JPH0586608B2 - - Google Patents

Description

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

(Conventional technology) Conventionally, the 9th lightning arrester insulator with a built-in lightning arrester was used.
What is proposed is shown in the figure. To explain this lightning arrester, it is hollow and has 5 folds on the outside.
Flange fittings 52 and 53 are fitted to the upper and lower ends of the porcelain insulator 51 having the shape 1a, respectively, and are fixed by cementing 54. Terminal plates 57 and 58 having rupture discs 59 and 60 are fixed to the end faces of both flange fittings 52 and 53 through packings 55 and 56 between them and the porcelain insulator tube 51.

An element assembly 63 is inserted and fixed within the porcelain insulator tube 51. This element assembly 63 is made by stacking a plurality of lightning arrester elements 64 in series, inserting a plurality of insulating rods 66 near the outer periphery of a support plate 65 joined to both the upper and lower ends, and tightening them with nuts 67 to be integrally clamped and fixed. There is.

(Problems to be Solved by the Invention) However, in the conventional lightning arrester, moisture passes through the cementing 54 or the joint surface between the flange fitting 53 and the terminal plate 58, and further passes through the material of the packing 56, causing the porcelain. It is easy to invade into the insulator pipe 51,
In addition, the rupture discs 59 and 60 are susceptible to fatigue failure due to atmospheric thermal changes, which causes the lightning arrester element 64 to deteriorate due to moisture absorption, resulting in poor airtightness. Another problem is that the overall length increases depending on the length of the metal fittings such as the flange metal fittings 52 and 53 and the pressure relief path forming cover 61.

Furthermore, since the lightning arrester has an insulating rod 66 arranged around the outer periphery of the lightning arrester element 64 and uses the rod 66 to fix the lightning arrester element 64, a large storage space is required, and the wall thickness of the porcelain insulator tube 51 is limited. Due to the large size, the lightning arrester becomes larger in the lateral direction, and the lightning arrester element 64 is likely to be displaced in the lateral direction due to vibration or the like. Furthermore, since they are connected using bolts, vibrations can cause the bolts to loosen and cause the lightning arrester to fall off.

The 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 of the present invention, annular grooves are provided on the outside of both the upper and lower ends of the voltage-resistant insulating tube, and the ground side electrode and the charged side electrode are connected to the It is fitted and adhesively fixed to the outside of both the upper and lower ends of the voltage-resistant insulating cylinder, and an annular groove is provided on the outside of the grounding side electrode and the power supplying side electrode.
and a plurality of lightning arrester elements are stacked and interposed in series between both electrodes, and the energized side electrode has a bottomed cylindrical shape,
A rubber mold is provided between the lightning arrester element and the voltage-resistant insulating cylinder and on the outer periphery of the voltage-resistant insulating cylinder, and one end of the rubber mold is extended to the outer peripheral surface of the grounding side electrode and the energizing side electrode. There is.

(Function) The present invention improves airtightness by the rubber mold extending on the outer peripheral surface of the ground side electrode and the energized side electrode.
Moisture absorption deterioration of the lightning arrester element is prevented. In addition, the creepage insulation distance of the lightning arrester is increased by the length of the rubber mold extending on the outer peripheral surface of both electrodes, improving the insulation performance. is downsized.

Furthermore, the lightning arrester elements are laminated and fixed by rubber molding, reducing the storage space and making the lightning arrester more compact. It also prevents the lightning arrester from shifting due to vibrations, etc. Since an annular groove is provided in the rubber mold, the adhesive surface with the rubber mold is widened, and the rubber mold will not come off due to vibration shock or the like.

(Example) Examples 1 to 8 which embody the present invention will be described below.
This will be explained according to the diagram. As shown in Figure 1, the steel tower 1
A hanging fitting 2 is tightened and fixed with a bolt 3,
A hanging fitting 4 is supported on the hanging fitting 2 so as to be orthogonal to the hanging fitting 2. A connecting yoke 6 is supported on the hanging fitting 4 via a connecting pin 5. Suspension insulators 7, 7 are rotatably supported at both left and right ends via connecting pins 8, respectively.

First connecting links 10, 10 are supported at the lower ends of both suspension 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 discharge electrode 12a is provided at the center of the upper surface of the connection yoke 12.
is provided.

