JPH0250568B2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) This invention provides a method for quickly grounding high voltage caused by lightning when it is applied to a power transmission line, and
The present invention relates to a lightning horn insulator device for an overhead power transmission line to prevent the power transmission line from being fused due to subsequent arcing.

(Prior Art) Conventionally, there has been a device as shown in FIG. 5 as a device for installing a lightning arrester insulator with a predetermined air discharge gap to a power transmission line.

To explain this device, a hanging insulator 32 is connected to a U bolt 31 attached to a support arm 1.
A U clevis 34 attached to an upper cap metal fitting 33 is rotatably suspended. An electric wire 5 is supported at the lower end of the hanging insulator 32 via a suspension clamp 36 attached to a lower cap metal fitting 35, and a lower arc horn bent diagonally upward is attached to the lower cap metal fitting 35. 37 is attached. Further, a supporting metal fitting 38 extending laterally is fixed to the upper cap metal fitting 33, and a lightning arrester 39 is slanted and suspended from the tip of the metal fitting 38. Further, an upper arc horn 40 is attached to the lower electrode 39a of the lightning arrester 39 and is inclined downward and faces the lower arc horn 37 with a predetermined air discharge gap G therebetween.

(Problems to be Solved by the Invention) However, in the conventional device, the lightning arrester 39 is installed in an inclined state with respect to the support fitting 38, and a predetermined aerial discharge gap G is formed between both the arc horns 37 and 40. Since it is necessary to take lightning arrester 3.
9 is arranged close to horizontal and protrudes in the direction perpendicular to the line, and the dimension in the same direction becomes large, resulting in an increase in the size of the insulator device, and there is also a problem in that it gives an unnatural appearance. Furthermore, since the hanging insulator 32 is suspended from the support arm 1 of the tower body via the U bolt 31 and the U clevis 34, the hanging insulator 32 can be rotated in the track direction and in the direction perpendicular to the track. When the electric wire 5 sways in strong winds or the device itself receives wind pressure, the lightning arrester 39 and the hanging insulator 32 swing irregularly in the direction of the line and in the direction perpendicular to the line. As a result, the bending load due to the swinging of the lightning arrester 39 acts on the hanging insulator 32 as an irregular twisting force via the support fitting 38, and the mechanical strength of the supporting fitting 38 and the hanging insulator 32 is reduced. There was a fear that it would be reduced. Further, due to the deformation of the support fitting 38, the air discharge gap G expands, and the insulation strength of the gap G becomes greater than the insulation strength of the hanging insulator 32, causing a flashover in the hanging insulator 32, or There was also a fear that the discharge gap G would be narrowed and a discharge would occur due to switching surges.

In view of the above-mentioned circumstances, the present invention has been developed in such a way that the aerial discharge gap is maintained in a stable installation state, without the occurrence of swinging of the wire, wind pressure, or irregular swinging, and by changing the positional relationship between the hanging insulator and the lightning arrester. To provide a lightning protection horn insulator device which discharges an abnormally high voltage caused by lightning between both discharge electrodes even if the length changes, and does not impair the function of the lightning protection insulator.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention suspends and connects the mounting bracket 3 to the support arm 1 of the tower body so as to be rotatable in a direction perpendicular to the railway line. and said mounting bracket 3
A hanging insulator 6 for supporting the electric wire 5 is connected and suspended so as to be rotatable in the same direction and in a direction perpendicular to the rotating direction of the mounting bracket 3. A lightning arrester 7 is suspended and fixed on the side opposite to the tower body, and a discharge electrode 20 on the energized side extending laterally via a lower metal fitting is provided at the lower part of the suspension insulator 6, and the lightning arrester Discharge electrode 2 attached to the bottom of the insulator 7
2 and the discharge electrode 20 on the energized side are opposed to each other with a predetermined aerial discharge gap G, and the discharge electrode 20 on the energized side
A configuration is adopted in which the tip of the insulator is positioned outward on the opposite side from the hanging insulator 6 with respect to the perpendicular line H passing through the discharge electrode 22, and is made to stand up from the horizontal surface.

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

When the hanging insulator swings in the direction perpendicular to the railway line due to swinging of the electric wire or wind pressure acting on the device, the lightning arrester swings in the direction perpendicular to the railway line together with the mounting bracket, slightly behind the swinging of the hanging insulator. Additionally, the hanging insulator can swing independently in the direction of the railroad tracks. Therefore, the hanging insulator is not deprived of its freedom of vibration due to the attachment of the lightning arrester, and no unreasonable torsional force is applied to the hanging insulator.

