JP4852109B2 - Switchgear - Google Patents

Description

  The present invention relates to a switch gear in which a circuit breaker is housed in a casing.

  A conventional switchgear of this type includes a circuit breaker chamber that houses a circuit breaker, a cable chamber that is placed behind the circuit breaker chamber and that accommodates a cable connected to a load, and a power supply that is arranged above the cable chamber. And a main bus room for storing the main bus connected to the chamber, and these chambers are partitioned by a partition plate. The three-phase buses housed in the main bus room are arranged in parallel to the horizontal direction with a space in the vertical direction on the side surface of the same partition plate. The connection between the circuit breaker and the cable housed in the cable chamber is made by a load-side connection conductor. This branch conductor is connected from the connection position with the load-side terminal provided below the circuit breaker to the rear of the circuit breaker. In order to secure a connection distance with the cable, the cable is once extended upward and then connected to the cable (see, for example, Patent Document 1).

JP 2004-350442 A

  Since the conventional switchgear configured as described above has the main busbars of the respective phases arranged in parallel in the horizontal direction with vertical intervals, the main busbar room for storing the main busbars is the main busbar. Vertical predetermined dimensions are required for the arrangement. Therefore, in order to suppress the vertical dimension of the switchgear casing, the circuit breaker placed below the main busbar must be installed near the floor of the casing, To perform work such as inspection and wiring in the cable room where it is located, the cable room cannot be accessed even if the circuit breaker is removed from the floor of the chassis. It needs to be done from the rear side, and it takes time. In addition, if the circuit breaker is installed near the middle stage of the casing in consideration of workability such as inspection, there is a problem that the vertical dimension of the casing becomes large.

  The present invention has been made to solve the above-described problems in conventional switch gears, and is excellent in workability such as inspection and wiring without increasing the dimensions of the switch gear housing. An object is to provide a switchgear.

The switchgear according to the present invention includes a main bus chamber for storing a three-phase main bus connected to a power source, a cable chamber for storing a cable connected to a load provided on the lower side in the vertical direction of the main bus chamber, A switchgear having a housing having a circuit breaker chamber that houses a circuit breaker that is electrically connected to the main bus and the cable and opens and closes an electric path from the power source to the load, A first wall positioned between the main bus chamber and the circuit breaker chamber and substantially perpendicular to the main bus chamber, and facing the first wall through an internal space of the main bus chamber; A second wall constituting a part of the main bus room and a part of the main bus room located between the main bus room and the cable room, and from the second wall side to the first wall side a third wall having an inclined portion extending obliquely downwardly to the breaker chamber and the front Between the main busbar room, and located between the circuit breaker compartment and the cable compartment, and a fourth wall which is connected to said first wall and said third wall, Each of the three-phase main buses includes a first main bus, a second main bus, and a third main bus arranged in parallel and extending in the horizontal direction, and the first main bus is The first main bus bar is fixed to the first wall body, and the second main bus bar is at least partially overlapped with the first main bus bar in a horizontal direction through an internal space of the main bus chamber. And the third main bus bar is positioned below the second main bus bar and fixed to the second wall body, and the third main bus bar is fixed to the second wall body. breaker chamber is disposed in the horizontal direction toward the front side of the housing with respect to said cable chamber and the main bus chamber, said fourth wall, said fourth wall With through fixing the power supply side bushing which is arranged across said main bus chamber and the breaker chamber, the positioned lower with respect to the power source side bushing through said fourth wall A load-side bushing disposed across the circuit breaker chamber and the cable chamber is fixed, and the power-side bushing is fixed on the power supply side, one end of which is positioned below the main busbar and protrudes into the main busbar chamber The load-side bushing includes a load-side fixed terminal with one end protruding into the cable chamber, and the circuit breaker is provided on the power-source side so as to be able to contact with and separate from the other end of the power-source-side fixed terminal. And a load side terminal provided so as to be able to contact with and separate from the other end of the load side fixed terminal, wherein the main bus line is connected to the power source via a power source side connection conductor disposed in the main bus room. Connected to one end of the side fixed terminal The cable is connected to one end of the load side fixed terminal via a load side connection conductor disposed in the cable chamber, and the load side connection conductor has one end connected to the load side fixed terminal and the third side. An inclined extending portion extending substantially parallel to the inclined portion of the wall, and a vertical extending portion extending in the vertical direction and having one end connected to the other end of the inclined extending portion and the other end connected to the cable. It is characterized by having.

