JPS61240514A - Arresting insulator unit for aerial power transmission line - 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] Object of the Invention (Field of Industrial Application) The present invention relates to a lightning arrester insulator for overhead power transmission lines, and more specifically, it is provided with suspension insulators for suspending power transmission lines on both left and right sides, This invention relates to a lightning arrester device for an overhead power transmission line in which a lightning arrester is installed between the insulators.

(Conventional technology) Generally, overhead power transmission lines are installed on steel towers to quickly discharge abnormally high voltage caused by lightning strikes to the ground using lightning protection insulators to prevent ground faults and improve system reliability. A lightning arrester device is used.

As this conventional example, as shown in FIG.
The electric wire 30 is connected to the lower end of the insulator chain 86 via a clamp 87.
Further, a lightning arrester 90 is cantilever-supported obliquely on the upper gear knob metal fitting 88 via a support metal fitting 89, and an arcing horn 91 is fixed to the lower end of the lightning arrester 90.
There was one in which an arcing horn 93 fixed to a cap metal fitting 92 at the lower end of the insulator chain 86 faced each other.

On the other hand, conventionally, as shown in FIG. 7, an insulator chain 86 is suspended from the tip of the steel tower 1, and a lightning arrester 94 is installed between the tower 1 and the electric wire 30 supported at the lower end of the insulator chain 86. There was a type that was installed diagonally and used air gap heat, that is, a type that was used as lightning arresters at power generation and substations.

(Problem to be Solved by the Invention) However, in the former conventional device shown in FIG. 6, the lightning arrester is installed offset with respect to the hanging insulator, so it is not symmetrical with respect to the central axis of the insulator. Therefore, it was difficult to maintain a stable shape during erection, and installation work was time-consuming.

In a lightning arrester device with such a configuration, if the lightning arrester element has a low discharge withstand capacity, a low level of pollution resistance, and the lightning arrester is relatively smaller and lighter than the suspended insulator, it may be installed directly to the suspended insulator. The influence of the single lightning arrester on the behavior of the entire insulator device was negligible. However, as the scope of application has expanded and lightning arrester insulators have become larger due to demands for increased discharge withstand capacity, implementation of safety measures, and improved antifouling properties, the drawbacks of this pole mounting method have become impossible to ignore.

In other words, there is insufficient clearance due to static balance when there is no wind, or abnormal vibrations due to lateral vibrations in the direction of the track or perpendicular direction under strong winds, and inertia caused by the self-weight valve of the lightning arrester and vibrations on the end fittings of the suspension insulator. These include insufficient strength due to bending loads, and expansion of the width under the line due to installing the lightning arrester in a nearly horizontal position in order to ensure the insulating strength and air gap length of the lightning arrester.

In the conventional device shown in Figure 7, when there is no wind or vibration, the load shared by the lightning arrester is only its own weight, but when the wire is vibrating due to strong winds, falling ice or snow, etc., the horizontal load generated on the wire is absorbed by the lightning insulator. Since the insulator now carries most of the burden, the lightning arrester is required to have the same strength and reliability as a hanging insulator, resulting in a problem of increased size and weight.

The tower arms also needed to have a special structure to withstand this load. Furthermore, since the wire is supported at two points, the suspension insulator and the lightning arrester, and the vertical load is shared and the horizontal load is borne, special lamps are required, resulting in a complex structure that reduces reliability and price. There was a problem with the surface.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention connects a connecting yoke to the steel tower via a hanging metal fitting in a rotatable and flammable manner, and The upper ends of a pair of left and right suspended insulators are rotatably connected to both ends, and a spacing member is installed between the lower ends of both suspended insulators, so that both suspended insulators are arranged in an almost inverted V shape.
A power transmission line is supported at two points at the lower ends of both suspended insulators, and at least one of the upper and lower parts of the lightning arrester is attached to the center of the connecting yoke or the spacing member. The lightning arrester is made immovable in the left-right direction, and the connecting yoke, suspension insulator, spacing member, and lightning arrester are arranged symmetrically with respect to a perpendicular line passing through the center of rotation of the connecting cork. I'm picking it up.

