JP2690163B2 - Lightning arrester device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention promptly grounds an abnormally high voltage caused by lightning when applied to a power transmission line, and suppresses a follow-up arc generated thereafter. The present invention relates to a lightning arrester device for quickly extinguishing an arc and preventing a power failure due to a ground fault of a transmission line.

[Prior Art] The applicant of the present invention applied for a previous patent application (Japanese Patent Application No. 1-7362).
No. 3) proposed a lightning protection insulator device having the following configuration.

In this prior application configuration, as shown in FIGS. 20 and 21, a transmission line 9 is supported by a support arm 1 of a steel tower via a support insulator (not shown), and the support arm 1 has a voltage-current characteristic. Is equipped with a lightning protection insulator 14 having a built-in non-linear current limiting element 15, a discharge electrode 20 on the side of voltage application is provided on the transmission line 9, and a discharge electrode 24 on the ground side is provided on the lightning protection insulator 14.
Are provided so as to face the discharge electrode 20 on the charging side with a predetermined air discharge gap G.

Further, in this prior application configuration, the shape of the discharge electrode 20 is devised to draw out the electric field relaxation action. Therefore, the pair of large-diameter arc-shaped discharge portions is particularly provided on the discharge electrode 20 on the charging side.
20a is provided, and the discharge portion 20a is arranged at a predetermined interval in the line direction in a state of surrounding the power transmission line 9.

[Problems to be Solved by the Invention] However, in the configuration of this prior application, the charge-side discharge electrode
Since the discharge part 20a of 20 is formed in a large-diameter arc shape and is arranged so as to surround the power transmission line 9, the discharge electrode on the power-supply side is formed.
The size of the wire 20 is determined from the size of the wire array and becomes larger than the wire array, and the total flashover voltage against the lightning surge between the current limiting element 15 and the portion constituted by the air gap G is determined by the current limiting element 15 C1 is the capacitance of
V1, capacitance of air discharge gap G is C2, its shared voltage is V2
In such a case, the shared voltage V2 is represented by the magnitude of the applied voltage when it exceeds the flashover voltage of the air discharge gap G alone.

On the other hand, the electrostatic capacitance C2 is determined by the facing area of the discharge electrode 20 determined by the wire arrangement. Therefore, by reducing the electrostatic capacitance C2 of the aerial discharge gap G, the sharing voltage V2 of the discharge gap G can be reduced. There was still room for improvement by increasing the size, reducing the overall flashover voltage, and further improving the insulation coordination with the supporting insulator.

The present invention has been made by paying attention to the problems existing in such a conventional technique, and the purpose thereof is to positively reduce the electric field relaxation action of multiconductors used for high-voltage lines. By making use of it, the discharge electrode on the charging side can be made smaller and lighter, and by reducing the facing area of the discharge electrode, the overall flashover voltage can be reduced, and the insulation coordination with the support insulator can be reduced. The present invention is to provide a lightning protection insulator device which can improve the performance and can expect the same switching surge withstand voltage characteristics.

Another object of the present invention is, in addition to the above objects, that when an arc discharges between a discharge electrode on a power-supply side and a grounding side, the starting point of the arc on the discharge electrode on the power-supply side is the transmission line from the discharge electrode. Another object of the present invention is to provide a lightning protection insulator device that can reliably prevent the lightning protection device from moving to the side.

[Means for Solving the Problems] In order to achieve the above object, the invention according to claim 1 supports a transmission line on a support arm of a steel tower via a support insulator, and the support arm has a voltage-current. A lightning arrestor with a built-in current limiting element having a non-linear characteristic is mounted, and a discharge electrode on the charging side is provided on the power transmission line, and a discharge electrode on the ground side is provided on the lightning arrester and a discharge electrode on the charging side. In the lightning arrester device provided so as to face each other with a predetermined air discharge gap, the discharge electrode on the power-supply side has a line direction with an interval substantially the same as an arrangement interval of the transmission line above the transmission line. A pair of horizontally extending discharge parts are provided at the same time, and the tip ends of the discharge electrodes are positioned within the arrangement interval of the power transmission lines.

The invention according to claim 2 is the one in which the tip of the discharge electrode on the charging side is covered with an insulating material.

