JPS61296609A - 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 (Field of Industrial Application) This invention is intended to quickly ground the abnormal high voltage caused by lightning when it is applied to a power transmission line, and to prevent the subsequent arcing from occurring. The present invention relates to a lightning horn insulator device for use in overhead power transmission lines to prevent melting of power transmission lines, particularly using tension insulators.

(Prior Art) Conventionally, as a device for installing a lightning arrester with a predetermined air discharge gap on a power transmission line, for example,
There was a device disclosed in Publication No. 8.

As shown in FIG. 12, this device fixes a tension-resistant insulator 3 that holds an electric wire 2 to a tower body 33, and connects a valve resistance element ( A lightning arrester 5 encapsulating a non-linear resistance element (non-linear resistance element) is integrally formed, and an electrode 42 provided at the tip of the same tension-resistant type insulator 3 and an electrode 43 provided at the tip of the lightning arrester 5 are connected in the air. They were configured to face each other with a distance of 114G between discharges.

(Problems to be Solved by the Invention) However, in the conventional device, the base end of the tension-resistant insulator 3 and the base end of the support fitting 41 are integrally formed, so that the existing tension-resistant insulator 3 and the base end of the support fitting 41 are integrally formed. It is difficult to attach the lightning arrester 5 using the lightning arrester 3 and configure the device.

Ta. In addition, stress concentration occurred in the tension-resistant insulator 3 and the support fitting 41 due to the bending moment due to the own weight of the lightning arrester 5.

Furthermore, since the lightning arrester 5 was installed with an offset relative to the tension type insulator 3, the attachment condition was 1. The structure was not symmetrical, and the installation condition of the device was unstable. Therefore, when the electric wire 2 sways in strong winds, the device swings irregularly, and bending loads and torsional forces act on the tension-resistant insulator 3, the support metal fittings 41, and the lightning arrester 5. .

Therefore, there was a risk that the mechanical strength of the device would decrease and that the air discharge gap G would change due to deformation of the support fitting 41 and the tension-resistant insulator 3.

In view of the above circumstances, this invention is applicable to existing tension type insulators, maintains the appropriate positional relationship between the tension type insulator and the lightning arrester in a stable installation state, and reduces the air discharge gap. To provide a lightning protection horn insulator device which can be maintained without impairing 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 connects a latch to the support arm 1 of the tower, and the latch has a tower side connecting metal. The tension insulator 3 is connected through the tension insulator 3, and the electric wire 2 is installed on the tension insulator 3 through the electric wire side connecting fitting.
A lightning arrester 5 is cantilever-fixed to the tower side connecting fitting via a mounting fitting 4A so as to be located above the tension insulator 3, and the lightning arrester 5 is also fixed to the tower side connecting fitting via a mounting fitting 4B. A weight 6 is suspended to maintain the lightning arrester 5 in a stable state in balance with the weight of the insulator 5, and a discharge electrode on the energized side is supported upward from the connecting fitting on the wire side. A configuration is adopted in which the discharge electrode attached to the tip of the insulator 5 and the discharge electrode on the energizing side face each other with a predetermined air discharge gap G2.

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

The device can be easily constructed by attaching the lightning arrester and the weight to the tower side connecting fittings of the existing tension insulators via mounting fittings.

Furthermore, when vibrations of electric wires, wind pressure, etc. act on the device, the device itself swings around the latching fittings. At this time, the lightning arrester swings following the tension insulator without maintaining balance with the weight, and no unreasonable stress concentration occurs in the mounting fittings, the tower body side connecting fittings, and the tension insulator. As a result, the air discharge gap between the discharge electrode on the energized side and the discharge electrode at the tip of the lightning arrester is maintained constant.

Furthermore, when an abnormally high voltage caused by a lightning strike is applied to a wire, the current is discharged in the air discharge gap, passes through a nonlinear resistance element built into the lightning arrester, and flows to the support arm of the tower body. It will be done. Further, the subsequent arc generated thereafter is blocked by the air discharge gap and the non-linear resistance element.

(Example) Hereinafter, an example embodying the present invention will be described in detail based on FIGS. 1 to 9.

The lightning-resistant horn insulator device of this embodiment can be seen schematically as follows: an existing tension-resistant insulator 3 that is hung on the tip of a support arm 1 of a tower body and supports an electric wire 2, and a mounting bracket 4A mounted above it. It is comprised of a lightning arrester 5 attached via a lightning arrester 5, and a weight 6 attached below the tension insulator 3 via a mounting bracket 4B.

