JP4874635B2 - Short circuit ground and test tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To readily, speedily, and surely provide a connection to the ground and perform testing work from the operation port of an insulating cover. <P>SOLUTION: A screw hole 8 is provided for the upper surface of a current collector 7. The lower end of a wing bolt 10, that is passed through the center hole of a presser plate 9 having downward edges at both ends of a plate body facing each other, is helically fastened to the screw hole 8 of the current collector 7. Two current collector plates 13, having an approximately L-shaped cross section and bent at an angle smaller than 90 degrees, are provided. Short-leg parts 13a of the current collector plates 13 are each alternately inserted between the presser plate 9 and the upper surface of the current collector 7 from the opposite sides. Long-leg parts 13b of the current collector plates 13 are suspended downward on both sides of the current collector 7 and extended below the current collector 7. The bent parts of the two current collector plates 13 are positioned outside both sides of the current collector 7 and are fastened to the inside of the downward edges of the presser plate 9; the lower surface of the current collector 7 is brought into contact with a connection part B; the long-leg parts 13b of the current collector plates 13 are each arranged over both sides of the connection part B; and then by fastening the wing bolt 10, the long-leg parts 13b of the two current collector plates 13 are each alternately made to approach each other to hold the connection part B from both sides. <P>COPYRIGHT: (C)2007,JPO&amp;INPIT

Description

  In the structure in which the connection terminal of the underground power distribution device and the terminal of the cable terminal connection part are fixed with bolts and the connection part is covered with the insulation cover, The present invention relates to a short-circuit grounding and a test tool that can reliably perform grounding and test work.

  Conventionally, in the structure where the connection terminal of the above-mentioned underground power distribution equipment and the terminal of the cable terminal connection part are fixed with bolts and the connection part is covered with an insulating cover, when performing short-circuit grounding or test work, the insulation A tool is inserted from a small work port of the cover, and after removing one of the two terminal fixing bolts of the cable terminal connection terminal, a short-circuit grounding tool is attached with the bolt.

  However, from such a small work opening covered with an insulating cover, put a tool in, loosen and remove the terminal fixing bolt that connects the connection terminal of the power distribution equipment and the terminal of the cable terminal connection, In order to attach one end of the short-circuit grounding tool to the relevant part and tighten it with other bolts, a separate tool is required, and the work in a narrow part takes time and effort. Moreover, after removing the short-circuit grounding tool, it is feared that the terminal fixing bolt that has been removed is forgotten to be tightened. Furthermore, the conventional product has only a short-circuit grounding function and cannot be used for maintenance work such as a pressure test.

  The present invention has been made in view of these points, and provides a short-circuit grounding and a test tool capable of performing grounding and testing work easily, quickly and reliably from the working port of the insulating cover, and solves the above-mentioned problems. It is something to try.

  Accordingly, the invention of claim 1 is a short-circuit grounding and test tool that is attached to a connection part that is bolted by overlapping a connection terminal of an electric device and a terminal of a cable terminal connection part, and is fixed on the upper surface of a substantially box-shaped current collector. A screw hole with a depth of 5 mm is provided, a holding plate having downward edges is provided at opposite ends of the plate body, and the lower end of the bolt with the head passed through the center hole of the holding plate is used as the screw hole of the current collector. Two current collector plates that are screwed and have a substantially L-shaped cross section and a bending angle of less than 90 degrees are provided, and the short legs of each current collector plate are placed between the holding plate and the upper surface of the current collector. Insert so that they do not overlap each other and insert them from the opposite side, and hang the long legs of each current collector plate on both sides of the current collector, and extend under the current collector, and then two current collector plates The bent portions of the current collector are positioned outward from both sides of the current collector, and the inner side of the downward edge of the pressing plate One end of a conducting wire led to the outside is connected to any one of the above-described constituent members, the lower surface of the current collector is applied to the connection portion, and long legs of each current collector plate on both sides of the connection portion And tightening the bolt, the holding plate presses the bent part of each of the two current collector plates, the long legs of the two current collector plates are brought close to each other, and the short circuit of the configuration Grounding and test tools were used.

