JP2548251B2 - Discharge electrode in lightning arrester device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention, when an abnormally large current flows through a power transmission line due to lightning, discharges it rapidly to the ground by a lightning protection function and suppresses follow-up current. The present invention relates to a discharge electrode in a lightning arrester device capable of blocking and preventing a permanent ground fault.

(Prior art) Conventionally, a lightning arrester device for a power transmission line has a lightning arrestor suspended and fixed by a mounting adapter to a support arm of a steel tower, and an electrode metal fitting on a power-supply side provided at a lower end portion of the lightning arrester has a A horn-shaped discharge electrode on the ground side is provided.On the other hand, a discharge electrode on the power transmission side, for example, a wire-hanging metal fitting, is also provided with a horn-shaped steel material on the power-supply side. The air discharge gap is set to have an insulation strength that can withstand the voltage and the switching surge voltage. And
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 having a non-linear voltage-current characteristic housed inside the lightning arrestor, and the supporting arm and the steel tower. Is discharged through.

(Problems to be solved by the invention) Since the discharge electrode on the voltage applying side is entirely formed of steel from the viewpoint of short-circuit strength and mechanical strength, for example, the voltage class is
For 275 KV, the length is 2.5 m, the diameter is about 40 mm, it is large, the weight is about 40 kg, and it is not only troublesome to transport in the mountainous area, but also it is necessary for multiple people to install it on the tower. There were problems such as difficulty.

In addition, if the discharge electrode is heavy, the support insulator device for the transmission line becomes unbalanced.To prevent this, the support insulator for the discharge line located on the opposite side of the discharge electrode of the horn mounting bracket on the power supply side The arcing horn for preventing the surface flashover has been made heavy for reasons of balance. Therefore, the weight of the entire support insulator device becomes large, and when the power transmission line swings due to wind pressure or the like, the inertia of the lower end of the support insulator becomes large, and the power transmission line easily rolls over a long period of time. It was a problem in securing the insulation clearance between the tower and the steel tower.

An object of the present invention is to reduce the weight of the discharge electrode attached to the power transmission line side, facilitate the transportation and mounting, and suppress the swing of the power transmission line in the mounted state. It is to provide a discharge electrode in the device.

Structure of the Invention (Means for Solving the Problems) In order to solve the above problems, the present invention has a discharge member facing the discharge member on the grounding side and a mounting member mounted on the horn mounting metal fitting on the charging side. Is 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 in the connecting member.

(Operation) The present invention operates as follows by adopting the above means.

The discharge electrode of the present invention, except for the mounting member and the discharge end, is almost entirely composed of a connecting material made of a high-strength polymer material. The mounting work becomes easy. 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, the discharge electrode is lightweight, so the arcing horn for balancing with this discharge electrode is also lightweight. ,
The weight acting on the lower end of the support insulator of the power transmission line is reduced, the inertial force is reduced, the swing angle of the support insulator is reduced, the swing time is shortened, and the discharge characteristics are stabilized.
Further, since the lead wire is covered with the connecting material and the insulating filler, the corona discharge starting voltage is increased, the corona characteristics are improved, and the diameter can be reduced accordingly.

(Embodiment) An embodiment embodying the present invention will be described below with reference to FIGS. 1 to 3.

As shown in FIG. 3, a connecting metal fitting 2 is fixed to the tip of a support arm 1 of a steel tower, and a suspension insulator 5 is connected to the connecting metal fitting 2 in series via a U clevis link 3 and a horn mounting metal fitting 4. A suspension insulator string 6 as a supporting insulator is supported so as to be swingable in the line direction and the orthogonal direction. A connecting link 8 is attached to the horn mounting bracket 7 at the lower end of the suspension insulator string 6.
An electric wire clamp 10 that supports the power transmission line 9 is supported via the. The horn mounting brackets 4 and 7 are equipped with arcing horns 11 and 12 for reducing damage to the surface flashover of the suspension insulator string 6 as much as possible.

A mounting adapter 13 is fixed to the tip of the support arm 1 by a bolt, and a first lightning insulator 14 is fixed to the lower surface of the tip of the adapter 13 with an electrode fitting 15 on the ground side. In addition, the grounding-side electrode metal fitting 15 of the second lightning protection insulator 17 is fixed to the lower end portion of the first lightning protection insulator 14, that is, the electrode fitting 16 on the charging side by bolts. Furthermore, the second
The grounding-side electrode metal fitting 15 of the third lightning protection insulator 18 is fixed to the electrode metal fitting 16 located on the lower end of the lightning protection insulator 17 by bolts.

The first to third lightning protection insulators 14, 17, 18 are pressure-resistant insulating cylinders (not shown) formed in a cylindrical shape by a tension-resistant material such as FRP,
A current limiting element (not shown) whose main characteristic is zinc oxide (ZnO) housed in series and whose voltage-current characteristics are non-linear.
And a pair of cap-shaped electrode fittings 16 and 15 on the power-supply side and the ground side, which are fitted and fixed to both ends of the pressure-proof insulating cylinder, and a rubber mold 19 provided on the outer periphery of the pressure-proof insulating cylinder. Has been done.

An arcing ring 20 is attached to each of the electrode fittings 15 and 16 by a support arm (not shown) to reduce damage when the rubber mold 19 flashes on the surface. A discharge electrode 21 on the ground side is attached to the electrode fitting 16 of the third lightning protection insulator 18.

