JPS61288316A - Hitting side discharge electrode for thunderproof horn insulator - Google Patents

Abstract

(57) [Summary] 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 Application Field) This invention is intended to quickly ground a large current caused by a lightning strike when it flows through a power transmission line, and to ground the power transmission line by the follow-on arc that occurs afterwards. The present invention relates to a charging side discharge electrode in a lightning protection horn insulator device for an overhead power transmission line to prevent melting.

(Prior Art) Conventionally, as a device for installing a lightning arrester insulator with a predetermined air discharge gap to a power transmission line, there has been a lightning arrester device as shown in the sixth centroid.

Roughly speaking, this device has an electric wire 5 supported at the lower end of a hanging insulator 6 suspended below the support arm 1 of the tower body, and a lightning arrester 7 attached to the side of the hanging insulator 6. It is something.

The lower cap fitting 31 of the hanging insulator 6 has an arc horn 25 as a discharge electrode on the energized side that is bent upward.
is attached. Further, a support metal fitting 33 extending laterally and having an upwardly bent tip is fixed to the upper cap metal fitting 32, and a lightning arrester 7 is tilted downward and cantilevered to the tip of the metal fitting 33. has been done. Further, an upper arc horn 25 is attached to the lower part of the lightning arrester 7 and is tilted downward as a discharge electrode on the ground side, and both the upper and lower arc horns 25.25 face each other with a predetermined air discharge gap G. are doing.

When an abnormally large current due to a lightning strike flows through the electric wire 5, it passes through the lower cap fitting 31 to both the upper and lower arc horns 2.
5.25, and flowed to the support arm 1 of the tower body through a nonlinear resistance element built into the lightning arrester 7. Furthermore, the subsequent arc generated thereafter was blocked by the above-mentioned aerial discharge gap G and the nonlinear resistance element.

(Problems to be Solved by the Invention) However, in the conventional device, the lower arc horn 25
Since it was mounted facing upwards, it was easy for snow to accumulate. For example, for 60,000V class electric wire, arc horn 2
A large snow cap with a diameter of 40 to 50 cm had formed around May. For this reason, there was a problem that not only the electrical characteristics of the arc horn 25 were reduced, but also the aerial discharge gap G was reduced. Further, since the lower arc horn 25 is oriented upward, there is a problem in that the mounting position of the lightning arrester 7 is restricted.

In view of the above-mentioned circumstances, this invention has been developed in a lightning horn insulator device that prevents snow caps from forming during snowfall, maintains an appropriate air discharge gap, and allows the lightning arrester to be installed in an appropriate position for stable installation. The purpose is to provide a power side discharge electrode.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention connects the mounting bracket 4 rotatably to the support arm 1 of the tower body, and the mounting bracket 4 A hanging insulator 6 for supporting the electric wire 5 is connected to the mounting bracket 4, and a lightning arrester 7 is also suspended and fixed to the mounting bracket 4.
In a lightning horn insulator device in which a discharge electrode on the energized side opposite to a discharge electrode provided at the lower part of the lightning arrester 7 is attached to the lower part of the hanging insulator 6, the end of the discharge electrode on the energized side is attached to the lower part of the suspension insulator 6.
A configuration is adopted in which the insulator is inclined downward from a plane that is perpendicular to the central axis of the hanging insulator 6 and passes through the base end of the discharge electrode on the energizing side.

(Operation) This invention operates as follows by employing the above means.

Snow that adheres to the discharge electrode due to snowfall moves along the discharge electrode to its tip due to its own weight and falls, thereby preventing snow capping. Therefore, an appropriate air discharge gap is ensured between the discharge electrode on the energized side and the discharge electrode at the lower part of the lightning arrester.

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

A bifurcated bearing member 2 is fixed to the lower surface of the tip of the support arm 1 of the tower body, and the bearing member 2 is rotatable only in a direction perpendicular to the railway line (hereinafter referred to as the perpendicular direction to the railway line) via a shaft 3. A mounting bracket 4 of the supported insulator is connected. A hanging insulator 6 supporting an electric wire 5 is suspended from one end of the mounting bracket 4, and a lightning arrester 7 is fixedly suspended from the other end.

The mounting bracket 4 includes a hanging link 8 that is attached to the shaft 3 and connected to the bearing member 2 so as to be rotatable in the left and right directions (arrows P and Q directions), that is, in a direction perpendicular to the track.
A horizontal support arm 10 is connected to a lower end bearing portion 8a of the horizontal support arm 10 by a shaft 9 so as to be relatively rotatable in the vertical direction;
A connecting link 12 consisting of a turnbuckle is connected between a bearing member 10a welded to the bearing member 10a and a bearing member 8b welded to the hanging link 8 by a shaft 11.11 so as to be relatively rotatable in the vertical direction. The link mechanism is configured into an approximately triangular shape. The horizontal support arm 10 includes an arm piece 13 rotatably connected to the shaft 9, an arm piece 15 connected to the arm piece 13 by a locking shaft 14, 14, and
It is formed by a mounting plate 16 welded to the tip of the arm piece 15.

