JP2713490B2 - Discharge electrode in lightning arrester - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention discharges an abnormal current due to a lightning strike to a transmission line to the ground promptly by a lightning arrester function, and suppresses and interrupts a continuation current to make the transmission line permanent. The present invention relates to a discharge electrode in a lightning arrester for preventing a ground fault.

[Prior Art] Conventionally, as shown in FIG.
When the transmission line 36 flows in the direction of the arrow due to wind pressure, the power-supplying arc horn 35 collides with the transmission line 36 as shown by a two-dot chain line,
Was damaged or the arc horn 35 on the power receiving side deformed, making it difficult to use it for a long time.

As a countermeasure, the arc horn 35 on the power application side and the power transmission line 36 are arranged in parallel as shown in FIG. 10 so that the arc horn 35 on the power application side does not interfere with the power transmission line 36. A horn 35 whose base end is curved is proposed.

[Problems to be Solved by the Invention] However, in this case, the transmission line
9 flows in the line direction, the arc horn 35 on the power application side may be located below the transmission line 36 as shown by the dashed line in FIG. At this time, if lightning strikes the transmission line 36 and discharge occurs between the transmission line 36 and the discharge electrode 38 of the lightning arrester 37, the transmission line 36 is damaged.

In order to prevent this, there is a method of taking measures such as lengthening the connecting link 34 or arranging the lightning arrester 37 above, but there is a problem that the device becomes large.

In addition, the support insulator
When the 33 swings in the direction perpendicular to the transmission line 36, the arc horn 35 on the power receiving side also swings to follow the swing. Accordingly, the arc horn 35 on the power receiving side and the power transmission line 36 are broken, and the arc horn 35 on the power receiving side and the power transmission line 36 interfere with each other.
It is necessary to place the arc horn 35 at a large distance from the power horn 36, and there is a problem that the mounting structure of the arc horn 35 on the power receiving side becomes large.

An object of the present invention is to provide a discharge electrode in a lightning arrester that prevents deformation of an arc horn on the power receiving side and damage to a transmission line, and prevents an increase in the size of the mounting structure of the arc horn on the power receiving side.

[Means for Solving the Problems] In order to achieve the above object, the first invention of the present application is to support a transmission line with respect to a support arm of a steel tower via an upper suspension bracket, a support insulator, and a lower suspension bracket. At the same time, the lightning arrester is suspended and supported on the supporting arm via a mounting adapter, while the lower suspension bracket is opposed to the discharge electrode on the power application side of the lightning arrester with a predetermined air discharge gap. In the discharge electrode of the lightning arrester equipped with the power-side arc horn,
The power-supply-side arc horn is disposed above the transmission line so that it can interfere with the power transmission-side arc horn. The gist is that a bending mechanism is provided.

The gist of the second invention is that an interference member capable of interfering with the transmission line is provided at the tip end side of the discharge electrode on the power application side.

[Function] The function of the first invention is that, when the power-supply-side arc horn interferes with the transmission line, the power-supply-side arc horn is bent by the bending mechanism provided in the power-supply-side arc horn to absorb external force. And prevent deformation of the power-supply-side arc horn and damage to the transmission line. Therefore, even when the arc horn on the power receiving side swings more than expected due to wind pressure, it interferes with the transmission line, and the arc horn on the power receiving side is not positioned below the transmission line.

The operation of the second invention is that the interference member of the arc horn on the power receiving side interferes with the transmission line, and the arc horn on the power receiving side is not positioned below the transmission line. To prevent the horn from having a large mounting structure.

Embodiment An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, a connecting metal fitting 2 is fixed to a tip end of a tower arm 1, and is connected to the connecting metal fitting 2 via a U clevis link 3 and an upper hanging metal fitting 4. Are swingably supported in the line direction (the left-right direction in FIG. 1) and the orthogonal direction (the direction orthogonal to the paper surface of FIG. 1).

An electric wire clamp 9 for supporting a power transmission line 8 via a connecting link 7 is supported by a connecting fitting 6a at the lower end of the suspension insulator string 5. The lower hanging bracket 6 is configured by the connecting bracket 6a and the connecting link 7. An arcing horn 1 is provided on the upper suspension fitting 4 and the connecting link 7 for minimizing damage to the flashover of the suspension insulator string 5 as much as possible.
0,11 are installed.

A mounting adapter 12 is fixed to the tip of the tower arm 1 by bolts, and a lightning arrester 13 is fixed to the lower surface of the adapter 12 by a plurality of bolts.

The lightning arrester 13 has a pressure-resistant insulation (not shown) formed in a cylindrical shape by a tensile material such as FRP, and a voltage-current characteristic mainly composed of zinc oxide (ZnO) housed in series therein. Non-linear current limiting elements not shown, and cap-shaped grounding and power-supplying side electrode fittings 14 and 15 fitted and fixed to both ends of the pressure-resistant insulating cylinder, and provided on the outer periphery of the pressure-resistant insulating cylinder It is composed of a mold rubber 16.

A pair of arcing rings 1 are provided at both ends of the lightning insulator 13.
The arcing rings 17 and 18 reduce the damage of the molding rubber 16 at the time of creeping along the surface.

The arcing ring 17 is attached to the mounting adapter 12.
The arcing ring 18 is attached to the electrode fitting 15 on the power application side. Further, a discharge electrode 19 on the power receiving side is provided at a lower end portion of the electrode fitting 15 on the power receiving side.
Are fastened and fixed by bolts.

An arc horn 20 is attached to the connection link 7 below the suspension insulator series 5. The arc horn 20 includes a support portion 20a supported by the connecting link 7, a bending mechanism K provided at the tip of the support portion 20a, and an arc horn body 20b mounted via the bending mechanism K. I have.

The arc horn 20 extends parallel to the mounting adapter 12 and is disposed above the power transmission line 8. An air discharge gap G having a predetermined gap length is provided between a discharge portion of the arc horn 20 and the discharge electrode 19 on the power application side.

Next, the configuration of the bending mechanism K of the arc horn 20 will be described.

As shown in FIGS. 2 to 4, a support member 21 is fixed to the tip of the support portion 20a of the arc horn 20 on the connection link 7 side. On the upper side of the base end side of the support member 21, there is provided a regulating piece 22 that is bent in an orthogonal shape. A through hole 21a is provided at the tip of the support member 21. The connection terminal 23 is fixed to the restriction piece 22 by welding.

A rotating member 2 to which an arc horn main body 20b is fixed is attached to one side surface of the support member 21 (the side on which the regulating piece 22 protrudes).
4 is rotatably arranged. The rotating member 24 is formed in a substantially oval shape on the front, and a through hole 24a is provided at the base end thereof.

Further, one side surface of the rotating member 24 (the arc horn main body 20)
On the side where b is fixed), a connection terminal 25 projecting orthogonally is fixed to the upper part of the through hole 24a by welding.

An elastic member 26 for restricting the rotation of the rotating member 24 is attached to the other side surface of the supporting member 21 (the side on which the arc horn main body 20b is not fixed).

The elastic member 26 is provided with a support portion 27 that is bent into a U-shape in cross section and engages with the distal end of the support member 21. Element
28. The support portion 27 has a through hole.
27a is provided.

The support member 21, the rotation member 24, and the elastic member
The bolt 26 is inserted into the hole 26 with the through holes 21a, 24a, 27a aligned with each other, and the double nut 30 is screwed so that the rotating member 24 can rotate.

Therefore, the tip of the rotating member 24 is connected to the regulating piece 22 and the spring member.
28, the tip of the rotating member 24 is the bolt
It is designed to rotate around 29.

In addition, the upper and lower side pieces of the support portion 27 of the elastic member 26 are support members.
The elastic member 26 is not rotatable because it is engaged with the upper and lower sides of the tip of the elastic member 21. When the distal end of the rotating member 24 rotates downward, only the spring member 28 is pressed downward. It has become.

The caulking terminals T of both ends of the flexible lead wire R are connected to the connection terminals 23 and 25 by bolts and nuts. Therefore, the support member 21 and the rotating member
24 is reliably secured by the flexible lead wire R.

The operation of the discharge electrode of the lightning arrester configured as described above will be described.

Now, when a large current is applied to the transmission line 8 by lightning, this current is applied from the wire clamp 9, the connecting link 7, the lower hanging bracket 6, the bending mechanism K, and the arc horn 20 through the air discharge gap G. To the current limiting element (not shown) of the lightning arrester 13 from the electrode fitting 15, to the tower arm 1 via the grounding electrode fitting 14 and the mounting adapter 12, and further to the tower to ground. Is discharged. afterwards,
The following current is suppressed and cut off by the current limiting element of the lightning arrester 13.

Now, since the arc horn 20 has a moment to turn downward due to its own weight, the tip of the turning member 24 tends to turn upward around the bolt 29. But,
Since the rotation of the rotation member 24 is restricted by the restriction piece 22 of the support member 21, the arc horn 20 does not rotate downward and the distance of the air discharge gap G can be kept constant.

Also, when the suspension insulator string 5 swings in the direction of the transmission line due to wind pressure, the entire arc horn 20 swings vertically, but since the arc horn 20 is located above the transmission line 8,
If the tip of the arc horn main body 20b generates a flow in the direction of a larger line than expected, it may interfere with the transmission line 8 as shown by a chain line in FIG.

In this case, when the tip of the arc horn main body 20b interferes with the power transmission line 8, the tip of the arc horn main body 20b tries to turn upward, so that the tip of the turning member 24 turns downward about the bolt 29. And

Then, the rotating member 24 presses the spring member 28 of the elastic member 26 downward, and the elastic member 26 tries to rotate downward around the bolt 29. However, both upper and lower pieces of the support portion 27 are support members.
Since it is engaged with the upper and lower side surfaces of the tip of 21, the rotation thereof is prevented.

Therefore, as shown in FIG. 3, the tip of the rotating member 24 presses only the spring member 28 of the elastic member 26 downward against its elastic force. As a result, the arc horn body 20b is bent by the bending mechanism K. And then the arc horn body
When the 20b does not interfere with the transmission line 8, the arc horn body 2
Ob returns to its original state due to its own weight and the elastic force of the spring member 28.

