JP2545418B2 - Lightning-proof horn insulator device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention rapidly discharges a high voltage, that is, a lightning surge caused by a lightning strike on a power transmission line, and continuously generates it after that. TECHNICAL FIELD The present invention relates to a lightning protection horn insulator device for an overhead power transmission line for shutting off a power source and preventing a permanent ground fault.

(Prior Art) In a conventional lightning protection horn insulator device, a suspension insulator is rotatably connected to a support arm of a steel tower via an upper suspension metal member so as to hang down, and a lower portion is provided at a lower portion of the suspension insulator. The power line is installed via the hanging metal fittings. Further, the lightning protection insulator is suspended and fixed to the supporting arm via a mounting adapter while being displaced by a predetermined distance in the track direction with respect to the suspension light insulator, and the lower suspension metal fitting extends to the lightning protection insulator side. The arc horn on the charging side is provided, and the arc horn attached to the lower portion of the lightning protection insulator and the arc horn face each other with a predetermined air discharge gap.

(Problems to be Solved by the Invention) In the above-mentioned conventional device, since the lightning arrestor is arranged while being displaced in the line direction, when the power transmission line sways due to wind pressure or the like, the discharge gap is made substantially constant. Therefore, there is an advantage that it is easy to emphasize insulation. However, should the power line be disconnected, the suspension insulator is momentarily rotated upward and upward in the direction of the track centering on the upper suspension point, and the suspension insulator collides with the lightning protection insulator, There is a possibility that the outer cover of the insulator, for example, the rubber mold may be broken or the current limiting element made of zinc oxide housed inside may be damaged.

Further, when the suspension insulator is so strong that the lightning insulator is broken, the fragments are scattered, which may be harmful to humans and animals.

In view of the above circumstances, the present invention prevents damage to the lightning insulator even if the power transmission line is disconnected and the hanging insulator collides with the lightning insulator, and the environment of the lightning insulator in such an abnormal situation An object is to provide a lightning protection horn insulator device which can improve safety.

Configuration of the Invention (Means for Solving the Problems) In order to solve the above problems, the present invention rotatably connects a suspension insulator to a support arm of a tower through an upper suspension metal fitting, A lower suspension fitting for supporting a power transmission line is connected to a lower end portion of the suspension element, and a lightning protection insulator is located on the support arm via a suspension adapter at a lateral side of the suspension insulator in a line direction. The lower suspension fitting is provided with an arc horn on the charging side extending to the side of the lightning arrestor, and the lower end of the lightning insulator faces the arc horn with a predetermined air discharge gap. In a lightning protection horn insulator device provided with an arc horn on the ground side, the suspension insulator is rotated upward around its upper suspension point by the disconnection of the power transmission line, and when it collides with the lightning protection insulator,
The mounting adapter is provided with a displacement permitting means for displacing the lightning protection insulator by the collision energy.

(Operation) In the present invention, when the power transmission line is disconnected and the suspension insulator momentarily rotates around the upper suspension point and collides with the lightning protection insulator, displacement is allowed by the external impact force. When the lightning protection insulator is displaced from the regular mounting position to the retracted position by the operation of the means, the collision energy of the suspension insulator with respect to the lightning protection insulator is attenuated, the damage to the lightning protection insulator outer cover part or the current limiting element housed inside. Damage is prevented and damage to humans and animals due to scattering of lightning insulator fragments is eliminated. Furthermore, the replacement of the lightning protection insulator is no longer necessary.

(Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.

A support metal fitting 3 is fixed to the support arm 2 mounted on the steel tower 1 with bolts, and a suspension insulator 5 is rotatably supported on the metal support 3 via an upper suspension metal fitting 4. A power transmission line 8 is installed at the lower end of the suspension insulator 5 via a lower suspension fitting 6 and an electric wire clamp 7. In addition, the lower suspension metal fitting 6 supports an arc horn 9 on the side of a power supply which faces an arc horn 20 on the ground side described later with a predetermined air discharge gap G therebetween.