The horizontal support arm 10 of the mounting bracket 4 has an arm piece 13
A plurality of holes 13a of the locking shaft 14 are provided in the longitudinal direction of the
The length of the arm 10 can be adjusted by changing the corresponding positions of the same locking shafts 14 provided in the longitudinal direction of the arm pieces 15 with holes (not shown). A right-angled clevis link 17 is welded to the lower surface of the base end of the arm piece 13, and a shaft 18 allows relative rotation in a direction perpendicular to the rotation direction of the hanging link 8, that is, in the track direction. The cap fitting 20 of the hanging insulator 6 is connected to the
are also connected by a shaft 18 so as to be relatively rotatable in the track direction. The hanging insulator 6 is configured to be able to swing in a direction perpendicular to the track while remaining perpendicular to the horizontal support arm 10.

Further, the mounting plate 16 is provided with an upper electrode 7 of the lightning arrester 7.
a is fastened with a bolt, and the lightning arrester 7 is attached so as to be perpendicular to the horizontal support arm 10 and parallel to the hanging insulator 6.

A flat revis 21 as a lower metal fitting is attached to the lower part of the hanging insulator 6, and a horn mounting metal fitting 23 also as a lower metal fitting is attached to the horizontal revis 21 so as to be relatively rotatable in the track direction by a shaft 22. A suspension clamp 24 is connected to the lower part thereof by a shaft 22 so as to be relatively rotatable in the track direction. Further, an arc horn 25 serving as a discharge electrode on the energizing side of the present invention is attached to the horn mounting bracket 23 in a direction perpendicular to the line. This arc horn 2
5 is curved so that its tip is directed downward, is attached to the lower electrode 7b of the lightning arrester 7, extends in the line direction, and is curved in a semicircular arc shape centered on the shaft 18. It faces the discharge electrode 26 with a predetermined aerial discharge gap G therebetween.

Next, the operation of the charging side discharge electrode in the lightning horn insulator device configured as described above will be explained.

Now, when snow begins to fall, snow begins to accumulate on the arc horn 25 of the insulator device and also begins to fall from the hanging insulator 6, as shown in FIG. At this time, arc horn 25
Since the tip of the snow 27 is curved and directed downward, the snow 27 not only slides down on the arc horn 25 due to its own weight, but also vibrates due to the wind pressure applied to the insulator device and minute electric wires 5 due to high voltage current. The snow pile 27 reliably slides under the vibration. As a result, a large snow cap is not formed on the arc horn 25, and the electrical characteristics of the arc horn 25 and the air discharge gap G are maintained appropriately.

In addition, when installing a lightning arrester 28 that is longer than the existing lightning arrester 7 in order to increase the discharge resistance and staining characteristics of the lightning arrester 7, as shown in FIG. A predetermined air discharge gap G can be secured by simply extending the lightning arrester 28 downward without changing the clearance C between the lightning arrester 28 and attaching the arc horn 25 having a large inclination angle θ. Therefore, the lightning arrester 28 can be stably installed.

Note that when the load balance of the electric wire 5 changes due to snow accumulation and the like and the electric wire 5 swings in the direction of the track, the breakage of the electric wire 5 acts on the hanging insulator 6 via the suspension clamp 24, as shown in FIG. Only the hanging insulator 6 swings in the track direction (arrows R, S) while the mounting bracket 4 and the lightning arrester 7 hang stationary.

In this state, the hanging insulator 6 is connected to the right angle clevis link 17.
The arc horn 25 at the bottom of the hanging insulator 6 moves in an arc shape about the shaft 18, and is approximately aligned with the curved creeping surface of the discharge electrode 26 at the bottom end of the lightning arrester 7. Due to the corresponding movement, the air discharge gap G remains approximately constant. Furthermore, no unreasonable force is generated that may cause twisting of the mounting bracket 4 or the lightning arrester 7.

Furthermore, when the electric wire 5 swings in the direction perpendicular to the line due to strong winds, the hanging insulator 6 and the lightning arrester 7 can be photographed in the same direction while remaining parallel, so that the air discharge gap between the arc horn 25 and the discharge electrode 26 is reduced. G is always held constant. Also, at this time,
The load on the lightning arrester 7 does not exert a torsional effect on the mounting bracket 4 and the hanging insulator 6 due to the limited rotation of the mounting bracket 4 in one direction, that is, the rotation within the same plane in the vertical direction. , deformation of the mounting bracket 4 and the hanging insulator 6 is prevented, and durability is improved. As a result of this, arc horn 25
Changes in the air discharge gap G between the discharge electrode 26 and the discharge electrode 26 are prevented.

