JPH04289617A - Lightning insulator device - Google Patents

Abstract

PURPOSE:To improve electrical reliability without the possibility of depositing snow or others to a lightning insulator. CONSTITUTION:A snow dropping chuter 22 with a snow slipping slope S extended from a supporting arm 1 is mounted on the upper side of a mounting bracket 13. The snow dropping chuter 22 has the tip edge and both edges protruded 50m outward from the outside edge of a lightning insulator 14. Then, the contact and deposit of snow or ice columns to the lightning insulator 14 is prevented even when snow goes around the tip edge or both edges of the snow dropping chuter 22 and deposits thereto or ice columns occur, so that the creepage insulation strength of the lightning insulator 14 is secured to improve electrical reliability.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] When an abnormally large current flows through a power transmission line due to a lightning strike, the present invention uses a lightning protection function to quickly discharge it to the ground, suppress and interrupt the follow-on current, and prevent permanent ground faults. This invention relates to a lightning arrester device that can provide lightning protection.

0002

[Prior Art] Conventionally, as a lightning arrester device, a power transmission line is supported at the tip of a support arm of a steel tower via a support insulator, and a mounting bracket is horizontally cantilevered to the support arm. A lightning arrester is hung and fixed, and the grounding side discharge electrode attached to the lower end of the lightning arrester and the energizing side discharge electrode attached to the lower end of the support insulator are opposed to each other with a predetermined discharge gap.

[0003] In this lightning arrester device, when it snows, the snow wraps around the upper part of the lightning arrester and substantially reduces its creepage insulation distance, making it impossible to block the follow-on current following an electric shock. In order to prevent the creeping insulation strength of the lightning arrester from decreasing early due to a large amount of snow containing dust adhering to the surface of the lightning arrester and contaminating the surface, a Some devices include a snow cap falling chute having a snow sliding slope extending from a support arm. The snow falling on the lightning arrester device is slid down the slope by the snow cap falling chute and does not adhere to the lightning arrester, thereby suppressing a decrease in the creepage insulation distance of the lightning arrester.

0004

[Problems to be Solved by the Invention] However, in the above-mentioned conventional lightning arrester device, snow falls from the tip or both ends of the snow cap falling chute, but the snow does not fall and falls from the tip of the snow cap snow falling chute. In some cases, the chute may become attached to the tip or both ends of the chute, or icicles may form on the tip or both ends of the chute. There is a problem in that the snow and icicles that have wandered around come into contact with or adhere to the lightning arrester, reducing the insulation performance of the lightning arrester.

The present invention has been made to solve the above-mentioned problems, and its object is to provide a lightning arrester device that can improve electrical reliability without the risk of snow or the like adhering to the lightning arrester. Our goal is to provide the following.

[0006]

[Means for Solving the Problems] In order to achieve the above object, in the first invention, a power transmission line is supported via a support insulator on a support arm of a steel tower, and a lightning arrester is supported via a mounting bracket. In a lightning arrester device in which a grounding side discharge electrode attached to the tip thereof faces a energized side discharge electrode attached to the power transmission line side with a predetermined discharge gap, a support arm is provided above the mounting bracket. Or, a snow cap snow release chute having a snow sliding slope extending from a position close to the support arm is provided, and the edge of the snow cap snow release chute protrudes outward by at least 20 mm from the outer edge of the lightning arrester. It is.

[0007] In the second aspect of the invention, the end edge of the snow-covered chute is bent upward.

[0008]

[Operation] Therefore, according to the first invention, even if snow wraps around and adheres to the edge of the snow capping chute or an icicle is formed, the edge of the snow capping chute Since there is a distance of at least 20 mm between the outer edge of the lightning arrester and the outer edge of the lightning arrester, there is no risk that snow or icicles that have wrapped around the lightning arrester will come into contact with or adhere to the lightning arrester.

