JP2941973B2 - Lightning arrester for V-suspension device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightning arrester for a V-suspension device.

[0002]

2. Description of the Related Art As a conventional lightning arrester for a V-suspension device,
There is one disclosed in JP-A-62-168305. This lightning arrester connects a pair of left and right long trunk insulators to the support arm of a tower in a V-shape, and supports a transmission line via a connection link and a wire clamp to a connection yoke connecting the lower ends of both long trunk insulators. The cantilever support of the discharge electrode on the power application side in the direction perpendicular to the line direction with respect to the connection yoke, while suspending and fixing the lightning arrester body to the tip of the support arm via a mounting adapter, At the lower end of the lightning protection device main body, a ground-side discharge electrode opposed to the power-supply-side discharge electrode with a predetermined air discharge gap was supported.

[0003]

Since the above conventional lightning arrester has a pair of long-stem insulators mounted in a V-shape, even if the transmission line swings due to wind pressure or the like, the long-stem insulators are not moved in the line direction. Although it swings, it does not swing in the direction orthogonal to the line, and the air discharge gap between the two discharge electrodes does not change significantly.
Therefore, a pillar state with stable discharge characteristics is maintained.

However, if a suspension insulator in which a number of suspension insulators are connected in series is used instead of the long trunk insulator, if the transmission line swings in a direction perpendicular to the line due to wind pressure or the like, the suspension insulator will also move in the same direction. Due to the swing, the gap between the discharge electrode on the power application side and the discharge electrode on the ground side changes, so that there is a problem that adaptation cannot be performed. SUMMARY OF THE INVENTION It is an object of the present invention to provide a V-suspension device capable of maintaining a substantially constant air discharge gap between both the power application side and the ground side discharge electrodes even when the V-suspension insulator device swings in the line direction and the line orthogonal direction. An object of the present invention is to provide a lightning arrester for an insulator device.

[0005]

According to the present invention, in order to achieve the above object, the upper ends of a pair of suspension insulators are connected to a support arm via a ground-side suspension fitting, respectively. A power-supply-side hanging bracket is connected between the lower ends, and a connecting yoke is used between the two power-supplying-side hanging brackets in the line direction and the line orthogonal direction so that the two suspension insulators are substantially V-shaped. The connecting yoke supports a transmission line via a wire clamp, and the support arm is mounted with a lightning arrester main body via a mounting adapter. On one of the hanging brackets, an arc-shaped discharge electrode on the power application side extends in substantially the same direction as the line direction, and the arc-shaped discharge portion of the discharge electrode extends downward along the oblique suspension insulator axis. The lightning arrester main body. A rod-shaped discharge electrode facing the discharge electrode on the power application side with a predetermined air discharge gap is disposed so as to be substantially orthogonal to a plane passing through the arc-shaped discharge part and near the center of the arc of the arc-shaped discharge part. We take means to do.

[0006]

According to the present invention, when the transmission line swings in the line direction due to wind pressure or the like, the tip of the arc-shaped discharge portion of the discharge electrode on the power receiving side has an arc centered on the upper suspension point of the suspension of the suspension. Oscillating along the trajectory, the air discharge gap between the tip of the arc-shaped discharge portion and the discharge electrode on the ground side is kept substantially constant.
Also, when the transmission line swings in the direction perpendicular to the line due to wind pressure, etc., the discharge electrode on the power application side and the suspension metal fitting on the power application side follow an arc trajectory centered on the upper suspension point of one suspension insulator series. Therefore, the discharge gap between the discharge electrode and the ground-side discharge electrode provided substantially parallel to the arc trajectory in opposition thereto is maintained substantially constant.

[0007]

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, a pair of right and left mounting brackets 2 and 2 are fixed to the support arm 1 of the tower by bolts, and a plurality of suspension brackets are mounted on the mounting brackets 2 and 2 via ground-side hanging brackets 3 and 3, respectively. Suspended insulator trains 4 and 4 formed by connecting insulators in series are connected, and a connecting yoke 6 is connected to connecting pins 9 at lower ends of both suspended insulator trains 4 and 4 via suspending metal fittings 5 and 5. The pair of left and right suspension insulators 4, 4 are connected in a substantially V-shape. A transmission line L is supported at the center of the connection yoke 6 via a connection link 7 and a wire clamp 8.

A discharge electrode 10 on the power supply side is supported on the one (left side in FIG. 1) power supply side hanging bracket 5. The discharge electrode 10 is fixedly penetrated to the power-supply-side hanging bracket 5 and extends in the line direction.
And an arc-shaped discharge portion 10b also extending in the line direction. The arc-shaped discharge portion 10b is located in an imaginary plane passing through the center axis O of the left suspension insulator string 4 and extending in the line direction, and is formed in an arc shape that is obliquely downwardly convex.

In addition, arc horns 11 and 12 for protecting the suspension insulator string 4 are supported on the ground-side hanging metal fitting 3 and the power-receiving-side hanging metal fitting 5, respectively. The discharge electrode 10 on the power application side also serves as the arc horn 12 on the left side in FIG. A mounting adapter 13 is supported at the distal end of the support arm 1 in the line direction as shown in FIGS. 2 and 3, and a grounding side provided at the upper end of the lightning arrester main body 14 is provided at the lower end of the mounting adapter 13. Are fixed by bolts. This lightning arrester body 14 is FRP
A pressure-resistant insulating cylinder (not shown) formed into a cylindrical shape by, for example,
A current limiting element 17 containing zinc oxide as a main component, which is housed inside the pressure-resistant insulating cylinder and has a non-linear voltage-current characteristic, and a ground-side and power-receiving side fitted and fixed to the upper end of the pressure-resistant insulating cylinder. It is composed of electrode fittings 15, 16 and an insulating jacket 18 rubber-molded outside the pressure-resistant insulating cylinder.

