JPH01163927A - Discharge electrode in lightening insulator device - Google Patents

Abstract

PURPOSE:To realize a light weight of a whole discharge electrode by composing almost all the electrode except an installing member and a discharge end with a connection body consisting of a high strength of high polymer material. CONSTITUTION:A discharge electrode 22 is composed of an installing member 23, a connection material 24 consisting of a high strength of high polymer engaged to an installing projection 23a formed projecting integrally with the member 23, a discharge end 25 engaged and fixed to the tip of the connection material 24, and a lead wire 26 inserted in the connection material 24 and connecting the projection 23a and the end 25 electrically. And, inside the connection material 24, an insulating filler 27 to prevent a corona discharge, such as a compound or a foamy insulator, is filled. Furthermore, on the outer surface of the connection material 24, a weather-proof type insulating coverage 28 is furnished. Since the connection material is formed of a high strength of high polymer material in such a composition, the electrode is made in a light weight, and the transport and the installation to an iron tower is made easier.

Description

[Detailed Description of the Invention] Purpose of the Invention (Industrial Field of Application) The present invention provides a method for detecting abnormally large currents flowing through power transmission lines due to lightning strikes.
The present invention relates to a discharge electrode in a lightning arrester device that can quickly discharge lightning to the ground through its protection function, suppress and cut off follow-on current, and prevent permanent ground faults.

(Prior Art) Conventionally, in a lightning arrester device for a power transmission line, a lightning arrester is suspended and fixed to a support arm of a steel tower using a mounting adapter, and an electrode fitting on the energized side provided at the lower end of the lightning arrester is attached to the support arm of a steel tower. A horn-shaped grounding side discharge electrode is provided, and a horn-shaped discharge electrode on the power supply side made of steel is provided on the power transmission line side, for example, on the wire hanging wire. An air discharge gap is formed with an insulation strength that can withstand frequency voltages and switching surge voltages. When a lightning surge enters the power transmission line, the surge current flashes through the air discharge gap and flows through the current limiting element with non-linear voltage-current characteristics housed inside the lightning arrester, causing the surge current to flow through the support arm. and is discharged via the steel tower.

(Problems to be Solved by the Invention) The discharge electrode on the energizing side was made entirely of steel material in terms of short-circuit strength and mechanical strength.
For 75KV, the length is 2.5m, the diameter is about 401m, and the weight is about 40kg, which not only makes it troublesome to transport in mountainous areas, but also requires more than one person to install it on the tower. There were problems such as difficulty in

Also, if the discharge electrode is heavy, the power transmission line support insulator device will become unbalanced, so to prevent this, a power transmission line support insulator located on the side opposite to the discharge electrode of the horn mounting bracket on the power supply side is installed. The weight of the arcing horn to prevent creeping flash is increased for reasons of balance. As a result, the weight of the entire support insulator device increases, and when the power transmission line swings due to wind pressure, etc., the inertia of the lower end of the support insulator increases, making the power transmission line prone to swaying sideways for a long period of time. There was a problem in securing insulation clearance between the steel tower and the steel tower.

An object of the present invention is to provide a lightning arrester which can reduce the weight of a discharge electrode attached to a power transmission line, making it easy to transport and install, and which can suppress swinging of a power transmission line in the installed state. An object of the present invention is to provide a discharge electrode in a device.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a mounting member attached to the horn mounting bracket on the power supply side and a discharge end portion facing the discharge electrode on the ground side. These are connected by a connecting member made of a high-strength polymer material, and the mounting member and the discharge end are electrically connected by a lead wire inserted through the connecting member.

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

Since the discharge electrode of the present invention is almost entirely composed of a connecting material made of high-strength polymer material, except for the mounting member and the discharge end, the entire discharge electrode is lightweight, and as a result, it is easy to transport and attach to the steel tower. Installation work becomes easier. In addition, even if the power transmission line swings with the discharge electrode attached to the lower end of the power transmission line support insulator device, since the discharge electrode is lightweight, the arcing horn that balances the discharge electrode can also be made lighter. , the entire weight acting on the lower end of the support insulator of the power transmission line is reduced, the inertia force is reduced, and the swing angle of the support insulator is reduced.
Moreover, the swing time is shortened and the discharge characteristics are stabilized. In addition, since the lead wire is covered with a connecting material and an insulating filler, the corona discharge starting voltage increases, improving corona characteristics.
The diameter can be made smaller accordingly.

