JP2011024339A - Bus supporting device and switchgear using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bus supporting device in which a height or depth dimension of a housing is made compact and improvement in the strength of the housing which corresponds to electromagnetic force between buses due to three-phase short-circuit current of the bus is not necessary to be taken into account, and to provide a switchgear that uses the device. <P>SOLUTION: The bus support device 1 is constituted to arrange and support the buses 2 of three-phases at the positions of apexes of a triangle. The device is constituted of a support member 3, formed of an insulator such as a molding of epoxy resin. Thus, the respective phases of the buses 2 are linearly supported by the support member 3 formed of the insulator. The support member 3 is constituted of a member, having strength which withstands the strength of the electromagnetic force acting on the mutual buses 2 by the three-phase short-circuit current. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a busbar support device housed in a switchgear such as a switchboard or a switchgear and a switchgear using the busbar support device.

  In general, the inside of a switchgear housing such as a switchboard or switchgear is composed of a control room, a circuit breaker room, a busbar room, and a cable room. The three-phase buses are arranged in a horizontal, vertical, triangular, etc., when viewed from the side of the casing, taking into account the height or depth of the busbar room due to restrictions on the equipment to be accommodated, conductors, and the like. In that case, the three-phase buses are fixed for each phase with a supporting insulator and an insulator frame, and the bus bars to the circuit breaker terminals are connected with branch conductors (see, for example, Patent Document 1 and Patent Document 2).

JP 2006-191740 A (summary column, FIG. 1) Japanese Utility Model Publication No. 1-61804 (page 4, line 4 to line 10)

  However, in the conventional method for supporting a three-phase bus in a switchgear, it is necessary to consider the strength of the electromagnetic force between the buses due to the three-phase short-circuit current flowing in the bus when the casing is viewed from the strength aspect. Generally, the electromagnetic force due to the short circuit current is much larger than the weight of the bus bar. When the bus bar is supported by the insulator, there is a force acting in the bending direction of the insulator, and the supporting insulator needs to withstand the force acting in the bending direction. In addition, strength is also required for the insulator frame or casing for fixing the supporting insulator.

  Regarding the size of the switchgear housing, the height of the housing is reduced when the busbar is horizontally arranged, but the depth dimension is increased, and vice versa when the busbar is arranged vertically. . Furthermore, when the bus bar is arranged at the position of the apex of the triangle when viewed from the side of the housing, it is necessary to attach a supporting insulator or an insulator frame for each phase, and the depth dimension becomes large.

  The present invention has been made to solve the above-described problems. The height or depth of the housing is made compact, and the housing is compatible with the electromagnetic force between the buses due to the three-phase short-circuit current of the bus. An object of the present invention is to obtain a busbar support device that does not require an improvement in strength and a switchgear using the busbar support device.

  The busbar support device according to the present invention includes a support member that supports each busbar by arranging a plurality of busbars at each vertex of the triangle, and the support member is made of an insulator and has an axis between the busbars. Each bus bar is supported by rod-shaped insulators, and the rod-shaped insulators are integrally connected to form a triangular insulating support.

  According to the present invention, the support member is provided that supports the bus bars by arranging a plurality of bus bars at the positions of the respective apexes of the triangle, and the support member is made of an insulator and has a rod-like insulation having an axis between the bus bars. The body is supported between the bus bars, and the rod-shaped insulators are joined together to form a triangular insulating support body, so the height or depth of the housing is reduced, and the three-phase short-circuit current of the bus bars Thus, it is possible to obtain a busbar support device that does not need to consider the strength improvement of the housing corresponding to the electromagnetic force between the busbars.

It is a side view of the bus-bar support apparatus by Embodiment 1 of this invention. It is AA sectional view taken on the line of the bus-bar support apparatus shown in FIG. It is the BB line and CC line sectional drawing of the bus-line support apparatus shown in FIG. It is a principal part enlarged view of the bus-line support apparatus shown in FIG. It is the figure which looked at FIG. 4 from the arrow D direction. It is a side view of the bus-bar support apparatus by Embodiment 2 of this invention. It is side surface sectional drawing of the switchgear 1 circuit by Embodiment 3 of this invention. It is side surface sectional drawing of the switchgear 1 circuit of the conventional triangular arrangement | positioning bus-line. It is side surface sectional drawing of the switchgear 1 circuit of the conventional horizontal arrangement | positioning bus-line. It is side surface sectional drawing of the switchgear 1 circuit of the conventional vertical arrangement | positioning bus-line. It is side surface sectional drawing of the switchgear by Embodiment 4 of this invention. It is side surface sectional drawing of the switchgear by Embodiment 5 of this invention.

  Preferred embodiments of a busbar support device and a switchgear using the same according to the present invention will be described below with reference to the accompanying drawings. Note that the present invention is not limited to these embodiments.

