JPS63190220A - Lightning insulator for transmission line - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Purpose of the Invention (Industrial Field of Application) The present invention provides a method for detecting abnormally large currents flowing through power transmission lines due to lightning strikes.
The present invention relates to a lightning insulator device for power transmission lines that can quickly discharge lightning to the ground through its protection function, suppress and interrupt follow-on current, and prevent permanent ground faults.

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

(Problems to be Solved by the Invention) However, in the conventional lightning arrester device for power transmission lines, since the tips of the arcing horns 36 and 37 face each other, rainwater flowing down the surface of the lightning arrester 34 is However, the rainwater runs down the arching horn 36 and hangs from its tip to the arching horn 37, and the force of the rainwater causes the arching horn 3 to fall.
There is a problem that flashbacks occur between 7 and 7.

In addition, when the power transmission ¥tIA9 swings due to wind pressure, snow cover, etc., and the long insulator 31 swings around the upper hanging metal fitting 38,
Since the lightning arrester 34 also swings via the bracket 33,
Due to the deformation of the bracket 33, the arcing horns 36, 3
There is a problem in that the discharge gap G between 7 changes, the discharge characteristics deteriorate, and the reliability as a lightning arrester device is lacking.

Furthermore, if the bracket 33 is damaged, repair work is troublesome and maintenance costs rise.

Furthermore, if the power transmission line 9 were to break, the long insulator 31 to which the lightning arrester 34 is attached would swing violently, causing the long insulator 31 to collide with the support arm 1 and be damaged, or the bracket 33 to be broken. There is a risk that the lightning arrester 34 may fall or that repair work may become difficult.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a support insulator that can be rotated in the direction of the railway line and in the orthogonal direction by means of an upper hanging bracket with respect to the support arm of the steel tower. The lower end of the support insulator supports the power transmission line via a lower hanging bracket, while the end of the support arm supports the lightning arrester through a mounting adapter to the outside of the line when viewed from above. The arcing horns on the energizing side, which are attached to the energizing side electrode of the lightning arrester with different phases, are also displaced outward from the line when viewed from the plane, and attached to the lower hanging bracket. The arcing horn on the energized side is formed into a substantially arc shape when viewed from the line direction so that the discharge gap between both arcing horns is almost the same when the power transmission line swings in the direction perpendicular to the line, and the arcing horn on the grounding side The tip of the arcing horn is formed obliquely, and the tip of the arcing horn on the power supply side is curved downward.

(Function) By employing the above means, the present invention functions as follows.

Since rainwater from the tip of the arcing horn on the ground side does not scatter from the tip toward the tip of the arcing horn on the power supply side, no flash fault occurs in the discharge gap.

In addition, even if the power transmission line sways due to wind pressure, snow cover, etc. and the supporting insulator oscillates, the arcing horn on the power supply side will sway outside the power transmission line, and the two grounding and power supply side Since the discharge gap of the arcing horn is kept constant, stable discharge is performed and the arcing horn can be simplified and miniaturized.

Furthermore, since the tip of the arcing horn on the energized side is curved downward, the arc can be directed downward in the event that the follow-on current is not interrupted, and it also prevents corona. be able to.

In addition, even if the power transmission line breaks and the supporting insulator shakes violently, and the supporting insulator collides with the arcing horn on the grounding side, the arcing horn on the power-supplying side will only bend, and repair work can also be done with the arcing horn on the power-supplying side. All that is needed is to correct the deformation of the horn, and the reliability of the lightning arrester device can be maintained.

(Example) Hereinafter, an example embodying the present invention will be described based on FIGS. 1 to 3.

