JPH03187113A - Lightning horn insulator device - Google Patents

Abstract

PURPOSE:To miniaturize a device by placing the tip of a pair of arc-inducing horns at almost symmetrical positions to the side and retaining a preset clearance longer than a gap for an aerial discharge in the space thereof to a discharge electrode on the grounding side. CONSTITUTION:A suspended insulator is suspendedly connected to the supporting arm 1 of a column via an upper connection to support a wire 5. Arc-inducing horns on the charged side are formed by horns 25A, 25B, which have the tips placed at almost symmetrical positions to the side toward a wire passage, so that a clearance C3 between the arc-inducing horn on the charged side and the discharge electrode of a lightning insulator 8 can be made larger. When the whole device is oscillated by the effect of wire vibration and wind pressure, there is no occasion that this clearance C3 is smaller than an aerial discharge gap G. When abnormal voltage resulting from lightning is applied to the wire, current in such a case is discharged in the aerial discharge gap and flow through a non-linear resistance element built in the lightning insulator 8 into the supporting arm of the column. It is thus possible to realize a small-size and lighter-weight device.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention quickly discharges high voltage caused by lightning when it is applied to a power transmission line, cuts off the subsequent current, and permanently dissipates the voltage. The present invention relates to a lightning horn insulator device for overhead power transmission lines to prevent electrical shocks.

[Conventional technology]

Conventionally, there has been a device shown in FIG. 6, for example, as a device for installing a lightning arrester insulator with a predetermined air discharge gap with respect to a power transmission line.

The outline of this device is that a hanging insulator 3 is suspended via an upper connecting fitting 2 suspended below a support arm I of the tower body, and a lower connecting fitting 4 is attached to the lower end of this hanging insulator 3. Electric wire 5 through
is supported.

A lightning arrester 8 is cantilevered and fixed to the side of the hanging insulator 3 on the upper connecting fitting 2 via a mounting fitting 7.

Further, the lower connecting fitting 4 is provided with a charging side discharge electrode 27 extending to a position below the grounding side electrode 26 provided at the tip of the lightning arrester 8, and a predetermined air electrode gap G is provided. They are arranged to face each other.

A weight 10 is attached to the upper connecting fitting 2 via a mounting fitting 9 in a direction opposite to the mounting position of the lightning arrester 8 in order to balance the weight with the lightning arrester 8.

Further, the evacuation horns 44 and 45 are attached to the upper connecting fitting 2 and the lower connecting fitting 4, and are arranged to face each other with a clearance C2. Here, the energizing side summoning horn 45 is formed from a single rod, the base of which extends horizontally in the direction in which the lightning arrester 8 is disposed, and the tip end gently diagonally upward. is being formed towards. This allows the arc jet caused by creeping discharge to be moved to a position separated by light from the hanging insulator 3.

[Problem to be solved by the invention]

However, in the conventional device, the induction horn 45 on the energizing side is formed from a single rod and is placed facing the direction in which the lightning arrester 8 is installed. In order to sufficiently open the clearance C3 between the lightning arrester 8 and the electrode 26, it is necessary to arrange the lightning arrester 8 at a sufficiently distant position from the hanging insulator 3, which poses the problem of increasing the size of the entire device.

Furthermore, since the hanging insulator 3 can rotate both in the track direction and in the direction perpendicular to the track, if the hanging insulator 3 swings irregularly due to wind pressure, etc. As shown, the clearance C3 between the energizing-side conducive horn 45 and the discharge electrode 26 of the lightning arrester 8 is significantly narrowed, and a predetermined aerial discharge between the energizing-side discharge electrode 27 and the grounding-side discharge electrode 26 occurs. There was a risk that the distance could not be maintained larger than the distance G. At this time, if a vibration occurs that makes the clearance C3 particularly small, and an electric shock causes a discharge in the clearance C3 section, the insulation strength at the clearance 03 section is significantly reduced, so the follow-on current is blocked. However, it became impossible to restore the insulation, and the possibility of a ground fault occurring through this clearance C3 at normal power transmission voltage could not be ruled out. In addition, in order to reliably avoid this fear of ground faults, it is necessary to arrange the discharge electrode 26 with a sufficient distance from the hanging insulator 3, which poses the problem of increasing the size of the lightning arrester device. Ta.

