JP2019054676A - Metal closing type switch gear - Google Patents

Abstract

To provide a metal closing type switch gear capable of reducing the number of man-hours, for example, for bus bar routing and assembly.SOLUTION: A metal closing type switch gear includes, for example, an enclosure, a bus bar and bus duct for the bus bar. The bus bar is provided for each of a plurality of phases and is configured to connect one end on an upstream side of a circuit breaker arranged inside the enclosure. The bus duct for the bus bar is configured so that a plurality of conductors connected with the bus bar for each of the plurality of phases are accommodated in a mutually isolated state using an isolator.SELECTED DRAWING: Figure 1

Description

  Embodiments of the present invention relate to a metal closed switchgear.

  Conventionally, electrical devices such as circuit breakers, busbars, instrument current transformers, and external cables are housed inside the housing, and metal closures that supply power from the busbars to the load via the circuit breaker, instrument current transformer, and external cables A type switchgear is known.

JP 2012-16175 A

  In such a metal closed type switchgear, for example, in the case of a type that supplies power at a low pressure, it is necessary to flow a large current, and accordingly, the number and size of conductors (busbars) per phase of the busbar increase. Tend. As a result, the number of man-hours for wiring and assembly of the bus bars inside the housing has increased. For example, in a three-phase four-wire distribution line or the like, the increase in man-hours becomes significant. Therefore, if a metal closed switchgear that can reduce the man-hours for wiring and assembling of the busbars is obtained, it is meaningful to improve the work efficiency.

  The metal closed switchgear according to the embodiment includes, for example, a housing, a busbar, and a bus duct for busbar. The bus is provided for each of a plurality of phases, and one end is connected to the upstream side of the circuit breaker disposed inside the housing. In the bus duct for buses, a plurality of conductors to which buses for a plurality of phases are connected are housed in a state where they are insulated from each other by an insulator.

FIG. 1 is an exemplary schematic side view of the metal closed switchgear of the first embodiment. FIG. 2 is an exemplary schematic side view of the metal closed switchgear according to the second embodiment. FIG. 3 is an exemplary schematic side view of the metal closed switchgear according to the third embodiment. FIG. 4 is an exemplary schematic side view of the metal closed switchgear according to the fourth embodiment. FIG. 5 is a side view schematically showing a modification of the metal closed switchgear of the fourth embodiment.

  Hereinafter, exemplary embodiments of the present invention are disclosed. The configuration of the embodiment shown below, and the operation and result (effect) brought about by the configuration are examples.

  Moreover, the same component is contained in several embodiment disclosed below. Therefore, below, the same code | symbol is provided to those similar components, and the overlapping description is abbreviate | omitted. In the following drawings, three directions orthogonal to each other are defined for convenience. The X direction is along the front-rear direction of the housing 12 (see, for example, FIG. 1), the Y direction is along the width direction of the housing 12, and the Z direction is along the height direction of the housing 12.

<Embodiment 1>
FIG. 1 is an exemplary schematic side view of a metal closed switchgear (hereinafter simply referred to as “switchgear”) according to the first embodiment. The switch gear 10 shown in FIG. 1 is installed in an electrical room of a building, for example. In the switchgear 10, a circuit breaker, a protective relay, and the like are accommodated in a metal housing 12. The housing 12 can also be referred to as a board or a closed box. In the electric room, a plurality of housings 12 can be provided in a line in the Y direction. For example, the housing 12 has a circuit breaker, an instrument transformer, a power receiving panel that mainly receives power, a load supply cable via a circuit breaker, a current transformer, a zero-phase current transformer, and the like. Feeder board from which the cable is pulled out, a bus connection board for separating the main bus by a circuit breaker for each system, and the like. In addition, in this Embodiment 1 and each embodiment shown hereafter, the switchgear 10 which has the bus-bar structure which makes an assembly operation | work easy in the three-phase four-wire type distribution line as an example is demonstrated.

