JPH0242021Y2 - - Google Patents

Description

[Detailed explanation of the invention] Purpose of the invention (industrial application field) The invention is designed to quickly discharge high voltage caused by lightning to the earth when it is applied to power transmission lines, and to continue discharging it even under polluted conditions. This invention relates to a lightning arrester device for overhead power transmission lines (tension towers) that can interrupt currents.

(Prior art) In general, in a lightning arrester device in which a lightning arrester is installed with a predetermined air discharge gap to a power transmission line, the surface of the insulator is often 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 the surface of the insulator is clean, it is necessary to interrupt the follow-on current in a short time after the lightning arrester is activated by a lightning strike.

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. 6, 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 insulator 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. As a result, lightning strikes cause the discharge electrodes 37, 39 on the power supply side and the ground side to deteriorate.
When the lightning arrester operates due to a flashover between the two, the surface leakage current generated by the ground voltage increases dramatically.
A phenomenon occurred in which the follow-on arc could not be interrupted in the air discharge gap. In addition, the snow cap on the steel tower caused lightning arrester 38
There was a problem in that the outer surface was prone to flashing due to the protrusion. Furthermore, since there is a discharge electrode 39 between the power transmission line 35 and the lower arm, there is a problem that insulation clearance between the arms cannot be secured, and the arm needs to be modified.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention fixes a jumper wire support insulator for holding the jumper wires hanging from the support arm of the tower body, and attaches the jumper wire support insulator to the support arm of the tower body below the support arm. A lightning arrester is erected and fixed on another support arm located in correspondence with the jumper wire support insulator, and a cap metal fitting fitted to the lower end of the jumper wire support insulator is connected to a charge-controlled discharge via a mounting band. The electrode is extended laterally and the discharge end is directed downward, and the ground side discharge electrode supported on the upper electrode of the lightning protection insulator and the energized side discharge electrode are connected at a predetermined aerial discharge interval. The company has adopted the method of confronting the government with the following.

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

When high voltage caused by a lightning strike flows through the jumper wire, the voltage is discharged from the charging side discharge electrode to the grounding side discharge electrode via the clamp fitting and cap fitting, and the nonlinear resistance built into the lightning arrester insulator. It flows through the element to 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.

During the discharge, the arc is moved to the side of the jumper wire by the discharge electrode on the energized side, so that the jumper wire is not affected by heat due to the arc, and melting of the jumper wire is prevented. In addition, since the discharge electrode on the energized side is displaced to the side of the jumper wire support insulator, rainwater does not concentrate on the discharge electrode.
The gap between both discharge electrodes is always maintained constant, and the discharge characteristics are stabilized. Furthermore, the discharge electrode on the energizing side can be easily attached to the existing cap fitting using the attachment band.

(Example) Below, an example embodying the present invention is shown in Figure 1~
To explain based on FIG. 5, one end of a pair of left and right tension insulators 3 and 4 is connected to the tip of the support arm 2 of the steel tower 1, and wires are sent to both tension insulators 3 and 4 via an electric wire clamp 5. Electric wires 6 are connected. Further, the power transmission line 6 is connected by a jumper wire 7 supported by the wire clamp 5.

A jumper wire support insulator 9 made of a long insulator is suspended and fixed on the lower surface of the tip of the support arm 2 by a mounting plate 8, and on the lower surface of a lower cap fitting 10 fitted and fixed to the lower end of the support insulator 9, A wire clamp 11 is attached, and the central portion of the jumper wire 7 is held by the clamp. As shown in FIG. 4, a mounting band 14 consisting of two arc-shaped fastening pieces 12 and 13 is fastened to the engagement protrusion 10a of the cap fitting 10 with a bolt 15. On the side, a discharge electrode 16 on the power supply side having a horizontal L-shape is supported in a downward cantilever manner.
As shown in FIG. 3, this discharge electrode 16 rises upward from the mounting band 14, and by making the middle part horizontal, rainwater collected on the support insulator 9 is prevented from concentrating on the tip of the discharge electrode 16. I have to. Note that the arm 1 is attached to the mounting band 14.
The arcing horn 18 on the power supply side is supported by 7 so as to surround the support insulator 9, and correspondingly, the engagement protrusion 19 of the upper cap metal fitting 19
A also has a mounting band 2 similar to the mounting band 14 described above.
0 supports the arcing horn 21 on the grounding side. And both arching horns 18,2
1 makes it possible to capture arcs caused by contamination, flashing, etc. on the insulator surface.

On the other hand, in the lowermost phase of the steel tower 1, a mounting adapter 2 is installed so as to be located below the support arm 2.
2 is attached, and on the top surface of the tip of the adapter 22,
A lightning arrester 23 containing a built-in resistance element (not shown) with non-linear voltage-current characteristics is fixed upright, and an upper electrode 24 located at the upper end of the lightning arrester 23 is connected to the discharge electrode 16 on the power supply side. A ground-side discharge electrode 25 having a horizontal L-shape is attached facing upward.