  According to a second aspect of the present invention, there is provided a short-circuit grounding and test tool according to the first aspect of the invention, wherein a recess for inserting the head of the bolt of the connecting portion is provided on the lower surface of the current collector. According to a third aspect of the present invention, in the first or second aspect of the present invention, a short-circuit grounding and test are provided, wherein a spring is provided between the two opposing current collecting plates to urge the current collecting plates so as to be always separated. A tool was used. According to a fourth aspect of the present invention, there is provided the stopper according to any one of the first, second and third aspects, wherein the two current collecting plates can be butted against each other so that the current collecting plates are not close to each other by a certain distance. Was used as a short-circuit grounding and test tool. The invention of claim 5 is the short-circuit grounding and test tool according to any one of claims 1, 2, 3, and 4, wherein the head-mounted bolt is a butterfly bolt.

  According to the inventions of claims 1 to 5, the short-circuit grounding and the lower surface of the current collector of the test tool are pressed against the connection part bolted by overlapping the connection terminal of the electric device and the terminal of the cable terminal connection part, Cover the long legs of the two current collector plates on both sides of the connection part, and tighten the bolt with the head.The long legs are close to each other, and the long legs are tightened with the short legs and the test tool. Is firmly fixed to the connection portion, and the current collector and the two current collector plates are in contact with the connection portion, so that the electrical connection is ensured. Therefore, the short-circuit grounding and the attachment of the test tool to the connection portion between the terminals can be performed very easily and quickly. Therefore, even when the connection portion is covered with an insulating cover and the short-circuit ground and the test tool are inserted and installed from a small work port, the short-circuit ground and the test tool are inserted from the work port, The attachment is completed simply by tightening the bolt with the head attached to the connection part, and the work can be easily performed even in a narrow place. Also, when used as a short-circuit grounding tool, three-phase conductors are connected and short-circuited, and when used as a test tool such as withstand voltage, the above-mentioned conductors of each tool are separated from each other, and voltage is applied from each of the conductors. Tests such as application of can be performed.

  Furthermore, in the invention of claim 2, since the recess for inserting the head of the bolt of the connection portion is provided on the lower surface of the current collector, the recess is pressed when the lower surface of the current collector is pressed against the connection portion. Becomes a guide, and the tool can be fixed more stably. Further, in the invention of claim 3, since the spring for urging the current collector plates to be always separated is provided between the two current collector plates, the long legs of the two current collector plates are always open. It is easy to put the tool on the connection part. Further, in the invention of claim 4, since the stopper is provided so that the two current collector plates are not in close proximity to each other when the bolt is tightened, the short-circuit grounding and the test tool are connected to each other. Do not overtighten the part and do not damage the connection. Further, in the invention of claim 5, since the bolt with the head of the short-circuit grounding and the test tool is a butterfly bolt, when attaching the tool to the connection portion, the bolt can be manually tightened by an operator. There is no need to prepare.

  In the short-circuit grounding and test tool attached to the connection part bolted by overlapping the connection terminal of the electrical equipment and the terminal of the cable terminal connection part, a screw hole of a certain depth is provided on the upper surface of the substantially box-shaped current collector, In addition, a recess for fitting the bolt head of the connecting portion is provided on the lower surface of the current collector, and pressing plates having downward edges are provided at opposite ends of the plate body, and are passed through the central hole of the pressing plate. The lower end of the bolt with the head is screwed into the screw hole of the current collector, and two current collector plates having a substantially L-shaped cross section and a bending angle smaller than 90 degrees are provided. Insert the short leg part from the opposite side by shifting it so that it does not overlap between the holding plate and the upper surface of the current collector, and hang the long leg part of each current collector plate on both sides of the current collector Extend below the current collector, curve its lower ends close to each other, and Each of the bent portions of the plate is positioned outward from both sides of the current collector, locked to the inside of the downward edge of the pressing plate, and one end of the conducting wire led out to any one of the above components With the connected configuration, the concave portion on the lower surface of the current collector of the tool is put on the bolt head of the connection portion, the tool is applied to the connection portion, and the long leg portions of the current collector plates are placed on both sides of the connection portion. Covering, by tightening the bolt with the head, the holding plate presses the bent portion of each of the two current collector plates, and the long legs of each of the two current collector plates are brought close to each other to sandwich the connection portion, Short-circuit grounding and test tools were used.

