JP2006340457A - Operation insulating rod for short-circuiting/earthing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate installation work of a short-circuiting/earthing device by providing a removable operation insulating rod which is used when the electric path side connector of the short-circuiting/earthing device is installed and suitable for securing the electric path side connector which can be fixed to conductors having various profiles surely and firmly. <P>SOLUTION: The operation insulating rod 9 has a double tube structure including an inner tube 92 and an outer tube 93 wherein a head 91 engaging with the rotating shaft 5 of an electric path side connector is provided at the distal end of the inner tube 92, and an internal thread 94 coupling with the threaded portion 38 of the electric path side connector is formed at the distal end of the outer tube 93. In the work for fixing or removing the electric path side connector, the operation insulating rod 9 is coupled integrally with the electric path side connector by screw coupling and then the inner tube 92 is turned. The electric path side connector is provided with a contact member turnable together with the movable arm and it can be secured to a conductor of various profiles by rotating the rotating shaft 5 and moving the movable arm. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an operation insulating rod for a short-circuit grounding device for short-circuiting an uncharged electric circuit for the purpose of safety of an operator or the like when carrying out electrical work or inspection of electric power equipment with the electric circuit being uncharged.

  For electrical work to install and connect a new electric circuit for distributing power from a substation to another customer, such as a factory, etc. It is performed under the condition that the circuit is opened and the electric circuit is not charged. In such electrical work, the safety of construction workers is a matter of highest priority, and sufficient care is taken to prevent erroneous charging of the electric circuit. And even if the electric circuit is charged due to erroneous energization or induction current, it is under construction with short-circuit grounding equipment installed at both ends of the electric circuit so that the construction worker will not get an electric shock or damage the equipment. Ground the circuit. The installation of short-circuit grounding equipment is stipulated by the laws and regulations related to occupational safety, and is performed in electrical work and inspection of electric power equipment in which the electric circuit is not charged.

The short-circuit grounding equipment is an electric circuit side connector that is attached and fixed to a conductor such as an uncharged electric circuit wire, a ground side connector that is connected to a grounding electrode embedded in the ground, and a short-circuit cable that connects between the two. It consists of. The electric circuit side connector and the ground side connector must be firmly fixed to the target electric wire or the like so as to be prevented from coming off due to vibration during construction.
By the way, there are various types of conductors to which the electric circuit side connection tool is attached, such as a conductor having a circular cross section such as an electric wire or a flat conductor housed in a cupicle. In addition, there are various types of power receiving facilities at demand destinations such as factories, and the positions and surrounding conditions of places where electric circuit side connectors are fixed differ depending on the individual power receiving facilities.

  The attachment of the electric circuit side connector to the conductor is performed in the vicinity of the opened switch. When attaching the electric circuit side connector, work with the electric circuit in a non-charged state, but in the unlikely event that it is charged, the installation work is an operation called an operation insulation rod. It is performed in a state where a fixed distance is maintained between the operator and the tool. For example, when this operation insulating rod is used when attaching a circuit-side connector to a distribution facility having a nominal voltage of 22 kV, the total length of the operation insulating rod reaches 1200 mm when the portion held by the operator is included. Attach / remove the electrical circuit side connector while operating the long operation insulation rod. Thus, the installation and removal of short-circuit grounding equipment for electrical work is a complicated and difficult task that requires carefulness, and various structures have been developed as short-circuit grounding equipment to facilitate reliable installation. Yes.

  Japanese Patent Application Laid-Open No. 2002-152935 discloses a short-circuit grounding device suitable for being attached to a plate-like conductor in a cupicle. As shown in the diagram on the left side of FIG. 5, the electric circuit side connector of the short-circuit grounding device includes a pair of sandwiching portions 102 that sandwich the plate-like conductor 101 in the width direction, and the sandwiching portion includes a side portion of the conductor. Is formed, and a short-circuiting cable 104 connected to the grounding electrode in the ground is fixed to one holding portion. Both clamping portions 102 are connected to the screw portion 106 by a link mechanism 105, and the ends of the pair of clamping portions 102 are opened and closed as the screw portion 106 advances and retreats.

