JP2013162734A - Jumper sleeve cover and method of connecting ground line to electric wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a connecting work for a ground line to an electric wire such as an overhead distribution line necessary for electric construction near a construction site.SOLUTION: A grounding work window for exposing a jumper sleeve housed inside is formed in a cylindrical cover base 111 mounted on a jumper wire 32 to cover the jumper sleeve to which an electric wire, for example, an overhead distribution line 5 is connected, and it is made possible to open and close the grounding work window by slidably moving a slide cover 131. When a ground line is connected to the overhead distribution line 5 in electric construction, the jumper sleeve is exposed from the grounding work window by slidably moving the slide cover 131 while one end of the ground line connected to a gripper provided to an insulating operation bar is grounded, and the exposed jumper sleeve is gripped with the gripper.

Description

  The present invention relates to a jumper sleeve cover that covers a jumper sleeve provided on a jumper wire that connects an electric wire such as an aerial distribution line and the electric wire, and a method for connecting an earth wire to the electric wire using the jumper sleeve cover.

  When electrical work is performed, it is necessary to ground the overhead power transmission line and overhead power distribution line from the viewpoint of ensuring safety. In the case of an overhead power transmission line spanned between steel towers, grounding can be performed by connecting a ground wire to a jumper wire that connects two overhead power transmission lines. For example, as described in “Prior Art” of Patent Document 1, an insulating work bar (ground hook bar in Patent Document 1) having a gripping tool with a ground wire at the tip is prepared. This is done by gripping the jumper wire with a gripping tool by an operation with an insulating work bar.

  On the other hand, overhead distribution lines that run around urban areas and rural areas are slightly different from high-voltage overhead transmission lines. Overhead distribution lines are suspended in lower places than overhead transmission lines, and above all, they are close to people. It is easy for people to reach. For example, accidents in which overhead distribution lines are disconnected due to natural disasters such as a typhoon or a man-made disaster such as a crane truck being caught and drooping on the roadside occur every year. The possibility of children or drunk people climbing up on the utility pole and touching the overhead distribution lines directly must also be considered. For overhead distribution lines, more stringent measures to prevent electric shock are required. In fact, every power company takes strict measures to prevent electric shock from overhead distribution lines. The most important thing is that the overhead distribution line is a covered wire. For the same purpose, the jumper wires are also covered wires. As for the jumper wire, two jumper wires are electrically connected by a jumper sleeve. In this case, the jumper sleeve is covered with a cover to prevent an electric shock accident or the like.

  As has been seen above, the overhead distribution lines and their jumper wires are basically covered wires, and there are very few bare circuit sections. Therefore, when performing electrical work, it is not possible to adopt a grounding technique as described in “Prior Art” of Patent Document 1. Therefore, conventionally, what kind of measures have been adopted for grounding an overhead distribution line is the deployment of a grounding device for connecting a ground wire. An example is shown in FIG.

  In FIG. 10, 1 is a utility pole, and a brace 3 is fixed to the utility pole 1 by a belt 2. The brace 3 supports the aerial distribution line 5 via the pin insulator 4. The overhead power distribution line 5 includes a grounding device 6 for connecting a working ground wire 11. The grounding device 6 has a structure capable of screwing the grounding terminal 12 fixed to one end side of the grounding wire 11, and electrically connects the screwed grounding terminal 12 to the overhead distribution line 5. Then, after grounding the grounding part (not shown) provided on the other end side of the ground wire 11 and connecting the grounding terminal 12 provided on the one end side to the grounding device 6, the overhead distribution line 5 is grounded. It becomes possible.

Registered Utility Model No. 2510597

  When electrical work is performed in urban areas or rural areas, grounding equipment is not always provided near the construction site. Depending on the location, it is not uncommon for grounding equipment not to be deployed on overhead distribution lines unless you go to the other side across obstacles such as mountains and rivers. In such a case, you must go to the place where the grounding equipment is placed in an automobile and connect a ground wire for work to this, or find a bare wire section and connect a ground wire, It is extremely complicated.

  The present invention has been made in view of such points, and an object thereof is to allow a ground wire to be connected to an electric wire such as an overhead distribution line necessary for electric work near a construction site. To do.