By the way, when an abnormally large current due to a lightning strike flows through the electric wire 5, the current is discharged in the air discharge gap G between the arc horn 25 and the discharge electrode 26, and the nonlinear resistance element built in the lightning arrester 7 is It then flows to the support arm 1 of the tower body. Furthermore, the subsequent arc generated thereafter is blocked by the air discharge gap G and the nonlinear resistance element.

Note that the mounting bracket 4 of this device is attached to the horizontal support arm 1.
The lengths of the two sides of the triangular link mechanism can be adjusted by the arm piece 13 of 0 and the connecting link 12. Therefore, in order to install this device on the support arm 1 of the i-tower body, first, the length of the horizontal support arm 10 is adjusted, and the clearance C1 between the hanging insulator 6 and the lightning arrester 7 is adjusted.
Set the air discharge gap G. Next, by adjusting the length of the connecting link 12 to horizontally correct the horizontal support arm 10, which tilts from side to side due to the load of the electric wire 5 that changes depending on each tower body, the hanging insulator 6 and lightning arrester in a stationary state can be adjusted horizontally. The insulators 7 can each hang perpendicularly to the horizontal support arms 10 of the mounting bracket 4.

Moreover, this invention can also be implemented as follows.

As shown in FIG. 4, the tip of the arc horn 25 may be formed into three branches, or as shown in FIG. 5, it may be formed into a T-shape.

In this alternative example, the horizontal width of the arc horn 25 is secured, so that even when the hanging insulator 6 swings laterally, the air discharge gap between the end of the arc horn 25 and the discharge electrode 26 can be maintained, as shown in FIG. It can be guaranteed.

Effects of the Invention As described in detail above, in this invention, the discharge electrode on the energizing side is curved so as to point downward, so that snow caps are not generated in response to snowfall. Not only can the discharge gap be maintained, but even if the lightning arrester becomes long, it has an excellent effect of being able to stably erect the same.

[Brief explanation of drawings]

Fig. 1 is a front view of an insulator device showing an embodiment embodying the present invention, Fig. 2 is a partially enlarged view of Fig. 1, Fig. 3 is a side view showing the operating state, and Figs. 4.5 are FIG. 6 is a perspective view showing another example of an arc horn, and FIG. 6 is a front view showing a conventional example. DESCRIPTION OF SYMBOLS 1... Support arm, 2... Bearing member, 4... Mounting bracket, 5... Electric wire, 6... Hanging insulator, 7... Lightning arrester, 8... Hanging link, DESCRIPTION OF SYMBOLS 10... Horizontal support arm, 12... Connection link, 17... Right angle clevis link, 25... Arc horn, 26... Discharge electrode, C
...Clearance, G...Air discharge gap, θ...
Tilt angle.

Claims (1)

[Claims] 1. A mounting bracket (4) is rotatably suspended and connected to the support arm (1) of the tower body, and the mounting bracket (4) is connected to an electric wire (
A suspension insulator (6) is connected to support the suspension insulator (6), and a lightning arrester (7) is also suspended and fixed to the mounting bracket (4), and a lightning arrester (7) is connected to the lower part of the suspension insulator (6). 7) In a lightning-proof horn insulator device in which a discharge electrode on the energized side opposite to the discharge electrode provided at the lower part is attached, the end of the discharge electrode on the energized side is aligned with the central axis of the hanging insulator (6). A charging side discharge electrode in a lightning protection horn insulator device, characterized in that the charging side discharge electrode is inclined downward from a plane that is perpendicular to the plane and passes through the base end of the charging side discharge electrode. 2. The lightning protection device according to claim 1, wherein the discharge electrode on the energizing side is an arc horn (25) extending horizontally from the lower part of the hanging insulator (6) and having a curved tip and directed downward. A discharge electrode on the energized side of a horn insulator device. 3. The charging side discharge electrode in the lightning horn insulator device according to claim 1, wherein the charging side discharge electrode is an arc horn (25) formed by branching into three branches at its tip. 4. The charging side discharge electrode in the lightning horn insulator device according to claim 1, wherein the charging side discharge electrode is an arc horn (25) having a T-shaped tip. 5 The discharge electrode attached to the lower part of the lightning arrester (7) extends in the line direction and is formed in a semicircular arc shape.
The charging side discharge electrode in the lightning horn insulator device described in 2.