JP2508206Y2 - Suspended lightning arrester - Google Patents

Description

[Detailed description of the device]

[0001]

[Field of Industrial Application] The present invention quickly discharges an excessive current to a ground when a high current due to a lightning surge is applied to a transmission line and cuts off a follow-up current generated thereafter. The present invention relates to a suspension type lightning arrestor having a lightning protection function for preventing a wire accident.

[0002]

2. Description of the Related Art Conventionally, in a suspension type lightning arrester in which a current limiting element having a non-linear voltage-current characteristic is provided in a cap portion of an insulator body, a grounding side cap is provided at an upper end and a lower end of a containing portion of the current limiting element. The electrode and the charging side cap electrode are respectively fixed, and the grounding side cap electrode and the cap fitting and the charging side cap electrode and the pin fitting or the clevis fitting are electrically connected.

[0003] For example, in Japanese Patent Application No. 02-318342, a protrusion protruding in the horizontal direction is formed at the lower end of the pin fitting, and one end of the lead wire is screwed to the tip surface of the protrusion. The other end is fixed to the voltage-applying side cap electrode by a caulking pin. The lead wire is attached to the pin fitting after the cap fitting and the pin fitting are fixed to the insulator body.

[0004]

However, in the above-mentioned conventional suspension type lightning arrester, one end of the lead wire between the charge-side cap electrode and the pin fitting is screwed to the side surface of the pin fitting. Therefore, the screwing work must be done from the side of the insulator body. However, when mounting, there is a problem in that the screwing work is very troublesome and difficult because the cap portion and the fold portion of the insulator main body interfere.

Further, due to deterioration of the current limiting element and the like, the current limiting element becomes conductive and the pressure inside the accommodating portion rises, so that the cap electrodes on the ground side and the charging side are disengaged from the upper and lower ends of the accommodating portion. , The arc may be emitted to the outside. However, as shown in FIG. 5, since the other end of the lead wire 34 is fixed to the side surface of the pin fitting 35, the surface of the pin fitting 35 to which the lead wire 34 is fixed is centered on the axis of the pin fitting 35. The radiation of the pin metal 35
The connection point 37 between the power-supply-side cap electrode 36 and the power-supply-side cap electrode 36 is located off the line connecting the centers of the pin fitting 35 and the power-supply-side cap electrode 36. Therefore, at the time of arc discharge, after the charging-side cap electrode 36 is disengaged from the lower end of the accommodating portion, as shown by a chain line in FIG. It may happen.
There is also a problem that the pleats 39 are damaged due to the collision and the shade of the lightning protection insulator is chipped.

The present invention has been made in order to solve the above problems, and its purpose is to easily attach a lead wire and to prevent the lightning insulator from being chipped , and further Current element followed by lightning surge
Suppresses the main body of the insulator from being burned when it is conducted by the flow.
It is to provide a suspension type lightning arrestor that can ensure mechanical strength .

[0007]

In order to achieve the above object, according to the present invention, a cap metal fitting is fixed to a central head portion of a cap portion of an insulator body, and a bearing hole is formed in an upper portion of the cap metal fitting. , The upper part of the clevis metal fitting is fixed to the inner side of the central head part, and the bearing hole of another insulator is supported by the shaft at the lower end of the clevis metal fitting .
A bearing hole is formed, and a current limiting element having a non-linear voltage-current characteristic is housed in the housing formed in the cap portion of the insulator body, and the cap metal fitting and the ground-side cap electrode of the housing are connected. In the suspension type lightning arrestor in which the space and the clevis fitting and the charging-side cap electrode of the housing are electrically connected,
Connect the charging side cap electrode of the housing part to the
In the lateral right and left ends of the bearing hole, and is arranged on a line substantially perpendicular to the axis of the shaft, the bearing of the clevis bracket
Only the corresponding side portion and the left and right ends of the holes to form a projection toward the Division collector side cap electrodes, which are connected between the lower surface and the voltage application side cap electrodes of the projections by a lead wire.

