JPS61243615A - Arresting insulator - 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 (Industrial Application Field) The present invention relates to a lightning arrester having a built-in lightning arrester element, and more specifically relates to a lightning arrester used in an insulator device for an overhead power transmission line. be.

(Prior Art) Conventionally, the one shown in FIG. 9 has been proposed as a lightning arrester having a built-in lightning arrester element. To explain this lightning arrester, flange fittings 52 and 53 are fitted to the upper and lower ends of a hollow porcelain insulator tube 51 having outer folds 51a, respectively, and fixed by cementing 54. Terminals [57, 58 with rupture discs 59, 60 are fixed to the end faces of both flange fittings 52, 53 through packings 55, 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 6 near the outer periphery of a support plate 65 joined to both upper and lower ends, and tightening them with nuts 67 to clamp and fix them integrally. There is.

(Problems to be Solved by the Invention) However, in the conventional lightning arrester, moisture causes cementation.
4 or the joint surface between the flange fitting 53 and the terminal plate 58, and further passes through the material of the packing 56 and enters the porcelain insulator tube 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. Also, both flange fittings 52.5
There was a problem in that the overall length increased depending on the length of the metal parts such as 3 and the pressure relief path forming cover 61.

Further, the lightning arrester has an insulating rod 6 on the outer periphery of the lightning arrester element 64.
6 is arranged and the lightning arrester element 64 is fixed using the same rod 66, a large storage space is required, and since the wall thickness of the magnetic insulator tube 51 is large, the lightning arrester becomes larger in the lateral direction. At the same time, the lightning arrester element 64 is likely to be displaced laterally due to vibration or the like. Furthermore, since they are connected using bolts, there is a problem in that the bolts loosen due to vibration and the lightning arrester insulators 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, the present invention has a grounding side electrode and a power supplying side electrode fitted and fixed to the upper and lower ends of a voltage-resistant insulating cylinder, respectively, and a connection between the two electrodes. A plurality of lightning arrester elements are stacked in series and interposed therebetween, the voltage-applying side electrode is shaped like a cylinder with a bottom, 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 insulation cylinder, and the A configuration is adopted in which one end of the mold extends over the outer peripheral surfaces of the ground side electrode and the energized side electrode.

(Function) In the present invention, airtightness is improved by the rubber mold extending on the outer circumferential surfaces of the ground side electrode and the energized side electrode, and 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 circumferential surface of both electrodes, and the insulation properties are improved. is downsized.

Furthermore, the lightning arrester elements are laminated and fixed using a rubber mold.
The storage space becomes smaller, the lightning arrester becomes smaller, and displacement of the lightning arrester element due to vibration or the like is prevented.

(Example) An example embodying the present invention will be described below with reference to FIGS. 1 to 8. As shown in Fig. 1, the steel tower 1 has hanging metal fittings 2.
is tightened and fixed with bolts 3, and a hanging bracket 4 is supported by the hanging bracket 2 so as to be perpendicular to the hanging bracket 2, and a connecting cork 6 is connected to the hanging bracket 4 via a connecting pin 5. Suspension insulators 7.7 are rotatably supported at both left and right ends of the connecting yoke 6 via connecting pins 8, respectively.

First connection links 10.10 are supported at the lower ends of both suspension insulators 7.7 via connection pins 9, respectively.
0.10 has connecting pin 11. A connecting yoke 12 is supported via 'll. 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.

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, the third,
As shown in Fig. 4, a voltage-resistant insulating cylinder 21 made of a material such as reinforced plastic (FRP) with excellent mechanical strength has a cylindrical ground side electrode 22 having a stepped portion 22a at the upper end, and a stepped portion 23a at the lower end. The cylindrical power-supply-side mounting fittings 23 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 tube 21, and annular grooves 22b and 23b are also formed on the inner circumferential surfaces of the ground side electrode 22 and the power-supplying side mounting bracket 23 to increase the bonding area. This strengthens the adhesion. The support fitting 20 is fitted onto the upper outer periphery of the ground side electrode 22 . Furthermore, gas escape holes 21b are formed in the upper, middle, and lower parts of the voltage-resistant insulating cylinder 21 at intervals of 180° in the diametrical direction of the insulating cylinder 21, as shown in FIG. 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.

