JPS62283506A - Lightning-proof 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] 3. Detailed Description of the Invention Purpose of the Invention (Industrial Field of Application) The present invention provides a high voltage ! The present invention relates to a lightning-resistant insulator for J,'t8, and particularly to a lightning-resistant insulator that is electrically and mechanically stable and highly reliable against lightning surges, and is easy to manufacture.

(Prior art) Conventionally, as a lightning insulator with a built-in lightning arrester, a cylindrical grounding side electrode and a cylindrical energizing side electrode are fitted and fixed to the upper and lower ends of a voltage-resistant insulating tube with excellent mechanical strength such as FRP, respectively. An integrated type has been proposed in which a lightning arrester with non-linear voltage-current characteristics is housed between the two electrodes, and rubber molding is applied between the lightning arrester T and the voltage-resistant insulating tube and on the outer periphery of the voltage-resistant insulating tube. There is.

(Problems to be Solved by the Invention) When applying the conventional integrated lightning insulator to lines of about 33 to 77 KV, there are no particular problems in terms of manufacturing or use. The length of lightning-resistant insulators has increased to over 1.5m, making it suitable for manufacturing such as one-piece molding and assembling element P, for transportation such as transporting and handling in mountainous areas, and for installation on insulator equipment on top of towers. The problem is that it is difficult.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention fixes an intermediate electrode having a flange portion to the connecting end of a plurality of insulating cylinders, and One grounding pole is provided at the side end, and a current-side electrode is provided at the power-supplying end, and lightning arrester elements with non-linear voltage-current characteristics are connected in series in a stacked manner within each insulating cylinder. The inside and outside of each insulating tube are integrally molded with rubber to form a plurality of lightning protection units, and the flange portions of the intermediate N poles are joined to each other via a watertight member and connected by bolts. In addition, a ground side electrode, an intermediate electrode, a
A method of providing an arcing ring on the first side electrode is adopted.

(Function) The present invention connects and fixes a plurality of lightning protection units by joining the flange portions of their intermediate electrodes with bolts, so that the lightning protection insulator P, which is difficult to achieve with conventional long one-piece molded lightning protection insulators, can be fixed. Manufacturing, transportation and installation become extremely easy.

(Example) An example embodying the present invention will be described below with reference to FIGS. 1 to 7. As shown in Fig. 7, hanging insulators f3.3 are rotatably hung from both left and right ends of the ground side hanging fitting 2 attached to the tower body 1, and both hanging insulators 3,3 At the lower end, a power-supply-side hanging fitting 4 having a discharge electrode 5 in the center is arranged.
An electric wire 7 is suspended from the hanging fitting 4 via a clamp 6. Further, a lightning insulator 9 according to the present invention is attached to a bracket 8 attached to the center of the hanging fitting 2.

Next, the il! of the lightning insulator 9 is shown in FIGS. 1 and 7.
To explain the main point, in this embodiment, the #4 insulator 9 consists of two parts: an upper lightning protection unit U1 and a lower lightning protection unit U2. Pol 1 ~ in the joined state
are connected in series.

As shown in FIG. 1<a>, the upper lightning protection unit U1 has a mounting flange portion 1 having a bolt insertion hole 11c at its upper end for fixing the upper lightning protection unit U1 to the bracket 8.
1b has an integrally formed ground side N pole 11. In addition, a bolt insertion hole 12 is provided at the bottom of the upper lightning protection unit U1.
Upper intermediate electrode 1 having a flange group 12b forming C
2 is provided.

On the other hand, as shown in FIG. 1(b), the lower lightning protection unit U2 includes a lower intermediate electrode 13 having a flange portion 13tl in which a bolt insertion hole 13c is formed at the upper end, and a energized side electrode 17 is provided at the lower end. A discharge electrode 19 is attached to the charging side electrode 17 with a mounting fitting 18, and an air discharge gap G is formed between the discharge electrode 19 and the discharge electrode 5.

As shown in FIG. 7, the ground side electrode 11 and the intermediate electrode 12
, 13, Charge [+1! Near the I electrode 17, as shown in FIG. 5, an arcing ring 35.35a35b is supported by a bracket (not shown). Reference numeral 10 denotes a terminal for supplying the lightning surge current to an enclosure for counting the number of operations and other measurements when the lightning surge current flows, and is connected to each other by a cable (not shown).

