JPH0250566B2 - - Google Patents

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 overhead power transmission lines, particularly for tension towers, for preventing power transmission lines from melting down.

(Prior Art) Conventionally, there has been a device disclosed in Japanese Utility Model Publication No. 47-368, for example, as a device for installing a lightning arrester insulator with a predetermined air discharge gap to a power transmission line.

As shown in FIG. 9, in this device, a tension-resistant insulator 47 supporting an electric wire 46 is fixed to the tower body T, and a valve resistance element ( A lightning arrester 49 encapsulating a non-linear resistance element (non-linear resistance element) is integrally formed, and an electrode 50 provided at the tip of the same tension-resistant insulator 47 and an electrode 51 provided at the tip of the lightning arrester 49 are connected in the air. They were configured to face each other with a discharge gap G'.

(Problems to be Solved by the Invention) However, the conventional device has a tension-resistant insulator 4
Since the base end of the lightning arrester 7 and the base end of the support fitting 48 were integrally formed, it was difficult to attach the lightning arrester 49 using the existing tension-resistant insulator 47 and construct the device. . In addition, stress concentration occurs in the tension-resistant insulator 47 and the support fittings 48 due to the bending moment due to the dead weight of the lightning arrester 49, or when the electric wire 46 vibrates due to the wind.
There is a risk that the mechanical strength of the device may decrease due to irregular rocking of the device and bending load or torsional force acting on the tension-resistant insulator 47, support metal fittings 48, and lightning arrester insulator 49. It was hot. Furthermore, lightning insulator 49
was supported above the tension-resistant insulator 47, so rainwater and snow from the lightning arrester 49 not only migrate to the tension-resistant insulator 47, but also reduce the stain resistance.
When viewed from the ground, the lightning arrester 49 is a tension-resistant insulator 47
It was difficult to observe because it was located above the roof, and inspection work was not easy.

In view of the above circumstances, the present invention aims to provide a lightning-resistant horn insulator device that can be applied to existing tension-resistant insulator devices.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention connects the tension insulator 17 to the support arm 1 of the tower body via the tower body side connecting fitting, and also Tension insulator 17
The electric wire 26 is installed through the electric wire side connecting fitting,
An adapter 10 is attached to the tip of the support arm 1, facing forward and rising upwards, and a lightning arrester 3 is attached to the tip of the adapter 10.
4 is suspended and fixed, and the upper end of the lightning arrester 34 is positioned above the tip of the support arm 1,
The electric wire side connecting fitting supports the discharge electrode 29 on the power supply side, and connects the discharge electrode 36 attached to the lower end of the lightning arrester 34 and the discharge electrode 29 on the power supply side with a predetermined air discharge gap. The configuration is such that they face each other with G.

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

When the electric wire swings due to wind pressure or the like, the tension insulator 17 swings around the tower side connecting fitting. At this time, the tension insulator 17 swings independently of the lightning arrester 34, and unreasonable stress concentration does not occur in the tower side coupling fittings, the adapter 10, the lightning arrester 34, and the tension insulator 17.

In addition, snow and rainwater on the support arm 1 can be removed from the adapter 10.
It does not move to the lightning arrester 34 through the lightning arrester 34.

Furthermore, application to an existing tension insulator device is also easily achieved by attaching the lightning arrester via the adapter 10.

Furthermore, since the adapter 10 or the lightning arrester 34 is fixed in a hanging manner, no bending load is applied to the lightning arrester 34.

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

As shown in FIG. 4, the support arm 1 of the tower body is
A pair of left and right horizontal support frames 2 and 3, a connecting plate 5 interposed between the tips of the horizontal support frames 2 and 3 and fixed by bolts 4 and nuts 4a, and a bolt 6 connected to the connecting plate 5. , and an inclined frame 7 connected by nuts 6a, and a tension-resistant insulator mounting bracket 9 fixed to the bottom surfaces of the ends of the horizontal support frames 2 and 3 by bolts 8 and nuts 8a. The bolts 8 are short enough to connect the support frames 2, 3 and the mounting fittings 9 in the existing tower body, but in this embodiment, the existing short bolts are used in the installed state. Replace them one by one with longer bolts 8, then replace the same bolts 8 to 8.
An adapter 10 for attaching a lightning arrester 34, which will be described later, is attached using the upper end of the nut 8b. In the attached state shown in FIG. 1, the adapter 10 faces the front of the support arm 1 and stands up upward, and has a protruding portion 10a formed at its base end so as to straddle the connecting plate 5.

