JP2547355Y2 - Discharge electrode structure on power application side in lightning arrester insulator for transmission line - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge electrode structure on the power application side of a lightning arrester for a transmission line.

[0002]

2. Description of the Related Art As a conventional lightning arrester, a supporting insulator comprising a plurality of suspension insulators connected in series to a supporting arm of a tower via an upper suspension fitting is suspended at a lower end thereof. A horn supporting a transmission line via a lower metal fitting, and a lightning arrester attached to a support arm or an upper hanging metal fitting via an attachment adapter, and a horn supported by the lower hanging metal fitting at a lower end portion of the lightning insulator. And a discharge electrode on the ground side, which is opposite to the discharge electrode on the power application side having a predetermined air discharge gap. As shown in FIG. 3, a ring-shaped electrode having a discharge portion formed in a straight line, that is, an oval-shaped discharge electrode portion 30 as viewed from the side is provided at the tip of the discharge electrode.

[0003] Further, even when the support insulator swings in the line direction due to wind pressure on the transmission line or the like, the change in the air discharge gap length falls within an allowable value within an assumed swing range. In particular, consideration must be given to the suppression of expansion of the air discharge gap from the viewpoint of securing protection characteristics for the supporting insulator when a lightning surge current flows. In addition, with respect to the swing in the direction perpendicular to the line, there is little difficulty in securing the allowable value from the viewpoint of the mounting arrangement of the lightning arrester.

When a lightning surge current enters the transmission line, the current flashes from the discharge electrode on the power application side to the discharge electrode on the ground side through the air discharge gap and is guided to the discharge electrode on the ground side. -Discharge from the mounting adapter to the support arm of the tower through the resistance element whose current characteristics are non-linear, suppress and block the continuation current based on the operating voltage that occurs thereafter, without causing flashover on the support insulator side. It is designed to prevent accidents involving accidents.

[0005]

However, in the application of the above conventional lightning arrester insulator device, there are cases where the weather conditions are severe and it is necessary to assume a larger swing range of the supporting insulator supporting the transmission line in the line direction. is there. In such a case, in order to keep the variation width of the air discharge gap length between the two discharge electrodes to a predetermined value, the discharge electrode portion 30 having an oval shape is used.
Must be further increased, and the length of the discharge electrode on the power application side becomes longer. For this reason, there has been a problem that it becomes difficult to attach the support insulator to the support insulator, or the instability in swinging behavior increases.

The present invention has been made to solve the above-mentioned conventional problem. The purpose of the invention is to solve the problem between a power supply side and a ground side discharge electrode when a transmission line swings in the line direction due to wind pressure or the like. In addition to suppressing the change of the air discharge gap length to a predetermined allowable value, the overall length of the discharge electrode on the power application side in the longitudinal direction is shortened as compared with the related art, and the size is reduced. It is an object of the present invention to provide a discharge electrode structure on the power application side in a lightning arrester for a transmission line which can be easily applied to a power line.

[0007]

According to the present invention, in order to achieve the above-mentioned object, the supporting insulator can be swung about the upper suspension point via the upper suspension bracket on the supporting arm of the tower. At the lower end of the supporting insulator via a lower hanging bracket, while supporting the lightning arrester in the line direction on the supporting arm side via a mounting adapter, A power-supplying-side discharge electrode is attached to the lower suspension bracket, and a grounding-side discharge electrode that is opposed to the power-supplying-side discharge electrode with a predetermined air discharge gap is supported on the lightning arrester. In the device, a pair of horizontal
A long ring-shaped discharge part is provided, and each horizontal ring-shaped discharge part is
Arranged so that it is located in a pair of left and right vertical planes when viewed from the direction
And, their taking a means of each pair of discharge portions, wherein facing the ground side discharge electrode of these towards the discharge electrode of the ground side in an arc shape discharge portion comprising a concave.

[0008] The invention of claim 2, wherein in claim 1, wherein the center of the arc-shaped discharge portion to both a ring-shaped discharge portion so as to be located respectively in the vicinity of the bottom discharge end of the discharge electrode of the ground-side You have set.

