JPH0834069B2 - V suspension type lightning arrester device for overhead power transmission line - Google Patents

Description

The present invention relates to a V-suspension type lightning arrester device for overhead power transmission lines.

[Prior Art] As a conventional V-suspension type lightning arrester device for overhead power transmission lines
There is one disclosed in Japanese Patent Publication No. 62-168305. This lightning protection insulator device connects a pair of left and right long trunk support insulators to a support arm of a steel tower in a V-shape, and connects a lower end of both long trunk support insulators to a connecting yoke via a connecting link and an electric wire clamp. The discharge yoke on the charging side is cantilever-supported in the direction orthogonal to the line direction on the connecting yoke, while the lightning protection insulator is suspended and fixed to the tip of the support arm via an attachment adapter. Further, at the lower end portion of the lightning protection insulator, there is supported an insulating-side discharge electrode facing the discharge-side discharge electrode with a predetermined air discharge gap.

[Problems to be Solved by the Invention] In the above-mentioned conventional lightning protection insulator device, since a pair of long-stem support insulators are mounted in a V-shape, even if the power transmission line swings due to wind pressure or the like, the long-stem support insulator is a line. Although it oscillates in the direction, it does not oscillate in the direction orthogonal to the line, and the air discharge gap between the two discharge electrodes does not change significantly. Therefore, the stable columnar state of the lightning protection insulator is maintained.

However, when a suspension insulator string in which a large number of suspension insulators are connected in series is used instead of the trunk support insulator, when the transmission line swings outward in the direction orthogonal to the line due to wind pressure, etc., the suspension insulator also swings in the same direction. Therefore, the suspension insulator on the side of the lightning arrestor bends, and the discharge electrode on the charging side supported by the connecting yoke collides with the discharge electrode on the insulated side supported by the lightning arrestor to deform or suspend both discharge electrodes. There was a problem that the insulators hit the lightning conductor and both insulators were damaged.

It is an object of the present invention that even when the suspension insulator string is bent, the discharge electrode on the charging side provided on the connecting yoke collides with the discharge electrode on the insulating side attached to the lightning arrestor, or the suspension insulator string collides with the lightning insulator. Or the collision of the discharge electrode on the charging side with the lightning protection insulator, and it is possible to prevent deformation of the discharge electrode and damage to the lightning protection insulator and suspension insulator contacts, etc. To provide a device.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention makes it possible to swing a pair of suspension insulators in a line direction to a support arm via a suspending metal fitting, and to form a substantially V shape. The transmission yoke is mounted on the connecting yoke that connects the lower end portions of both suspension insulator chains via an electric wire clamp, and the lightning insulator is laterally supported on the tip portion of the support arm via a mounting adapter. The connecting yoke supports a discharge electrode on the charging side that extends in the same direction as the line direction and bends in the direction orthogonal to the line, and further extends downward in the lightning protection insulator so that it has a line direction component. The insulating discharge electrodes are attached, and a predetermined air discharge gap is provided between the discharge electrodes.

[Operation] According to the present invention, even if the power transmission line oscillates outward in the direction orthogonal to the line due to wind pressure or the like, the suspension insulator string located outside bends, and the discharge electrode on the charging side is lifted upward together with the connecting yoke,
There is no collision between the discharge electrode on the charging side and the suspended insulator string,
Moreover, since the discharge electrode on the charging side does not collide with the discharge electrode on the insulating side and the lightning arrester, and the suspension insulator series does not collide with the lightning insulator, the discharge electrode is deformed or the suspension insulator string or the lightning insulator is formed. The damage of is suppressed.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 2, a pair of left and right hanging metal fittings 2,2 are fixed to the support arm 1 of the steel tower with bolts.
Is connected to a suspension insulator series 4, 4 formed by connecting a plurality of suspension insulators in series via upper connection fittings 3, 3, respectively, and lower connection fittings 5, 4 are attached to the lower ends of the suspension insulator series 4, 4. The connecting yoke 6 in the shape of an inverted triangular plate is connected via a connecting pin via 5,
The pair of left and right suspension insulators 4, 4 are mounted in a substantially V-suspended manner. A transmission line 9 is supported on the lower end of the connecting yoke 6 via a connecting link 7 and an electric wire clamp 8.

A discharge electrode 10 on the charging side is supported on one side surface of the connecting yoke 6. As shown in FIG. 1, the discharge electrode 10 penetrates the connecting yoke 6 and is fixed by a nut, and a base end portion 10a extending parallel to the power transmission line 9 and the base end portion 10a.
Is formed by an intermediate portion 10b bent in the direction orthogonal to the line, and a discharge portion 10c bent from the intermediate portion 10b so as to be substantially parallel to the line direction.

It should be noted that the upper connecting fitting 3 and the lower connecting fitting 5 have an arc horn 1 for preventing the flashover of the suspension insulator chains 4, 4.
1,12 are supported respectively.

A mounting adapter 13 is supported at the tip of the support arm 1 toward the front (right side in FIG. 2).
As shown in FIG. 1, a grounding side electrode fitting 15 provided at the base end of the lightning protection insulator 14 is fixed to the vertical surface of the bolt by bolts. The lightning protection insulator 14 is a pressure-resistant insulating cylinder (not shown) formed in a cylindrical shape by FRP or the like, and a current limiting main body made of zinc oxide housed inside the pressure-resistant insulating cylinder and having a nonlinear voltage-current characteristic. An element (not shown), and electrode fittings 15 and 16 on the ground side and the charging side, which are fitted and fixed to both ends of the pressure-proof insulating cylinder,
In addition, the insulation jacket is rubber-molded on the exterior of the pressure-proof insulation cylinder.
It is composed of 17 and.

