JPH07262852A - Lighting resistant horn insulator device - Google Patents

Abstract

PURPOSE:To provide a lighting resistant horn insulator device which prevents a discharge electrode on the electric charging side, which is installed to a jumper wire support insulator, from excessively approaching a discharge electrode on the grounding side, which is installed on a lightening protection insulator, in the case of lateral rock of a jumper wire, and thereby enhance operation reliability. CONSTITUTION:Let a jumper wire 10 be carried by the support arm 1 of a steel tower via a support insulator 12, and let a discharge electrode 15 at the electric charging side be carried by the electric charging side of the support insulator 12. Let lightening protection insulators 21 and 22 be carried by the support arm 1 side, and the lightening protection insulator 22 is provided with a discharge electrode 39 at the grounding side, which is faced to the discharge electrode 15 with a specified discharge gap G spaced. An insulating bar 45 is installed onto the lighting protection insulator 22, which prevents the discharge electrode 15 on the electric charging side from approaching the discharge electrode 39 on the grounding side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightning protection horn insulator device.

[0002]

2. Description of the Related Art As an insulator device for supporting a transmission line on a steel tower, there is a tension-resistant support insulator device including a jumper wire. When applying a lightning protection insulator to this device, a jumper wire is grasped by a support insulator suspended from the tip of a support arm of a steel tower so that it can swing, and a discharge electrode on the charging side is attached to the lower end of this support insulator. Cantilevered. In addition, a lightning arrester provided with a resistance element having a non-linear voltage-current characteristic is suspended and fixed in a cantilever state at an intermediate portion of the support arm. At the lower end of this lightning protection insulator, a ground-side discharge electrode, which opposes the charge-side discharge electrode with a predetermined air discharge gap, is cantilevered. Then, when a lightning surge current enters the power transmission line, it flows over the discharge gap from the discharge electrode on the voltage application side to the discharge electrode on the ground side, then flows to the resistance element of the lightning protection insulator, and discharges to the tower. To be done. The subsequent current flowing thereafter is limited by the restoration of the resistance value of the resistance element and finally cut off at the discharge gap, thereby preventing a ground fault accident due to the operating voltage.

Further, at the lower end of the jumper wire support insulator,
A weight is attached to suppress swinging of the jumper wire due to wind pressure or the like and to keep the gap between the two discharge electrodes constant.

[0004]

In the above-mentioned lightning protection horn insulator device, the jumper wire and the supporting insulator are laterally swayed by wind pressure or the like. The rolling may interfere with the rolling motion of the transmission line, and the jumper wire may swing beyond the prediction. In this case, the discharge electrode on the voltage application side comes too close to the discharge electrode on the ground side. For this reason, the discharge gap becomes significantly smaller than the set value, and when a lightning strike occurs, the follow current due to the operating voltage cannot be interrupted. In such a state, the function as the lightning protection horn insulator device is lost.

It is an object of the present invention to prevent the discharge electrode on the voltage applying side attached to the jumper wire support insulator from coming too close to the discharge electrode on the ground side attached to the lightning protection insulator when the jumper wire rolls. An object of the present invention is to provide a lightning protection horn insulator device capable of reliably interrupting the follow current and improving the electrical reliability.

[0006]

According to a first aspect of the invention, a power transmission line is supported by a support arm of a steel tower via a support insulator,
A discharge electrode on the power-supply side is supported on the power-supply side of this support insulator, while a lightning protection insulator is supported on the support arm side, and this lightning-protection insulator has a predetermined discharge gap with the discharge electrode on the power-supply side. In the lightning protection horn insulator device provided with the opposing grounding side discharge electrode, the lightning arrestor or the support arm is provided with a blocking means for preventing the discharge side electrode on the power supply side from approaching the discharge electrode on the ground side.

According to a second aspect of the present invention, in the first aspect, the blocking means is constituted by an insulating rod supporting the lightning side of the lightning protection insulator, and an insulating jacket having a fold portion formed on the outer periphery thereof. There is.

[0008]

According to the first aspect of the present invention, when the power transmission line laterally sways together with its supporting insulator due to wind pressure or the like, the power transmission line also oscillates together with the discharge electrode on the voltage application side. Even if the discharge electrode tries to move for a predetermined distance in the direction of reducing the discharge gap, the discharge electrode on the voltage applying side is blocked by the movement blocking means. Therefore, the discharge gap is maintained at a predetermined value or more, and the follow current interruption characteristic after the intrusion of the lightning surge current is secured.