Further, the invention according to claim 3 is the invention according to claim 1.
In or 2, its the longitudinal centers of both arcuate discharge portion, the upper suspension point of the support insulator and the bottom discharge end of the ground side discharge electrode, that is, straight nearby connecting the pivot center of the supporting insulator
Each is set.

[0010]

According to the first aspect of the present invention , one of the discharge electrodes on the power receiving side is provided.
Since the arc-shaped discharge portions are formed on the pair of horizontally-long ring-shaped discharge portions, respectively, a reference for setting a predetermined air discharge gap length in the stationary state as compared with the conventional shape in which the pair of horizontally-long arc-shaped discharge portions is linear. In addition to points, more parts close to the value can be provided. Therefore, when the transmission line swings in the line direction due to wind pressure and the like, and the supporting insulator swings in the line direction together with the discharge electrode on the power application side, both ends of the pair of horizontally long arc-shaped discharge portions are connected to the discharge electrode on the ground side. The change in the air discharge gap length can be reduced by the amount approached. This means that when the change is the same, the size of the ring-shaped discharge portion in the longitudinal direction can be reduced as compared with the conventional case, and the size of the entire discharge electrode can be reduced.

[0011] Also, the invention of claim 2, wherein, since the center of the arc of a pair of horizontally arcuate discharge portion is set to the vicinity of the bottom discharge end of the line perpendicular to the direction as viewed from the ground side of the discharge electrodes, stationary In this state, since all of the arc-shaped discharge portions have a predetermined air discharge gap length, a change width of the air discharge gap length when the supporting insulator swings in the line direction together with the discharge electrode on the power application side, In particular, the width of expansion can be further suppressed, so that the length of the ring-shaped discharge portion in the longitudinal direction can be reduced as compared with the related art, and the entire discharge electrode can be reduced in size.

[0012] Further, the invention according to claim 3 provides a pair of horizontal members.
The center in the longitudinal direction of the arc-shaped discharge part of the long ring-shaped discharge part,
Having respectively located straight near connecting the swing center of the lowermost discharge end and the support insulators of the ground side discharge electrode, transmission lines swung into line direction by wind pressure or the like, the discharge supporting insulator is voltage application side When reciprocating in the line direction together with the electrodes, the arc-shaped discharge portion is displaced substantially evenly in the swing direction, so that the longitudinal dimension of the arc-shaped discharge portion can be set to the minimum necessary. The size of the entire discharge electrode can be reduced.

[0013]

FIG. 1 shows an embodiment of the present invention.
A description will be given based on FIG. As shown in FIG. 1, a suspension bracket 2 is fixed to a support arm 1 of a tower, and a U clevis link 3 is supported on the suspension bracket 2 so as to be swingable in an arbitrary direction. An upper horn fitting 4 is connected to a lower end of the support horn, and an upper end of a supporting insulator 6 formed by connecting a plurality of suspension insulators 5 in series is connected to a center of the fitting 4. A socket clevis link 7 is connected to a lower end of the support insulator 6, a lower horn mounting bracket 8 is connected to a lower end of the link 7, a connecting link 9 is connected to a central portion thereof, and an electric wire clamp 10 is further connected. The power transmission line 11 is mounted via the.

The upper and lower horn mounting brackets 4, 8
The upper and lower arc horns 12 and 13 for preventing creeping of the support insulator 6 on the surface are supported on the upper and lower horns. on the other hand,
A mounting adapter 14 is cantilevered on the support arm 1 in the line direction.
The upper end of 5 is fixed by bolts. This lightning arrester 15 is a resistance element 1 having a non-linear voltage-current characteristic.
6 and a rubber-molded outer casing 17 outside, and electrode fittings 18 and 19 are fitted and fixed to the upper and lower parts. A ground-side discharge electrode 20 is supported by the power-supply-side electrode fitting 19. Further, arc rings 21 and 22 for preventing creeping flashing of the lightning arrester 15 are attached to the mounting adapter 14 and the electrode fitting 19.