According to the switchgear according to the present invention, the casing of the switchgear is located between the main wall chamber and the circuit breaker chamber and is substantially perpendicular to the first wall body and the internal space of the main busbar chamber. A second wall that faces one wall and forms a part of the main bus room, and a part of the main bus room located between the main bus room and the cable room; A third wall having an inclined portion extending downwardly from the body side to the first wall side , the circuit breaker chamber and the main bus chamber, and the circuit breaker chamber and the cable chamber; A first wall body and a fourth wall body connected to the third wall body, wherein the main bus bar of at least one phase of the plurality of phase main bus bars is substantially horizontally directed to the first wall body Since the main bus bar of the other phase is fixed to the second wall body so as to extend substantially in the horizontal direction, the main mother body fixed to the first wall body is fixed. The main bus of at least one of the main buses and the main bus of at least one of the main buses fixed to the second wall body are arranged to face each other so that at least a part thereof overlaps in the horizontal direction. Thus, the space in the casing can be increased without increasing the vertical dimension of the casing of the switch gear, and a switch gear excellent in workability such as inspection and wiring can be obtained.

It is sectional drawing of the switchgear by Embodiment 1 of this invention. It is explanatory drawing for demonstrating arrangement | positioning of the main bus line of the switchgear by Embodiment 1 of this invention. It is explanatory drawing for demonstrating the main bus-chamber and its vicinity of the switchgear by Embodiment 1 of this invention. It is explanatory drawing for demonstrating the cable chamber and its vicinity of the switchgear by Embodiment 1 of this invention.

Embodiment 1 FIG.
1 is a cross-sectional view of a switchgear according to Embodiment 1 of the present invention, FIG. 2 is an explanatory diagram for explaining the arrangement of main busbars of the switchgear according to Embodiment 1 of the present invention, and FIG. FIG. 4 is an explanatory diagram for explaining the main bus chamber of the switch gear and its vicinity according to Embodiment 1 of the invention, and FIG. 4 is an explanation for explaining the cable chamber of the switch gear and its vicinity according to Embodiment 1 of the present invention. FIG.

  1 to 4, the switchgear 1 includes a substantially box-shaped housing 100 made of metal, and inside the housing 100, a circuit breaker chamber 20 that houses a drawer-type circuit breaker 202, A main bus chamber 30 for housing a first phase main bus 301, a second phase main bus 302, a third phase main bus 303 connected to a three-phase power source, and a first phase cable 403 connected to a load. A cable chamber 40 for storing the second-phase cable 404 and the third-phase cable 405 and a control chamber 50 for storing a protection relay, a meter and the like (not shown) are provided. A circuit breaker chamber door 201, a cable chamber door 401, and a control chamber door 501 that can be opened and closed are provided in front of the circuit breaker chamber 20, the cable chamber 40, and the control chamber 50, respectively.

  The circuit breaker chamber 20 is partitioned from the main bus chamber 30 and the cable chamber 40 by metal partition plates 101 and 104 having substantially vertical wall surfaces. The circuit breaker chamber 20 includes a circuit breaker support 205 that supports the drawer-type circuit breaker 202 at a substantially middle portion in the vertical direction of the casing 100. The circuit breaker support 205 also serves as a partition between the circuit breaker chamber 20 and the cable chamber 40.

  The drawer type circuit breaker 202 housed in the circuit breaker chamber 20 is installed on the circuit breaker support 205 via a plurality of wheels 203 and 204. The pull-out type circuit breaker 202 has a power supply side terminal (only one pole is shown in FIG. 1) 207 and a load side terminal (only one pole is shown in FIG. 1) 208 of each of the three phases. A three-phase vacuum switch (not shown) is connected in series between these terminals 207 and 208.