Next, the structure of the lightning insulator device (a') will be explained in detail using FIG. A ground side electrode 11 having a cylindrical portion 11a is fitted and fixed with an adhesive. A mounting flange 11b is formed on the outer periphery of the ground side electrode 11. Further, an upper intermediate electrode 12 having a bottomed cylindrical shape and having a cylindrical portion 12a is fitted and bonded to the outer periphery of the lower end of the voltage-resistant insulating cylinder 21 with an adhesive.
A mounting flange 12b is integrally formed on its outer periphery.

An element assembly 23 is accommodated within the voltage-resistant insulating cylinder 21 . This element assembly 23 has a plurality of lightning arrester elements F-24, which are mainly made of zinc oxide (ZnO) and has non-linear voltage-current characteristics, stacked in series. Join the presser metal fittings 25.34 and attach the lightning arrester? 24 and the outer periphery of the pixel holding metal fitting 25 and 34.
It is constructed by providing a cover 26 made of DM rubber.

Further, a conductive spacer 33 made of four lead plates is interposed between each lightning arrester cable 24 to improve the electrical connection between each lightning arrester cable 24.

The female thread 11d formed on the inner circumference of the ground side electrode 11 has a tightening fitting 28 (fifth
Figure ＠) is fitted. A terminal fitting 1o is fixed through the insertion hole 28b at the center of the wired fitting 28 via a cylindrical insulating spacer 29, and its tip protrudes to the upper end, and its base end and an element holder on the upper part of the element assembly 23 are fixed. Metal fittings 25
Is there a lightning arrester between them? A spring 3o is interposed to apply contact pressure to 24. An element assembly 23 is crimped and fixed between the element holding fitting 25 and the upper intermediate electrode 12. Note that the spring 30 has a plurality of shunts 31 (in this embodiment, three shunts 31).
) are interposed to make a good electrical connection.

Pressure release holes 21a for emitting arcs during abnormal operation are sequentially formed at intervals of 90' in the upper part, the middle part, and the F part of the voltage-proof/insulating cylinder 21 in the diametrical direction.

A rubber mold 15 made of EPDM rubber is formed between the voltage-resistant insulation cylinder 21 and the element assembly 23, between the ground side electrode 11 and the terminal fitting 10, and on the outside of the voltage-resistant insulation cylinder 21.
a cylindrical portion 11a of the ground side electrode 11 and the upper intermediate electrode 12;
It extends to the outer peripheral surface of 12a, and pleats 15a are integrally formed on the outer periphery. Further, the rubber mold 15 is provided with a pressurizing portion 15b at a position corresponding to the pressure release hole 21a of the pressure-resistant insulating cylinder 21. Roughly speaking, a passage 28C for the rubber mold 15 is formed on the outer periphery of the fastening metal fitting 28, and the molding rubber is also inserted between the terminal metal fitting 10 and the ground side electrode 11.

Next, the structure of the lower lightning protection unit U2 will be explained with reference to FIG. 3. Incidentally, members having the same functions as those of the upper 'ff41 unit U1 are given the same reference numerals and explanations thereof will be omitted. A cylindrical portion 13 is provided at the upper end of the voltage-resistant insulating tube 21.
A, a lower intermediate electrode 13 having a flange portion 13b and a bolt insertion hole 13c is fitted, and the cylindrical portion 13a is firmly fixed to the voltage-resistant insulating cylinder 21 with an adhesive. A spring receiver 36 is interposed between the tightening fitting 28 (see FIG. 6) and the spring 32, and the upper end of the lower lightning protection unit U2 is covered with rubber when forming the rubber mold 16. A seal portion 16C is formed that moves upward from the passage 28c and rises slightly from the upper end surface of the flange, and
When the flange portions 12b and 13b are joined, the flange 13e acts as a backing and has the function of making the seal more complete. A bottomed cylindrical power supply side electrode 17 having a cylindrical portion 17a protruding from the center of the bottom is fitted and adhered to the lower end.

Next, the operation of the appendix T configured as described above will be explained.

Now, when a surge enters the electric wire 7 due to a lightning strike, the current is discharged from the electric wire 7 to the clamp 6 → the hanging metal fitting 4 → the discharge electrode 5 through the air discharge gap G to the discharge electrode 19 at the bottom of the lower lightning protection unit U2. It flows from the power-supplying side electrode 17 to the lightning arrester element 24 via the element F holding fitting 34 of the F part, and flows to the lower intermediate electrode 13 at the upper end of the lower lightning protection unit U2, and the upper lightning protection unit U.
1. Hold the upper intermediate electrode 12 at one end of the T, and connect it from the snow protection element F24 of the upper lightning protection unit U1 to the element T holding fitting 25 - east shunt 31 → terminal fitting 10 → ground side electrode 11 → hanging fitting 2 to the tower body 1. flows from to the earth. The subsequent flow accompanying this is blocked by the lightning arrester 24.

