JP2509598B2 - Lightning arrester device for power lines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention, when an abnormally large current flows through a power transmission line due to lightning, discharges it rapidly to the ground by a lightning protection function and suppresses follow-up current. The present invention relates to a lightning arrester device for a transmission line that can be cut off to prevent a permanent ground fault.

(Prior Art) Conventionally, as a transmission line lightning arrester device, as shown in FIG. 4, a long stem insulator 31 for a transmission line 9 is supported on a support arm 1 of a steel tower, and the long stem insulator 31 of the same is used. The upper electrode fitting 32 supports the lightning protection insulator 34 via the bracket 33, and the lower electrode fitting 35
In addition, an arcing horn 37, which faces the arcing horn 36 attached to the lower end of the lightning protection insulator 34 with a predetermined discharge gap G, is supported.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional transmission line lightning arrester device, since the arcing horns 36 and 37 have their tips opposed to each other, the rainwater that has flowed down along the surface of the lightning arrester 34 is run down. From the tip of the arcing horn 37 through the arcing horn 37
There is a problem that flash power is generated between the arcing horn 37 and the arcing horn 37 due to the force of the rainwater.

Further, when the power transmission line 9 swings due to wind pressure, snow cover, etc., and the long-distance insulator 31 swings around the upper hanging metal member 38, the lightning protection insulator 34 also swings via the bracket 33, so the bracket 33
Due to the deformation, the discharge gap G between the arcing horns 36, 37 changes, the discharge characteristics deteriorate, and the reliability as a lightning arrester device is lacking.

Further, if the bracket 33 is damaged, there is a problem that the repair work is troublesome and the maintenance cost rises.

Further, if the power transmission line 9 breaks, the long-distance insulator 31 with the lightning-insulator 34 mounted thereon vibrates violently. Therefore, the long-distance insulator 31 collides with the support arm 1 and is damaged, or the bracket 33 is damaged and the lightning-prevention lightning strikes. There is a risk that the insulator 34 may fall and the repair work may become difficult.

Configuration of the Invention (Means for Solving Problems) In order to solve the above problems, the present invention provides a support insulator for a support arm of a steel tower so as to be rotatable in the track direction and the same orthogonal direction by an upper suspension metal fitting. The power transmission line is supported on the lower end of the support insulator via the lower suspension metal fittings, while on the other hand, the tip of the support arm is attached to the outer side of the line when the lightning protection insulator is seen from a plane via the mounting adapter. Attach them in different phases,
Displace the arcing horn on the power-supply side attached to the electrode on the power-supply side of the same lightning insulator to the outside of the line when viewed from the same plane,
The arcing horn on the charging side attached to the lower hanging metal fitting is shaped like an arc so that the discharge gaps of both arcing horns are almost the same when the transmission line swings in the direction orthogonal to the line. The arc horn on the grounding side is formed in a slanting shape, and the tip of the arcing horn on the charging side is curved downward.

(Operation) The present invention operates as follows by adopting the above means.

Since rainwater from the tip of the grounding-side arcing horn does not scatter from the tip to the tip of the charging-side arcing horn, no flashover occurs in the discharge gap.

Further, even if the power transmission line swings due to wind pressure, snow cover, or the like, and the supporting insulator swings, the arcing horn on the charging side swings outside the transmission line, and the two grounding side and charging side Since the discharge gap of the arcing horn is kept constant, stable discharge is performed and simplification of the arcing horn,
Can be miniaturized.

Furthermore, since the tip of the arcing horn on the charging side is curved downward, the arc can be blown downward if the follow-up current is not interrupted.
Corona can be prevented.

In addition, even if the supporting insulator is violently rocked due to the breakage of the power transmission line and the supporting insulator collides with the grounding side arcing horn, the arcing horn on the power distribution side can be bent, and the repair work can be performed on the arcing horn on the power distribution side. It is sufficient to correct the deformation of the horn, and the reliability of the lightning arrester insulator device is maintained.

(Embodiment) An embodiment embodying the present invention will be described below with reference to FIGS. 1 to 3.