The power-supply-side electrode fitting 16 supports a ground-side discharge electrode 19 that faces the power-supply-side discharge electrode 10 with a predetermined air discharge gap G. As shown in FIG. 1, the discharge electrode 19 passes through a base end portion 19a supported by the power-supplying-side electrode bracket 16 of the lightning arrester main body 14 and a central axis O of the left suspension string 4, and in the line direction. It is formed by a rod-shaped discharge portion 19b which is supported in an inclined state so as to be perpendicular to the above-mentioned virtual plane which is directed. Further, as shown in FIG. 3, the rod-shaped discharge portion 19b is located near the center of the arc of the arc-shaped discharge portion 10b on the power application side, and an air gap with the tip of the arc-shaped discharge portion 10b is defined as a discharge gap G. I have.

Reference numerals 20 and 21 denote arc rings for protecting the lightning arrester main body 14. Next, the operation of the lightning arrester for the V suspension insulator device configured as described above will be described. Now, when a lightning surge current due to lightning strikes on the transmission line L, the current is generated by the electric wire clamp 8, the connection link 7, the connection yoke 6, and the arc-shaped discharge portion 10 of the discharge electrode 10 on the power receiving side.
b through the discharge gap G from the tip of the discharge electrode 1 on the ground side.
9 and is discharged to the tower via the electrode fitting 16, the current limiting element 17, the electrode fitting 15, the mounting adapter 13 and the support arm 1. Further, the subsequent current that is going to flow thereafter is suppressed and cut off by the restoration of the resistance value of the current limiting element 17 and the air discharge gap G, thereby preventing a ground fault accident.

In the embodiment of the present invention, the arc-shaped discharge portion 10b of the discharge electrode 10 on the power receiving side is shown in FIGS.
As shown in the figure, it is located in an imaginary plane extending in the direction of the line and passing through the center axis O of the suspension 4 on the left side.
On the other hand, the ground-side discharge electrode 19 is arranged perpendicularly to the virtual plane and near the center of the arc of the discharge portion 10b as shown in FIG. 3, so that the transmission line L swings in the line direction. When the suspension insulator string 4 swings in the left-right (line) direction in FIG. 3 around the ground-side hanging bracket 3, even if the discharge electrode 10 on the power receiving side is displaced as shown by a chain line in FIG. The air discharge gap G between the two discharge electrodes 10 and 19 is kept constant.

When the power transmission line 9 swings in the direction perpendicular to the line as shown in FIG. 4, the discharge electrode 10 on the power receiving side and the hanging metal fitting 5 on the power receiving side are connected to the suspension 4 on the left side. Although it swings as shown by a substantially arc-shaped locus T centered on the upper hanging point P, a discharge gap G between the tip of the arc-shaped discharge portion 10b of the discharge electrode 10 and the rod-shaped discharge electrode 19 on the ground side is formed. It is kept almost constant. As a result, even if the transmission line L swings, the discharge characteristics of the lightning arrester main body 14 are stabilized.

The present invention can be embodied as follows. In the above-described embodiment, the lightning arrester main body 14 is disposed at the center of both the suspension insulators 4 and 4, but this position may be disposed near the tip of the support arm 1 or the lightning arrester main body 14 may be horizontally supported. You can also. Further, by forming the rod-shaped discharge portion 19b in an arc shape parallel to the arc locus T in FIG. 4, the air discharge gap G can be kept constant.

[0015]

As described above in detail, according to the present invention, even if the transmission line swings in the line direction or the line orthogonal direction, the air discharge gap between the discharge electrode on the power application side and the discharge electrode on the ground side is formed. There is an effect that the discharge characteristics of the lightning arrester can be stabilized while being kept constant.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment embodying the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a left side view of FIG.

FIG. 4 is an explanatory diagram showing a positional relationship of a discharge electrode when a transmission line swings in a direction orthogonal to a line.

[Explanation of symbols]

1 support arm, 2 mounting brackets, 3 ground side hanging brackets,
4 suspension insulator series, 5 section power side hanging bracket, 6 connecting yoke,
10 Discharge electrode on power application side, 10b Arc-shaped discharge part, 13
Mounting adapter, 14 lightning arrester main body, 19 ground-side discharge electrode, 19b rod-shaped discharge part, G air discharge gap, L
power line.

Claims (1)

(57) [Claims] An upper end of a pair of suspension insulators is connected to a support arm via a ground-side suspension bracket, and a power-supply-side suspension bracket is connected between lower ends of both suspension insulators. A connecting yoke is connected between the two power-supply-side hanging brackets so as to be swingable in a line direction and a line orthogonal direction by a connecting yoke so that the two suspension insulators are substantially V-shaped. A power transmission line is supported via a clamp, a lightning arrester main body is mounted on the support arm via a mounting adapter, and one of the two power-supply-side suspension brackets has an arc-shaped power supply. The discharge electrode on the side extends in substantially the same direction as the line direction, and the arc-shaped discharge portion of the discharge electrode is arranged in a downwardly convex shape along the oblique suspension insulator continuous axis. With a predetermined air discharge gap from the discharge electrode on the power application side to the tip A lightning arrester for a V-suspension insulator device, wherein opposing rod-shaped discharge electrodes are disposed so as to be substantially perpendicular to a plane passing through the arc-shaped discharge part and near the center of the arc of the arc-shaped discharge part.