(Function) In the present invention, the entire lightning arrester device is symmetrical with respect to a perpendicular line passing through the center of rotation of the connecting yoke, and the power transmission line is held at two points, so the entire device is stabilized and wind pressure is applied to the power transmission line. Even if an external force is applied, the unbalance of the suspended insulator load is suppressed, and collisions of the suspended insulators are also less likely to occur. When either one of the two suspension insulators breaks off, the separated suspension insulator collides with the lightning arrester located at the center. At this time, the rotational force of the detached hanging insulator is almost solely due to its own weight, and therefore, the shock caused by the 1-hour collision is small and damage to the lightning arrester insulator is prevented.

As a result, a broken suspension insulator will not collide with a normal suspension insulator, and as a result, a normal suspension insulator will be prevented from breaking off, and the transmission line will not fall to the ground, resulting in high reliability even in abnormal situations. It is possible to ensure sex.

(Example) Hereinafter, a first example embodying the present invention will be described based on FIGS. 1 to 4.

As shown in Fig. 2, a hanging bracket 2 with a U-shape on the front is fixed to the steel tower 1 with bolts 3, and another hanging bracket 2 with a U-shape on the side is fixed to the tower 1. A lower bracket 4 is hung so as to be rotatable in the left-right (track) direction and front-rear (perpendicular to the track direction) direction, and a connecting yoke 6 is connected between the lower ends of the hanging bracket 4 by a connecting pin 5 in the left-right direction. It is hung so that it can rotate.

Roughly speaking, the lightning arrester device for an overhead power transmission line according to this embodiment includes a pair of suspended insulator chains 7, 7 as suspension insulators supported at both left and right ends of the connecting cork 6 and formed in the same structure.
, the spacing rod 22 installed between the lower ends of the suspension insulator chains 7, 7, the lightning arrester 33 suspended and fixed to the center of the connection yoke 6, and the spacing rod 22 at both ends thereof. It is comprised of a pair of left and right clamps 28 and 28 for supporting the power transmission line 30 at two points.

Therefore, next, to explain the above-mentioned double-sided insulator chains 7, 7, a first connection link 9 is connected to both left and right ends of the connection yoke 6 by a connection pin 8 so as to be rotatable in the left-right direction,
The link 9 has a second connecting link with a connecting pin 10]1
are connected to be rotatable in the front and rear directions. In addition, a third connecting link 1 is connected to the second connecting link 11 by a connecting pin 12.
3 are connected to be rotatable in the left and right direction. Furthermore, the upper end of an insulator chain 15 constructed by connecting a large number of insulators in series is connected to the lower end of the third connecting link 13 via a connecting pin 14 so as to be rotatable in the left-right direction. A fourth connecting link 16 is connected to the lower end of the insulator chain 15 so as to be rotatable in the left-right direction, and a connecting plate 18 is connected to the link 16 so as to be rotatable in the left-right direction by a connecting pin 17. Arcing horns 19 and 20 on the energizing side and the grounding side are connected to the plate 18 and the third connecting link 13 by bolts 21.
Cantilevered by.

A spacing rod 22 is installed by a connecting pin 23 between a pair of connecting plates 18.18 located at the lower ends of both suspension insulator chains 7.7, and a spacer rod 22 is installed at the center of the spacing rod 22. The power side discharge electrode 24 is attached to the nut 25 so that its vertical position can be adjusted.

The discharge electrode 24 is formed by a pair of left and right metal fittings 24a having an inverted U-shape on the sides, which are fixed by nuts 25 so as to be vertically adjustable with respect to the spacing holding rod 22, and a metal fitting 24b installed between the two full fittings 24a. It is configured. As described above, in this embodiment, in order to keep the gap length G1 constant against the relative movement between the discharge electrode 24 and the discharge electrode 52 on the ground side of the lightning arrester, the discharge electrode 24 has a certain length also in the line direction. It is preferable to configure it so that it also has a width in the perpendicular direction.

The connecting pin 23 and the connecting plate 18 are connected by a discharge electrode 24.
In order to ensure accurate positioning, it is preferable to do this without any play.

