JPS63108619A - Arresting insulator - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Purpose of the Invention (Industrial Field of Application) The present invention provides a method for detecting abnormally large currents flowing through power transmission lines due to lightning strikes.
The present invention relates to a lightning arrester device that can quickly discharge lightning to the ground through its protection function, suppress and cut off follow-on current, and prevent permanent ground faults.

(Prior Art) Conventionally, as shown in FIG. 5, as a lightning arrester device for a power transmission line, a hanging insulator 5 for a power transmission line 7 is attached to a support arm l of a steel tower.
1, a lightning arrester 52 is suspended at a predetermined distance from the suspended insulator 51, and the lower ends of the suspended insulator 51 and the lightning arrester 52 are connected by a connecting conductor 53.

(Problems to be Solved by the Invention) However, in the conventional lightning arrester device for power transmission lines, since the lightning arrester 52 is suspended from the lower surface of the support arm 1 independently of the suspension insulator 51, In order to avoid colliding with the lightning arrester 52 when the insulator 51 swings, it is necessary to separate both the insulators 51 and 52 by a predetermined distance, and as a result, the distance between the tower body and the energized end of the lightning arrester 52 is short. Therefore, there was a problem that it was difficult to ensure a safe working distance. If an attempt is made to solve this problem, it will be necessary to modify the support arm 1 to increase its protrusion length, making it difficult to apply it to an existing power transmission line support insulator device.

An object of the present invention is to provide a lightning arrester device that solves the above problems.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides gripping fittings on the grounding side and on the energizing side that are fitted and fixed to both ends of the support insulator forming a bar-like structure. Brackets each having a gripping member on each side are connected so as to extend laterally, and a ground side electrode and a energized side electrode provided at both ends of the lightning arrester are removably engaged with both gripping members. A method is adopted in which the lightning arrester is installed in parallel with the support insulator.

(Function) By adopting the above-mentioned means, the present invention functions as follows.

Since the lightning arrester can be brought close to the support insulator, it is easy to ensure the insulation distance between the lightning arrester and the tower body, and therefore, it can be easily applied to an existing power transmission line support insulator device without modifying the tower body. Can be done. In addition, since the lightning arrester and support insulator are installed side by side, when the power transmission line swings, both insulators rotate in synchronization, so there is no risk of them colliding with each other, and the lightning arrester device can be held stably, ensuring reliability. can be improved.

Furthermore, since no external force acts on the lightning arrester other than its own weight, it is possible to make the lightning arrester smaller and lighter and to simplify its structure.

(Example) Hereinafter, an example embodying the present invention will be described based on FIGS. 1 to 3.

A hanging metal fitting 2 is fixed to the tip of the support arm 1 of the steel tower, and a U clevis link 3 is rotatably connected to the hanging metal fitting 2. The insulator 5 is swingably supported. A wire clamp 8 that supports a power transmission line 7 is supported at the lower end of the support insulator 5 via a connecting link 6 connected by a connecting pin. This support insulator 5 consists of a tensile insulating rod 9 made of reinforced plastic (FRP), a rubber mold 10 formed on the outer periphery of the insulating rod 9, and a fixed grounding which is fitted onto both upper and lower ends of the insulating rod 9 and crimped. It is constituted by gripping fittings 11 and 12 on the side and the charging side.

Brackets 13.14 are attached to the upper and lower gripping fittings 11.12 in the track direction, respectively.

The lower bracket 14 is attached to the gripping metal fitting 1 as shown in FIG.
2, a pair of upper and lower split-type tightening rings 16 and 17 are tightened and fixed by bolts 15, and the upper tightening ring 1
a horizontal support arm 18 sandwiched between the two arms 1 and 6; a tilted support arm 19 sandwiched between the lower tightening ring 17;
8. ．． 19, and a supporting metal fitting 20 as a gripping member fixed to the tip end of the holding member 19. A rotation preventing means (not shown), such as a key, is provided between the gripping metal fitting 12 and the tightening ring 16,17.

On the other hand, the upper bracket 13 is also formed in the same manner as the lower bracket 14, except that a camp-shaped engagement fitting 21 is used as a gripping member in place of the support fitting 20. In this embodiment, a lightning arrester 22 is removably mounted between the supporting metal fittings 20 and the engaging metal fittings 21 of both brackets 13 and 14. This lightning arrester 22 is constructed by connecting a pair of upper and lower lightning arrester units (23 and 24) in series, which will be described in detail later.
The protrusion 25a formed on the upper surface of the metal fitting 21 is engaged with the recess 21a of the engaging metal fitting 21, and the energizing side electrode 26 is received by the supporting metal fitting 20 via a coiled compression spring 27.

