JP2001231117A - Grounded metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grounded metal that may be formed of the minimized amount of material, hold an arc characteristic of an arc horn, improve the working efficiency and surely hold and fix a holding metal in which the ground line is connected. SOLUTION: A grounded metal 6 is allocated at the intermediate part between an insulator 1 of the insulator coupling end in the power transmission line and the insulator 1. Moreover, the insulator coupling end is provided with an arc horn fitting metal 3, a base metal 7 for joining the grounded metal 6 is fixed to the fitting metal 3 using a bolt 5 for tightening the arc horn 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grounded metal fitting to which a ground wire is attached in order to prevent an obstacle to a worker at the time of overhead wiring work.

[0002]

2. Description of the Related Art In an overhead power transmission line, when a transmission line is replaced or repaired, an induced voltage may be generated in the working transmission line due to induction from an adjacent live transmission line. Therefore, the operator is grounded to prevent a failure due to the induced voltage. The grounding is performed by connecting one end of the ground wire to a metal fitting (metal to be grounded) attached to a connecting portion between the transmission line and the insulator string, and fixing the other end to a steel tower.

As a grounding tool, there is, for example, a tool described in Japanese Utility Model Publication No. 7-47929. This discloses a grounding tool used when feeding a grounding wire from a tower side to a transmission line side, and an operation rod connected to the grounding wire is locked to a gantry that slides over a series of insulators, and a grounding wire is provided. Is hooked on the grounded metal fitting on the transmission line side. The operation rod has a movable holding metal fitting to which one end of a ground wire is attached at its tip, and grounds by holding a grounded metal fitting fixed to the transmission line side with the holding metal fitting. The gripping metal includes a movable part and a fixed part. The metal part to be grounded is sandwiched by the movable part, and in this state, the operating rod is turned to close the movable part and grip the metal part to be grounded. The grounded metal fitting is of a gate type, and is fixed to a metal fitting that connects the power transmission line and the insulator string to the insulator string located at both ends of the plurality of insulator strings. The gantry has a plurality of shoe members at its tip, which are curved to the opposite side of the insulator series and slide in the axial direction on the insulator series, and the coupling member and the shoe member engage with the insulator via the shoe member. And a support member for supporting the member.

[0004] In this grounding method using a grounding tool, an operating rod is locked to a gantry at a position close to a gripping metal, and a shoe member of the gantry is placed on a series of insulators. Then, pull out the operating rod from the tower side, slide the shoe member on the insulator line in the axial direction,
It is sent to the end of the insulator chain (transmission line side). When reaching the tip, the operating rod is operated so that the grounded metal fitting at that position is sandwiched between the gripping metal fittings. At this time, since the operation rod is locked at the center of the support member of the gantry, the grounding wire is located near the intermediate portion between the insulators. Here, since the grounding wire is fixed to the steel tower in advance, the transmission line on which the above-described operation has been performed is grounded. After the work, remove the ground in the reverse order.

[0005] By grounding as described above, the induced voltage generated in the grounded transmission line can be reduced to a level that has substantially no effect even if the nearby transmission line is in a live state. The worker can work in a safe state.

[0006]

However, the portal-type grounded metal fitting has the following problems. The gate-type grounded metal fittings have many components other than the gripping parts, and the material is necessary for that, and the cost is high. It tends to be large because of the portal shape. In the gate-shaped configuration, there is a possibility that corona discharge may occur because the protrusion protrudes outside the outer periphery of the arc horn, and the arc inducing function of the arc horn may be impaired. Since the arc horn and the metal fitting to be grounded are separately attached to the connecting portion between the transmission line and the insulator series, workability is poor.

[0007] In order to solve the above-mentioned problems, the present invention can maintain the arc characteristics of the arc horn with a minimum amount of material, improve workability, and reliably provide a gripping metal to which a ground wire is connected. An object of the present invention is to provide a grounded metal fitting that can be gripped and fixed.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a grounded metal fitting for grounding a transmission line stretched over a steel tower via a plurality of insulator series, wherein the grounded metal fitting is connected to an insulator connecting end on a transmission line side. It is characterized in that it is arranged in the middle part between the insulators. Further, it is preferable that an arc horn mounting bracket for fastening the arc horn with bolts is provided at the insulator connecting end, and the grounded metal bracket is preferably mounted using this bolt position in order to reduce the number of working steps. Further, it is preferable that the grounded metal fitting includes a linear rod part and a spherical part integrally formed at one end thereof so as to easily lock the grip metal part. This requires minimal material. Further, since the tip is spherical, the electric field does not concentrate and corona does not occur. In addition, it is preferable that the spherical portion of the grounded metal fitting does not protrude outside the outer periphery of the arc horn, that is, is located on the inner periphery of the arc horn so as not to hinder the arcing function of the adjacent arc horn.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below. FIG. 1 is a top view showing a state where the grounded metal fitting of the present invention is attached to a connection portion between a transmission line and an insulator series in a double-series insulator series, and FIG. 2 is a side view thereof. In the figure,
Parts denoted by the same reference numerals represent the same items. A feature of the present invention is that a grounded metal fitting 6 is attached to an intermediate portion between the insulators 1 as shown in FIG. In addition, a bolt 5 for stopping the arc horn 2 is used to fix the base metal 7 which is a metal fitting for the metal fitting 6 to be grounded. Hereinafter, this point will be mainly described.

