Switchgear

Abstract

To facilitate work within a housing in a small-sized switchgear.SOLUTION: A switchgear (101) comprises: a housing (1); a three-phase vacuum switch (4) which is disposed in front within the housing (1) and provided so as to be drawn to the outside of the housing (1); a three-phase disconnector (7) which is disposed in the back within the housing (1) and connected between the vacuum switch (4) and a power supply end (8); and a three-phase fixture part (6) which can be connected with and disconnected from the vacuum switch (4) and includes conductors (68 and 69) connected with the vacuum switch (4), the three-phase fixture part being a fixture part (6) which is disposed between the vacuum switch (4) and the disconnector (7) and to which the vacuum switch (4) is connected. The fixture part (6) includes three divided portions (61-63) which are disposed so as to be arranged in parallel in a width direction of the housing (1) and divided into phases, and at least one divided portion (62) is provided movably to a region where the vacuum switch (4) is disposed in a state where the vacuum switch (4) is drawn.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to switchgear. [Background technology]

[0002] Conventionally, there has been known a switchgear in which devices arranged in a housing are movable for maintenance, etc. For example, Patent Document 1 discloses that a vacuum circuit breaker housed in a box is transported by a lifter. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-269771 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, as switchgears have become smaller, their housings have also become smaller. This has made it difficult to perform maintenance, inspection, assembly, and other tasks inside the housing. This difficulty is particularly pronounced in switchgears in which switching devices are fixed to a vertically configured fixing section and connected to devices located at the back of the housing via conductors provided inside the fixing section. In such switchgears, even if the switching devices are pulled out of the housing using the lifter disclosed in Patent Document 1, the fixing section prevents workers from entering the housing, making it difficult to perform tasks on the devices at the back of the housing.

[0005] One aspect of the present disclosure aims to facilitate work inside a housing of a miniaturized switchgear. [Means for solving the problem]

[0006] In order to solve the above problem, a switchgear according to one embodiment of the present disclosure includes a housing, a three-phase switching device arranged at the front side inside the housing and capable of being pulled out to the outside of the housing, a three-phase electrical device arranged at the back side inside the housing and connected between the switching device and a power supply end, and a fixing part arranged between the switching device and the electrical device and to which the switching device can be fixed, the three-phase fixing part being connectable to and disconnectable from the switching device and having conductors connected to the electrical device, the fixing part having three divided parts arranged side by side in the width direction of the housing and divided into three parts for each phase, and at least one of the divided parts is arranged so as to be movable to the area where the switching device was arranged when the switching device was pulled out. [Effects of the Invention]

[0007] According to one aspect of the present disclosure, it is possible to facilitate work inside a housing of a miniaturized switchgear. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a plan view showing a configuration of a switchgear in a state in which a vacuum switch is housed in a housing according to an embodiment of the present disclosure. FIG. [Figure 2] FIG. 2 is a side view showing the configuration of the switchgear in a state in which the vacuum switch is housed in a housing. [Figure 3] FIG. 2 is a plan view showing the configuration of the switchgear in a state where the vacuum switch is drawn out to the outside of the housing. [Figure 4] FIG. 2 is a side view showing the configuration of the switchgear in a state where the vacuum switch is drawn out of the housing. [Figure 5] FIG. 10 is a plan view showing the configuration of the switchgear in a state in which the vacuum switch is pulled out of the housing and one divided portion of the fixing portion to which one of the vacuum switch is fixed has moved. [Figure 6] FIG. 10 is a side view showing the configuration of the switchgear in a state in which the vacuum switch is drawn out of the housing and one of the divided portions is moved. [Figure 7]FIG. 10 is a perspective view showing a configuration for holding the moved dividing portion on the housing. [Figure 8] FIG. 10 is a perspective view showing a configuration for positioning the moved dividing portion at a fixed position in the housing. DETAILED DESCRIPTION OF THE INVENTION

[0009] [Embodiment] Hereinafter, the first embodiment of the present disclosure will be described in detail.

