JPS63108620A - Arresting insulator for transmission line - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Purpose of the Invention (Industrial Field of Application) The present invention provides a method for detecting abnormally large currents flowing through power transmission lines due to lightning strikes.
The present invention relates to a lightning insulator device for power transmission lines that can quickly discharge lightning to the ground through its protection function, suppress and interrupt follow-on current, and prevent permanent ground faults.

(Prior Art) Conventionally, as shown in FIG. 4, as a lightning arrester device for a power transmission line, a hanging insulator 4 for a power transmission line 9 is attached to a support arm 1 of a steel tower.
1, and a lightning arrester 42 is suspended and fixed at a position separated from the suspension insulator 41 by a predetermined distance, and between a pair of discharge electrodes 43 attached to the lower ends of the suspension insulator 41 and the lightning arrester 42. There was one in which a predetermined discharge gap G was provided.

(Problems to be Solved by the Invention) However, in the conventional lightning arrester device for power transmission lines, since the lightning arrester 42 is suspended and fixed on the lower surface of the support arm 1,
It is difficult to secure a safe working distance between the tower body and the charged end of the lightning arrester, and in order to ensure this, it is necessary to increase the protruding length of the arm, and it is difficult to maintain a safe separation distance between the tower body and the charged end of the lightning arrester. If it were to be used, the lightning arrester 42 would become longer, making it necessary to increase the distance between the upper and lower support arms 1.1, which would necessitate modifications to the tower body, making it impossible to use it with the existing power transmission line support insulator device. The problem was that it was difficult. Furthermore, if it is attempted to manufacture a long lightning arrester in one piece, the manufacturing method must be special, and there is a problem in that it is not possible to reduce costs. In addition, due to the hanging method, there was a problem in that the rain washing effect on the surface of the lightning arrester 42 was reduced.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention suspends a support insulator from a support arm of a steel tower via a hanging metal fitting on the ground side, and A power transmission line is supported at the lower end via a suspension fitting on the power supply side, and a first lightning arrester is attached from the tip of the support arm via a mounting adapter almost horizontally in the direction of the line, when viewed from the plane. A second lightning arrester is supported so as to be displaced outward from the position of the power transmission line, and a second lightning arrester is horizontally connected to the tip of the first lightning arrester via a connecting fitting so as to be displaced toward the tower body. , the angle formed by the center axes of both lightning arresters, that is, the mounting angle, is an obtuse angle, an arcing horn is provided at the tip of the second lightning arrester, and an arcing horn attached to the hanging fitting on the power supply side and the arcing horn are provided. The method is to provide a discharge gap between the two.

(Function) By adopting the above-mentioned means, the present invention functions as follows.

Since the first and second lightning arresters are mounted almost horizontally on the tip side of the support arm, an insulation gap between the lightning arrester and the tower body is secured, and the lightning arrester and the support arm located on the lower side are secured. Since the insulation interval between the insulator and the insulator is also secured, it can be easily applied to the existing power transmission line support insulator device.

Furthermore, since the second lightning arrester is connected to the first lightning arrester in an oblique manner, the rotational moment of the first and second lightning arresters acting on the mounting adapter connects the lightning arrester in a straight line. The mechanical reliability of the device can be improved.

Furthermore, since the second lightning arrester is closer to the support arm side, installation work and inspection work are easier than when the lightning arrester is connected in a straight line.

In addition, since the lightning arrester is supported almost horizontally, the rain washing effect is high and the staining property is improved.

(Example) Hereinafter, an example embodying the present invention will be described based on FIGS. 1 to 3.

As shown in FIG. 2, a connecting fitting 2 is fixed to the tip of the support arm 1 of the steel tower, and a suspension insulator 5 is connected in series to the connecting fitting 2 via a U clevis link 3 and a horn fitting 4. A suspension insulator chain 6, which serves as a support insulator, is supported so as to be swingable in the line direction and in the orthogonal direction. In this embodiment, the connecting fitting 2, the U clevis link 3, and the horn mounting fitting 4 constitute a hanging fitting on the ground side. A wire clamp 10 for supporting a power transmission line 9 is supported by a horn mounting bracket 7 at the lower end of the suspension insulator chain 6 via a connecting link 8. In this embodiment, the horn mounting bracket 7,
The connecting link 8 and the wire clamp 10 constitute a hanging metal fitting on the power supply side.