When attaching the electric circuit side connection tool to the conductor, as shown in the right side of FIG. 5, the operation insulating rod 109 is inserted into the insertion guide portion 107 and the screw portion 106 is rotated. In this case, the operation insulating rod 109 is relatively short, but the insertion guide portion 107 is provided with a guide groove 108 for inserting the operation insulating rod 109. When the screw portion 106 extends, the pair of sandwiching portions 102 connected by the link mechanism 105 closes, the conductor 101 is sandwiched between the recesses 103, and the electric circuit side connector is fixed to the conductor 101.
JP 2002-152935 A

  As described above, the conductor of the electric circuit to which the short-circuit grounding device is attached includes conductors of various shapes such as a plate-like one and a circular one, and the dimensions thereof vary depending on the nominal voltage of the electric circuit. Furthermore, there are various types of power receiving equipment at the customer's site or the surrounding environment, and the installation direction of the electric circuit side connector may be restricted due to the presence of an obstacle. For this reason, as the electric circuit side connection tool of a short circuit grounding fixture, what can be applied in common to conductors having various shapes and dimensions, and can be securely fixed from any direction is desirable.

In addition, the electric circuit side connector is attached at a constant distance using an operation insulating rod in order to prevent an unexpected electric shock accident such as when the electric circuit to which the short-circuit grounding device is attached is charged. After installation of the electric circuit side connection tool is completed, it is desirable to remove the long operation insulating rod so as not to obstruct the construction, and the operation insulating rod is generally detachable. Therefore, in order to attach the electric circuit side connector firmly, it is necessary to securely connect and fix the operation insulating rod and the electric circuit side connector during the installation operation. At the end of electrical work, the operation insulation rod will be connected to the electric circuit side connector again and removed, but in this case, it is necessary to securely connect the operation insulation rod and the electric circuit side connection device from a remote location. There is.
The present invention provides a short-circuit grounding device to be installed in electrical work, and enables the electric circuit side connector to be securely fixed to a conductor having various shapes from any direction, and is suitable for such an electric circuit side connector. It is an object of the present invention to provide an operation insulating rod that can be firmly fixed by applying an operating force to it, and that is easy to attach and detach.

In view of the above-described problems, the present invention provides a double mounting including an operation insulating rod and an inner tube for operation and an outer tube for connection for the purpose of robust attachment to the conductor of the electric circuit side connector and ease of work. It has a tube structure. That is, the present invention
`` Operation insulation rod for operating, attaching and detaching the electric circuit side connector of the short-circuit grounding device attached to the electric circuit,
A head portion that engages with the operation end of the electric circuit side connection tool is provided at the tip, and an inner tube made of an insulating material and a joint portion that forms an internal thread that is coupled to the screw portion of the electric circuit side connection tool are provided at the tip. An outer tube made of an insulating material,
The inner tube is inserted into the outer tube, and the inner tube is configured to be slidable in the axial direction and rotatable relative to the outer tube. ''
This is an operation insulating rod characterized by this.

  According to a second aspect of the present invention, the head of the tip of the inner tube is engaged with the operation end of the electric circuit side connection tool having a polygonal cross section and a hole having a corresponding shape. It is preferable.

  In addition, as described in claim 3, it is preferable that an insulating rubber cover is provided on a portion of the inner tube and the outer tube held by an operator.

  As described in claim 4, the operation insulating rod of the present invention is provided with the following electric circuit side connection tool, that is, a fixed arm, a movable arm, and a contact member provided rotatably on the arm, Especially for operating the electric circuit side connection tool for gripping the conductor of the electric circuit between the fixed arm and the contact member by rotating the operation end of the electric circuit side connection tool and rotating the movable arm. It is suitable.

  The operation insulating rod of the present invention has a double tube structure including an inner tube and an outer tube, a head that engages with the operation end of the electric circuit side connection tool at the tip of the inner tube, and an electric circuit at the tip of the outer tube. An internal thread that is coupled to the threaded portion of the side connector is formed. When attaching / removing the electric circuit side connector, the inner screw at the tip of the outer tube and the screw portion of the electric circuit side connector are screwed together, and the operation insulation rod is integrally connected and fixed to the electric circuit side connector. . In this state, the electric circuit side connector does not move relative to the operation insulation rod, and the electric circuit side connection device fixed to the tip of the operation insulation rod can be easily positioned at a predetermined position to hold the conductor. Can be. And since the rotation operation of the inner tube that grips and tightens the electric circuit side connector to the conductor is performed in the outer tube, the head of the inner tube does not come off from the operation end of the electric circuit side connector, and the position is separated Therefore, sufficient torque can be reliably applied to the operation end.

