JPH03171518A - Discharge electrode for insulator set - Google Patents

Abstract

PURPOSE:To prevent damage to a transmission line due to the transferring of a generated arc by electromagnetic force to the transmission line from an electrode tip part by arranging a discharge electrode on a charge side in the same direction as the transmission line, and providing an arc catching electrode upward extending on both the tip parts of the discharge electrode. CONSTITUTION:The application of a lightning surge to a transmission line 9 causes a surge current to reach a discharge electrode 20 on a charge side via a supporting member 18, to flashover at a discharge gap G in a space with a discharge electrode 24 on a grounding side, and to flow to an iron tower via a current-limiting element 15 in a lightning protection insulator 14 and a fitting adaptor 13 to be grounded. Because an arc catching electrode 20b is provided on both the end parts of an electrode 20 discharge part 20a, even an arc is moved to both the end parts of the discharge part 20a by electromagnetic force, the arc is caught with the electrode 20b to prevent its movement to the transmission line 9. This can prevents damage to the transmission line.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is applicable to the release of insulator devices! This is about @pole. [Prior Art] Generally, when a lightning surge enters a power transmission line, it is discharged toward the steel tower, and the subsequent current is momentarily interrupted by a circuit breaker at a substation, etc. As an example of this, as shown in Japanese Utility Model Application Publication No. 63-22089, an inverted U-shaped jumper horn was attached to a jumper wire. [Problems to be Solved by the Invention] However, in the above-mentioned conventional jumper wire support insulator device, when a lightning surge flashes over from the jumper horn to the impulse horn on the support arm side, the starting point of the arc on the jumper horn is affected by the electromagnetic force. This causes the jumper wire to easily move in the direction of the line, and sometimes the arc directly flashes over from the jumper wire to the impulse horn, causing the jumper wire to melt or melt due to the follow-on current.

This invention was made by focusing on the problems existing in the prior art as described above, and its purpose is to prevent lightning surges from flashing over from the discharge electrode of the power transmission line to the ground side discharge electrode. An object of the present invention is to provide a discharge electrode for an insulator device that can reliably prevent an arc from moving from a discharge electrode that is energized to a power transmission line even when the voltage is not applied.

[Means for Solving the Problems] In order to achieve the above object, the present invention supports a power transmission line on a support arm of a steel tower via a support insulator, and a discharge electrode on the power supply side is mounted on the power transmission line. and a ground-side discharge electrode is provided on the support arm side so as to face the discharge electrode of the voltage application mark with an air discharge gap, in which The method is to install arc-trapping electrodes that are placed in the same direction as the electric wire and extend upward near both ends of the same discharge electrode. [Function] In this invention, since arc capturing electrodes are provided at both ends of the discharge section of the discharge electrode, the arc generated from the discharge section toward the grounded discharge electrode is discharged by the action of electromagnetic force. Even if the arc moves to both ends of the transmission line, it will be captured by the arc capture electrode and will not migrate to the transmission line. [Embodiment] Hereinafter, an embodiment of a lightning arrester device embodying the present invention will be described in detail based on FIGS. 1 to 6. As shown in FIG. 1, a hanging metal fitting 2 is attached to the support arm 1 of the steel tower, and a horn mounting metal fitting 4 is connected to this hanging metal fitting 2 via a U clevis 3. A support insulator 5 is suspended from the horn mounting bracket 4 so as to be swingable in the direction of the railway line and in a direction perpendicular thereto. There is. A horn mounting bracket 7 is connected to the lower end of the support insulator 5, and a plurality of wire clamps 10 for supporting a four-conductor power transmission line 9 are attached to the horn mounting bracket 7 via connection links 8. ．． Both horn mounting brackets 4, 7
Arcing horns 11 and 12 are attached to the supporting insulator 5, and these arcing horns 11 and 12 reduce damage to the creeping flashover of the supporting insulator 5 during an abnormal lightning strike.

As shown in FIGS. 1 and 2, a mounting adapter 13 is fixed in a cantilever manner to the tip of the support arm 1, and extends horizontally in the same direction as the railway line. A pair of 'iR insulators 14 connected in series are attached to the bottom surface of the tip of the mounting adapter 13.
is fixed in a hanging manner, and each M lightning insulator 14 is provided with a current-limiting element 15 having a non-linear voltage-current characteristic.
Arcing rings 16 are provided at both upper and lower ends of both lightning arresters 14.
, 17 are provided respectively, and abnormal ¥R! Damage to the creeping flashover of the lightning arrester 14 during @time is reduced. As shown in FIGS. 1 to 3, the power transmission line 9 includes an iF
A pair of support members 18 are fixedly supported via clamp portions 18a so as to be positioned at a predetermined interval in the #1 direction,
Support plates 19 are fixed to each of these curved surfaces by bolts B. A discharge electrode 20 on the power supply side is fixed at a predetermined height position at the upper end of both support plates 19 via a connecting shaft 21 .