Further, a lightning arrester 19 is attached to the connecting yoke 6 via a bracket 18 and a support fitting 20.

Next, to explain the lightning arrester 19 in detail, as shown in FIGS. 3 and 4, a voltage-resistant insulating tube 21 made of a material such as reinforced plastic (FRP) with excellent mechanical strength has a stepped portion 22a at the upper end. A cylindrical ground-side electrode 22 and a cylindrical power-supply-side mounting bracket 23 having a stepped portion 23 a at the lower end are respectively fitted and 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 cylinder 21, and the grounding side electrode 22 and the power-supplying side mounting bracket 23
Annular grooves 22b and 23b are also formed on the inner peripheral surface of the
The adhesive area is increased to strengthen the adhesive. The support fitting 20 is fitted onto the upper outer periphery of the ground side electrode 22 . In addition, gas escape holes 21b are provided in the upper, center, and lower parts of the voltage-resistant insulating tube 21 at intervals of 180° in the diametrical direction of the insulating tube 21, as shown in FIG.
is formed. It is efficient to provide the gas escape hole 21b near the ground side electrode 22 and the power supply side mounting bracket 23 and near the intermediate part thereof.

A female thread 23c is formed on the inner peripheral surface of the lower part of the power-supplying side mounting bracket 23, and as shown in FIG. The matching stop spring 26 prevents loosening. A female thread 25b is formed on the inner circumferential surface of the fastening metal fitting 25, and a spring receiving metal fitting 27 having a male thread 27a is screwed into the female thread 25b.

Further, a male thread 23d is formed on the lower outer peripheral surface of the power supply side mounting bracket 23, and a bottomed cylindrical power supply side electrode 28 having a female thread 28a is screwed and fixed thereto. An annular protrusion 28b is protruded from the center of the bottom of the energizing side electrode 28, and a plurality of disc springs 29 for preventing loosening of the energizing side electrode 28 are provided between the spring receiving fitting 27 and the spring receiving metal fitting 27. It is mediated. Further, a discharge electrode 30 is screwed and fixed to the lower surface of the energized side electrode 28, and an air discharge gap G is formed between it and the discharge electrode 12a of the connection yoke 12.

Inside the voltage-resistant insulating tube 21 is a lightning arrester element 3 made of a material whose voltage and current characteristics are non-linear, mainly consisting of zinc oxide.
1 are stacked in series. As shown in FIG. 7, a metallicon 32 is applied to both the upper and lower surfaces of each lightning arrester element 31, and a conductive spacer 33 made of a thin plate of soft metal (lead (Pb) in this embodiment) is provided between each element 31. The lightning arrester elements 31 are interposed to improve electrical connection between each lightning arrester element 31. Further, an insulating layer 34 is formed on the outer peripheral surface of each lightning arrester element 31 to prevent arcs from flying between the outer peripheral edges of the conductive spacer 33.

An element holding fitting 35 is disposed at the upper end of the lightning arrester element 31 via a conductive spacer 33, and is fixed through the insertion hole 22c inside the ground side electrode 22 via a cylindrical insulating spacer 37, as shown in FIG. The lightning arrester element 31 is connected to the leakage current extraction terminal 36.
A plurality of disc springs 38 and conductive spacers 39 for adjusting the contact pressure are interposed. Note that the disc spring 38 has three conductive members 40 each having a cross-section shape.
It is interposed at a certain point to improve the electrical connection.

Also, a conductive spacer 33 is provided at the lower end of the lightning arrester element 31.
An element holding fitting 35 is disposed through the spring holding fitting 41 engaged with the upper surface of the tightening fitting 25, and a disc spring 38 and a conductive spacer 39 similar to those described above are interposed between the spring holding fitting 41 and the spring holding fitting 41 engaged with the upper surface of the tightening fitting 25. A conductive member 40 similar to that described above is interposed. In this way,
The lightning arrester 31 is electrically connected between the leakage current extraction terminal 36 and the energized side electrode 28, and
Force is maintained.

