JP2017026318A - Short circuit prevention tool and short circuit prevention method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a short circuit prevention tool and a short circuit prevention method that can prevent a plurality of exposed wires from short-circuiting during the uninterruptible replacement work of a measuring instrument such as a watt-hour meter.SOLUTION: A short circuit prevention tool 10 is used in the interruptible replacement work of a measuring instrument, exposing a plurality of wires 20a-20f upward from a top surface 52a after the measuring instrument is removed in an uninterruptible manner by inserting the plurality of wires 20a-20f in the vertical direction through the top surface 52a of an interruptible replacement tool 50 to electrically connect a power supply side wiring including the plurality of wires 20a-20f extending upward and connected with the measuring instrument and load side wiring. The short circuit prevention tool includes a side board 13; and a plurality of partition sections 14a-14f that extend from one surface of the side board 13 and placed between adjacent wires 20a-20f placed on the top surface 52a.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a short-circuit prevention tool and a short-circuit prevention method for preventing a short circuit between wires in an uninterruptible replacement operation of a meter such as a watt hour meter.

  Use an uninterruptible replacement tool to prevent a power failure during replacement work when replacing a meter such as a watt-hour meter that measures power usage at home for replacement, inspection, repair, etc. Replacing the electricity meter is performed due to a power failure. In the watt hour meter, the load side wiring and the power source side wiring are connected, and in the uninterruptible work, the wiring work is performed in a state where the load side wiring and the power supply side wiring are short-circuited by the uninterruptible replacement tool. In the uninterruptible replacement work of the watt-hour meter, in addition to the method of connecting the wires one by one, a method of replacing the watt-hour meter by connecting a plurality of wires to the uninterruptible replacement tool is known. .

  In the following Patent Document 1, a watt-hour meter is provided with a wire connecting portion for connecting each wiring in the watt hour meter body, a terminal hole for inserting the wiring into the wire connecting portion, and a partition wall for partitioning the insertion hole of the terminal hole. Is described. As a result, when connecting each wiring to the watt hour meter, even if the stranded wire of the conductor portion of the wiring is broken, by providing a partition wall, it is possible to prevent a short circuit accident without entering another insertion hole. it can.

JP 2001-215244 A

  However, the watt-hour meter described in Patent Document 1 has a partition wall attached to a wire connecting portion of the watt-hour meter. For this reason, in the method of replacing the watt hour meter by connecting multiple wires to the uninterruptible replacement tool at one time, removing the watt hour meter will also remove the partition wall from the wires, exposing each of the multiple wires. It becomes a state. Therefore, there is a possibility that a short circuit accident may occur due to contact between the exposed wires.

  This invention solves the said subject, and provides the short-circuit prevention tool and short-circuit prevention method which can prevent the short circuit of several exposed wiring at the time of uninterruptible replacement work of meters, such as a watt-hour meter. Objective.

  The short-circuit prevention tool according to one aspect of the present invention has an upper surface of an uninterruptible replacement tool for electrically connecting a power supply side wiring and a load side wiring included in a plurality of wirings extending upward and connected to a meter. A short-circuit prevention tool used for uninterruptible replacement work of the instrument in which a plurality of the wires are inserted vertically and the instrument is removed uninterruptibly and the plurality of wires are exposed upward from the upper surface. The side plate and a plurality of partition portions that extend from one surface of the side plate and are placed on the upper surface and disposed between the adjacent wirings.

  According to this, when the watt hour meter is removed and a plurality of wires are exposed during the uninterruptible replacement operation of a meter such as a watt hour meter, the partition portion is placed on the upper surface of the uninterruptible replacement tool. , Between adjacent wirings. For this reason, it is possible to prevent a short circuit between the plurality of exposed wires.

  As a desirable mode of the present invention, it has a guide that extends below the partition and faces the side surface of the uninterruptible replacement tool. According to this, by providing the guide, the partition portion can slide in the direction along the side surface of the uninterruptible replacement tool. For this reason, a partition part can be easily arrange | positioned between adjacent wiring in the upper surface of an uninterruptible replacement tool.

  As a desirable mode of the present invention, between the adjacent partition portions is opened upward. According to this, it is possible to adjust the wiring and the like from between the partitioning portions while preventing the short circuit by arranging the partitioning portions between the adjacent wirings.

  As a desirable mode of the present invention, a cover plate is provided above between the adjacent partition portions. According to this, it can prevent that a tool etc. contact the exposed wiring by providing a cover board, arrange | positioning a partition part between adjacent wiring, and preventing a short circuit.

  As a desirable mode of the present invention, the side plate or the partition part has translucency. According to this, when a partition part is arrange | positioned between adjacent wiring, the state of wiring can be visually confirmed through a side plate or a partition part.

  As a desirable mode of the present invention, a height of the partition portion in a direction perpendicular to the upper surface is higher than a height of a portion where the wiring is exposed from the upper surface. According to this, a short circuit of wiring is reliably prevented by the partition part. In addition, when performing the wiring adjustment work, it is possible to prevent the tool from coming into contact with the adjacent wiring and short-circuiting the wiring.

  As a desirable aspect of the present invention, a support portion is provided at a lower end of the side plate on a surface opposite to the surface on which the partition portion is provided of the side plate, and the support portion is the partition portion with respect to the side plate. It extends in the direction opposite to the extending direction. According to this, since a side plate and a partition part are suppressed falling and a side plate and a partition part are stably mounted on the upper surface of an uninterruptible replacement tool, the short circuit of wiring can be prevented.

  The method for preventing a short circuit according to an aspect of the present invention includes an upper surface of an uninterruptible replacement tool for electrically connecting a power supply side wiring and a load side wiring included in a plurality of wirings extending upward and connected to a meter. A step of inserting a plurality of the wires in a vertical direction, a step of removing the instrument from the plurality of wires, exposing the plurality of wires upward from the upper surface, a side plate, and one side of the side plate Placing the short-circuit prevention tool having a plurality of extending partition portions on the upper surface, and placing the partition portions between the adjacent wirings.

  According to this, when the watt hour meter is removed and a plurality of wires are exposed during the uninterruptible replacement operation of a meter such as a watt hour meter, the short-circuit prevention tool is placed on the upper surface of the uninterruptible replacement tool. Since the partition portion is disposed between the adjacent wirings, it is possible to prevent a short circuit between the plurality of exposed wirings.

  As a desirable mode of the present invention, the short circuit prevention tool has a guide that extends below the partition portion and faces the side surface of the uninterruptible replacement tool, and the short circuit prevention tool is placed on the upper surface. Then, the said short-circuit prevention tool is slid toward the said some wiring, and the said partition part is arrange | positioned among the said some wiring. According to this, a partition part can be easily arrange | positioned between adjacent wiring by sliding a short-circuit prevention tool on the upper surface of the uninterruptible replacement tool connected to the some wiring.

  According to the short-circuit prevention tool and the short-circuit prevention method according to one aspect of the present invention, it is possible to prevent a short circuit between a plurality of exposed wires during an uninterruptible replacement operation of a meter such as a watt hour meter.

FIG. 1 is a perspective view of a short-circuit prevention tool according to the first embodiment. FIG. 2 is a front view of the short-circuit prevention tool according to the first embodiment. FIG. 3 is a top view of the short-circuit prevention tool according to the first embodiment. FIG. 4 is a side view of the short-circuit prevention tool according to the first embodiment. FIG. 5 is a front view of the watt-hour meter. FIG. 6 is a side view of the watt-hour meter. FIG. 7 is an explanatory diagram for explaining the short-circuit prevention method according to the first embodiment. FIG. 8 is a top view of the uninterruptible replacement tool. FIG. 9 is a schematic circuit diagram illustrating a connection state of a plurality of wires when an uninterruptible replacement tool is connected. FIG. 10 is a schematic cross-sectional view taken along the line AA shown in FIG. 7 and viewed from the arrow direction. FIG. 11 is a perspective view of the protective member according to the present embodiment. FIG. 12 is a front view of the protection member. FIG. 13 is a top view of the protective member. FIG. 14 is a side view of the protective member. FIG. 15 is a bottom view of the terminal portion of the watt hour meter when the protection member is attached. FIG. 16 is a front view of a short-circuit prevention tool according to a modification of the first embodiment. FIG. 17 is a top view of a short-circuit prevention tool according to a modification of the first embodiment. FIG. 18 is a perspective view of a short-circuit prevention tool according to the second embodiment. FIG. 19 is a schematic cross-sectional view when the short-circuit preventing tool of the second embodiment is placed on the uninterruptible replacement tool. FIG. 20 is a perspective view of a short-circuit prevention tool according to a first modification of the second embodiment. FIG. 21 is a schematic cross-sectional view when the short-circuit preventing tool according to the first modification is placed on the uninterruptible replacement tool. FIG. 22 is a perspective view of a short-circuit preventing tool according to a second modification of the second embodiment. FIG. 23 is a perspective view of a short-circuit prevention tool according to a third modification of the second embodiment.

  Hereinafter, embodiments of a short-circuit prevention tool and a short-circuit prevention method according to the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by the following embodiment. Further, the constituent elements of this embodiment include those that can be replaced while maintaining the identity of the invention and that are obvious for replacement. Moreover, the method, apparatus, and modification example described in this embodiment can be arbitrarily combined within the scope obvious to those skilled in the art.

(First embodiment)
FIG. 1 is a perspective view of a short-circuit prevention tool according to the first embodiment. FIG. 2 is a front view of the short-circuit prevention tool according to the first embodiment. FIG. 3 is a top view of the short-circuit prevention tool. FIG. 4 is a side view of the short-circuit prevention tool. As shown in FIG. 1, the short-circuit prevention tool 10 of the present embodiment extends from the side plate 13, a plurality of partition portions 14 a to 14 f extending from one surface of the side plate 13, and the other surface of the side plate 13. It has the support part 12 and the guides 16 and 16 provided continuously with the partition parts 14a and 14f.

  As shown in FIG. 2, the side plate 13 is a rectangular flat plate when viewed from the front. As shown in FIG. 4, the plurality of partition portions 14 a to 14 f are rectangular flat plates in a side view. The partition portions 14 a to 14 f extend in a direction intersecting with one surface of the side plate 13 and extend in the vertical direction (direction along the short side of the side plate 13). Further, the plurality of partition portions 14a to 14f are arranged at intervals in the direction along the long side of the side plate 13, and as shown in FIGS. 2 and 3, the plurality of wirings 20a to 20f are connected to the partition portion 14a. It is arranged between ˜14f. In addition, a cover member or the like is not provided above between the adjacent partition portions 14a to 14f and is open.