Arcing horns 11 and 12 are attached to the horn fittings 4 and 7 in order to reduce damage to the suspension insulator chain 6 caused by creeping flash as much as possible.

A mounting adapter 13 is fixed to the tip of the support arm l with a bolt, and a first lightning insulator 14 is attached to a plate-shaped mounting portion 13a vertically fixed to the tip of the adapter 13, and the first lightning insulator 14 is connected to its ground side electrode. It is cantilevered by bolts with a metal fitting 15 so as to be substantially horizontal in the direction of the line, and to be out of phase with respect to the line when viewed from above, as shown in FIG.

A connecting fitting 17 having a V-shape in plan is fixed with a bolt to the electrode fitting 16 on the power supply side located at the tip of the first lightning arrester 14, and a second lightning arrester 18 is attached to the connecting fitting 17. The electrode fittings 19 on the ground side are connected substantially horizontally by bolts. The angle between the central axis 02 of the second lightning arrester 18 and the central axis 01 of the first lightning arrester 14, that is, the mounting angle α of both the lightning arresters 14 and 18, forms an obtuse angle as shown in FIG. , and the second lightning arrester 18 is supported so as to face toward the steel tower. Further, an arcing horn 21 is supported by an electrode fitting 20 on the power supply side located at the tip of the second lightning arrester 18 .

On the other hand, as shown in FIG. 1, an arcing horn 22 is cantilever-supported by bolts on the horn mounting bracket 7 in the direction of the track, and a predetermined air discharge is caused between the arcing horn 22 and the arcing horn 21. A pJG is provided between the two. As shown in FIG. 3, the tip of the arcing horn 21 is formed in an arc shape so as to be convex downward when viewed from the line direction, and the arcing horn 22 is formed on a perpendicular line H passing through the center of the arc portion 21a. Make sure the tip is in place. Even if the suspension insulator chain 6 swings in the direction perpendicular to the line in FIG. 3 (in the left-right direction in FIG. 3), the discharge gap G is maintained substantially constant. In addition, as shown in FIG. 2, the tip of the arcing horn 21 is formed in a substantially arc shape when viewed from the direction perpendicular to the line, and the discharge gap G remains almost constant even when the vertical insulator chain 6 swings in the line direction. I try to keep it in place.

The first M lightning insulator 14 includes a voltage-resistant insulating cylinder (shown in the diagram) formed in a cylindrical shape from a tensile material such as FRP, and a voltage-resistant insulating cylinder whose main material is zinc oxide (ZnO) housed in series therein. - a lightning arrester with non-linear current characteristics (path shown); cap-shaped electrode fittings 16 and 15 on the power side and grounding side that are fitted and fixed to both ends of the voltage-resistant insulating tube; and the voltage-resistant insulating tube It is integrally formed with a rubber mold 23 provided on the outer periphery of the rubber mold 23. Further, the second lightning arrester 18 is also formed in the same manner as the first lightning arrester 14.

Note that an arcing ring 24 is provided on the mounting portion 13a of the mounting adapter 13, the connecting fitting 17, and the energized side electrode 20 of the second lightning arrester 18 to reduce damage to the rubber mold 23 during creeping flash. Two of them are attached to the lightning arrester, for a total of four.

Next, the operation of the lightning arrester device for power transmission lines constructed as described above will be explained.

Now, if an abnormally large current is applied to the power transmission line 9 due to a lightning strike,
This current is applied to the wire clamp 10. is discharged from the arcing horn 22 through the discharge gap G to the arcing horn 21,
The flow flows from the electrode fitting 20 to the lightning arrester element (path shown) of the second lightning arrester 18, and the electrode fitting 19, the connecting fitting 17, and the electrode fitting 1
6. It flows to the support arm l via the lightning arrester element (path shown) of the first lightning arrester 14, the electrode fitting 15 and the mounting adapter 13, and further flows to the steel tower and is discharged to the ground. Subsequent currents that occur thereafter are suppressed and blocked by the lightning arrester.