The present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional front view showing a state in which the short-circuit grounding and test tool A of the present invention is attached to the connection portion B, and FIGS. It is a sectional front view and a sectional side view. A connection portion B is provided in which a connection terminal 1 of an electrical device (not shown) and a terminal 3 of a cable end connection portion 2 are overlapped and screwed by passing a bolt 4 therethrough, and this connection portion B is provided as a bushing 5 of the electrical device. And an insulating cover 6, and a work port 6 a is provided at six locations of the insulating cover at a position facing the connecting portion B. The working port 6a is normally closed with a lid (not shown), and the working port 6a is opened at the time of short-circuit grounding work or test work, and the tool A of the present invention is opened from the working port 6a. The tool A is attached to the connecting portion B by insertion.

  4 and 5 show a front view and a side view of the short-circuit grounding and test tool A of the present invention, and a screw box 8 penetrating from the upper surface to the lower surface of the substantially box-shaped current collector 7 is provided, and two plates are provided. The holding plates 9 having the downward edges 9a are provided at opposite ends of each plate body, and the downward edges 9a are also provided at both ends at positions shifted by 90 degrees from these downward edges 9a. Further, the lower end of the butterfly bolt 10 that has passed through the central hole 9 b of these presser plates 9 is screwed into the screw hole 8 of the current collector 7 and protrudes below the screw hole 8. The lower surface of the current collector 7 has a recessed portion 7a and a large recessed portion 7b that can be fitted to the head of the bolt 4 of the connecting portion B, and the lower end of the screw hole 8 is the recessed portion 7a. Open in. In the recess 7 a, a stopper plate 11 for preventing the butterfly bolt 10 from coming off and a screw 12 for fixing the stopper plate 11 to the lower end of the butterfly bolt 10 are attached to the lower end of the butterfly bolt 10 protruding from the screw hole 8. Provided.

  Further, two current collecting plates 13 having a substantially L-shaped cross section and a bending angle slightly smaller than 90 degrees are provided, and the short legs 13 a of the current collecting plates 13 are provided on the upper surfaces of the holding plate 9 and the current collector 7. So that they do not overlap each other and do not touch the butterfly bolt 10 and are inserted from the opposite sides, and the long legs 13b of the current collector plates 13 are placed on both sides of the current collector 7. It hangs down and extends below the current collector 7, and its lower ends are curved so as to be close to each other. In addition, the tip of the short foot portion 13a of each current collector plate 13 extends substantially to the end opposite to the insertion side between the pressing plate 9 and the upper surface of the current collector 7, The bent portions of the two current collector plates 13 protrude outward on both sides of the current collector 7, and are fitted into the downward edges 9 a of the four sides of the pressing plate 9.

  Further, as shown in FIG. 5, a copper stranded wire 14 is attached to the short-circuit grounding and test tool A, and the copper is connected to the butterfly bolt 10 between the butterfly portion of the butterfly bolt 10 and the holding plate 9. One crimp terminal 15 of the crimp terminals 15 provided at both ends of the stranded wire 14 is locked.

