JPH0736293B2 - Anti-thunder insulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a lightning insulator for a high-voltage line having a connection structure, and is particularly electrically and mechanically stable and reliable against lightning surges. The present invention relates to a lightning insulator which has high performance and is easy to manufacture.

(Prior Art) Conventionally, as a lightning insulator with a built-in lightning arrester, cylindrical ground-side electrodes and power-discharging-side electrodes are fitted and fixed to the upper and lower ends of a pressure-resistant insulating cylinder with excellent mechanical strength such as FRP. ,
An integrated type has been proposed in which a lightning protection element having a non-linear voltage-current characteristic is housed between both electrodes, and a rubber mold is formed between the lightning protection element and the withstand voltage insulating cylinder and around the outer circumference of the withstand voltage insulating tube.

(Problems to be solved by the invention) When the conventional integrated lightning insulator is applied to a line of about 33 to 77 KV, no special problem in terms of manufacturing or use is found, but it is required to be 154 KV or more. The length of the lightning proof insulator is more than 1.5 m, and it is difficult to mount it on the insulator device on the tower. There is a problem of snarling.

Structure of the Invention (Means for Solving the Problems) In order to solve the above problems, the present invention is configured such that an intermediate electrode having a flange portion is fitted and fixed to the connection side end portions of a plurality of insulating cylinders and grounded. A grounding-side electrode is provided at the side end, and a charging-side electrode is provided at the charging-side end, and a lightning arrester having a non-linear voltage-current characteristic is connected in series in each insulating cylinder. The inside and outside of the insulating cylinder are integrally rubber-molded to form a plurality of lightning protection units, and the lightning protection units are joined together by bolts by connecting the flange portions of the intermediate electrodes via a watertight member, The watertight member is formed such that the rubber mold (15) bulges from the inside of the insulating cylinder to the upper surface of the flange portion of the intermediate electrode, and the outer peripheral portion thereof has the flange portion (13
b) A seal portion (16c) formed so as to be supported by a stepped portion (13e) recessed on the upper surface, and a means for providing an arcing ring on the ground side electrode, the intermediate electrode, and the voltage application side electrode. It is adopted.

(Operation) Since a plurality of lightning protection units are joined and fixed by bolts by connecting the flange portions of the intermediate electrodes thereof in the present invention, it is difficult to manufacture the lightning protection unit by using the conventional long one-body molded lightning protection unit. Very easy to transport and install.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 7, suspension insulators 3, 3 are rotatably hung on both left and right ends of the grounding side suspension fitting 2 attached to the tower body 1, and the suspension insulators 3, 3 A suspending metal fitting 4 having a discharge electrode 5 at the center is attached to the lower end, and an electric wire 7 is suspended and supported by a clamp 6 on the suspending metal fitting 4. Further, a lightning insulator 9 according to the present invention is attached to the bracket 8 attached to the center of the hanging fitting 2.

Next, the outline of the lightning protection element 9 will be described with reference to FIGS. 1 and 7. In this embodiment, the lightning protection element 9 is composed of two parts, an upper lightning protection unit U1 and a lower lightning protection unit U2.
Both of them are connected in series by bolts in a state where the flange portions 12b and 13b of the intermediate electrodes 12 and 13 are joined to each other.

As shown in FIG. 1 (a), the upper lightning protection unit U1 has a grounding side electrode 11 integrally formed with a mounting flange portion 11b having a bolt through hole 11c for fixing the upper lightning protection unit U1 to the bracket 8 at the upper end thereof. have. Further, an upper intermediate electrode 12 having a flange portion 12b in which a bolt insertion hole 12c is formed is provided below the upper lightning protection unit U1.

On the other hand, the lower lightning protection unit U2 is provided with a lower intermediate electrode 13 having a flange portion 13b having a bolt insertion hole 13c formed at an upper end thereof as shown in FIG.
A discharge electrode 19 is attached to the power-supply-side electrode 17 by a mounting member 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, the intermediate electrodes 12, 1
3, arcing rings 35, 35a, 35b are supported by a bracket (not shown) in the vicinity of the voltage application side electrode 17, as shown in FIG. Reference numeral 10 is a terminal for supplying a lightning surge current to a device for measuring the number of times of operation and the like when a lightning surge current flows, which are mutually connected by a cable not shown.