Further, in the invention according to claim 3, a gap is provided at the center of the discharge electrode on the charging side.

According to a fourth aspect of the present invention, a gap is provided in the center of the discharge electrode on the charging side, and a center electrode is provided in the gap.

[Operation] In the lightning arrester device according to claim 1, the discharge electrodes on the charging side are simplified until a pair of discharge portions extending in the line direction are provided at intervals substantially the same as the arrangement interval of the transmission lines. Since the ring-shaped portion orthogonal to the electric wire is eliminated as in the conventional case, the entire discharge electrode is small and lightweight. In addition, since the facing area of the discharge electrode is small, the overall flashover voltage is small, the insulation coordination with the support insulator is high, and the discharge part is provided almost directly above the wire to sufficiently reduce the electric field of the wire. Therefore, the same withstand voltage characteristics against switching surge can be expected.

In the lightning arrester device according to any one of claims 2 to 4, the arc caused by the short-circuit current at the time of an accident is transferred from the tip of the discharge electrode to the electric wire by the electromagnetic force, the insulating material (25), the gap (L1),
Alternatively, it can be prevented by the central electrode (31). When the interval (L1) is provided, the electromagnetic force acting on the arc near the discharge part is directed to the center of the discharge electrode by the magnetic field generated by the current flowing in one discharge part, and the arc is transferred to the power transmission line. Prevent.

[Embodiment] An embodiment of the lightning arrester device embodying the invention of claim 1 will be described in detail below with reference to FIGS. 1 to 3.

As shown in FIG. 1, a suspension metal fitting 2 is attached to a supporting arc 1 of a steel tower, and a U clevis 3 is attached to the suspension metal fitting 2.
The horn mounting bracket 4 is connected via the. A supporting insulator 5 is suspended and supported on the horn mounting bracket 4 so as to be swingable in a line direction and a direction orthogonal to the line direction. In this embodiment, the supporting insulator 5 is constituted by a suspension insulator series formed by connecting a plurality of suspension insulators 6 in series. I have. A horn mounting member 7 is connected to a lower end portion of the support insulator 5, and a plurality of electric wire clamps 10 for supporting a 4-conductor power transmission line 9 are mounted on the horn mounting member 7 via a connecting link 8. . The arcing horns 11 and 12 are attached to the horn mounting brackets 4 and 7, and the arcing horns 11 and 12 support the insulator 5 during abnormal lightning strikes.
Damage to the surface flashover is reduced.

As shown in FIGS. 1 and 2, a mounting adapter 13 is fixed to the tip of the support arm 1 in a cantilever manner and extends horizontally in the same direction as the line. A pair of lightning protection insulators 14 connected in series are suspended and fixed to the lower surface of the tip of the mounting adapter 13. Inside each lightning protection insulator 14, a current limiting element 15 having a non-linear voltage-current characteristic is provided. Double Lightning Insulator 14
Arcing rings 16 and 17 are provided at both upper and lower ends of the lightning insulator, and damage to the surface flashover of the lightning protection insulator 14 at the time of abnormal lightning is reduced.

As shown in FIG. 1, a pair of support members 18 are fixedly supported via a clamp portion 18a on the power transmission line 9 so as to be positioned at a predetermined interval in the line direction, and a screw is provided at the center of the upper surface of them. Each bar 19 is erected. As shown in FIG. 3, the discharge electrode 20 on the charging side is provided at the upper end of both screw rods 19,
Through the mounting plate 21 that has the smallest possible width, insert the nut 22
Is fixed at a predetermined height position.

The discharge electrode 20 on the charging side is formed of a wire material having substantially the same thickness as the power transmission line 9 into a planar, substantially elliptical ring shape. A pair of discharge parts 20a extending parallel to the line direction are provided at intervals of. Also, this charging side discharge electrode 2
The tip portion 20b of 0 is formed so as to be curved slightly downward from both ends of the discharge portion 20a, and is arranged in the arrangement interval of the power transmission lines 9.