On the lower surface of the support arm 2, a pair of upper and lower fixed support plates 11 constituting a mounting adapter 10 are cantilevered by bolts. In addition, a movable support plate that also constitutes a mounting adapter 10 between the ends of both fixed support plates 11.
The base end of 12 is inserted, the connecting pin 13 is inserted into the through holes 11a, 12a provided through both plates 11, 12, and the movable support plate 12 is rotatable about the connecting pin 13 in the horizontal direction. It is installed. It should be noted that the connecting pin 13 has a lower end which is prevented from being separated by a split pin 14. Further, a stopper bolt 15 as a displacement permitting means K of an electric insulator 17 described below is penetratingly supported in the insertion holes 11b, 12b formed in the fixed support plate 11 and the movable support plate 12, and a nut 16 is provided at a lower end thereof by a nut 16. It is fastened. The stopper bolt 15 is sheared by a predetermined external force.

A lightning protection insulator 17 is fixed to the tip of the movable support plate 12 by bolts so that it is located laterally in the line direction of the suspension insulator 5 with an electrode fitting 18 on the ground side thereof.

Electrode metal fittings 19 on the power-supply side located below the lightning protection insulator 17
A grounding side arc horn 20 facing the voltage applying side arc horn 9 is attached to extend in the line orthogonal direction.

The lightning protection insulator 17 is a cylindrical withstand voltage insulation tube (not shown) formed of FRP or the like, and a current limiting element (not shown) made of zinc oxide or the like having a non-linear voltage-current characteristic housed in the insulation tube. And a rubber mold 21 integrally covering the outside of the pressure-proof insulating cylinder.

In the figure, 22 is an arc horn provided to prevent creeping flashing of the suspension insulator 5, and 23 is an arcing ring provided to prevent creeping flashing of the lightning protection insulator 17.

Next, the operation of the lightning-resistant horn insulator device configured as described above will be described.

Now, when a lightning surge current enters the power transmission line 8, this surge current flows to the arc horn 9 through the lower suspension fitting 6,
After that, the air gap G is flashed and flows from the arc horn 20 to the electrode fitting 19, the current limiting element (not shown) inside the lightning protection insulator 17, and the electrode fitting 18, the movable mounting plate 12, the fixed support plate 11 and the support arm. It is discharged to the steel tower 1 via 2. The connection by the commercial frequency current generated thereafter is suppressed and cut off by the current limiting element and the air gap G.

In the embodiment of the present invention, the lightning insulator is attached to the mounting adapter 10.
The stopper bolt 15 as the displacement permitting means K of 17 is provided,
The power transmission line 8 is disconnected, and the suspension insulator 5 instantly rotates in the direction of the arrow P (line direction) in FIG. 1 around the upper suspension point, and the suspension insulator 5 collides with the lightning protection insulator 17. In this case, the lightning protection insulator 17 is the first
In the figure, the movable support plate 12 and the connecting pin 13 are applied to the stopper bolt 15 by the principle of leverage before the lightning protection insulator 17 is damaged, because it receives a rotational force to rotate in the direction of the arrow Q in FIG. Since the breaking capacity is designed to be lower than the shearing load, the stopper bolt 15 is sheared and the lightning protection insulator 17 rotates together with the movable support plate 12 in the Q arrow direction. As a result, lightning protection insulator 17
The collision energy of the suspension insulator 5 with respect to is relaxed, damage to the rubber mold 21 of the lightning insulator, damage to the current limiting element (not shown), or breakage of the lightning insulator 17 is prevented, and scattering of fragments of the lightning insulator 17 is eliminated. The safety can be improved.

The present invention can also be embodied as follows.

(1) As shown in FIGS. 4 and 5, a circular arc-shaped long hole 12c is formed in the movable support plate 12, and a bolt 25 as a displacement permitting means K is inserted into the long hole and is inserted into the bolt 25. Nut 26
By screwing together the fixed support plate 11 and the movable support plate 12
And should be fixed with a predetermined tightening force. In this example, when the suspension insulator 5 collides with the lightning protection insulator 17, both plates 11, 1
The lightning protection insulator 17 can be displaced by rotating the movable support plate 12 against the contact frictional resistance of 2.

(2) As shown in FIG. 6, the fixed support plate 11 and the rotary support plate 12 are rupturable rods as the displacement permitting means K.
Connect with 27.

(3) As shown in FIG. 7, small-diameter portions 15a are provided at both upper and lower ends of the stopper bolt 15 [shown in FIG. 8 (a), but this may be a recess 15b as shown in FIG. 8 (b)]. And form the bolt 15 from which the bolt 15 is sheared.

