JPH01220315A - Lighting protection insulator set - Google Patents

Abstract

PURPOSE:To make a discharge interval always retainable constantly even if a strain insulator swingingly moves by forming discharge electrodes of charge and discharge sides so that both electrodes are made to a circular state even a strain insulator swingingly moves in the vertical or right and left direction with the insulator's base end attached point as the center. CONSTITUTION:The discharge electrode 17 at the charge side is extended in the lateral direction, and when the discharge electrode is swingingly moved in the horizontal direction with the attached point of a strain insulator as the center in the plane state, the discharge electrode is formed in a circular state, on the other hand, formed in a circular state concentrically with the locus in which the strain insulator is swingingly moves in the vertical direction with the attached point to a steel tower as the center. This enables the discharge gap G of both discharge electrodes 17 and 26 to always retainable constantly even a suspended insulator string 7 swingingly moves in the vertical or right and left direction with its attached point as the center. Consequently a lightning protection characteristic can be stabilized since discharging and the disconnection of a dynamic current can be surely conducted in the discharge gap G having an unvariable space when a lightning surge enters a transmission line.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention quickly discharges high voltage caused by lightning surge to the ground when it is applied to a power transmission line, and uses a current limiting element to prevent the following current from occurring. This invention relates to a lightning arrester device that prevents ground faults from occurring.

More specifically, the present invention relates to a lightning arrester device capable of stabilizing lightning protection characteristics by always maintaining a constant discharge gap between a discharge electrode on the power transmission line side and a discharge electrode on the lightning arrester side.

(Prior art) Conventionally, a power transmission line is installed and supported on the support arm of a tower body via a tension insulator, and a horn-shaped discharge electrode on the power side is installed at the end of the tension insulator on the power side. On the other hand, a lightning arrester is attached to the support arm via a mounting adapter, and the tip of the lightning arrester has a horn-shaped ground side that faces the discharge electrode with an air discharge gap. Lightning arrester devices for power transmission lines equipped with discharge electrodes have been proposed.

(Problems to be Solved by the Invention) In the above-mentioned conventional lightning arrester device for transmission 1ilt'a, when the tension insulator swings vertically or horizontally, the discharge gap changes, so the lightning protection characteristics deteriorate. There was a problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a tension insulator device for a power transmission line that can solve the above problems and maintain a constant discharge gap even if the tension insulator swings.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention erects and supports a power transmission line through a tension insulator on a support arm of a tower body, and also A discharge electrode on the energized side is supported in a cantilever manner on the support arm, and a lightning arrester is attached to the support arm via a mounting adapter, and the tip of the lightning arrester is provided with an air discharge gap between the discharge electrode and the support arm. In a lightning arrester device for a power transmission line equipped with a discharge electrode on the opposing ground side, the discharge electrode on the energized side is extended laterally, and in a flat state, the discharge electrode is centered on the tower side attachment point of the tension insulator. When the discharge electrode is oscillated in the horizontal direction, the discharge gap is formed in an arc shape so that the discharge gap remains constant. The structure is such that it is formed in an arc shape that is concentric with the locus that swings in the vertical direction.

(Function) By adopting the above configuration, even if the tension insulator swings vertically or horizontally around its base end attachment point, both the discharge electrode on the energized side and the discharge electrode on the ground side are shaped like an arc. Since the discharge gap is always kept constant. As a result, lightning protection characteristics become stable.

(Example) Hereinafter, an example embodying the present invention will be described based on the drawings.

Reference numeral 1 in FIG. 1.3 is a support arm mounted horizontally on the main body of the steel tower (the path shown), and a mounting bracket 2 is fixed to the tip of the support arm with a bolt. A U clevis 4 is horizontally rotatably connected to the mounting bracket 2 by a connecting pin 3, and a horn mounting bracket 6 equipped with an arc horn 5 on the grounding side is connected to the U clevis 4. One end of a suspension insulator chain 7, which is a tension insulator made by connecting a large number of suspension insulators in series, is connected to the metal fitting 6, and the end of the suspension insulator chain 7 on the energizing side is energized via a socket clevis 8. A horn mounting bracket 10 with a side arc horn 9 is connected. Further, a power transmission line 12 is attached to the horn mounting bracket 10 via an electric wire clamp 11. Further, a jumper wire 1 is attached to both wire clamps 11 as shown in FIG.
3 is attached.

A mounting bracket 14 is fixed to the horn mounting bracket 10 on the energizing side with bolts 15, and a connector 16 is welded to both upper and lower ends of the mounting bracket 14. Both ends of a hairpin-shaped discharge electrode 17 on the power supply side are fixed by welding. When this discharge electrode 17 is rotated in the horizontal direction about the base end attachment point (connection pin 3) of the suspended insulator chain 7 in a flat state as shown in FIG. It is formed into an arc shape so that a predetermined discharge gap G can always be secured.

The discharge electrode 17 is attached to the horn mounting bracket 10 on the power supply side.
A balance weight 18 that balances the weight of is attached.