To explain each part, a U clevis 7 as a latch is fixed to the support arm 1 with a bolt, and the clevis 7 is fixed to the support arm 1 with a bolt.
A U clevis 8, which also serves as a latch, is rotatably connected to. A tower-side horn mounting fitting 9 as a tower-side connecting fitting is connected to the U clevis 8 so as to be relatively rotatable in the vertical direction by a shaft 10, and one end of the fitting 9 is connected to a shaft 11 for relative rotation in the vertical direction. A tension insulator 3 is connected via a pole clevis 12 that can be connected.

A socket clevis 13 is provided at the end of the voltage application side of the tension insulator 3.
An electric wire side horn mounting fitting 14 as an electric wire side connecting fitting is connected via a shaft 15 so as to be relatively rotatable in the vertical direction. A parallel clevis link 17 is connected to one end of the wire-side horn mounting bracket 14 so as to be relatively rotatable in the vertical direction by a shaft 16, and to the clevis link 17, the clevis link 17 can be relatively rotatable in the vertical direction by a shaft 18. A connecting link 20 is connected to a wire clamp 19 that supports the wire 2 . Further, a jumper wire 21 is connected to the lower part of the electric wire clamp 19.

As shown in FIG. 3, the mounting bracket 4A of the lightning arrester 5 is composed of a plate member 4a and a pair of arm pieces 4c, 4c fixed to the plate member 4a and having a gap 4b. A hole 4d for bolt insertion is provided near the lower end of both arm pieces 4C94C, and similarly both arm pieces 4c, 4c
An arc-shaped elongated hole 4e is provided at the upper end. Then, after separating the existing arc horn from the tower-side horn mounting bracket 9, this mounting bracket 4A fits the arm pieces 4c, 4c into the upper part of the horn mounting bracket 9, and the pole 1- It is fixed by 22.22. The mounting bracket 4A can be installed by loosening the bolts 22 and 22 and tilting it in the track direction (arrows R and S) around the bolt 23 inserted through the hole 4d, as shown in FIG. Angle θ
is adjustable.

Further, as shown in FIG. 5, the mounting bracket 4B for the weight 6 is composed of a gap member 4f and a pair of arm pieces 4c, 4c which sandwich the gap member 4f to form a gap 4b. There is.

Then, this mounting bracket 4B is obtained by detaching the existing arc horn in the same way as the mounting bracket 4A, and then fitting the arm pieces 4c, 4c into the lower part of the tower side horn mounting bracket 9, and then attaching the bolts 23
．． 23.

As shown in Figure 1.4, the plate member 4 of the mounting bracket 4A
A lightning arrester 5 is fixed perpendicularly to the plate member 4a with bolts 24 and extends obliquely upward. On the other hand, a weight 6 is attached to the bolt 2 at the tip of the mounting bracket 4B.
It is fixed at 5.

The weight 6 has a plurality of blocks 6 as shown in FIG.
a, and arm pieces 4c, 4 of the mounting bracket 4B.
c is fixed to the tip with a bolt 25. The weight of the weight 6 can be adjusted by changing the number of blocks 6a. As shown in FIGS. 1 and 7, the lightning arrester 5 and the weight 6 are arranged vertically with respect to the axis 10 when the device is at rest, and are statically balanced and in a stable state. is set to hold.

On both sides of both arm pieces 4c, 4c of the mounting bracket 4A,
As shown in FIG. 2, a pair of arc horns 26, 26 that are inclined upward (in this embodiment, the angle of inclination is 45 degrees) are attached to the bolt 22 with the mounting bracket 4A via the mounting piece 26a.
．． It is fixed at 22. An arc horn 27 serving as a discharge electrode on the energizing side extending obliquely upward is fixed to the wire side horn mounting bracket 14 with a bolt 28.28, and is opposed to the arc horn 26.26 with a predetermined air discharge gap G1. are doing. Further, an arc horn 29 serving as a discharge electrode is fixed to the tip of the lightning arrester 5. As shown in FIG. 6, the arc horn 29 has a bearing portion 30a at the tip of a support tube 30 attached to the tip of the lightning arrester 5.
It is clamped and fixed by bolts 32 to a pair of clamping pieces 31 and 31 which are attached to be rotatable in the vertical direction (arrows J and K) about a shaft (not shown). Said A-Kho N29
can slide against the clamping pieces 31, 31 by loosening the bolt 32, and its protruding length can be adjusted. At that time, the arc horn 29 is opposed to the arc horn 27 with a predetermined air discharge gap G2 by adjusting its vertical angle and protrusion length. The arc horn 27 is also used as a discharge electrode on the protection side for the arc horns 26 and 29. Here, in order to operate this device normally, the insulation strength of the air discharge gap G2 is configured such that a margin of at least a certain value is given to the insulation strength of the lightning arrester 5.