Embodiment 1 FIG.
1 is a side view of a busbar support device according to Embodiment 1 of the present invention. The bus support device 1 is configured to place and support a three-phase bus 2 at the position of the apex of a triangle. And it is comprised by the supporting member 3 which consists of insulators, such as a molded article of an epoxy resin. As a result, the phases of the bus 2 are linearly supported by the support member 3 made of an insulator. Moreover, the support member 3 is comprised with the member which has the intensity | strength which can endure the intensity | strength of the electromagnetic force which works between the buses 2 by a three-phase short circuit current. In order to fix the busbar support device 1 to a housing (not shown), a part of the support member 3 is extended in the vertical direction in FIG. 1 so as to satisfy the minimum insulation distance between the busbar 2 and the ground. . A plurality of protruding interphase barriers 4 are formed on the surface of the support member 3 to ensure a creepage distance necessary for maintaining the insulation distance L.

  2 is a cross-sectional view taken along line AA of the busbar support device shown in FIG. 1, and FIG. 3 is a cross-sectional view taken along lines BB and CC of the busbar support device shown in FIG. As shown in FIGS. 1, 2, and 3, the support member 3 is a bar-shaped insulator having a rectangular cross section with a long surface to which the bus bar 2 is attached. Each axis of the bar-shaped insulator is between each bus bar 2. Is intervening.

  FIG. 4 is an enlarged view of a main part of the busbar support device 1 shown in FIG. Here, the connection state of the bus-bar support apparatus 1 and the housing | casing 5 which were abbreviate | omitted in FIG. 1 is shown. FIG. 5 is a view of FIG. 4 as viewed from the direction of the arrow D. As shown in FIG. 5, the housing frame 5a is provided horizontally in the width direction of the housing 5, and has a protruding portion 5b protruding downward in part. The end of the support member 3 is screwed to the protruding portion 5b of the housing frame 5a. On the other hand, the bus 2 is arranged in parallel with the housing frame 5 a and is screwed to the support member 3.

  As described above, the busbar support device 1 according to the first embodiment supports the electromagnetic force acting between the busbars 2 collectively by the support member 3, and therefore does not need to be fixed for each phase, and the number of parts is also increased. As a result, assembly workability is improved.

  Moreover, according to this bus-bar support apparatus 1, since the electromagnetic force which acts between the bus-bars 2 acts linearly in the direction in which the support member 3 is interposed, the force acting in the bending direction is reduced. Therefore, it is not necessary to endure the bending direction, and the strength of the busbar support device 1 and the housing can be reduced.

  Further, if the bus bar supporting device 1 is housed in the switchgear housing, it is not necessary to consider the strength corresponding to the electromagnetic force acting between the busbars 2 on the housing. Therefore, the thickness of the members constituting the housing can be reduced to reduce the weight, which is advantageous in terms of workability and economy during transportation.

  Further, since the bus bar 2 can be arranged in the bus bar room so as to extend in the horizontal direction at the apex of the triangle when viewed from the side of the casing, the height dimension of the casing can be reduced and the depth dimension can be reduced. Can also be reduced. Therefore, the casing size of the switch gear can be reduced, and the carrying-in performance is improved by satisfying the dimensional restrictions such as transportation and the electric room. In addition, the construction period can be shortened or construction costs can be reduced.

Embodiment 2. FIG.
Next, a second embodiment will be described. FIG. 6 is a side view of a busbar support device according to Embodiment 2 of the present invention. The arrangement of the busbar support device 1 that supports the busbar 2 in the switchgear housing varies depending on the housing configuration. As shown in FIGS. The supporting member 3 may be extended in the vertical direction or the horizontal direction from the position of each vertex of the triangle as viewed to support the bus 2. Moreover, you may make it extend toward a housing | casing, satisfying the insulation distance between grounds from between the positions of each vertex.

Embodiment 3 FIG.
Next, a switchgear using the busbar support device according to the first embodiment or the second embodiment will be described as a third embodiment. FIG. 7 shows a side sectional view of a switchgear using the busbar support device according to the first embodiment as a representative, and a state where one circuit composed of the busbar, the circuit breaker, the current transformer, and the conductor is housed in the housing FIG. In FIG. 7, the bus 2, the circuit breaker 6, the current transformer 7, and the circuit breaker 6 and the current flow supported by the bus bar supporting device 1 inside the housing 5 having a height dimension of H1 and a depth dimension of D1. A conductor 8 for connecting the container 7 is accommodated. The current transformer 7 is connected to an external device (not shown) by a cable 11 supported by an insulator 9 and an insulator frame 10 that fixes the insulator 9. In addition, the bus 2 is supported by the bus support device 1 with a minimum insulation distance a and b between each phase and the ground, and is stored in the bus chamber 12. The bus 2 and the circuit breaker 6 are connected by a branch conductor 13.