On the partition plate 104 , power supply side fixing terminals (shown in FIG. 1) are respectively provided at positions facing the power supply side terminals 207 of the three-phase poles of the drawer type circuit breaker 202 via bushings (only one phase is shown in FIG. 1 is displayed only for one phase), and the bushing is fixed at the position opposite to the load-side terminal 208 of each of the three-phase poles of the drawer type circuit breaker 202 (only one phase is displayed in FIG. 1). A load side fixed terminal 2012 (only one phase is shown in FIG. 1) 2012 is fixed via 2014.

  The pull-out type circuit breaker 202 rotates the screw 206 with a handle (not shown) to move the pull-out type circuit breaker 202 leftward from the state shown in FIG. 1, and the power supply side terminal 207 and the load side terminal 208 are connected to the power supply. It can be detached from the side fixing terminal 2011 and the load side fixing terminal 2012. Further, the drawn-type circuit breaker 202 in the drawn-out state is moved in the right direction in the figure by rotating the screw 206 in the opposite direction to the above, and the power-side terminal 207 and the load-side terminal 208 correspond respectively. The power supply side fixed terminal 2014 and the load side fixed terminal 2012 can be connected.

  Each phase power supply side shutter 209 provided corresponding to each phase power supply side fixed terminal 2011 and each phase load side shutter 210 provided corresponding to each phase load side fixed terminal 2012 are drawn out. When the circuit breaker 202 is pulled out to the left in the figure, the openings of the respective bushings 2013 and 2014 are closed, and the power supply side fixed terminal 2011 and the load side fixed terminal 2012 of each phase are exposed in the circuit breaker chamber 20. Shield not to. Each of the power supply side shutter 209 and the load side shutter 210 is constituted by a shielding plate integrally formed for three phases so as to collectively shield terminals for three phases.

  The three-phase main buses 301, 302, and 303 housed in the main bus chamber 30 are each composed of a rectangular conductor, and among these main buses, the first-phase main bus bar 301 is an insulator on the wall surface of the partition plate 101. It is fixed to extend in the horizontal direction via 304. Further, the second-phase main bus 302 and the third-phase main bus 303 are arranged on the wall surface of a metal partition plate 102 having a substantially vertical wall surface that partitions the main bus chamber 30 and the cable chamber 40, and insulators 305 and 306. The third-phase main bus 303 is disposed below the second-phase main bus 302 at a predetermined interval in the vertical direction with respect to the main bus 302 of the second phase. . The first phase main bus 301 fixed to the partition plate 101 and the second phase main bus 302 fixed to the partition plate 102 are opposed to each other through the space in the main bus chamber 30 and are perpendicular to each other. Since they are fixed at the same position, they are arranged so as to overlap each other in the horizontal direction.

  Further, in the main bus chamber 30, the power supply side connection conductors 3011, 3021, which are flat conductors for connecting the main bus lines 301, 302, 303 of each phase and the power supply side fixed terminals 2011 of the respective phases corresponding thereto, respectively. 3031 is stored. These power supply side connection conductors 3011, 3021, and 3031 are fixed to the partition plate 101 via insulators (only one phase is shown in FIG. 1) 307.

  The metal partition plate 103 is provided between the main bus room 30 and the cable chamber 40, and one end is connected to the partition plate 102, and is inclined downward from the partition plate 102 side to the partition plates 101 and 104 side. And an inclined portion 1031 extending in the direction. The other end side of the partition plate 103 is connected to the partition plate 104. In addition, you may comprise the partition plates 102 and 103 by an integral metal plate.

In Embodiment 1 of the present invention, the partition plate 101 constitutes a first wall body, the partition plate 102 constitutes a second wall body, the partition plate 103 constitutes a third wall body , The partition plate 104 constitutes a fourth wall body .