Note that a shunt 28 for energization is attached to this compression spring 27.

An engagement step 20a is formed near the outer periphery of the upper surface of the support fitting 20, and a holding cylinder 30 that can be opened and closed by a hinge 29 is fixed to the outer periphery by a bolt 31, as shown in FIG.
The upper end of the holding tube 30 restricts the movement of the lightning arrester 22 in the horizontal direction and allows relative movement in the vertical direction with respect to the outer peripheral surface of the engagement step 26a formed on the lower surface of the energizing side electrode 26. It is mated so that

The load value and amount of deflection of the compression spring 27 are determined by fluctuations in the load of the power transmission line 7 acting on the support insulator 5, wind pressure, snow accumulation, etc., and changes in the support insulator 5 and lightning arrester 2 due to temperature changes.
Due to the difference in thermal expansion coefficient between the two insulators 5 and 22, the value is set appropriately so that the relative movement that occurs between the two insulators 5 and 22 can be absorbed. Incidentally, protrusions 20b, 2 for regulating the position of the compression spring 27 are provided on the opposing surfaces of the support fitting 20 and the charging side electrode 26.
6b is formed.

On the other hand, the pair of upper and lower horizontal support arms 18 are provided with mounting rods 3.
An arcing ring 33 is supported so as to surround the supporting insulator 5 and the lightning arrester 22 via the arcing ring 33 which also has the function of mitigating the electric field and preventing corona.

Here, an example of the lightning arrester 22 will be explained based on FIG. 2.

The pair of upper and lower lightning arrester units 23 and 24 constituting this lightning arrester 22 are constructed in the same manner as in Habo, so only the lower lightning arrester unit 24 will be described.

A camp-shaped connecting fitting 35 and the voltage-side electrode 26 are fitted and fixed with an adhesive 36 on the outer periphery of both upper and lower ends of the voltage-resistant insulation M34, which is formed into a cylindrical shape from a tensile material such as reinforced plastic (FRP). ing. The connecting fitting 35 has a flange portion 35a on the outer periphery, and the upper lightning arrester unit 23
It is connected to a flange portion 37a formed on the side connecting fitting 37 by a bolt 38 (not shown).

The voltage-resistant insulating cylinder 34 has a non-linear resistance element unit 39 built therein. This nonlinear resistance element unit 3
Reference numeral 9 denotes a plurality of non-linear resistance elements 40 made of zinc oxide or the like having non-linear voltage-current characteristics connected and fixed in series, electrode fittings 41 and 42 connected to both upper and lower ends thereof, and these members. It is configured with a holding material 43 for holding. Moreover, the upper electrode fitting 41 and the connecting fitting 35
A coiled compression spring 4 with a shunt 44 between
5 and a spring receiver 46 are interposed. A rubber mold 47 having a large number of cylindrical portions 47a is molded around the outer periphery of the voltage-resistant insulating tube 34, some of which are inserted into the gap between the non-linear resistance element unit 39 and is also filled, and is also exposed on the upper surface of the connecting fitting 35 through a passage 35b formed in the connecting fitting 35.

A concave pressure release port 47b is formed in the rubber mold 47 corresponding to the pressure release port 34a.

By the way, the cylindrical portion 10 of the support insulator 5 and the lightning arrester 22
The gaps 47a and 47a are sufficiently separated in the contaminated area to prevent bridge flash caused by different degrees of contamination.

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

Now, if an abnormally large current is applied to the power transmission line 7 due to a lightning strike,
This current is applied to the connecting link 6, the connecting pin 4, the gripping fitting 12,
It flows through the bracket 14, the compression spring 27, and the shunt 28 to the power-supplying electrode 26 of the lightning arrester 22, and further from the electrode fitting 42, the nonlinear resistance element 40, the electrode fitting 41, the shunt 44, the spring receiver 46, and the connecting fitting 35. It flows into the upper lightning arrester unit 23, the ground side electrode 25, and the bracket 1.
3, gripping fitting 11, connecting bottle 4, U clevis link 3,
It flows through the hanging fitting 2, to the support arm 1, and further flows to the steel tower and is discharged to the ground. Subsequent currents that occur thereafter are suppressed and blocked by the nonlinear resistance element 40.

