JPH0247803B2 - KAKUSODENSENYOHIRAIGAISHISOCHI - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) 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 landmine accidents caused by lightning.

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

In order 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. 137838/1983. As shown in FIG. 5, this applies to the support arm 34 of the steel tower 33.
A support insulator 36 for supporting the power transmission line 35 is hung at the upper end so as to be rotatable in the lateral direction, a discharge electrode 37 on the energized side is attached to the power transmission line 35, and A lightning arrester 38 was suspended and fixed to the lower end of the lightning arrester 38, and a ground-side discharge electrode 39 was fixed horizontally in a cantilevered manner.

(Problems to be Solved by the Invention) However, in the conventional lightning arrester device for overhead power transmission lines, since the lightning arrester 38 is directly attached to the lower part of the support arm 34, rainwater adhering to the arm 34 flows into the lightning arrester 38. For this reason, an arc flows between the discharge electrodes 37 and 39 on the energized side and the ground side due to a lightning strike, and when the arrester operates, the surface leakage current generated by the ground voltage increases extremely, and the air discharge gap A phenomenon occurred in which the follow-on arc could not be interrupted. Additionally, there is a problem in that the snow on the tower tends to push toward the surge arrester 38, causing flashovers on the outer surface. Furthermore, both discharge electrodes 37, 3 correspond to the power transmission line 35.
There was a problem in that the power transmission line 35 was easily fused because an arc was generated between the lines 35 and 9.

In addition, since the lightning arrester 38 is located inside the power transmission line 35 (on the tower 33 side), maintenance and
It was not possible to secure the insulation interval necessary for inspection, and it became necessary to significantly increase the protruding length of the arm 2, which caused problems in application to existing steel towers.

(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 extends in the direction of the line at a position displaced upward by a predetermined distance from the power transmission line, while the lightning arrester is attached to the support arm via a mounting adapter to correspond to the discharge electrode on the energized side. The lightning arrester is suspended and fixed so that the lightning arrester is displaced laterally, and the mounting adapter is displaced upward from the lower surface of the support arm to connect the ground side discharge electrode supported on the lower electrode of the lightning arrester and the energized side discharge electrode. A method is adopted in which the discharge electrodes are opposed to each other with a predetermined aerial discharge gap.

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

When an abnormally high voltage caused by 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 the nonlinear resistance element built into the lightning arrester is After that, it flows to the tower body side and is grounded. Furthermore, subsequent arcs are 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 both discharge electrodes is always maintained constant, and the discharge characteristics are stabilized. Further, the lightning arrester can be easily attached to a conventional support arm using a mounting adapter, and the discharge electrode on the energizing side can also be easily attached using an existing horn mounting bracket.

(Example) Hereinafter, an example embodying the present invention is shown in Figs.
To explain based on FIG. 4, a hanging metal fitting 4 is fixed to the bottom surface of the tip of the support arm 2 of the steel tower 1 with a bolt 3, and a connecting metal fitting 5 is attached to the hanging metal fitting 4 for the railway line (left and right in Fig. 1). A horn mounting bracket 7 is connected to the connecting bracket 5 so as to be rotatable in the direction perpendicular to the track direction and a direction perpendicular to the track direction, and a horn mounting bracket 7 is connected to the connecting bracket 5 by a pin 6 so as to be rotatable in the track direction. A suspension insulator chain 9, which is a hanging insulator formed by connecting insulators 8 in series, is suspended by a pin 10 so as to be rotatable in the track direction.

A horn mounting bracket 11 is also connected to the lower end of the suspension insulator chain 9 so as 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 wire clamp 1 is attached to the lower end of the connecting link 13 connected to the wire clamp 1.
A power transmission line 15 is supported via 4.

The horn mounting brackets 7 and 11 are provided with arcing horns 16 and 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 arcing horn 16.