A connecting fitting 2 is fixed to the tip of the support arm 1 of the steel tower, and a suspension insulator 5 is connected in series to the connecting fitting 2 via a U clevis link 3 and a horn fitting 4. The insulator chain 6 is supported so as to be swingable in the line direction and in the orthogonal direction. In this embodiment, the connecting fitting 2, the U clevis link 3, and the horn mounting fitting 4 constitute an upper hanging fitting. A wire clamp 10 for supporting a power transmission line 9 is supported by a horn fitting 7 at the lower end of the suspension insulator chain 6 via a connecting link 8. In this embodiment, the horn mounting fitting 7, the connecting link 8 and the wire clamp 10 constitute a lower hanging fitting. The horn mounting brackets 4 and 7 are provided with an arcing horn 11. to reduce damage caused by creeping flash to the suspension insulator chain 6 as much as possible.
12 is installed.

A mounting adapter 13 is fixed to the tip of the support arm 1 with a bolt, and a lightning arrester 14 is attached to a plate-shaped mounting portion 13a vertically fixed to the tip of the adapter 13 with an electrode fitting 15 on the ground side. It is cantilevered by bolts in the direction of the line and with a different phase outward from the line when viewed from above as shown in FIG. Further, an arcing horn 17 on the grounding side is supported by an electrode fitting 16 on the charging side provided at the tip of the lightning arrester 14 .

The tip portion 17a of the arcing horn 17 is formed in an inverted T shape, and the tip portion 1 of the arcing horn 18 on the energizing side, which will be described later.
It is arranged so as to correspond to 8a. Further, the upper end portion 17b of the tip portion 17a is formed substantially horizontally.

On the other hand, as shown in FIG. 1, on the horn mounting bracket 7, an arcing horn 18 on the energized side is supported by a bolt in a cantilever manner approximately in the line direction, and the arcing horn 18' and the arcing horn 17 on the grounding side are supported by a bolt. A predetermined air discharge gap G is provided between them.

Further, as shown in FIG. 2, the arcing horn 18 on the energizing side is formed in a generally horizontal shape as a whole, and is formed in an arc shape centered on the upper hanging point of the support insulator chain 6. The tip 18a of the arcing horn 18 is curved diagonally downward. The tip of the arcing horn 18 is located above the lower surface of the suspended insulator chain 6.

The suspension insulator chain 6 is shown in the direction perpendicular to the track (the second
The discharge gap G is maintained substantially constant even if the discharge gap G is oscillated in the horizontal direction (in the left-right direction in the figure).

The lightning arrester 14 includes a voltage-resistant insulating cylinder (as shown) formed in a cylindrical shape from a tensile material such as FRP, and a voltage-current characteristic mainly made of zinc oxide (ZnO) housed in series inside the cylinder. A non-linear lightning arrester (as shown), cap-shaped electrode fittings 16 and 15 on the power supply side and the grounding side that are fitted and fixed to both ends of the voltage-resistant insulation cylinder, and further provided on the outer periphery of the voltage-resistant insulation cylinder. It is formed by a rubber mold 19.

The mounting portion 13a of the mounting adapter 13 and the electrode fitting 16 of the lightning arrester 14 are provided with an arcing ring 2 to reduce damage to the rubber mold 19 during creeping flash.
0.21 is provided.

Next, the operation of the lightning arrester device for power transmission lines constructed as described above will be explained.

Now, when an abnormally large current exceeding expectations is applied to the power transmission line 9 due to a large-scale lightning strike, this current is discharged from the wire clamp 10 and the arcing horn 18 on the energized side to the arcing horn 17 on the grounding side through the discharge gap G. and the charging side electrode fitting 1
6 to the lightning arrester element of the lightning insulator 14 (as shown), and passes through the ground side electrode fitting 15 and the mounting adapter 13 to the support arm 1.
It then flows to the steel tower and is discharged to the ground. Subsequent currents that occur thereafter are suppressed and blocked by the lightning arrester.

Now, in the above embodiment, when the insulator device is in a stationary state shown in FIG. 1, a load due to wind pressure, snow cover, etc. acts on the power transmission line 9.
Even if the suspension insulator chain 6 swings, the discharge gap G of the arcing horns 17.1B on the grounding side and the energizing side is formed to be kept almost constant, so the discharge characteristics are stabilized and reliability is improved. can be improved.