Now, in the above embodiment, as shown in FIG. 1, the first lightning arrester 14 is supported with respect to the support arm 1 in the direction of the line and in a manner that the phase is different from the line outward from the line when viewed from the plane.
A second lightning arrester 18 is connected to the tip of the first lightning arrester 14 via a connecting fitting 17 along their central axis 01.0.
2 intersect at an obtuse angle α and are supported in a nearly horizontal direction, the line voltage is thick (and even if the lightning arrester becomes larger and longer, the above-mentioned distance between the lightning arrester and the tower body and the lightning arrester The distance between the insulator and the support arm located on the lower side does not become small, and therefore, it can be easily applied to an existing power transmission line support insulator device.

In addition, since the center of gravity of the second lightning arrester approaches the mounting adapter side, the amount of lightning generated around the mounting adapter I3 is smaller than when the first and second lightning arrester are connected in series. The rotational moment can be reduced and mechanical reliability can be improved, and since the second lightning arrester 18 is close to the support arm 1, pole mounting work and inspection work are facilitated.

Even if the suspension insulator chain 6 oscillates due to loads such as wind pressure or snow caps acting on the power transmission line 9, it oscillates independently of the lightning arrester 14, so that no unreasonable external force is applied to the mounting adapter 13. , deformation of the adapter 13 and damage to the lightning arrester 14 can be prevented. Further, in this embodiment, since the tip of the arcing horn 21 is made into a circular arc portion 21a, the suspension insulator chain 6
Even if the arcing horns 21 and 22 oscillate, the discharge interval B between both arcing horns 21 and 22
Since G is held substantially constant, discharge characteristics can be stabilized and reliability can be improved.

Furthermore, in the embodiment of the present invention, the first and second lightning arrester 14
．． 18 is supported substantially horizontally, rain washing action is promoted and soiling characteristics can be improved.

Note that the present invention is not limited to the above embodiments (
For example, the first lightning arrester 14 and the second lightning arrester 18 may be arranged so that the mounting angle α is approximately 90'', or the tip of the mounting adapter 13 may be displaced to the right in FIG. etc., it is also possible to make any changes and embodiments within the scope of the claims.

Effects of the Invention As detailed above, the present invention ensures an insulation gap between the lightning arrester and the tower body, and also ensures an insulation gap between the lightning arrester and the support arm located below. This has the advantage that it can be easily applied to existing power transmission line support insulator devices. Further, the rotational moment of the second lightning arrester acting on the mounting adapter is smaller than that in the case where the lightning arresters are connected in a straight line, and the mechanical reliability of the device can be improved. Furthermore, installation work and inspection work can be performed more easily than when lightning arresters are connected in a straight line. In addition, there is an effect that the definition effect is high and the skillful hitting characteristics can be improved.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment embodying this invention;
FIG. 2 is a front view, FIG. 3 is a right side view, and FIG. 4 is a front view of a conventional example. DESCRIPTION OF SYMBOLS 1...Support arm, 6...E insulator chain as a support insulator, 9...Power transmission line, 13...Mounting adapter, 1
4...First lightning arrester, 17...Connection fitting, 18.
...Second lightning arrester, 21.22...Arching horn, G...Discharge gap.

Claims (1)

[Claims] 1. A support insulator is suspended from a support arm of a steel tower via a suspension fitting on the grounding side, and a power transmission line is attached to the lower end of the support fitting via a hanging fitting on the energized side. The first lightning arrester is supported from the tip of the support arm via a mounting adapter so as to be displaced substantially horizontally in the direction of the line and outward from the position of the power transmission line when viewed from a plane. The second lightning arrester is horizontally connected to the tip of the first lightning arrester via a connecting fitting so as to be displaced toward the tower body, and the angle formed by the center axes of both lightning arresters, that is, the mounting angle, is an obtuse angle. A power transmission line characterized in that an arcing horn is provided at the tip of the second lightning arrester, and a discharge gap is provided between the arcing horn attached to the hanging fitting on the power supply side and the arcing horn. lightning arrester device. 2. A patent claim in which the tip of the arcing horn attached to the lightning arrester is a downwardly convex circular arc when viewed from the line direction, and the tip of the arcing horn on the energized side is positioned on a perpendicular line passing through the center of the arc. A lightning arrester device for a power transmission line according to item 1.