Next, the structure of the lightning protection device (a) will be described in detail with reference to FIG. 2. In the outer periphery of the upper end of the withstand voltage insulating cylinder 21 made of a material such as reinforced plastic (FRP) having excellent mechanical strength and heat resistance, The ground electrode 11 having the cylindrical portion 11a is fitted and fixed by an adhesive. A mounting flange 11b is formed on the outer circumference of the ground side electrode 11. Further, the bottomed cylindrical upper intermediate electrode 12 having a cylindrical portion 12a on the outer periphery of the lower end of the pressure-resistant insulating cylinder 21.
Are fitted and adhered by an adhesive, and a mounting flange 12b is integrally formed on the outer periphery thereof.

An element assembly 23 is housed in the withstand voltage insulating cylinder 21.
This element assembly 23 is formed by stacking a plurality of lightning protection elements 24, which are mainly made of zinc oxide (ZnO) and have a non-linear voltage-current characteristic, in series. 25 and 34 are joined together, and a coating 26 made of EPOM rubber is provided on the outer circumferences of the lightning protection element 24 and both element holding fittings 25 and 34. Further, a conductive spacer 33 made of a thin plate of lead is interposed between the lightning protection elements 24 to improve the electrical connection between the lightning protection elements 24.

In the internal thread 11d formed on the inner peripheral surface of the ground side electrode 11,
Tightening fitting 28 having male screw 28a on the outer peripheral surface (see FIG. 5)
Are fitted. The terminal fitting 10 is pierced and fixed in the insertion hole 28b at the center of the fastening fitting 28 through a cylindrical insulating spacer 29, and the tip of the terminal fitting 10 is projected to the upper end, and the base end and the element holder on the upper part of the element assembly 23 are pressed. Between the metal fittings 25, the lightning protection element 24
A spring 30 for applying a contact pressure is interposed therebetween. An element assembly 23 is pressure-bonded and fixed between the element pressing fitting 25 and the upper intermediate electrode 12. A plurality of shunts 31 (three in this embodiment) are interposed in the spring 30 to improve the electrical connection.

In the upper part, two intermediate parts and the lower part of the pressure-proof insulating cylinder 21,
Pressure-release holes 21a for emitting an arc at abnormal times are sequentially formed in the diametrical direction at intervals of 90 °.

A rubber mold 15 made of EPDM rubber is formed between the pressure-resistant insulating cylinder 21 and the element assembly 23, between the ground-side electrode 11 and the terminal fitting 10, and outside the pressure-resistant insulating cylinder 21. The upper intermediate electrode 12 extends to the outer peripheral surfaces of the cylindrical portions 11a, 12a, and the pleats 15a are integrally formed on the outer periphery. Further, the rubber mold 15 is provided with a thin portion 15b for pressure release at a position corresponding to the pressure release hole 21a of the pressure resistant insulating cylinder 21. Further, the passage 28 of the rubber mold 15 is provided on the outer periphery of the tightening fitting 28.
c is formed so that the molding rubber can be inserted between the terminal fitting 10 and the ground electrode 11.

Next, the structure of the lower lightning protection unit U2 will be described mainly with reference to FIG. It should be noted that members having the same functions as those of the upper lightning protection unit U1 are designated by the same reference numerals and the description thereof will be omitted. At the upper end of the pressure-resistant insulating cylinder 21, a cylindrical portion 13a and a flange portion 1
Lower intermediate electrode 13 having 3b and bolt insertion hole 13c is fitted, and tubular portion 13a is firmly fixed to pressure-resistant insulating tube 21 with an adhesive. A spring receiver 36 is interposed between the tightening metal fitting 28 (see FIG. 6) and the spring 32, and the upper end portion of the lower lightning protection unit U2 is made of rubber which is not attached to the tightening metal fitting 28 when the rubber mold 16 is molded. A seal portion 16c is formed which moves upward from the passage 28c and slightly rises from the flange upper end surface,
When the flange portions 12b and 13b are joined together, 13e has a function of packing and has a function of further perfecting the seal. A bottomed tubular power-supply-side electrode 17 having a tubular portion 17a protruding toward the center of the bottom is fitted and bonded to the lower end.