As shown in FIG. 1 and FIG. 2, a bracket 23 is fixed to the charge-side electrode metal fitting at the lower end of the lightning protection insulator 14, and a ground-side discharge electrode 24 is attached to this bracket 23. . The ground-side discharge electrode 24 is formed in a ring shape, and circular arc-shaped concave portions 24a (see FIG. 1) are provided on the lower portions on both front and rear sides thereof, and circular arc-shaped convex portions 24 are formed on the lower right and left portions.
b (see FIG. 2) is provided.

Further, in this embodiment, the discharge electrode 24 on the ground side is
The convex portion 24b of the lightning insulator 14 is configured to have an arc shape with a large radius around the upper end supporting portion of the lightning insulator 14, and even when the power transmission line 9 is swayed by wind or the like, the The discharge part 20a of the charging side discharge electrode 20 is connected to the ground side discharge electrode 2
The four convex portions 24b are always opposed to each other with a predetermined air discharge gap G.

The gap length of the air discharge gap G is adjusted by adjusting the mounting height position of the mounting plate portion 21 with respect to the screw rod 19 on the support member 18 to change the mounting position of the power-discharging side discharge electrode 20. The setting can be changed easily.

Next, the operation of the lightning protection insulator device configured as described above will be described.

Now, when a lightning surge caused by a lightning strike is applied to the power transmission line 9, the surge current at this time reaches the discharge electrode 20 on the voltage applying side through the supporting member 18 etc., and the discharge electrode 20 and the discharge electrode on the ground side. The light is discharged in the air discharge gap G between the light emitting device and the air conditioner 24, and also flows to the support arm 1 of the steel tower through the current limiting element 15 in both the lightning protection insulators 14 and the mounting adapter 13, etc. The subsequent arc generated thereafter is blocked by the air discharge gap G and the current limiting element 15.

Now, in this embodiment, the discharge electrode 20 on the charging side is
In addition, a pair of discharge parts 20a extending above the power transmission line 9 and extending in parallel to the line direction at intervals substantially the same as the arrangement interval of the power transmission lines 9.
Since the surge current due to the application of the lightning surge caused by the lightning strike is about to be discharged from the power transmission line 9 to the discharge electrode 24 on the ground side, the current is
It is not directly discharged from above, but is discharged from one of the discharge parts 20a of the charging side discharge electrode 20 to the ground side discharge electrode 24. Therefore, from the power transmission line 9 to the ground side discharge electrode
There is no risk of damage to the transmission line 9 due to direct discharge to 24.

Further, since the discharge portion 20a of the charging side discharge electrode 20 is configured as described above, the ring-shaped portion of the prior art is eliminated and the shape of the discharge electrode 20 as a whole is reduced in size to reduce its weight. You can Further, since the facing area of the discharge electrode 20 becomes smaller, the electrostatic capacity of the discharge gap G becomes smaller and the shared voltage becomes larger. As a result, the overall flashover voltage required for flashing the discharge gap G becomes large. Is smaller than that of the conventional example, the insulation coordination with the supporting insulator 5 can be improved, and an equivalent withstand voltage characteristic against a switching surge can be expected.

[Another embodiment] Next, another embodiment of the charging electrode 20 will be described with reference to Figs.

First, in the embodiment (claim 2) shown in FIG.
The tip portion 20b of the charging side discharge electrode 20 is covered with an insulating material 25 made of EPDM or silicon. Therefore, the arc that accompanies the short-circuit current at the time of an accident, etc.
Even when the discharge portion 20a of 20 is to be moved from the discharge portion 20a to the tip portion 20b side, the insulating material 25 prevents the arc from moving from the tip portion 20b of the discharge electrode 20 to the electric wire. This can prevent the electric wire from being damaged.

Next, in the embodiment shown in FIG. 5, arc spots 26 are provided so as to project upward in the vicinity of both ends of the discharge portion 20a of the charging electrode 20. Therefore, also in this embodiment, when the arc accompanied by the short-circuit current at the time of an accident is moved by the electromagnetic force from the discharge part 20a of the discharge electrode 20 to the tip part 20b side, the arc moves by the arc spot 26. This prevents the arc from moving from the tip portion 20 of the discharge electrode 20 to the electric wire.

Next, an embodiment embodying the invention described in claim 3 will be described with reference to FIGS. 6 to 11.

