JP2983646B2 - Lightning insulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to prevent a permanent ground fault by immediately discharging an abnormally large current due to an electric shock to a transmission line to the ground by means of a lightning arrester function and blocking a continuation flow. And a lightning arrester device.

[0002]

2. Description of the Related Art Conventionally, a lightning arrester insulator for a transmission line has a lightning arrester suspended and fixed to a supporting arm of a steel tower by a mounting adapter, and a horn provided at a lower end of the lightning arrester has a horn. A discharge electrode on the power supply side, which is also made of a horn-shaped steel material, is supported on the transmission line side, for example, a wire suspension metal fitting, and a commercial frequency is provided between both discharge electrodes. An aerial discharge interval set to an insulation strength to withstand a voltage and a switching surge voltage is formed. Then, when a lightning surge enters the power transmission line, the surge current flashes the air discharge interval, and the voltage-current characteristics housed inside the lightning arrester flow through the current-limiting element having a non-linear characteristic. And a voltage applied to the juxtaposed insulator devices is suppressed to a level that does not cause flashover. This prevents a ground fault from occurring.

The discharge electrode on the power-applying side is generally formed entirely of steel and is cantilevered by a hanging metal fitting. For example, for a voltage class of 154 to 187 kv, the length is 1.5 m. The diameter was about 34 mm, which was as large as about 1.8 m, and the weight was about 6 to 7 kg, which was relatively large. If the discharge electrode becomes longer and heavier, the discharge electrode is more likely to vibrate due to its own inertia when receiving its own weight or electric wire vibration. In order to prevent this inconvenience, a balance weight is provided at a position opposite to the discharge electrode with respect to the electric wire suspension fitting to maintain balance with respect to gravity.

[0004]

However, the balance weight is suitable for maintaining a vertical weight balance. Therefore, when the discharge electrode receives a horizontal wind pressure load, the torsion moment on the discharge electrode side is generally larger than that on the balance weight side, so that the discharge electrode irregularly fluctuates due to the wind pressure and the discharge gap is increased. There is a problem that cannot be kept constant. Further, there is also a problem that a load is applied to a hanging metal fitting for mounting and supporting the discharge electrode when the discharge electrode is about to be twisted by wind pressure, and the hanging metal fitting may be damaged in some cases.
Further, in order to solve these problems, a part of the discharge electrode may be connected and supported to the transmission line by an extendable support member, but the structure is complicated by a mechanism for expansion and contraction. I will.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has an object of simplifying the structure, preventing the discharge electrode on the transmission line side from being shaken by wind pressure, and reducing the discharge interval. It is an object of the present invention to provide a lightning arrester device that can prevent the discharge electrode from being twisted and prevent the discharge electrode from being twisted, so that the metal fitting for mounting and supporting the discharge electrode can be prevented from being damaged.

[0006]

According to a first aspect of the present invention, a suspension insulator is suspended from a supporting arm of a steel tower, and a lower suspension bracket is attached to a lower end of the suspension insulator. The power transmission line is supported through the lower arm and the lower electrode is connected to the discharge electrode on the power application side. On the other hand, the lightning insulator is supported on the supporting arm side via a mounting adapter, and the lower end of the lightning insulator is supported. A discharge electrode on the ground side is attached to the portion, and a predetermined discharge interval is provided between the discharge electrode on the power receiving side and the discharge electrode on the power receiving side. A wind receiving surface acting to cancel the torsional moment applied to the discharge electrode on the power application side due to the wind pressure inside is provided.

Further, in the second invention, a balance weight is provided on the opposite side of the power receiving side via the connection portion of the discharge electrode, and the wind receiving surface is provided at or near the balance weight.

[0008]

Therefore, according to the present invention, even if a wind pressure load in a horizontal plane is applied to the discharge electrode and the wind receiving surface, the torsional moments acting on the discharge electrode and the wind receiving surface cancel each other, and the discharge electrode swings. No twisting or twisting.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the lightning arrester device is suspended from the lower surface of the distal end of a support arm 1 and is composed of a plurality of suspension insulators 2 a that support a transmission line 3. And a lightning arrester 4 attached to the main body.

