JPH0236172Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) This invention relates to a mounting bracket for a lightning horn for insulators.

(Prior art) In electrical lines, when overvoltage due to lightning surge flashes over, grounding objects such as cross arms are used to suppress and interrupt the accompanying current and prevent wire breakage and damage to the insulator due to follow-on arcs. A lightning protection horn consisting of a current limiting element unit with non-linear voltage and current characteristics and an arcing horn is attached to the lightning protection horn, which is opposed to an insulated wire held by an insulator with a discharge gap. .

Conventionally, a mounting bracket 32 as shown in FIG. 6, for example, has been used for mounting the lightning protection horn 31 for insulators. This mounting bracket 32 consists of a mounting part 33 and a support arm 34 extending upward from the mounting part 33, and a pin fitting 36 provided at the lower end of the insulator 35 is inserted into the insertion hole 33a provided in the mounting part 33. Afterwards, it is tightened and fixed with a nut 37. A current limiting element unit 38 constituting the lightning horn 31 is erected and fixed at the tip of the support arm 34, and an annular arcing horn 39 is attached to the upper part of the current limiting element unit 38 so as to surround the insulator 35. has been done. In addition, the current limiting element unit 38 is connected to the insulator 3.
In some cases, the base metal fitting 35a of No. 5 is attached via a band metal fitting or the like that holds the base metal fitting 35a.

(Problem to be Solved by the Invention) However, when the nut 37 of the insulator 35 becomes loose due to wire vibration, etc., the mounting bracket 32 tilts from its normal installation state, and the coordinates of the arcing horn 39 relative to the insulator 35 become large. As a result, the lightning surge overvoltage is not accurately captured by the arcing horn 39, and flashes directly to the grounding object such as the ring 35a, causing a follow-on arc, which can cause damage to the insulator 35, disconnection, and other disasters. Furthermore, when attaching the lightning horn 31 to an existing insulator, the nut 37 must be removed before the work is done, which makes the work cumbersome.
Further, when the salt pan 7 is attached to the insulator 2 as shown in FIG. 1, it is difficult to attach the lightning horn to the base metal 5 using a band metal fitting or the like.

This invention is a lightning-proof horn for insulators that can be easily attached to a cross arm using an insulator pin fitting without modifying existing equipment, and can properly hold the lightning-proof horn against the insulator even if the fixing nut becomes loose. This provides mounting hardware for the.

Composition of the device (means for solving the problem) In order to solve the above problem, this device has a mounting part that is attached to a grounded object such as a arm arm, and a lightning horn that extends from the mounting part to support the lightning horn. In the mounting bracket for a lightning horn for an insulator, the mounting part is provided with a fitting hole that is non-rotatably fitted to a nut to which the insulator is tightened and fixed via a pin fitting.
An insertion hole is provided in series with the fitting hole, a pin fitting is inserted through the hole, and a fixing nut is used to tighten the hole.

(Function) By adopting the above-mentioned means, this device hardly tilts from the normal mounting state even if the fixing nut of the mounting bracket becomes loose, and the coordinates of the arcing horn with respect to the insulator do not change significantly. It is possible to stably maintain the lightning protection horn's capture performance against surge overvoltage flashovers.

Further, even if the insulator has an accessory such as a salt-resistant plate, the installation work can be easily and safely performed.

(Example) Hereinafter, an example that embodies this idea will be described.
This will be explained according to Figure 4.

An insulator 2 is fastened to a pin fitting 3 by a hexagonal nut 4 on the upper surface of a cross arm 1 which is horizontally fixed to a utility pole (not shown). A support metal fitting 6 is clamped between a base metal fitting 5 fixed to the lower end of the insulator 2 and the cross arm 1. A bowl-shaped salt-resistant dish 7 is placed on the upper surface of the support metal fitting 6 so as to surround the cap 2a of the insulator 2 and the base metal fitting 5, and a plurality of clamping pieces are provided radially near the outer periphery of the support metal fitting 6. It is clamped and fixed by 6a.

An insulated wire 8 is tied to the upper part of the insulator 2 by a bind wire 9.

The lower surface of the armrest 1 has a mounting portion 11;
A mounting bracket 10 consisting of a support arm 12 extending obliquely upward from the mounting bracket 10 is fastened and fixed by a hexagonal fixing nut 13 via a washer 14. Third
As shown in the figure, the tip of the mounting portion 11 is formed by bending a plate material into two layers to form an upper plate portion 11a and a lower plate portion 11b. There are 12 recesses 1 in the upper plate part 11a.
A fitting hole 15 having a diameter 5a is provided through the recessed portion 15.
It is possible to fit every other corner of the nut 4 into the nut 4. An insertion hole 16 for inserting the pin fitting 3 is provided through the lower plate portion 11b at a position corresponding to the fitting hole 15 in series.

Reinforcing ribs 17 are formed on both side edges of the mounting bracket 10. Upper plate portion 11a of this reinforcing rib 17
A tall portion 17a is formed at a position corresponding to , and comes into contact with the lower surface of arm arm 1 . The height portion 17a is formed higher than the thickness of the nut 4.

The tip of the support arm 12 is bent outward so as to be parallel to the attachment portion 11, and an insertion hole 12a is provided in the center thereof. This support arm 1
2, a current-limiting element unit 18, which is formed by enclosing a zinc oxide element with non-linear voltage-current characteristics in a hermetically sealed manner with an insulating material, has a ground electrode 19 provided at its lower end inserted into the insertion hole 12a, and is inserted into the nut. 20 and is fixed in an upright position.