  The support portion 12 is provided at the lower end on the other surface of the side plate 13. As shown in FIGS. 3 and 4, the support portion 12 extends in the direction along the long side of the side plate 13 and extends in the direction opposite to the extending direction of the partition portions 14 a to 14 f with respect to the side plate 13. . By the support part 12, it can suppress that the short circuit prevention tool 10 falls, and can be mounted stably. The guide 16 is connected to the partition portions 14a and 14f by the step portion 15, and the guide 16 is provided outside the partition portions 14a and 14f in the arrangement direction of the partition portions 14a to 14f. The guide 16 extends below the partition portions 14a to 14f, and has a function of a guide that suppresses misalignment when the upper surface of the uninterruptible replacement tool described later is slid. Although the support part 12 is made into flat form, it is not limited to this, A shape and a magnitude | size can be changed suitably.

  As shown in FIGS. 2 and 3, each of the wirings 20 a to 20 f includes a conductor portion 22 in which a plurality of wires are combined and a covering 21 that covers the conductor portion 22. The conductive portion 22 is made of a conductive material including a metal material such as copper (Cu). The covering 21 is made of insulating resin or the like. As will be described later, the plurality of wirings 20a to 20f are wirings connected to the watt hour meter. For example, the wirings 20a to 20c are load-side wirings that supply power to electrical devices and the like, and the wirings 20d to 20f. Is a power supply side wiring to which power from an electric power company is supplied. The wirings 20a to 20f extend in the vertical direction, and the conductor portion 22 is exposed at the upper end side without the covering 21 being provided. The exposed conductor 22 is connected to the watt hour meter.

  As shown in FIGS. 2 and 3, the partition 14b is disposed between the wiring 20a and the wiring 20b, and the partition 14c is disposed between the wiring 20b and the wiring 20c. A partition 14d is disposed between the wiring 20d and the wiring 20e, and a partition 14e is disposed between the wiring 20e and the wiring 20f. The partition portions 14a to 14f are made of an insulating material. Thus, by providing the partition portions 14a to 14f between the wires 20a to 20f, the wires 20a to 20f are brought into contact with each other and short-circuited. Can be prevented.

  As shown in FIGS. 2 and 3, no partition is provided between the wiring 20c and the wiring 20d. In the present embodiment, since the same-phase voltage is supplied to the wiring 20c and the wiring 20d, a short-circuit accident does not occur even if they are contacted. However, the present invention is not limited to this, and a partition portion may be provided between the wiring 20c and the wiring 20d. Moreover, the partition part 14a and the partition part 14f are provided on the outer side in the arrangement direction of the wiring 20a to the wiring 20f so as to sandwich the wiring 20a to the wiring 20f. The partitions 14a and 14f prevent the external objects such as the operator's hands and tools from coming into contact with the wirings 20a and 20f.

  Moreover, it is preferable that the short circuit prevention tool 10 has translucency. For example, the side plate 13, the partition portions 14a to 14f, the support portion 12, and the guide 16 may be integrally formed using a translucent resin material. Since at least the side plate 13 or the partitioning portions 14a to 14f have translucency, when the partitioning portions 14a to 14f are arranged between the wirings 20a to 20f, the wiring 20a passes through the side plate 13 and the partitioning portions 14a to 14f. It is possible to visually confirm the state of ˜20f. And since the cover member etc. are not provided above the partition parts 14a-14f as above-mentioned, in the state which has arrange | positioned the partition parts 14a-14f between wiring 20a-20f, an insulating tool etc. It is possible to adjust the wirings 20a to 20f from the upper open part.

  The short-circuit prevention tool 10 of the present embodiment is a short-circuit prevention tool that is used for uninterruptible replacement work of a meter such as a watt hour meter and prevents a short circuit between a plurality of wires connected to the watt hour meter. FIG. 5 is a front view of the watt-hour meter. FIG. 6 is a side view of the watt-hour meter. The watt-hour meter 100 of the present embodiment is a low-voltage meter used for power measurement in a low-voltage voltage section of AC 600V or less. As the watt-hour meter 100, a known one can be used, which may be an inductive watt-hour meter or an electronic watt-hour meter. The watt-hour meter 100 may be installed on the wall surface of a building such as a general household, or may be installed inside a case or the like installed on the wall surface.

  As shown in FIGS. 5 and 6, the watt hour meter 100 includes a main body portion 101 and a terminal portion 102 provided on the lower side of the main body portion 101. The main body 101 includes a measurement unit (not shown) that measures the integration of power consumption on the load side, a display unit (not shown) that displays the measured power consumption, and the like. As shown in FIG. 5, the terminal portion 102 includes a terminal 111 for connecting the wirings 20 a to 20 f, an upper clamping screw 121, and a lower clamping screw 122. The conductor portions 22 of the wirings 20a to 20f are inserted into the inside from the lower surface side of the terminal portion 102 and are tightened by the upper tightening screw 121 and the lower tightening screw 122, respectively. Thereby, the electrode (not shown) provided in the terminal 111 and the conductor part 22 are electrically connected. Each wiring 20a-20f connected to the terminal portion 102 extends downward. The terminal unit 102 connects the power supply side wirings 20d to 20f and the measurement unit (not shown) of the main body unit 101, and the measurement unit (not shown) of the main body unit 101 and the load side wirings 20a to 20c. Connect. The watt-hour meter 100 of the present embodiment is a single-phase three-wire watt-hour meter that connects three power supply-side wirings 20d to 20f and three load-side wirings 20a to 20c.

  For the sake of explanation, FIG. 5 shows a state where the cover of the terminal portion 102 is removed, but as shown in FIG. 6, a cover 103 is provided to cover each terminal 111 of the terminal portion 102. The cover 103 is fixed, for example, by screwing a mounting screw 104 (see FIG. 6) into a screw hole 105 (see FIG. 5). A protective member 30 is provided on a part of the back surface and the bottom surface of the terminal portion 102.

  Next, a method for preventing a short circuit in an uninterruptible replacement operation of a meter such as a watt hour meter according to the present embodiment will be described. FIG. 7 is an explanatory diagram for explaining the short-circuit prevention method according to the first embodiment. Each left figure of Drawing 7 is a mimetic diagram when it sees from the front side of a watt-hour meter, and each right figure is a mimetic diagram when it sees from the right side of an watt-hour meter.

  In the uninterruptible replacement work of the watt hour meter, first, the uninterruptible replacement tool 50 is connected to the plurality of wires 20a to 20f extending from the terminal portion 102 of the watt hour meter 100 (FIG. 7, step ST1). The uninterruptible replacement tool 50 is a tool for replacing the watt-hour meter 100 without an uninterruptible power, and collects the power supply side wirings 20d to 20f and the corresponding load side wirings 20a to 20c in a lump. Can be connected.

  FIG. 8 is a top view of the uninterruptible replacement tool. FIG. 9 is a schematic circuit diagram illustrating a connection state of a plurality of wires when an uninterruptible replacement tool is connected. As shown in ST1 of FIG. 7 and FIG. 8, the uninterruptible replacement tool 50 includes a tool body 51 and a connection portion 52 that is thinner than the tool body 51. The tool main body 51 houses therein a connection circuit that connects the power supply side wirings 20d to 20f and the load side wirings 20a to 20c. The connection part 52 extends from the tool body 51 toward the wirings 20a to 20f, the tip part is fixed to the wirings 20a to 20f, and a connection for electrically connecting the wirings 20a to 20f inside the connection part 52. An electrode 55 is provided.

  As shown in FIG. 8, the connection part 52 has a width larger than the entire width of the arranged wirings 20a to 20f. A concave portion 52d that is recessed toward the tool body 51 is provided at a tip portion of the connection portion 52 at a position corresponding to each of the wires 20a to 20f. The recess 52 d penetrates from the upper surface 52 a side to the lower surface side along the thickness direction of the connection portion 52. The adjacent recesses 52d and 52d are separated by a wall 52b, and the wirings 20a to 20f are inserted into the recess 52d one by one. The wirings 20a to 20f in the recess 52d are sandwiched and fixed by the wiring pressing part 52c and the fixing part 58. The fixing portion 58 is a rod-like member extending in the width direction of the connection portion 52, and is provided through the plurality of wall portions 52b. The wiring pressing part 52c can be fixed so as to press the wirings 20a to 20f to the fixing part 58 side by an elastic force such as a spring, for example. In this way, the wires 20a to 20f are inserted in the vertical direction of the upper surface 52a, and the uninterruptible replacement tool 50 is attached to the wires 20a to 20f.

  The uninterruptible replacement tool 50 is provided with a through hole 56 that penetrates the tool main body 51 and the connection portion 52, and the through hole 56 opens in the front of the tool main body 51 and in the recess 52 d of the connection portion 52. Open. Inside the through hole 56, a push screw 57 and a connection electrode 55 are provided. By rotating the push screw 57 in the tightening direction from the tool body 51 side, the connection electrode 55 is pushed by the push screw 57 and advances in the direction of the recess 52d. The tip of the connection electrode 55 protrudes from the through hole 56 into the recess 52d and contacts the wirings 20a to 20f. Further, by rotating the push screw 57, the tip of the connection electrode 55 penetrates the coating 21 of the wirings 20a to 20f and is connected to the conductor portion 22.

  As shown in FIG. 9, the connection electrode 55 is electrically connected to the connection circuit of the tool main body 51, and the wiring 20 a and the wiring 20 f are connected in the tool main body 51 through the connection electrode 55. Similarly, the wiring 20b and the wiring 20e are connected in the tool main body 51 through the connection electrode 55, and the wiring 20c and the wiring 20d are connected in the tool main body 51 through the connection electrode 55. Between the connected wirings 20a to 20f, detection circuits 59a to 59c including, for example, an ammeter are provided so that the connection state can be detected. In this way, the power supply side wirings 20d to 20f and the load side wirings 20a to 20c are connected by the uninterruptible replacement tool 50. Therefore, even if the watt hour meter 100 is removed during replacement work, Power is supplied.

  Returning to step ST1 of FIG. 7, the power supply-side wirings 20d to 20f and the load-side wirings 20a to 20c are connected by the uninterruptible replacement tool 50, and the short-circuit prevention tool is connected to the upper surface 52a of the connection portion 52. 10 is placed. The upper surface 52a is a mounting surface on which the short-circuit prevention tool 10 is mounted. The short-circuit prevention tool 10 is placed so that the partition portions 14a to 14f extend in a direction along the extending direction of the wirings 20a to 20f. That is, the partition portions 14 a to 14 f extend upward with respect to the upper surface 52 a of the connection portion 52 and extend in a direction along the extending direction of the connection portion 52.

  By loosening the upper fastening screw 121 and the lower fastening screw 122 (see FIG. 5) of the terminal portion 102 of the watt hour meter 100 and lifting the watt hour meter 100 upward, the watt hour meter 100 is connected to the wires 20a to 20f. (Step ST2 in FIG. 7). The conductor portion 22 of the wirings 20a to 20f from which the watt hour meter 100 is removed extends upward from the upper surface 52a of the uninterruptible replacement tool 50 and is exposed.

  In the short-circuit prevention tool 10 of the present embodiment, guides 16 and 16 are provided on the partition portions 14a and 14f located on the outermost side among the arrayed partition portions 14a to 14f. The guides 16, 16 extend below the partition portions 14 a, 14 f and face the side surfaces of the uninterruptible replacement tool 50. With the guides 16, 16, the short-circuit prevention tool 10 placed on the upper surface 52 a of the connection portion 52 can be slid along the extending direction of the connection portion 52. The guides 16 and 16 may have a slight space between the side surfaces of the uninterruptible replacement tool 50 and may be in contact with the side surfaces of the uninterruptible replacement tool 50. In addition, although the guide 16 is provided in the partition parts 14a and 14f, it is not restricted to this, For example, it is also possible to provide in the support part 12. FIG.

  Next, the partition parts 14a to 14f are arranged between the wirings 20a to 20f by sliding the short-circuit prevention tool 10 toward the plurality of wirings 20a to 20f toward the distal end side of the connection part 52 (FIG. 7, Step ST3). A support portion 12 is provided at the lower end of the side plate 13, and the support portion 12 is provided on the opposite side of the partition portions 14 a to 14 f with respect to the side plate 13. The support portion 12 extends in the direction opposite to the partition portions 14 a to 14 f with respect to the side plate 13. Thus, since the support part 12 is provided, it can suppress that the short circuit prevention tool 10 falls, and can slide the upper surface 52a stably.

  FIG. 10 is a schematic cross-sectional view taken along line AA shown in step ST3 of FIG. 7 and viewed from the arrow direction. As shown in FIG. 10, the wirings 20a to 20f are inserted in the vertical direction of the upper surface 52a of the connection portion 52, and the conductor portion 22 is exposed above the upper surface 52a. The partition part 14b is arrange | positioned between the wiring 20a exposed from the uninterruptible replacement tool 50, and the wiring 20b. The partition portion 14c is disposed between the wiring 20b and the wiring 20c. The partition portion 14d is disposed between the wiring 20d and the wiring 20e. The partition portion 14e is disposed between the wiring 20e and the wiring 20f. Moreover, the partition parts 14a and 14f are provided so that the some wiring 20a-20f may be pinched | interposed. Moreover, since the partition parts 14a-14f are provided in the position which overlaps with the wall part 52b of the connection part 52, when the short circuit prevention tool 10 is slid, the partition parts 14a-14f and wiring 20a-20f are connected. Contact can be suppressed.

  In this way, when the watt hour meter 100 is removed and the plurality of wires 20a to 20f are exposed at the time of uninterruptible replacement work of a meter such as the watt hour meter 100, the short-circuit prevention tool 10 becomes the uninterruptible replacement tool 50. Since the partition portions 14b to 14e are placed between the adjacent wirings 20a to 20f, a short circuit between the exposed wirings 20a to 20f can be prevented.

  Moreover, since the short circuit prevention tool 10 has the guides 16 and 16 for slidably moving the upper surface 52a of the connection part 52, when sliding the short circuit prevention tool 10, it is partitioning part 14a-14f. The contact with the conductor 22 can be suppressed to prevent a short circuit.

  As shown in FIG. 10, the height of the partition portions 14 a to 14 f is higher than the height of the portion of the wirings 20 a to 20 f (conductor portion 22) exposed from the upper surface 52 a of the connection portion 52. For this reason, the short circuit of adjacent wiring 20a-20f can be prevented reliably.

  As for the short circuit prevention tool 10 of this embodiment, at least one of the side plate 13 or the partition parts 14a-14f has translucency. For this reason, it is possible to visually confirm the state of the plurality of wirings 20a to 20f exposed from the upper surface 52a of the uninterruptible replacement tool 50 when the watt hour meter 100 is removed with the short-circuit prevention tool 10 installed. It is. For example, it is possible to confirm whether the exposed conductor portion 22 is in a distorted state or whether the wire material containing the metal material of the conductor portion 22 is unwound and spread.

  No cover member is provided above the partition portions 14a to 14f, and the space between the adjacent partition portions 14a to 14f is open upward. For this reason, in the state where the short-circuit prevention tool 10 is provided, a correction operation such as distortion of the conductor portion 22 of the wirings 20a to 20f using a tool such as pliers becomes easy. At this time, since the partition portions 14a to 14f are higher than the wirings 20a to 20f, it is possible to suppress the adjacent wirings 20a to 20f from being short-circuited via the tool.

  Next, the short-circuit prevention tool 10 is moved away from the wirings 20a to 20f, and the wirings 20a to 20f and the new watt-hour meter 100A are connected (FIG. 7, step ST4). Thereafter, the uninterruptible replacement tool 50 is removed from the wirings 20a to 20f, and the uninterruptible replacement work of the watt-hour meter is completed.

  As described above, the short-circuit prevention tool 10 of the present embodiment electrically connects the power-side wiring and the load-side wiring included in the plurality of wirings 20a to 20f extending upward and connected to the meter such as the watt hour meter 100. A plurality of wirings 20a to 20f are vertically inserted in the upper surface 52a of the uninterruptible replacement tool 50 for connection, and a meter such as the watt hour meter 100 is removed uninterruptively and a plurality of upwards from the upper surface 52a. A short-circuit prevention tool used for uninterruptible replacement work of a meter such as the watt hour meter 100 in which the wirings 20a to 20f are exposed, and extends from one side of the side plate 13 and the side plate 13 and is placed on the upper surface 52a. And arranged between adjacent wirings 20a to 20f.

  Moreover, the short circuit prevention method of this embodiment is for electrically connecting the power supply side wiring and the load side wiring included in the plurality of wirings 20a to 20f extending upward and connected to the meter such as the watt hour meter 100. A step in which the plurality of wires 20a to 20f are vertically inserted into the upper surface 52a of the uninterruptible replacement tool 50, and a meter such as the watt hour meter 100 is removed from the plurality of wires 20a to 20f, and the plurality of wires 20a to 20f A step of exposing 20f upward from the upper surface 52a, a side plate 13, and a plurality of partition portions 14a to 14f extending from one surface of the side plate 13 are placed on the upper surface 52a. And arranging the partition portions 14a to 14f between the adjacent wirings 20a to 20f.

  According to the short-circuit prevention tool 10 and the short-circuit prevention method of the present embodiment, when the watt-hour meter 100 is removed and a plurality of wirings 20a to 20f are exposed at the time of uninterruptible replacement work of a meter such as the watt-hour meter 100. Since the short-circuit prevention tool 10 is placed on the upper surface 52a of the uninterruptible replacement tool 50 and the partition portions 14b to 14e are arranged between the adjacent wires 20a to 20f, the exposed wires 20a to 20f are short-circuited. Can be prevented.

  Moreover, in the short circuit prevention method of this embodiment, as shown to step ST1 of FIG. 7, the protection member 30 is provided in the back surface of the terminal part 102 of the watt-hour meter 100. FIG. When removing the watt-hour meter 100 from the wirings 20a to 20f, it is desirable to lift the watt-hour meter 100 straight in the extending direction of the wirings 20a to 20f. By doing so, it is possible to prevent the conductive portions 22 of the wirings 20a to 20f from coming into contact with the casing of the terminal portion 102. However, when the watt-hour meter 100 is installed at a high position and the watt-hour meter 100 is lifted obliquely upward or the like, if the protective member 30 is not provided, the exposed conductive portion 22 is exposed to the terminal portion 102. There is a possibility that the wirings 20a to 20f are short-circuited in contact with the housing or the like.

  FIG. 11 is a perspective view of the protective member according to the present embodiment. FIG. 12 is a front view of the protection member. FIG. 13 is a top view of the protective member. FIG. 14 is a side view of the protective member. FIG. 15 is a bottom view of the terminal portion of the watt hour meter when the protection member is attached. As shown in FIGS. 11 to 14, the protection member 30 includes a magnet sheet 31 and an insulating member 32. The insulating member 32 has a flat plate-like back surface portion 32a and a bottom portion 32b protruding from one surface of the back surface portion 32a. As shown in FIG. 12, the back surface portion 32a has a rectangular shape, and the bottom portion 32b is provided along one side of the back surface portion 32a. The insulating member 32 is formed of, for example, an insulating material such as a resin material.

  The magnet sheet 31 is formed into a sheet by mixing magnet powder with a binder such as resin or rubber. The material of the magnet powder is not particularly limited, and a ferrite magnet or a rare earth magnet can be used. The magnet sheet 31 is bonded to the surface on which the bottom portion 32b of the protection member 30 is provided via an adhesive (not shown).

  When the casing of the terminal unit 102 of the watt-hour meter 100 is a metal material whose main component is, for example, iron (Fe), the protective member 30 is magnetically applied to the casing of the terminal unit 102 by the magnetic force of the magnet sheet 31. Is adsorbed.

  As shown in FIG. 15, the terminal portion 102 includes a housing 106 for housing the wirings 20 a to 20 f (not shown in FIG. 15) and a cover 103 attached to the front surface of the housing 106. . The bottom plate 106a of the housing 106 is provided with insertion holes 107a to 107f for inserting the wirings 20a to 20f. Here, the side on which the cover 103 is provided is the front side of the terminal portion 102, and the opposite side of the cover 103 with respect to the insertion holes 107a to 107f is the back side.

  The protection member 30 is attached to the back side of the housing 106 of the terminal portion 102 by the magnetic force of the magnet sheet 31. A back surface portion 32 a of the protection member 30 covers the back surface of the housing 106 via the magnet sheet 31. Further, the bottom portion 32b of the protection member 30 is provided so as to overlap with the bottom plate 106a on the back side of the insertion holes 107a to 107f so as not to overlap with the insertion holes 107a to 107f. The back surface portion 32a and the bottom portion 32b are preferably larger than the width of the housing 106 (length in the direction in which the insertion holes 107a to 107f are arranged).

  Thus, by attaching the protection member 30 to the terminal portion 102, the back surface of the housing 106 and the back surface side of the bottom plate 106a are protected. For this reason, when the watt-hour meter 100 is removed from the wirings 20a to 20f (see FIG. 7), the conductor portion 22 of the wirings 20a to 20f can be prevented from coming into contact with the housing 106 and short-circuiting.

  As shown in FIG. 15, the bottom portion 32b of the protection member 30 covers only a part of the bottom plate 106a. However, the watt hour meter 100 is inclined in the direction inclined to the front side from the extending direction of the wirings 20a to 20f. Often removed. For this reason, the short side of wiring 20a-20f can be prevented by covering the back side rather than insertion hole 107a-107f among bottom boards 106a with protection member 30.

  Since the protection member 30 is fixed to the housing 106 by the magnetic force of the magnet sheet 31, it is possible to easily perform the attaching operation and the removing operation. Further, the casing 106 of the terminal portion 102 may be made of a metal to which the magnet sheet 31 is attracted, and a fixing structure such as a screw hole for fixing the protection member 30 is not necessary. For this reason, in the uninterruptible replacement work of the watt-hour meter 100 as shown in FIG. 7, the protection member 30 of the removed watt-hour meter 100 can be replaced with a new watt-hour meter 100A and reused.