On the other hand, a mounting adapter 19 that rises upward and has a horizontally curved upper portion is fixed to the intermediate portion of the support arm 1 with a bolt, and a lightning arrester 20 is suspended from the lower surface of the tip of the mounting adapter 19. This lightning insulator 20 is FR
A voltage-resistant insulating cylinder (shown as shown) made of P, etc., with many pressure relief holes formed therein, and a current-limiting element (shown as shown) mainly made of zinc oxide with non-linear voltage-current characteristics housed inside the cylinder. It is composed of electrodes 21 and 22 on the grounding side and the power supply side that are fitted and fixed to both the upper and lower ends of the voltage-resistant insulating cylinder, and a rubber mold 23 that covers the outer periphery of the voltage-resistant insulating cylinder. The lightning arrester 20 is suspended and fixed by fixing the upper end electrode fitting 21 to the mounting adapter 19 with bolts.

Incidentally, arcing rings (shown in the figure) are attached to the electrode fittings 21 and 22 of the lightning arrester 20, respectively, to prevent creeping flash of the rubber mold 23.

Electrode fitting 2 on the charging side located at the lower end of the lightning arrester 20
2 is integrally formed with a mounting bracket 24, and the mounting bracket 24
The plate-shaped bracket 25 is horizontally moved by bolts,
As shown in FIG. 1, the bracket 25 is supported in a cantilever parallel to the line direction (left-right direction in the figure), and a loop-shaped ground-side discharge electrode 26 is attached vertically to the tip of the bracket 25. ing. As shown in FIG. 2, this discharge electrode 26 is
It is formed in an arcuate shape concentric with the vertical rotation locus T centered on the attachment point (U clevis 4) of the suspension insulator chain 7. A predetermined aerial discharge gap G is formed between the discharge electrode 17 on the energized side and the discharge electrode 26 on the ground side.

The operation of the lightning arrester device configured as described above will be explained.

When a lightning surge is applied to the power transmission line 12, the surge current flows through the wire clamp 11, the horn mounting bracket 10, the mounting bracket 14,
The connection tool 16 and the discharge electrode 17 on the energized side are transferred to the discharge electrode 26 on the ground side, and the discharge electrode 26 on the ground side
to the bracket 25, the mounting fitting 24, and the power-supplying side electrode fitting 22 of the lightning arrester 20. This surge current further flows from the electrode fitting 22 through the current limiting element (path shown) to the electrode fitting 21, passes through the mounting adapter 19 and the support arm 1, reaches the tower main body, and is grounded.

Subsequent currents that occur thereafter are blocked by the air discharge gap G and the current limiting element (path shown) in the lightning arrester 20.

Now, in the embodiment of the present invention, the discharge electrode 17 on the energized side is formed in an arc shape as shown in FIG. 1, and the discharge electrode 26 on the ground side is formed in an arc shape as shown in FIG.
Even if the suspended insulator chain 7 swings vertically or horizontally about its attachment point, the discharge gap G between the discharge electrodes 17, 26 can always be kept constant. Therefore, when a lightning surge enters the transmission line, the discharge gap G whose spacing remains unchanged
It is possible to reliably perform discharge between the two, and also to reliably interrupt the following current, thereby making it possible to stabilize the lightning protection characteristics.

Note that the present invention can be embodied as follows.

(1) In the embodiment described above, the mounting adapter 19 was attached to the middle of the support arm 1, but by extending the attachment adapter 19 outward from the tip of the support arm l, both discharge electrodes 17
．． 26 to face the outside of the suspension insulator chain 7.

(2) In the embodiment described above, both discharge electrodes 17, 26 were formed by two wires, but these should be made into -main wires.

(Effects of the Invention) As described in detail above, the lightning arrester device of the present invention is able to maintain the connection between the discharge electrode on the energized side even when the tension insulator swings vertically or horizontally around its base end attachment point. The unique shape setting of the ground-side discharge electrode ensures a constant discharge gap at all times, which has the effect of improving lightning protection characteristics in the event of a lightning strike.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the entire lightning arrester device showing one embodiment of the present invention, FIG. 2 is a front view of the lightning arrester device, and FIG. 3 is a right side view showing the entire lightning arrester device. DESCRIPTION OF SYMBOLS 1... Support arm, 7... Suspension insulator chain as a tension insulator, 10... Horn mounting bracket on power supply side, 12...
Power transmission line, 13...Jumper wire, 14...Mounting bracket, 15...Volt, 16...Connector, 17...Discharge electrode on power supply side, 19...Mounting adapter, 20...・・・
Lightning arrester, 21 (22)... - Earthing side (power side) electrode fitting, 24... Mounting fitting, 25... Bracket,
26...Discharge electrode on the ground side, G...Discharge gap, T.
...Rotation trajectory.

Claims (1)

[Claims] 1. A power transmission line (12) is installed and supported on the support arm (1) of the tower body via a tension insulator (7), and the power supply side end of the tension insulator (7) is supported. A discharge electrode (17) on the energized side is cantilever-supported on the support arm (1), and a lightning arrester (20) is attached to the support arm (1) via a mounting adapter (19). In a lightning arrester device for a power transmission line, in which a grounding side discharge electrode (26) facing the discharge electrode (17) with an air discharge gap (G) is attached to the tip of the energized side discharge electrode ( 17) is extended laterally, and when the discharge electrode (17) in a flat state swings horizontally around the attachment point on the steel tower side of the tension insulator (7), the discharge gap (G) is Formed in an arc shape so that it is constant,
On the other hand, when the discharge electrode (26) on the ground side is viewed from the horizontal direction, the tension insulator (7) is formed in an arc shape concentric with the locus (T) of swinging vertically around the attachment point on the steel tower side. A lightning arrester device for a power transmission line, which is characterized by: