JP2014230355A - Switch board facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switch board facility which enables cable bending operation and direct joint work for extension of the cable to be omitted and thereby simplifies cable processing work.SOLUTION: A switch board facility includes: a switch board 11 provided with an electric device 14; and a cable pit 12 formed at an installation position of the switch board 11. A conductor 15 which is provided in the switch board 11 and has one end connected with the electric device is disposed so that the other end of the conductor 15 reaches the cable pit 12. A connection device 13 connects one end of a cable 18 installed in the cable pit 12 with the other end of the conductor 15 in the cable pit 12.

Description

  Embodiments of the present invention relate to a distribution board facility that uses a cable to pull in or send out a main circuit.

  In general, a conventional high-voltage switchboard has a cable connection portion provided in the panel. In this case, the cable is raised from a cable pit formed at a place where the board is installed, drawn into the board, and its terminal is connected to a cable connecting portion provided in the board. Moreover, ZCT is provided in the board, and the cable drawn into the board is configured in a state where three phases (three wires) penetrate the common ZCT (see, for example, Patent Document 1).

JP 2000-125421 A

  In such a conventional switchboard, when connecting the cables, the cables arranged in the horizontal direction in the lower cable pit must be bent in a substantially vertical state toward the board. As is well known, since the cable has a structure in which an insulation coating is provided around the conductor, the cable has considerable rigidity and requires a lot of labor for bending work. Further, the cable bending operation must be bent with a relatively large radius of curvature because of the relatively large rigidity described above. For this reason, structural constraints are imposed on the shape of cable pits and switchboards, the position of ZCT, and the like.

  Since the cables drawn into the panel cannot be processed after the three phases have passed through the ZCT, the terminal processing work takes time and effort. In particular, when an existing cable is used to update a distribution board, when the cable is disconnected from the distribution board before the update, the cable terminal unit and the ZCT may interfere with each other and the cable may not be removed. In this case, the terminal portion of the cable was cut and the ZCT was removed. However, even after trying to use a cable with this terminal section cut after the panel update, the cable length is often insufficient due to the cut, and a cable direct joint operation is required to secure the cable length, etc. There was a problem.

  In this way, in the structure in which the load cable is connected in the panel, the cable is drawn into the panel while securing the diameter of the cable, and after passing through the ZCT in the panel, terminal processing is performed, and a predetermined connection location is obtained. Must be connected to. This required a lot of work time and caused structural constraints. Therefore, when a high-voltage switchboard is newly installed or updated, it has been desired to reduce the work required for cable connection and shorten the construction work time.

  It is an object of the present invention to provide a switchboard equipment that can omit a cable bending treatment and a direct joint operation for wire drawing and simplify the cable processing operation.

  The switchboard equipment according to the embodiment of the present invention includes a switchboard in which electrical equipment is provided, a cable pit formed at a place where the switchboard is installed, and one end connected to the electrical equipment. The other end includes a conductor that reaches into the cable pit, and a connection device that connects the one end of the cable installed in the cable pit and the other end of the conductor in the cable pit. And

  According to the embodiment of the present invention, the cable processing work required for the conventional panel can be greatly simplified by connecting the cables in the cable connection box outside the panel.

It is a side view explaining the structure of the switchboard equipment which concerns on one embodiment of this invention. FIG. 2 is a partial rear view of FIG. 1. It is a perspective view which shows the structural example of the connection apparatus used for one embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a side structure of a distribution board facility according to this embodiment. The distribution board equipment includes a distribution board 11, a cable pit 12 formed at an installation location of the distribution board 11, and a connection device 13 installed in the cable pit 12. The switchboard 11 is provided with an electrical device 14 such as a circuit breaker, and one terminal of the switchboard 11 is one end (upper end in the figure) of a connection conductor 15 arranged vertically on the back side (right side in the figure). Connected. As shown in FIG. 2, the conductor 15 has three phases arranged in parallel, and a conductor-connected winding type ZCT 16 is connected to the middle portion in the longitudinal direction as shown in FIG. . Further, the other end (lower end in the figure) of the conductor 15 reaches the connection device 13 in the cable pit 12. In addition, the other terminal of the electric equipment 14 in the switchboard 11 is connected to a horizontal bus or the like (not shown).