  The housing | casing 12 is comprised by the flat rectangular parallelepiped box shape, for example. The housing 12 includes a storage portion 12a that forms a substantially sealed space surrounded by a plurality of wall portions (side wall portions, bottom plate portions, ceiling portions). The storage portion 12a is provided with a working opening 12c that is opened in a direction opposite to the X direction and is covered with a door 12b so as to be opened and closed. The door 12b is at least a part of the wall portion constituting the storage portion 12a, and can be formed of a metal plate in the same manner as the wall portion. The door 12b is rotatably supported via a hinge portion having a rotation shaft extending along the Z direction, for example, at an end portion in the Y direction of the door 12b. The door 12b can move between a closed position that closes the opening 12c and an open position that allows the operator to access the inside of the storage portion 12a by opening the opening 12c by rotating around the rotation axis. It is. The door 12b may be provided with a handle (lever, door knob, etc.) so that the door 12b can be easily opened and closed. Moreover, a display device, an indicator lamp, various meters, and the like may be disposed on the outer surface of the door 12b.

  In the storage portion 12a, a circuit breaker 14 which is a main component of the switch gear 10 is fixed at a predetermined position using a rack or the like, for example. For simplification of the drawings, protective relays, power receiving panels, current transformers, zero-phase current transformers, etc. are not shown in the figure, but are appropriately fixed in place using racks, brackets, etc. Has been. The circuit breaker 14 is a vacuum circuit breaker, for example. In the case of FIG. 1, one system is illustrated, but a plurality of systems using a plurality of circuit breakers 14 may be accommodated.

  On the upstream side of the circuit breaker 14 (secondary side of the transformer, the direction opposite to the Z direction in FIG. 1), a plurality of terminals 14a are formed. One end side of the bus bar conductor bar 16 of each phase is electrically and mechanically connected to each terminal 14a. The bus bar side conductor bar 16 is, for example, a rectangular plate part made of copper or the like, and is, for example, an R phase conductor bar, an S phase conductor bar, a T phase conductor bar, or an N phase conductor bar for each phase. In the case of FIG. 1, each bus bar side conductor bar 16 is arranged in a non-contact state with its position shifted in the Y direction (the back side of the drawing).

  A plurality of terminals 14b are also formed on the downstream side (load side, Z direction) of the circuit breaker 14, and a main line side conductor bar 22 made of, for example, a copper material is connected to each terminal 14b. The plurality of trunk-side conductor bars 22 are arranged with their positions shifted in the Y direction for each phase. The trunk-side conductor bar 22 is twisted 90 ° in the middle so that the thickness direction of the trunk-side conductor bar 22 faces the Y direction, and the conductor for each phase in the bus duct 24 disposed outside the housing 12. Easy to connect to. The bus duct 24 is installed toward the load side device. The main line side conductor bar 22 is connected to, for example, a terminal block provided inside or outside (for example, on the ceiling) of the storage portion 12a, and is connected to, for example, a cable via the terminal block to load-side equipment. May be routed towards

  The other end side of each bus bar side conductor bar 16 is electrically and mechanically connected to the bus bus duct 18. The bus bus duct 18 is configured, for example, by housing a plurality of conductors 20 in a rectangular cylindrical metal duct 18a so as to extend in the Y direction. The conductor 20 is, for example, a rectangular plate-shaped part formed of copper or aluminum, and is electrically separated from each other by a flame-retardant insulating support (insulator) or an insulating layer (not shown). It is stored in a metal duct 18a. In the case of FIG. 1, the conductors 20 are an R-phase conductor 20a, an S-phase conductor 20b, a T-phase conductor 20c, and an N-phase conductor 20d, each of which is covered with an insulating layer. Therefore, the R-phase conductor 20a, the S-phase conductor 20b, the T-phase conductor 20c, and the N-phase conductor 20d can be closely arranged in the X direction in the metal duct 18a, and the width (thickness) of the bus bus duct 18 in the X direction. Can be minimized. As a result, it is possible to contribute to the miniaturization of the bus bus duct 18, that is, the reduction of the space for routing the conductors 20. Further, the installation (assembly) work of the conductor 20 inside the storage portion 12a, that is, the installation work of the bus bus duct 18 may be handled by the bus bus duct 18 (for example, one bus bus duct 18). Becomes easier.

