JPS6212013A - Thunderproof horn 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] Purpose of the Invention (Field of Industrial Application) This invention is intended to quickly ground the abnormal high voltage caused by lightning when it is applied to a power transmission line, and to prevent the subsequent arcing from occurring. The present invention relates to a lightning horn insulator device for overhead power transmission lines, particularly for tension towers, for preventing power transmission lines from melting down.

(Prior Art) Conventionally, as a device for installing a lightning arrester with a predetermined air discharge gap on a power transmission line, for example,
There was a device disclosed in Publication No. 8.

As shown in FIG. 6, this device fixes a tension-resistant insulator 47 that supports electric wires 46 to a tower body 45, and
A lightning arrester 49 in which a valve resistance element (non-linear resistance element) is enclosed is integrally formed on the upper side of 7 via a support fitting 48, and an electrode 50 is also provided at the tip of the tension-resistant insulator 47. The lightning arrester 49 was configured to face an electrode 51 provided at the tip thereof with an air discharge gap G therebetween.

(Problems to be Solved by the Invention) However, in the conventional device, the base end of the tension-resistant insulator 47 and the base end of the support fitting 48 are integrally formed, so that the existing tension-resistant insulator It was difficult to attach the lightning arrester 49 using the lightning arrester 47 and configure the device. Also, lightning insulator 49
There was a problem in that stress concentration occurred in the tension-resistant insulator 47 and the support fitting 48 due to the bending moment due to its own weight, and the mechanical strength of the device decreased.

In view of the above circumstances, the present invention aims to provide a lightning-resistant horn insulator device that can be applied to existing tension-resistant insulators.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention connects the tension insulator 17 to the support arm 1 of the tower body via the tower body side connecting fitting, and also An electric wire 26 is installed on the tension insulator I7 via a wire-side connecting fitting, and a lightning arrester 28 is attached to the tip of the support arm 1 via an adapter 10 so as to be positioned above the tension insulator 17. At the same time, a discharge electrode 32 on the energizing side is supported upwardly on the wire-side connecting fitting, and the discharge electrode 3 is attached to the tip of the lightning arrester 28.
．． 4 and the discharge electrode 32 of the above-mentioned energizing example are arranged to face each other with a predetermined aerial discharge gap G2.

(Operation) This invention operates as follows by employing the above means.

When the swinging of the electric wire due to wind pressure or the like acts on the device, the device itself swings around the tower-side connecting fitting. At this time,
The tension insulator swings independently of the lightning arrester, and no unreasonable stress concentration occurs in the tower body side connecting fittings, adapters, lightning arrester, and tension insulator.

Furthermore, snow caps and rainwater on the support arm will not travel to the lightning arrester through the adapter.

Furthermore, application to an existing tension insulator device can be easily carried out by attaching the lightning arrester via an adapter.

(Example) Hereinafter, an example embodying the present invention will be described in detail based on FIGS. 1 to 4.

As shown in FIG. 2, the support arm I of the tower body is interposed between a pair of left and right horizontal support frames 2.3 and the tips of the horizontal support frames 2.3, and is secured by bolts 4 and nuts 4a. The connecting plate 5 is fixed, the inclined frame 7 is connected to the connecting plate 5 by a bolt 6 and a nut 6a, and the lower surface of the tip of the horizontal support frames 2 and 3 is connected by a bolt 8 and a nut 8a. It is composed of a mounting bracket 9 for a tension-resistant insulator to be fixed.

The bolts 8 are attached to the support frame 2.3 in the existing tower body.
In this embodiment, the existing short bolts are replaced one by one with long bolts 8 in the installed state, and then
Using the upper end portions of the bolts 8 to 8, an adapter 10 for attaching the lightning arrester 28 described above is attached with a nut 8b.

Next, a pair of tension-resistant insulator devices (the right side will be omitted because they have almost the same configuration) respectively connected to both the left and right ends of the mounting bracket 9 will be described.