Next, a pair of tension insulator devices connected to both left and right ends of the mounting bracket 9 will be explained based on FIGS. 2 and 3.

A U clevis 11 is fixed to the mounting fitting 9 with bolts, and a U clevis 12 is rotatably connected to the clevis 11. Said U clevis 12
A tower-side horn mounting fitting 13 equipped with an arc horn 13A is connected by a shaft 14 so as to be relatively rotatable in the vertical direction, and one end of the fitting 13 is connected by a shaft 15 so as to be relatively rotatable in the vertical direction. A tension insulator 17 is connected via a ball clevis 16. In this embodiment, the above-mentioned U clevis 11,
12, the tower side horn mounting fitting 13, and the ball clevis 16 constitute a tower side connecting fitting.

A wire-side horn mounting bracket 19 equipped with an arc horn 19A is connected to the power supply side end of the tension insulator 17 via a socket clevis 18 so as to be relatively rotatable in the vertical direction by a shaft 20. A parallel clevis link 22 is connected to one end of the horn mounting bracket 19 so as to be relatively rotatable in the vertical direction by a shaft 21, and a connecting link 24 is connected to the clevis link 22 so as to be relatively rotatable in the vertical direction by a shaft 23. An electric wire 26 is supported by the link 24 via an electric wire clamp 25. Also, the wire clamp 25 and the wire crank 2 of the left tension insulator 17
A jumper wire 27 is connected between the terminal 5 and the terminal 5. In this embodiment, the socket clevis 1 described above is used.
8, wire side horn mounting bracket 19, parallel clevis link 22, connection link 24, and wire clamp 2
5 constitutes an electric wire side connecting fitting.

The wire-side horn mounting bracket 19 has first to third
As shown in the figure, the base end side of an arc horn 29 serving as a discharge electrode on the power supply side is fixed with a bolt 30 in a direction perpendicular to the line via a mounting bracket 28, and its distal end side extends obliquely upward. Further, on the opposite side of the horn mounting bracket 19 from the arc horn 29,
A rod 32 is fixed via a mounting bracket 31, and a weight 33 is attached to the tip of the rod 32 to balance the weight of the arc horn 29 and hold the arc horn 29 in a stable state.

On the other hand, on the lower surface of the tip of the adapter 10, a first
As shown in the figure, a lightning arrester 34 containing a built-in resistance element with non-linear voltage-current characteristics is suspended and fixed downward. The lower end of the lightning arrester 34 has a fifth
As shown in the figure, an arc horn 36 as a discharge electrode is attached via a support member 35.
The support member 35 supports the arc horn 36 with the bolt 3.
7, it is composed of a pair of clamping pieces 35a, 35a for clamping and fixing so that the position in the axial direction can be adjusted. The supporting member 35 is connected to the tip electrode 38 of the lightning arrester 34 via its base end cylindrical portion 35b.
Support tube 3 having a flange portion 39a attached to
9 is removably screwed and fixed with a bolt 40. The base end of the flange portion 39a of the support tube 39 is fitted into the recess 38a of the electrode 38, and the other end of the flange portion 39a is connected to a holding member 41 having a hole 41a through which the tip of the support tube 39 is inserted. The support tube 39 is fitted into the recess 41b, and the support tube 39 is fixed by pressing the holding member 41 with the bolt 42. This support tube 39 is attached to a bolt 42.
By loosening the arc horn 36, the angle of inclination of the arc horn 36 in the horizontal direction can be adjusted.