[Means to accomplish the task]

In order to solve the above-mentioned problems, this invention connects a hanging insulator 3 to the support arm l of the tower body via an upper connecting fitting 2, and the hanging insulator 3 has a structure for supporting an electric wire 5. The electric wire clamp 6 is suspended and connected via the lower connecting fitting 4, and the upper and lower connecting fittings 2゜4 are equipped with a ground-side inducing horn 24 for inducing an arc jet due to creeping discharge, and a power-supplying side inducing horn 24. A lightning horn 25 is provided to face the side of the hanging insulator 3, and a lightning arrester 8 is provided on the upper connecting fitting 2 extending in the same direction as the lightning horn 24 on the grounding side. A discharge electrode 27 on the energized side is extended laterally to the lower connecting fitting 4, and the discharge electrode 27 and the discharge electrode 26 on the ground side provided at the tip of the lightning arrester 8 are connected to each other in a predetermined manner. In the lightning horn insulator device which faces each other with a medium discharge gap G, the lightning horn 25 on the energizing side is formed by a pair of horns 25A and 25B, and the tips of the horns 25A and 25B are placed at substantially symmetrical positions laterally. a predetermined clearance C that is longer than the air discharge gap G between the disposed and the ground side discharge electrode 26;
A configuration is adopted in which 3 is maintained.

[Effect]

By employing the above means, the present invention operates as follows.

The device can be easily implemented since it is only necessary to replace the sowing horn with the existing insulator device.

The lightning horn on the energizing side is formed by a pair of horns 25A and 25B, and the tip of each horn is placed at a substantially symmetrical position laterally with respect to the line direction, so that the inducing horn on the energizing side and the lightning protection The clearance C3 between the discharge electrodes of the insulator can be increased. In addition, when the entire device oscillates due to swinging of electric wires or wind pressure, etc., this clearance C
3 is never smaller than the air discharge gap G.

In addition, when abnormal voltage caused by lightning is applied to electric wires,
At this time, the current is discharged in the air discharge gap and flows to the support arm of the tower body through a nonlinear resistance element built into the lightning arrester. Furthermore, the subsequent arc generated thereafter is blocked by the air discharge gap and the nonlinear resistance element.

〔Example〕

Next, an embodiment embodying the present invention will be described based on FIGS. 1 to 5.

Fig. 1 schematically shows the lightning horn insulator device of this embodiment. A hanging metal fitting ti is fixed to the support arm l of the tower body with a mounting bolt, and a U clevis 12 is rotatable to this hanging metal fitting it. is connected to.

An upper connecting fitting 2 for connecting the hanging insulator 3 is connected to this U clevis 12. The connecting fitting 2 is formed in the shape of a horizontally long substantially rectangular plate, and its central upper portion is connected by a shaft 13 so as to be rotatable in the track direction (left-right direction in FIG. 1). At the lower center of this connecting fitting 2 is a shaft I.
4, the right angle clevis link 15 is connected to the right angle clevis link 15 so as to be relatively rotatable in the track direction.
A hanging insulator 3 is connected and suspended via a ball clevis 17 which is connected by a ball clevis 6 so as to be relatively rotatable in a direction perpendicular to the track.

A socket clevis I8 is attached to the lower part of the hanging insulator 3, and a lower connecting fitting 4 is connected to this socket clevis 18 by a shaft 19 so as to be relatively rotatable in the track direction.

A wire clamp 6 that supports the wire 5 is connected and suspended below the connecting fitting 4 via a right-angled clevis link 21 connected by a shaft 20 so as to be relatively rotatable in the line direction.

On the left side of the upper connecting fitting 2 and the lower connecting fitting 4, a grounding-side induction horn 22 and a power-supplying side induction horn 23 are respectively extended and mounted facing each other with a predetermined clearance C1. Furthermore, a grounding-side induction horn 24 and an energization-side induction horn 24 extend also to the right side of the connecting fittings 2 and 4, respectively.

The voltage - is connected to the right side of the upper connecting fitting 2 through the mounting fitting 7.
A lightning arrester 8 having a built-in lightning arrester element with non-linear current characteristics is tilted downward and fixed in a cantilevered manner. The lightning insulator 8
An arc horn 26 serving as a discharge electrode is provided at the tip of the arc horn 26 and is spaced apart from the hanging insulator 3 with a predetermined clearance C3. The arc horn 26 is attached in a curved manner in an arc shape centered on the shaft 16 in a direction perpendicular to the line. Further, a weight lO for maintaining weight balance with the lightning arrester 8 is attached to the left side of the upper connecting fitting 2 via a mounting fitting 9.

