JP2012222894A - Metal-enclosed switch gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal-enclosed switch gear that facilitates assembling operation for an inter-board bus connecting between boards to each other.SOLUTION: The metal-enclosed switch gear includes an upper-stage breaker 2 which is arranged in an upper direction in a box body 1, a lower-stage breaker 3 which is arranged in a lower direction in the box body 1, a vertical conductor 20 which connects an upper-stage lower conductor 4 of the upper-stage breaker 2 and a lower-stage upper conductor 5 of the lower-stage breaker 3 and is longitudinally arranged, and an inter-board bus 23 which is connected to an intermediate part of the vertical conductor 20, is arranged on a back side of the vertical conductor 20, and connects between boards of three phases arranged in a longitudinal array.

Description

  Embodiments of the present invention relate to a metal closed switchgear with improved assembly of main circuit conductors.

  Conventionally, in a two-stage stacked metal closed switchgear, an inter-board bus bar for connecting between boards has been arranged in a space between an upper-stage breaker and a lower-stage breaker (for example, see Patent Document 1).

  As shown in FIG. 5, this type of metal closed switchgear has an upper circuit breaker 2 disposed in the upper direction in the box 1 and a lower circuit breaker 3 disposed in the lower direction in the figure. Between the upper lower conductor 4 of the upper circuit breaker 2 and the lower upper conductor 5 of the lower circuit breaker 3, three phases are connected by the vertical conductor 6. Both ends of the vertical conductor 6 are fixed to the insulator 7, and a branch conductor 8 extending toward the front side is connected to an intermediate portion. A horizontally disposed inter-board bus bar 9 that connects between the boards is connected to the end of the branch conductor 8. That is, the inter-board buses 9 are arranged in a horizontal row in three phases from the front side to the back side, and are arranged between the upper circuit breaker 2 and the lower circuit breaker 3.

  An upper power cable 12 is connected to the upper upper conductor 10 of the upper circuit breaker 2 via a winding-type upper current transformer 11. A lower power cable 15 is also connected to the lower lower conductor 13 of the lower circuit breaker 3 via a winding-type lower current transformer 14. A control chamber 17 partitioned by a partition wall 16 is provided on the front side in the box 1. A front door 18 is provided on the front side of the control chamber 17, and a back door 19 is provided on the back side of the box 1.

  In such a box 1, the assembly of the vertical conductor 6, the branch conductor 8, the inter-board bus 9, etc. is performed by first connecting the vertical conductor 6 from the back side and then connecting the branch conductor 8 to the vertical conductor 6. Finally, the procedure is to connect the inter-board bus 9. For this reason, when assembling the branch conductor 8 and the inter-board bus 9 in the subsequent process, an assembly jig such as a torque wrench is inserted from the space between the conductors of the vertical conductors 6 for three phases and the space between the board walls. Bolts had to be tightened. Therefore, the working range is limited by the vertical conductor 6, and the field of view is obstructed, resulting in difficult assembly work. In addition, there is a partition wall 16 on the front side, and assembly work cannot be performed from the front side.

JP 2007-274861 A

  The problem to be solved by the present invention is to provide a metal closed switchgear that can facilitate the assembly work of the inter-board busbars connecting the boards.

  In order to solve the above-described problems, a metal closed switchgear according to an embodiment includes an upper circuit breaker disposed in an upper direction of a box, a lower circuit breaker disposed in a lower direction of the box, and the upper circuit breaker. A vertical conductor that connects the main circuit conductor and the main circuit conductor of the lower circuit breaker, and an inter-board busbar that is connected to an intermediate portion of the vertical conductor and connects between the boards disposed on the back side of the vertical conductor With.

The side view which shows the structure of the metal closed type switchgear which concerns on the Example of this invention. The perspective view which shows the board | substrate bus-line part of the metal closed type switchgear which concerns on the Example of this invention. The figure explaining the assembly method of the metal closed type switchgear which concerns on the Example of this invention. The top view which shows the bus | bath bus-bar of the metal closed type switchgear which concerns on the Example of this invention. The side view which shows the structure of the conventional metal closed type switchgear.

  Embodiments of the present invention will be described below with reference to the drawings.

  A metal closed switchgear according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side view showing a configuration of a metal closed switchgear according to an embodiment of the present invention, and FIG. 2 is a perspective view showing an inter-board busbar portion of the metal closed switchgear according to the embodiment of the present invention. FIG. 3 is a view for explaining a method of assembling a metal closed switchgear according to an embodiment of the present invention, and FIG. 4 is a top view showing an inter-panel bus of the metal closed switchgear according to the embodiment of the present invention. In addition, in each figure, the same code | symbol was attached | subjected about the component similar to the past.

  As shown in FIG. 1, an upper circuit breaker 2 is arranged in the upper direction in the figure and a lower circuit breaker 3 is arranged in the lower direction in the figure. Between the upper lower conductor 4 of the upper circuit breaker 2 and the lower upper conductor 5 of the lower circuit breaker 3, three phases are connected by a plate-shaped vertical conductor 20. An L-shaped upper disconnect conductor 21 and a lower disconnect conductor 22 fixed to the insulator 7 are connected to both ends of the vertical conductor 20, and are connected to the upper lower conductor 4 and the lower upper conductor 5. In the middle portion of the vertical conductor 20, three-phase inter-board buses 23 are arranged in a vertical line on the back side of the vertical conductor 20 and connected.