As is clear from FIG. 2, the two suspended insulator chains 7, 7 are installed in a substantially inverted V-shape as a whole.

Further, the connecting yoke 6, both suspended insulators 7.7, and the spacing rod 22 are symmetrically formed with respect to the perpendicular line H--H passing through the connecting pin 5, and are formed generally into a trapezoidal shape as a whole.

A fifth connecting link 26 is connected to the pair of connecting plates 18.18 so as to be rotatable in the left and right direction by a connecting pin 27, and both links 26.26 are each provided with a clamp 28.2.
8 are rotatably connected by connecting pins 29.29, and the power transmission line 3o is held at three positions by both clamps 28.28. The power transmission line 30 is covered with an armor rod 31, and the clamp 28 and the power transmission line 3o are fastened with a nut 32 so that they cannot move relative to each other.

Next, the lightning arrester 33 attached to the connection yoke 6 will be explained.

Fixed mounting plates 3 are installed on the left and right sides of the connection yoke 6, respectively.
4.34 are hung down and fixed by bolts 35, and a hanging lug 41 provided on the lightning arrester 33 is fastened and fixed by bolts 36 between the lower ends of the re-fixing mounting plates 34.34. This lightning arrester 33 is located on the perpendicular line H-, H passing through the connecting pin 5.

Next, the structure of the lightning arrester 33 will be explained with reference to FIGS. 3 and 4.

Cylindrical flange fittings 38 and 39 are fitted and fixed to the upper and lower outer circumferential surfaces of the porcelain insulator tube 37 by cementing 40. Hanging ears 41, 41 are integrally formed on the outer circumferential surface of the upper flange fitting 38 at 180 degrees from each other and are attached to the fixed mounting plate 34, 34 by bolts 36.

On the end faces of the insulator pipe 37 and the flange fittings 38 and 39,
The terminal plate 4.2.43 is fixed by a plurality of bolts 44 (eight in this example, but only one is shown). Seal members 45 and 45 are interposed between the end faces of the insulator tube 37 and the terminal plates 42 and 43, respectively.

The terminal plates 4.2, 4.3 are provided with pressure relief passages 4.2a, 43a which communicate the space inside the insulator tube 37 with the atmosphere. A rupture disc 46.46 is brought into contact with the end face of the terminal plate 42.43 so as to cover the pressure release passage 4.28.43a, and a pressure ring 47 is attached to the surface of the rupture disc 46.46.
．． 47 are abutted and fixed by the bolts 44. Seal members 48 and 49 are interposed concentrically at two locations between the end faces of the terminal plates 42 and 43 and the rupture plates 46 and 4.6, respectively, so that the space within the insulator tube 37 is maintained in a sealed state. There is.

The terminal plate 42. ．． The pressing ring 4 is attached to the end face of 1.3.
The opening edges of the pressure relief path forming covers 50 and 50 are brought into contact with each other so as to surround the vicinity of the outer periphery of the pressure relief path forming covers 50 and 7.47, respectively.
．． 50 is fixed to the terminal plates 42 and 43 with a plurality of bolts 51. On the outside of the cover 50.50, pressure relief ports 50a and 5 are provided so as to be inclined toward each other and correspond to each other.
0a is formed.

At the center of the lower surface of the lower pressure relief path forming cover 50, a grounding side discharge electrode 52 that faces the energizing side discharge electrode 24 with a certain gap is provided to protrude downward, and both discharge electrodes 24
．． 52 discharge gap G1, the arcing horn 19
, 20, Glxl, 3<G2 is set so that discharge always occurs on the discharge gap Gl side.

In order to keep the discharge gap G1 constant against the above-mentioned relative displacement, the discharge electrode 52 is preferably formed on a circular arc centered on the connecting point of the hanging fittings 2 and 4 in the direction perpendicular to the line, and has a certain width.