(Modification)
FIG. 16 is a front view of a short-circuit prevention tool according to a modification of the first embodiment. FIG. 17 is a top view of a short-circuit prevention tool according to a modification. The short-circuit prevention tool 10 shown in FIGS. 1 to 4 is a single-phase three-wire watt-hour meter that connects three power supply-side wires 20d to 20f and three load-side wires 20a to 20c. Although it is used for uninterruptible replacement work, it is not limited to this. The short-circuit prevention tool 10A of the modification shown in FIGS. 16 and 17 is used for uninterruptible replacement work of a single-phase two-wire watt-hour meter. For example, the wirings 20g and 20h are wirings on the load side, and the wirings 20i and 20j are wirings on the power supply side.

  As shown in FIGS. 16 and 17, in the short-circuit prevention tool 10 </ b> A of the modification, five partition portions 14 g to 14 k extend from the side plate 13 </ b> A. The partition portions 14g to 14k extend in a direction along the extending direction of the wirings 20g to 20i, respectively, and are arranged at intervals in the arrangement direction of the wirings 20g to 20j. The partition part 14h is disposed between the wiring 20g and the wiring 20h. The partition portion 14i is disposed between the wiring 20h and the wiring 20i. The partition portion 14j is disposed between the wiring 20i and the wiring 20j. The partition part 14g and the partition part 14k are arrange | positioned so that wiring 20g-20i may be pinched | interposed.

  The short-circuit prevention tool 10A is placed on the upper surface 52a of the uninterruptible replacement tool 50 (see FIG. 7), and is slidable by guides 16A provided in the partition part 14g and the partition part 14k, respectively. As described above, also in the short-circuit prevention tool 10A of the present modification, when the watt-hour meter 100 is removed and the plurality of wirings 20g to 20j are exposed at the time of uninterruptible replacement work of a meter such as the watt-hour meter 100, Since the short-circuit prevention tool 10A is placed on the upper surface 52a of the uninterruptible replacement tool 50 and the partition portions 14h to 14j are arranged between the adjacent wires 20g to 20j, a short circuit between the exposed wires 20g to 20j is performed. Can be prevented. In addition, although the partition part 14i is provided between the wiring 20h and the wiring 20i, when the same-phase voltage is supplied to the wiring 20h and the wiring 20i, the partition part 14i may not be provided.

(Second Embodiment)
FIG. 18 is a perspective view of a short-circuit prevention tool according to the second embodiment. FIG. 19 is a schematic cross-sectional view when the short-circuit preventing tool of the second embodiment is placed on the uninterruptible replacement tool. FIG. 18 shows a perspective view of the short-circuit prevention tool 10B as viewed from below. As shown in FIG. 18, the short-circuit prevention tool 10B includes two opposing side plates 18B and 18B, two opposing side plates 19B and 19B extending in a direction crossing the side plates 18B and 18B, and side plates 18B and 18B. , 19B, 19B, and a cover plate 17B covering the space surrounded by 19B. The short-circuit prevention tool 10B has a box-like structure with the lower surface side opened.

  The short-circuit prevention tool 10B of this embodiment is used at the time of uninterruptible replacement work of a meter such as the watt hour meter 100 as shown in FIG. When the watt-hour meter 100 is removed and the plurality of wires 20a to 20f are exposed, the exposed wires 20a to 20f are covered and placed on the uninterruptible replacement tool 50 as shown in FIG. The By providing the short-circuit prevention tool 10B, the side plates 18B and 19B and the cover plate 17B cover the upper and lateral sides of the plurality of wires 20a to 20f, so that the exposed hands and tools of the plurality of wires 20a to 20f are exposed. Can be prevented from coming into contact with each other and the occurrence of a short circuit can be suppressed.

(First modification)
FIG. 20 is a perspective view of a short-circuit prevention tool according to a first modification of the second embodiment. FIG. 21 is a schematic cross-sectional view when the short-circuit preventing tool according to the first modification is placed on the uninterruptible replacement tool. As shown in FIG. 20, the short-circuit preventing tool 10C according to the first modification is provided with a plurality of partition portions 14l to 14o in a space surrounded by the side plates 18C and 19C and the cover plate 17C. The partition portions 14l to 14o are provided in parallel with the side plate 18C, and are arranged with an interval between the opposing side plates 18C and 18C. As shown in FIG. 21, the short-circuit prevention tool 10 </ b> C is placed on the uninterruptible replacement tool 50 when the watt-hour meter 100 (see FIG. 7) is removed and the plurality of wires 20 a to 20 f are exposed. The A partition 14l is disposed between the wiring 20a and the wiring 20b, and a partition 14m is disposed between the wiring 20b and the wiring 20c. Moreover, the partition part 14n is arrange | positioned between the wiring 20d and the wiring 20e, and the partition part 14o is arrange | positioned between the wiring 20e and the wiring 20f.

  The short-circuit preventing tool 10C of the first modification can prevent the operator's hand or tool from coming into contact by covering the plurality of wirings 20a to 20f with the side plates 18C and 19C and the cover plate 17C. Moreover, the short circuit of the some wiring 20a-20f accommodated in the inside of the short circuit prevention tool 10C can be prevented by providing the partition parts 14l-14o.

(Second modification)
The above-described short-circuit prevention tools 10B and 10C are used for uninterruptible replacement work of single-phase three-wire watt-hour meters, but are not limited to this, and uninterruptible replacement work of single-phase two-wire watt-hour meters. It is also applicable to. FIG. 22 is a perspective view of a short-circuit preventing tool according to a second modification of the second embodiment. The short-circuit prevention tool 10D shown in FIG. 22 has a box-like structure having side plates 18D and 19D and a cover plate 17D, similarly to the short-circuit prevention tool 10B shown in FIGS. A total of four wires (not shown) of the power supply side wires can be accommodated inside.