  The three-phase cables 403, 404, and 405 housed in the cable chamber 40 are connected to a load (not shown) and enter the cable chamber 40 from through holes provided in the floor surface 411 of the switchgear housing 100. It is introduced and supported by a cable support (only one phase is shown in FIG. 1) 409. These phase cables 403, 404, and 405 are respectively connected to load-side connection conductors 481, 482, and 483 of each phase that are formed by flat conductors via cable terminals (only one phase is shown in FIG. 1) 406. It is connected. The load side connection conductors 481, 482, 483 of each phase are connected to the load side fixed terminals 2012 of the corresponding phases, respectively.

  The load-side connection conductors 481, 482, 483 of each phase are fixed to the inner wall of the housing 100 by insulators 471, 472, 473, and the vertical extending portions 4811, 4821, 4831 extending in the vertical direction and the inclination of the partition plate 103 An inclined extending portion (only one phase is shown in FIG. 1) 4832 extending substantially parallel to the portion 1031 is provided.

  CTs (instrument current transformers) 491, 492, 493 of each phase are penetrated by vertically extending portions 4811, 4821, 4831 of the load side connection conductors 481, 482, 483. The ground switch (only one phase is shown in FIG. 1) 410 is connected to the load side connection conductors 481, 482, 483, respectively, and the pull-out type circuit breaker 202 is illustrated for inspection of the switch gear 1 and the like. When it is pulled out to the left, the load side connection conductors 481, 482, 483 and the like are grounded for safety.

  Since the circuit breaker chamber 20 is provided above the middle stage in the vertical direction of the casing 100, an operator can work in the cable chamber 40 by opening the cable chamber door 401 and removing the inner cover 402. it can.

  The switchgear 1 according to the first embodiment of the present invention configured as described above opens and closes the vacuum switch built in the drawer type circuit breaker 202 by the control device housed in the control chamber 50. Open / close control of power supplied from the buses 301, 302, 303 to the load via the cables 403, 404, 405 is performed. In addition, when performing maintenance, inspection, or repair of failure of the equipment stored in the casing 100 of the switchgear 1, the control room door 501, the circuit breaker room door 201, the cable room door necessary for the work. Any or all of 401 are opened, and work is performed on the equipment stored in the room.

  When working in the cable chamber 40, first, the pull-out type circuit breaker 202 is pulled out to the left in FIG. 1 by rotating the screw 206, and the power-side terminal 207 and the load-side terminal 208 of the pull-out type circuit breaker 202 are drawn. Is disconnected from the power supply side fixed terminal 2011 and the load side fixed terminal 2012, and the connection between the main buses 301, 302, 303 and the cables 403, 404, 405 is cut off. At the same time, the ground switch 410 is turned on to ground the cables 403, 404, 405, the load side connection conductors 481, 482, 483, and the like. Next, necessary work in the cable chamber 40 is performed in this state.

  According to the switch gear according to the first embodiment of the present invention described above, the main bus 301 fixed to the partition plate 101 as the first wall body and the partition plate 102 as the second wall body are fixed. Since the main bus 302 is disposed so as to be overlapped in the horizontal direction, the drawer type circuit breaker 202 can be connected to the vertical direction of the casing 100 without increasing the vertical dimension of the casing 100 of the switch gear 1. Therefore, necessary work can be performed on the cables and other devices in the cable chamber 40 from the front side of the housing 100 through the floor surface 411 of the cable chamber 40, A switch gear with excellent workability can be obtained.

  If the partition plate 103 is not provided with the inclined portion 1031, the upper space of the cable chamber 40 is largely blocked by the vertical and horizontal walls of the partition plate 103, and the space of the cable chamber 40 is narrow. However, according to the first embodiment of the present invention, the partition plate 103 is provided with the inclined portion 1031 extending downward from the partition plate 102 side to the partition plates 101 and 104 side. The upper space becomes wider, and the cables 403, 404, 405 and the drawer-type circuit breaker 202 can be connected via a connecting conductor having an inclined extending portion 4832 extending substantially parallel to the inclined portion 1031 of the partition plate 103. As a result, the depth of the cable chamber 40, that is, the size of the casing 100 in the front-rear direction can be reduced, and the switch gear 1 can be reduced in size. .

  The switchgear according to the present invention is used as a switchgear having a circuit breaker that controls opening and closing of power supply from a main bus connected to a power system to a load in the heavy electric field and the like.