  In addition, after the electrical work is completed, to remove the electric circuit side connector, when reconnecting the separated operation insulation rod, first, the inner pipe is protruded and its head is connected to the operation end of the electric circuit side connector. Then, the outer tube is slid, and the inner screw at the tip is screwed to the screw portion of the electric circuit side connector. When the inner pipe is engaged with the electric circuit side connection tool, the inner pipe acts as a guide member, and the inner screw of the outer pipe is automatically aligned with the thread portion of the electric circuit side connection tool. When connecting with screws, both screws need to be accurately aligned and rotated. However, according to the insulating operation rod of the present invention, accurate alignment is easy even when operating from a remote position. is there.

  As in the invention of claim 2, when a head having a polygonal cross section is formed at the tip of the inner tube, and a hole having a shape corresponding to the head is formed at the operation end of the electric circuit side connector, and engaged. Even if it engages in the outer tube, it can be easily fitted by rotating the inner tube a little. On the other hand, for example, as described in Patent Document 1, when fitting into one guide groove, the alignment is difficult.

  As in the invention of claim 3, when an insulating rubber cover is provided on the portion of the inner tube and the outer tube held by the operator, the insulating property is increased and the electric shock can be more reliably prevented. .

  By attaching a fixed arm, a movable arm, and a contact member rotatably provided to the electric circuit side connection tool, conductors of various shapes can be gripped. That is, by rotating the operation end of the electric circuit side connection tool and rotating the movable arm, the conductor of the electric circuit is gripped between the fixed arm and the contact member, but depending on the shape of the conductor, the fixed arm and The contact area with the contact member may be reduced. At this time, since it is necessary to apply a strong operating torque in order to prevent the drop-off, the operating insulating rod is suitable for the electric circuit side connector as described in the fourth aspect of the invention.

  Hereinafter, the operation insulation rod of the short-circuit grounding apparatus of the present invention will be described with reference to the drawings. First, an outline of the electric circuit side connection tool operated by the operation insulating rod of the present invention will be described with reference to FIGS. The electric circuit side connection tool includes a fixed arm, a movable arm, and a contact member rotatably provided on the movable arm so as to be able to hold conductors of various shapes.

  As shown in FIG. 1, a head member 1 that grips a conductor is disposed at the tip of the electric circuit side connector, and a fixed arm 11 that extends in a direction perpendicular to the shaft portion 10 is formed integrally with the head member 1. Has been. In addition, a movable arm 2 is attached to the head member 1, and the movable arm 2 is rotatable about an arm support shaft 12 fixed to the head member 1. In order to rotate the movable arm 2, an operation mechanism generally indicated by reference numeral 3 is connected to the head member 1. At one end of the operation mechanism 3 is disposed an operation rod 4 that contacts and rotates the movable arm 2, and at the other end a rotation shaft 5 that is operated by an operation insulating rod 9 described later is disposed as an operation end. Has been. A bending pipe 6 that bends at a right angle is installed at an intermediate portion of the operation mechanism 3.

The lower surface of the fixed arm 11 forms a linear contact surface that comes into contact with the conductor to be gripped, and a bolt 13 is provided on the upper portion of the head member 1 to fix and suppress the short-circuit cable. When viewed from the side, the shaft portion 10 of the head member 1 is bifurcated, and the movable arm 2 is rotatably disposed in the central space portion. The base portion of the movable arm 2 is supported by an arm support shaft 12 fixed to the bulged portion of the head member 1, and the movable arm 2 is provided between the head member 1 and the arm member 12. The coil spring 7 is biased to rotate counterclockwise.
A contact member 20 is rotatably installed at the tip of the movable arm 2. The side surface of the contact member 20 is rotatably fitted to the support shaft 21 at the tip of the movable arm 2. A wirework spring 22 is attached to the support shaft 21, and the contact member 20 is urged by the wirework spring 22 to rotate clockwise.

  The head member 1 is rotatably attached to a head shaft 15 having a screw hole 14 with an inner screw formed on the inner surface, and the head member 1 provided with the movable arm 2 and the contact member 20 has an axis 16. The head member 1 can be fixed at an arbitrary angle with respect to the head shaft 15 (see the right side of FIG. 1). The screw portion 14 of the hollow joint 8 is fitted into the screw hole 14 of the head shaft 15, and the joint 8 is coupled to the bent pipe 6 with a nut 82 so that the joint 8 can be fixed at an arbitrary angle around the central axis. . An operating rod 4 is inserted into the joint 8, and the upper end of the operating rod 4 forms a spherical surface, and when the operating rod 4 is pushed up, it penetrates the head shaft 15 and is a cam on the lower surface of the movable arm 2. Contact surface 23. The operating rod 4 rotates the movable arm 2 to move the contact member 20 upward, sandwiching the conductor between the fixed arm 10 and the contact member 20, and the conductor is firmly fixed. At this time, as shown in FIG. 2, if the conductor (represented by a two-dot chain line) has a circular cross section, the state shown in FIG. 3A is obtained. If the conductor is a plate, the state shown in FIG. Thus, various shapes of conductors can be reliably gripped.