[0010] <Switchgear configuration> Fig. 1 is a plan view showing the configuration of a switchgear 101 according to this embodiment in a state where a vacuum switch 4 is housed in a housing 1. Fig. 2 is a side view showing the configuration of the switchgear 101 in a state where a vacuum switch 4 is housed in a housing 1. Fig. 3 is a plan view showing the configuration of the switchgear 101 in a state where a vacuum switch 4 is drawn out of a housing 1. Fig. 4 is a side view showing the configuration of the switchgear 101 in a state where a vacuum switch 4 is drawn out of a housing 1.

[0011] As shown in FIG. 1, the switchgear 101 includes a housing 1, a base 2, a drawer table 3, a vacuum switch 4 (switching device), a carriage 5, a fixed part 6, a disconnecting switch 7 (electrical device), and a power supply end 8.

[0012] The housing 1 is formed in the shape of a rectangular parallelepiped box and has a floor panel 1a, a pair of side walls 1b, a rear wall 1c, a top panel 1d, and a door 1e. The housing 1 is fixed to a base 2 having a predetermined height that is installed on the floor surface F. The door 1e is provided on the front side of the housing 1 through which the vacuum switch 4 is inserted and removed. The rear wall 1c is provided on the rear side of the housing 1, and three-phase power supply terminals 8 to which power is supplied from the outside are fixed. The power supply terminals 8 for each phase are arranged horizontally at intervals on the rear wall 1c. Furthermore, a pair of power supply terminals 8 is provided for each phase, and is arranged vertically at intervals on the rear wall 1c.

[0013] For convenience, Figures 1 and 3 show a state in which the top plate 1d of the housing 1 has been removed to expose the interior. This also applies to Figure 5, which will be described later. For convenience, Figures 2 and 4 show a state in which one side wall 1b of the housing 1 has been removed to expose the interior. This also applies to Figure 6, which will be described later.

[0014] The drawer table 3 is a table on which the dolly 5 is placed, which is drawn out from inside the housing 1. The drawer table 3 is provided so that its top is at the same height as the floor board 1a of the housing 1. As shown in Figures 3 and 4, the drawer table 3 is wide enough to allow the dolly 5 to be completely drawn out to the outside of the housing 1. Although not shown, the drawer table 3 is provided with a pair of guide rails that guide the rolling of rollers 52 of the dolly 5, which will be described later.

[0015] Three vacuum switchgears 4 are provided corresponding to the three phases. The vacuum switchgears 4 open and close the connection between the load side and the disconnector 7 using a vacuum valve provided inside. The vacuum switchgears 4 are housed inside the housing 1 when the switchgear 101 is in normal use. Specifically, the vacuum switchgears 4 are arranged inside the housing 1 on the front side where the door 1e is provided. The vacuum switchgears 4 are fixed to a cart 5 so that they can be pulled out to the outside of the housing 1.

[0016] The vacuum switch 4 has a plurality of components (not shown) including the vacuum valve, a case 41 that houses the components, and two external terminals 42 and 43. The case 41 is formed in a cylindrical shape that extends upward from the carriage 5, and is partially open to the outside to ensure at least connection paths between the external terminals 42 and 43 and the components. The external terminal 42 is located slightly below the upper end of the case 41, facing the back wall 1c. The external terminal 43 is located approximately midway up and down the case, facing the back wall 1c.

[0017] As the switching device, a switch other than the vacuum switch 4 or a circuit breaker may be provided.

[0018] The cart 5 has a main body 51 and a plurality of rollers 52. The main body 51 has a base portion to which the vacuum switch 4 is fixed, and a front portion extending upward from the base portion. The rollers 52 are provided on the bottom surface of the base portion. The rollers 52 roll, allowing the cart 5 to move along a pair of guide rails (not shown) provided on the floor board 1a and the guide rail of the drawer table 3 described above. The rollers 52 are prevented from rolling by a stopper mechanism so that they do not roll when the vacuum switch 4 is fixed to the fixing portion 6.

[0019] The front surface is provided with a handle (not shown) that an operator holds to move the cart 5. The front surface also protects the vacuum switch 4.