The insulating spacer 37 and the leakage current extraction terminal 3
The outer peripheral surfaces of the locking portions 36a of 6, the conductive spacers 39, 39, the spring holding fittings 41, the element holding fittings 35, 35, and the lightning arrester element 31 are covered with a heat-shrinkable tube 42 made of EPDM rubber and having a rigidity retaining function. , the lightning arrester element 31 is integrally contained and fixed together with the leakage current extraction terminal 36 and the spring holding fitting 41. This heat-shrinkable tube 42 protects the lightning protection element 3.
1, deterioration due to moisture absorption, positional shift due to vibration, etc., and lightning arrester element 3 during formation of rubber mold 44, which will be described later.
Rubber is prevented from entering the space between the lightning arrester 19 and the lightning arrester element 31 is made more compact, making it possible to downsize the lightning arrester 19. The heat-shrinkable tube 42 is formed to have a thickness of 1 to 4 mm so as to fit into the circular annular groove 43 formed by the insulating layer 34 and the conductive spacer 33 shown in FIG. 7 so as not to form a gap. has been done. In addition, the heat shrink tube 42 and the lightning arrester element 3
By adhering 1 to 1, it is possible to more completely prevent the generation of voids and improve the element holding function.

Heat-shrinkable material is provided between the voltage-resistant insulating tube 21 and the lightning arrester element 31, between the grounding side electrode 22 and the leakage current extraction terminal 36, and on the outside of the voltage-resistant insulating tube 21.
A rubber mold 44 made of EPDM rubber is formed and extends to the lower outer circumferential surface of the ground side electrode 22 and the upper outer circumferential surface of the energized side electrode 28 to form the lightning arrester 19.
The creepage insulation distance is increased, and there are four folds on the outer periphery.
4a are integrally formed. This rubber mold 44 contains EPDM rubber in a fluid state of about 150°.
It is molded by injection at a pressure of ^about 150Kg/cm2. The annular grooves 22d on the inside of the upper part and the outside of the lower part of the ground side electrode 22, the annular groove 28c on the outside of the power-supplying electrode 28, and the annular groove 36b on the outer periphery of the leakage current extraction terminal 36 are filled with EPDM rubber under the conditions at the time of EPDM rubber injection. The annular groove 22d,
28c widens the adhesive surface to prevent separation. The rubber mold 44 between the ground electrode 22 and the leakage current extraction terminal 36 is formed of rubber that flows into the through hole 22e inside the ground electrode 22 during molding.

Furthermore, as shown in FIG.
A pressure relief port 44b is provided at a position corresponding to . The lightning arrester 19 is attached to the connection yoke 6 so that the pressure relief port 44b is perpendicular to the electric wire 17, and the suspension insulator 7 is
to prevent it from burning out.

A mounting piece 2 provided on one side of the support fitting 20
An arcing ring arm 45 is fixed to Oa with a bolt, and an arcing ring 46 is provided at the tip of the arcing ring arm 45 so as to correspond to the pressure release port 44b in the upper part. On the other hand, a mounting bracket 47 is fixed to the lower outer periphery of the energizing side electrode 28, and an arcing ring arm 45 is also fixed to the mounting piece 47a with a bolt. Pressure relief port 4
Arcing ring 46 almost corresponds to 4b.
is provided.

Next, the operation of the suspended 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 flows from the electric wire 17 to the clamp 16 → the second connecting link 14 → the discharge electrode 12a of the connecting yoke 12.
An arc is discharged from the energizing side electrode 28 to the energizing side mounting bracket 23 → the clamping bracket 25 → the spring holding bracket 41 → the conductive spacer 39 → the conductive member 40 → the lower part. The flow passes through the element holding fitting 35 to the lightning protection element 31, and then the upper element holding fitting 35→conductive member 40→conductive spacer 3
The leakage current flows from the steel tower 1 to the ground via the leakage current extraction terminal 36 and the connection yoke 6. The subsequent current caused by this is blocked by the lightning arrester element 31.

In addition, lightning arrester 3 was damaged due to an unexpected large-scale lightning strike.
1 abnormally discharges and a high-temperature, high-pressure arc occurs, a part of the heat-shrinkable tube 42 and the rubber mold 44 near the gas escape hole 21b of the pressure-resistant insulating cylinder 21
A part of the arc is softened or melted and destroyed, and is blown away by the high-pressure gas, forcibly forming an arc discharge path leading to the outside. The arc emitted to the outside of the insulator 19 connects with the upper and lower sides and moves between the two arcing rings 46.