(Example) Hereinafter, an example embodying the present invention will be described based on FIGS. 1 to 3.

As shown in FIG. 3, a connecting fitting 2 is fixed to the tip of the support arm 1 of the steel tower, and a suspension insulator 5 is connected in series to the connecting fitting 2 via a U clevis link 3 and a horn fitting 4. A suspension insulator chain 6, which serves as a support insulator, is supported so as to be swingable in the line direction and in the orthogonal direction. A wire clamp 10 for supporting a power transmission line 9 is supported by a horn fitting 7 at the lower end of the suspension insulator chain 6 via a connecting link 8. A suspension insulator chain 6 is attached to the horn mounting brackets 4 and 7.
Arcing horns 11 and 12 are installed to reduce damage caused by creeping flash as much as possible.

A mounting adapter 13 is fixed to the tip of the support arm 1 with a bolt, and a first mounting adapter 13 is fixed to the tip of the support arm 1 with a bolt.
A lightning arrester 14 is suspended and fixed by an electrode fitting 15 on the ground side. Further, the lower end of the first lightning arrester 14,
In other words, the second lightning arrester 17 is attached to the electrode fitting 16 on the power supply side.
The electrode fitting 15 on the ground side is fixed with a bolt. Furthermore, the grounding side electrode fitting 15 of the third lightning arrester 18 is fixed to the power supply side electrode fitting 16 located at the lower end of the second lightning arrester 17 with a bolt.

The first to third lightning arresters 14, 17, 18 are made of a voltage-resistant insulating tube (shown in the figure) formed in a cylindrical shape from a tensile material such as FRP, and a zinc oxide (ZnO) tube housed in series therein.
) with nonlinear voltage-current characteristics (
(path shown in the figure) and cap-shaped electrode fittings 16.15 on the power-supplying side and the grounding side that are fitted and fixed to both ends of the voltage-resistant insulating tube.
and a rubber mold 19 provided on the outer periphery of the voltage-resistant insulating tube.
It is integrally formed with.

Incidentally, an arcing ring 20 is attached to each of the electrode fittings 15 and 16 by a support arm (not shown) in order to reduce damage to the rubber mold 19 during creeping flash. The electrode fitting 16 of the third lightning arrester 18 includes:
A discharge electrode 21 on the ground side is attached.

On the other hand, the horn mounting bracket 7 in the energizing example supports a energizing side discharge electrode 22 that faces the grounding side discharge electrode 21 and forms a predetermined aerial discharge gap G. As shown in FIG. 1, this discharge electrode 22 is attached to a mounting member 2 that is attached to the horn mounting bracket 7 on the energizing side with a bolt.
3, and a connecting member 2 made of a high-strength polymer material fitted into a mounting protrusion 23a integrally formed on the mounting mounting member 23.
4, and a discharge end 25 that is fitted and fixed to the tip of the connecting member 24, and is inserted into the connecting member 24 and electrically connects the mounting protrusion 23a and the discharge end 25. It is composed of a lead wire 26. Further, the inside of the connecting member 24 is filled with an insulating filler 27 such as a compound or a foam insulating material to prevent corona discharge.

Insulating filler 2 depending on the need for functionality or strength
7 may be omitted, and the connecting member 24 may be integrally formed of a high-strength polymer material. The thickness of the lead wire 26 may be such that it has a cross-sectional area sufficient to conduct a lightning surge current, or if an earth current should be taken into consideration, a cross-sectional area corresponding to this.

Furthermore, the outer surface of the connecting member 24 is coated with a weather-resistant insulating coating 28 such as fluororesin, silicone rubber, or EPDM rubber.
is provided. The distal end portion of this weather-resistant insulating coating 28 covers the outer peripheral surface of the proximal end of the discharge end portion 25 .

The tip of this discharge end portion 25 is formed into a hemispherical shape, and is designed to relax the electric field.