As shown in FIGS. 6 and 7, the arc horn 36 is provided with a rotation support cylinder 43 for bending at its intermediate portion. The rotary support cylinder 43 includes a pair of upper and lower discs 43a, 43a, a support shaft 44b connecting their centers, and a rotary cylinder 44c fitted on the support shaft 44b so as to be relatively rotatable. It is configured. The rotary cylinder 44c is provided with a long hole 44d formed in a semicircular arc shape, and the bolt 45 can slide within the long hole 44d. Further, a base end 36a of an arc horn 36 is connected to a support portion 44e that is integrally provided on one side of both the disks 44a, 44a, and an arc horn is connected to one side of the rotating tube 44c. The distal end side 36b of 36 is connected. Then, by loosening the bolt 45 and rotating the tip side 36b of the arc horn 36 in the direction of the arrow in FIG. 6, the horizontal bending angle of the intermediate portion of the arc horn 36 can be adjusted. There is. Arc horn 36 configured in this way
is opposed to the arc horn 29 supported by the tension insulator 17 with a predetermined air discharge gap G therebetween. Note that the rotation support tube 43 may be arranged so that its bending angle in the vertical direction can be adjusted.

Here, in order to operate this device normally, the insulation strength of the air discharge gap G is configured to have a margin of at least a certain value with respect to the insulation strength of the lightning arrester 34.

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

Now, when an abnormally high voltage due to a lightning strike is applied to the electric wire 26, the current at this time is
The discharge occurs in the air discharge gap G that is properly maintained between the arc horn 36 and the lightning arrester 34, and is transmitted through the nonlinear resistance element built into the lightning arrester 34 to the support arm 1 of the tower body.
flows to Furthermore, the subsequent arc generated thereafter is blocked by the air discharge gap G and the nonlinear resistance element. On the other hand, if the insulation strength is reduced due to abnormal contamination or other causes and an arc occurs along the creeping surface of the tension insulator 17, the arc will be generated in the air discharge gap between the arc horns 19A and 13A, and the tension insulator 17 is prevented from burning out, and arc propagation to the tower body is also prevented.

The device of this embodiment allows the support arm 1 to be attached to the support arm 1 without having to replace or move the existing tension insulator 17 attached to the support arm 1 of the tower body.
On the other hand, the lightning protection horn insulator device can be constructed by simply attaching the lightning arrester 34 via the adapter 10, and therefore the scope of application is expanded and it is very practical.

In addition, when the electric wire 26 is mounted on a pole, shaking due to wind pressure or the like acts on the electric wire 26, causing the tension insulator 17 to become attached to the U clevis 12.
Even if the lightning arrester 34 is rotated around , it has no effect on the lightning arrester 34, and therefore, there is no unreasonable stress concentration on the tension insulator 17, the tower side connecting fittings, and the lightning arrester 34.
The mechanical strength of the device is improved.

Furthermore, in this embodiment, since the base end of the lightning arrester 34 is located above the tip of the support arm 1, rainwater and snow on the support arm 1 will not move to the lightning arrester 34, and this Lightning arrester 3
The stain resistance of No. 4 is improved.

Furthermore, compared to a lightning horn insulator device in which the lightning arrester 34 is located between the tower body and the electric wire 26, it is easier to ensure a safe distance between the tower body and the lightning arrester 34.

Further, a tension insulator 17 sealed to the support arm 1
is slightly deviated downward by its gravity, and the central axis of the tension insulator 17 forms a different catenary angle with respect to the horizontal plane for each tower body. For this reason, the opposed state of the arc horns 29 and 36 attached to the tension insulator 17 and the lightning arrester 34 varies somewhat depending on the tower body. Therefore, the angle of the arc horn 36 can be adjusted by rotating it in a direction perpendicular to the lightning arrester 34, or the length in the track direction can be adjusted by sliding it within the support member 35, or the length of the arc horn 36 in the direction of the track can be adjusted by rotating it in the direction perpendicular to the lightning arrester 34. By adjusting the bending angle, the arc horn 2
The opposing state of 9 and 36 is easily corrected, and a predetermined aerial discharge gap G is set. From this point of view as well, the scope of application to the tower body becomes wider.

The grounding conditions of the tension insulator 17 and the lightning arrester 34 are as follows:
Each can be observed from the ground, making it easy to inspect the equipment.

Moreover, this invention can also be implemented as follows.

(1) As shown in FIG. 8, attach the adapter 10 to the bottom surface of the mounting bracket 9. In this case, there is no need to form the bulge 10a in accordance with the shape of the connecting plate 5.

