JP2008193822A - Auxiliary metal fitting for transient current grounding tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique which can simplify the work by dispersing with the work, etc. for exposing a conductor lead-out rod and besides which enables the user to perform the work in condition that safety is kept surely and also which makes an auxiliary metal fitting itself into small, light and simple construction. <P>SOLUTION: This is an auxiliary metal fitting 10 for a transient current grounding tool 6 which is to be mounted on a joint J between a underground power transmission line and an overhead transmission line. It is equipped with a main body 12 which has a shank 11 that can be held by the tip holder 63a of the transient current grounding tool, a screw rod 13 which is provided at the main body, and a nut 14 which can be screwed onto the screw rod. The joint includes a conductor fixing terminal 9 which has a bolt hole 90 for attachment by a bolt and a nut to the lead-out rod 8 of the underground transmission line, and the screw rod is made in such a length as can pierce the bolt hole of the conductor fixing terminal. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an auxiliary metal fitting for a transient current grounding tool for a power transmission line that is suitable for use when mounted on a connection portion between an underground power transmission line and an overhead power transmission line.

  FIG. 10 is a schematic plan view showing an example of use of the transient current grounding tool when the jumper wire of the overhead power transmission line is opened and connected. In the same figure, 1 is a steel tower body, 2 is an arm, 2a is an insulator series, and 3 is a stop line (main line). When both ends of the stop line (main line) 3 are grounded, an electromagnetic induction current is generated by an electromagnetic induction effect induced from the charging line. A jumper wire opening grounding tool 5 is attached for the purpose of reducing the amount of this electromagnetic induction current flowing through the jumper wire 4.

  Further, when the jumper wire 4 is opened, there is no induced current path, and a large current (transient current) appears at the open end. At that time, if an operator touches the jumper wire 4, it becomes an inductive current path and an electric shock is caused. Therefore, when the jumper wire is opened and connected, a transient current is grounded between the stop line (main line) 3 and the jumper wire 4. A tool 6 is attached. The transient current grounding tool 6 includes a lead wire 61 and gripping members 62 and 63 provided at both ends thereof. The stop line (main line) 3 is gripped by the tip gripping portion 62a of one gripping member 62, and the other The jumper wire 4 is gripped by the tip gripping portion 63 a of the gripping member 63. The lead wire 61 of the transient current grounding tool 6 is shortened to reduce the resistance value.

  This transient current grounding tool 6 is supposed to be used to prevent a disaster caused by electromagnetic induction current in an overhead wire jumper opening operation of 154 kV or less, and a branch point / lead wire of the underground transmission line with the overhead transmission line It is also used when releasing. As shown in FIG. 11, the lead wire here is branched from the overhead power transmission line (main line) 3 in order to connect to the conductor lead bar 8 of the underground power transmission line via the conductor fixing terminal (connecting bracket) 9. It means that the power transmission line (lead wire) 7 is made to be. A lead wire compression terminal 72 for fastening the conductor fixing terminal 9 with a bolt 71 including a nut is provided at the end of the lead wire 7.

  When used when releasing the lead wire 7, the transient current grounding tool 6 is connected and fixed to the exposed electric wire portion of the lead wire 7 and the conductor fixing terminal 9, and the bolt 71 is loosened and opened. Due to the structure of the tip gripping portion 63a of the transient current grounding tool 6, it may be difficult to grip the conductor fixing terminal 9 depending on the size of the conductor fixing lever 9, and in that case, the tip gripping portion 63a is attached to the tape or Fix with a rope or loosen the bolt 91 as shown in the figure and raise the conductor fixing terminal 9 slightly as shown by the arrow to expose the conductor lead bar 8 and hold the tip gripping part 63a at that position to fix it. Yes.

