JPH04269408A - Lighting protection device for v-suspension insulator device - Google Patents

Abstract

PURPOSE:To stabilize a discharge characteristic as a lighting protection device by holding an aerial discharge gap at a constant value between a discharge electrode on the electrification side and a discharge electrode on the earth side even if a transmission line swings in the line direction or in the orthogonal direction thereto in a V-suspension insulator device. CONSTITUTION:A discharge electrode 10 on the electrification side is supported to the suspension metal fixtures 5 on the electrification side located on the lower end part of one side suspension insulator series 4. An arc-shaped discharge part to become projecting under this discharge electrode 10 is positioned within an imaginary plane passing through a central axial line and extending in the line direction. Further, in a low end part of a lightning protection device main body 14, a rod-shaped discharge part 19b vertical to the imaginary plane is supported so as to be located near the arc center of the arc-shaped discharge part.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a lightning arrester for a V-type insulator.

0002

[Prior Art] As a conventional lightning arrester for a V-insulator device,
There is one disclosed in Japanese Unexamined Patent Publication No. 168305/1983. This lightning arrester connects a pair of left and right long trunk insulators in a V-shape to the support arms of the steel tower, and supports the power transmission line via a connecting link and wire clamp to a connecting yoke that connects the lower ends of both long trunk insulators. , a discharge electrode on the energized side is cantilever-supported in a direction perpendicular to the line direction with respect to the connection yoke, and a lightning arrester main body is suspended and fixed to the tip of the support arm via a mounting adapter; The lower end of the main body of the lightning arrester supported a ground-side discharge electrode that faced the energized-side discharge electrode with a predetermined aerial discharge gap.

0003

[Problem to be Solved by the Invention] The above-mentioned conventional lightning arrester has a pair of long trunk insulators installed in a V-shape, so even if the power transmission line swings due to wind pressure, the long trunk insulator does not move in the direction of the line. Although it oscillates, it does not oscillate in the direction perpendicular to the line, and the air discharge gap between the two discharge electrodes does not change significantly. Therefore, a column-mounted state with stable discharge characteristics is maintained.

However, when a suspension insulator chain in which a large number of suspension insulators are connected in series is used instead of the long trunk insulator, when the power transmission line swings in a direction perpendicular to the line due to wind pressure, the suspension insulator chain also swings in the same direction. Due to the oscillation, the gap between the discharge electrodes on the energizing side and the grounding side changes, so there is a problem that adaptation is not possible. The object of the present invention is to provide a V-suspended insulator that can maintain an almost constant air discharge gap between the discharge electrodes on the energizing side and the grounding side even when the V-suspended insulator device swings in the line direction and the direction perpendicular to the line. An object of the present invention is to provide a lightning arrester for an insulator device.

[0005]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention connects the upper ends of a pair of suspension insulator chains to the support arm via a grounding side hanging metal fitting, and The energizing side hanging fittings are respectively connected between the lower ends, and between the two energizing side hanging fittings, a connecting yoke is used so that both suspension insulator chains are approximately V-shaped in the direction of the line and in the direction perpendicular to the line. The connection yoke supports the power transmission line via a wire clamp, the lightning arrester main body is attached to the support arm via a mounting adapter, and both of the power-supply-side hanging fittings are connected to each other so as to be able to swing. On one of the hanging fittings, an arc-shaped discharge electrode on the energizing side extends in substantially the same direction as the line direction, and the arc-shaped discharge part of the discharge electrode is lowered along the diagonal suspension insulator link axis. A rod-shaped discharge electrode is arranged in a convex shape in the opposite direction and is opposed to the distal end of the lightning arrester main body with a predetermined aerial discharge gap from the discharge electrode on the energizing side. A method is adopted in which the electrodes are arranged substantially orthogonally and near the center of the arc of the arc-shaped discharge section.