As shown in FIGS. 2 and 3, the lower connecting fitting 4 is formed into a horizontally long substantially rectangular plate shape, and the socket clevis 18 is connected to the socket clevis 18 by the shaft 19 at the upper center thereof, as described above.
and is also connected by shaft 20 to right angle clevis link 21
are connected. On the left side of this connecting fitting 4, there are mounting holes 28a, 28 for mounting the call horn 23.
b is formed, and on the right side a pair of horns 25A, 25
A beckoning horn 25 and an arcing horn 27 composed of B
Attachment holes 29a and 29b are formed for attaching. The summoning horn 23 has mounting holes 23a and 2 on its base end side.
3b and the attachment hole 28a of the connecting fitting 4.

They are clamped and fixed by inserting mounting bolts 30a, 30b through 28b and tightening mounting nuts 31a, 31b.

The horns 25A, 25B and the arc horn 27 have mounting holes 25a, 25b provided at their base ends.

27a, 27b and the attachment hole 29a for the connecting fitting 4.

29b and is fixed to the right side of the connecting fitting 4 by tightening the mounting bolts 32a, 32b and mounting nuts 33a, 33b. Arch horn 27. is extended horizontally in the line direction to a position below the ground side arc horn 26, and its tip is bent upward, and the arc horn 26
They are arranged opposite to each other with a predetermined air discharge gap G between them.

As shown in FIGS. 2 and 3, the horns 25A and 25B have a horizontal portion a extending horizontally perpendicular to the line direction, and a predetermined distance from the horizontal portion a to the lower end of the hanging insulator 3. When a diagonal portion is deviated by approximately 30 degrees with respect to the line direction while maintaining a gap and extends upward by approximately 45 degrees, a tip portion C extends horizontally from this diagonal portion. They are formed from respectively. As a result, horn 25A and horn 25B
is attached and fixed to the connecting fitting 4 so as to have a substantially V-shape in plan view, thereby forming a beckoning horn 25. The beckoning horn 25 formed in a substantially V shape is connected to the beckoning horn 24 on the grounding side.
Clearance C is almost the same as clearance CI for
2 are arranged facing each other, so that the arc jet generated during creeping discharge is quickly transferred to the tip of the induction horn 25.

In addition, the arcing horn 25 and the grounding side arcing horn 26 are connected to each other from the arcing horn 27 to the arcing horn 26 against lightning surges.
They are separated by a clearance C3 that is longer than the air discharge gap G so as to allow flashover to 6.

Next, the operation of the lightning horn insulator device of this embodiment will be explained.

A large load (approximately 1 t in the 60,000V class) of the downward electric wire 5 acts on the hanging insulator 3, which is suspended from the support arm l of the tower body and supports the electric wire 5, through the electric wire clamp 6. Therefore, in the stationary state of this device, the U clevis 12,
The upper connecting fitting 2, the hanging insulator 3, the lower connecting fitting 4, and the wire clamp 6 are suspended in series. In addition, the lightning arrester 8 placed on the right side of the upper connecting fitting 2 is connected to this connecting fitting 2.
It is balanced by a weight 10 placed on the left side of the frame, and suspended in a predetermined tilted state. Further, the energizing-side arcing horn 25 disposed on the right side of the lower connecting fitting 4, the energizing-side inducing horn 23 and the arcing horn 27 disposed on the left side of the connecting fitting 4 are held in a horizontal state. Ru. For this reason, the electric wire 6
When a lightning surge current enters, the current flashes over from the arc horn 27 to the arc horn 26 through the discharge gap G, passes through the lightning arrester 8, and is discharged from the support arm l of the tower body to the ground. Subsequent currents that occur thereafter are suppressed and interrupted by the action of the current limiting element housed in the lightning arrester 8, thereby preventing ground faults.

Also, as shown in FIG. 4, a horn 25A.