On the other hand, the charging side horn mounting member 7 supports a discharging side discharge electrode 22 that faces the grounding side discharge electrode 21 and forms a predetermined air discharge gap G. As shown in FIG. 1, the discharge electrode 22 includes a mounting member 23 that is attached to the horn mounting bracket 7 on the power-supply side by a bolt,
A connecting member 24 made of a high-strength polymer material fitted to a mounting protrusion 23a integrally formed on the mounting member 23, and a discharge end portion fitted and fixed to the tip of the connecting member 24.
25, and the mounting protrusion 23 inserted into the connecting member 24 and
It is composed of a lead wire 26 that electrically connects a and the discharge end portion 25. The inside of the connecting member 24 is filled with an insulating filling material 27 such as a compound or foam insulating material in order to prevent corona discharge.

Insulation filler depending on the need of function or strength
Instead of using 27, the connecting member 24 may be integrally formed of a high-strength polymer material. The thickness of the lead wire 26 may be a sufficient cross-sectional area for passing a lightning surge current, or if the ground current should be taken into consideration, it may have a cross-sectional area corresponding thereto.

Further, the outer surface of the connecting member 24 is provided with a weather resistant insulating coating 28 such as fluororesin, silicone rubber or EPDM rubber. The tip portion of the weather resistant insulating coating 28 covers the outer peripheral surface of the base end of the discharge end portion 25. The tip of this discharge end portion 25 is formed in a hemispherical shape so as to relax the electric field.

On the other hand, since the discharge electrode 21 is formed in an arc shape, the discharge gap G is substantially constant even when the suspension insulator string 6 swings in the direction orthogonal to the line in FIG. I am trying to keep it.

Next, the operation of the transmission line lightning arrester device configured as described above will be described.

Now, when a large current is applied to the power transmission line 9 by a lightning stroke, this current is discharged from the wire clamp 10, the discharge electrode 22 to the discharge electrode 21 through the discharge gap G, and the electrode metal fitting 16 and the third lightning protection insulator 18 are discharged. It flows to the current limiting element (not shown) and the electrode fittings 15,1
6, through the current limiting elements (not shown) of the second and third lightning protection insulators 17 and 18, the electrode fittings 15 and 16 and the mounting adapter 13 to the support arm 1 and further to the steel tower to be discharged to the ground.
The subsequent current generated thereafter is limited and cut off by the current limiting element.

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

Further, when the discharge electrode 21 is made lighter, the weight of the arcing horn 12 that balances with the discharge electrode 21 becomes smaller,
Since the weight of the suspension load acting on the lower end portion of the suspension insulator string 6 is reduced, when the power transmission line 9 rolls due to wind pressure or the like, the inertial force becomes smaller, the roll angle becomes smaller, and immediately afterwards. Therefore, the insulation clearance between the transmission line 9 and the steel tower need not be designed so strictly.

The present invention is not limited to the above embodiment, but can be embodied as follows.

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

Effect of the Invention As described in detail above, since the present invention is composed almost entirely of the connecting member made of a high-strength polymer material except the mounting member and the discharge end, the entire discharge electrode is reduced in weight,
As a result, it is possible to easily carry and carry out the work of mounting on the steel tower. In addition, even if the transmission line oscillates with the discharge electrode attached to the lower end of the transmission line support insulator device, the discharge electrode is lightweight, so the arcing horn for balancing the discharge electrode is also lightweight. It is possible to reduce the overall weight of the lower end of the support insulator of the transmission line to reduce the inertial force, reduce the swing angle of the support insulator, shorten the swing time, and stabilize the discharge characteristics in the column state. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a central portion showing an embodiment of a discharge electrode embodying the present invention, FIG. 2 is an enlarged transverse sectional view of FIG. 1, and FIG. 3 is a front view showing the entire lightning arrester insulator device. FIG. 4 is a perspective view of an essential part showing another example of the present invention. 1 ... Support arm, 6 ... Suspended insulator string, 9 ... Transmission line,
13 …… Mounting adapter, 14 …… First lightning protection insulator, 15 …… Ground side electrode fitting, 16 …… Electrical charging side electrode fitting, 17 …… Second
Lightning insulator, 18 …… Third lightning insulator, 19 …… Rubber mold, 21 …… Ground side discharge electrode, 22 …… Electrical side discharge electrode, 23 …… Mounting member, 23a …… Mounting protrusion, 24 …… Coupling material, 25 …… Discharge end, 26 …… Lead wire, 27 …… Insulation filler, 28 …… Weatherproof insulation coating.

Claims (4)

(57) [Claims] 1. A mounting member attached to a horn mounting metal fitting on the power supply side and a discharge end portion facing a discharge electrode on the ground side are connected by a connecting member made of a high-strength polymer material, and the mounting member is connected to the mounting member. A discharge electrode in a lightning protection insulator device, characterized in that the discharge end is electrically connected by a lead wire inserted through a connecting member. 2. The discharge electrode in a lightning arrester device according to claim 1, wherein the surface of the connecting material has a weather resistant insulating coating. 3. A discharge electrode in a lightning arrester device according to claim 1, wherein said connecting material is hollow and has an insulating filler such as a silicon compound or a foam insulating material inside thereof. 4. The discharge electrode in a lightning arrester device according to claim 1, wherein the connecting member is solid.