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

Now, when a lightning surge enters the electric wire 7 due to a lightning stroke, the electric current is discharged from the electric wire 7 from the clamp 6 → the hanging metal fitting 4 → the discharge electrode 5 through the air discharge gap G to the discharge electrode 19 under the lower lightning protection unit U2. , Element-holding bracket from the electrode 17 on the power-supply side to the bottom
After passing through the lightning protection element 24 through 34, through the lower intermediate electrode 13 at the upper end of the lower lightning protection unit U2, and the upper intermediate electrode 12 at the lower end of the upper lightning protection unit U1, from the lightning protection element 24 of the upper lightning protection unit U1 to the element pressing bracket 25 → shunt 31 → Terminal fitting 10 → Grounding side electrode 11 →
It flows from the tower body 1 to the earth through the hanging metal fitting 2. The follow-up current accompanying this is blocked by the lightning protection element 24.

As described above, even when exposed to an 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 U1 in the bolt-connected lightning protection insulator. In this embodiment, since two lightning protection units of appropriate length are connected to each other to secure the required length,
Each lightning protection unit is small, easy to manufacture, easy to transport, and extremely easy to install.

If an unexpected large-scale electric shock causes the lightning arrestor 24 to abnormally discharge and generate a high-temperature / high-voltage arc,
Part of the coating 26 near the pressure relief hole of 21 and rubber mold 15, 16
Is softened or melted and destroyed, and is scattered by the high-pressure gas to forcibly form the arc discharge path communicating with the outside. Since arcing rings are attached to both ends of each lightning protection insulator, the arc transfers to the arcing rings and damage can be suppressed.

The present invention is not limited to the above embodiment, but can be embodied in the following other examples.

(1) In the above embodiment, the lightning protection element 9 is formed by connecting 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 a lower structure of the upper lightning protection unit U1 and an upper structure of the lower lightning protection unit U2 is used. By connecting bolts to the intermediate portion of the unit U1 and the unit U2, three connected lightning insulators 9 can be obtained.

(2) Although the watertight measure of the flange connecting portion is applied to the upper end portion of the lower lightning protection unit U2 in the above-mentioned embodiment, it can be applied to the lower end portion of the upper lightning protection unit U1 and the upper end portion of the lower lightning protection unit U2. It is also possible to apply both to the lower end of the upper lightning protection unit U1.

EFFECTS OF THE INVENTION The present invention provides a lightning protection for a high voltage line, which is difficult to manufacture with a conventional long-integral lightning protection,
It has an excellent effect that it is extremely easy to carry and install.

[Brief description of drawings]

1 is a front view showing the upper and lower lightning protection units, FIG. 2 is a semi-longitudinal sectional view showing the upper lightning protection unit, FIG. 3 is a semi-longitudinal sectional view showing the lower lightning protection unit, and FIG. FIG. 5 is a perspective view showing a combined state of the lightning protection unit, FIG. 5 and FIG. 6 are perspective views showing a fastening metal fitting, and FIG. 7 is a front view showing an insulator device equipped with a lightning protection insulator. 9 ... Insulator, 11 ... Grounding side electrode, 12 ... Upper middle electrode, 12a, 14a ... Cylindrical part, 12b, 13b ... Flange part, 13 ...
… Lower middle electrode, 17 …… Voltage-side electrode, 24 …… Lightning arrester,
35,35a, 35b …… Arching ring.

Claims (3)

[Claims] 1. An intermediate electrode having a flange portion is fitted and fixed to a connecting side end portion of a plurality of insulating cylinders (21), a ground side electrode is provided at the ground side end, and a power application side end portion is provided. Each of the insulation side electrodes is provided, and a lightning arrester element (24) having a non-linear voltage-current characteristic is connected in series in each insulation cylinder in a laminated manner. The lightning protection unit is formed by connecting the flange portions of the intermediate electrodes to each other through a watertight member and connecting them by bolts. The watertight member has a rubber mold (15) from the inside of the insulating cylinder to the middle. It is a seal part (16c) that is formed so as to bulge on the upper surface of the flange part of the electrode, and its outer peripheral part is supported by the step part (13e) recessed in the upper surface of the flange part (13b). , Further arcing to the ground side electrode, the intermediate electrode, and the charging side electrode respectively Ring (35, 35a, 35b) lightning protection insulator, characterized in that a. 2. The cylindrical parts (11a, 12a, 13a) of the grounding side electrode, the intermediate electrode and the charging side electrode are fitted and fixed to the outer peripheral part of the insulating cylinder (21). Lightning proof insulator described in. 3. The lightning insulator according to claim 2, wherein the rubber mold covers the outer peripheral surface of the cylindrical portion (13a) of each electrode.