(4) Although not shown, the movable support plate 12 is supported so as to rotate upward with respect to the fixed support plate 11.

(5) Only the fixed support plate or the movable support plate is used as the mounting adapter 10, and the lightning protection insulator is attached to the tip end portion of the fixed support plate through the displacement permitting means, or the base end of the movable support plate is supported by the support arm 2. For example, it is attached via displacement allowance means.

Effects of the Invention As described in detail above, according to the present invention, even if the power transmission line is disconnected and the suspension insulator is rotated upward about the upper suspension point and collides with the lightning protection insulator. There is an effect that the collision energy is alleviated to prevent damage to the lightning arrestor, damage to the current limiting element, or breakage of the lightning arrestor, to prevent scattered fragments from falling and to improve environmental safety.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment embodying the present invention,
2 is a front view of FIG. 1, FIG. 3 is an enlarged sectional view taken along the line AA of FIG. 1, FIG. 4 is a plan view of only a main part showing another example of the present invention, and FIG. FIG. 4 is a sectional view taken along the line BB in FIG. 4, and FIG. 6 is a plan view of only a main part showing another example of the present invention, FIG. 7 and FIG.
Figures (a) and (b) further show another example of the present invention, and Figure 7 is a partially cutaway front view of only the main part, and Figures 8 (a) and (b).
[Fig. 3] is a cross-sectional view of stopper bolts. 2 ... Support arm, 4 ... Upper hanging bracket, 5 ... Hanging insulator, 62 ... Lower hanging bracket, 8 ... Transmission line, 9 ... Electric arc side horn, 10 ... Mounting adapter , 11 …… Fixed support plate, 12 …… Movable support plate, 13 …… Connecting pin,
15 …… Stopper bolt as displacement allowance means of lightning protection insulator,
15a …… Small diameter part, 16 …… Nut, 17 …… Lightning arrester, 18,19
...... Electrode metal fittings, 20 ...... Grounding side arc horn, 25 ...... Bolts as displacement permitting means of lightning arrestor, 27 ...... Breakable rods as displacement permitting means of lightning insulator, K ...... Allowable displacement of lightning insulator Means, G ... Air discharge gap.

Claims (5)

(57) [Claims] 1. A suspension insulator (5) is rotatably connected to a support arm (2) of a steel tower via an upper suspension metal fitting (4), and a lower end portion of the suspension insulator (5). A lower suspension metal fitting (6) for supporting a power transmission line (8) is connected to the suspension armature, and a lightning arrester (17) is connected to the support arm (2) via a suspension adapter (10). It is supported so as to be located on the side of the line direction of (5), and the lower suspension metal fitting (6) is provided with an arc horn (9) on the power-supply side that extends toward the lightning protection insulator (17) side. In the lightning protection horn insulator device, a grounding side arc horn (20) facing the arc horn (9) at a predetermined air discharge gap (G) is provided at the lower end of the lightning protection insulator (17). Due to the disconnection of 8), the suspension insulator (5) is rotated upward around the upper suspension point, and the lightning protection insulator (17) is provided.
The lightning protection horn insulator device, wherein the mounting adapter (10) is provided with a displacement permitting means (K) for displacing the lightning protection insulator (17) by the collision energy. 2. The mounting adapter (10) comprises a pair of upper and lower fixed support plates (11) fixed to a support arm (2).
And a movable support plate (12) rotatably supported by a connecting pin (13) at its tip, and through insertion holes (11b, 12b) transparently provided in both plates (11, 12). The lightning protection horn insulator device according to claim 1, wherein a stopper bolt (15) as a displacement permitting means (K) of the lightning protection insulator is inserted. 3. The lightning protection horn insulator device according to claim 2, wherein the stopper bolt (15) has a small diameter portion (15a) for shearing at the upper and lower portions. 4. Between the support plates (11, 12),
The lightning protection horn insulator device according to claim 2, wherein a rupturable rod (27) serving as a displacement permitting means (K) of the lightning arrestor is connected. 5. An elongated hole (12) is formed in the movable support plate (12).
c) is formed, and a bolt (25) as a displacement permitting means (K) inserted from the fixed support plate (11) into the elongated hole.
3. The lightning protection horn insulator device according to claim 2, wherein the bolt is fitted with a nut (26), and both support plates (11, 12) are fastened and fixed at a predetermined pressure.