That is, there are various types of fixed terminals by voltage, cable size, and branch form, and the sizes vary depending on the type. A relatively small fixed terminal can be gripped and fixed in the vicinity of the gripping portion of the transient current grounding tool 6, but the tip gripping portion 63a sufficiently holds the conductor fixed terminal 9 in a fixed terminal of a certain size or larger. In some cases, it could not be pinched and could not be gripped or fixed. In that case, as described above, it is fixed with tape or rope, or the bolt 91 of the conductor fixing terminal 9 is loosened so that the conductor lead bar 8 is exposed, and then the tip gripping portion 63a is held and fixed to the exposed portion. It was. In the figure, 8a indicates an insulator.
JP 2006-196396 A

  However, in the former method in which the conductor fixing terminal 9 is sandwiched by the tip gripping portion 63a, there are cases where reliable contact and gripping may not be possible, and assistance such as support by hand is required, which may lead to an unstable state. The Further, in the latter method of loosening the bolt 91 of the conductor fixing terminal (connection fitting) 9 to expose the conductor lead bar 8, it is conceivable that the conductor fixing terminal 9 may come off depending on the force. There is a risk of causing a disaster due to electromagnetic induction current.

  Therefore, the present invention exposes the conductor lead bar as in the prior art by making it possible to attach the auxiliary metal fittings using bolt holes and bolts provided in the connection portion of the underground power transmission line and the overhead power transmission line. In addition to simplifying the work by eliminating the need for work, etc., it is possible to work in a state where safety is reliably maintained, and the auxiliary metal fitting itself is also small, light and simple in construction. The challenge is to provide technology that can do this.

In order to solve the above-mentioned problems, the present invention employs the following means.
The present invention is an auxiliary metal fitting for a transient current grounding tool attached to a connection portion between an underground power transmission line and an overhead power transmission line, and a main body having a shaft portion that can be gripped by a tip gripping portion of the transient current grounding tool And a screw rod portion provided in the main body portion, and a nut that can be screwed into the screw rod portion, and the connecting portion is for attaching to the conductor lead rod of the underground power transmission line with a bolt and a nut. Including a conductor fixing terminal having a bolt hole, the screw rod portion is formed to have a length that can penetrate the bolt hole of the conductor fixing terminal.

  According to the auxiliary metal fitting of the present invention, since the screw rod portion having a length that can penetrate the bolt hole of the conductor fixing terminal is provided in the main body portion, the screw rod portion is inserted into the bolt hole of the conductor fixing terminal and tightened with the nut. Thus, the auxiliary metal fitting can be attached and fixed to the conductor fixing terminal. Furthermore, since this main body portion is provided with a shaft portion that can be gripped by the grip portion of the transient current grounding tool, reliable contact and gripping (electrical connection) can be performed. Thereby, safety and workability can be improved.

  Here, it is preferable that a flange is provided at an end portion of the main body portion opposite to the screw rod portion. If comprised in this way, a flange can be functioned as a retaining with respect to the front-end | tip holding part of the transient current grounding tool which hold | grips a shaft part.

  The present invention is an auxiliary metal fitting for a transient current grounding tool attached to a connection portion between an underground power transmission line and an overhead power transmission line, and a main body having a shaft portion that can be gripped by a tip gripping portion of the transient current grounding tool And a screw hole portion provided in the main body, wherein the connecting portion includes a conductor fixing terminal having a bolt hole to be attached to a conductor lead bar of the underground power transmission line by a bolt and a nut, and the screw The hole portion is formed by a female screw that can be screwed into a bolt that attaches the conductor fixing terminal to the conductor lead bar.

  According to the auxiliary metal fitting of the present invention, since the conductor fixing terminal has the screw hole portion formed in the female screw that can be screwed to the bolt attached to the conductor lead bar, the screw hole portion is used as the conductor fixing terminal. It is possible to attach and fix the auxiliary metal fitting to the conductor fixing terminal simply by screwing on and tightening the bolt. Furthermore, since this main body is provided with a shaft portion that can be gripped by the tip gripping portion of the transient current grounding tool, reliable contact and gripping (electrical connection) can be performed. Thereby, safety and workability can be improved.