On the other hand, a third,
As shown in Figure 4, arcing ring arms 53a, 53a
is attached, and a substantially annular arcing ring 53.53 is attached to the end thereof so as to surround the insulator tube 37 with a margin.
is horizontally supported in a cantilevered manner, and a portion thereof is cut out at a position corresponding to the pressure relief ports 50a and '50a, as shown in FIG. If the gap between the lower arcing ring 53 and the lower end of the camp fitting 15a located at the upper end of the insulator chain 15 is 03, Glxl is set as 3<G3, and discharge is always performed in the discharge gap G1. That's what I do.

Next, to explain the internal lightning protection structure of the insulator tube 37, the inside of the insulator tube 37 is made of reinforced plastic (F
A tension-resistant insulating cylinder 54 made of material such as RP) is accommodated,
Inner flange fittings 55 are attached to the outer periphery of both upper and lower ends of the insulating cylinder 54. '55 are hermetically fitted and fixed with an adhesive 56.

The end faces of both flange fittings 55.55 and the terminal plate 42.4
Mounting tubes 57 and 58 are interposed between the two and 3, and are fixed with a plurality of bolts 59 and 60. Then, the upper mounting cylinder 57 is tightened and fixed to the terminal plate 42 by the bolt 59, and the tension-resistant insulating cylinder 54 is suspended and held in a predetermined position.

On the other hand, pressure relief passages 55a, 55a are transparently provided in the lid of the flange fitting 55.55, and the flange fitting 55.55 and the mounting tube 57 are arranged so as to seal the passages 55a, 55a.
．． 58, rupture discs 61, 61 are interposed. Seal members 62.degree. 62 are interposed between the flange fittings 55.degree. Further, a sealing member 63 is also interposed between the terminal plate 42 and the mounting tube 57.

An engagement recess 58a is formed in the lower end surface of the lower mounting tube 58, and an engagement protrusion 4 protruding from the upper surface of the terminal plate 43 is formed in the engagement recess 58a.
3b is inserted so as to be relatively movable in the vertical direction, and absorbs the relative movement in the vertical direction due to the difference in thermal expansion between the insulator tube 37 and the tension-resistant insulating tube 54, thereby preventing damage to the tension-resistant insulating tube 54. . Further, a seal member 64 is interposed between the engagement recess 58a and the engagement protrusion 43b. Furthermore, a drop-off prevention bolt 65 is attached to the terminal plate 43 and attached to the mounting tube 58.
The insulator tube 37 is screwed to the flange fitting 55 through the insulator tube 37 to allow relative movement between the insulator tube 37 and the tension-resistant insulating tube 54.
This is to prevent the insulated pipe 37 from falling when the insulated pipe 37 is broken.

Further, a seven-round recess 4.3 C is formed on the upper surface of the terminal plate 43, and a spring 84 having a shunt 83 is housed in the recess 4.3 C, and the upper end of the spring 84 is pressed against the lower surface of the mounting tube 58. , electrical continuity is measured.

A lightning arrester element 67 made of a material mainly composed of zinc oxide and having non-linear voltage-current characteristics is accommodated in the tension-resistant insulating cylinder 54 . The lightning arrester element 67 has an annular tightening member 69.69 engaged with contact fittings 68.68 that are in contact with both upper and lower ends, and a tightening rod 70 formed of FRP is attached to this tightening member.
A plurality of them are stacked together with a nut 71 inserted through them.

As shown in FIG. 3, an element 67 is pressed between the recess 55b of the flange fitting 55 and the contact fitting 68 to ensure good contact between the elements and to prevent mutual displacement of the elements due to external impact. A spring 84 having a shunt 83 is housed therein.

Next, the operation of the lightning arrester device for overhead power transmission lines constructed as described above will be explained.

Now, when an abnormal voltage is applied to the overhead power transmission line due to an unexpected large-scale lightning strike, this voltage passes through the clamp 28, the fifth connecting link 26, the connecting plate 18, the spacing rod 22, and the discharge electrode 24 on the energized side. , is discharged to the ground-side discharge electrode 52. After passing through the lightning arrester 33, it flows to the steel tower 1 via the hanging ears 41 of the flange fitting 38, the fixed mounting plate 34, the connection yoke 6, and the hanging fittings 4 and 2, and is grounded.