[0020] The fixed portion 6 is a structure to which the vacuum switch 4 can be fixed. The fixed portion 6 is arranged between the vacuum switch 4 and the disconnector 7. The fixed portion 6 is provided so as to be connectable to and disconnectable from the vacuum switch 4. The fixed portion 6 will be described in detail later.

[0021] Three disconnectors 7 are provided corresponding to the three phases. The disconnectors 7 are connected between the vacuum switch 4 and the power supply end 8. The disconnectors 7 are arranged on the inner back side (toward the inner wall 1c) of the housing 1. The disconnectors 7 have movable conductors 71 and 72, a support insulator 73, and a pair of bushings 74.

[0022] Movable conductor 71 is disposed on the lower side and is supported by support insulator 73 fixed on floor plate 1a. One end of movable conductor 71 is fixed to bushing 74 disposed on the lower side of rear wall 1c. Movable conductor 72 is disposed above movable conductor 71. One end of movable conductor 72 is fixed to bushing 74 disposed on the upper side of rear wall 1c.

[0023] The lower bushing 74 is disposed between the movable conductor 71 and the lower power supply end 8 and is fixed to the rear wall 1c. The lower bushing 74 connects the movable conductor 71 and the lower power supply end 8 through the inner conductor. The upper bushing 74 is disposed between the movable conductor 72 and the upper power supply end 8 and is fixed to the rear wall 1c. The upper bushing 74 connects the movable conductor 72 and the upper power supply end 8 through the inner conductor.

[0024] The disconnector 7 is opened and closed using an operation mechanism and an operating mechanism. The operating mechanism is located near the door 1e of the side wall 1b, and generates an operating force either manually or electrically operated by a motor or the like. The operating mechanism moves the tips of the movable conductors 71 and 72 between a position where they contact the conductors 69 and 68 of the divisions 61 to 63, respectively, and a position where they are spaced apart from the conductors 69 and 68. The disconnector 7 disconnects and closes the circuit by transmitting the operating force generated by the operating mechanism to the operating mechanism via interlocking parts such as a connecting rod.

[0025] In addition to the disconnector 7, a grounding switch or the like may be provided as the electrical equipment.

[0026] <Configuration of the fixing part> Fig. 5 is a plan view showing the configuration of the switchgear 101 in a state where the vacuum switchgears 4 are drawn out of the housing 1 and the dividing section 62 to which one of the vacuum switchgears 4 is fixed has moved. Fig. 6 is a side view showing the configuration of the switchgear 101 in a state where the vacuum switchgears 4 are drawn out of the housing 1 and the dividing section 62 has moved.

[0027] The fixed portion 6 has three divided portions 61 to 63 which are divided into three phases so as to correspond to the three phases, supports 64 to 66, and a positioning member 67.

[0028] The divided portions 61 to 63 are arranged side by side in the width direction of the housing 1, that is, in the direction perpendicular to the surface of the side wall 1b. Each of the divided portions 61 to 63 has a case 60 and conductors 68, 69.

[0029] The case 60 is formed in a cylindrical shape similar to the case 41 of the vacuum switch 4, and is partially open to the outside in order to ensure at least a space for arranging the conductors 68, 69.

[0030] Conductors 68, 69 are arranged inside and outside case 60 so that one end of each protrudes from case 60 toward vacuum switch 4 and the other end of each protrudes from case 60 toward disconnector 7. Conductor 68 is arranged in a position where one end can contact external terminal 42 of vacuum switch 4 and the other end can contact movable conductor 72 in the closed state of disconnector 7. Conductor 69 is arranged in a position where one end can contact external terminal 43 of vacuum switch 4 and the other end can contact movable conductor 71 in the closed state of disconnector 7.

[0031] The conductors 68, 69 and the external terminals 42, 43 are connected by fastening with bolts and nuts (not shown). When the vacuum switch 4 is pulled out of the housing 1, the connection between the conductors 68, 69 and the external terminals 42, 43 is released. The vacuum switch 4 is fixed to the fixed part 6 by connecting the conductors 68, 69 to the external terminals 42, 43.