In the present invention, it is preferable that the main body portion is provided with a through hole into which an operation rod for rotating the main body portion around its axis can be inserted. When comprised in this way, operation which inserts an operation stick | rod in a through-hole and rotates a main-body part around an axis | shaft can be performed simply. Thereby, even if tools, such as a spanner, are not used, attachment and removal work of an auxiliary metal fitting can be performed easily.

  In the present invention, it is preferable that the main body portion is formed in a hollow cylindrical shape, the screw hole portion is provided on one end side thereof, and the flange is provided on the other end side. When configured in this way, the auxiliary metal fitting itself can be made small, light and simple, and the flange can function as a retainer for the tip gripping part of the transient current grounding tool that grips the shaft part. Can do.

  According to the present invention, the auxiliary metal fittings can be attached using the bolt holes and bolts provided in the connection portion between the underground power transmission line and the overhead power transmission line, so that the conductor lead bar can be exposed as in the prior art. Not only can the work be simplified, the work can be simplified, the work can be performed in a state where safety is reliably maintained, and the auxiliary metal fitting itself is also small, light and simple. be able to.

  Preferred embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, the same components as those in FIGS. 10 and 11 shown in the conventional example are denoted by the same reference numerals.

  FIG. 1 is a perspective view showing an example of use of an auxiliary metal fitting for a transient current grounding tool according to Embodiment 1 of the present invention. FIG. 2 is a perspective view of the auxiliary metal fitting according to the first embodiment. 3-7 is a figure which shows the operation | work process at the time of the lead wire open | release using a transient current grounding tool and an auxiliary metal fitting.

  As shown in these drawings, the auxiliary metal fitting 10 of the transient current grounding tool 6 includes a main body part 12 having a shaft portion 11 that can be gripped by a tip gripping part 63a of the transient current grounding tool 6, and one end of the main body part 12. A screw rod portion 13 provided coaxially with the main body portion 12 on the side, a nut 14 that can be screwed into the screw rod portion 13, and a flange 15 provided on the other end side of the main body portion 12 are provided.

  The auxiliary metal fitting 10 is used by being attached to a connection portion J between the underground power transmission line and the overhead power transmission line. The connecting portion J includes a conductor fixing terminal 9 having a bolt hole 90 for attaching to the conductor lead bar 8 of the underground power transmission line by a bolt 91 and a nut 95, and a lead wire compression terminal provided at an end of the lead wire 7. 72, and the auxiliary metal fitting 10 is mounted on the conductor fixing terminal 9 side. Accordingly, the screw rod portion 13 is formed to have a length that can penetrate the bolt hole 90 of the conductor fixing terminal 9. The conductor fixing terminal 9 and the lead wire compression terminal 72 are both made of a good conductor such as copper or aluminum.

  The conductor fixing terminal 9 includes fittings 92 and 93 for sandwiching the conductor lead bar 8 and a joining plate 94 formed on the upper part of the fitting 93. The joining plate 94 is formed in substantially the same outline as the lead wire compression terminal 72 and has a bolt hole into which the bolt 71 can be inserted. Therefore, when the lead wire 7 is released, the lead wire compression terminal 72 is opened between the joining plate 94 (see FIG. 7).

The main body 12 of the auxiliary metal fitting 10 is provided with an operation rod 16 (see FIG. 5) for rotating the main body 12 about its axis and a through hole 17 into which a driver D can be inserted. Further, a nut portion 18 for rotating the main body portion 12 using a spanner S or the like is provided on the screw rod portion 13 side of the main body portion 12. The nut portion 18 is attached to the main body portion 12 and the screw rod portion 13 by being prevented from rotating by welding or the like. The nut portion 18 can be formed integrally with the main body portion 12, but it is preferable to use a commercially available one in terms of production cost.