A U clevis 11 is fixed to the mounting fitting 9 with bolts, and a U clevis 12 is rotatably connected to the clevis 11. A tower side horn mounting bracket 13 is connected to the U clevis 12 so as to be relatively rotatable in the vertical direction by a shaft 14, and a pole is connected to one end of the bracket 13 to be relatively rotatable in the vertical direction by a shaft 15. A tension insulator 17 is connected via a clevis 16. In this embodiment, as described above, the clevises 11 and 12, the tower side horn mounting bracket 13,
The hole clevis 16 constitutes a tower side connecting fitting.

A socket clevis 1 is provided at the end of the tension insulator 17 on the power supply side.
A wire-side horn mounting bracket 19 is connected to a shaft 20 via a shaft 8 so as to be relatively rotatable in the vertical direction. A parallel clevis link 22 is connected to one end of the horn mounting bracket 19 by a shaft 21 so as to be relatively rotatable in the vertical direction. 24 are connected to each other, and an electric wire 26 is supported on the link 24 via an electric wire clamp 25.

Further, a jumper wire 27 is connected between the wire clamp 25 and the wire crank of the right tension insulator (not shown). In this embodiment, the above-mentioned socket clevis 18, wire-side horn attachment fitting 19, parallel clevis link 22, connection link 24, and wire clamp 25 constitute a wire-side connection fitting.

On the other hand, on the swash plate tOa of the mounting bracket 10, a lightning arrester 28 having a built-in resistance element with non-linear voltage-current characteristics is cantilevered upward.

This lightning arrester 28 is located in a vertical plane passing through the central axis of the tension insulator 17.

As shown in FIG. 31.

An arc horn 32 serving as a discharge electrode on the energizing side extending obliquely upward is fixed to the wire side horn mounting bracket 19 with a bolt 33, and is opposed to the arc horn 29.29 with a predetermined air discharge gap 19G1. There is.

Further, an arc horn 34 serving as a discharge electrode is attached to the tip of the lightning arrester 28. Same arc horn 34
As shown in FIG. 3, the mounting plate 35 is attached to the tip projection 28a of the lightning arrester 28 with bolts, and the mounting plate 35 has an adjustable protruding length and a vertically extending The long holes 35a and 36a are made to correspond to each other so that the rotational position can be adjusted.
It is composed of a connecting piece 36 attached by a bolt 37 and a nut 37a, and a horn 39 fixed to the connecting piece 36 by a bolt 38 and a nut 38a so that its rotational position in the horizontal direction can be adjusted. There is.

The arc horn 32 and a predetermined air discharge gap G
They are facing each other with 2. The arc horn 32 is also used as a discharge electrode on the energizing side of the arc horn 29.34. Here, in order to operate this device normally, the insulation strength of the air discharge gap G2 is configured to have a margin of at least a certain value with respect to the insulation strength of the lightning arrester 28.

Next, the operation of the lightning horn insulator device configured as described above will be explained.

Now, when an abnormally high voltage caused by a lightning strike is applied to the wire 26, the current is discharged in the air discharge gap G2 properly maintained between the arc horn 32 and the arc horn 34, and the lightning arrester It flows through a non-linear resistance element built in 28 to the support arm 1 of the tower body. Furthermore, the subsequent arc generated thereafter is blocked by the air discharge gap G2 and the nonlinear resistance element. On the other hand, if the insulation strength is reduced due to extremely abnormal contamination or other causes and an arc occurs along the creeping surface of the tension insulator 17, the arc will be generated in the air discharge gap ci between the arc horns 32 and 29, and the tension insulator will Burnout of I7 is prevented, and arc propagation to the tower body is also prevented.

The device of this embodiment simply attaches the lightning arrester 28 to the support arm 1 via the adapter 10 without operating the existing tension insulator 17 itself attached to the support arm 1 of the tower body. This makes it a lightning-resistant horn insulator device, which expands the scope of application and is very practical.

In addition, even if the tension insulator 17 rotates around the U clevis 12 due to shaking due to wind pressure or the like acting on the electric wire 26 in the pole-mounted state, the lightning arrester 28 is not affected at all. 17. There is no unreasonable stress on the tower side connecting fittings and the lightning arrester 28, and the mechanical strength of the device is improved.