  6 to 8 show the details of the current collector 7 and have the above-described configuration, and the side of the current collector 7 where the long legs 13b of the two current collector plates 13 are not suspended. Projecting arms 7c facing downward from the upper ends of the two projecting plates protrude from the two side plates of the current collector 7 (see FIGS. 5 and 6). And each stopper 16 extended from the both-sides edge of the long leg part 13b of the said two current collector plates 13 is shown in FIG. 5, in the gap | interval 7d of the both side plates of the said collector 7, and each protrusion arm 7c. The two current collector plates are formed by extending the tips of the stoppers 16 of one current collector plate 13 of the two current collector plates 13 facing each other to the tips of the stoppers 16 of the other current collector plate 13. 13 and 13 are controlled. In addition, protrusions 17 are provided below the stoppers 16 of the current collector plates 13, respectively, and both ends are locked to the protrusions 17, so that the side plates of the current collector 7 and the protruding arms 7c are connected to each other. A spring 18 extending in the gap 7d is provided, and as shown in FIG. 4, the two current collector plates 13 are always urged in the direction in which the lower portions thereof are separated from each other by the repulsive force of the spring 18.

  9 to 13 show the details of each of the current collector plates 13 and have the above-described configuration, and the short foot portion 13a is divided into two at intervals. When combined on the upper surface of the current collector 7, as shown in FIG. 13, between the two short legs 13a of one current collector 13, the two short legs 13a of the other current collector 13 are One is inserted and the axis of the butterfly bolt 10 is inserted.

  When attaching the short-circuit grounding and the test tool A having the above configuration to the connection portion B covered with the insulating cover 6, the work port cover (not shown) is taken, and as shown in FIGS. The tool A is inserted from the working port, the large recess 7b on the lower surface of the current collector 7 is put on the head of the bolt 4 of the connection part B, the tool A is brought into contact with the connection part B, and two current collectors are provided. The long legs 13b of the plate 13 are positioned on both sides of the connection part B. When the butterfly bolt 10 is tightened, the butterfly bolt 10 is screwed into the screw hole 8 of the current collector 7, but the current collector 7 is pressed by the current collector plates 13 on both sides. The current collector 7 does not rotate, and the current collector 7 rises along the butterfly bolt 10 so that the lower surface of the holding plate 9 and the upper surface of the current collector 7 are relatively close to each other, as shown in FIG. Each bent portion of the two current collector plates 13 is pushed by the holding plate 9 and rotates around the tip of each short foot portion 13a, and each long foot portion 13b is close to each other, and the connection portion B between them is sandwiched. To do. The tool A is fixed to the connection portion B. At this time, even if the butterfly bolt 10 is tightened too much, the tips of the stoppers 16 of the two current collector plates 13 will contact each other, and the current collector plates 13 will not approach any further, and the connecting portion B will not be excessively tightened. . Further, when the tool A is removed from the connection portion B, when the butterfly bolt 10 is loosened, the holding plate 9 and the upper surface of the current collector 7 are separated from each other, and the two current collection plates 13 are connected by the repulsive force of the spring 18. Apart from B, the tool A can be pulled out of the connection B and removed.

  Also, when using the short-circuit grounding and the test tool A as a short-circuit grounding tool, as shown in FIG. 14, the tool A is attached to each of the three-phase connection portions B, and the lower ends of the copper stranded wires 14. Are connected to each other with a butterfly bolt 19 or the like and short-circuited. One grounding clamp 20 of a cord 21 having grounding clamps 20 at both ends is connected to one tool A, and the other is connected. The grounding clamp 20 is connected to a grounded object (not shown). Further, when the tool A is used as a test tool, as shown in FIG. 15, the phases of the crimp terminals 15 of the tools A are separated from each other from the state shown in FIG. 14, and the grounding clamp 20 is removed. Each time, a test such as application of voltage from the copper wire 14 is performed.