The positional relationship between the discharge electrodes 16 and 25 on the power supply side and the ground side is slightly displaced in the horizontal direction so that water droplets falling from the discharge electrode 16 do not drip onto the discharge electrode 25.

FIG. 5 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 section between the first support arm 26 and the second support arm 27 at the top, the second section between the second support arm 26 and the third support arm 28 at the bottom, and the second section between the second support arm 26 and the third support arm 28 at the bottom, The horizontal positional relationship of the two discharge electrodes 16 and 25 respectively attached to the third section of the three support arms 28 and the attachment adapter 22 is as follows. That is, in the first section, the lightning arrester 25 is on the outside, in the second section, the lightning arrester 25 is on the inside, and in the third section, where the arm protrusion length is generally the shortest, the lightning arrester 25 is placed at the same position as the jumper wire support insulator 9 or slightly. It is located outside.

In addition, in order to ensure the clearance required by workers for maintenance and inspection, that is, a safe distance, the lightning arrester 25 in the third section closest to the tower 1 is placed outside the installation position of the jumper wire 7. is desirable.

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

Now, when a high voltage caused by a lightning strike is applied to the power transmission line 6, this voltage passes from the jumper wire 7 through the wire clamp 11 and the lower cap fitting 10.
From the discharge electrode 16 on the energized side to the discharge electrode 25 on the ground side
further flows to the mounting adapter 22 through the non-linear resistance element in the lightning arrester 23, and then to the tower 1.
It is grounded through. Thereafter, the generated follow-on arc is interrupted by the air discharge gap and the non-linear resistance element.

Furthermore, in this embodiment, the support insulator 9 and the lightning arrester 2
3 are both fixed by the support arm 2 and the mounting adapter 22, so both discharge electrodes 16, 25
The discharge gap is maintained constant, and a stable column mounting condition is maintained.

Furthermore, in the embodiment, the discharge electrode 26 on the power supply side
Since the base end of the discharge electrode 16 is raised upward, it is possible to prevent rainwater from concentrating on the discharge end of the discharge electrode 16, and also to prevent rainwater from concentrating on the discharge end of the discharge electrode 16, 25.
Since the horizontal position of the discharge electrode 16 is slightly displaced, rainwater dripping from the discharge electrode 16 on the power supply side does not hit the discharge electrode 25 on the ground side, and therefore the discharge characteristics can be stabilized.

Effects of the invention As detailed above, the present invention allows the discharge electrode on the energized side to be easily attached to the existing lightning arrester insulator for overhead power transmission lines, and also prevents rainwater from entering the discharge electrode on the energized side. By eliminating concentration, the discharge gap between the same discharge electrode and the ground discharge electrode can be stabilized, and furthermore, the arc that occurs when the lightning arrester cannot block the following current for some reason can be separated from the jumper wire to the side. This has the effect of preventing the jumper wire from fusing.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
The figure is a right side view of Fig. 1, and Fig. 3 is an enlarged sectional view showing the discharge electrode and arcing ring attached to the upper and lower cap fittings of the jumper wire support insulator,
FIG. 4 is an enlarged perspective view of the mounting band, FIG. 5 is a front view showing one side of the entire steel tower, and FIG. 6 is a front view showing a conventional example. 1... Steel tower, 2... Support arm, 6... Power transmission line, 7... Jumper wire, 9... Support insulator, 10
...Lower cap metal fitting, 12, 13...Tightening piece,
14...Mounting band, 16...Discharge electrode on power supply side, 22...Mounting adapter, 23...Lightning arrester,
25...Discharge electrode on the ground side.

Claims (1)

[Claims for Utility Model Registration] 1. A jumper wire support insulator for holding the jumper wire is suspended and fixed to a support arm of the tower body, and another support arm located below the support arm is provided with the jumper wire support insulator. A lightning arrester is erected and fixed in correspondence with the insulator, and a discharge electrode on the energized side is extended laterally through a mounting band to the cap fitting fitted to the lower end of the jumper wire support insulator, and the discharge end directing the part downwards,
A lightning arrester device for an overhead power transmission line, characterized in that a ground-side discharge electrode supported on the upper electrode of the lightning arrester and the energized-side discharge electrode face each other with a predetermined aerial discharge gap. 2. The lightning arrester device for an overhead power transmission line according to claim 1, wherein the energizing side discharge electrode is displaced upward at the base end portion fixed to the mounting band. 3. The mounting band is formed by a pair of substantially arc-shaped mounting pieces that are tightened by bolts to the engagement protrusions formed on the outer peripheral edge of the base end of the skirt portion of the cap metal fitting. The lightning arrester device for overhead power transmission lines according to item 1.