Furthermore, since the lightning arrester 28 is positioned above the tip of the support arm 1 via the adapter 10, rainwater and snow on the support arm 1 are prevented from moving to the lightning arrester 28. Therefore, the stain resistance of the lightning arrester 28 is improved, and the discharge gap G2 of the arc horn 32, 34 is not adversely affected.

Furthermore, compared to a lightning horn insulator device in which the lightning arrester 28 is located between the tower body and the electric wire 26, it is easier to ensure a safe distance between the tower body and the lightning arrester 28.

Moreover, this invention can also be implemented as follows.

(1) As shown in FIG. 5, attach the adapter 10 using the bolt 8 and nut 8b on the left side.

In this case, a spacer 40 is interposed between the adapter 10 and the nano h 8 a, and a locking portion 10b is formed at the right end of the adapter IO to lock it to the horizontal support frame 3.

(2) In the above embodiment, the lightning arrester 28 was located directly above the tension insulator 17, but it was located above the tension insulator 17,
In addition, the lightning arrester 28 is located at a position displaced forward or backward from the tip of the support arm 1, etc.
Displace horizontally. In this case, during maintenance and inspection of the tension insulator 17, the worker can easily move to the tension insulator 17, improving work efficiency. Since there is no contact with the lightning arrester 17, the stain resistance of the tension insulator 17 is improved.Furthermore, the insulation distance between the tower body and the lightning arrester 28 can be more easily ensured compared to the previous embodiment.

Effects of the Invention As described in detail above, the present invention can be easily applied to existing tension insulators, making it possible to simplify the construction work and to ensure that the tension insulators are resistant to shaking due to wind pressure, etc. This prevents undue stress concentration on the tension insulators, tower body side coupling fittings, and lightning arrester insulators, improves the durability of the equipment, maintains a stable installation condition, and prevents rainwater and snow caps on the support arm side from moving to the lightning arrester. By eliminating this, it is possible to improve the stain resistance of the lightning arrester insulator, which has an excellent effect of increasing reliability.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment embodying this invention;
Figure 2 is an enlarged exploded perspective view of the vicinity of the tip of the support arm, Figure 3 is an expanded exploded perspective view of the arc horn of the lightning arrester, and Figure 4 is an exploded perspective view of the arc horn of the lightning arrester.
The figure is a front view of the arc horn attached to the horn mounting bracket on the tower body side, FIG. 5 is a perspective view showing another example of the adapter, and FIG. 6 is a front view showing a conventional example. DESCRIPTION OF SYMBOLS 1... Support arm, 9... Mounting bracket, 1o... Adapter, 17... Tension-resistant insulator, 26... Electric wire, 28...
... Lightning arrester, 32... Arc horn as a discharge electrode on the charging side, 34... Arc horn as a discharge electrode of the lightning arrester, 35... Mounting plate, 36... Connection piece, 3
9...Bone, G2...Discharge gap.

Claims (1)

[Claims] 1. A tension insulator (17) is connected to the support arm (1) of the tower body via a tower body side connection fitting, and an electric wire side connection fitting is connected to the tension insulator (17). An electric wire (26) is installed through the support arm (1), and an adapter (26) is installed at the tip of the support arm (1).
A lightning arrester (28) is fixed in a cantilever manner so as to be located above the tension insulator (17) via the tension insulator (10);
A discharge electrode (32) on the power supply side is supported upward on the electric wire side connecting fitting, and a discharge electrode (34) attached to the tip of the lightning arrester (28) and a discharge electrode (32) on the power supply side are supported on the wire side connecting fitting. ) are opposed to each other with a predetermined air discharge gap (G2). 2 The discharge electrode (3) attached to the tip of the lightning arrester (28)
4) is a claim in which the length of the projection from the tip of the lightning arrester (28) is adjustable, and the lightning arrester (28) is rotatable in the vertical and horizontal directions with respect to the tip. The lightning horn insulator device according to item 1. 3. The adapter (10) is fixed to the tip of the support arm (1) using a bolt (8) that fixes the mounting bracket (9) to the support arm (1). The lightning-resistant horn insulator device described in . 4. The lightning horn insulator device according to claim 1, wherein the lightning arrester is displaced from a position directly above the tension insulator (17) to the front of the support arm (1).