In a very peculiar state, the abnormal voltage is caused by the lightning arrester 3.
In an electrically conductive state in which the current flows to the lightning arrester element 67 of No. 3 and the element 67 is destroyed, an abnormal discharge occurs and an extremely high temperature arc is generated. As a result, the pressure inside the tension-resistant insulating tube 54 increases, causing the rupture discs 61 and 46 to rupture one after another, causing the terminal plate 4 to rupture.
An ultra-high temperature arc flows into the pressure relief path forming cover 50.50 from the pressure relief passages 42a and 43a of Nos. 2 and 4.3, and is further discharged to the outside from the pressure relief ports 50a and 50a. Move to ring 53.53.

Due to the action of the insulating tube 54, no internal pressure acts on the insulator tube 37, and the extremely high temperature arc is kept away from the insulator tube due to the coupled action of the arcing ring 53 and the pressure relief port 50a.
Its damage is prevented.

Now, in the embodiment of the present invention, the suspension insulator chains 7 and 7 are attached in a substantially inverted V shape to the connection yoke 6 rotatably suspended from the steel tower 1, and A spacing rod 22 is installed and fixed between the lower ends of the rod 2.
The power transmission line 30 is held at three places at both ends of the connecting yoke 6, and the upper end of the lightning arrester 33 is fixed to the center of the connecting yoke 6, and the line passes through the rotation center of the connecting yoke 6, that is, the connecting pin 5. With respect to the perpendicular line H-H, each of the above-mentioned members is configured symmetrically, so even if the power transmission line 30 is shaken in the line direction due to wind, etc., the unbalance of the insulator interlocking load is suppressed, and the lightning protection insulator No abnormal stress will occur.

Furthermore, even when the pole swings in a direction perpendicular to the track direction, abnormal movement is prevented, and the pole mounting condition is stabilized.

Furthermore, in the event that either one of the pair of suspended insulator chains 7, 7 is separated, one of the clamps 28 is moved downward by the weight of the power transmission line 30, but the amount of movement is not so large, and moreover, Since the clamp 28 also does not deviate much from its original position, the separated suspension insulator chain 7 is rotated toward the lightning arrester 33 around the connecting bin 8 solely by its own weight.

However, this rotational force is weak, and the shock caused by the collision against the lightning arrester 33 is small, so that the lightning arrester 33 is not destroyed. As a result, the suspended insulator chain 7 was separated from the lightning arrester 33.
Although the lightning arrester may be slightly damaged by colliding with the lightning arrester,
The power transmission line 3 is reliably prevented from destroying the normal suspension insulator chain 7.
0 can be prevented from falling to the ground.

Next, a second embodiment of the present invention will be described based on FIG.

This second embodiment is different from the first embodiment in that the lower end of the lightning arrester 33 is electrically connected to the spacing rod 22 without providing a discharge gap. Accompanied by a connecting yoke 6 and a spacing rod 2
The only difference is the structure in which the lightning arrester 33 is attached to the second embodiment, and the other configurations are the same as in the first embodiment.

Therefore, to explain only the different parts, connecting links 73.73 are supported by pins 72 on both left and right sides of the connecting yoke 6 so as to be rotatable in the left and right direction, and a flange is attached to the lower end of the links 73.73. The upper end of the hanging ear 74.74 formed integrally with the metal fitting 38 and protruding upward is connected to the pin 75.7.
5, they are connected so as to be rotatable in the front and rear directions.

On the other hand, a mounting plate 76 is integrally formed above the central portion of the spacing rod 22, and a connecting link 78. 78 and connecting links 79, 79 are connected by pins 80.

Further, a lead wire 81 for noise prevention is connected between the mounting plate 76 and the pressure relief path forming cover 50, and electrically connects the rod 22 and the lightning arrester 33.

Note that a plate-shaped reinforcing rib 82 is integrally formed on the lower side of the spacing rod 22.