  The end opposite to the end to which the bus-side conductor bar 16 of the bus bus duct 18 is connected, that is, the end to which the secondary side of the transformer is connected is formed on the wall surface constituting the storage portion 12a. It can be pulled out of the housing 12 through the opening 12c. In this case, at the installation site of the switchgear 10, each conductor 20 located at the end of the bus bus duct 18 drawn out from the opening 12 c is connected to each corresponding phase on the secondary side of the transformer. In this case, the bus bus duct 18 and the bus duct extending from the secondary side of the transformer can be directly connected, and the number of parts can be reduced. Further, the bus bus duct 18 and the secondary side so that the conductors of each phase of the bus duct 18 extending from the secondary side (the conductor 20 on the bus bus duct 18 side and the conductor of the secondary bus duct) are in contact with each other. The electrical connection and the mechanical connection can be performed at the same time by combining these bus ducts and tightening them together with fastening members (for example, bolts, clips, etc.) collectively from the outside such as the metal duct 18a. As described above, by using the bus duct 18 for the bus, in addition to simplification of the assembly work of the conductor 20 inside the switchgear 10, the connection work of the switchgear 10 with the secondary side of the transformer can be simplified. realizable.

  In another example, a terminal or a terminal block is provided for each phase so as to electrically connect the inside and outside of the wall surface of the storage portion 12a, and each conductor 20 of the bus bus duct 18 is connected inside the storage portion 12a. You may make it leave. In this case, the conductor or cable of each corresponding phase on the secondary side of the transformer is connected to the terminal block for each phase outside the storage portion 12a at the installation site of the switchgear 10. In this case, the number of parts projecting outward from the wall portion of the housing 12 is reduced, and handling is facilitated when the switchgear 10 that has been assembled in a factory or the like is transported to the installation site.

  As described above, according to the switchgear 10 of the first embodiment, by using the bus bus duct 18 in which the conductors 20 (busbar portions) on the upstream side of the circuit breaker 14 are stored in the metal duct 18a, The wiring of the conductors 20 that has been individually performed in each phase inside is omitted, and the assembly work is completed by the collective arrangement of the bus bus ducts 18. As a result, the switch gear 10 can be easily assembled and the assembly efficiency can be improved.

  In the case of FIG. 1, an example is shown in which the bus bus duct 18 is arranged on the bottom surface side of the storage portion 12 a and is drawn out from there. However, in another embodiment, the bus bus duct 18 is connected to the ceiling side of the storage portion 12 a. Or may be pulled out from other side walls. For example, if a plurality of openings for pulling out the bus bus duct 18 are formed in the storage section 12a, the pull-out position of the bus bus duct 18 can be easily set according to the connection environment with the secondary side of the transformer at the installation site. Can be changed. In this case, by appropriately combining bus bus ducts 18 formed with a unit length (for example, several tens of CM) and adjusting the length, the housing portion 12a can be moved from a desired position to the installation position of the circuit breaker 14. Can be pulled out. That is, the connection specification of the switch gear 10 can be easily changed according to the environment of the installation location.

<Embodiment 2>
FIG. 2 is an exemplary schematic side view of the switchgear 30 of the second embodiment. Note that the switch gear 10 of the first embodiment described above is configured by a single casing 12, whereas the switch gear 30 illustrated in the second embodiment is a first casing that mainly accommodates the circuit breaker 14 and the like. 32 (first housing) is different from the second housing 34 (second housing) that mainly accommodates the bus bus duct 18 and the like in that the housing is divided. . In addition, the same code | symbol is attached | subjected to the same or equivalent member which comprises the switchgear 10 of Embodiment 1, and the detailed description is abbreviate | omitted. The first housing 32 and the second housing 34 can be overlapped in the Z direction. The connecting portion between the first housing 32 and the second housing 34 may be provided with unevenness for alignment, for example, and may be fixed to each other by fastening members such as bolts and clips after overlapping. After the first casing 32 and the second casing 34 are overlapped, the configuration is the same as that of the casing 12 of the first embodiment.

