JPS61260506A - Arresting insulator for aerial power transmission wire - 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 (Industrial Application Field) The present invention provides a method for quickly grounding a power transmission line when high voltage caused by a lightning strike is applied to the power transmission line, and also for reliably preventing follow-on arcs that occur thereafter. This invention relates to a lightning arrester device for overhead power transmission lines (suspension towers) that can shut off and prevent ground faults caused by lightning.

(Prior art) Generally, in a lightning arrester device in which a lightning arrester is installed in a power transmission line with a predetermined air discharge gap, the surface of the insulator may become soiled or wet with rainwater, resulting in the need for cleaning. Even under conditions where the surface leakage current of the lightning arrester is much more likely to increase, it is necessary to interrupt the follow-on arc in a short time.

To solve this problem, a lightning arrester insulator for overhead power transmission lines has been disclosed, for example, in Japanese Utility Model Application Publication No. 54-137838. This is shown in Figure 5,
A support insulator 36 for supporting a power transmission line 35 is suspended at its upper end from a support arm 34 of a steel tower 33 so as to be rotatable in the lateral direction.
A lightning arrester 38 is attached to the middle part of the support arm 34.
was suspended and fixed, and a ground-side discharge electrode 39 was horizontally cantilevered to the lower end of the lightning arrester 38.

(Problems to be Solved by the Invention) However, in the conventional overhead power transmission line lightning arrester device, since the lightning arrester 38 is directly attached to the lower part of the support arm 34,
Rainwater adhering to the arm 34 flows to the lightning arrester 38, and as a result, the discharge electrodes 37.3 on the energizing side and the grounding side are damaged by lightning.
When the lightning arrester was activated, the surface leakage current generated by the voltage to the ground increased dramatically, and a phenomenon occurred in which the follow-on arc could not be interrupted in the air discharge gap.

Additionally, there is a problem in that the snow on the steel tower tends to push toward the surge arrester 38, causing a flashover on the outer surface. In addition, power transmission 1m3
5, an arc is generated between both discharge electrodes 37 and 39, so there is a problem that the power transmission line 35 is easily fused.

In addition, the lightning arrester 38 is located inside the power transmission line 35 (the tower 33
side), it was necessary to significantly increase the protruding length of arm 2 to ensure the necessary insulation spacing for maintenance and inspection, and there was a problem in fitting it to the existing steel tower. .

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention suspends the hanging insulator of the power transmission line rotatably from the support arm of the tower body, and the lower end of the hanging insulator The discharge electrode on the energized side is extended in the direction of the line at a position displaced a predetermined distance upward from the power transmission line, and on the other hand,
A lightning arrester is suspended and fixed to the support arm via a mounting adapter so that the lightning arrester is displaced laterally in correspondence with the discharge electrode on the power-supplying side, and the mounting adapter is displaced upward from the lower surface of the support arm. The ground side discharge electrode supported on the lower electrode of the lightning arrester and the energized side discharge electrode are opposed to each other with a predetermined air discharge gap.

(Function) By adopting the above-mentioned means, the present invention functions as follows.

When an abnormally high voltage due to a lightning strike is applied to a power transmission line, the voltage is discharged from the charging side discharge electrode to the grounding side discharge electrode via the clamp fitting, and then passes through the nonlinear resistance element built into the lightning arrester. It flows towards the tower body side and is grounded. Further, the subsequent arc generated thereafter is blocked by the air discharge gap and the non-linear resistance element.

In the present invention, the lightning arrester is displaced to the side corresponding to the hanging insulator, and the upper part of the lightning arrester is located above the support arm, so rainwater does not concentrate on the discharge electrode. , the gap between the re-discharge electrodes is always kept constant and the discharge characteristics are stabilized. Further, the lightning arrester can be easily attached to the existing support arm using a mounting adapter, and the discharge electrode on the energizing side can also be easily attached using the existing horn mounting bracket.