As mentioned above, even when exposed to abnormally high voltage due to a lightning surge, the surge current flows from the lower lightning protection unit U2 to the upper lightning protection unit U in the bolt-connected lightning insulator.
Flows to 1. In this example, two lightning protection units of appropriate length are connected to secure the necessary length, so each lightning protection unit is small and easy to manufacture and transport, and it is also easy to install. It's extremely easy.

Note that if the lightning arrester element 24 is abnormally discharged due to an unexpected large-scale electric shock and a high-temperature, high-pressure arc is generated, a portion of the coating 26 near the pressure relief hole of the voltage-resistant insulating cylinder 21 and a portion of the rubber mold 15.16 will be damaged. It is softened or melted and destroyed, and is blown away by high-pressure gas, forcibly forming an arc discharge path leading to the outside.

Since arcing rings are attached to both ends of each lightning insulator, the arc transfers to the arcing rings and damage can be suppressed.

The present invention is not limited to the above embodiments, but may be embodied separately as follows.

(1) In the above embodiment, the lightning protection unit T9 is made by connecting two lightning protection units, the upper lightning protection unit U1 and the lower lightning protection unit U2, but it is also possible to connect three or more lightning protection units. For example, when connecting three lightning protection units, in addition to the above-mentioned upper lightning protection unit U1 and lower lightning protection unit U2, a lightning protection unit consisting of the lower structure of the upper lightning protection unit U1 and the upper structure of the lower heavy duty unit U2 is connected to the upper lightning protection unit U1 and the lower lightning protection unit U2. By connecting the intermediate parts of the lightning protection unit U1 and unit U2 with bolts, three connected lightning protection insulators 9 can be obtained.

(2) Water in the connecting part of 2 lunges! Although the countermeasure was applied to the upper end of the lower lightning protection unit U2 in the above embodiment, it can also be applied to the lower end of the upper lightning protection unit U1. It is also possible to apply it to both sides.

Effects of the Invention This invention is a lightning insulator for high-voltage lines, which is difficult to manufacture with conventional long integrally molded lightning insulators.
It has the excellent effect of being extremely easy to transport and install.

[Brief explanation of the drawing]

Figure 1 is a front view showing the upper and lower lightning protection units, Figure 2 is a vertical sectional view showing the upper lightning protection unit, Figure 3 is a half longitudinal sectional view showing the lower lightning protection unit, and Figure 4 is the upper and lower lightning protection units. A perspective view showing the combined state of the lower lightning protection unit, FIG.
FIG. 6 is a perspective view showing a fastening fitting, and FIG. 17 is a front view showing an insulator device equipped with a lightning insulator. 9... Insulator F body, 11... Ground side electrode, 12... F
Part intermediate electrode, 12a, 14a... Cylindrical part, 12b, 1
3b...Flange portion, 13...Lower intermediate electrode, 17
...Electricity side electrode, 24...Lightning arrester element, 35.35a
, 35b... arcing ring. Patent applicant Nippon Insulator Co., Ltd. Agent Patent attorney On 1) Hironobu 115 Figure 6

Claims (1)

[Claims] 1. An intermediate electrode having a flange portion is fitted and fixed to the connection side end of the plurality of insulating cylinders (21), a grounding side electrode is fitted to the grounding side end, and a grounding side electrode is fitted to the connecting side end of the plurality of insulating cylinders (21), and a grounding side electrode is fitted to the grounding side end, A charging side electrode is provided in each part,
A lightning arrester element (24
) are connected in series in a laminated manner, and the inside and outside of each insulating cylinder are integrally molded with rubber to form a plurality of lightning protection units, and these lightning protection units are connected to the flange of the intermediate electrode through a watertight member. A lightning insulator characterized in that they are joined together and connected by bolts, and that arcing rings (35, 35a, 35b) are provided on the ground side electrode, the intermediate electrode, and the energized side electrode, respectively. 2. The cylindrical part of the grounding side electrode, intermediate electrode and energizing side electrode (1
1a, 12a, 13a) are fitted and fixed to the outer periphery of the insulating cylinder (21), the lightning insulator according to claim 1. 3. The watertight member is a seal part (16c) formed by expanding a rubber mold (15b) from inside the insulating cylinder to the upper surface of the flange part of the intermediate electrode, and its outer peripheral part is
3b) The lightning insulator according to claim 1, which is supported by a stepped portion (13e) recessed in the upper surface. 4. The lightning insulator according to claim 2, wherein the rubber mold covers the outer peripheral surface of the cylindrical portion (13a) of each electrode.