  The 1st housing | casing 32 is comprised by the flat rectangular parallelepiped box shape, for example. The 1st housing | casing 32 has the accommodating part 32a which forms the substantially sealed space enclosed by the several wall part (a side wall part, a baseplate part, a ceiling part). The storage portion 32a is provided with a working opening 32c that is opened in a direction opposite to the X direction and is covered with a door 32b so as to be opened and closed. The door 32b is at least a part of a wall portion constituting the storage portion 32a, and can be formed of a metal plate in the same manner as the wall portion. The door 32b is rotatably supported through a hinge portion having a rotation shaft extending along the Z direction, for example, at an end portion in the Y direction of the door 32b. The door 32b rotates around a rotation axis, thereby closing the opening 32c and opening the opening 32c so that the operator can access the circuit breaker 14 and the like inside the storage portion 32a. It can be moved between. The door 32b may be provided with a handle (lever, door knob, etc.) so that the door 32b can be easily opened and closed. Moreover, a display device, an indicator lamp, various meters, and the like may be disposed on the outer surface of the door 32b. In the modified example, the first housing 32 may be a downward-opening box type in which the bottom plate portion is omitted.

  Similarly to the first housing 32, the second housing 34 is configured in a flat rectangular parallelepiped box shape and includes a storage portion 34 a surrounded by a plurality of wall portions. Inside the housing portion 34a is electrically and mechanically connected to the bus bus duct 18 housing the conductors 20 (the R-phase conductor 20a, the S-phase conductor 20b, the T-phase conductor 20c, and the N-phase conductor 20d) and each conductor 20. A plurality of bus-bar-side conductor bars 16 are arranged. The bus-bar-side conductor bar 16 is a rectangular plate-like component made of, for example, copper material, and is, for example, an R-phase conductor bar, an S-phase conductor bar, a T-phase conductor bar, or an N-phase conductor bar for each phase. The second housing 34 can have a substantially sealed structure in which at least a part of the side wall portion, the bottom plate portion, and the ceiling portion can be opened and closed. In this case, the bus bar-side conductor bar 16 protrudes to the outside of the second housing 34 through, for example, an opening formed in a part of the ceiling. When the first housing 32 is of a type having a bottom plate portion, the bus bar side conductor bar 16 is inserted into the storage portion 32a through the opening formed in the bottom plate portion and electrically connected to the terminal 14a of the circuit breaker 14. And mechanically connected. When the first casing 32 is an open bottom type that does not have a bottom plate portion, the bus bar side conductor bar 16 is inserted into the housing portion 32a from the bottom open end and is electrically and mechanically connected to the terminal 14a. The

  Further, when the second casing 34 is an open top type in which the ceiling is omitted, the bus bar side conductor bar 16 protrudes through the top opening and is inserted into the storage portion 32a of the first casing 32. It is electrically and mechanically connected to the terminal 14a.

  On the plurality of terminals 14b provided on the downstream side (load side, Z direction) of the circuit breaker 14, the trunk side conductor bar 22 made of, for example, a copper material is arranged with a position shifted in the Y direction for each phase. ing. The main line side conductor bar 22 is connected to a conductor for each phase in the bus duct 24 arranged outside the housing 12. The bus duct 24 is installed toward the load side device.

  As described above, according to the switchgear 30 of the second embodiment, since the casing is configured by the divided structure of the first casing 32 and the second casing 34, for example, the installation of the circuit breaker 14 and the circuit breaker Assembling work on the first housing 32 side such as a connection work between the main conductor 14 and the main conductor bar 22 and an assembling work on the second housing 34 side such as installation of the bus duct 18 for buses can be performed separately. it can. For example, the assembly of the first housing 32 and the assembly of the second housing 34 can be performed in separate processes or factories, and the assembly work can be made more efficient and divided. Further, by dividing the housing, the first housing 32 and the second housing 34 can be easily transported and handled, which can contribute to the efficiency of work on the installation site.

<Embodiment 3>
FIG. 3 is an exemplary schematic side view of the switch gear 40 of the third embodiment. Note that the bus bus duct 18 for the bus bar of the switch gear 10 of the first embodiment or the switch gear 30 of the second embodiment is configured by one, whereas the switch gear 40 shown in the third embodiment includes a plurality of bus bars. It is different in that it is provided with a bus duct 42 for use (in the case of FIG. 3, two bus ducts 42a for the first bus and 42b for the second bus). In addition, the same code | symbol is attached | subjected to the same or equivalent member which comprises the switchgear 10 of Embodiment 1, and the detailed description is abbreviate | omitted.