A connecting fitting 2 is fixed to the tip of a supporting arm 1 of a steel tower, and a suspending insulator 5 is connected to the connecting fitting 2 via a U-clevis link 3 and a horn mounting fitting 4 in series as a supporting insulator. The insulator string 6 is supported so as to be swingable in the track direction and the same direction. In this embodiment, the connecting fitting 2, the U-clevis link 3 and the horn mounting fitting 4 constitute an upper hanging fitting. An electric wire clamp 10 that supports a power transmission line 9 is supported via a connecting link 8 on the horn mounting bracket 7 at the lower end of the suspension insulator string 6. In this embodiment, the horn mounting member 7, the connecting link 8 and the wire clamp 10 form a lower hanging member. The horn mounting brackets 4 and 7 are equipped with arcing horns 11 and 12 for reducing damage to the surface flashover of the suspension insulator string 6 as much as possible.

A mounting adapter 13 is fixed to the tip of the support arm 1 with bolts, and a plate-like mounting portion 13a fixed vertically to the tip of the adapter 13 has a lightning protection insulator 14 with an electrode fitting 15 on the ground side. It is supported in a cantilever manner by bolts in the direction of the line and as shown in FIG. Further, a grounding side arcing horn 17 is supported by an electrode metal fitting 16 provided on the tip end of the lightning protection insulator 14 on the voltage application side. Same arcing horn 17
The tip portion 17a is formed in an inverted T shape, and is arranged so as to correspond to the tip portion 18a of the arcing horn 18 on the side of charging, which will be described later. Further, the upper end portion 17b of the tip portion 17a is formed substantially horizontally.

On the other hand, as shown in FIG. 1, the horn mounting bracket 7 has an arcing horn 18 on the power-supply side supported in a cantilever manner by bolts substantially in the line direction, and between the arcing horn 18 and the grounding-side arcing horn 17. Is provided with a predetermined air discharge gap G.

As shown in FIG. 2, the arcing horn 18 on the charging side is formed in a generally L-shape as a whole, and is formed in an arc shape around the hanging point at the upper portion of the supporting insulator string 6. The tip portion 18a of the arcing horn 18 is curved and formed obliquely downward. The tip of the arcing horn 18 is located above the lower surface of the suspension insulator string 6.

Even if the suspension insulator 6 swings in the direction orthogonal to the line in FIG. 2 (the left-right direction in FIG. 2), the discharge gap G is kept substantially constant.

The lightning protection insulator 14 has a voltage-current characteristic mainly composed of a pressure-resistant insulating cylinder (not shown) formed in a cylindrical shape by a tension-resistant material such as FRP and zinc oxide (ZnO) housed in the inside thereof in series. A non-linear lightning arrester (not shown), cap-shaped electrode-side and ground-side electrode fittings 16 and 15 fitted and fixed to both ends of the pressure-proof insulating cylinder, and further provided on the outer periphery of the pressure-proof insulating cylinder. And a rubber mold 19.

In addition, the mounting portion 13a of the mounting adapter 13 and the lightning protection insulator 1
Arcing rings 20 and 21 are provided on the electrode fitting 16 on the side of the voltage application 4 to reduce the damage of the rubber mold 19 at the time of a surface flashover.

Next, the operation of the transmission line lightning arrester device configured as described above will be described.

Now, when an abnormally large current exceeding the assumption is applied to the transmission line 9 due to a large-scale lightning stroke, this current is discharged from the wire clamp 10 and the arcing horn 18 on the charging side to the arcing horn 17 on the ground side through the discharge gap G. Then, it flows from the electrode side metal fitting 16 to the lightning protection element (not shown) of the lightning protection insulator 14, flows to the support arm 1 via the ground side electrode metal piece 15 and the mounting adapter 13, and further flows to the steel tower to be discharged to the ground. The subsequent flow generated thereafter is suppressed and blocked by the lightning protection element.

Now, in the above embodiment, even if the suspension insulator string 6 swings due to the load of wind pressure or snow on the power transmission line 9 from the stationary state of the insulator device shown in FIG. Since the arc gaps G of the arcing horns 17 and 18 are formed to be maintained substantially constant, the discharge characteristics can be stabilized and the reliability can be improved.

The tip 17a of the grounding side arcing horn 17 has an inverted T-shape.
Since it is formed in a letter shape, rainwater is smoothly dropped down, and the momentum 18
In addition to being scattered to a, it does not hit the suspension insulator string 6.