The lower inner circumferential surface of the power supply side mounting bracket 23 has a female thread 23C.
is formed, and a male thread 25a is formed on the outer peripheral surface as shown in FIG.
After screwing together the fastening fitting 25 having
A stop ring 26 fitted to the lower part prevents loosening. A female thread 25b is formed on the inner peripheral surface of the fastening metal fitting 25, and a metal fitting 27 is screwed into the spring receiver having a male thread 27a.

In addition, a male screw 2 is provided on the lower outer peripheral surface of the power supply side mounting bracket 23.
3d is formed, and a bottomed cylindrical energizing side electrode 28 having a female thread 28a is screwed and fixed thereto.

A ring-shaped protrusion 28b is protruded near the center of the bottom of the energizing side electrode 28, and the spring receiver has a plurality of disc springs between it and the metal fitting 27 to prevent the energizing side electrode 28 from loosening. 29 is interposed. 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, a plurality of lightning arrester elements 31 made of a material mainly composed of zinc oxide and having non-linear voltage-current characteristics are stacked in series. As shown in FIG. 7, a metallicon 32 is applied to the upper and lower surfaces of each lightning arrester element 31, and between each element 31 there is a conductive substrate #t made of a thin plate of soft metal (lead (Pb) in this embodiment). 33 is interposed to improve the electrical connection between each lightning arrester element 310. 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. A plurality of disc springs 3 that apply contact pressure to the lightning arrester element 31 are connected to the leakage current extraction terminal 36.
B and a conductive spacer 39 for contact pressure adjustment are interposed. Note that a conductive member 40 having an opening in cross section is attached to the inner spring 38.
It is interposed at a certain point to improve the electrical connection.

Further, an element holding fitting 35 is disposed at the lower end of the lightning arrester 31 via a conductive spacer 33, and a disc spring 38 similar to that described above is disposed between the spring holding fitting 41 and the spring holding fitting 41 engaged with the upper surface of the clamping fitting 25. and a conductive spacer 39 are interposed, and the disc spring 38
A conductive member 40 similar to the 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, the locking part 36a of the leakage current extraction terminal 36, the conductive spacers 39, 39, the spring holding fitting 41
The outer peripheral surfaces of 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, and the lightning arresting element 31 is integrated with the leakage current extraction terminal 36 and the spring holding fitting 41. It is stored and fixed in a shape. This heat shrink tube 42 makes the lightning arrester 3
1 due to moisture absorption, displacement due to vibration, etc., and rubber entering between the lightning arrester elements 31 when forming the rubber mold 44 described later, the lightning arrester element 31 is further made compact, and the lightning arrester 19 is miniaturized. It becomes possible. The heat-shrinkable tube 42 is formed to have a thickness of 1 to 4 mm so as to fit into the 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. ing. Note that by bonding the heat shrinkable tube 42 and the lightning arrester element 31, it is possible to more completely prevent the generation of voids and improve the element holding function.

Between the voltage-resistant insulation cylinder 21 and the lightning arrester element 31, between the grounding side electrode 22 and the leakage current extraction terminal 36, and between the voltage-resistant insulation cylinder 2
A rubber mold 44 made of heat-shrinkable EPI) M rubber is formed on the outside of the lightning arrester 19 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. The creeping insulation distance is increased, and pleats 44a are integrally formed on the outer periphery. This rubber mold 44 is made of EPDM rubber in a fluid state at about 150°C.
It is molded by injection at a pressure of about 50 kg/c++I.

Annular grooves 2 on the inner side of the upper part and the outer side of the lower part of the ground side electrode 22
2d, in 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, under the conditions when EPDM rubber is injected, DM rubber and metal are bonded to improve airtightness. Vulcanized adhesive is pre-applied. In addition, the ground side electrode 22 and the leakage current extraction terminal 36
The rubber mold 44 between the ground electrode 22 and the ground electrode 22 is formed by rubber that flows in from the through hole 22e inside the ground electrode 22 during molding.

Furthermore, as shown in FIG. 5, the rubber mold 44 is provided with a pressure release port 44b at a position corresponding to the gas escape hole 2]b of the pressure-resistant insulating cylinder 21.