[0006]

[Operation] This invention provides that when the power transmission line swings in the direction of the line due to wind pressure, etc., the tip of the arc-shaped discharge part of the discharge electrode on the energizing side forms an arc centered on the upper suspension point of the suspended insulator chain. It is oscillated along a locus, and the air discharge gap between the tip of the arc-shaped discharge section and the ground-side discharge electrode is maintained substantially constant. In addition, when the power transmission line swings in the direction perpendicular to the line due to wind pressure, etc., the discharge electrode on the energized side, together with the suspension fitting on the energized side, moves in an arcuate trajectory centered on the upper suspension point of one suspension insulator chain. Since the discharge electrode oscillates along the arc trajectory, the discharge gap between the discharge electrode and the ground-side discharge electrode, which is disposed opposite to the discharge electrode substantially parallel to the direction of the circular arc trajectory, is maintained substantially constant.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in Fig. 1, a pair of left and right mounting brackets 2, 2 are fixed to the support arm 1 of the steel tower with bolts, and each of the mounting brackets 2, 2 has a ground side hanging bracket 3.
, 3 are connected to suspension insulator chains 4, 4 formed by connecting a plurality of suspension insulators in series, and the lower ends of both suspension insulator chains 4, 4 are connected via energizing side hanging fittings 5, 5. The connecting yoke 6 is connected by connecting pins 9, 9, and a pair of left and right suspension insulator chains 4,
4 is installed in an almost V-shape. A power transmission line L is supported at the center of the connection yoke 6 via a connection link 7 and a wire clamp 8 .

[0008] A discharge electrode 10 on the energized side is supported by the one (left side in FIG. 1) energized side hanging fitting 5 . This discharge electrode 10 has a base end portion 10a that is fixed through the power supply side hanging fitting 5 and extends in the line direction, and a base end portion 10a that extends in the line direction.
The arc-shaped discharge portion 10b also extends in the line direction. The arcuate discharge portion 10b is located in a virtual plane passing through the central axis O of the left suspension insulator chain 4 and extending in the track direction, and is formed in an arcuate shape convex diagonally downward.

[0009] Arc horns 11 and 12 for protecting the suspended insulator chain 4 are supported on the ground side hanging metal fitting 3 and the energizing side hanging metal fitting 5, respectively. The discharge electrode 10 on the power supply side also serves as the arc horn 12 on the left side in FIG. At the tip of the support arm 1, a mounting adapter 13 is supported toward the track direction as shown in FIGS. 2 and 3, and on the lower surface of the tip of the mounting adapter 13, there is a ground side provided at the upper end of the lightning arrester main body 14. The electrode fittings 15 are fixed with bolts. This lightning arrester main body 14 is made of FRP.
A pressure-resistant insulating cylinder (not shown) formed into a cylindrical shape by
A current-limiting element 17 housed inside this voltage-resistant insulating tube and mainly made of zinc oxide having non-linear voltage-current characteristics, and a current-limiting element 17 that is fitted and fixed to the upper end of the voltage-resistant insulating tube on the grounding side and the power supply side. It is composed of electrode fittings 15 and 16 and an insulating jacket 18 that is rubber-molded on the outside of the voltage-resistant insulating cylinder.

[0010] The electrode fitting 16 on the energizing side supports a grounding side discharge electrode 19 which faces the aforementioned energizing side discharge electrode 10 with a predetermined aerial discharge gap G therebetween. As shown in FIG. 1, this discharge electrode 19 passes through the base end 19a supported by the energized side electrode fitting 16 of the lightning arrester main body 14 and the central axis O of the suspension insulator chain 4 on the left side, and in the direction of the line. The rod-shaped discharge portion 19b is supported in an inclined state so as to be perpendicular to the oriented virtual plane. Further, as shown in FIG. 3, this rod-shaped discharge section 19b is located near the center of the arc of the arc-shaped discharge section 10b on the power supply side, and the air gap between it and the tip of the arc-shaped discharge section 10b is defined as a discharge gap G. There is.

Note that 20 and 21 are arc rings for protecting the lightning arrester main body 14. Next, the operation of the lightning arrester for a V-suspended insulator constructed as described above will be explained. Now, when a lightning surge current due to a lightning strike flows through the power transmission line L, the current flows through the wire clamp 8, the connection link 7, the connection yoke 6, and the arc-shaped discharge portion 10 of the discharge electrode 10 on the power-supplying side.
From the tip of b, through the discharge gap G, the ground side discharge electrode 1
9, and is discharged to the steel tower via the electrode fitting 16, current limiting element 17, electrode fitting 15, mounting adapter 13, and support arm 1. Furthermore, the subsequent current that is about to flow is suppressed and interrupted by the restoration of the resistance value of the current limiting element 17 and the air discharge gap G, thereby preventing a ground fault from occurring.