[0008]

Therefore, according to the present invention, since the lead wire is attached to the lower surface of the projection formed at the lower end of the clevis fitting, the lead wire can be easily attached from below the insulator body. Further, the power-capping-side cap electrode is arranged laterally of the lower end of the clevis metal fitting and on a line substantially orthogonal to the axis of the shaft, and the projection of the clevis metal fitting projects toward the power-charging-side cap electrode. . Therefore, the lead wire can be arranged on the line connecting the center of the clevis metal fitting and the cap electrode on the power-supply side, and the lead wire can be shortened as much as possible, so that the current limiting device continues the current surge following the lightning surge.
The insulator body does not rotate or move even if the cap electrode on the charging side comes off due to conduction by the flow.
The back surface is prevented from chipping and the current limiting element
The path of the arc to is away from the back of the insulator body
Prevents the center of the insulator body from being burnt out, increasing the mechanical strength.
Can be secured .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the insulator main body 1 is formed with a cap portion 2, a plurality of fold portions 3 formed in an annular shape and concentrically on the inner side surface of the cap portion 2, and further on the central upper portion of the cap portion 2. It is integrally formed with the covered cylindrical head portion 4. A cap fitting 5 is fixed to the head 4 with cement 6, and a large diameter upper end portion of a clevis fitting 7 is fixed to the inner top of the head 4 with cement 8. A bearing hole 9 is formed in the upper portion of the cap fitting 5, and
A bearing hole 10 is also formed in the lower end portion of the clevis metal fitting 7, and the cap metal fitting 5 and the clevis metal fitting 7 are connected by inserting the shaft 11 into both the bearing holes 9 and 10.

In the cap portion 2 of the insulator body 1, two element accommodating portions 12 are integrally formed at equal angles. A current limiting element 13 having a non-linear voltage-current characteristic is accommodated in the element accommodating portion 12, and the current limiting element 13 and a ground-side sealing electrode 14 adhered and fixed to both upper and lower end surfaces of the element accommodating portion 12. It is hermetically sealed by the voltage application side sealing electrode 15. Further, a ground-side cap electrode 16 as a ground-side electrode and a power-supply-side cap electrode 17 as a power-supply-side electrode are caulked and fixed to the outer peripheral portions of the upper and lower ends of the element housing portion 12. The grounding-side conductive unit 1 is provided between the grounding-side sealing electrode 14 and the grounding-side cap electrode 16 and between the charging-side sealing electrode 15 and the charging-side cap electrode 17, respectively.
8. A power-supply-side conductive unit 19 is provided. As shown in FIGS. 1 and 2, the charge-side cap electrode 17 at the lower end of the element accommodating portion 12 is lateral to the lower end of the clevis fitting 7 and on a line substantially orthogonal to the axis of the shaft 11. positioned.

The ground side cap electrode 16 is connected to the cap fitting 5 by a lead wire 20, and both ends of the lead wire 20 are connected by a caulking pin 21 and a screw 22. As shown in FIGS. 1 to 3, a protrusion 23 is provided at the lower end of the clevis metal fitting 7 in a direction toward the power-charging side cap electrode 17, that is, in a direction substantially orthogonal to the axis of the shaft 11. The lower surface is made horizontal and a screw hole 23a for terminal mounting is formed on the lower surface.

A lead wire 24 is connected between the lower surface of the charging-side cap electrode 17 and the clevis fitting 7.
That is, the one terminal fitting 25 fixed to the lead wire 24 is fixed to the position closest to the protrusion 23 of the charging side cap electrode 17 by the caulking pin 26, and the other terminal fixed to the lead wire 24. The metal fitting 27 is attached to the lower surface of the protrusion 23 by a screw 28 screwed into a screw hole 23a formed in the lower surface. Therefore, the lead wire 24 and both terminal metal fittings 25 and 27 are arranged on the line connecting the centers of the clevis metal fitting 7 and the power-supply-side cap electrode 17, and at the shortest distance between the power-charge side cap electrode 17 and the clevis metal fitting 7. Connected, the lead wire 24 is very short.

An arc guide 29 is horizontally supported by the cap metal fitting 5 in correspondence with the ground side cap electrode 16, and when the current limiting element 13 is in a conducting state and an arc is emitted to the outside, the arc is discharged. Can be turned to the outside. As shown in FIG. 4, the suspension type lightning arrestor thus constructed is connected in series to the support arm 30 of the steel tower, and the current limiting elements 13 are vertically connected to each other. The power transmission line L is attached. In addition, arc horns 31 and 32 are attached to the upper and lower ends of the suspension insulator series to prevent the surface flashover of the insulator.

Next, the operation of the suspension type lightning arrestor constructed as above will be described. Now, in the state shown in FIG.
Clevis metal fitting 7 of the suspension type lightning arrestor at the bottom from the power transmission line L
The lightning surge that invades the lead wire 24, the charging side cap electrode 17, the charging side conductive unit 19, the charging side sealed electrode 1
5, current limiting element 13, grounding-side sealing electrode 14, grounding-side conductive unit 18, grounding-side cap electrode 16, lead wire 20, and flow to cap fitting 5, and clevis fitting 7 of suspended type lightning insulator located further above Flows to the ground and is discharged to the ground.
Further, the subsequent current generated thereafter is suppressed and cut off by the restoration of the resistance value of the current limiting element 13, and the ground fault accident due to the operating voltage is suppressed.