  The jumper sleeve cover of the present invention includes a cylindrical cover base that is mounted on a jumper wire in a form that covers a jumper sleeve that connects electric wires, and an opening formed in the cover base, the jumper covering the cover base A grounding work window that exposes the sleeve in a state that it can be gripped by a gripping tool with a ground wire provided on an insulating operation rod; and the grounding work window that is slidably attached to the cover base along its axial direction. The above-mentioned problem has been solved by providing a slide lid that opens and closes and a suppression means that suppresses free sliding movement of the slide lid by frictional resistance between the cover base and the slide lid.

  The method of connecting the ground wire to the electric wire according to the present invention includes a step of grounding the ground wire connected to a gripping tool provided on an insulating operation rod, and a jumper wire attached to the jumper wire so as to cover a jumper sleeve for connecting the electric wire. Slide the slide cover attached to the cylindrical cover base so as to be slidable along the axial direction, and hold the slide cover at the position after the movement by the frictional resistance with the cover base. Opening a grounding work window, which is an opening formed in the cover base, exposing the jumper sleeve covered by the cover base in a state where the jumper sleeve can be gripped by the gripper; and the jumper sleeve exposed from the grounding work window. And the step of gripping with the gripping tool.

  According to the present invention, when connecting a ground wire to an electric wire, for example, an overhead distribution wire, in electrical work, the jumper sleeve that is exposed by opening the slide lid is gripped by a gripping tool with a ground wire. A ground wire can be connected to an electric wire such as an aerial distribution wire via a jumper sleeve and jumper wires that exist in a relatively large number in a place where the electric wire is stretched. The ground wire can be connected near the construction site.

The perspective view which shows the state which attached the jumper sleeve cover of this Embodiment to the jumper sleeve as one Embodiment. The exploded front view of the jumper sleeve cover which shows 1st Embodiment. (A) is the sectional view on the AA line in FIG. 2, (b) is the sectional view on the BB line in FIG. The front view of a jumper sleeve cover. The front view of the jumper sleeve cover which shows the state which opened the slide lid | cover. The front view of the jumper sleeve cover which shows 2nd Embodiment. The front view of the jumper sleeve cover which shows the state which opened the slide lid | cover. An exploded front view of the jumper sleeve cover. (A) is the sectional view on the AA line in FIG. 8, (b) is the sectional view on the BB line in FIG. The perspective view which shows the state which attached | subjected the ground wire to the grounding fixture as an example of the past.

≪Application example of jumper sleeve cover of this embodiment≫
FIG. 1 is a perspective view showing a state in which the jumper sleeve cover 101 of the present embodiment is mounted on a jumper sleeve (not shown). As shown in FIG. 1, two arm brackets 3 are fixed to the utility pole 1 by a belt 2. Two sets of overhead distribution wires 5 (5 (a) and 5 (b)) as electric wires are supported on each of the two arm brackets 3 via a tension insulator 31. These two sets of overhead distribution lines 5 (5 (a), 5 (b)) are connected via jumper wires 32, respectively. The jumper wires 32 are separated into jumper wires 32 (a) connected to one set of overhead distribution wires 5a and jumper wires 32 (b) connected to the other set of overhead distribution wires 5b. These are connected to each other by a jumper sleeve (not shown). In FIG. 1, the jumper sleeve cover 101 of the present embodiment covers the jumper sleeve.

≪First embodiment≫
A first embodiment will be described with reference to FIGS.

  As shown in FIG. 2, the jumper sleeve cover 101 is formed by combining a cover base 111 and a slide lid 131. The cover base 111 has a cylindrical shape that is attached to the jumper wire 32 so as to cover a jumper sleeve (not shown), and has horn portions 112 at both ends thereof. The horn portion 112 has a shape that narrows the inner diameter of the cover base 111 to substantially the same diameter as the jumper wire 32, and ensures the close contact of the jumper sleeve cover 101 with the jumper wire 32.

  The cover base 111 has a grounding work window 113 at the center thereof. The grounding work window 113 is an opening formed in the cover base 111 and exposes a jumper sleeve that the cover base 111 covers and stores. What is important here is the exposed state of the jumper sleeve by the grounding work window 113. The grounding work window 113 is formed with a shape and a size so that the jumper sleeve is exposed in a state where it can be gripped by a gripping tool (not shown) with a ground wire provided on the insulating operation rod. . That is, as shown in FIG. 3A, the grounding work window 113 is formed in a shape and size that wraps around a virtual circle to an area exceeding a semicircle when the cover base 111 is viewed from the side. . By doing so, most of the jumper sleeve housed in the cover base 111 is exposed from the grounding work window 113.