The discharge electrode 20 in which the energization is not applied is formed of a wire material having approximately the same thickness as the power transmission line 9 in a planar shape of an approximately elliptical ring as shown in FIG. A pair of discharge portions 20a extending in parallel to the line direction are provided at substantially the same spacing as the spacing between the discharge portions 9 and 9. In addition, both the left and right ends of this charging side discharge voltage [i20] are formed in an oblique shape so as to be slightly curved upward from both ends of the discharge part 20a, as shown in FIG. It is called electric@20b. As shown in FIG. 2, a grounding electrode 24 is attached to the power supply side electrode fitting at the lower end of the lightning arrester 14. This discharge electrode 24 is supported as follows.

That is, as shown in Fig. 2.5.6, the mounting bracket 3 is equipped with a bracket 33 that is bolted to the power-supplying electrode bracket.
Support rods 34 are connected to both the left and right sides of the support rod 3 in parallel to each other and in an inclined manner that becomes lower toward the tip.
5 is fixed to both ends of the rod 35.
As shown in the figure, it supports a discharge electrode 24 that is divided into hairpin shapes when viewed from above. A gap L for arc capture is provided between the split discharge electrodes 2 and 4, and an arc capture gap L is provided between the split discharge electrodes 2 and 4, and an arc capture gap L is provided in the mounting bracket 32 so as to be located at the center of the gap L. A semicircular arc-shaped center @ pole 36 is interposed. and,
In this embodiment, as shown in FIG. 2, the grounding side discharge lightning pole 24 is horizontally formed in a circular arc shape with a large radius centered near the upper end support portion of the lightning arrester 14, and the power transmission line 9 Even when the power transmission line 9 is swayed horizontally by wind or the like, the charging side discharge electrode 20 on the power transmission line 9 always faces the grounded open current electrode 24 with a predetermined air discharge gap G. Note that the gap length of this air discharge gap G is equal to the length of the elongated hole 28 through which the bolt B is inserted in the vertical direction with respect to the support plate 28.
a is shaped and can be adjusted by adjusting the height of the discharge section 20a. Next, the operation of the lightning arrester device constructed as described above will be explained. Now, when a lightning surge caused by a lightning strike is applied to the power transmission line 9, the surge current at this time passes through the support member 18, etc., and then the discharge voltage [! 20, and is flashed over in the air discharge gap G between the discharge electrode 20 and the grounding discharge electrode 24, and is connected to the steel tower via the current limiting element 15 in both lightning arresters 14, the mounting adapter 13, etc. It flows to support arm 1 and is grounded. Then, the subsequent arc generated thereafter is interrupted by the restoration of the resistance value of the air discharge gap G and the current limiting element 15. In this embodiment, the discharge electrode 20 on the power supply side has a pair of discharge portions 20a extending horizontally in the line direction at substantially the same spacing as the arrangement spacing of the power transmission line 9 above the power transmission line 9.
is provided, so that when the surge current tries to flashover from the power transmission line 9 to the grounding discharge electrode 24, the current will be transferred to the power transmission line 9. The discharge t is not directly discharged from above, but is discharged from one of the discharge parts 20a of the energized discharge electrode 20.
'[i 2 4 is discharged. Therefore, there is no risk that the power transmission line 9 will be damaged by direct discharge from the power transmission line 9 to the ground side discharge t[i 2 4. In particular, in this invention, both @ of the discharge part 20a of the discharge electrode 20
Since the arc trapping @pole 20b is provided in the section, the arc flashing over from the discharge section 20a toward the grounded discharge electrode 24 is captured by the discharge section 20a due to the action of electromagnetic force.
Even if it moves to both ends of the arc, it is captured by the arc capturing heavy pole 20b and is prevented from moving to the power transmission line 9.