  As shown in FIG. 7, the switchgear according to the third embodiment is arranged such that the busbar 2 is arranged at the apex of the triangle when viewed from the side of the casing, and withstands electromagnetic force acting between the busbars due to the three-phase short circuit current between the phases. It is supported by a busbar support device 1 composed of a support member 3 having sufficient strength. Therefore, the conventional switchgear in which the bus 2 shown in FIG. 8 is arranged at the apex of the triangle has the following characteristics.

  That is, in the conventional switchgear shown in FIG. 8, the bus 2 of each phase arranged at the position of the apex of the triangle when viewed from the side of the housing is fixed by the support insulator 9 and the insulator frame 10. Other configurations are the same as those in FIG. Comparing the conventional switchgear shown in FIG. 8 with the switchgear of the third embodiment shown in FIG. 7, the switchgear of the third embodiment has a smaller depth dimension corresponding to the dimension 2c of the insulator frame 10. . In FIG. 8, H <b> 2 indicates the height dimension of the casing 1, and D <b> 2 indicates the depth dimension of the casing 1.

  Compared with the conventional switchgear in which the busbar 2 shown in FIG. 9 is horizontally arranged, the switchgear of the third embodiment has a height dimension that is larger by the height of one conductor of the busbar 2, but the depth dimension. Becomes smaller by the insulation distance b between the phases. In FIG. 9, H <b> 3 indicates the height dimension of the casing 1, and D <b> 3 indicates the depth dimension of the casing 1.

  Further, when compared with the conventional switchgear in which the busbar 2 shown in FIG. 10 is arranged vertically, the switchgear of the third embodiment has the same depth dimension, but the height dimension is the insulation distance b between the phase and the busbar 2. It becomes smaller by the height of one conductor. In FIG. 10, H4 indicates the height dimension of the casing 1 and D4 indicates the depth dimension of the casing 1.

  In summary, the height dimension is H3 <H1 = H2 <H4 and the depth dimension is D1 = D4 <D2 <D3. Therefore, when the busbar support device 1 of the first embodiment is used, the switchgear can be made compact. It is understood that it is effective.

Embodiment 4 FIG.
Next, a fourth embodiment will be described. FIG. 11 is a side sectional view of a switchgear according to the fourth embodiment, showing a switchgear having a double busbar structure. In the switchgear according to the fourth embodiment, the busbar chamber 12 is arranged at the top and bottom of the center of the housing 5. The bus 2 is connected to the upper terminal of the upper circuit breaker 2 and the lower terminal of the lower circuit breaker 2 by branch conductors 13 respectively. Since the busbars 2 are arranged in a triangle and are fixed by the busbar support device 1, the height dimension and the depth dimension are reduced, and the same effect as the switchgear of the first embodiment can be obtained.

Embodiment 5 FIG.
Next, a fifth embodiment will be described. FIG. 12 is a side sectional view of the switchgear according to the fifth embodiment and is a diagram showing the switchgear of the bus bar conversion board. In the switchgear according to the fifth embodiment, the bus bar chamber 12 is arranged at the upper center of the housing 5. The central bus 2 is arranged vertically assuming that two-tiered boards are arranged. The lower terminal of the circuit breaker 6 and the bus 2 are connected by a branch conductor 13. The bus bar 2 on the upper panel is arranged in a triangle, and the upper terminal of the circuit breaker 6 arranged on the upper panel and the bus 2 are connected by a branch conductor 13. The upper bus 2 may be arranged in the lower stage. Also in the switchgear according to the fifth embodiment, the same effect as that of the switchgear of the first embodiment can be obtained.

DESCRIPTION OF SYMBOLS 1 Busbar support apparatus 2 Busbar 3 Support member 4 Interphase barrier 5 Case 5a Case frame 5b Projecting part 6 Circuit breaker 7 Current transformer 8 Conductor 9 Insulator 10 Insulator frame 11 Cable 12 Busbar chamber 13 Branch conductor

Claims (4)

A bus support device for supporting a plurality of buses,
A support member that supports each of the buses by arranging the plurality of buses at the position of each vertex of the triangle,
The support member is made of an insulator, supports each bus bar with a bar-shaped insulator having an axis between the bus bars, and integrally connects the bar-shaped insulators to form a triangular insulating support body. Busbar support device.   The bus support device according to claim 1, wherein the support member interposed between the buses is integrally formed.   The bus support device according to claim 1 or 2, wherein the plurality of bus bars are arranged at positions of respective vertices of a right triangle.   A switchgear comprising a busbar chamber, wherein the busbar support device according to any one of claims 1 to 3 is housed in the busbar chamber.

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