  The gripping tool (not shown) with a ground wire provided on the above-described insulating operation rod is, for example, a hook with a ground wire. As is well known, various adapters can be detachably attached to the tip of the insulating work bar, and the adapter can be operated by the operation on the rear end side. One of such adapters is a hook with a ground wire. In this configuration, a pair of gripping arms provided so as to be able to approach and move apart can be moved closer to and away from each other by an operation on the rear end side of the insulating operation rod, for example, a rotation operation, and an object can be gripped by the pair of gripping arms. Although there are various types of hooks, the cover base 111 is generally exposed from the grounding work window 113 formed by wrapping around a virtual circle to an area exceeding a semicircle when viewed from the side. If it is a jumper sleeve, it can be gripped sufficiently. Another important attribute of such a hook with a ground wire is that the hook portion is made of metal and the ground wire is connected to the metal portion. If the end portion of the ground wire is grounded by embedding it in the ground, for example, the object can be grounded by holding the object with a hook. The “gripping tool with ground wire provided on the insulating operation rod” described above is a well-known instrument familiar to those skilled in the art such as an electric power company or an electrician, so further explanation is omitted. To do.

  The slide lid 131 is slidably attached to the outer peripheral surface of the cover base 111. The slide movement direction is the axial direction of the cover base 111. The slide lid 131 is formed longer than the length of the grounding work window 113, and therefore opens and closes the grounding work window 113 according to the sliding movement operation (see FIG. 2). As shown in FIG. 3B, the slide lid 131 is formed in a shape that wraps around an area exceeding the semicircle on the virtual circumference when viewed from the side. Accordingly, the cover base 111 is held in a state of being fitted.

  The cover base 111 includes a pair of convex portions 114 on a part of the outer peripheral surface thereof. The slide lid 131 includes a pair of concave grooves 132 into which the convex portions 114 are fitted in a part of the inner peripheral surface thereof. The convex portions 114 and the concave grooves 132 are formed long along the axial direction of the cover base 111, that is, along the sliding movement direction of the slide lid 131. Therefore, the convex portion 114 and the concave groove 132 form a rotation prevention structure, and the slide lid 131 slides in a state of being prevented from rotating with respect to the cover base 111.

  The slide lid 131 includes a handle 133 in the vicinity of the center portion of the outer peripheral surface thereof. The handle 133 has an arch shape that can be gripped by a gripping tool (not shown) with a ground wire provided on the above-described insulating operation rod (see FIG. 3B).

  The cover base 111 and the slide lid 131 are devised so that they can be attached later to the existing jumper wires 32. A notch 115 formed in the cover base 111 and an opening 134 provided in the slide lid 131.

  The cover base 111 has a cut 115 formed on the side provided with the grounding work window 113 (see FIG. 3A). The cut 115 is formed to have a length over the entire length of the cover base 111 and reaches the ends of the horn portions 112 located at both ends. Accordingly, the cover base 111 is opened at the notch 115 and restored to its original shape by its elastic restoring force. In order to support such an opening / closing operation of the cover base 111, the cover base 111 is made of rubber having a dielectric property as an example. Therefore, the cover base 111 can be attached to the jumper wire 32 by opening the cover base 111 at the notch 115 and inserting the existing jumper wire 32 into the open portion.

  As described above, the slide lid 131 is formed in a shape that wraps around an area exceeding the semicircle on the virtual circumference as viewed from the side. This means that the slide lid 131 inherently forms an opening 134 due to its shape (see FIG. 3B). The slide lid 131 is configured so that the existing jumper wire 32 can be inserted into the opening 134 and then slid from the one end side toward the cover base 111 already attached to the jumper wire 32. It can be attached to the base 111. In order to prevent the cover base 111 from opening unexpectedly from the notch 115, such a slide lid 131 is made of a material superior in shape retention than the cover base 111, for example, a hard plastic having dielectric properties. It is desirable that it be formed.

  Further, the cover base 111 and the slide lid 131 are formed by pairing the outer diameter and the inner diameter of each other, or by making the inner diameter of the slide lid 131 slightly smaller than the outer diameter of the cover base 111. Yes. As a result, free sliding movement of the slide lid 131 can be suppressed by the frictional resistance between the cover base 111 and the slide lid 131 (suppression means). Suppressing the free sliding movement of the slide lid 131 is extremely important in maintaining the position of the slide lid 131 in the closed state and the open state of the grounding work window 113.