On the other hand, a mounting adapter 19 having a planar L-shape is attached to one side of the support arm 2 by a bolt 27 so as to be located on the side of the arm 2, and on the lower surface of the tip of the adapter 19, The upper electrode 23 of the lightning arrester 20, which has a built-in resistance element (not shown) with non-linear voltage-current characteristics, is suspended and fixed by a bolt 28, and the lower electrode 21 located at the lower end of the lightning arrester 20 is charged with the voltage. A ground-side discharge electrode 22 having a width in the direction perpendicular to the line is attached downward so as to face the side discharge electrode 18 .

The distance L 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 distance L between the discharge electrode 18 on the energized side and the ground side,
It is set to be 1.3 times or more the discharge gap G of No. 22.
This is because even when a sudden lightning strike occurs, the discharge occurs reliably in the discharge gap G. Moreover, the lightning arrester 2
By bending the middle part of the mounting adapter 19 upward, the upper electrode 23 of 0 is displaced a predetermined distance upward from the lower surface of the support arm 2, preventing water droplets adhering to the support arm 2 from concentrating on the lightning arrester 20 or snow capping. This is to prevent it 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 support arm 24, the second support arm 25,
and a first lightning arrester 20A and a second lightning arrester 20 respectively attached to the third support arm 26 at the lowermost stage.
The horizontal positional relationship of B and the third lightning arrester 20C is as follows. That is, the first lightning arrester 20A is placed closest to the tower, the second lightning arrester 20B is placed furthest from the tower, and the third lightning arrester 20A is placed closest to the tower.
C 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.

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 passes through the wire clamp 14, the connecting link 13, and the horn fitting 11,
From the discharge electrode 18 on the power supply side to the discharge electrode 22 on the ground side
The electric current 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. after that,
The generated follow-on arc is interrupted by the air discharge gap and the non-linear resistance element, and the melting of both discharge electrodes 18 and 22 due to the arc is prevented.

Furthermore, in this embodiment, since the tip of the discharge electrode 18 on the energizing side is formed horizontally, the suspended insulator chain 9
Even if it rotates in the direction of the line about the connecting fitting 5, the discharge gap G between both discharge electrodes 18 and 22 is maintained constant, and a stable column mounting state is maintained.

Furthermore, in the embodiment described above, the upper electrode 23 of the lightning arrester 20 is positioned above the lower surface of the support arm 2 by means of the mounting adapter 19.
Rainwater from the side flows through the mounting adapter 19 and the lightning arrester 2
It is possible to eliminate the flow to 0. Furthermore, since the lightning arrester 20 is displaced from the suspension insulator chain 9 in the direction of the railway line, a sufficient air discharge gap between the lightning arrester 20 and the steel tower 1 can be ensured, 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) Long trunk insulator (not shown) in place of suspension insulator chain 9
to use.

(2) The suspension insulator chain 9 or the long-stem insulator is used as a suspension insulator for jumper wire (not shown). In this specification, when referring to power transmission lines, jumper wires are 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 the 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. 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, the surface leakage current of the lightning arrester can be reduced. 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 drawings]

Figure 1 is a front view showing one embodiment of the present invention, Figure 2 is a front view showing one embodiment of the present invention;
The figure is a right side view of Fig. 1, Fig. 3 is a plan view of Fig. 1, and Fig. 4 is a schematic front view showing one side of the tower.
FIG. 5 is a front view showing a conventional example. 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)

[Scope of Claims] 1. A suspension insulator for a power transmission line is rotatably suspended from a support arm of a tower body, and a discharge electrode on the energized side is placed at a predetermined distance from the power transmission line at the lower end of the suspension insulator. At the position displaced upward, the lightning arrester extends in the direction of the railway line, and on the other hand, the lightning arrester is suspended and fixed 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 adapter displaces the support arm upward from the lower surface, and connects the discharge electrode supported by the lower electrode of the lightning arrester and the discharge electrode on the energized side.
A lightning arrester device for an overhead power transmission line, characterized in that the lightning arrester devices face each other with a predetermined air discharge gap. 2. The distance between the discharge electrode on the energized side and the metal fitting on the tower body side of the hanging insulator is equal to the discharge gap between the two discharge electrodes.
The first claim set at 1.3 times or more
Lightning arrester device for overhead power transmission lines as described in 2. 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.