  The housing 12 of the switchgear 40 is configured in a flat rectangular parallelepiped box shape, for example, like the housing 12 of the first embodiment. The housing 12 has a storage portion 12a, and the storage portion 12a is provided with an opening portion 12c that is opened in a direction opposite to the X direction and is covered with a door 12b so as to be opened and closed. Yes. The door 12b is movable between a closed position where the opening 12c is closed and an open position where the operator can access the circuit breaker 14 and the like inside the storage 12a by opening the opening 12c. The door 12b may be provided with a handle (lever, door knob, etc.) so that the door 12b can be easily opened and closed. Moreover, a display device, an indicator lamp, various meters, and the like may be disposed on the outer surface of the door 12b.

  The switch gear 40 has different rated currents flowing through the busbars depending on the specifications. For example, there is a specification in which a large current flows. In this case, it is possible to easily cope with this by connecting the bus bus ducts 42 having the same configuration in parallel. In the case of FIG. 3, the first bus bus duct 42 a and the second bus bus duct 42 b have the same configuration, for example, the same configuration as the bus bus duct 18 of the switch gear 10 or the switch gear 30 described above. Therefore, in the case of the switch gear 40, substantially twice as much current can flow as compared to the switch gear 10 or the switch gear 30. Each phase conductor 44 (R-phase conductor 44a, S-phase conductor 44b, T-phase conductor 44c, N-phase conductor 44d) of the first bus bus duct 42a has a bus-side conductor bar 16a (R-phase conductor bar, S-phase) for each phase. Phase conductor bar, T phase conductor bar, and N phase conductor bar). Similarly, each phase conductor 44 (R-phase conductor 44a, S-phase conductor 44b, T-phase conductor 44c, N-phase conductor 44d) of second bus bus duct 42b is connected to bus-side conductor bar 16b (R-phase conductor) for each phase. Bar, S-phase conductor bar, T-phase conductor bar, and N-phase conductor bar). The bus-side conductor bar 16a and the bus-side conductor bar 16b of the same phase are connected in the middle of the wiring, and are electrically and mechanically connected to the terminal 14a of the circuit breaker 14.

  On the plurality of terminals 14b provided on the downstream side (load side, Z direction) of the circuit breaker 14, the trunk side conductor bar 22 made of, for example, a copper material is arranged with a position shifted in the Y direction for each phase. ing. The main line side conductor bar 22 is connected to a conductor for each phase in the bus duct 24 arranged outside the housing 12. The bus duct 24 is installed toward the load side device.

  As described above, according to the switchgear 40 of the third embodiment, the load (for example, heat generation) of the bus bus duct 42 for one bus is generated by sharing the current flowing through the bus section with the plurality of bus bus ducts 42. And the size of each conductor 44 can be kept small. That is, it is possible to cope with a large current while suppressing an increase in the size of the bus bus duct 42. Further, the bus bus duct 42 (bus bus duct 18) can be shared, which can contribute to standardization of design, reduction of parts cost, efficiency of parts management, and the like. In addition, the current flowing in the busbar portion is shared by the plurality of bus bus ducts 42, thereby improving the degree of freedom of layout of the bus bus duct 42 in the storage portion 12a. For example, when arranging a large bus bus duct for handling a large current, it is necessary to secure a coherent arrangement space, and it is necessary to change the layout of other parts, or the case 12 is enlarged. It may be necessary. On the other hand, by using a plurality of bus bus ducts 42 that do not increase in size like the switch gear 40, each bus bus duct 42 can be arranged using a gap space, and the layout of other parts can be changed or the housing can be changed. The increase in size of 12 can be avoided or minimized.

<Embodiment 4>
FIG. 4 is an exemplary schematic side view of the switchgear 50 of the fourth embodiment. The bus bus duct 18 for the switchgear 10 according to the first embodiment and the bus bus duct 42 for the switchgear 40 according to the third embodiment are disposed inside the housing 12, and the bus bus duct 18 according to the second embodiment is disposed in the second housing. The switchgear 50 according to the fourth embodiment is different in that the bus bus duct 54 is disposed outside the housing 52, whereas the switchgear 50 according to the fourth embodiment is arranged inside the body 34. In addition, the same code | symbol is attached | subjected to the same or equivalent member which comprises the switchgear 10 of Embodiment 1, and the detailed description is abbreviate | omitted.

  The casing 52 of the switch gear 50 is configured in a flat rectangular parallelepiped box shape, for example, like the first casing 32 of the second embodiment. The casing 52 has a storage portion 52a, and components other than the bus bus duct 54 are fixed inside a predetermined position by a rack or a bracket (not shown). The storage portion 52a is provided with a work opening 52c that is opened in the direction opposite to the X direction and is covered with a door 52b so as to be opened and closed. The door 52b may be provided with a handle (lever, door knob, etc.) so that the door 52b can be easily opened and closed. The door 52b is movable between a closed position where the opening 52c is closed and an open position where the operator can access the circuit breaker 14 and the like inside the storage 52a by opening the opening 52c. Further, a display device, an indicator lamp, various meters, and the like may be disposed on the outer surface of the door 52b. Such a storage part 52a is positioned on the base plate 52d. The base plate 52d is supported by a plurality of legs 52e. That is, the storage portion 52a is fixed on a bowl-shaped member that forms a space S with the installation floor F. In other words, the housing 52 can be said to be a box shape with a raised bottom.

  A plurality of terminals 14a are formed on the upstream side of the circuit breaker 14 (secondary side of the transformer, opposite to the Z direction in FIG. 4), and one end side of the bus bar side conductor bar 16 (bus bar) of each phase is Electrically and mechanically connected. The bus-bar-side conductor bar 16 is a rectangular plate-like component made of, for example, copper material, and is, for example, an R-phase conductor bar, an S-phase conductor bar, a T-phase conductor bar, or an N-phase conductor bar for each phase. Each bus bar-side conductor bar 16 is disposed in a non-contact state by shifting the position in the Y direction (the back side of the drawing), passes through the bottom plate part that forms the storage part 52a and the through hole formed in the base plate 52d, and passes through the storage part 52a. It protrudes into the space S which is the outside.

  In the case of the switch gear 50, for example, a bracket (not shown) for fixing the bus bus duct 54 is formed on the space S side surface or the leg portion 52e of the base plate 52d. Therefore, the bus bus duct 54 is disposed in the lower portion of the housing portion 52a of the housing 52, that is, outside the housing portion 52a. Therefore, the connection work (assembly work) between the bus-side conductor bar 16 and the conductor 56 (R-phase conductor 56a, S-phase conductor 56b, T-phase conductor 56c, and N-phase conductor 56d) of the bus duct 54 for the busbars opens the door 52b. It is possible to implement without moving to the storage section 52a, that is, without accessing the storage section 52a.

  On the plurality of terminals 14b provided on the downstream side (load side, Z direction) of the circuit breaker 14, the trunk side conductor bar 22 made of, for example, a copper material is arranged with a position shifted in the Y direction for each phase. ing. The main line side conductor bar 22 is connected to a conductor for each phase in the bus duct 24 arranged outside the housing 12. The bus duct 24 is installed toward the load side device.

  Thus, according to the switch gear 50 of the fourth embodiment, the bus-side conductor bar 16 and the conductor 56 of the bus bus duct 54 (the R-phase conductor 56a, the S-phase conductor 56b, the T-phase conductor 56c, and the N-phase conductor 56d) Since the assembling work can be carried out in the space S that is sufficiently open, that is, the assembling workability can be easily improved. Also, maintenance work such as replacement of the bus bus duct 54 need not be accessed in the storage portion 52a, and can be easily performed.

  FIG. 5 is a modification of the installation mode of the switch gear 50. The switch gear 50 shown in FIG. 5 is configured such that the leg portion 52e is omitted and the base plate 52d can be installed so as to contact the installation floor F. Therefore, the same components as those in the switchgear 50 shown in FIG. In the case of the switch gear 50 shown in FIG. 5, the bus bus duct 54 can be preceded and installed at the installation site of the switch gear 50. For example, the bus bus duct 54 can be installed in the installation groove Fa formed in the installation floor F before the casing 52 (the storage portion 52a) including the circuit breaker 14 and the like is moved to the installation position. In this case, the conductor 56 (R-phase conductor 56a, S-phase conductor 56b, T-phase conductor 56c, and N-phase conductor 56d) of the bus duct 54 for buses is the work before moving the casing 52 (housing portion 52a) to the installation location. It can be connected to the secondary side of the transformer in a state where space can be easily secured. Thereafter, the housing 52 (housing portion 52a) is moved to the installation location where the bus bus duct 54 is already assembled, and the bus bar side conductor bar 16 connected to the terminal 14a of the circuit breaker 14 and the conductor 56 of the bus bus duct 54 are connected. To complete the assembly of the switchgear 50. In this case, if the bus bar side conductor bar 16 is connected in advance to the terminal 14a and pulled out from the storage portion 52a, it is easy to connect to the bus bus duct 54 already installed at the installation site.

  In the case of FIG. 5, an example is shown in which the bus-bar-side conductor bar 16 is drawn directly from the floor plate portion of the storage portion 52 a and connected to the bus-bus bus duct 54. The installation position 52 and the installation position of the bus bus duct 54 may be shifted on the installation floor F such as in the X direction or the Y direction. In this case, the bus-side conductor bar 16 is pulled out from, for example, the side wall of the housing portion 52a and connected to the conductor 56 of the bus bus duct 54 installed in the installation groove Fa.

  As described above, according to the modification of the switchgear 50 shown in FIG. 5, the bus duct 54 for busbars can be installed in advance at the installation site of the switchgear 50. Can be installed. That is, the installation work (assembly work) on the bus bus duct 54 side and the installation work of the housing 52 (assembly work) can be performed in different time zones. For example, the conductor 56 can be installed when the installation floor F is constructed. As a result, the degree of freedom of installation work of the switch gear 50 is increased, and efficient assembly work can be performed.

  In each of the above-described embodiments, the example in which the bus bus duct is used for the three-phase four-wire switchgear has been described. However, the present invention is applicable to other distribution line type switchgears and obtains the same effect. be able to.

  As mentioned above, although embodiment of this invention was illustrated, the said embodiment is an example to the last, Comprising: It is not intending limiting the range of invention. The above embodiment can be implemented in various other forms, and various omissions, replacements, combinations, and changes can be made without departing from the spirit of the invention. The above embodiments are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof. The present invention can be realized by configurations other than those disclosed in the above embodiments, and various effects (including derivative effects) obtained by the basic configuration (technical features) can be obtained. is there. In addition, the specifications of each component (structure, type, direction, shape, size, length, width, thickness, height, number, arrangement, position, material, etc.) should be changed as appropriate. Can do.

DESCRIPTION OF SYMBOLS 10, 30, 40, 50 ... Switch gear, 12, 52 ... Housing, 12a, 32a, 34a, 52a ... Storage part, 14 ... Circuit breaker, 14a, 14b ... Terminal, 16, 16a, 16b ... Bus side conductor bar 18, 42, 54 ... bus duct for bus, 20, 44, 56 ... conductor, 20a, 44a, 56a ... R phase conductor, 20b, 44b, 56b ... S phase conductor, 20c, 44c, 56c ... T phase conductor, 20d , 44d, 56d ... N-phase conductor, 22 ... trunk side conductor bar, 24 ... bus duct, 32 ... first housing (first housing), 34 ... second housing (second housing), 42a ... Bus duct for first bus, 42b ... Bus duct for second bus, F ... Installation floor.

Claims (4)

A housing,
One end is connected to the upstream side of the circuit breaker arranged inside the housing, and a bus provided for each of a plurality of phases,
A plurality of conductors to which the buses for each of the plurality of phases are connected are accommodated in a state where they are insulated from each other by an insulator;
Metal closed switchgear with.   2. The metal closed switchgear according to claim 1, wherein the housing includes a first housing in which the circuit breaker is disposed and a second housing in which the bus bus duct is disposed.   3. The metal closed switchgear according to claim 1, wherein the bus bus ducts are connected in parallel with bus bus ducts having the same configuration. 4.   The metal bus-type switchgear according to claim 1 or 3, wherein the bus bus duct is disposed outside the housing.

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