(Embodiment) Hereinafter, an embodiment embodying the present invention will be described based on FIGS. 1 to 4. A hanging fitting 4 is fixed to the bottom surface of the tip of a support arm 2 of a steel tower 1 by a bolt 3. A connecting fitting 5 is connected to the hanging fitting 4 so as to be rotatable in the direction of the railway line (left and right in FIG. 1) and in a direction perpendicular to the railway direction. The suspension insulator chain 9, which is a hanging insulator made by connecting a large number of suspension insulators 8 in series, is connected to the horn mounting bracket 7 so as to be rotatable in the track direction. It is suspended.

A horn mounting bracket 1 is also provided at the lower end of the suspension insulator chain 9.
1 are connected to be rotatable in the track direction, and a connecting link 13 is connected to the lower end of the mounting bracket 11 via a pin 12 so as to be rotatable in the track direction. A power transmission line 15 is supported at the lower end of the connecting link 13 via a wire clamp 14 .

The two horn mounting brackets 7.11 are provided with arcing horns 16, 17 on the energizing side and the grounding side for capturing the arc that flashes across the surface of the suspended insulator chain 9 in the event of a lightning strike and preventing the insulator chain 9 from melting. is supported cantilevered. Further, a discharge electrode 18 on the energizing side is supported in a cantilever manner by the lower mounting bracket 11 so as to be located on the opposite side from the arching horn 16.

On the other hand, on one side of the support arm 2, there is a mounting adapter 19 in a planar shape located on the side of the arm 2.
is attached with a bolt 27, and a resistance element (path shown) with non-linear voltage-current characteristics is mounted on the bottom surface of the tip of the adapter 19.
An upper electrode 23 of a lightning arrester 20 with a built-in lightning arrester 20 is suspended and fixed by a bolt 28, and a lower electrode 21 located at the lower end of the lightning arrester 20 has an upper electrode 23 in a direction perpendicular to the line so as to face the discharge electrode 18 on the energized side. The ground side discharge electrode 2 has a width of
2 is attached facing downward.

The distance between the cap fitting 8a of the suspension insulator 8 located at the upper end of the suspension insulator chain 9 and the discharge electrode 18 on the energized side is equal to the discharge gap G between the discharge electrodes 18°22 on the energized side and the ground side. 1
．． It is set to 3 times or more.

This is to ensure that the discharge occurs in the discharge gap G even when there is sudden lightning. Further, the upper electrode 23 of the lightning arrester 20 is displaced a predetermined distance upward from the lower surface of the support arm 2 by bending the middle part of the mounting adapter 19 upward, and water droplets adhering to the support arm 2 are concentrated on the lightning arrester 20. This is to prevent the snow cap from approaching the lightning arrester 20.

FIG. 4 shows the installation state of the lightning arrester device on the entire left side of the steel tower 1. As is clear from this figure, the first lightning arrester 2OA is attached to the first support arm 24, the second support arm 25, and the third support arm 26 at the bottom.
The horizontal positional relationship of the second lightning arrester 20B and the third lightning arrester 20C is as follows. In other words, the first lightning arrester 20A is placed closest to the tower, and the second lightning arrester 20A is placed closest to the tower.
0B is located farthest from the steel tower, and the third lightning arrester 20C is located between the first and second lightning arresters 20A and 20B to prevent rainwater dripping from the upper lightning arrester from hitting the lower lightning arrester. There is.

Next, the operation of the lightning arrester device for overhead power transmission lines constructed as described above will be explained.

Now, when an abnormally high voltage due to a lightning strike is applied to the power transmission line 15, this voltage is applied to the wire clamp 14, the connecting link 13,
and the discharge electrode 18 on the power supply side via the horn mounting bracket 11.
It is discharged from the discharge electrode 22 on the ground side, further flows through the non-linear resistance element in the lightning arrester 20 to the mounting adapter 19, and is grounded via the support arm 2 and the steel tower 1. Thereafter, the generated follow-on arc is blocked by the air discharge gap and the non-linear resistance element, and the arc is prevented from fusing both discharge electrodes 18, 22.