Further, when the current limiting element 13 is deteriorated due to long-term use or an unexpected large-scale lightning surge enters, the current limiting element 13 becomes conductive and the internal pressure rises to cause an arc. When the cap electrodes 16 and 17 on the grounding side and the charging side are melt-broken and released, the arc is deflected by the arc guide 29 to the side of the insulator body 1 and then between the arc horns 31 and 32. Will be migrated.

At this time, the cap electrodes 16 and 17 on the grounding side and the charging side may be disengaged from the outer peripheral portions of the upper and lower ends of the element accommodating portion 12 due to internal pressure. However, as described above, one of the terminal fittings 25 of the lead wire 24 is fixed to the lower surface of the charging-side cap electrode 17 at a position closest to the clevis fitting 7, and the other terminal fitting 2 is attached.
7 is a projection 2 formed toward the charging-side cap electrode 17
3, the lead wire 24 and both terminal fittings 25 and 27 are attached to the clevis fitting 7 and the power-supply-side cap electrode 17.
Is arranged on a line connecting the centers of the lead wire 24 and the clevis metal fitting 7 with the shortest distance, and the lead wire 24 is very short. Therefore, unlike the conventional case, the capping electrode 17 on the charging side does not rotate around the caulking pin 26 and collide with the fold portion 3 of the insulator body 1 after the cap electrode 17 is detached, and prevents the lightning protection insulator from chipping. be able to.

The terminal fitting 27 of the lead wire 24 is attached to the clevis fitting 7 after the cap fitting 5 and the clevis fitting 7 are fixed to the insulator body 1. However, the terminal metal fitting 27 is the projection 23 formed on the clevis metal fitting 7.
Since it is screwed to the lower surface of the insulator with screws 28, the screwing operation can be easily performed from below the insulator body 1. Therefore, when the terminal fitting 27 is attached, the cap portion 2 and the fold portion 3 of the insulator body 1 do not become an obstacle, and the attachment can be easily performed.

[0018]

As described above in detail, according to the present invention, the lead wire can be easily attached to the clevis metal fittings, and the lightning insulator can be prevented from chipping and the projection can be prevented.
From the back of the insulator body to the arc path from the
Separated from each other, it is possible to suppress burnout of the central part of the insulator body, and
There is exhibited an excellent effect that Ru can ensure a degree.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an example of a suspended lightning arrester embodying the present invention.

FIG. 2 is a bottom view of a suspended lightning arrester.

FIG. 3 is a side view of the lower portion of the clevis fitting.

FIG. 4 is a front view showing a usage state of a suspended lightning arrester.

FIG. 5 is a bottom view of a conventional suspended lightning arrester.

[Explanation of symbols]

1 insulator main body, 2 cap portion, 4 head portion, 5 cap fitting, 7 clevis fitting, 9 bearing hole, 11 shaft, 12
Element housing portion (housing portion), 13 current limiting element, 16 grounding side cap electrode, 17 charging side cap electrode, 23 protrusion,
24 leads.

Claims (1)

(57) [Scope of utility model registration request] 1. A cap metal fitting is fixed to a central head portion of a cap portion of an insulator main body, a bearing hole is formed in an upper portion of the cap metal fitting, and an upper portion of a clevis metal fitting is fixed inside the central head portion. A bearing for supporting the bearing hole of another insulator by a shaft at the lower end of the clevis fitting.
An accommodating portion formed with a through hole and formed in the cap portion of the insulator body accommodates a current limiting element having a non-linear voltage-current characteristic, and is provided between the cap fitting and the ground-side cap electrode of the accommodating portion. And a suspension type lightning arrestor in which the clevis fitting and the charging side cap electrode of the accommodating section are electrically connected, the energizing side cap electrode of the accommodating section is connected to the clevis fitting of the clevis fitting.
In the lateral right and left ends of the bearing hole, and is arranged on a line substantially perpendicular to the axis of the shaft, the bearing of the clevis bracket
Only the corresponding side portion and the left and right ends of the holes to form a projection toward the Division collector side cap electrodes, characterized in that connected between the lower surface and the voltage application side cap electrodes of the projections by a lead wire suspension Type lightning arrester.