On the other hand, since the discharge electrode 21 is formed in an arc shape, the discharge gap G remains almost constant even if the suspended insulator chain 6 swings in the direction perpendicular to the line in FIG. I'm trying to keep it.

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

Now, when a large current is applied to the power transmission line 9 due to a lightning strike, this current is transferred to the wire clamp 10. A discharge is discharged from the discharge electrode 22 through the discharge gap G to the discharge electrode 21, flows from the electrode fitting 16 to the current limiting element (path shown) of the third lightning arrester 18, and then flows to the electrode fittings 15, 16, the second and third lightning arrester. It flows to the support arm 1 through the current limiting elements (paths shown) of the insulators 17 and 18, the electrode fittings 15 and 16, and the mounting adapter 13, and further flows to the steel tower and is discharged to the earth. Subsequent currents that occur thereafter are suppressed and blocked by the current limiting element.

Now, in the embodiment of the present invention, as shown in FIGS. 1 and 2, the connecting material 24 that becomes the main body of the discharge electrode 21 is formed of a high-strength polymer material, so that the discharge electrode 21 is reduced in weight.
As a result, the discharge electrode 21 can be easily transported and attached to the steel tower.

Moreover, when the discharge electrode 21 is made lighter, this discharge electrode 21
The weight of the arching horn 12 that balances the power transmission line 9 is also reduced, and the weight of the hanging load acting on the lower end of the suspension insulator chain 6 is reduced, so that when the power transmission line 9 sways due to wind pressure, etc., the inertial force is small (less As a result, the rolling angle becomes smaller and the tower is immediately restored to its original resting position, making it unnecessary to design the insulation clearance between the power transmission vA9 and the steel tower so strictly.

Note that the present invention is not limited to the above embodiments,
It can also be specified as follows.

As shown in FIG. 4, a discharge end 25 is connected to the tips of two connecting members 24 to form the entire discharge electrode 21 into a hairpin shape.

Effects of the Invention As detailed above, in this invention, the entire discharge electrode, except for the mounting member and the discharge end, is composed of a connecting material made of a high-strength polymer material. Transporting the results and attaching them to the steel tower can be carried out easily. In addition, even if the power transmission line swings with the discharge electrode attached to the lower end of the power transmission line support insulator device, since the discharge electrode is lightweight, the arcing horn used to balance the discharge electrode is also lightweight. This reduces the overall weight of the lower end of the support insulator of the transmission line, reduces the inertia, reduces the swing angle of the support insulator, shortens the swing time (and stabilizes the discharge characteristics in the pole-mounted state). There is an effect that can be done.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of the central part showing an embodiment of a discharge electrode embodying the present invention, FIG. 2 is an enlarged cross-sectional view of FIG. 1, and FIG. 3 is a front view showing the entire lightning arrester device. FIG. 4 is a perspective view of main parts separately showing the present invention. DESCRIPTION OF SYMBOLS 1... Support arm, 6... Suspension insulator chain, 9... Power transmission line, 13... Mounting adapter, 14... First lightning arrester, 15... Ground side electrode fitting, 16 ...Electrode fitting on the charging side, 17...Second lightning arrester, 18...Third lightning arrester, 19...Rubber mold, 21...Discharge electrode on the grounding side, 22...・Discharge electrode on the charging side, 23・
... Mounting member, 23a... Mounting protrusion, 24... Connecting material, 25... Discharge end, 26... Lead wire, 27...
...Insulating filler, 28...Weather-resistant insulation coating.

Claims (4)

[Claims] 1. The mounting member attached to the horn mounting bracket on the power supply side and the discharge end facing the discharge electrode on the grounding side are connected by a connecting member made of a high-strength polymer material, and the mounting member and the discharge end are connected. A discharge electrode in a lightning arrester device, characterized in that the discharge electrode is electrically connected by a lead wire inserted through a connecting member. 2. The discharge electrode in the lightning arrester device according to claim 1, wherein the surface of the connecting member has a weather-resistant insulating coating. 3. 2. The discharge electrode in a lightning arrester device according to claim 1, wherein the connecting member is hollow and has an insulating filling material such as a silicon compound or a foamed insulating material therein. 4. The discharge electrode in a lightning arrester device according to claim 1, wherein the connecting member is solid.