JPH0586609B2 - - Google Patents

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, there has been a device disclosed in Japanese Utility Model Publication No. 47-368, for example, as a device for installing a lightning arrester insulator with a predetermined air discharge gap to a power transmission line.

As shown in FIG. 6, this device fixes a tension-resistant insulator 47 that supports an electric wire 46 to a tower body 45, and connects a valve resistance element ( A lightning arrester 49 encapsulating a non-linear resistance element (non-linear resistance element) is integrally formed, and an electrode 50 provided at the tip of the same tension-resistant insulator 47 and an electrode 51 provided at the tip of the lightning arrester 49 are connected in the air. They were configured to face each other with a discharge gap G between them.

(Problems to be Solved by the Invention) However, the above-mentioned conventional device uses a tension-resistant insulator 4
Since the base end of the lightning arrester 7 and the base end of the support fitting 48 were integrally formed, it was difficult to attach the lightning arrester 49 using the existing tension-resistant insulator 47 and construct the device. . Furthermore, there is a problem in that stress concentration occurs in the tension-resistant insulator 47 and the support fitting 48 due to the bending moment due to the dead weight of the lightning arrester 49, resulting in a decrease in the mechanical strength of the device.

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 a tension-resistant insulator to a support arm of a tower body via a tower-side connecting fitting, and An electric wire is installed on the insulator via a wire-side connecting fitting, and a lightning arrester is connected to the tip of the support arm via an adapter so that the lightning arrester is positioned above the tension insulator so that the tip thereof faces upward. The projecting length of the discharge electrode attached to the tip of the lightning arrester can be adjusted, and the discharge electrode on the energized side is attached to the connecting fitting on the wire side so that the discharge electrode faces diagonally upward. A configuration is adopted in which a discharge electrode attached to the tip of the lightning arrester and the discharge electrode on the energized side face each other with a predetermined air discharge gap.

(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 unreasonable stress concentration does not occur in the tower side connecting fittings, adapters, lightning arrester, and tension insulator.

Further, snow caps and rainwater on the support arm will not migrate 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 through an adapter, and no special mounting hardware is required other than the adapter.

(Example) Hereinafter, one embodiment of the present invention will be described in the first to
This will be explained in detail based on FIG.

As shown in FIG. 2, the support arm 1 of the tower body is
A pair of left and right horizontal support frames 2 and 3, a connecting plate 5 interposed between the tips of the horizontal support frames 2 and 3 and fixed by bolts 4 and nuts 4a, and a bolt 6 connected to the connecting plate 5. , and an inclined frame 7 connected by nuts 6a, and a tension-resistant insulator mounting bracket 9 fixed to the bottom surfaces of the ends of the horizontal support frames 2 and 3 by bolts 8 and nuts 8a. The bolts 8 are short enough to connect the support frames 2, 3 and the mounting fittings 9 in the existing tower body, but in this embodiment, the existing short bolts are used in the installed state. Replace them one by one with longer bolts 8, then replace the same bolts 8 to 8.
An adapter 10 for attaching a lightning arrester 28, which will be described later, is attached using a nut 8b using the upper end of the lightning arrester 28.

Next, a pair of tension 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. Said U clevis 12
A tower side horn mounting bracket 13 is connected to the shaft 14 so as to be relatively rotatable in the vertical direction, and one end of the bracket 13 is connected through a ball clevis 16 which is connected to the shaft 15 so as to be relatively rotatable in the vertical direction. A tension insulator 17 is connected to the tension insulator 17. In this embodiment, the above-described U clevises 11 and 12, the tower-side horn mounting fitting 13, and the ball clevis 16 constitute a tower-side connecting fitting.

A wire-side horn mounting bracket 19 is connected to the power supply side end of the tension insulator 17 via a socket clevis 18 by a shaft 20 so as to be relatively rotatable in the vertical direction. One end of the horn mounting bracket 19 has a shaft 2.
A parallel clevis link 22 is connected to the clevis link 22 so as to be relatively rotatable in the vertical direction by a shaft 23, and a connecting link 24 is connected to the clevis link 22 to be relatively rotatable in the vertical direction by a shaft 23. An electric wire 26 is supported via 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 mounting bracket 19, parallel clevis link 22, and connecting link 2 are used.
4 and the wire clamp 25 constitute a wire side connection fitting.

On the other hand, the adapter 10 has a swash plate 10a which has a cross-sectional shape, and the swash plate 10a has a lightning arrester 28 having a built-in resistor element with non-linear voltage-current characteristics so that the tip thereof faces upward. It is cantilevered and fixed diagonally. This lightning arrester 28 is located in a vertical plane passing through the central axis of the tension insulator 17.

As shown in FIG.
(degree of inclination angle) A pair of arc horns 29, 29 are fixed by bolts 31 via mounting pieces 30.