Here, the shapes of the discharge voltage 'Ifl20 on the charging side and the discharge S lfj24 on the grounding side were formed as described above, and an arc resistance test was conducted under the conditions of a current of 50 KAX for 0.2 seconds. As a result, the stability of the arc The results were good, and no arc migration from the discharge electrode to the power transmission line 9 was observed. In the above embodiment, the discharge portion 20a of the energized release electrode 20 is provided in the horizontal direction, and the energization (by facing orthogonally to the FI electrode,
Compared to the case where the discharge electrode is formed into a ring shape so as to surround the power transmission line 9, the overall shape of the discharge electrode 20 becomes smaller and its weight can be reduced. Zuru discharge electricity f! Since the opposing area of 20 becomes smaller, the capacitance of the discharge gap G decreases and its shared voltage increases, and as a result, the overall flashover voltage required to flashover the discharge gap G decreases. It is possible to improve the insulation coordination with the support insulator 5, and to expect the same withstand voltage characteristics against switching surges. [Another Example] Next, another actual tumor example embodying this invention is shown in FIGS. 7 to 1.
The explanation will be based on Figure 0. In another example shown in FIGS. 7 and 8, both ends of the discharge electrode 20 are bent downward, and a semicircular arc is formed through a support rod 25 to the support plate 19 so as to be close to the ends. It supports the capture @pole 26. In this other example as well, since the arc moved from the discharge electrode 20 to its end by electromagnetic force is captured by the arc capture electrode 26, flashover of the arc directly from the power transmission line 9 can be prevented. As shown in FIG. 9, the center @pole 36 provided on the ground side radiating electrode 24 may be omitted. As shown in Figure 10,
The discharge electrode 24 for grounding is made into a shape with the lower center open by curving parallel conductive rods. It should be noted that the present invention is not limited to the structure of the embodiment described above, but can be modified and embodied as follows. (1) The waveform of the discharge portion 20a of the discharge electrode 20 when the voltage is not applied is determined. (2> The discharging electrodes 20 on the energizing side are disposed facing each other with their tips 20b in an open configuration. (3) The support member 18 and the spring support plate 19 for supporting the discharging electrode 20 on the energizing side are arranged facing each other. It is made of an insulating material, and the discharge electrode 20 of the voltage charging gate is connected to the horn mounting bracket 7 at the lower end of the support insulator 5 via a flexible lead wire.In this case, in the event of an accident, the support member 18 and the support plate 19 Since no t-current flows through them, it is possible to prevent them from being burnt out. (4) To embody this invention into a power transmission line support insulator device that does not have a lightning arrester. (5) As shown in Fig. 11. As shown, in order to cancel the twisting moment of the power transmission line 9 that is likely to occur due to the discharge electrode 20 protruding from the power transmission line 9, and to place the discharge electrode 20 in a predetermined position,
A balance weight 27 connected to the support plate 19 may be provided at the bottom of the power transmission line 9. (6) As shown in FIG. 12, the lower end flange portion 28a of the connecting plate 28 is tightened and fixed to the upper surface of the flat balance weight 27 with bolts 29 and nuts 30, and the upper end portion of the connecting plate 28 is fixed to the supporting member 18. It should be possible to fix it with bolts.

(7) As shown in FIG. 13, the balance weights 27 are housed in a stacked manner in the square frame-shaped holding frame 41, and the bolts 29
and fixing with nuts 30, attaching a mounting plate 42 to the upper part of the holding frame 41, and attaching this mounting plate 42 to the support member 18.

(8) As shown in FIG. 14, rod-shaped balance weights are connected in the form of a flat plate via a connecting plate 43, and a mounting plate 43a formed at the center of the connecting plate 43 is attached to the support member 18. thing. Additionally, a ring-shaped balance weight 27 may be used as shown in Fig. 15. (9) As shown in FIG. 16, a discharge t [20
A pair of support plates 19 attached to the base plate 19 are supported by bolts so as to be able to adjust the position in the vertical direction and the angle of inclination. [Effects of the Invention] As explained above, in this invention, an arc is discharged by electromagnetic force! This has the effect of preventing damage to the electric wire from being transferred from the tip of the pole to the t-wire.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of this invention in a lightning arrester hook device, Fig. 2 is a cross-sectional view of the same, and Fig. 3 is an enlarged view of the discharge electrode on the energized side. Front view, Figure 4 is the 3rd
Figure 5 is a plan view of only the grounding discharge electrode, Figure 6 is a right side view, Figure 7 is a front view showing another example of the charging side discharge electrode, and Figure 8 is the same. A perspective view, FIG. 9 is a front view showing another example of the ground side discharge electrode, FIG. 10 is a perspective view showing another example of the ground side discharge electrode, and FIG. 11 is a front view showing another example of the ground side discharge electrode. FIG. 12 is a perspective view showing another example of the balance weight, FIG. 13 is a front view showing another example of the balance weight, FIGS. 14 and 15 are perspective views showing another example of the balance weight, and FIG. 16 is a perspective view showing another example of the balance weight. FIG. 7 is an exploded perspective view showing another example of the discharge electrode. DESCRIPTION OF SYMBOLS 1... Support arm, 5... Support insulator, 9... Power transmission line, 14... Lightning arrester, 15...
Current limiting element, 20...Discharge when the voltage is opened! Extreme, 20a...
discharge section, 20b. 26... arc capturing electrode, 24...
...Discharge electrode of ground bend, G...Air discharge gap.

Claims (1)

[Claims] 1. A power transmission line (9) is supported on a support arm (1) of a steel tower via a support insulator (5), and a discharge electrode (20 ), and a grounding side discharge electrode (24) is provided on the support arm (1) side, and a discharge electrode (24) on the energized side is provided on the side of the support arm (1).
20), the discharge electrode (20) on the energizing side is arranged in the same direction as the power transmission line (9), and A discharge electrode for an insulator device, characterized in that arc trapping electrodes (20b) extending upward are provided near both ends of the discharge electrode (20).