  In such a configuration, the jumper sleeve cover 101 normally closes the grounding work window 113 with the slide lid 131 (see FIG. 4). On the other hand, when the grounding of the overhead power distribution line 5 is required during the electrical work, the slide lid 131 is slid to open the grounding work window 113. Hereinafter, the grounding operation of the overhead distribution line 5 will be described.

  First, the operator prepares an insulating work bar (not shown) having a gripping tool with a ground wire attached to the tip. The end of the ground wire is grounded in advance. As an example, the grounding is performed by burying the end of the ground wire in the ground. As another example, grounding may be performed by connecting an end portion of a ground wire to a grounding terminal (not shown) provided on the utility pole 1.

  Next, the operator grasps the handle 133 of the slide lid 131 with a gripping tool with a ground wire, and slides the slide lid 131. This is in the direction of opening the grounding work window 113. By doing so, the grounding work window 113 is opened, and the jumper sleeve (not shown) covered and housed by the cover base 111 can be exposed.

  Next, the operator grips the exposed jumper sleeve with a gripping tool attached to the tip of the insulating work bar. By doing so, the ground wire can be connected to the overhead distribution line 5 via the jumper sleeve and the jumper wire 32. In this state, the aerial distribution line 5 is grounded, so that the worker can perform the electrical work with peace of mind.

  When the electrical work is completed, the operator removes the gripping tool from the jumper sleeve and releases the gripping tool from the jumper sleeve. Then, the grip 133 of the slide lid 131 is gripped by a gripping tool attached to the tip of the insulating work bar, the slide lid 131 is slid, and the grounding work window 113 is closed again. By doing so, the jumper sleeve cover 101 returns to the normal state that completely covers the jumper sleeve, and it is possible to ensure safety.

  As described above, according to the present embodiment, a ground wire can be connected to the overhead distribution line 5 by using a relatively large number of jumper sleeves where the overhead distribution line 5 is stretched. . Therefore, it is possible to connect the ground wire to the overhead distribution line 5 necessary for the electrical work near the construction site.

  In this embodiment, a grip 133 that can be gripped by a gripping tool with a ground wire attached to the tip of an insulating work bar is provided on the slide lid 131, and the grip 133 is gripped by the gripping tool and the slide lid 131 is slid and moved. I was able to let you. This makes it possible to share a tool necessary for the work for opening the slide lid 131 and a tool necessary for the work for gripping and grounding the jumper sleeve. As a result, it is possible to reduce the work load of the equipment transportation work and the grounding work itself.

  In the present embodiment, the device (the cut 115 and the opening 134) that can be attached later to the existing jumper wire 32 is further refined. Thereby, it is possible to attach the jumper sleeve cover 101 to the existing jumper wire 32 as a retrofit.

<< Second Embodiment >>
A second embodiment will be described with reference to FIGS. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is also omitted.

  In this embodiment, the cover base 111 is provided with a pocket 122 for hermetically storing one end of the slide lid 131. As a structure for that purpose, the cover base 111 has one end on the side where the pocket 122 is formed having a larger diameter than the other part, thereby forming a first large-diameter portion 121. The slide lid 131 also has a large diameter on the side accommodated in the pocket 122 and serves as a second large diameter portion 141. Please refer to FIG.

  The first large diameter portion 121 forms a pocket 122 with the side facing the grounding work window 113 as an entrance (see FIGS. 8 and 9A). The pocket 122 is a groove formed in an arc shape having a curvature that matches the curvature of the second large diameter portion 141 formed in the slide lid 131 and into which the distal end portion of the second large diameter portion 141 can be inserted.

  The second large diameter portion 141 has a portion accommodated in the pocket 122 as an insertion portion 142, and this portion is formed in a thin shape as if the inner peripheral side was scraped (FIGS. 8 and 9B). reference). The second large-diameter portion 141 also has an outer peripheral side of the insertion portion 142 formed on an inclined surface having a tapered shape.

  The pocket 122 and the insertion portion 142 are formed in a shape that matches each other. However, at the entrance of the pocket 122, the edge near the axis of the cover base 111 is an inclined surface 123. This is to facilitate insertion of the insertion portion 142 formed at one end of the slide lid 131 as the slide lid 131 moves.