  The upper power cable 12 is connected to the upper upper conductor 10 of the upper circuit breaker 2 via a through-type upper current transformer 24. The lower power cable 15 is also connected to the lower lower conductor 13 of the lower circuit breaker 3 via a through-type lower current transformer 25. A control chamber 17 partitioned by a partition wall 16 is provided on the front side in the box 1. A front door 18 is provided on the front side of the control chamber 17, and a back door 19 is provided on the back side of the box 1.

  Here, the upper lower conductor 4, the upper upper conductor 10, the upper disconnect conductor 21, the lower upper conductor 5, the lower lower conductor 13, and the lower disconnect conductor 22 are simply connected to the main circuit conductors of the upper breaker 2 and the lower breaker 3, respectively. Called.

  Next, details of the inter-board bus 23 will be described with reference to FIGS.

  As shown in FIG. 2, an inter-board bus 23 in which three phases are arranged at substantially equal intervals in the vertical direction is connected to a vertical conductor 20 in which three phases are arranged vertically at substantially equal intervals in the board width direction. ing. Both ends of the inter-board bus 23 are bent in an L shape. In this case, the bus bar end 23a from one adjacent board is located on the back side with the vertical conductor 20 as a boundary, and the bus bar end 23b from the other board is located on the front side. That is, the bus bar ends 23 a and 23 b are arranged so as to sandwich the vertical conductor 20. The inter-board bus bar 23 passes through the opening of the inter-board wall 26.

  As shown in FIG. 3, the connecting operation of the bus bar ends 23a and 23b is performed in the work space on the back side, and the bolts 27 are passed through the bus bar end 23b located on the front side, and the bus bar end located on the back side. The nut 28 is tightened from 23a. As shown in FIG. 4, the bus bar end 23 b arranged on the front side is provided with a square through hole 29, and the handle portion that also penetrates the bolt 27 has a square shape. The bus bar end 23 a disposed on the back side is a circular through hole 30.

  As a result, the tightening operation of the bolt 27 and the nut 28 becomes only one-side tightening of the nut 28 on the back surface side, and the assembling operation becomes easy. The handle portions of the through holes 29 and the bolts 27 may be triangular or more polygonal or elliptical.

  In addition, since the inter-board bus 23 is positioned on the back side and the three phases are arranged in a vertical row, a work space can be secured on the back side, and assembly work can be facilitated. The inter-board bus 23 for each phase is horizontally arranged.

  Moreover, since the upper stage upper conductor 10 and the lower stage lower conductor 13 are directly connected to the main circuit conductor fixed to the current transformers 24 and 25, the number of parts can be reduced.

  According to the metal closed type switchgear of the above-described embodiment, the inter-board bus 23 connecting the boards is positioned on the back side, and one bus end 23a and the other bus end 23b are arranged so as to sandwich the vertical conductor 20. Since the bolts 27 are penetrated from the front side and the nuts 28 are tightened on the back side, the assembling work can be facilitated.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof 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 1 Box body 2 Upper stage circuit breaker 3 Lower stage circuit breaker 4 Upper stage lower conductor 5 Lower stage upper conductor 6, 20 Vertical conductor 7 Insulator 8 Branching conductor 9, 23 Inter-board bus 10 Upper stage upper conductor 11, 14, 24, 25 Current transformer 12 , 15 Power cable 13 Lower lower conductor 16 Bulkhead 17 Control room 18 Front door 19 Rear door 21 Upper disconnect conductor 22 Lower disconnect conductors 23a, 23b Bus end 26 Panel wall 27 Bolt 28 Nut 29, 30 Through hole

Claims (5)

An upper breaker placed in an upward direction in the box,
A lower circuit breaker disposed in a downward direction of the box,
A vertical conductor connecting the main circuit conductor of the upper circuit breaker and the main circuit conductor of the lower circuit breaker;
A metal-closed switchgear that is connected to an intermediate portion of the vertical conductor and includes an inter-board bus bar that connects between the boards arranged on the back side of the vertical conductor. Both ends of the inter-board busbars are busbar ends bent in an L shape,
Place the busbar end from one board on the back side of the vertical conductor,
2. The metal closed switchgear according to claim 1, wherein a bus bar end from the other board is disposed on the front side of the vertical conductor.   The metal closed switchgear according to claim 1 or 2, wherein three-phase portions of the inter-board buses are arranged in a vertical row. The through hole at the bus bar end of the inter-board bus located on the front side of the vertical conductor is polygonal,
The metal closed switchgear according to any one of claims 1 to 3, wherein a handle portion of the bolt passing through the through hole is also polygonal.   The metal closed switchgear according to any one of claims 1 to 4, wherein main circuit conductors of the upper circuit breaker and the lower circuit breaker are connected to a main circuit conductor of a current transformer.

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