[0009]

Embodiment An embodiment embodying the present invention will be described below with reference to FIGS. A mounting plate 2 is fixed to the tip of the support arm 1 of the steel tower, and a pair of left and right tension insulators 5, 6 are connected to the plate 2 via ground side connecting metal fitting units 3, 4. The power transmission line 9 is held at the ends of the insulators 5 and 6 on the power-supply side via the power-supply-side connecting metal fitting units 7 and 8. Both ends of the jumper wire 10 are connected between the power application side connecting metal fitting units 7, 8. Furthermore, a jumper wire support insulator 12 is swingably suspended at the tip of the support arm 1 via a grounding side connecting metal fitting unit 11, and a connecting yoke 13 for connecting the jumper wire 10 is supported at the lower end thereof. ing. A weight 14 is attached to the yoke 13 to suppress the swing of the support insulator 12 and the jumper wire 10. In addition, York 1
A discharge electrode 15 on the voltage application side is horizontally supported by 3.
An arc ring 16 is supported on the opposite side of the discharge electrode 15 to prevent the support insulator 12 from being damaged by creeping flash.

As shown in FIG. 1, a mounting plate 20 is fixed to an intermediate portion of the support arm 1, and a lightning protection insulator 21 is mounted on the lower surface of this plate. Another lightning protection insulator 22 is connected in series to the lower end of the lightning protection insulator 21. As shown in FIG. 3, the two lightning protection insulators 21 and 22 are insulated from each other by a tension-resistant insulating tube 23 made of a reinforced resin or the like having excellent mechanical strength, a resistance element 24 having a non-linear voltage-current characteristic housed therein, and an insulation element. Tube 23
Electrode fittings 2 on the grounding side and the charging side that are fitted and fixed to the end of the
5, 26 and an insulating jacket 27 molded on the outer circumference of the insulating cylinder 23.

The electrode fitting 25 of the lightning protection insulator 21 is fixed to the mounting plate 20 by bolts 28 and nuts 29. Further, the metal fittings 26, 25 of the two lightning protection insulators 21, 22
Is also tightened and fixed by a bolt 30 and a nut 31.

As shown in FIG. 4, a bracket 35 having an insertion hole 35a for a bolt 36 is integrally formed with the power-supply-side electrode fitting 26 located at the lower end of the lightning protection insulator 22. A mounting plate 38 is attached to the bracket 35 by a bolt 36.
And the nut 37 for tightening. This mounting plate 38
A discharge electrode 39 on the ground side, which faces the discharge electrode 15 on the charging side with a predetermined air discharge gap G, is welded and fixed thereto. Further, an arc ring 40 for preventing the flashover of the lightning protection insulators 21, 22 is attached to the bracket 35 by the bolt 36 and the nut 37 via the attachment plate 41. Also, the connecting fittings 26, 25 and the mounting plate 2
An arc ring 42 that prevents damage from the surface flashover of the lightning protection insulators 21 and 22 is also attached to 0.

An insulating rod 45 as a means for preventing the discharge electrode 15 on the charging side from approaching is supported on the bracket 35 of the electrode fitting 26. A mounting bracket 47 is fitted and fixed to the base end of a rod 46 made of a reinforced resin (FRP) located at the center of the insulating rod 45. This mounting bracket 47
A plate 48 attached to the bracket 35 by a bolt 36 and a nut 37 is integrally formed therewith.
Further, a fold 49a made of EPDM rubber is provided on the outer periphery of the rod 46.
An insulating jacket 49 having is formed by molding. The tip of the insulating rod 45 is arranged on the swing locus of the discharge electrode 15 on the charging side.

The operation of the tension insulator device constructed as described above will be described. Now, when a lightning surge current enters the power transmission line 9 in FIG. 2, this current flashes over the air discharge gap G from the power applying side connecting metal unit 7, the jumper wire 10, the connecting yoke 13, and the power applying side discharge electrode 15. And flows to the ground side discharge electrode 39. Further, it flows through the resistance element 24 built in both the lightning protection insulators 21 and 22, and is discharged to the support arm 1. The subsequent current based on the operating voltage that follows thereafter is limited by the restoration of the resistance value of the resistance element 24 and interrupted by the discharge gap, thereby preventing a ground fault.

When the power transmission line 9 and the jumper line 10 are swung in the direction orthogonal to the line due to wind or the like, the jumper line support insulator 12 is swung about its upper suspension point. Due to this swing, the discharge electrode 15 on the charging side is moved toward the discharge electrode 39 on the ground side, and when the swing angle exceeds a predetermined value, the electrode 15
Hits the tip of the insulating rod 45 and is stopped. As a result, the electrode 15 does not come too close to the electrode 39, and the operational reliability of the lightning protection horn insulator device can be improved.