As shown in FIG. 1, the connecting portion between the transmission line and the insulator string is composed of an insulator 1, an arc horn 2, an arc horn mounting bracket 3, a yoke 4, a retaining clamp (not shown),
And a transmission line (not shown) are connected in the line direction. The insulator 1 at the end of the insulator has an arc horn mounting bracket 3, and the arc horn 2 is fixed to the mounting bracket 3 by tightening bolts 5.

The grounded metal fitting 6 of the present invention has a plurality of insulator series and is disposed at an intermediate portion between the insulators 1 located at the extreme ends thereof on the transmission line side. The structure of the grounded metal fitting 6 is as follows.
A rod portion 6a having a straight central portion, a spherical portion 6b having a protruding tip, and a foot portion (not shown) for fixing the other end to a base metal 7 serving as a joint fitting with a bolt 8 are provided. It is formed integrally. At this time, the arrangement direction of the grounded metal fitting 6 is set so that the rod portion 6a is substantially perpendicular to a plane including the line axis of the two insulators. The entire length of the linear grounded metal fitting 6 does not protrude from the outer periphery of the arc horn 2 so as not to impair the arcing function of the adjacent arc horn 2. The spherical portion 6b at the tip may be colored so as to be easily recognized.

The shape of the base metal 7 is the shape of the arc horn mounting bracket 3.
And a bridge portion extending from the fixed portion 7b to position the grounded metal fitting 6 at an intermediate portion between the insulator 1 and the insulator 1.
7a is a bent rod-shaped member integrated with the same. The base metal 7 is fixed to the upper surface of the mounting bracket 3 with the bolt 5. Here, the entire arc horn 2 is a semicircular metal rod that extends from the mounting position at one end to below the insulator 1, extends around the outer periphery of the insulator 1, and reaches above the insulator 1. One end (fixed end) is welded to a mounting plate (not shown) fixed to the lower surface of the mounting bracket 3 with bolts 5, and the other end is a free end located above the insulator 1. Therefore, the spherical portion 6b of the metal fitting 6 to be grounded is located below the free end of the arc horn 2. Further, the fixing portion 7b and the fixed end of the arc horn 2 are configured to face each other via the mounting bracket 3.

At this time, not only the bolts 5 for fixing the arc horn 2 but also the bolts 9 for stopping the yoke 4 and the bolts for stopping the insulator 1 at the extreme end of the insulator series are provided at the connection between the transmission line and the insulator series. There are also ten. However, these bolts 9/10
Is under tension and cannot be easily removed. Also, due to the tension, it is difficult to retrofit the base metal 7 to an existing overhead transmission line. Therefore, it is preferable to fix with a bolt 5 which is not under tension.

By installing the grounded metal fitting 6 at an intermediate portion between the insulators 1 and 2, the grounded metal fitting of the present invention can reliably hold the gripping metal only by sliding the operation rod, to which the gantry is attached, on the series of insulators. To the metal fitting 6 to be grounded.
Further, since the base metal 7 of the metal fitting 6 to be grounded is simultaneously attached with the bolts 5 for fixing the arc horn 2, the number of working steps can be reduced.

The mounting structure of the grounded metal fitting according to the present invention may be configured as follows according to the number of the insulator series. In the above description, the example of the double-type insulator series is used.
In the case of a continuous type, the above-mentioned 2
What is necessary is just to comprise like a continuous type. In the case of the quadruple type, the configuration may be the same as that of the above-described two-line type for each two parallel lines.

The grounded metal fitting of the present invention is not limited to the above-described example, but may be variously modified without departing from the gist of the present invention.

[0017]

As described above, according to the grounded metal fitting of the present invention, since the grounded metal fitting is located at the intermediate portion between the insulators at the end of the insulator connection, the operation rod to which the gantry is attached is mounted on the insulator. It is possible to obtain an excellent effect that the gripping metal can surely catch and grip the metal fitting to be grounded simply by sliding in the sliding direction. Also,
Since the base metal for fixing the grounded metal fitting of the present invention is fixed to the arc horn mounting bracket with bolts for fixing the arc horn, the base metal is also mounted at the same time as the arc horn is stopped, so that the number of work steps can be reduced and workability is improved. it can. Further, by making the outer shape of the grounded metal fitting of the present invention a linear shape, the material can be reduced and the cost is high.

[Brief description of the drawings]

FIG. 1 is a top view in which a grounded metal fitting according to the present invention is attached to a connecting portion between a transmission line and an insulator series in a double-series insulator series.

FIG. 2 is a side view in which the grounded metal fitting of the present invention is attached to a connecting portion between a transmission line and an insulator series in a double insulator series.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Insulator 2 Arc horn 3 Arc horn mounting bracket 4 Yoke 5 Bolt 6 Grounding bracket 6a Rod 6b Spherical part
7 Base 7a Bridge 7b Fixed part 8 Bolt 9 ・ 10 Bolt

Claims (4)

[Claims] 1. A grounded metal fitting for grounding a transmission line stretched on a tower via a plurality of insulator series, wherein the grounded metal fitting is provided at an intermediate portion between the insulator at the end of the insulator connecting end on the transmission line side. A metal fitting to be grounded, which is arranged. 2. An arc horn mounting bracket for fastening an arc horn with bolts at a continuous end portion of the insulator, wherein the grounded bracket is mounted using the bolt position. Grounded metal fittings. 3. The grounded fitting according to claim 2, wherein the grounded fitting comprises a linear rod portion and a spherical portion integrally formed at one end thereof. 4. The grounded fitting according to claim 2, wherein the spherical portion of the grounded fitting does not protrude outward from the arc horn.