Here, the structure of the drive part in the operation mechanism 3 for moving the operation rod 4 is demonstrated.
The plurality of balls 61 arranged in the bent tube 6 placed in the middle of the operation mechanism 3 has a diameter smaller than the inner diameter of the bent tube 6, and there is a gap between the ball 61 and the inner wall of the bent tube 6. Is formed. The spherical surface at the end of the drive shaft 31 is brought into contact with the ball 61 on the opposite side of the operation rod 4 in the bending tube 6 to press the ball 61. A cylindrical drive shaft housing 32 that accommodates the drive shaft 31 is screwed to the outer periphery of the flange of the bent pipe 6 in this portion, and a screw portion that is screwed to the outer periphery of the drive shaft housing 32 with the appearance of the operation insulating rod 9. 38 is formed.

  The drive shaft 31 has a large-diameter portion provided with a screw hole 33, and a linear groove 34 is provided on the outer periphery of the large-diameter portion. A ball 35 is fitted in the groove 34, and the ball 35 is also fitted in the hole of the drive shaft housing 32 to prevent the drive shaft 31 from rotating and guide it to move in the axial direction. The outer screw of the rotary shaft 5 is fitted into the inner screw of the screw hole 33 of the drive shaft 31, and both screws constitute a so-called feed screw mechanism. The rotating shaft 5 is. A member serving as an operation end of the electric circuit side connection tool, which is provided with a polygonal hole 51 into which the head 91 having a polygonal cross section of the operation insulating rod 9 is fitted. This axial position is defined by sandwiching a lid 36 fixed to the drive shaft housing 32 with a bearing 37.

FIG. 3 shows the operation insulating rod 9 according to the present invention, which is used when the electric circuit side connector is attached to or removed from the conductor. FIG. 4 shows a situation when the electric circuit side connector and the operation insulating rod 9 are coupled.
The operation insulating rod 9 has a double tube structure including an inner tube 92 made of an insulating material such as FRP and an outer tube 93 made of the same insulating material. The outer tube 93 and the inner tube 92 are relatively rotatable and can slide within a certain range. FIG. 3 shows a state in which the inner tube 92 is projected. Although a part is omitted in FIG. 3, the total length reaches about 1200 mm when used in a 22 kV distribution facility, for example.

  A metallic cross-sectional polygonal head 91 is provided at the tip of the inner tube 92 and fits into a polygonal hole 51 formed in the rotating shaft 5 of the electric circuit side connector. In addition, a metal joint portion 95 having an inner thread 94 is provided at the tip of the outer tube 93, and is fitted into the screw 38 formed on the outer periphery of the drive shaft housing 32 when the electric path side connector is attached or detached. Thus, the operation insulating rod 9 is fixed to the electric circuit side connector. The portions of the outer tube 93 and the inner tube 92 that are held by the operator's hands are provided with a cover 96 made of insulating rubber so as to further increase the insulating property.

  In the installation work of the electric circuit side connection tool, the directions of the fixed arm 11 and the movable arm 2 are first set according to the shape of the conductor to be attached, the situation of surrounding obstacles, and the like. In the electric circuit side connector of this embodiment, the head member 1 can swing, and can be fixed around the axis at a free angle. Therefore, the head member 1 has a suitable orientation for attachment. Can be set and fixed easily.

  Then, as shown in FIG. 4, the head 91 of the inner tube 92 of the operation insulating rod 9 is fitted into the polygonal hole 51 of the rotating shaft 5 which is the operation end of the electric circuit side connection tool, and then the outer tube 93 is slid. Then, the inner screw 94 at the tip is screwed to the screw portion 38 of the drive shaft housing 32 to obtain the state shown in the lower diagram of FIG. In this state, the conductor is inserted between the fixed arm 10 and the contact member 20 close to the conductor of the opened circuit, and the rotating shaft 5 is rotated by turning the inner tube 92 of the operation insulating rod 9. When the rotating shaft 5 is rotated, the drive shaft 31 is moved in the axial direction by the feed screw mechanism, and the operating rod 4 is pushed up via the ball 61 in the bent tube 6 to firmly hold the conductor.