Since the swing of the support insulator 12 is caused by the wind pressure, the energy is attenuated by the time the discharge electrode 15 hits the insulating rod 45, and the pressing force is not shocking. This pressing force is mainly supported by the insulating cylinder 23 of the lightning protection insulators 21, 22 and the rod 46 of the insulating rod 45.

Further, since the insulating rod 45 has the rubber insulating jacket 49, when the electrode 15 collides with the jacket 49, the shock can be mitigated. The electrode 15 is an insulating rod 45
In the state of hitting, the insulation strength between the lightning protection insulators 21 and 22 and the insulating rod 45 alone is sufficient to withstand the flashover due to the operating voltage. This insulation strength is the lightning protection insulators 21 and 22.
Since the design is set to a predetermined value according to the voltage class, it is necessary to appropriately set the insulation strength such as the air insulation length of the insulating rod 34 and the creepage surface insulation length.

The discharge electrode 15 on the charging side is an insulating rod 45.
The distance of the discharge gap G when the swing is stopped by
It is set to a value that can withstand the commercial frequency voltage equivalent to the healthy phase rise voltage when the line is grounded under the water injection condition, that is, the minimum value that can interrupt the follow current.

The present invention is not limited to the above embodiment, but can be embodied as follows. (1) As shown in FIG. 5, an insulating rod 45 is attached to the support arm 1 of the steel tower, and the insulating rod 45 regulates the position of the discharge electrode 15 on the voltage applying side.

In the case of this alternative example, since it is not necessary to increase the mechanical strength of the lightning arrester insulators 21 and 22, the lightning arrester insulators 21 and 22 are not required.
2 can be easily manufactured. (2) Although not shown, connect the base end portion of the insulating rod 45 to the connection portion of both the lightning protection insulators 21 and 22.

In the case of this another example, the lightning protection insulator 21 on the upper side
The mechanical strength of the chisel may be made larger than that of the lightning protection insulator 22 on the lower side. (3) The insulating rod 45 is formed in a linear shape.

(4) To make the tip of the insulating rod 45 large so that it can easily receive the discharge electrode 15. (5) Apply the configuration of the insulating rod 45 described above to the device for suspension tower. The technical ideas other than the claims that can be understood from the above embodiments will be described below along with their effects.

In Claim 1, the insulating rod 45 is a lightning protection horn insulator device which is supported by the support arm 1 of the steel tower. In the case of this device, in addition to the effects described above, the lightning protection insulator 21,
Since the pressing force does not act on 22, the mechanical strength of the lightning protection insulator can be reduced.

The lightning protection horn insulator device according to claim 1, wherein the insulating rod 45 is curved. In addition to the effects described above, this device can easily attach the insulating rod 45 to the lightning protection insulator 22 by bypassing the discharge electrode 39.

Further, in this specification, the insulating rod 45 means
In addition to the above-mentioned examples, for example, long insulators, insulators, rod-shaped or plate-shaped synthetic resin only, etc. are included.

[0026]

As described above in detail, in the invention according to claim 1, when the jumper wire is swayed, the discharge electrode on the power-supply side attached to the jumper wire support insulator is connected to the ground side attached to the lightning arrester. The reliability of the lightning protection horn insulator device can be improved by preventing the discharge electrode from coming too close.

[Brief description of drawings]

FIG. 1 is a side view of a lightning protection horn insulator device according to an embodiment of the present invention.

FIG. 2 is a front view of a lightning protection horn insulator device.

FIG. 3 is a sectional view of a lightning protection insulator and an insulating rod.

FIG. 4 is a perspective view of an insulating rod.

FIG. 5 is a front view showing another example of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Support arm, 14 ... Jumper wire, 15 ... Charging side discharge electrode 21, 22 ... Lightning arrester, 39 ... Grounding side discharge electrode, 45 ... Insulating rod, 46 ... Rod, 49 ... Insulation jacket.

Claims (2)

[Claims] 1. A power transmission line is supported on a support arm of a steel tower via a support insulator, and a discharge electrode on the power supply side is supported on the power supply side of the support insulator, while a lightning protection insulator is mounted on the support arm side. In the lightning protection horn insulator device, which is provided with a grounding-side discharge electrode that supports and supports this discharger-side discharge electrode with a predetermined discharge gap on the charge-sided discharge electrode, the charge-side discharge is applied to the lightning-proof insulator or a supporting arm. A lightning protection horn insulator device provided with a blocking means for blocking an electrode from approaching a discharge electrode on the ground side. 2. The lightning protection horn insulator device according to claim 1, wherein the blocking means is composed of an insulating rod supported on a voltage-applying side of the lightning arrestor and an insulating outer jacket having a fold formed on an outer periphery thereof.