[0032] The supports 64 to 66 are provided independently to support the division sections 61 to 63, respectively, and are formed in the shape of a rectangular parallelepiped box. The division sections 61 to 63 are fixed onto the supports 64 to 66, respectively. The supports 64 to 66 are fixed to the floor plate 1a by bolting. However, the support 65 is fixed so that it can be easily attached and detached from the floor plate 1a. Furthermore, the support 65 is provided so that it can slide on the upper surface of the floor plate 1a of the housing 1, i.e., on the bottom surface of the housing 1.

[0033] 5 and 6, this allows the dividing portion 62 arranged at the center of the fixing portion 6 to slide into the area where the vacuum switch 4 was arranged inside the housing 1 when the vacuum switch 4 is pulled out to the outside of the housing 1. It is preferable that the surface of the floor board 1a is formed smoothly so that the support body 65 can slide easily.

[0034] The positioning member 67 is provided to position the moved divided portion 62 when returning it to its fixed position in the fixed portion 6. The positioning member 67 will be described in detail later.

[0035] <Moving the division> Fig. 7 is a perspective view showing a configuration for holding the moved dividing section 62 on the housing 1. Fig. 8 is a perspective view showing a configuration for positioning the moved dividing section 62 at a fixed position on the housing 1.

[0036] When performing maintenance work on the disconnector 7, first, the disconnector 7 is put into a disconnected state, and the external terminals 42, 43 of the vacuum switch 4 are disconnected from the conductors 68, 69 of the fixed portion 6. Then, from the state in which the vacuum switch 4 is housed in the housing 1 as shown in Figures 1 and 2, the door 1e is opened and the vacuum switch 4 is pulled out onto the drawer stand 3 outside the housing 1 as shown in Figures 3 and 4. Furthermore, when the support body 65 is released from its fixation to the floor board 1a, the divided portion 62 becomes movable.

[0037] 5 and 6, the divided portion 62 can be slid toward the front side of the housing 1 (in the direction of arrow A). In this state, the area where the divided portion 62 was fixed to the floor board 1a and the area in front of it are free. Therefore, by entering the area where the divided portion 62 was fixed, a worker can approach the disconnector 7 and perform maintenance work such as cleaning the support insulator 73 and bushing 74 of the disconnector 7.

[0038] Since the dividing section 62 is slidable on the floor board 1a, the dividing section 62 may be moved in the direction B or C, which is the width direction of the housing 1 shown in Fig. 5, as necessary. However, because the above-mentioned guide rails are provided in front of the dividing sections 61 and 63 on the floor board 1a, the dividing section 62 cannot be moved beyond the guide rails.

[0039] As described above, by moving the dividing section 62 of the switchgear 101 to the front side of the housing 1, the space where the moved dividing section 62 was located can be used as an access route for workers. This makes it easier to enter the interior of the housing 1 through the access route. Therefore, work on the disconnector 7 located at the rear side of the interior of the housing 1 can be easily performed.

[0040] In particular, the dividing portion 62 arranged in the center of the fixed portion 6 is movable. This forms an access path in the center of the area where the fixed portion 6 is arranged. Therefore, if a worker enters the back of the housing 1 from this access path, it becomes easier for the worker to reach not only the center of the disconnector 7 but also the left and right sides. Therefore, workability can be improved simply by moving one dividing portion 62.

[0041] Furthermore, the dividing portion 62 is provided so as to be slidable on the floor board 1a. This allows the dividing portion 62 to be moved without specifying a direction. Therefore, the dividing portion 62 can be moved to a convenient position to ensure an access route to the innermost part of the housing 1. This further improves workability.

[0042] In this embodiment, only the dividing section 62 is provided to be movable, but only the dividing section 61 or only the dividing section 63 may be provided to be movable. In addition, in the present disclosure, it is sufficient that at least one of the dividing sections 61 to 63 is provided to be movable.