In this second embodiment, the center of the spacing rod 22 and the connecting yoke 6 are connected by the lightning arrester 33, so that not only the entire lightning arrester device becomes more stable, but also the suspension insulator chain 7. When one side is severed, the clamp 28
It is possible to reduce the amount of deviation of the insulator compared to the first embodiment, thereby further alleviating the shock to the normal suspension insulator chain 7, and
By further reducing the rotation of the disconnected suspension insulator chain 7, the influence on the lightning arrester 33 can be reduced as much as possible.

Other functions and effects are similar to those of the first embodiment.

Note that the present invention can also be embodied in the following embodiments.

(1) In the first embodiment, the lightning arrester 33 is mounted so as to be unrotatable in the left-right direction and rotatable in the front-rear direction.

At this time, the ground side discharge electrode 52 of the pressure relief path forming cover 50
It is desirable that the discharge gap G1 is always kept constant by forming the side surface into an arcuate shape.

(2) For example, the rupture disc 61 or the pressure relief path forming cover 50
．． Any lightning arrester may be used, such as a type of lightning arrester in which the number 50 is omitted.

(3) Instead of the suspended insulator chain 15, one or more long-stem insulators (as shown) may be used. 1(4) In the second embodiment, since there is no discharge gap between the lightning arrester 33 and the spacing rod 22, it is necessary to monitor the deterioration status of the lightning arrester element 67. For this purpose, the upper part of the lightning arrester 33 and the connection yoke 6 are insulated, and a lead wire (the path shown in the figure) is connected from the upper part of the lightning arrester 33 to a measuring device (or a deterioration display device, an operation display device, etc.). Wire to the route shown in the diagram) and ground. The measuring device may be fixed to the connecting yoke 6, and the input side terminal may be connected to the flange fitting 38, and the output side terminal may be connected to the yoke 6. In the first embodiment having a discharge gap, an operation display device is used in place of the measuring device.

Effect of the invention As detailed above, the present invention has the following effects.

(1) ii' Even if the lightning insulator becomes larger, the static balance of the entire lightning arrester device is maintained, making installation easier.

(2) It is possible to suppress the unbalance of the suspended insulator load even when the suspended insulator is shaken sideways under strong winds, there is no collision of the suspended insulator, and mechanical reliability is increased, and an economical design is possible.

(3) Since the gap length can be maintained constant even during lateral vibration under strong winds, this method can maintain lightning protection characteristics constant and improve reliability.

(4) Since the insulator device is symmetrical with respect to the hanging point,
Even under strong winds, there is no abnormal vibration, and therefore no excessive stress is generated in the lightning arrester.

(5) In addition, because only the tensile load is applied to the hanging insulator in the axial direction of the insulator due to the action of the tower body side and the energized side yoke, it is easy to ensure mechanical strength and reliability can be improved. .

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the female body of a lightning arrester device for power transmission lines in a pole-mounted state showing a first embodiment of the present invention, FIG. 2 is an enlarged front view of the lightning arrester device, and FIG. FIG. 4 is an enlarged half-sectional view taken along line BB in FIG. 2, FIG. 5 is a front view showing the second embodiment of the present invention, and FIGS. 6.7 are FIG. 3 is a front view showing a conventional example. 6...Connection yoke, 7...(Suspension insulator chain, 22...
・Space maintenance rondo, 26...5th connecting link, 33・
・・Lightning insulator, perpendicular H-H0

Claims (1)

[Claims] 1. A connecting yoke is rotatably connected to the steel tower via a hanging metal fitting, and the upper ends of a pair of left and right suspension insulators are rotatably connected to both ends of the connecting yoke. A spacing member is installed between the lower ends of the insulators to form a substantially inverted V shape, and a power transmission line is supported at two points at the lower ends of the both suspended insulators, Furthermore, at least one of the upper and lower parts of the lightning arrester is attached to the center of the connecting yoke or the spacing member, so that the lightning arrester is immovable in the left and right direction, and the connecting yoke, the suspension insulator, and the spacing member are fixed. and a lightning arrester insulator for an overhead power transmission line, characterized in that the lightning arrester is arranged symmetrically with respect to a perpendicular line passing through the center of rotation of the connection yoke.