  In the cable pit 12, the connecting device 13 connects one end of the cable 18 laid in the cable pit 12 and the other end (lower end in the drawing) of the conductor 15 described above. As shown in FIG. 3, the connection device 13 includes a connection box 20 formed in a box shape by an insulating material. On the upper surface of the connection box 20, a conductor drawing portion 21 for drawing the lower end of the conductor 15 in the vertical direction is formed, and on the side surface, a cable drawing portion 22 for drawing the end portion of the cable 18 in the horizontal direction is formed. These lead-in portions 21 and 22 are provided with a structure and a waterproofing treatment to prevent foreign objects such as small animals from entering the pull-in opening. Further, near the conductor lead-in portion 21, a working opening 23 that is normally covered with a lid is preferably provided.

  A support insulator 25 is provided in the connection box 20. The support insulator 25 is made of an insulator such as porcelain or rubber material, and supports and fixes a connection portion between the illustrated lower end of the conductor 15 and the end portion of the cable 18. Here, the lower end of the conductor 15 shown in the figure is bent substantially at a right angle as shown in the figure, and is configured so that it can be connected integrally with a connection terminal 18a provided at the end of the cable 18 by a fastening tool such as a bolt / nut.

  In the above configuration, the connection conductor 15 in the switchboard 11 and the external cable 18 are connected in the connection box 20 of the connection device 13 provided in the cable pit 12. That is, the end of the cable 18 laid in the cable pit 12 in the horizontal direction is pulled into the connection box 20 without being bent. Similarly, the conductor 15 is drawn vertically from the inside of the switchboard 11, and the lower end of the conductor 15 is connected to the connection terminal 18 a of the cable 18 and fixed on the support insulator 25. In this case, the lower end portion of the conductor 15 can be previously bent at a right angle, and the cable 18 can be used in which the connection terminal 18a is attached to the tip portion in advance. This eliminates the need for cable bending work and cable terminal processing after penetrating the ZCT, as in the case of connecting cables in a conventional panel, and the work at the time of installing the switchboard 11 becomes much easier. Time is shortened.

  Further, when the distribution board is updated by diverting the existing cable, even if the cable is cut and the ZCT is removed, the cut cable can be diverted as it is. That is, since the connection process is performed in the connection box 20 in the cable pit 12, even if the cable is cut in the switchboard, the cable length is not short. Therefore, the cable can be used as it is without requiring a direct joint operation. In other words, the main circuit cable must be cut and re-terminated at the time of renewal, but it is not necessary to perform a bending treatment for accommodating the cable 18 in the panel or a direct joint for wire drawing. Therefore, the cable processing work can be simplified even in the update work, and the work time can be shortened.

  Thus, since the connection conductor 15 in the switchboard 11 engages with the high voltage cable 18 in the connection box 20 of the connection device 13 installed in the cable pit 12, the connection conductor 15 is pulled out vertically in the switchboard 11. It can be. And it can connect with the terminal 18a of the cable 18 on the support insulator 25 in the connection box 20. FIG. For this reason, since the space which accommodates a cable in a switchboard becomes unnecessary, the depth dimension can also be made small.

  Although an embodiment of the present invention has been described, this embodiment is presented as an example and is not intended to limit the scope of the invention. The novel embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 11 ... Distribution board 12 ... Cable pit 13 ... Connection apparatus 14 ... Electrical equipment 15 ... Conductor for connection 18 ... Cable 20 ... Connection box 21 ... Conductor lead-in part 22 ... Cable lead-in part 25 ... Support insulator

Claims (2)

A switchboard with electrical equipment inside;
A cable pit formed at the installation location of this switchboard,
Provided in the switchboard, one end is connected to the electrical equipment, the other end is a conductor reaching the cable pit,
In the cable pit, a connection device for connecting one end of a cable laid in the cable pit and the other end of the conductor;
Power distribution board equipment characterized by comprising. The connecting device is
A connection box formed of an insulating material in a box shape, a conductor lead-in portion for pulling the other end of the conductor vertically in the upper surface thereof, and a cable lead-in portion for pulling the end portion of the cable laterally formed on the side surface; ,
A support insulator provided in the connection box for supporting and fixing a connection portion between the other end of the conductor and an end portion of the cable;
The switchboard equipment according to claim 1, further comprising:

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