According to the second aspect of the invention, since the edge of the snow cap falling chute is bent upward, there is no risk of snow getting around to the edge.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying the present invention will be described below with reference to the drawings. As shown in FIG. 1, a connecting fitting 2 is fixed to the tip of the support arm 1 of the steel tower.
A suspension insulator chain 6 as a support insulator, which is made up of suspension insulators 5 connected in series via a U clevis link 3 and a horn fitting 4, is supported so as to be swingable in the line direction and 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. the horn mounting bracket 4;
Arcing horns 11 and 12 are attached to the suspension insulators 7 in order to reduce damage caused by creeping flash to the suspension insulator chain 6 as much as possible.

A mounting bracket 13 is horizontally fixed to the tip of the support arm 1 with bolts, and a lightning arrester 14 is suspended and fixed to the lower surface of the tip of the bracket 13 with an electrode fitting 15 on the ground side by bolts. ing. Further, a horn-shaped discharge electrode 17 on the ground side is supported at the lower end of the lightning arrester 14, that is, on the electrode fitting 16 on the power supply side.

On the other hand, a power supply side discharge electrode 18 having a horn shape approximately in the line direction is cantilever-supported by a bolt on the horn mounting bracket 7, and the discharge electrode 18 and the discharge electrode 1
7, a predetermined aerial discharge gap G is provided between the two. The tip of the discharge electrode 17 is formed into a substantially arc shape when viewed from the direction perpendicular to the line, so that the discharge gap G is maintained almost constant even if the suspension insulator chain 6 swings in the line direction. .

The lightning arrester 14 includes a voltage-resistant insulating tube (not shown) formed in a cylindrical shape from a tensile material such as FRP, and a voltage insulator mainly made of zinc oxide (ZnO) housed in series inside the tube. - A current-limiting element (not shown) with non-linear current characteristics, cap-shaped electrode fittings 16 and 15 on the power supply side and the grounding side that are fitted and fixed to both ends of the voltage-resistant insulation cylinder, and further voltage-resistant insulation It is formed by a rubber mold 19 provided on the outer periphery of the cylinder. Incidentally, the electrode fittings 16 and 15 on the charging side and the grounding side of the lightning arrester 14 are provided with arcing rings 20 and 2 to reduce damage to the rubber mold 19 during creeping flash.
1 is provided.

As shown in FIGS. 1 and 2, a snow cover chute 22 is mounted on the upper side of the mounting bracket 13. As shown in FIGS. Locking plates 23 and 24 are formed at both ends of this snow cap falling chute 22, and each locking plate 23 and 24 is fastened to the inclined frame 1a of the support arm 1 and the tip of the mounting bracket 13 by bolts 25, respectively. The snow cap falling chute 22 is attached by being attached and fixed. Further, the snow cap falling chute 22 is formed in the shape of a mountain that descends toward both side edges, and its upper surface is located lower toward the tip, and the upper surface of the chute 22 is formed on the snow sliding slope S. It becomes. The snow cap that has moved from the inclined frame 1a of the support arm 1 moves along the slope S to both ends or the tip of the snow cap falling chute 22 and falls thereon.

As shown in FIGS. 1 and 2, the leading edge and both side edges of the snow-covered chute 22 are provided with a lightning arrester 14.
It protrudes outward by Hmm from the outer edge of. This distance Hm
m should be at least 20 mm or more, preferably 50 mm or more, and in this embodiment, it is approximately 50 mm. The inventor of the present application observed the adhesion of wrapped snow and the formation of icicles at the tip edge and both side edges of the snow cap falling chute 22, and found that if the distance H is at least 20 mm, It was confirmed that the snow and icicles did not come into contact with or adhere to the lightning arrester 14.