Now, in the embodiment of the present invention, the arc-shaped discharge portion 10b of the discharge electrode 10 on the energizing side is shown in FIGS. 1 and 4.
As shown in , it extends in the track direction and is located in a virtual plane in the track direction that passes through the central axis O of the left suspension insulator chain 4,
On the other hand, the ground-side discharge electrode 19 is disposed perpendicular to the virtual plane and approximately near the center of the arc of the discharge section 10b as shown in FIG. When the suspension insulator chain 4 swings in the left-right (track) direction as shown in FIG. 3 about the ground-side suspension fitting 3, even if the discharge electrode 10 on the energized side is displaced as shown by the chain line in the figure. , the aerial discharge gap G between both discharge electrodes 10 and 19 is kept constant.

Further, when the power transmission line 9 swings in the direction perpendicular to the line as shown in FIG. The discharge electrode 10 oscillates as shown by a substantially arcuate locus T centered at the upper suspension point P, but the discharge gap G between the tip of the arcuate discharge portion 10b of the discharge electrode 10 and the rod-shaped discharge electrode 19 on the ground side is remains almost constant. As a result, even if the power transmission line L swings, the discharge characteristics of the lightning arrester main body 14 are stabilized.

Note that the present invention can also be embodied as follows. In the embodiment described above, the lightning arrester main body 14 was placed in the center of both suspended insulator chains 4, 4, but this position may be placed closer to the tip of the support arm 1, or the lightning arrester main body 14 may be supported horizontally. You can also do that. Further, by forming the rod-shaped discharge portion 19b in an arc shape parallel to the arc locus T in FIG. 4, the aerial discharge gap G can be kept constant.

[0015]

Effects of the Invention As detailed above, the present invention maintains the air discharge gap between the discharge electrode on the energized side and the discharge electrode on the ground side even if the power transmission line swings in the line direction or in the direction perpendicular to the line. This has the effect of stabilizing the discharge characteristics of the lightning arrester by keeping it constant.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment embodying the present invention.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a left side view of FIG. 1.

FIG. 4 is an explanatory diagram showing the positional relationship of discharge electrodes when the power transmission line swings in a direction perpendicular to the line.

[Explanation of symbols]

1 Support arm, 2 Mounting bracket, 3 Grounding side hanging bracket, 4 Suspension insulator chain, 5 Loading side hanging bracket, 6 Connection yoke, 10 Loading side discharge electrode, 10b Arc-shaped discharge part, 13 Mounting adapter, 14 Lightning arrester main body, 19 Earthing side discharge electrode, 19b Rod-shaped discharge part, G Air discharge gap, L Power transmission line.

Claims (1)

[Claims] Claim 1: The upper ends of a pair of suspended insulator chains are connected to the support arm through ground side hanging fittings, and the energized side hanging fittings are respectively connected between the lower ends of both suspension insulator chains. Between the two energized side hanging fittings, the two suspension insulator chains are connected so as to be swingable in the direction of the line and in the direction perpendicular to the line, so as to form a substantially V-shape, and the connection yoke is connected to an electric wire. A power transmission line is supported via a clamp, and a lightning arrester main body is attached to the support arm via a mounting adapter,
On one of the two power-supplying-side hanging fixtures, an arc-shaped discharge electrode on the power-supplying side extends in substantially the same direction as the line direction, and the arc-shaped discharge part of the discharge electrode is extended diagonally. A rod-shaped discharge electrode is arranged in a downward convex shape along the suspension insulator link axis, and further faces the discharge electrode on the energized side with a predetermined aerial discharge gap with respect to the tip of the lightning arrester main body, A lightning arrester for a V-suspended insulator device, characterized in that the lightning arrester is disposed approximately perpendicular to a plane passing through the arcuate discharge portion and near the center of the arc of the arcuate discharge portion.