1. In the embodiment of τ, a lightning arrester 5 with a weight of 34.0 kif and a weight 6 with a weight of 60°Okg (7) are used. Here, as shown in FIGS. 7 and 8, the shaft 10, which is the center of rotation of the tower-side horn mounting brackets 9, 9 and the double number brackets 4A, 4B, the center of gravity P1 of the lightning arrester 5, and the weight. Each virtual line corresponding to the distance from the center of gravity P2 of 6 is Ll.
, L2. 7. Then, assuming the imaginary line L1 to be the length of the arm, as shown in FIG. The moment of force due to the component force w1 of W1 acts on the imaginary line I, 2 at a angle of 1.7 perpendicular to the imaginary line 1.2, with the length of the arm being 1.7, and in a direction perpendicular to the track. The force due to component force W2 of gravity W2 of weight 6 acting on...
- Make sure that the ment is larger.

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

Now, the tension insulator 3 hung on the support arm 1 is 1, and the electric wire 2 is
Its central axis makes a catenary angle with respect to the horizontal plane. For this reason, as shown in FIG. 9, in order to cast two or more of these devices in the vertical direction of the tower body 33, the lower layer device must be The mounting angle of the mounting bracket 4A with respect to the horn mounting bracket 9 is adjusted so that the lightning arrester 5 and the jumper wire 21 are arranged with a predetermined clearance C.

At this time, the tension insulator 3 supporting the electric wire 2 is subjected to a large tension 'F (approximately 1
t~4t) is acting. Therefore, in the stationary state of this device, the tension T
acts. In addition, to give a few examples of the weight 6, the tower side horn mounting bracket 9 has its upper and lower ends vertically upright as shown in Fig. 4.7, and the lightning arrester 5 is attached to the mounting bracket 4A. It is stably held in an inclined state by the horn mounting bracket 9 at a predetermined angle α with respect to the horizontal plane.

By the way, when the electric wire 2 swings in the direction perpendicular to the line due to wind pressure, etc., the tension insulator 3 swings in the same direction around the fulcrum Z, which is the connection point of the U clevis 7°8, and the lightning arrester 5 and The weight 6 follows the tension insulator 3 and is swung in the same direction. At this time, the lightning arrester 5 and the weight 6, for example,
As shown in the figure, it rotates around the axis of action of the tension T passing through the fulcrum Z.

However, the moment of the force of the component force W2 acting on the imaginary line I, 52 as the length of the arm is larger than the moment of the force of the component force W1 acting on the imaginary line I, 52 as the length of the arm. Therefore, the horn mounting bracket 9 always tries to rotate in the Y direction and return to a stationary state due to the difference in moment between the two blades. Therefore, the lightning arrester 5 and the weight 6 are each held vertically in series, and the tower side horn handle fitting 9, U clevis 8, pole clevis 12, tension insulator 3, etc. There is no stress concentration, and the tension insulator 3 swings as if the lightning arrester 5 and the weight 6 were not attached, so the mechanical strength of the device is maintained.

Further, since the tension insulator 3 and the lightning arrester 5 are oscillated in synchronization, the air discharge gaps Gl and G2 are maintained at approximately - constant.
The discharge characteristics are stabilized and the protection performance of the device is improved.

By the way, when an abnormally high voltage caused by a lightning strike is applied to the electric wire 2, the current is discharged in the air discharge gap G2 properly maintained between the arc horn 27 and the arc horn 29, and the lightning arrester It flows to the support arm 1 of the tower body via a non-linear resistance element built in 5. Furthermore, the subsequent arc generated thereafter is blocked by the air discharge gap G2 and the nonlinear resistance element. On the other hand, if the insulation strength is reduced due to abnormal contamination or the like and an arc occurs along the creeping surface of the tension insulator 3, the arc is extinguished in the air discharge gap G1 between the arc horns 26 and 27, and the tension insulator 3 This prevents burnout and propagation of arc to the tower body.

The device of this embodiment has a lightning arrester 5 and a weight 6, in contrast to the existing tension insulator 3 attached to the support arm 1 of the tower body.
The installation fittings 4A and 4B are attached as adapters to construct the device, but the re-attachment fittings 4A and 4B are attached in advance to the newly installed tension insulator 3, and the lightning arrester 5 and The device can also be constructed by attaching a weight 6.