25B are provided offset by about 45 degrees with respect to the line direction, so in order to protect the hanging insulator 3 from arc jets generated during creeping discharge, each tip C is attached to the hanging insulator 3. Even if it is placed far enough away from the bottom side of the
Compared to the arc horn 45 of the conventional device, the arc horn 2
6 can be widened by the gap ΔH.

In addition, the induction horn 25 on the energizing side is formed in a substantially V-shape in plan, and the tips of each horn 25A, 25B are arranged at approximately symmetrical positions laterally with respect to the line direction, so that the electric field distribution is balanced. corona discharge is less likely to occur.

Further, when the electric wire 5 swings in the direction of the track due to strong winds, snow accumulation, etc., this insulator device also swings accordingly. When the electric wire 5 swings in the direction of the arrow P as shown in FIG. 5 in an exaggerated manner, the arc horn 27 extends almost horizontally, and its tip is bent upward. Since it is disposed below the arc horn 26, even if the hanging insulator 3 approaches the lightning arrester 8, the gap between it and the arc horn 26 will not become much shorter than the air discharge gap G. Therefore, a ground fault will not occur at normal power transmission voltage.

This embodiment device is constructed by attaching the lightning horn 25 on the power supply side to the existing lightning horn insulator device attached to the support arm l of the tower body. For the lightning arrester horn insulator device, since a sufficient clearance C3 can be secured between the lightning arrester 8 and the energizing horn 25, a configuration in which the lightning arrester 8 is placed closer to the hanging insulator 3 than in the conventional device is used. It is also possible to do this.

Moreover, this invention may be implemented as shown below.

(1) In this embodiment, the beckoning horn 25 is formed into a substantially V-shaped plane, but is not limited to this shape;
The beckoning horn 25 shall be in the shape of a letter.

(2) Corresponding to the energizing horn 25 on the power supply side, the inducing horn 24 on the grounding side should also be formed into a substantially V-shaped plane.

〔Effect of the invention〕

As detailed above, the present invention can be easily applied to existing lightning-protecting horn insulators, simplifying the construction work, and making it possible to reduce the size and weight of newly installed lightning-protecting horn insulators. It has excellent effects.

[Brief explanation of drawings]

1 to 5 show an embodiment of the present invention, in which FIG. 1 is a front view, FIG. 2 is a sectional view, FIG. 3 is an exploded perspective view of the mounting portion of each horn, and FIG. FIG. 5 is a front view showing a tilting state, and FIG. 6 is a front view showing a conventional example.

Claims (1)

[Claims] 1. A hanging insulator (3) is suspended and connected to the support arm (1) of the tower body via an upper connecting fitting (2), and the hanging insulator (3) is
A wire clamp (6) for supporting the electric wire (5) is suspended and connected via the lower connecting fitting (4), and the upper and lower connecting fittings (2, 4) are connected to an arc jet by creeping discharge. A grounding side inducing horn (24) and a energizing side inducing horn (25) are provided to face each other on the sides of the hanging insulator (3), and the upper connecting fitting (2) is provided with a lightning arrester (8) extending in the same direction as the ground-side induction horn (24), and the energized-side discharge electrode (27) is installed laterally on the lower connecting fitting (4). The same discharge electrode (2
7) and a grounding-side discharge electrode (26) provided at the tip of the lightning arrester (8) are opposed to each other with a predetermined aerial discharge gap G, wherein the lightning-protecting horn insulator device comprises: (25) with a pair of horns (25
A, 25B), and each horn (25A, 25
B) is arranged at substantially symmetrical positions laterally to maintain a predetermined clearance C3 longer than the air discharge gap G between the discharge electrode (26) on the ground side and the discharge electrode (26) on the ground side. Lightning resistant horn insulator device. 2. The upper connecting metal fitting (2) rotatably connects the hanging insulator (3), and the lower connecting metal fitting (4) is rotatably connected to the hanging insulator (3). The lightning horn insulator device according to claim 1, characterized in that: 3. The energizing side horn (25) has a horizontal part (a) extending in the horizontal direction perpendicular to the line direction and a horizontal part (
deviated from a) by about 30° with respect to the line direction, and about 45°
゜It is formed from a pair of horns (25A, 25B) consisting of a diagonal upper part (b) extending upward and a tip part (c) extending horizontally from the diagonal upper part (b), and has a flat surface. Abbreviation V
The lightning horn insulator device according to claim 1, wherein the lightning horn insulator device extends in a letter shape.