In this embodiment, the discharge electrode 20 on the charging side is divided into the sixth,
As shown in FIG. 8, a gap L1 for capturing an arc is formed, and connecting rods 27 are horizontally inserted in the discharge portions 20a, respectively, and a supporting plate 28 is fixed downward on the lower surface of the central portion of the connecting rod 27. Further, both support plates 28 are connected to each other by a horizontal support plate 29, and both support plates 28 are fastened and fixed to the support member 18 with bolts B. The support plate
A long hole 28a through which the bolt B is inserted is formed in the up-down direction, and the height of the discharge part 20a (discharge gap G) can be adjusted. Further, a vertical support plate 30 is erected on the upper surface of the horizontal support plate 29, and a center electrode 31 in the shape of a semi-arc for catching an arc that also serves as corona prevention is provided at the center of the gap L1 at the upper end thereof. It is interposed so as to be located.

On the other hand, the ground-side discharge electrode 24 is supported as follows. That is, as shown in FIG. 7 and FIGS. 9 and 10, the support rods 34 are connected to the left and right sides of the mounting bracket 32 having the bracket 33 in parallel with each other and in an inclined shape in which the tip is lowered. A connecting rod 35 is fixed to the tip of the support rod 34 so as to be orthogonal to each other, and further, a pair of discharge electrodes 24, which are divided and formed in a hairpin shape when seen in a plan view from both ends of the rod 35, face each other. Support. A gap L2 for capturing an arc is also provided between the divided electrodes, and the mounting bracket 32 is positioned in the center of the gap L2 and has a semi-arc shape for capturing an arc that also serves as corona prevention. The central electrode 36 forming the

Therefore, in this embodiment, when an arc is formed in the discharge part 20a, a current flows only in one discharge part 20a, and a magnetic field created by the discharge part 20a applies an electromagnetic force acting on the arc near the discharge part 20a to the discharge electrode. The arc is discharged from the center electrode 33 to the discharge electrode 24 on the ground side toward the center of 20, so that the movement of the starting point of the arc from the discharge part 20a to the tip part 20b is suppressed, and the arc is transmitted from the power transmission line 9 to the arc. It is possible to reliably prevent the discharge electrode 24 on the ground side from moving.

Further, in the embodiment shown in FIGS. 6 to 11, only the center electrode 31 may be omitted to provide the lightning protection insulator device of claim 3. Also in this case, the stability of the arc described above can be expected.

The present invention is not limited to the configuration of each of the above embodiments, but can be embodied with the following modifications.

(1) To form the discharge portion 20a of the discharge electrode 20 on the charging side in a waveform.

(2) The distal end portion 20b of the discharge electrode 20 on the voltage applying side should be arranged to face each other with an open configuration.

(3) Supporting member 18 for supporting the discharge electrode 20 on the charging side
Also, the screw rod 19 is formed of an insulating material, and the discharge electrode 20 on the charging side is connected to the horn mounting bracket 7 at the lower end of the supporting insulator 5 via a flexible lead wire. In this case, since no current flows through the supporting member 18 and the screw rod 19 in the event of an accident, it is possible to prevent their burning.

(4) As shown in FIG. 12, the central electrode 36 provided on the ground side discharge electrode 24 is omitted.

(5) As shown in FIG. 13, the discharge electrode 24 on the ground side has a shape in which conductive rods parallel to each other are curved to open the lower central portion.

(6) As shown in FIG. 14, the twisting moment of the power transmission line 9 that tends to be generated by the discharge electrode 20 protruding from the power transmission line 9 is canceled out so that the discharge electrode 20 is placed at a predetermined position. The lower part may receive the balance weight 27 connected to the support plate 19.

(7) As shown in Fig. 15, the flat balance weight 27
The lower end flange portion 28a of the connecting plate 28 is fastened and fixed to the upper surface of the connecting plate 28 with bolts 29 and nuts 30, and the upper end portion of the connecting plate 28 can be fixed to the support member 18 with bolts.

(8) As shown in FIG. 16, the balance weight 27 is housed in a laminated manner in a rectangular frame-shaped holding frame 41, and a bolt 29 and a nut are attached.
It is fixed by 30, and the mounting plate 42 is mounted on the upper part of the holding frame 41, and the mounting plate 42 is mounted on the supporting member 18.