Claims (5)

A main bus chamber for storing a three-phase main bus connected to a power source, a cable chamber for storing a cable connected to a load provided vertically below the main bus chamber, and the main bus and the cable. A switchgear having a housing with a circuit breaker chamber that houses a circuit breaker that is electrically connected and opens and closes an electric circuit from the power source to the load,
The housing is
A first wall located between the main bus chamber and the circuit breaker chamber and substantially vertical;
A second wall that opposes the first wall through an internal space of the main bus chamber and forms a part of the main bus chamber;
A first portion is provided between the main bus chamber and the cable chamber and forms a part of the main bus chamber, and has an inclined portion extending downwardly from the second wall body side to the first wall body side. 3 walls ,
4th which is located between the circuit breaker room and the main bus room, and between the circuit breaker room and the cable room, and is connected to the first wall body and the third wall body. A wall,
With
Each of the three-phase main buses includes a first main bus bar, a second main bus bar, and a third main bus bar arranged in parallel and extending in the horizontal direction,
The first main bus bar is fixed to the first wall body,
The second main bus line is disposed to face the first main bus line so as to at least partially overlap the first main bus line in the horizontal direction through an internal space of the main bus room, and Fixed to the second wall,
The third main bus bar is positioned below the second main bus bar and fixed to the second wall body,
The circuit breaker chamber is disposed on the front side in the horizontal direction of the housing with respect to the main bus chamber and the cable chamber,
The fourth wall body fixes a power supply side bushing that extends through the fourth wall body and straddles the circuit breaker chamber and the main busbar chamber, and is lower than the power supply side bushing. Fixing the load-side bushing disposed through the fourth wall body and straddling the circuit breaker chamber and the cable chamber,
The power supply side bushing includes a power supply side fixed terminal, one end of which is located below the main busbar and protrudes into the main busbar chamber,
The load-side bushing includes a load-side fixing terminal with one end protruding into the cable chamber,
The circuit breaker includes a power supply side terminal provided detachably with respect to the other end of the power supply side fixed terminal, and a load side terminal provided detachably with respect to the other end of the load side fixed terminal; With
The main bus line is connected to one end of the power supply side fixed terminal via a power supply side connection conductor disposed in the main bus line chamber,
The cable is connected to one end of the load side fixed terminal via a load side connection conductor disposed in the cable chamber,
The load-side connection conductor has one end connected to the load-side fixed terminal and extending substantially parallel to the inclined portion of the third wall body, and extending in the vertical direction and one end being inclined and extending. A switchgear comprising: a vertical extension portion connected to the other end of the portion and the other end connected to the cable. The circuit breaker chamber is disposed in the middle part of the housing,
The said cable room is comprised so that it can open to the said horizontal direction front side of the said housing | casing through the space part located below with respect to the said circuit breaker room. Switchgear. The power supply side connection conductor includes a first power supply side connection conductor having one end connected to the first main bus, a second power supply side connection conductor having one end connected to the second main bus, The end is composed of a third power supply side connection conductor connected to the third main bus,
The first power supply side connection conductor hangs substantially vertically from the one end and the other end is connected to one end of the power supply side fixed terminal,
One end of each of the second power supply side connection conductor and the third power supply side connection conductor is connected to the second main busbar and the third main busbar, and the first main busbar is connected to the first main busbar from each one end. 2. The switchgear according to claim 1, wherein the switchgear is displaced to a position on the lower side in the vertical direction, and is suspended in the substantially vertical direction from the displaced position, and the other ends thereof are respectively connected to the power supply side fixed terminals. .   The instrument current transformer is fixed to the inner wall of the cable chamber on the side of the anti-breaker chamber, and is penetrated by the vertical extending portion in the load side connection conductor. The switchgear described. Wherein said circuit breaker is a drawer type circuit breaker, which is connected fourth to the main bus and the cable of the three-phase when inserted into the wall side of the, when pulled out from the fourth wall side The switchgear according to any one of claims 1 to 4, wherein the connection is released.

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