[0043] Here, if the moved split section 62 is left in this state, there is a risk that it may fall over if it comes into contact with a worker approaching the disconnector 7 side. Therefore, it is preferable that the split section 62 be temporarily held on the floor plate 1a in the moved position. Therefore, in order to hold the moved split section 62 on the floor plate 1a of the housing 1, the switchgear 101 is provided with a pressing member 9 (holding member) and an angle member 10 (holding member), as shown in FIG. 7 .

[0044] The support body 65 has an angle portion 65b at the lower end of a front surface 65a that faces the door 1e in the closed state. The angle portion 65b has a flat plate portion, and is a portion of the support body 65 that is fixed to the floor board 1a by bolting at the flat plate portion when the dividing portion 62 is placed in a fixed position in the fixing portion 6. Furthermore, nothing, including an angle portion like the angle portion 65b, is provided on a rear surface 65c of the support body 65 opposite the front surface 65a.

[0045] The pressing member 9 has a fixed portion 9a and a pressing portion 9b. The fixed portion 9a is formed in a long, thin, flat plate shape and is fixed to the floorboard 1a by bolting. The pressing portion 9b is formed in a long, thin, flat plate shape and is formed at a position higher than the thickness of the flat portion of the angle portion 65b relative to the fixed portion 9a. The fixed portion 9a and the pressing portion 9b are connected by a step portion. The pressing member 9 is formed by press forming or the like using high-strength steel. The pressing member 9 configured in this manner holds the front side of the support body 65 to the floorboard 1a by fixing the fixed portion 9a to the floorboard 1a with the pressing portion 9b covering the flat portion of the angle portion 65b.

[0046] The angle member 10 has a bottom surface 10a, a vertical surface 10b, and a pair of reinforcing portions 10c. The bottom surface 10a is formed in the shape of an elongated flat plate and is fixed to the floor panel 1a by bolting. The vertical surface 10b is formed in the shape of a flat plate perpendicular to the bottom surface 10a. The reinforcing portions 10c connect the bottom surface 10a and the vertical surface 10b at both ends, reinforcing the angle member 10. The angle member 10 configured in this manner holds the rear side of the support body 65 to the floor panel 1a by fixing the bottom surface 10a to the floor panel 1a by bolting, with the vertical surface 10b abutting against the rear surface 65c of the support body 65.

[0047] In this way, by using the pressing member 9 and the angle member 10, the divided portion 62 fixed to the support body 65 is held in the housing 1. This makes it possible to prevent the divided portion 62 from tipping over when it is moved.

[0048] When maintenance work on the disconnector 7 is completed and the split portion 62 is to be returned to its fixed position in the fixed portion 6, the split portion 62 is moved to the fixed position. At this time, in order to properly connect the vacuum switch 4 and the disconnector 7, the split portion 62 must be accurately positioned in the fixed position. For this positioning, the positioning member 67 described above is used.

[0049] The positioning member 67 determines a fixed position of the movably provided dividing section 62 fixed to the housing 1 (floor plate 1a). As shown in FIG. 7, the positioning member 67 has a bottom surface portion 67a, a contact portion 67b, and a pair of reinforcing portions 67c. The bottom surface portion 67a is formed in the shape of an elongated flat plate and is fixed to the floor plate 1a by bolting. The contact portion 67b is formed in the shape of a flat plate and is formed integrally with the bottom surface portion 67a so as to rise vertically from one side end of the bottom surface portion 67a in the longitudinal direction. The contact portion 67b has an abutment surface on the front side, i.e., the side facing the door 1e in the closed state, that abuts against most of the rear surface 65c of the support body 65. The reinforcing portions 67c connect the bottom surface portion 67a and the contact portion 67b at both ends to reinforce the positioning member 67.

[0050] 7, by moving the support body 65 in the direction of the arrow and bringing the rear surface 65c into contact with the contact portion 67b of the positioning member 67, the dividing portion 62 can be positioned and arranged in a fixed position together with the support body 65. This simplifies the positioning work for the dividing portion 62. Therefore, the dividing portion 62 that has been moved can be returned to its fixed position efficiently.