(9) As shown in FIG. 17, a rod-shaped balance weight 27
Are connected in a flat plate shape via a connecting plate 43, and a mounting plate 43a formed in the central portion of the connecting plate 43 is attached to the supporting member 18. Also, use a ring-shaped balance weight 27 as shown in FIG.

(10) As shown in FIG. 19, a pair of support plates 19 attached to the discharge electrodes 20 can be vertically adjusted with respect to a rectangular frame-shaped holding frame 44 interposed between the pair of support members 18. Also, support the position of the tilt angle so that it can be adjusted.

[Effects of the Invention] As described above, the invention according to claim 1 can reduce the size and weight of the discharge electrode on the side of charging, and further reduce the facing area of the discharge electrode. The flashover voltage can be reduced, the insulation coordination with the support insulator can be improved, and an equivalent withstand voltage characteristic against a switching surge can be expected, which is an excellent effect.

In addition to the effects of the invention of claim 1, the inventions of claims 2 to 4 can prevent the arc from moving from the tip of the discharge electrode to the wire and damaging the wire due to electromagnetic force. Play.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a lightning arrester device embodying the invention of claim 1, FIG. 2 is a side sectional view of the same, and FIG. 3 is an enlarged view of a discharge electrode on a power supply side. Perspective views, FIGS. 4 and 5 are partial perspective views showing another embodiment of the discharge side discharge electrode, respectively, and FIG. 6 is a front view of a lightning arrester device embodying the invention of claim 4. 7 is a right side view of FIG. 6,
FIG. 8 is an enlarged front view of the charging side discharge electrode, FIG. 9 is an enlarged plan view of the charging side discharge electrode, FIG. 10 is a plan view of the ground side discharge electrode, and FIG. 11 is the ground side discharge electrode. Right side view of
FIG. 12 is a front view showing another example of the ground side discharge electrode, FIG. 13 is a perspective view showing another example of the ground side discharge electrode, FIG. 14 is a front view showing the mounting state of the balance weight, and FIG. Is a perspective view showing another example of the balance weight, FIG. 16 is a front view showing another example of the balance weight, FIGS. 17 and 18 are perspective views showing another example of the balance weight, and FIG. 19 is a discharge electrode. FIG. 20 is an exploded perspective view showing another example, FIG. 20 is a front view showing a lightning arrester device having a prior application configuration, and FIG. 21 is a side sectional view of the same. 1 ... support arm, 5 ... support insulator, 9 ... transmission line, 14
...... Lightning arrester, 15 ...... Current limiting element, 20 ...... Discharge electrode on charging side, 20a ...... Discharge part, 20b ...... Tip part, 24 ...... Discharge electrode on ground side, 25 ...... Insulation material, 31 …… Center electrode, L1, L2 …… Gap, G …… Air discharge gap.

Claims (4)

(57) [Claims] 1. A supporting insulator (5) for a supporting arm (1) of a tower.
A power transmission line (9) through the support arm (1)
A lightning protection insulator (14) having a built-in current limiting element (15) with a non-linear voltage-current characteristic is attached to the power transmission line (9), and a discharge electrode (20) on the power-supply side is provided on the transmission line (9). A lightning protection device in which a grounding side discharge electrode (24) is provided on the lightning protection insulator (14) so as to face the charging side discharge electrode (20) with a predetermined air discharge gap (G). The discharge electrode (20) on the charging side is provided with a pair of discharge parts (20a) extending in the line direction above the power transmission line (9) at intervals substantially the same as the spacing of the power transmission lines (9). At the same time, the lightning protection insulator device is characterized in that the tip portion (20b) of the discharge electrode (20) is positioned within the arrangement interval of the power transmission line (9). 2. The lightning arrester device according to claim 1, wherein an insulating material (2) is attached to a tip end portion (20b) of the discharge electrode (20) on the charging side.
5) Lightning arrester device characterized by being coated with 3. The lightning arrester device according to claim 1, wherein a gap (L1) is provided in a central portion of the discharge electrode (20) on the side of charging. 4. The lightning arrester device according to claim 1, wherein a gap (L1) is provided in a central portion of the discharge electrode (20) on the charging side, and a center electrode (31) is provided in the gap (L1). A lightning protection insulator device characterized by being provided.