Now, in the embodiment of the present invention, the airtightness of the lightning arrester 19 can be improved by the rubber mold 44 extending to the outer peripheral surfaces of the ground side electrode 22 and the energized side electrode 28.
It is possible to prevent moisture from entering the voltage-resistant insulating cylinder 21 and prevent the lightning arrester element 31 from deteriorating due to moisture absorption.

In addition, the creepage insulation distance of the lightning arrester 19 can be increased by the length of the rubber mold 44 extending to the outer peripheral surfaces of both electrodes 22 and 28, thereby improving the insulation properties, compared to conventional lightning arrester insulators having the same creepage insulation distance. Compared to this, the lightning arrester 19 can be made smaller.

Furthermore, the lightning protection element 31 is formed by the rubber mold 44.
can be stacked and fixed, the storage space thereof can be reduced, the lightning arrester 19 can be downsized, and the displacement of the lightning arrester element 31 due to vibration or the like can be prevented.

In addition, since the lightning arrester element 31 is built in by the voltage-resistant insulating tube 21 made of FRP and the rubber mold 44,
The lightning arrester 19 can be significantly weighed.

Since the adhesive surface is widened by the annular grooves 22d and 28c, the rubber mold 44 and the charging and grounding side electrode 2
8 and 22 is prevented.

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

(1) Instead of lead, the conductive spacer 33 may be a thin plate made of soft metal such as aluminum or copper.

(2) Change the heat shrink tube 42 to EPDM rubber,
It may be formed from polyethylene or fluororesin.

(3) Change the rubber mold 44 to EPDM rubber,
It may be made of silicone rubber or butyl rubber. Note that it is desirable that the molding material and the heat shrink tube 42 be made of the same material. In this way, the bondability between the heat-shrinkable tube 42 and the rubber mold 44 is improved.

Effects of the Invention As detailed above, according to the present invention, the airtightness of the lightning arrester can be improved by the rubber mold extending on the outer circumferential surface of the grounding side electrode and the energizing side electrode, and moisture can be prevented from entering the voltage-resistant insulating cylinder. It is possible to prevent intrusion and prevent deterioration of lightning protection elements due to moisture absorption. In addition, the creepage insulation distance can be increased by the length of the rubber mold extending on the outer circumferential surface of both electrodes, improving insulation, and since the lightning arrester elements can be stacked and fixed using the rubber mold, the storage space can be reduced. Therefore, the lightning arrester can be made smaller compared to a conventional lightning arrester having the same creepage insulation distance, and it is also possible to prevent displacement of the lightning arrester element due to vibration, etc., and separation of the electrification and ground side electrode from the rubber mold. It has excellent effects.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a suspension insulator device equipped with the lightning arrester of the present invention, Fig. 2 is a left side view showing the lightning arrester, Figs. The figure is a reduced end view taken along line A-A in Figure 3, and Figure 6.
The figure is a reduced end view taken along the line B-B in Fig. 4, Fig. 7 is a partially enlarged sectional view of the lightning arrester, and Fig. 8 is a C-C line in Fig. 3.
The line-reduced end view and FIG. 9 are longitudinal cross-sectional views showing a conventional lightning arrester. 21...Voltage insulating cylinder, 22... Ground side electrode, 2
8...Power-supplying side electrode, 31...Lightning arrester element, 42...
Heat shrink tube, 44...Rubber mold.

Claims (1)

[Claims] 1. An annular groove is provided on the outside of both the upper and lower ends of the voltage-resistant insulating cylinder, and a grounding side electrode and a voltage-carrying side electrode are respectively fitted and adhesively fixed to the outside of both the upper and lower ends of the voltage-resistant insulation cylinder, and the grounding side electrode and the voltage-carrying side electrode An annular groove is provided on the outside of the electrode, and a plurality of lightning arrester elements are stacked in series and interposed between both electrodes, and the energized side electrode has a bottomed cylindrical shape, and between the lightning arrester element and the voltage-resistant insulating tube. and a lightning arrester, characterized in that a rubber mold is provided on the outer periphery of the voltage-resistant insulating tube, and one end of the rubber mold extends on the outer periphery of the ground side electrode and the energized side electrode.