Further, in this embodiment, since the tip of the discharge electrode 18 on the energizing side is formed horizontally, even if the suspension insulator chain 9 rotates in the line direction around the connecting fitting 5, both discharge electrodes 18. The discharge gap G of 22 is kept constant, and a stable column mounting state is maintained.

Furthermore, in the embodiment, the upper electrode 23 of the lightning arrester 20 is positioned above the lower surface of the support arm 2 by the mounting adapter 19, so rainwater on the support arm 2 side flows through the mounting adapter 19 to the lightning arrester 20. can be eliminated. Furthermore, since the lightning arrester 20 is displaced from the suspension insulator chain 9 in the direction of the railway line, it is possible to secure a sufficient air insulation gap between the lightning arrester 20 and the steel tower 1, and it can be attached to the existing steel tower 1 via the mounting adapter 19. The lightning arrester 20 can be easily attached. Furthermore, the discharge electrode 18 on the energizing side can be easily mounted using the horn mounting bracket 11.

Note that the present invention can also be embodied as follows.

(1) Instead of the suspension insulator chain 9, use a long stem insulator (as shown).

(2) The suspension insulator chain 9 or the long trunk insulator is used as a hanging insulator for a jumper line (as shown in the diagram). In this specification, when referring to a power transmission line, the jumper line is also included.

Effects of the Invention As described in detail above, the present invention allows a lightning arrester to be easily attached to an existing overhead power transmission line lightning arrester device by simply using a mounting adapter, and also enables the lightning arrester to be easily attached to an existing overhead power transmission line lightning arrester device by simply using a mounting adapter. The electrodes can also be easily attached using existing horn mounting brackets. Further, in the present invention, the lightning arrester is displaced in the direction of the railway line in correspondence with the hanging insulator, and the upper part of the lightning arrester is located above the support arm, so that rainwater adhering to the support arm is removed from the lightning arrester. It is possible to reduce the surface leakage current of the lightning arrester by preventing the snow cap from moving to the ground side discharge electrode or sticking out from the support arm side and attaching to the lightning arrester. Furthermore, since the discharge electrode on the energized side corresponds to the discharge electrode on the ground side above the power transmission line, it is possible to prevent the arc from touching the power transmission line during discharge, thereby preventing the transmission line from fusing. be.

[Brief explanation of the drawing]

FIG. 1 is a front view showing one embodiment of the present invention, and FIG. 2 is a front view showing one embodiment of the present invention.
3 is a plan view of FIG. 1, FIG. 4 is a front view of the road body showing one side of the entire steel tower, and FIG. 5 is a front view of a conventional example. DESCRIPTION OF SYMBOLS 1... Steel tower, 2... Support arm, 9... Suspension insulator chain, 11... Horn mounting bracket, 13... Connecting link, 14... Electric wire clamp, 14... Power transmission line, 16.
17...Arching horn, 18.22...Discharge electrode, 19...Mounting adapter, 20...Lightning arrester.

Claims (1)

[Claims] 1. A hanging insulator of a power transmission line is rotatably suspended from the support arm of the tower body, and a discharge electrode on the energized side is fixed from the power transmission line at the lower end of the hanging insulator. extending in the direction of the railway line at a position displaced a distance upward, while suspending and fixing the lightning arrester to the support arm via a mounting adapter so as to be displaced laterally in correspondence with the discharge electrode on the energized side; The mounting adapter is displaced upward from the lower surface of the support arm, and the discharge electrode supported on the lower electrode of the lightning arrester and the discharge electrode on the energized side are opposed to each other with a predetermined air discharge gap. Lightning arrester device for overhead power transmission lines. 2. According to claim 1, the distance between the discharge electrode on the energized side and the metal fitting on the tower body side of the hanging insulator is set to be 1.3 times or more the discharge gap between the two discharge electrodes. Lightning arrester device for overhead power transmission lines. 3. The lightning arrester device for an overhead power transmission line according to claim 1, wherein the discharge electrode on the energizing side is cantilever-supported by a horn mounting bracket attached to the lower end of the hanging insulator.