That is, the hanging bracket 6 is attached to the support arm 1.
Is fixed, and a U clevis 7 is rotatably connected to the hanging bracket 6. An upper horn mounting bracket 8 is connected to the U clevis 7 so as to be rotatable in the track direction (the left-right direction in FIG. 1). A suspended insulator 2 is connected and suspended so as to be rotatable in a line direction and a direction orthogonal thereto. Therefore, the hanging bracket 6, the U clevis 7,
The upper horn mounting bracket 8, the right-angle clevis link 11 and the pole clevis 13 constitute an upper suspension bracket K1.

A lower horn mounting bracket 15 is connected to the lower portion of the suspension insulator 2 via a socket clevis 14 so as to be relatively rotatable in the line direction, and a center of the lower horn mounting bracket 15 is connected via a connecting link 18. The horn mounting bracket 20 is connected. A suspension clamp 21 that supports the power transmission line 3 is connected to a lower portion of the horn mounting bracket 20 so as to be relatively rotatable in a line direction. Therefore, the socket clevis 14, the lower horn mounting bracket 15, the connecting link 18, the horn mounting bracket 20, and the suspension clamp 21 constitute a lower hanging bracket K2.

A mounting arm 23 is mounted on the lower surface of the distal end of the support arm 1 in the line direction together with the hanging bracket 6, and a mounting plate 25 is mounted on the distal end thereof, thereby forming a mounting adapter AD. . Mounting plate 25
The lightning arrester 4 is fixed in a vertical state to the lower surface. An arc horn 27 on the ground side is attached to the lower electrode 4a of the lightning arrester 4. Further, a pair of arcing rings 28a and 28b are provided on the mounting plate 25 and the lower electrode 4a above and below the lightning arrester 4 so as to surround the lightning arrester 4, and an arc jet is emitted from the lightning arrester 4 by a lightning surge. The transition is quick.

The upper horn fitting 8 has a pair of arc horns 3 for preventing damage to the hanging insulator 2 at the time of creeping along the surface.
3 is fixed. The arc horn 36 is fixed to the lower horn mounting bracket 15, and the arc horn 33 is
And at a predetermined air discharge interval. An arc horn 37 is fixed to the upper horn mounting bracket 8, and is spaced apart from the arcing ring 28b of the lightning arrester 4 by a predetermined distance. An arcing ring 39 is fixed to the lower horn mounting bracket 15, and the arc horn 2 of the lightning arrester 4 is fixed.
7 and a predetermined distance.

On the other hand, an arc horn 29 on the power application side extending in the line direction is attached to the right side of the horn mounting bracket 20 with a bolt 30, and a semicircular discharge portion 29a provided at the tip thereof is provided with the lightning arrester. It faces the arc horn 27 of the insulator 4 with a predetermined air discharge interval G. The air discharge interval G is the commercial frequency, the distance at which no discharge occurs between the arc horn 27 and the discharge portion 29a of the arc horn 29 due to the switching surge voltage, and the insulation strength of the air discharge interval G depends on the suspension insulator 2. Is set with a margin at an intermediate position with a distance that does not exceed the insulation strength.

A balance weight 31 and a wind receiving plate 45 are mounted on the left side of the horn mounting bracket 20 for mounting and supporting the arc horn 29. The balance weight 31 cancels a vertical moment due to the weight of the arc horn 29. . In addition, the wind receiving plate 45 receives the wind pressure, and the horizontal moment generated in the arc horn 29 by the wind pressure is canceled. That is, as shown in FIG. 2, the substrate 41 is fixed to the horn mounting bracket 20 with the bolts 32, and a plurality of weight plates 42 are provided on the front and rear surfaces thereof, and one of the weight plates 42 having an area larger than the weight plates 42 The two weight plates are overlapped and fixed by bolts 43. The weight plate having a large area serves as the wind receiving plate 45, and the surface thereof is the wind receiving surface 4.
It is 4.