If the non-linear resistance element 40 is abnormally heated due to abnormal lightning that exceeds expectations and the internal pressure increases, the voltage-resistant insulating cylinder 34
Pressure is released to the outside from the pressure relief port 34a by melting the rubber mold 47, and at this time, the emitted arc moves between the arcing rings 33, so that the lightning arrester 22 is prevented from burning out.

Now, in the above embodiment, the gripping fitting 11.1 of the support insulator 5 is
Since the lightning arrester 22 is removably supported on the support insulator 5, the lightning arrester 22 can be brought close to the support insulator 5, making it easy to secure the insulation distance between the lightning arrester and the tower body, and therefore without modifying the tower body. It can be easily applied to existing power transmission line support insulator devices. In addition, since the lightning arrester 22 and the support insulator 5 are installed side by side, when the power transmission line 7 swings, both insulators rotate synchronously, so there is no risk of them colliding with each other, and the lightning arrester device can be held stably and reliably. can improve sexual performance. Furthermore, since no external force acts on the lightning arrester 22 other than its own weight, the lightning arrester can be made smaller and lighter, and its structure can be simplified.

Note that the present invention can also be embodied as follows.

(1) Insulator 5 supporting arcing ring 33 and lightning arrester 2
It is also possible to attach them to both.

(2) As shown in FIG. 4, the lower end of the lightning arrester 22 is engaged with the engagement recess 20c formed on the upper surface of the support fitting 20, and the lower end of the lightning arrester 22 is inserted between the ground side electrode 25 and the engagement fitting 21 of the bracket 13. The aforementioned compression spring 27 and holding cylinder 30 are interposed. In this other example, the electrical continuity between the grounding side electrode 25 and the engaging metal fitting 21 and between the energizing side electrode 26 and the supporting metal fitting 20 is improved compared to the above embodiment.

Effects of the Invention As detailed above, this invention allows the lightning arrester to be brought close to the support insulator, making it easy to ensure the insulation distance between the lightning arrester and the tower body. It can be easily applied to support insulator devices for power transmission lines. In addition, since the lightning arrester and support insulator are installed together, when the power transmission line swings, both insulators rotate synchronously, so there is no risk of them colliding with each other, and the lightning arrester device can be held stably, improving reliability. can do. Furthermore, since no external force acts on the lightning arrester other than its own weight, the lightning arrester can be made smaller, lighter, and simpler in structure.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment embodying this invention;
Fig. 2 is an enlarged half-longitudinal cross-sectional view of the main part, Fig. 3 is an enlarged exploded perspective view showing the support structure of the energized side electrode of the lightning arrester, and Fig. 4 is a partially omitted cross-sectional view showing another example of the present invention. , FIG. 5 is a side view showing a conventional example. DESCRIPTION OF SYMBOLS 1... Support arm, 5... Support insulator, 7... Power transmission line, 9... Tension-resistant insulation rod, 11.12... Gripping metal fitting,
13゜14...Bracket, 20...Supporting metal fittings, 2
1... Engaging metal fitting, 22... Lightning arrester, 23.24.
...Lightning insulator unit, 25...Grounding side electrode, 26.
...Electricity side electrode, 27... Compression spring, 40... Non-linear resistance element.

Claims (1)

[Scope of Claims] 1. A bracket having a gripping member at the tip end is attached to each of the grounding side and energizing side gripping fittings that are fitted and fixed to both ends of a rod-shaped support insulator so as to extend laterally. A lightning arrester characterized in that the lightning arrester is connected in parallel with the supporting insulator, and the grounding side electrode and the energizing side electrode provided at both ends of the lightning arrester are removably engaged with both gripping members. Insulator device. 2. The protrusion provided on the grounding side electrode or the charging side electrode of the lightning arrester is engaged with the recess formed in the gripping member of the bracket on the grounding side or the power supplying side, and The charging side electrode or the grounding side electrode of the lightning arrester is pressed into contact with the gripping member via a compression spring, and a holding cylinder is tightened and fixed to the outer periphery of the gripping member, and the upper end of the holding cylinder is connected to the charging side. The lightning arrester device according to claim 1, wherein the lightning arrester device is fitted so as to be movable relative to the outer peripheral surface of the engagement step formed on the electrode or the ground side electrode.