When the hanging insulator swings in the direction perpendicular to the line and toward the tower body due to the wind pressure applied to the wire, the lightning arrester swings with a slight delay, so the air discharge gap increases from the specified length, but The discharge electrode is located on the opposite side of the suspension insulator with respect to the perpendicular line passing through the discharge electrode of the lightning arrester, and is raised from the horizontal plane, so the tip of the discharge electrode on the energized side is located between the mounting bracket and the suspension insulator. Since it moves on a circular arc centered on the connecting part and approaches the perpendicular line, the air discharge gap widens only slightly, and the insulating strength of the gap does not exceed the insulating strength of the hanging insulator. Therefore, the abnormally high voltage caused by a lightning strike is always discharged in the air discharge gap and flows to the support arm of the tower body through the lightning arrester equipped with a non-linear resistance element. Further, the subsequent arc generated thereafter is blocked by the air discharge gap and the nonlinear resistance element.

When the air discharge gap swings in the opposite direction to the tower body, the air discharge gap tends to decrease, but by devising the shape of the discharge electrode on the energized side near the hanging insulator connection point, it is possible to set the gap at the initial stage. Therefore, the insulation strength will not decrease.

Also, even if the hanging insulator swings alone in the direction of the track,
Since the discharge electrode at the lower part of the lightning arrester has a certain length in the line direction, the above-mentioned aerial discharge gap can be kept constant.

(Example) Hereinafter, an example embodying this invention will be described in the first to
This will be explained in detail based on FIG.

There is a bracket 2 on the bottom surface of the tip of the support arm 1 of the tower body.
is fixed. Schematically speaking, the insulator device of this embodiment includes a mounting bracket 3 that is rotatably supported with respect to the bracket 2 only in the direction perpendicular to the track, and a mounting bracket 3 that is suspended from the center right side of the mounting bracket 3 and has an electric wire 5 connected thereto. A hanging insulator 6 constituted by a plurality of suspended insulators 6A to be supported, a lightning arrester 7 suspended and fixed to the tip of the mounting bracket 3, and a lightning arrester 7 attached to the base end of the mounting bracket 3, and the weight of the lightning arrester 7 The lightning arrester 7 is suspended vertically (in the direction of gravity) in a balanced manner and includes a weight 8 for preventing abnormal vibrations.

The mounting bracket 3 has four shafts attached to the bifurcated bracket 2 and is connected at right angles to a hanging link part 3A that is rotatably connected only in the left and right directions (directions of arrows P and Q), that is, in the direction perpendicular to the railroad tracks. Clevis 9 to axis 1
0, a hanging link part 3B that supports relative rotation in the direction orthogonal to the track, a mounting arm part 3C to which the mounting plate 11 of the lightning arrester 7 is fixed to the tip, and a mounting arm part 3D for mounting the weight 8. It is made up of.

A horn mounting bracket 1 is connected to the right angle clevis 9 by a shaft 12 so as to be relatively rotatable in a direction perpendicular to the rotation direction of the mounting bracket 3 (direction perpendicular to the track).
3, a cap fitting 14 of the hanging insulator 6 is connected by a shaft 12 so as to be relatively rotatable in the track direction.
The hanging insulator 6 is designed to be able to swing in the direction of the track and in the direction orthogonal to the track. Further, a pair of arc horns 15, 15 are attached to the horn mounting bracket 13. Furthermore, the mounting flange 7a of the lightning arrester 7 is fastened to the mounting plate 11 with bolts.

A parallel clevis 16 as a lower metal fitting is attached to the lower part of the hanging insulator 6.
A horn mounting bracket 18, which also serves as a lower bracket, is connected to the shaft 17 so as to be relatively rotatable in the track direction, and a suspension clamp 19 is connected to the shaft 1 below.
7 for relative rotation in the track direction. Further, an arc horn 20 as a discharge electrode on the energizing side and a pair of arc horns 21, 21 facing the arc horns 15, 15 are attached to the horn mounting bracket 18 by bolts (not shown) in a direction perpendicular to the line. has been done.