The right arm 8a of the lower horn mounting bracket 8 supports a discharge electrode 27 on the power application side, which will be described in detail later, comprising a support rod 23 and a ring-shaped discharge part 25. Reference numeral 28 denotes a balance weight supported by the lower arc horn 13 so that the discharge electrode 27 on the power application side and the lower arc horn 13 are balanced in weight.

In the lightning arrester device constructed as described above, if a lightning surge current enters the power transmission line 11, this current is transmitted to the wire clamp 10, the connecting link 9, the lower horn fitting 8, the support rod 23 and the ring-shaped. Through the discharge portion 25, the air gap G between the two discharge electrodes 27 and 20 is flashed over to reach the ground-side discharge electrode 20. Then, it flows to the support arm 1 through the electrode fitting 19, the resistance element 16, the electrode fitting 18, and the mounting adapter 14, and is discharged to the ground.
Further, the subsequent current based on the operating voltage generated thereafter is suppressed and cut off by the restoration of the resistance value of the resistance element 16 and the air discharge gap G, thereby preventing a ground fault accident.

Next, the discharge electrode 27 on the power application side, which is a main part of the present invention, will be described. The lower horn mounting bracket 8
The base end of a support rod 23 made of a conductor constituting the discharge electrode 28 on the power application side is fastened and fixed to the right arm portion 8a by a bolt 24, and a pair of ring-shaped discharge portions 25, 25 is provided at the front end thereof. They are connected in parallel to each other via a connection plate 26. The ring-shaped discharge portions 25 are opposed to the ground-side discharge electrode 20 with a predetermined air discharge gap G. Further, the upper portion of the ring-shaped discharge portion 25 arc-shaped discharge portion 25a to be concave toward the discharge electrode 20 of the ground side is formed, the center of the arc T ₁ is the lowest of the ground side discharge electrode 20 It is located at a point, that is, near the lowermost discharge end O ₂ , and has an arc T ₁ having a radius R.

Therefore, when the support insulator 6 swings in the line direction in FIG.
The change in the air discharge gap G is kept within an allowable value, and the discharge characteristics are stabilized. That is, in the stationary state, all the air discharge gaps G have a radius R of the arc T ₁ of the arc discharge portion 25a.
Therefore, the width of change of the air discharge gap G when the supporting insulator 6 swings in the line direction together with the discharge electrode 25 on the power-applying side, particularly the width of expansion, can be suppressed. Thus, the length of the ring-shaped discharge portion 25 in the longitudinal direction can be reduced, and the size of the entire discharge electrode 27 on the power application side can be reduced.

In this embodiment, the center O ₂₅ in the longitudinal direction of the arc-shaped discharge portion 25a is connected to the upper suspension point O of the supporting insulator 6.
It is set on the straight line _{L 1} and connecting the lowermost discharge end O _2. Therefore, the power transmission line 11 is moved in the line direction (FIG.
Of when the supporting insulators 6 swings in the horizontal direction) is swung in the same direction around the upper suspension point O _1, because the arc-shaped discharge portion 25a is substantially equally displaced swinging direction, the The length of the arc-shaped discharge portion 25a in the longitudinal direction can be set to a necessary minimum, and the size of the entire discharge electrode 27 can be reduced.

Further, the discharge electrode 20 on the ground side is
It is formed in an arc shape having a convex bottom when viewed from the line direction as shown in, the arc T ₂ are has an arc around the upper suspension point O ₁ of the support insulator 6. Therefore, when the supporting insulator 6 swings in the direction orthogonal to the line (the left-right direction in FIG. 2) together with the power transmission line 11, the air discharge gap G is kept substantially constant.

The present invention is not limited to the above embodiment, but can be embodied as follows. (1) Although the lightning arrester 15 is supported vertically in the above embodiment, it may be inclined or horizontally supported .