Accordingly, since the impact force when the arc horn 20 interferes with the transmission line 8 can be absorbed by the bending mechanism K, the impact given to the transmission line 8 can be reduced. As a result, damage to the transmission line 8 can be reduced, and deformation of the arc horn 20 can be prevented.

Although the conventional arrangement is such that the horn 20 does not interfere with the transmission line 8, in the embodiment of the present invention, this interference is actively utilized, so that the mounting structure of the arc horn 20 can be downsized.

Further, since the arc horn 20 is provided on the connecting link 7 so as to interfere with the power transmission line 8, the arc horn 20 is not positioned below the power transmission line 8 unlike the related art. As a result, it is possible to prevent a discharge caused by an accident current such as a lightning strike between the transmission line 8 and the discharge electrode 19 on the power receiving side, thereby preventing the transmission line 8 from being blown or melted.

In this embodiment, the bending mechanism K is provided at the base end of the arc horn 20. However, the bending mechanism K having the same configuration may be provided at the distal end side of the arc horn 20, or the bending mechanism K may be attached to the arc horn 20.
It is also possible to provide a plurality of according to the application.

Also, as shown in FIG. 6, when the tip of the arc horn 20 swings up and down due to wind pressure, a support rod projecting vertically so that the tip reliably interferes with the transmission line 8.
It is also possible to provide an interference member 32 having a substantially quadrangular frame shape in which the corners are arc-shaped on 31a and 31b.

Further, as shown in FIG. 7, it is also possible to provide an interference member 32 having a substantially triangular planar shape below the tip of the arc horn 20.

When the bending mechanism K of the embodiment is provided at the tip of the arc horn 20 as shown in FIG. 8, the support portion 27 of the elastic member 26 is provided with support bars 31a and 31b projecting vertically. The support rods 31a, 31b
It is also possible to provide so as to be supported by. In this case, the electric field concentration of the bending mechanism K is reduced, and corona discharge can be prevented.

The present invention is not limited to the above-described embodiment, and can be arbitrarily changed without departing from the spirit of the present invention.

[Effects of the Invention] As described in detail above, according to the present invention, since the bending mechanism of the discharge electrode on the power receiving side absorbs external force, deformation of the discharge electrode on the power receiving side and damage to the transmission line are prevented, Furthermore, unlike the conventional case, since the discharge electrode on the power receiving side is configured to interfere with the transmission line, there is an effect that the size of the discharge electrode on the power receiving side can be prevented from increasing.

In addition, since the discharge electrode on the power application side reliably interferes with the transmission line due to the interference member, no discharge occurs between the transmission line and the lightning arrester, so that it is possible to prevent fusing and melting of the transmission line. There is an effect that can be.

[Brief description of the drawings]

FIG. 1 is a front view showing the entire configuration according to the present invention, FIG. 2 is an exploded perspective view showing the configuration of a bending mechanism, FIG. 3 is an explanatory view showing a state where a spring member is curved by an arc horn body,
FIG. 4 is a partially cutaway plan view showing the assembled state of the bending mechanism, FIG. 5 is a partial front view showing the assembled state of the bending mechanism,
6 is a perspective view in which a quadrangular frame-shaped interference member is provided in the arc horn, FIG. 7 is a perspective view in which a substantially triangular interference member is provided in the arc horn, and FIG. 8 is a bending mechanism of the arc horn. FIG. 9 is a front view showing the entire structure of the conventional art, and FIG. 10 is a plan view showing the planar shape of the arc horn. DESCRIPTION OF SYMBOLS 1 ... Tower arm, 4 ... Upper hanging bracket, 5 ... Suspension insulator as supporting insulator, 6 ... Lower hanging bracket, 8 ... Transmission line, 12 ...
Mounting adapter, 13… Lightning insulator, 19… Discharge electrode on the power application side,
20 ... Arc horn, 32 ... Interference member, K ... Bending mechanism, G ...
Aerial discharge gap.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kiyotomi Dokai 11-1-206 Nakakita-cho, Neyagawa-shi, Osaka (72) Inventor Tetsuya Nakayama 98, Minamiyama, Iwaishi, Rock, Fuso-cho, Niwa-gun, Aichi Prefecture (72) Inventor Eiji Ito Komaki City, Aichi Pref.

Claims (2)

(57) [Claims] A power transmission line is supported on a support arm of a tower via an upper suspension bracket, a support insulator, and a lower suspension bracket, and a lightning arrester is suspended and supported on the support arm via a mounting adapter. On the other hand, in the discharge electrode of the lightning arrestor provided with an arc horn on the power-supply side facing the power-supply-side discharge electrode of the lightning arrester with a predetermined air discharge gap on the lower suspension fitting, The arc horn is disposed above the power transmission line so that it can interfere with the power transmission line, and at least one of the power supply side arc horns has a bending mechanism that allows the power supply side arc horn to bend when it interferes with the power transmission line. A discharge electrode in a lightning arrester. 2. The discharge electrode in a lightning arrester according to claim 1, wherein an interference member capable of interfering with a transmission line is provided at a tip end of the discharge electrode on the power application side.