On the other hand, the shaft 1 is attached to the lower electrode 7b of the lightning arrester 7.
A discharge electrode 22 curved in an arc shape centered at 2 is attached to extend in the line direction, and faces the arc horn 20 with a predetermined air discharge gap G therebetween. The arc horn 20 is made of an integral member and is curved in an arc shape centered on a discharge electrode 22 provided on the lightning arrester 7, and has a bending point 20a inside the diameter of the suspension insulator 6A. 6, and the vicinity of this bending point 20a is set to have a gap length larger than the aerial discharge gap G in the initial state. In addition, the tip of the arc horn 20 is connected to a perpendicular line H (line in the direction of gravity) passing through the discharge electrode 22.
It extends outward from the ground and stands up from the horizontal plane. Note that this air discharge gap G is the distance where no discharge occurs between the arc horn 20 and the discharge electrode 22 due to opening/closing surges, and the air discharge gap G.
The distances are set such that the insulation strength of the hanging insulator 6 does not exceed the insulation strength of the hanging insulator 6.

Moreover, the lightning arrester 7 is provided above and below the lightning arrester 7.
Arcing rings 23, 23 are provided to surround the lightning arrester 7, so that when the lightning arrester 7 causes abnormal discharge due to a lightning surge, the arc jet is quickly transferred from the lightning arrester 7.

Next, the operation of the lightning horn insulator device configured as described above will be explained.

As shown in FIG. 2, when the electric wire 5 swings in a direction perpendicular to the line direction and away from the lightning arrester 7 due to strong winds, the swing of the electric wire 5 acts on the hanging insulator 6 via the suspension clamp 19. The hanging insulator 6 is connected to the shaft 10
It swings in the direction perpendicular to the railroad tracks (arrows P and Q) around the center. Along with this rotation of the hanging insulator 6, the lightning arrester 7
is rotated together with the mounting bracket 3 in the same direction about the shaft 4, and there is a slight difference (5 to 10 degrees) in the angle of inclination between the hanging insulator 6 and the lightning arrester 7, and the arc horn 20 It moves in a direction away from the discharge electrode 22. However, the tip of the arc horn 20 is connected to the hanging insulator 6 with respect to the perpendicular line H passing through the discharge electrode 22.
Since the arc horn 20 is extended to the opposite side and raised from the horizontal plane, the tip of the arc horn 20 approaches the perpendicular line H, and the aerial discharge gap G is only slightly widened, and the insulation strength of the gap G1 is increased. The insulation strength of the hanging insulator 6 will not be exceeded. Therefore, even if abnormal high voltage caused by lightning flows through the electric wire 5, this high voltage will be discharged in the air discharge gap G1 between the arc horn 20 and the discharge electrode 22, and will be discharged in the air discharge gap G1 between the arc horn 20 and discharge electrode 22. It flows via a linear resistance element to the support arm 1 of the tower body. In addition, the subsequent arc that occurs is
It is interrupted by the air discharge gap G1 and the non-linear resistance element.

Also, at this time, the lightning arrester 7 is rotated about the shaft 4 together with the mounting bracket 3 due to the effect of the vertical plumb 8, so the load on the lightning arrester 7 is applied to the mounting bracket 3 and the hanging insulator 6 due to the torsion. Since no action is exerted, deformation of the mounting bracket 3 and the hanging insulator 6 is prevented and durability is improved.

The electric wire 5 is perpendicular to the line direction, and the lightning arrester 7
In the case of swinging in a direction approaching , the air discharge gap G narrows slightly, contrary to the above case. However, because the shape of the area near the attachment point of the arc horn 20 to the hanging insulator 6 is devised and the gap length is set larger than the air discharge gap G in the initial state, the arc horn 20 is designed to have a gap length larger than the air discharge gap G. However, the decrease in gap length is offset by
No discharge occurs between the arc horn 20 and the discharge electrode 22 due to opening/closing surges.

In addition, as shown in FIG. 3, the load balance of the lightning wire 5 changes due to snow accretion on the wire 5, etc.
When the electric wire 5 swings in the direction of the line, the swing of the electric wire 5 acts on the hanging insulator 6 through the suspension clamp 19, and only the hanging insulator 6 moves in the direction of the line ( It swings in the direction of arrows R and S). In this state, the hanging insulator 6 is rotated around the shaft 12 of the right-angled clevis 9, the arc horn 20 at the bottom of the hanging insulator 6 moves in an arc around the shaft 12, and the lower end of the lightning arrester 7 Since the discharge electrode 22 moves approximately along the curved surface of the discharge electrode 22, the aerial discharge gap G is maintained approximately constant.
Furthermore, no unreasonable force that may cause twisting of the mounting bracket 3 or the lightning arrester 7 is generated.