[0022]

[0023]

As described in detail above, according to the first aspect of the present invention, the size of the discharge electrode on the power receiving side can be reduced, and the discharge electrode can be aerial.
Shorten the gap length to improve the compatibility with existing lines,
Even when the transmission line swings in the line direction due to wind pressure etc. together with the support insulator, the air discharge gap length is kept within the allowable value,
Discharge characteristics can be stabilized.

[0024] Also, the invention of claim 2, wherein, since the center of the arc of the pair of arcuate discharge portion is set to the vicinity of the bottom discharge end of the line perpendicular to the direction as viewed from the ground side of the discharge electrode, a stationary state In the above, since all of the pair of arc-shaped discharge portions have a predetermined air discharge gap length, the width of change of the air discharge gap length when the supporting insulator swings in the line direction together with the discharge electrode on the power application side. In particular, it is possible to further suppress the expansion width, so that the size of the ring-shaped discharge portion in the longitudinal direction can be reduced as compared with the related art, and the entire discharge electrode can be downsized.

Further, the invention according to claim 3 is characterized in that a pair of lateral
The center in the longitudinal direction of the arc-shaped discharge part of the long ring-shaped discharge part,
Having respectively located straight near connecting the swing center of the lowermost discharge end and the support insulators of the ground side discharge electrode, transmission lines swung into line direction by wind pressure or the like, the discharge supporting insulator is voltage application side When swinging back and forth in the line direction together with the electrodes, the pair of horizontally long arc-shaped discharge portions are displaced almost uniformly in the swinging direction.
The size of the arc-shaped discharge portion in the longitudinal direction can be set to a necessary minimum, and the size of the entire discharge electrode can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a lightning arrester device showing an embodiment embodying the present invention.

FIG. 2 is a side view showing a relationship between a discharge electrode on the lightning arrester insulator and a discharge electrode unit on the power receiving side.

FIG. 3 is a front view showing a conventional discharge electrode on the power application side.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 support arm, 2 suspension bracket, 6 support insulator, 8 lower horn mounting bracket, 11 transmission line, 14 mounting adapter, 15 lightning arrester, 16 resistance element, 20 ground-side discharge electrode, 23 support rod, 25 ring-shaped discharge part , 2
5a arc-shaped discharge portion, 27 discharge electrode on the power application side, G air discharge gap, T ₁ arc, upper suspension point of O ₁ support insulator 6, lowermost discharge end of O ₂ ground-side discharge electrode 20, O ₂₅ The center of the arc discharge part 25a, L straight line.

Claims (3)

(57) [Scope of request for utility model registration] 1. A supporting insulator is suspended from a supporting arm of a tower via an upper suspending bracket so as to be swingable about an upper suspending point, and a lower end of the supporting insulator is suspended via a lower suspending bracket. A lightning arrester is extended and supported in the line direction on the supporting arm side through a mounting adapter, and a discharge electrode on the power application side is attached to the lower suspension metal fitting. In a lightning arrester for a power transmission line supporting a grounding-side discharge electrode opposed to a power-supplying-side discharge electrode with a predetermined air discharge gap on an insulator, a pair of horizontally long rings are provided at the tip of the power-supplying-side discharge electrode. -Shaped discharge parts are provided, and each horizontally elongated ring-shaped discharge part is viewed from the line direction.
It arranged so as to be positioned on the pair of left and right vertical plane, respectively its a pair of discharge portions, wherein facing the ground side discharge electrode of these towards the discharge electrode of the ground side is an arc-shaped discharge portion to be concave A discharge electrode structure on the power application side. 2. The method of claim 1, said arc of the center of both arcuate discharge portion were respectively set to be located near the bottom discharge end of the discharge electrode of the ground side as viewed from the line perpendicular to the direction Discharge electrode structure on the power application side of the lightning arrester insulator for transmission lines. 3. The pair of horizontal members according to claim 1, wherein
The center of the discharge part of the long ring-shaped discharge electrode in the longitudinal direction is
It the lowermost discharge end of the ground side discharge electrode upper suspension point of the support insulator, i.e. a straight line around which connects the swinging center of the support insulator
The discharge electrode structure on the power application side of the lightning arrester for transmission line, which is set respectively.