  The auxiliary metal fitting 10 is provided with the flange 15 so that the tip end gripping portion 63a of the transient current grounding tool 6 that grips the shaft portion 11 functions as a retaining member, and the flange 15 is gripped to rotate around the shaft. It is designed so that it can also be used as a function. In order to facilitate the operation of gripping and rotating the flange 15, a plurality (four places) of finger-fitting recesses 15 a are provided on the peripheral edge of the flange 15 at intervals.

  Further, a through-hole 15b for hooking a fall prevention hook attached to a tool such as the operation rod 16 or the spanner S or tying a string is provided at the peripheral portion of the flange 15.

  The auxiliary metal fitting 10 itself is made of a metal having excellent conductivity such as copper or aluminum. Therefore, in the state where the auxiliary metal fitting 10 is screwed and attached to the conductor fixing terminal 9, both are considered to be electrically connected as good conductors.

  When this auxiliary metal fitting 10 is used, as shown in FIG. 3, only one bolt 91 and nut 95 of the conductor fixing terminal 9 are removed, and then the screw rod portion of the auxiliary metal fitting 10 is shown in FIG. 13 is inserted into the bolt hole 90, and the nut 14 is screwed from the opposite side and tightened. Instead of the nut 14, the nut 95 used for tightening the bolt 91 may be used.

  In the tightening operation of the auxiliary metal fitting 10, a spanner S may be used as shown in FIG. 5A, or an operation rod 16 or a driver D is used as shown in FIG. 5B. Also good. In this way, the operation rod 16 and the driver D can be inserted into the through hole 17 and the operation of rotating the main body 12 about the axis can be easily performed. Thereby, even if tools, such as a spanner S, are not used, the attachment and removal operation | work of the auxiliary metal fitting 10 can be performed easily.

  When the attachment work of the auxiliary metal fitting 10 is finished, as shown in FIG. 6, the lead wire 7 is gripped by the tip gripping portion 62a of one gripping member 62 of the transient current grounding tool 6, and the tip gripping portion of the other gripping member 63 is secured. The shaft portion 11 of the auxiliary metal fitting 10 is gripped by 63a. Thereby, the transient current grounding tool 6 can be mounted in a reliable state.

  When the mounting of the transient current grounding tool 6 is finished, the lead wire 7 can be safely released by removing all the bolts 71 (six in the figure) in that state (see FIG. 7).

  FIG. 8 is a perspective view of an auxiliary metal fitting showing Embodiment 2 of the present invention. In the second embodiment, components that are basically the same as those in the first embodiment are denoted by the same reference numerals and description thereof is simplified.

  The auxiliary metal fitting 10 of this embodiment includes a main body portion 12 having a shaft portion 11 that can be gripped by the tip gripping portion 63a of the transient current grounding tool 6, and a screw hole portion 121 provided in the main body portion 12. . The screw hole portion 121 is formed as a female screw that can be screwed into a bolt 91 that attaches the conductor fixing terminal 9 to the conductor lead bar 8.

  The main body portion 12 is formed in a hollow cylindrical shape, and a screw hole portion 121 is provided on one end side thereof, and a flange 15 is provided on the other end side. A nut 18 is welded to the end of the main body 12, and a screw hole 121 is formed by the nut 18.

  The auxiliary metal fitting 10 of this embodiment has the screw hole portion 121 formed in the female screw that can be screwed into the bolt 91 that attaches the conductor fixing terminal 9 to the conductor lead bar 8. The auxiliary metal fitting 10 can be attached and fixed to the conductor fixing terminal 9 simply by screwing the hole portion 121 into the bolt 91 of the conductor fixing terminal 9 and tightening it.

  Furthermore, since the shaft portion 11 that can be gripped by the tip gripping portion 63a of the transient current grounding tool 6 is provided in the main body portion 12, reliable contact and gripping (electrical connection) can be performed. Thereby, safety and workability can be improved. In this embodiment, the auxiliary metal fitting 10 itself can be made smaller, lighter and simpler.

