder, 14... Ground side electrode, 20... Power supply side electrode, 29... Rubber mold. Patent applicant Agent: Nippon Insulator Co., Ltd.
Person Patent Attorney On 1) Hironobu Figure 1 Figure 2

Claims (1)

[Claims] 1. After stacking a plurality of lightning arrester elements (2) in series, a self-fusing tape (7) is wound around the outer peripheral surface of the lightning arrester elements (2) to integrate all the elements (2) into one piece. A fixed connection method for lightning arrester elements, characterized by fixed connection. 2. The method for fixing and connecting lightning arrester elements according to claim 1, wherein the self-fusing tape (7) has a winding thickness of 1 to 7 mm. 3. The method for fixing and connecting lightning arrester elements according to claim 1, wherein the self-fusing tape (7) is made of EP rubber. 4 The lightning arrester elements (2) at both ends are attached to element holding fittings (6
) A method for fixedly connecting a lightning arrester element according to claim 1.