Further, since the tip end portion 18a of the arcing horn 18 on the voltage applying side is formed to be curved obliquely downward, the arc blowdown is directed downward and the corona can be prevented even in an abnormal situation where the follow current interruption is not performed. . The same effect is exerted also on the upper end portion 17b of the tip end portion 17a of the arcing horn 17 on the ground side.

The lightning protection insulator device of the present embodiment as described above is provided with a lightning protection insulator 14
Also, the arcing horn 18 on the power supply side can be easily applied to the existing equipment only by disposing the arcing horn 18 outside the line. Furthermore, the arcing horns 17 and 18 on the grounding side and the charging side have a simple structure, and the lightning protection insulator device can be miniaturized.

By the way, since the suspension insulator series 6 swings independently of the lightning arrestor 14, an unreasonable external force does not act on the mounting adapter 13, so that the deformation of the adapter 13 and the damage of the lightning insulator 14 can be prevented. .

Further, even if the power transmission line 9 breaks and the suspension insulator string 6 tilts largely around the upper suspension point, and the suspension insulator member 6 collides with the grounding-side arcing horn 17, the suspension insulator member 6 can be deformed. Only the arcing horn 17 is bent, the suspension insulator series 6 is not damaged, and the suspension insulator 6 is not damaged due to the collision of the lightning protection insulator 14 and the suspension insulator series 6, and the reliability as the lightning protection insulator device is improved. Can be improved. Further, since the work of repairing the arcing horn 17 on the ground side becomes easy, the repair cost can be reduced.

The present invention is not limited to the above embodiment, but can be configured as follows. In these cases as well, the same actions and effects as those of the above embodiment can be obtained.

(1) Although the arcing horn 17 has the tip portion 17a formed in an inverted T shape in the above embodiment, it may be formed in an L shape.

(2) The mounting position of the mounting adapter 13 is on the outside of the connecting fitting 2 in the above-described embodiment.
It can also be inside.

(3) Although the lightning protection insulator 14 is formed in the horizontal direction from the adapter 13 in the above-mentioned embodiment, it may be formed in the vertical direction from the adapter 13.

Advantageous Effects of Invention The lightning conductor insulator for a power transmission line of the present invention does not cause flashover by rainwater between the tip of the grounding-side arcing horn and the tip of the charging-side arcing horn, and always has stable discharge characteristics. In addition, the arcing horn can be simplified and downsized, and even in the event of an upper current interruption, there is almost no effect on the lightning arrester device itself, and the reliability as a lightning arrester device is maintained. It has an excellent effect that it can be easily applied to existing equipment.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a right side view of FIG. 1, FIG. 3 is a plan view of FIG. 1, and FIG. 4 is a front view showing a conventional example. It is a figure. 1 ... Support arm, 6 ... Suspension insulator string as a support insulator, 9 ... Transmission line, 13 ... Mounting adapter, 13a ... Mounting part, 14 ... Lightning arrester, 17 ... Grounding side arcing horn, 17a: tip, 18: arcing horn on charging side, 18a: tip, G: discharge gap.

Claims (2)

(57) [Claims] 1. A support insulator is suspended from a support arm of a steel tower by an upper suspension metal fitting so as to be rotatable in the track direction and the orthogonal direction, and a lower suspension metal fitting is interposed at a lower end portion of the support insulator. While supporting the power transmission line, the lightning protection insulator is attached to the tip of the support arm via the mounting adapter so that the lightning protection insulator is out of phase when viewed from the plane, and the lightning side electrode of the lightning protection insulator is attached. Similarly, the arcing horn on the power-supply side attached to the above is displaced outward from the line when viewed from the same plane, and the arcing horn on the power-supply side attached to the lower hanging fitting is swung in the direction orthogonal to the line of the transmission line. Sometimes the arcing horns of both arcing horns are formed in a substantially arc shape when viewed from the line direction so that the discharge gaps of both arcing horns are substantially the same, and the tip of the grounding side arcing horn is formed in a slanted shape. The tip of the is curved downward. For power transmission lines and lightning arrester insulator apparatus. 2. The lightning arrester device for a power transmission line according to claim 1, wherein the arcing horn on the ground side has an inverted T-shape or L-shape at the tip thereof.