[0051] 〔summary〕 A switchgear according to a first aspect of the present disclosure comprises a housing, a three-phase switching device arranged at the front side inside the housing and capable of being pulled out to the outside of the housing, a three-phase electrical device arranged at the back side inside the housing and connected between the switching device and a power supply end, and a fixing part arranged between the switching device and the electrical device and to which the switching device can be fixed, the three-phase fixing part being connectable to and disconnectable from the switching device and having conductors connected to the electrical device, the fixing part having three divided parts arranged in a line in the width direction of the housing and divided into three parts for each phase, and at least one of the divided parts is arranged so as to be movable to the area where the switching device was arranged when the switching device was pulled out.

[0052] In the above configuration, by moving at least one partition to the front of the housing, the space where the moved partition was located can be used as an access route for workers. This makes it easier to enter the interior of the housing through the access route. Therefore, it is easier to work on electrical equipment located at the back of the housing.

[0053] In the switchgear according to a second aspect of the present disclosure, in addition to the first aspect, the fixed portion may be provided such that the dividing portion disposed at the center is movable.

[0054] According to the above configuration, an access path is formed in the center of the area where the fixing part is arranged. This allows a worker to easily reach not only the center but also the left and right sides of the electrical device by entering the interior of the housing from the access path. Therefore, workability can be improved by simply moving one dividing part.

[0055] In the switchgear according to a third aspect of the present disclosure, in the first or second aspect, the dividing portion may be provided so as to be slidable on a bottom surface of the housing.

[0056] With the above configuration, the dividing section can be moved without specifying a direction. This allows the dividing section to be moved to a convenient position to ensure an access route to the back of the housing. This further improves workability.

[0057] The switchgear according to the fourth aspect of the present disclosure, in the first or second aspect, may further include a positioning member that defines a fixed position of the movably arranged dividing section fixed to the housing and has an abutment surface that abuts the dividing section.

[0058] In the above configuration, when the moved divided section is returned to its fixed position in the housing, the divided section can be positioned and arranged in the fixed position by being positioned so that it abuts against the abutment surface of the positioning member. In this way, the positioning work is simplified, and the work of returning the moved divided section to its fixed position can be performed efficiently.

[0059] The switchgear according to a fifth aspect of the present disclosure is the switchgear of the first or second aspect, and may further include a holding member that holds the moved divided portion on the housing.

[0060] In the above configuration, by holding the divided portion on the housing, it is possible to prevent the divided portion from falling over when moved.

[0061] [Additional Notes] The present disclosure is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. In addition, embodiments obtained by appropriately combining the technical means disclosed in the embodiments are also included in the technical scope of the present disclosure. [Explanation of symbols]

[0062] 1 chassis 4 Vacuum switchgear (switching device) 7 Disconnector (electrical equipment) 6 Fixed part 8 Power supply end 9 Pressing member (holding member) 10 Angle member (holding member) 61~63 Split part 67 Positioning member 68,69 Conductor 101 Switchgear

Claims

1. The housing and a three-phase switching device disposed at a front side inside the housing and provided so as to be able to be drawn out to the outside of the housing; a three-phase electrical device disposed at the back of the housing and connected between the switching device and a power supply terminal; a three-phase fixed portion that is arranged between the switching device and the electrical device and to which the switching device can be fixed, the fixed portion being connectable to and disconnectable from the switching device and having conductors that are connected to the electrical device; the fixed portion has three divided portions arranged side by side in the width direction of the housing and divided into three phases, At least one of the dividing sections is provided so as to be movable into an area where the switching device was disposed when the switching device was pulled out.

2. The switchgear according to claim 1 , wherein the fixed portion is provided so that the divided portion disposed at the center thereof is movable.

3. The switchgear according to claim 1 or 2, wherein the dividing portion is provided so as to be slidable on the bottom surface of the housing.

4. The switchgear according to claim 1 or 2, further comprising a positioning member that defines a fixed position at which the movably provided divided portion is fixed to the housing and has an abutment surface that abuts against the divided portion.

5. The switchgear according to claim 1 or 2, further comprising a holding member that holds the moved divided portion on the housing.

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