As shown in Figures 1 and 4, the current limiting element unit 1
An annular arcing horn 22 made of a metal wire is fastened to a power-supplying electrode 21 provided on the upper part of the insulator 2 with a holding fitting 24 and a screw 23 so as to surround the body of the insulator 2 . Further, a part of this arcing horn 22 is provided with an intermittent part on the opposite side of the current limiting element unit 18, and an elliptical retaining ring 25 is engaged with retaining parts 22a and 22b formed at both ends of this intermittent part. It is stopped and connects the intermittent parts of the arcing horn 22. The aforementioned current limiting element unit 18 and arcing horn 22 constitute a lightning protection horn.

Now, in this embodiment, the mounting part 1 of the mounting bracket 10 is
1 into two layers, and the upper plate part 11a
A fitting hole 15 is provided with a recess 15a into which a nut 4 to which an insulator 2 is fastened and fixed via a pin fitting 3 can be fitted.
Since this is formed, the lightning horn can be easily installed without removing the nut 4 from the existing insulator and without being restricted by accessories such as the salt pan 7, and the installation work can be saved.

Furthermore, even if the fixing nut 13 of the mounting bracket 10 becomes loose, the fitting hole 15 is fitted into the nut 4, so the mounting bracket 10 will hardly tilt from its normal installed state, and therefore the arcing horn against the insulator 2 will not tilt. The coordinates of 22 do not deviate significantly, and lightning surge overvoltage flash faults can be accurately detected, and the ability to prevent disasters such as insulator damage and disconnection can be stably maintained.

Furthermore, since the recess 15a of the fitting hole 15 is unrotatably fitted to the corner of the nut 4, the mounting bracket 10 does not rotate in the horizontal direction. The two-point support by the high portion 17a increases the frictional force between the mounting bracket 10 and arm arm 1, and therefore increases the resistance against rotational force, so even if an impact load is applied to the mounting bracket 10, the mounting bracket Hard to loosen.

Note that this invention may be implemented as shown in FIG. That is, the tip of the attachment part 11 is bent downward to form the upper plate part 11c and the lower plate part 11d,
A fitting hole 15 similar to that described above is provided in the upper plate portion 11c, and an insertion hole 16 is provided in the lower plate portion 11d. In addition, the tip of the lower plate portion 11d is bent upward to form the support leg 11.
The configuration shall be as follows. In this case, the distance between the upper surface of the upper plate portion 11c and the upper surface of the lower plate portion 11d may be made larger than the thickness of the nut 4.

Further, the mounting part 11 is formed thicker than the nut 4, a fitting hole 15 is recessed in the mounting part 11, and an insertion hole 16 for inserting the pin fitting 3 is formed in communication with the fitting hole 5. You can.

Furthermore, although the hexagonal nut 4 has been described in the above embodiment, the mounting fitting 10 may also be used for a square nut.

Further, in the above embodiment, the fitting hole 15 has a recess 15a.
However, instead of the recess 15a, for example, a hexagonal hole may be provided for a hexagonal nut so as to come into contact with the side of the nut.

Effects of the device As detailed above, this device has the advantage that even if the fixing nut of the mounting bracket becomes loose, the fitting hole provided in the mounting part is fitted with the nut that tightens and fixes the insulator in a non-rotatable manner. , the mounting bracket not only hardly tilts with respect to the insulator, but also prevents horizontal rotation, and the lightning horn does not change the coordinates of the arcing horn with respect to the insulator, so it is possible to accurately detect flashovers caused by lightning surge overvoltage, and to prevent the insulator from rotating. The ability to prevent disasters such as damage and disconnection can be stably maintained.

In addition, the lightning horn can be installed without modifying existing equipment, and there is no restriction due to attachments such as salt pans, which has the excellent effect of saving labor in installation work.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the mounted state of the mounting bracket of this invention, Fig. 2 is a plan view of the mounting bracket, Fig. 3 is a vertical sectional view of the mounting bracket, Fig. 4 is a plan view of the lightning horn, and Fig. 5 is a plan view of the mounting bracket. The figure is a sectional view of a main part showing another example, and FIG. 6 is a partial sectional view showing a conventional example. 1... Bracelet, 2... Insulator, 3... Pin fitting, 4
...Nut, 10...Mounting bracket, 11...Mounting part, 11a, 11c...Top plate part, 11b, 11d
... lower plate part, 12 ... support arm, 13 ... fixing nut, 15 ... fitting hole, 15a ... recess, 1
8... Current limiting element unit, 22... Arching horn.

Claims (1)

[Scope of claims for utility model registration] 1. Attachment part 11 attached to a grounded object such as arm arm 1
and a support arm 12 extending from the mounting part 11 to support the lightning horn. In this mounting bracket, the insulator 2 is fastened to the mounting part 11 via a pin fitting 3 with a nut 4.
A fitting hole 15 is provided in which the fitting is fitted in a non-rotatable manner, and an insertion hole 16 is provided in series with the fitting hole 15, through which the pin fitting 3 is inserted and tightened with a fixing nut 13. Lightning horn mounting bracket for insulators. 2 The tip of the mounting part 11 is made by bending the plate material into two layers, and forming upper plate parts 11a, 11c and lower plate parts 11b, 1.
1d. A mounting bracket for a lightning-proof horn for an insulator according to claim 1 of the utility model registration claim. 3 The fitting hole 15 is formed in the upper plate parts 11a, 11c, the insertion hole 16 is formed in the lower plate part 11b, 11d, and the fitting hole 15 is provided with a plurality of recesses 15a that engage each corner of the nut 4. A mounting bracket for a lightning-proof horn for insulators as set forth in claim 2 of the utility model registration claim.