Also, attach the arc horn 20 to the horn mounting bracket 18.
Since the insulator is connected to the insulator by bolts, there is no need to provide a separate mounting bracket or the like at the lower end of the hanging insulator 6, an increase in the length of the insulator can be prevented, and it is easy to apply to an existing insulator device.

Note that this invention may be implemented as follows.

(1) As shown in Fig. 4, the arc horn 20 as a discharge electrode on the energizing side is composed of a horizontal part 20b extending in a direction perpendicular to the line, and a tip inclined part 20c rising from the horizontal part 20b. to do.

(2) The arc horn 20 in the above embodiment is provided so that its position can be adjusted in the horizontal and vertical directions.

(3) Connecting the arc horn 20 to the arc horn 21 with bolts.

Effects of the Invention As detailed above, according to the present invention, the insulator device does not swing abnormally due to the vibration of the electric wire, so no excessive force is applied to the hanging insulator or its mounting bracket, and the durability of the device is improved. In addition, compared to the conventional insulator device in which the lightning arrester is attached to the hanging insulator by extending it in an inclined manner, the dimensions of the device in the direction perpendicular to the line are smaller, making the device more compact and environmentally friendly. be able to. In addition, the tip of the discharge electrode on the energizing side provided on the suspension insulator is extended to the opposite side of the suspension insulator with respect to the perpendicular line of the discharge electrode provided on the lightning arrester, and is raised from the horizontal plane, so that The amount of change in the air discharge gap due to the delay between the swing of the lower insulator and the swing of the lightning arrester can be reduced, and therefore the insulation strength of this air discharge gap will not exceed the insulation strength of the hanging insulator, preventing lightning strikes. An excellent effect is that the resulting abnormal high voltage can always be discharged in the air discharge gap.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment embodying the present invention, Fig. 2 is a front view showing an operating state, Fig. 3 is a side view showing an operating state, and Fig. 4 is a discharge electrode on the energized side. FIG. 5 is a front view showing another example. FIG. 5 is a front view showing a conventional example. DESCRIPTION OF SYMBOLS 1... Support arm, 2... Bearing member, 3... Mounting bracket, 4... Shaft, 5... Electric wire, 6... Hanging insulator, 7... Lightning arrester, 8... Weight, 20... Arc horn as a discharge electrode, 22...discharge electrode,
G, G1...Air discharge gap, H...Perpendicular line.

Claims (1)

[Scope of Claims] 1. A mounting bracket 3 is suspended and connected to the support arm 1 of the tower body so as to be rotatable in a direction perpendicular to the railway line, and the mounting bracket 3 has a suspension for supporting the electric wire 5. The insulator 6 is connected and suspended so as to be rotatable in the same direction and in the direction perpendicular to the rotating direction of the mounting bracket 3, and a lightning arrester 7 is also attached to the mounting bracket 3 on the side opposite to the tower body of the hanging insulator 6. A discharge electrode 20 on the energized side is provided at the lower part of the hanging insulator 6 and extends laterally via a lower metal fitting, and the discharge electrode 22 is attached to the lower part of the lightning arrester 7. and the discharge electrode 20 on the energizing side face each other with a predetermined air discharge gap G, and the tip of the energizing side discharge electrode 20 is suspended from the insulator 6 with respect to the perpendicular line H passing through the discharge electrode 22. A lightning-resistant horn insulator device characterized in that it is located outwardly on the opposite side and is raised from a horizontal surface. 2 The discharge electrode 20 on the energizing side is constituted by an integral member so as to have a bending point 20a inside the diameter of the suspension insulator 6A constituting the suspension insulator 6, and
A lightning horn insulator device according to claim 1, which is connected to a lightning horn insulator device. 3 The discharge electrode 20 on the energizing side is attached to the horn mounting bracket 18 as the lower bracket, or the same horn mounting bracket 1.
The lightning horn insulator device according to claim 1, which is bolted to an arc horn 21 attached to a lightning horn insulator device.