Therefore, this device has a wide range of applications and is very practical.

Moreover, this invention can also be implemented as follows.

(1) As shown in FIG. 10, both sides of the tower-side horn mounting bracket 9 are lengthened to provide a plurality of holes 9a.

In this other example, mounting brackets 4A for the lightning arrester 5 and the weight 6,
When installing 4B separately, the mounting position can be adjusted, so the tension insulator 3 and the lightning arrester 5, or the tension insulator 3
The clearance between the weight 6 and the weight 6 can be adjusted.

(2) As shown in Figure 11, the lightning arrester 5 and the weight 6
The mounting bracket is formed into an integrated mounting bracket 4.

In this alternative example, the mounting fitting 4 can be attached to the tower-side horn mounting fitting 9 at once, making the work easier.

Effects of the Invention As detailed above, this invention can be easily applied to existing hanging insulators, which simplifies the construction work, and prevents the electric wire from swinging abnormally due to vibration. No unreasonable stress concentration occurs on the lower insulator or its mounting hardware,
This has the excellent effect of improving the durability of the device, maintaining a stable installation state, and maintaining a constant air discharge gap to improve reliability.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment embodying this invention;
Figure 2 is an enlarged sectional view taken along line X-X in Figure 1, Figure 3 is a perspective view of the mounting bracket of the lightning arrester, Figure 4 is a partially enlarged front view of the vicinity of the lightning arrester's mounting bracket, and Figure 5 is Fig. 6 is a partially enlarged front view of the tip of the lightning arrester, Fig. 7 is a front explanatory view showing the balanced state of the lightning arrester and the weight, and Fig. 8 is a perspective view of the lightning arrester and the weight. FIG. 9 is an explanatory side view showing the action of gravity when the weight is tilted. FIG. 9 is an explanatory view showing the installed state of the tower body. FIG. 10 is a front view showing another example of the horn mounting bracket on the tower body side. A front view showing another example of the mounting bracket for the lightning arrester and the weight, and FIG. 12 is a front view showing a conventional example. 1... Support arm, 2... Electric wire, 3... Tension insulator, 4A (4B)... Lightning arrester (weight) mounting bracket, 5...
... Lightning arrester, 6... Weight, 7, 8... U clevis, 9 (14)... Tower body side (wire side) horn mounting bracket,
19... Wire clamp, 26.27.29... Arc horn, C... Clearance, Gl, G2... Air discharge gap, PI, P2... Center of gravity, Z... Fulcrum.

Claims (1)

[Claims] 1. A latch fitting is connected to the support arm (1) of the tower body, and a tension insulator (3
), and the electric wire (2) is installed on the tension insulator (3) via the wire-side connecting fitting, and the tension-resistant insulator ( The lightning arrester (5) is fixed in a cantilever manner so as to be located above 3), and the lightning arrester (5) is also attached to the tower body side connecting bracket via the mounting bracket (4B) to balance the weight of the lightning arrester (5). A weight (6) for holding the insulator (5) in a stable state is suspended, a discharge electrode on the energized side is supported upward from the connecting fitting on the wire side, and the tip of the lightning arrester (5) is A lightning-protecting horn insulator device, characterized in that a discharge electrode attached to the section and the discharge electrode on the energizing side face each other with a predetermined aerial discharge gap (G2). 2. The moment of force of the weight (6) centering on the tower side connecting fitting is larger than the moment of force of the lightning arrester (5) centering on the tower side connecting fitting.
The lightning-resistant horn insulator device described in . 3 Mounting brackets (4A,
4B) is the lightning-proof horn insulator device according to claim 1, wherein each of them is provided separately or integrally. 4. The lightning horn insulator device according to claim 1, wherein the weight of the weight (6) is adjustable. 5. The lightning horn insulator device according to claim 1, wherein the connecting fitting on the tower body side is provided with a plurality of holes for adjusting the mounting position of the mounting fittings (4A, 4B). 6. The lightning horn insulator device according to claim 1, wherein the mounting angle of the mounting bracket (4A) of the lightning arrester (5) is adjustable with respect to the tower body side connecting bracket. 7 The discharge electrode attached to the tip of the lightning arrester (5) has an adjustable length of protrusion from the tip of the lightning arrester (5), and a discharge electrode attached to the tip of the lightning arrester (5) in a direction perpendicular to the tip of the lightning arrester (5). The lightning horn insulator device according to claim 1, which is rotatable.