The electrode fitting 16 on the charging side supports the discharging electrode 18 on the insulating side facing the discharging electrode 10 on the charging side with a predetermined air discharge gap G. As shown in FIG. 2, the discharge electrode 18 has a vertical portion 18a extending vertically downward and a horizontal portion 18b extending from the vertical portion 18a in a direction parallel to the line direction.
And an arc-shaped discharge portion 18c formed in an arc shape centered on the base end mounting portion O of the discharge electrode 10 on the charging side.

Next, the operation of the V-suspension type lightning arrester device configured as described above will be described.

Now, when a surge current due to a lightning strike flows in the power transmission line, the current is flashed over to the insulation side discharge electrode 18 via the wire clamp 8, the connection link 7, the connection yoke 6 and the discharge side discharge electrode 10, and It is discharged to the steel tower through the metal fitting 16, the current limiting element (not shown), the electrode metal fitting 15, the mounting adapter 13 and the support arm 1. Further, the subsequent current generated thereafter is suppressed and cut off by the current limiting element and the air discharge gap G, and the ground fault is prevented in advance.

In the embodiment of the present invention, the discharge electrode 10 on the charging side is provided with a base end portion 10a extending from the connecting yoke 6 in the line direction and an intermediate portion 10b bent at a right angle from the base end portion 10a as shown in FIG. Further, since the intermediate portion 10b and the discharge portion 10c curved in the line direction are formed to be curved so as to bypass the suspension insulator series 4 on the side of the lightning arrestor 14, the power transmission line 9 is stopped by wind pressure or the like as shown in FIG. When the outer suspension insulator string 4 is bent by swinging outward from the position as shown in FIG. 3 in the direction orthogonal to the line, the collision between the discharge electrode 10 on the voltage application side and the suspension insulator string 4 is avoided.

Further, since the upright portion 18a of the discharge electrode 18 on the insulating side is displaced in the line direction from the discharge electrode 10 on the voltage applying side, the discharge electrodes 10 and 18 do not collide with each other. Further, since the lightning arrestor 14 is horizontally held at the same height as the tip of the support arm 1, the discharge electrode 10 on the charging side and the suspension insulator string 4 on the outside may collide with the lightning arrestor 14. Without both discharge electrodes
The deformation of 10, 18 or the suspension of the suspension insulator 4 and the damage of the lightning arrester 14 are prevented.

Further, in the above embodiment, the arc-shaped discharge part 18c is provided at the tip of the discharge electrode 18 on the insulating side, and when the curvature of the discharge line 18c swings in the line direction, the discharge electrode 10 on the charging side discharges. Since the arc shape is set to be substantially the same as the arc drawn by the tip of the portion 10c, the air discharge gap G is held substantially constant when the power transmission line 9 swings in the line direction, and the discharge characteristics are stabilized.

 The present invention can also be embodied as follows.

As shown in FIG. 4, the discharge electrode 10 on the charging side is formed in an arc shape when seen from a plane, or a balance weight 23 is provided on the opposite side of the connecting yoke 6 in order to balance the weight of the discharge electrode 10 and the like. The configuration may be arbitrarily modified and embodied within the scope of the claims of the present invention.

[Effects of the Invention] As described in detail above, according to the present invention, when the power transmission line oscillates in the direction orthogonal to the line due to wind pressure or the like, the discharge electrode on the voltage application side collides with the suspension insulator string, or the discharge on the voltage application side occurs. Avoid the collision between the electrode and the discharge electrode on the insulation side and the lightning arrestor, and further avoid the collision between the suspension insulator string and the discharge electrode on the insulation side and the lightning insulator, and the deformation of both discharge electrodes and the damage to the suspension insulator string or the lightning insulator It is possible to prevent this, and it is possible to improve durability and reliability.

[Brief description of drawings]

1 to 3 show an embodiment of a V-suspension type lightning arrester device for a power transmission line of the present invention, and FIG. 1 is a plan view of a discharge electrode on the charging side, a discharge electrode on the insulating side and a lightning arrester, FIG. 2 is a front view of the power transmission line in a stationary state, FIG. 3 is a front view of the power transmission line swinging outward in the track direction, and FIG. 4 is another embodiment of the present invention. FIG. 1 ... Support arm, 2 ... Suspension metal fitting, 4 ... Suspended insulator string, 6 ... Connection yoke, 8 ... Electric wire clamp, 9 ... Transmission line, 10 ... Discharge electrode on the power-supply side, 13 ... … Mounting adapter,
14: Lightning arrester, 18: Discharge electrode on the insulating side, G: Air discharge gap.

Claims (1)

[Claims] 1. A suspension metal fitting (2) for a support arm (1).
A pair of suspension insulator series (4) is mounted in a substantially V-shaped manner so as to be able to swing in the line direction via a wire, and an electric wire is attached to a connecting yoke (6) that connects the lower end portions of both suspension insulator series (4). The power transmission line is supported through the clamp (8), and the support arm (1) is provided.
The lightning insulator (1
4) is supported laterally, the connecting yoke (6) supports the discharge electrode (10) on the power-supply side that extends in the same direction as the line direction and bends in the direction orthogonal to the line, and further, the lightning protection insulator (10). The discharge electrode (18) on the insulating side is attached so as to have a component in the line direction after extending downward in (14), and a predetermined air discharge gap (10) is formed between the discharge electrodes (10, 18). V suspension type lightning arrester device characterized in that G) is provided.