  The dimensions of the short-circuit prevention tool 10D can be changed as appropriate, and the length in the direction along the long side of the side plate 19D is shorter than that of the short-circuit prevention tool 10B shown in FIGS. The short-circuit prevention tool 10D is placed on the uninterruptible replacement tool 50 so as to cover four exposed wires (not shown), and can prevent short-circuiting of the wires.

(Third Modification)
FIG. 23 is a perspective view of a short-circuit prevention tool according to a third modification of the second embodiment. The short-circuit prevention tool 10E according to the third modification is provided with two partition portions 14p and 14q in a space surrounded by the side plates 18E and 19E and the cover plate 17E. The partition portions 14p and 14q are provided in parallel with the side plate 18E, and are arranged with a space between the opposing side plates 18E and 18E. The short-circuit prevention tool 10E of the third modification is used for uninterruptible replacement work of a single-phase two-wire watt-hour meter. In this case, when the watt-hour meter 100 (see FIG. 7) is removed and a plurality of wires (not shown) are exposed, the partition portion 14p is disposed between the two load-side wires, and the two power supply sides A partition 14q is arranged between the wirings.

  Thus, the short-circuit prevention tool 10E of the third modified example can prevent a short circuit between a plurality of wires arranged inside the short-circuit prevention tool 10E by arranging the partition portions 14p and 14q.

  The embodiment and each modification described above can be changed as appropriate. For example, the short-circuit prevention tool 10 according to the first embodiment may be provided with a cover plate (not shown) that covers the top of the plurality of partition portions 14a to 14f. Further, the shape, size, thickness and the like of each part of the short-circuit prevention tool 10 can be appropriately changed. For example, although the partition parts 14a-14f are made into flat form, it is not restricted to this, What is necessary is just a shape which can partition between adjacent wiring 20a-20f, such as a rod shape. The structure of the uninterruptible replacement tool 50 shown in FIGS. 7 and 8 and the connection method to the wirings 20a to 20g are not limited, and the wirings 20a to 20f can be connected in a lump, and a short-circuit prevention tool. What is necessary is just to have a surface for mounting 10.

DESCRIPTION OF SYMBOLS 10, 10A-10E Short-circuit prevention tool 12 Support part 13, 13A, 18B-18E, 19B-19E Side board 14a-14f, 14g-14o Partition part 15 Step part 16, 16A Guide 17B-17E Cover board 20a-20f Wiring 21 Covering 22 Conductor 30 Protective member 31 Magnet sheet 32 Insulating member 32a Back surface 32b Bottom 50 Uninterruptible replacement tool 51 Tool body 52 Connection portion 52a Upper surface 52b Wall portion 52c Wiring holding portion 52d Recess 55 Connection electrode 56 Through hole 57 Push screw 58 Fixed portion 59a to 59c Detection circuit 100, 100A Wattmeter 101 Main body portion 102 Terminal portion 103 Cover 106 Housing 106a Bottom plate 107a to 107f Insertion hole 111 Terminal 121 Upper tightening screw 122 Lower tightening screw

Claims (9)

A plurality of the wirings are vertically inserted on the upper surface of the uninterruptible replacement tool for electrically connecting the power supply side wiring and the load side wiring included in the plurality of wirings extending upward and connected to the instrument. A short-circuit prevention tool used for uninterruptible replacement work of the instrument in which the instrument is removed uninterrupted and a plurality of the wirings are exposed upward from the upper surface,
The short circuit prevention tool which has a side plate and the some partition part extended from one surface of the said side plate, and is mounted on the said upper surface and arrange | positioned between the said adjacent wiring.   The short-circuit prevention tool according to claim 1, further comprising a guide that extends downward from the partition portion and faces a side surface of the uninterruptible replacement tool.   The short-circuit prevention tool according to claim 1 or 2, wherein the space between the adjacent partition portions is opened upward.   The short circuit prevention tool according to claim 1, wherein a cover plate is provided above between the adjacent partition portions.   The said side plate or the said partition part is a short circuit prevention tool of any one of Claims 1-4 which have translucency.   The short circuit prevention tool according to any one of claims 1 to 5, wherein a height of the partition portion in a direction perpendicular to the upper surface is higher than a height of a portion where the wiring is exposed from the upper surface.   On the surface of the side plate opposite to the surface on which the partition portion is provided, a support portion is provided at the lower end of the side plate, and the support portion is in a direction opposite to the extending direction of the partition portion with respect to the side plate. The short-circuit prevention tool according to any one of claims 1 to 6, which extends to the top. The plurality of wirings are vertically inserted on the upper surface of the uninterruptible replacement tool for electrically connecting the power supply side wiring and the load side wiring included in the plurality of wirings extending upward and connected to the instrument. Steps,
Removing the instrument from the plurality of wires and exposing the plurality of wires upward from the top surface;
Placing the short-circuit prevention device having a side plate and a plurality of partition portions extending from one surface of the side plate on the upper surface, and disposing the partition portions between the adjacent wires; A method for preventing a short circuit. The short-circuit prevention tool has a guide that extends below the partition part and faces the side surface of the uninterruptible replacement tool,
The short circuit according to claim 8, wherein after placing the short-circuit prevention tool on the upper surface, the short-circuit prevention tool is slid toward the plurality of wires, and the partition portion is disposed between the plurality of wires. Prevention method.

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