  In addition, although the butterfly bolt 10 was used in the said Example, it is not restricted to a butterfly bolt, What is necessary is just other bolts with a head body, such as an eyebolt in which the head became a ring shape. Further, instead of the butterfly bolt 10, the lower end of the bolt is passed through the screw hole 8 of the current collector 7 without screwing, and a stopper 11 is fixed to the outer periphery of the bolt below the screw hole 8, If the wing nut is screwed onto the bolt protruding on the plate 9 and the wing nut is turned, the wing nut pushes the holding plate 9 so that the gap between the holding plate 9 and the current collector 7 is reduced. good. Moreover, in the said Example, although the stopper 16 and the spring 18 were provided in the two current collecting plates 13, the said tool operate | moves even if these structures are not provided, and there exists the said effect.

It is a cross-sectional front view which shows the state which attached the tool A of this invention to the connection part B. It is a cross-sectional front view which shows the use condition at the time of attaching the tool A of this invention to the connection part B. It is a cross-sectional side view which shows the use condition at the time of attaching the tool A of this invention to the connection part B. It is a front view which shows the tool A of this invention. It is a side view which shows the tool A of this invention. It is a side view of the electrical power collector of the tool A of this invention. It is a front view of the electrical power collector of the tool A of this invention. It is a bottom view of the electrical power collector of the tool A of this invention. It is a left view of the current collection plate of the tool A of this invention. It is a front view of the current collecting plate of the tool A of this invention. FIG. 10 is a cross-sectional view of the current collector of the tool A of the present invention taken along line XX in FIG. 9. It is a top view of the current collection board of the tool A of this invention. It is a top view which combined the two current collecting plates of the tool A of this invention. It is explanatory drawing at the time of using the tool A of this invention as a short circuit grounding tool. It is explanatory drawing at the time of using the tool A of this invention as a test tool.

Explanation of symbols

A Short-circuit grounding and test tool B Connection 1 Connection terminal 2 Cable termination connection 3 Terminal 4 Bolt 5 Electrical equipment bushing 6 Insulation cover 6a Work port 7 Current collector 8 Screw hole 9 Holding plate 10 Butterfly bolt 13 Current collector plate 13a Short leg part 13b Long leg part 16 Stopper 17 Protrusion 18 Spring

Claims (5)

  In the short-circuit grounding and test tool attached to the connection part bolted by overlapping the connection terminal of the electrical equipment and the terminal of the cable terminal connection part, a screw hole of a certain depth is provided on the upper surface of the substantially box-shaped current collector, A holding plate having downward edges is provided at opposite ends of the plate body, and the lower end of the bolt with the head passed through the central hole of the holding plate is screwed into the screw hole of the current collector, and the cross section is substantially L-shaped. Two current collector plates with a bending angle of less than 90 degrees are provided, and the short legs of each current collector plate are shifted so as not to overlap each other between the holding plate and the upper surface of the current collector. The long legs of each current collector plate are suspended from both sides of the current collector and extended below the current collector, and the bent portions of the two current collector plates are connected to the current collector. Positioned outward from both sides of the electric body, locked inside the downward edge of the holding plate, By connecting one end of a conducting wire leading out to the component, applying the lower surface of the current collector to the connecting part, covering the long leg part of each current collector plate on both sides of the connecting part, and tightening the bolt In addition, the holding plate is configured to hold the connection portion by holding the bent portions of the two current collector plates and bringing the long leg portions of the two current collector plates close to each other, Test tool.   2. The short-circuit grounding and test tool according to claim 1, wherein a recess for inserting the head of the bolt of the connection portion is provided on the lower surface of the current collector.   3. The short-circuit grounding and testing tool according to claim 1 or 2, wherein a spring is provided between the two opposing current collecting plates to urge the current collecting plates so as to be always separated from each other.   4. The stopper according to claim 1, wherein a stopper that can be butted against each other is provided so as not to be close to each other from the two current collecting plates. Short circuit ground and test tool. 5. The short-circuit grounding and testing tool according to claim 1, wherein the head-mounted bolt is a butterfly bolt.

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