The area of the wind receiving surface 44 is determined by the horizontal moment of the balance weight 31 when the balance weight 31 receives the wind pressure load, and the horizontal moment of the arc horn 29 when the arc horn 29 receives the wind pressure load. The moment in the direction is set to be the same. The operation of the lightning arrester configured as described above will be described.

When a lightning surge enters the power transmission line 3, the surge current flows through the lower suspension fitting K2 to the arc horn 29, and then flashes over the air discharge interval G to cause the lower discharge electrode 4 to flash.
a to the current limiting element (not shown) inside the lightning arrester 4,
It flows to the support arm 1 via the mounting adapter AD and is discharged. The subsequent flow caused by the commercial frequency is suppressed and cut off by the current limiting element and the air discharge interval G.

In the embodiment of the present invention, since the balance weight 31 is provided with the wind receiving surface 44, even if a wind pressure load acts on the arc horn 29, the wind pressure is similarly applied to the wind receiving surface 44 of the balance weight 31. The load acts, and the horizontal moments of the arc horn 29 and the balance weight 31 are substantially the same and in opposite directions. As a result, the moving forces due to the wind pressure acting on both cancel each other, so that the arc horn 29 swings. No twisting or twisting. Therefore, the arc horn 29 is always kept at a fixed position, and the distance of the air discharge interval G can be kept constant.
There is no possibility that the horn mounting bracket 20 for mounting and supporting the arc horn 29 may be damaged due to a load.
Mechanical reliability can be improved. In addition, the structure is simple because the area of one weight plate is simply increased and the air receiving plate 45 is used.

The present invention is not limited to the above-described embodiment, but can be embodied as follows. (A) As shown in FIG. 3, compared with the above embodiment,
The wind receiving plate 45 forming the wind receiving surface 44 is replaced with another weight plate 42.
And attaching it to the tip of the substrate 41 with the bolt 46 without overlapping. (B) As shown in FIG. 4, the substrate 41 itself is formed to be long to form the balance weight 31, and the surface thereof is used as the wind receiving surface. (C) As shown in FIG. 5, the air receiving plate 45 shown in (a) is bent so as not to interfere with the transmission line 3 located below the air receiving plate 45.

[0020]

As described in detail above, according to the present invention, the structure is simple, and the discharge electrode on the transmission line side is prevented from swaying due to wind pressure, thereby preventing the discharge interval from changing. , Preventing twisting of the discharge electrode, eliminating the risk of damage to the metal fittings for mounting and supporting the discharge electrode,
It has an excellent effect of improving mechanical reliability.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the entire lightning arrester insulator embodying the present invention.

FIG. 2 is a perspective view of a balance weight.

FIG. 3 is a perspective view of another example of a balance weight.

FIG. 4 is a perspective view of another example of a balance weight.

FIG. 5 is a plan view of another example of a balance weight.

[Explanation of symbols]

Support arm 1, suspension insulator 2, transmission line 3, lightning arrester 4, arc horn (discharge electrode on ground side) 27, arc horn (discharge electrode on power application side) 29, balance weight 31, wind receiving surface 44, lower part Hanging bracket K2, mounting adapter AD, discharge interval G.

Claims (2)

(57) [Claims] 1. A suspension insulator (2) is suspended from a support arm (1) of a tower, and a transmission line (3) is connected to a lower end of the suspension insulator (2) via a lower suspension bracket (K2). ), And the lower suspension bracket (K2) is connected to the discharge electrode (29) on the power application side, while the support arm (1) is connected to a lightning arrester (A) via a mounting adapter (AD). 4), a discharge electrode (27) on the ground side is attached to the lower end of the lightning arrester (4), and a predetermined discharge interval (29) is provided between the discharge electrode (29) and the discharge electrode (29) on the power receiving side. G) is provided, and acts on the opposite side of the power receiving side discharge electrode (29) via the connection portion so as to cancel the torsional moment applied to the power receiving side discharge electrode (29) by the wind pressure in the horizontal plane. A lightning arrester having a wind receiving surface (44). 2. A balance weight (31) is provided on the opposite side of the power receiving side of the discharge electrode (29) via a connection portion, and a wind receiving surface (44) is provided on or near the balance weight (31). The lightning arrester according to claim 1.