  In addition, as this auxiliary | assistant metal fitting 10, as shown in FIG. 9, it can also be comprised with the volt | bolt with the head 123 which provided the positioning nut 122, for example. In this case, as in the first embodiment, the male screw 124 portion is inserted into the bolt hole 90 and tightened with the nut 14 for mounting. Then, the shaft portion 11 is gripped by the tip gripping portion 63 a of the transient current grounding tool 6. In this embodiment, there is an advantage that it can be provided at a particularly low cost.

It is a perspective view which shows the usage example of the auxiliary metal fitting of the transient current grounding tool which concerns on Example 1 of this invention. It is a perspective view which shows the auxiliary metal fitting which concerns on Example 1 of this invention. It is a figure which shows the operation | work process at the time of the lead wire open | release using the transient current grounding tool and auxiliary | assistant metal fitting which concern on Example 1 of this invention. It is a figure which shows the operation | work process at the time of the lead wire open | release which concerns on Example 1 of this invention. It is a figure which shows the operation | work process at the time of the lead wire open | release which concerns on Example 1 of this invention. It is a figure which shows the operation | work process at the time of the lead wire open | release which concerns on Example 1 of this invention. It is a figure which shows the operation | work process at the time of the lead wire open | release which concerns on Example 1 of this invention. It is a perspective view which shows the auxiliary metal fitting which concerns on Example 2 of this invention. It is a perspective view which shows the auxiliary metal fitting which concerns on Example 3 of this invention. It is a top view which shows the usage example of the transient current grounding tool in an overhead power transmission line. It is a perspective view which shows the usage example with which the conventional transient current grounding tool is assumed.

Explanation of symbols

1 Steel tower body 3 Stop line (overhead transmission line)
4 Jumper wire 6 Transient current grounding tool 61 Lead wires 62, 63 Holding members 62a, 63a Tip gripping portion 7 Lead wire 71 Bolt 72 Lead wire compression terminal 8 Conductor lead bar 9 Conductor fixing terminal 90 Bolt hole 91 Bolt 10 Auxiliary metal fitting 11 Axis Portion 12 Body portion 13 Screw rod portion 14 Nut 15 Flange 16 Operation rod 17 Through hole

Claims (5)

An auxiliary metal fitting for a transient current grounding tool attached to a connection portion of an underground power transmission line with an overhead power transmission line,
A main body having a shaft portion that can be gripped by a tip gripping portion of the transient current grounding tool, a screw rod portion provided in the main body portion, and a nut that can be screwed into the screw rod portion;
The connection part includes a conductor fixing terminal having a bolt hole for attaching with a bolt and nut to a conductor lead bar of the underground power transmission line,
The screw rod portion is an auxiliary metal fitting for a transient current grounding tool formed to have a length that can penetrate the bolt hole of the conductor fixing terminal.   The auxiliary metal fitting for a transient current grounding tool according to claim 1, wherein a flange is provided at an end portion of the main body portion opposite to the screw rod portion. An auxiliary metal fitting for a transient current grounding tool attached to a connection portion of an underground power transmission line with an overhead power transmission line,
A main body having a shaft portion that can be gripped by the tip gripping portion of the transient current grounding tool, and a screw hole portion provided in the main body,
The connection part includes a conductor fixing terminal having a bolt hole for attaching with a bolt and nut to a conductor lead bar of the underground power transmission line,
The screw hole portion is an auxiliary metal fitting for a transient current grounding tool formed on a female screw that can be screwed onto a bolt that attaches the conductor fixing terminal to a conductor lead bar.   The auxiliary metal fitting for a transient current grounding tool according to any one of claims 1 to 3, wherein the main body portion is provided with a through-hole into which an operation rod for rotating the main body portion about an axis can be inserted. .   The auxiliary metal fitting for a transient current grounding tool according to claim 3, wherein the main body is formed in a hollow cylindrical shape, the screw hole portion is provided at one end thereof, and the flange is provided at the other end.

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