Since the operation insulating rod 9 is integrated with the electric circuit side connection tool by screw connection, the operation insulating rod 9 does not move relative to the electric circuit side connection tool. Therefore, the electric circuit side connector fixed to the tip of the operation insulating rod 9 can be easily positioned at a predetermined location so as to grip the conductor. Further, the rotation operation of the inner tube 92 for gripping and tightening the electric circuit side connection tool to the conductor is performed in the outer tube 93, so that the polygonal head 51 of the inner tube 92 has a polygonal hole 51 of the rotation shaft 5. Therefore, sufficient torque can be applied to the rotating shaft 5 even from a distant position.
When the attaching operation is completed, the outer tube 93 of the operation insulating rod 9 is rotated in the reverse direction, the connection by the screw is released, and the operation insulating rod 9 is removed from the electric circuit side connection tool.

  In addition, since the bending pipe 6 exists in the electric circuit side connection tool of this embodiment, the operation insulating rod 9 does not interfere with the operator's field of view, and the operator can perform the operation while visually checking the conductor to be attached. Further, when the conductor is firmly tightened, the bent tube 6 and the ball 61 are somewhat elastically deformed, so that a spring action is generated in this portion, and loosening of the tightening can be prevented.

  When the electrical work is completed, it is necessary to remove the electric circuit side connector fixed to the conductor. Since this removal operation is also performed using the operation insulating rod 9, the operation insulating rod 9 must be reconnected to the electric circuit side connector. At this time, since the operation insulating rod 9 for operating the electric circuit side connector of the present invention is a double tube, first, the inner tube 92 is protruded and its head 91 is fitted into the polygonal hole 51 of the rotating shaft 5. . When the outer tube 93 is slid in this state, the outer tube 93 is guided by the inner tube 92, and the screw portion 94 automatically aligns with the position of the screw portion 38 of the drive shaft housing 32. Both screws can be combined.

  As described above in detail, the operation insulating rod of the present invention has a double tube structure including an inner tube for operation and an outer tube for screw connection, and is firmly attached to the conductor of the electric circuit side connector and used for work. It is possible to make it easy. In the above-described embodiment, the case where the electric circuit side connector provided with the fixed arm, the movable arm, and the contact member rotatably provided on the movable arm is described. However, the operation insulating rod of the present invention grips the conductor. It is clear that the present invention can be applied to various electric circuit side connectors regardless of the structure of the portion to be performed.

It is the figure which changed the whole figure of the electrical circuit side connection tool suitable for performing attachment work etc. using the operation insulation stick | rod of this invention, and the fixing angle of a head member. It is a figure which shows the state which hold | gripped the conductor with the electrical circuit side connection tool of FIG. It is a figure which shows the operation insulation rod of this invention. It is a figure which shows the connection state of the operation insulation stick | rod and electric circuit side connection tool of this invention. It is a figure which shows the prior art example of the electrical circuit side connection tool and operation insulation stick | rod in a short circuit grounding fixture.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Head member 11 Fixed arm 2 Movable arm 20 Contact member 3 Operation mechanism 31 Drive shaft 32 Drive shaft housing 4 Operation rod 5 Rotating shaft 6 Curved tube 9 Operation insulation rod 91 Head 92 Inner tube 93 Outer tube 94 Inner screw

Claims (4)

It is an operation insulation rod for operating, attaching and detaching the electric circuit side connector of the short-circuit grounding device attached to the electric circuit,
A head portion that engages with the operation end of the electric circuit side connection tool is provided at the tip, and an inner tube made of an insulating material and a joint portion that forms an internal thread that is coupled to the screw portion of the electric circuit side connection tool are provided at the tip. An outer tube made of an insulating material,
An operation insulating rod, wherein the inner tube is inserted into the outer tube, and the inner tube is configured to be slidable and rotatable in the axial direction with respect to the outer tube. 2. The operation insulating rod according to claim 1, wherein a head portion at a tip of the inner pipe has a polygonal cross section and engages with an operation end of the electric circuit side connection tool in which a hole having a corresponding shape is formed. The operation insulating rod according to claim 1 or 2, wherein a cover made of an insulating rubber is provided on a portion of the inner tube and the outer tube held by an operator. The electric circuit side connector includes a fixed arm, a movable arm, and a contact member that is rotatably provided on the fixed arm, and rotates the operation end of the electric circuit side connector to rotate the movable arm. The operation insulation rod according to claim 1, wherein the conductor of the electric circuit is gripped between the fixed arm and the contact member.

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