(2) In the above embodiment, as shown in FIG. 2, the application was applied to the tension insulator 17 on the right side, but
This also applies to 7. In this case, it becomes possible to quickly respond to abnormally high voltage caused by a lightning strike approaching from the left side.

Effects of the Invention As detailed above, the present invention can be easily applied to existing tension insulator devices, so construction work can be simplified and the tension insulator can withstand shaking due to wind pressure, etc. This prevents undue stress concentration on the tension insulators, tower body side coupling fittings, and lightning arrester insulators, improves the durability of the equipment, maintains a stable installation condition, and prevents rainwater and snow caps on the support arm side from moving to the lightning arrester. By eliminating this, the stain resistance of the lightning arrester can be improved, inspection work from the ground can be facilitated, and reliability can be improved.

Further, in the present invention, since the lightning arrester is suspended and fixed to the lower surface of the tip of the adapter, it is possible to eliminate bending load from acting on the lightning arrester.Furthermore, since the lightning arrester is located outside of the electric wire, the tower Compared to a device in which a lightning arrester is installed between the body and the electric wire, it is easier to secure a safe distance during work, and since the lightning arrester is not located directly under the upper phase electric wire, the upper phase electric wire This prevents falling snow and rainwater from hitting the lightning arrester, preventing it from becoming contaminated.
Moreover, it has the effect of stabilizing the discharge gap.

[Brief explanation of drawings]

Fig. 1 is a side view showing an embodiment embodying the present invention, Fig. 2 is a plan view showing the entire device, Fig. 3 is a sectional view taken along line A-A in Fig. 2, and Fig. 4 is a support arm. Fig. 5 is an enlarged sectional view of the lower end of the lightning arrester, Fig. 6 is a plan view of the rotary support tube installed in the middle of the arc horn, and Fig. 7 is also a plan view of the rotary support tube installed in the middle of the arc horn. 8 is a perspective view showing another example of the adapter, and FIG. 9 is a front view showing a conventional example. 1...Support arm, 9...Mounting bracket, 10...
Adapter, 17... Tension insulator, 26... Electric wire, 2
8... Mounting bracket, 29... Arc horn as a discharge electrode on the charging side, 34... Lightning arrester, 35...
Support member, 36... Arc horn as discharge electrode of lightning arrester, 39... Support tube, 43... Rotating support tube, G... Discharge gap.

Claims (1)

[Scope of Claims] 1. A tension insulator 17 is connected to the support arm 1 of the tower body via a tower body side coupling fitting, and an electric wire 26 is connected to the tension insulator 17 via an electric wire side coupling fitting.
An adapter 10 is attached to the tip of the support arm 1, facing forward and rising upward of the support arm 1, and a lightning arrester 34 is fixedly suspended from the tip of the adapter 10. The upper end of the insulator 34 is located above the tip of the support arm 1, the electric wire side connecting fitting supports the discharge electrode 29 on the energized side, and the discharge electrode 29 attached to the lower end of the lightning arrester 34 The electrode 26 and the discharge electrode 2 on the power supply side
9 are opposed to each other with a predetermined air discharge gap G. 2. The adapter 10 is fixed to the tip of the support arm 1 using a bolt 8 that fixes the mounting bracket 9 to the support arm 1.
The lightning-resistant horn insulator device described in . 3. The lightning horn insulator device according to claim 1, wherein the discharge electrode 36 is attached to the lightning arrester 34 so that its position in the line direction can be adjusted. 4. The lightning horn insulator device according to claim 1, wherein the discharge electrode 36 is attached to the lightning arrester 34 so that its rotation angle in a horizontal direction can be adjusted. 5. The lightning horn insulator device according to claim 1, wherein the discharge electrode 36 is provided with a bendable rotary support tube 43 at an intermediate portion thereof. 6. According to claim 1, the discharge electrode 36 faces the discharge electrodes 29, 29 on the energized side of the left and right tension insulators 17, 17 connected to the tip of the support arm 1. Lightning resistant horn insulator device. 7. The lightning horn insulator device according to claim 1, wherein the discharge electrode 29 on the energizing side is balancedly supported by a weight 33 via a connecting fitting on the wire side.