A snow returning plate 26 is vertically welded and fixed to the middle part of the mounting bracket 13.
3 to prevent snow from entering the lightning arrester 14 side. Next, the operation of the lightning arrester device configured as described above will be explained. Now, when an abnormally large current that exceeds expectations is applied to the power transmission line 9 due to a large-scale electric shock, this current flows from the wire clamp 10 and the discharge electrode 18 through the discharge gap G to the discharge electrode 17.
It flows from the electrode fitting 16 to the current limiting element (not shown) in the lightning arrester 14, from the electrode fitting 15 on the ground side through the mounting bracket 13, to the support arm 1, 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 this embodiment, the mounting bracket 1
3, snow that is about to move from the inclined frame 1a of the support arm 1 toward the mounting bracket 13 is moved along the slope S of the snow cap chutes 22 to the tip or The shooter 22 is moved to both ends.
It will not fall from the ground and attach to the lightning arrester 14. or,
The tip edge and both side edges of the snow cap falling chute 22 protrude outward by approximately 50 mm from the outer edge of the lightning arrester 14 to ensure a sufficient distance between them.
Even if snow wraps around and adheres to the leading edge or both side edges of the lightning arrester 14, or icicles form, there is no risk of the snow or icicles coming into contact with or adhering to the lightning arrester 14. Therefore, the surface insulation strength of the lightning arrester 14 does not decrease, and the insulation strength is reliably maintained.

Further, although the amount of snow that has moved from the support arm 1 to the mounting bracket 13 falls from the snow return plate 26, it is prevented from adhering to the lightning arrester 14. still,
The present invention is not limited to the embodiments described above, and for example, as shown in FIG. 4, or by bending the tip edge of the snow cap falling chute 22 upward to prevent snow from wrapping around the tip edge of the chute 22. Alternatively, as shown in FIG.
It is also possible to arbitrarily change and embody the configuration of each part without departing from the spirit of the invention.

[0019]

As described in detail above, according to the present invention, the tip edge and both side edges of the snow-covered snow falling chute having a snow sliding slope are moved outward by at least 20 mm from the outer edge of the lightning arrester. By protruding from the side, even if snow wraps around and adheres to the tip edge or both side edges of the snow-capped snow chute, or if icicles form, the snow or icicles will not come into contact with or adhere to the lightning arrester. This makes it possible to ensure the creeping insulation strength of the lightning arrester, ensure that the follow-up current following an electric shock is interrupted, and improve electrical reliability.

[0020]Furthermore, by bending the tip edge or both side edges of the snow cap snow falling chute upward, it is possible to prevent snow from turning around at the tip edge or both side edges of the snow cap snow falling chute. It has the excellent effect of preventing

[Brief explanation of the drawing]

FIG. 1 is a front view showing the entirety of a lightning arrester device embodying the present invention.

FIG. 2 is a partial side view showing a snow cap ejecting chute.

FIG. 3 is a partial side view showing another example of the snow-covered snow ejecting chute.

FIG. 4 is a partial front view showing another example of the snow-covered snowfall chute.

FIG. 5 is a partial side view showing another example of the snow-covered snowfall chute.

[Explanation of symbols]

1 Support arm, 6 Suspension insulator chain (support insulator), 9
Power transmission line, 13 Mounting bracket, 14 Lightning arrester, 17 Earthing side discharge electrode, 18 Power supply side discharge electrode, 22 Snow cap falling chute, G discharge gap, S
Slope.

Claims (2)

[Claims] [Claim 1] A support insulator (
5) supports the power transmission line (9) via the mounting bracket (13), and supports the lightning arrester (14) via the mounting bracket (13);
A lightning arrester device in which a grounding side discharge electrode (17) attached to the tip thereof faces a energized side discharge electrode (18) attached to the power transmission line (9) side with a predetermined discharge gap (G). A snow cap falling chute (22) having a snow sliding slope (S) extending from the support arm (1) or a position close to the support arm (1) is provided above the mounting bracket (13), and the snow cap falling chute (22) is provided above the mounting bracket (13). A lightning arrester device characterized in that the end edge of the output chute (22) is made to protrude outward by at least 20 mm from the outer end edge of the lightning arrester (14). 2. The lightning arrester device according to claim 1, wherein an end edge of the snow capping chute (22) is bent upward.