  In such a configuration, when the slide lid 131 slides in a direction in which the grounding work window 113 is closed in a state in which the grounding work window 113 is open, an insertion portion formed at one end of the slide lid 131 is associated with this operation. 142 is inserted into the pocket 122 and finally stored in the pocket 122. Thereby, at least on the side where the insertion portion 142 is accommodated in the pocket 122, the adhesion between the cover base 111 and the slide lid 131 is increased, and rainwater can be reliably prevented from entering from the gap.

≪Modification≫
In the first embodiment and the second embodiment, various modifications and changes can be made in the implementation. For example, the cover base 111 may be cylindrical, and is not limited to a cylindrical shape, and may be a polygonal column shape or a cross-sectional elliptical shape. In this case, needless to say, the slide lid 131 is formed in a shape that matches the outer shape of the cover base 111. When the cover base 111 is formed in a shape other than such a cylindrical shape, the slide lid 131 is naturally prevented from rotating, so that a rotation preventing structure by the convex portion 114 and the concave groove 132 can be eliminated.

  The material of the cover base 111 and the slide lid 131 need not necessarily be made of the exemplified rubber or hard plastic as long as it has dielectric properties. As far as the cover base 111 is concerned, various materials can be used as long as they can be attached to the existing jumper wires 32 and can be restored to the original shape while undergoing a certain degree of elastic deformation. Alternatively, if the convenience of retrofitting to the existing jumper wire 32 is not required, even the condition of elastic deformation that can be restored in the first place is not necessary, and the choice of materials is expanded. In this case, neither the cut 115 in the cover base 111 nor the opening 134 in the slide lid 131 is required. Since one slide lid 131 does not require the condition of elastic deformation in the first place, the choice of materials is wider.

  The handle 133 does not necessarily have an arch shape as long as it can be gripped by a gripping tool provided on the insulating work bar, and may be, for example, a projection shape. Alternatively, even if it is a shape that can be gripped by the gripping tool, it is not essential if the convenience of gripping by the gripping tool is not required.

5 Overhead distribution lines (electric wires)
32 Jumper wire 111 Cover base 113 Grounding work window 115 Notch 131 Slide lid 133 Handle 134 Opening 122 Pocket

Claims (7)

A cylindrical cover base that is attached to the jumper wire in a form that covers a jumper sleeve that connects the wires;
A grounding work window that is an opening formed in the cover base and exposes the jumper sleeve covered by the cover base in a state that it can be gripped by a gripping tool with a ground wire provided on an insulating operation rod;
A slide lid that is slidably attached along the axial direction to the cover base and opens and closes the grounding work window;
Suppression means for suppressing free sliding movement of the slide lid by frictional resistance between the cover base and the slide lid;
Jumper sleeve cover characterized by comprising.   The jumper sleeve cover according to claim 1, further comprising the handle provided on the slide lid and having a shape that can be gripped by the gripping tool.   The cover base includes a pocket that receives one end of the slide lid that slides toward a closed position that covers the grounding work window, and hermetically stores the one end of the slide lid at the closed position. The jumper sleeve cover according to claim 1 or 2, wherein The cover base is formed of an elastically deformable material, has a notch extending over its entire length in the axial direction, and is formed so as to be able to contact and separate so that a portion of the notch can pass the electric wire,
The slide lid includes an opening through which the electric wire passes,
The cover base and the slide lid are formed in a shape that allows the slide lid to be mounted by sliding the slide lid from one end side of the cover base.
The jumper sleeve cover according to claim 1, wherein the jumper sleeve cover is provided. A step of grounding the ground wire connected to a gripping tool provided on an insulating operation rod;
Friction between the cover base and the cover base, which is slidably attached along the axial direction to the cylindrical cover base attached to the jumper wire in a form covering the jumper sleeve connecting the electric wires A grounding work window that holds the slide lid in a position after movement by a resistor and exposes the jumper sleeve that is formed in the cover base and is covered by the cover base in a state that it can be gripped by the gripping tool. Opening the process,
Gripping the jumper sleeve exposed from the grounding work window with the gripping tool;
A method for connecting a ground wire to an electric wire, comprising:   The slide cover, which is provided on the slide lid and has a shape that can be gripped by the gripping tool, is slid using the insulating operation rod in a state of being gripped by the gripping tool. Item 6. A ground wire connection method according to Item 5. Releasing the grip of the gripper with respect to the jumper sleeve;
Sliding the slide lid and closing the grounding window again with the slide lid;
The ground wire connection method according to claim 5, wherein the ground wire connection method is provided.

Images