The electric wire side horn mounting bracket 19 has an arc horn 32 extending diagonally upward and serving as a discharge electrode on the power supply side.
is fixed by a bolt 33 and faces the arc horns 29, 29 with a predetermined air discharge gap G1.

Further, an arc horn 34 serving as a discharge electrode is attached to the tip of the lightning arrester 28. As shown in FIG. 3, the arc horn 34 includes a mounting plate 35 that is attached to the tip protrusion 28a of the lightning arrester 28 by bolts, and a protruding length adjustable from the mounting plate 35. The long holes 35a and 36a are made to correspond to each other so that the rotational position in the vertical direction can be adjusted, and the rotational position in the horizontal direction can be adjusted with respect to the connecting piece 36 attached by the bolt 37 and the nut 37a. It is composed of a bolt 38 and a horn 39 secured by a nut 38a. It faces the arc horn 32 with a predetermined aerial discharge gap G2. The arc horn 32 is commonly used as a discharge electrode on the energizing side for the arc horns 29 and 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 due to a lightning strike is applied to the electric wire 26, the current at this time flows through the arc horn 32.
It is discharged in the air discharge gap G2 properly maintained between the arc horn 34 and the arc horn 34, and flows to the support arm 1 of the tower body through a non-linear resistance element built in the lightning arrester 28. 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 the like and an arc occurs along the surface of the tension insulator 17, the arc horn 32,
The arc is generated in the air discharge gap G1 between the 29 and 29, thereby preventing the tension insulator 17 from burning out and preventing the arc from propagating to the tower body.

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, and therefore the range of application is expanded and it is very practical.

In addition, when the electric wire 26 is mounted on a pole, shaking due to wind pressure or the like acts on the electric wire 26, causing the tension insulator 17 to become attached to the U clevis 12.
Even if the lightning arrester 28 is rotated around , it has no effect on the lightning arrester 28, and therefore, there is no unreasonable stress concentration on the tension insulator 17, the tower side connecting fittings, and the lightning arrester 28.
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 will not move to the lightning arrester 28. Therefore, the stain resistance of the lightning arrester 28 is improved, and the discharge gap G2 between the arc horns 32 and 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 nut 8a, and a locking portion 10b is formed at the right end of the adapter 10 to lock it to the horizontal support frame 3.

(2) In the above embodiment, the lightning arrester 28 is replaced by the tension insulator 17.
However, the lightning arrester 28 is positioned directly above the tension insulator 17, and the lightning arrester 28 is positioned at a position displaced forward or backward from the tip of the support arm 1, for example, in a horizontal direction. To be displaced. In this case, when performing maintenance and inspection of the tension insulator 17, the worker can easily move to the tension insulator 17, improving work efficiency.
When rainwater or snow falls, it does not hit the tension insulator 17, so 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 detailed above, the present invention does not require any mounting hardware other than an adapter and can be easily applied to an existing tension insulator device. Even when the tension insulator shakes, unreasonable stress concentration does not occur on the tension insulator, the tower side connecting fittings, and the lightning arrester, improving the durability of the equipment, maintaining a stable erection state, and further preventing rainwater from forming on the support arm side. It is possible to improve the anti-fouling property of the lightning arrester by eliminating the movement of rain and snow caps onto the lightning arrester.
Furthermore, since the air discharge gap can be adjusted, reliability can be improved.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment embodying the present invention, FIG. 2 is an enlarged exploded perspective view of the vicinity of the tip of the support arm, FIG. 3 is an enlarged exploded perspective view of the arc horn of the lightning arrester, and FIG. FIG. 4 is a front view of the arc horn attached to the tower side horn mounting bracket, FIG. 5 is a perspective view showing another example of the adapter, and FIG. 6 is a front view showing a conventional example. 1...Support arm, 9...Mounting bracket, 10...
Adapter, 17... Tension insulator, 26... Electric wire, 2
8... 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...
...Connecting piece, 39...Horn, G2...Discharge gap.

Claims (1)

[Scope of Claims] 1. A tension insulator 17 is connected to the support arm 1 of the tower body via a tower side connecting fitting, and an electric wire 26 is installed to the tension insulator 17 via an electric wire side connecting fitting. , a lightning arrester 28 is cantilever-fixed to the tip of the support arm 1 via an adapter 10 so as to be positioned above the tension insulator 17 with the tip facing upward; , the lightning arrester 2
The protruding length of the discharge electrode 34 attached to the tip of the electric wire 8 can be adjusted, and the electric wire side connecting fitting supports the discharge electrode 32 on the energizing side diagonally upward;
A discharge electrode 3 attached to the tip of the lightning arrester 28
4 and the discharge electrode 32 on the energizing side are opposed to each other with a predetermined aerial discharge gap G2. 2 The adapter 10 has a cross-sectional shape, and has a bolt 8 that fixes the mounting bracket 9 to the support arm 1.
The lightning horn insulator device according to claim 1, wherein the lightning horn insulator device is fixed to the tip of the support arm 1 by using.