The lightning arrester 19 is attached to the connecting yoke 6 so that the pressure relief port 44b is perpendicular to the electric wire 17 to prevent the suspension insulator 7 from being burnt out due to arc discharge during an abnormality.

An arcing ring arm 45 is fixed with a bolt to the mounting piece 20a provided on one side of the support fitting 20, and an arcing ring is provided at the tip of the arcing ring arm 45 so as to correspond to the upper pressure release port 44b. A ring 46 is provided. 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. An arcing ring 46 is provided so as to substantially correspond to the pressure relief port 44b.

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-second connection link 14 from the discharge electrode 12a of the yoke 12 through the air discharge gap G to the discharge electrode 30 causing an arc discharge. and the voltage-applying side electrode 28
From the power-supplying side mounting bracket 23 - the clamping bracket 25 - the spring holding fitting 41 - the conductive spacer 39 - the conductive member 40 → the lower element holding fitting 35, the flow flows to the lightning arrester element 31, and then the upper element holding fitting 35 - the conducting member. 40 - Conductive spacer 39 - Leakage current flows from the steel tower 1 to the ground via the connection yoke 6 and the lead-out terminal 36. The subsequent current caused by this is blocked by the lightning arrester element 31.

Furthermore, if the lightning arrester 31 is abnormally discharged due to an unexpected large-scale lightning strike and a high-temperature, high-pressure arc is generated, a portion of the heat-shrinkable tube 42 and a portion of the rubber mold 44 near the gas escape hole 21b of the voltage-resistant insulating tube 21 will be damaged. is softened or melted and destroyed, and is scattered 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 ground side electrode 22 and the energized side electrode 2
The rubber mold 44 extending to the outer peripheral surface of the lightning arrester 19 can improve the airtightness of the lightning arrester 19, prevent moisture from entering into the voltage-resistant insulating cylinder 21, and prevent deterioration of the lightning arrester element 31 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 circumferential surface of both electrodes 22, 28, thereby improving the insulation properties, compared to the conventional lightning arrester having the same creepage insulation distance. Compared to this, the lightning arrester 19 can be made smaller.

Furthermore, the lightning arrester element 31 can be stacked and fixed by the rubber mold 44, 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.

Furthermore, since the lightning arrester element 31 is built in by the pressure-resistant insulating tube 21 made of FRP and the rubber mold 44, the lightning arrester 19 can be significantly reduced in weight.

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

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

(2) The heat-shrinkable tube 42 may be made of polyethylene or fluorine resin instead of EPDM rubber.

(3) The rubber mold 44 may be formed of silicone rubber or butyl rubber instead of EPDM rubber.

Note that it is desirable that the molding material and the heat shrinkable 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, thereby preventing moisture from entering the voltage-resistant insulating cylinder. It is possible to prevent moisture absorption and deterioration of the lightning arrester element. 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, compared to conventional lightning arresters having the same creepage insulation distance, the lightning arrester can be made smaller, and there is an excellent effect of preventing displacement of the lightning arrester element due to vibration or the like.

[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, and Fig. 3.4.
The figure is a half-longitudinal cross-sectional view showing the main parts, and Figure 5 is A of Figure 3.
- A reduced end view on the line A, FIG. 6 is a reduced end view on the B-B line in FIG. 4, FIG. 7 is a partially enlarged sectional view of the lightning arrester, and FIG.
FIG. 9 is a reduced end view taken along the line C--C in the figure, and a vertical cross-sectional view showing a conventional lightning arrester. 21... Voltage-proof insulating tube, 22... Ground side electrode, 28...
...Electricity side electrode, 31...Lightning arrester element, 42...Heat shrink tube, 44...Rubber mold.

Claims (1)

[Scope of Claims] 1. A grounding side electrode and a charging side electrode are fitted and fixed to the upper and lower ends of a voltage-resistant insulating cylinder, respectively, and a plurality of lightning arrester elements are stacked in series and interposed between the two electrodes, The power side electrode is shaped like a cylinder with a bottom, and 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 attached to the outer periphery of the grounding side electrode and the voltage-bearing side electrode. A lightning arrester characterized by extending over a surface. 2. The lightning arrester according to claim 1, wherein the ground side electrode and the energized side electrode have an annular groove on their outer peripheral surfaces into which the rubber mold enters.