Since the tip 17a of the arcing horn 17 on the grounding side is formed in an inverted T shape, rainwater can fall smoothly and its momentum can scatter onto the tip 18a of the arcing horn 18 on the power supply side. Not only that, but you won't have to do 6 pull-ups.

In addition, since the tip 18a of the arcing horn 18 on the energizing side is curved diagonally downward, the arc blows out downward even in abnormal situations where follow-on current interruption is not performed, and corona prevention is achieved. . The same effect is achieved for the upper end portion 17b of the tip portion 17a of the arching horn 17 on the grounding side.

The lightning arrester device of this embodiment as described above has the lightning arrester 14
It can be easily applied to existing equipment by simply arranging the arcing horn 18 on the power supply side outside the line. Furthermore, arcing horns 17 and 18 on the grounding side and the charging side
has a simple structure, and the lightning arrester device can be miniaturized.

Incidentally, since the suspension insulator chain 6 swings independently of the lightning arrester 14, no excessive external force is applied to the mounting adapter 13, and therefore deformation of the adapter 13 and damage to the lightning arrester 14 can be prevented. .

In addition, even if the power transmission line 9 were to break and the suspension insulator chain 6 tilted significantly around the upper hanging point, and the suspension insulator chain 6 collided with the arcing horn 17 on the ground side, the deformable The arcing horn 17 is only bent, and the suspension insulator chain 6 is not damaged.Furthermore, the suspension insulator 6 is not damaged due to collision between the lightning arrester 14 and the suspension insulator chain 6, and is reliable as a lightning arrester device. can improve sexual performance. Furthermore, repair work on the grounding side arcing horn 17 becomes easier.
Repair costs can also be reduced.

Note that the present invention is not limited to the above embodiments,
It can be configured as follows. In these cases as well, the same actions and effects as in the above embodiments can be achieved.

(1) Although the tip portion 17a of the arcing horn 17 is formed into an inverted T-shape in the above embodiment, it can also be formed into an L-shape.

(2) Although the mounting adapter 13 is mounted outside the connecting fitting 2 in the above embodiment, it can also be mounted inside the connecting fitting 2.

(3) Although the lightning arrester 14 was formed horizontally from the adapter 13 in the above embodiment, it can also be formed vertically from the adapter 13.

Effects of the Invention The lightning arrester device for power transmission lines of the present invention has always stable discharge characteristics without flashing due to rainwater between the tip of the arcing horn on the ground side and the tip of the arcing horn on the energized side. In addition, the arcing horn can be simplified and miniaturized, and even in the event of an abnormality in follow-up current interruption, there is almost no effect on the lightning arrester itself, maintaining its reliability as a lightning arrester. It has excellent effects in that it can be easily applied to existing equipment.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment embodying 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 diagram. ■...Support arm, 6...Suspension insulator chain as support insulator, 9...Power transmission line, 13...Mounting adapter, 13
a... Mounting part, 14... Lightning arrester, 17... Earthing side arcing horn, 17a... Tip part, 18...
・Arching horn on power supply side, 18a... tip, G
...discharge gap.

Claims (1)

[Scope of Claims] 1. A support insulator is suspended from the support arm of the tower by an upper hanging bracket so as to be rotatable in the direction of the railway line and in the orthogonal direction, and a lower hanging bracket is attached to the lower end of the support insulator. On the other hand, a lightning arrester is attached to the tip of the support arm via a mounting adapter so that the phase is different from the line to the outside when viewed from the top, and the lightning arrester is Displace the arcing horn on the power side attached to the power side electrode to the outside of the line when viewed from the same plane, and move the arcing horn on the power side attached to the lower hanging bracket in the direction orthogonal to the line of the power transmission line. The arcing horns are formed in a substantially arc shape when viewed from the line direction so that the discharge gap between the two arcing horns is almost the same when the arcing horn is oscillated, and the tip of the grounding side arcing horn is formed obliquely. A lightning arrester device for a power transmission line, characterized in that the tip of an arcing horn is curved downward. 2. The lightning arrester device for a power transmission line according to claim 1, wherein the ground side arcing horn has an inverted T-shape or an L-shape at its tip.