SWITCHGEAR

Abstract

Switchgear (1) comprising a first compartment (200) accommodating a drawer-type VMC (5) with a vacuum contactor (55) and a power fuse (12), and a second compartment (300, 400) accommodating a main circuit (30, 40), the switchgear (1) being adapted to perform a connection / disconnection between the vacuum contactor (55) and the main circuit (30, 40) by a pulling operation, the switchgear (1) comprising: a fixing frame (4) separating the first compartment (200) and the second compartment (300, 400) from each other and having two bushings (9a, 9b) arranged in a perpendicular direction with respect to a pulling direction of the vacuum contactor (55) for connecting terminals (51, 52) of the vacuum contactor (55) and terminals (7a, 8a) of the main circuit (30, 40); and Closing means (10a, 10b) for closing the two passages (9a, 9b) at a time of separation, wherein one end of the power fuse (12) is located between the two bushings (9a, 9b) in a position ensuring insulation from the closed closure devices (10a, 10b) in a separated state, and another end of the power fuse (12) is located above the vacuum contactor (55), so that the power fuse (12) is mounted so that its longitudinal direction has predetermined angles with respect to the pulling direction and the vertical direction.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a switchgear. TECHNOLOGICAL BACKGROUND

[0002] In a conventional switchgear, a mounting frame is provided on a bottom plate of a compartment storing a combination unit with a built-in power fuse (vacuum electromagnetic contactor, hereinafter referred to as VMC). A vacuum contactor (vacuum circuit switch, hereinafter referred to as VCS) and a power fuse are provided on the mounting frame, forming a drawer-type VMC. Furthermore, a control compartment partitioned by a metal plate is provided above the VMC compartment.

[0003] The VMC is designed to be movable horizontally by operating a drawer mechanism, allowing it to be connected to or disconnected from a bus terminal and a cable-side terminal of the switchgear. Furthermore, the power fuse plays a role of interrupting current when an overcurrent flows.

[0004] The VMC, which includes the attached power fuse, often occupies a larger area than the VCS. As a result, the VMC compartment is often larger in one or both directions of depth and height than the space where the VCS is intended.

[0005] Therefore, in the case where there is a space limitation in the height direction of the VMC compartment, the power fuse is provided horizontally to the bottom surface of the compartment (see, for example, Patent Document 1). Alternatively, in the case where there is a space limitation in the depth direction, the power fuse is provided in a direction perpendicular to the bottom surface of the compartment (see, for example, Patent Document 2). CITATION LISTPATENT DOCUMENT Patent document 1: JP H05 - 64 325 A Patent document 2: JP S64 - 9 805 B2 (JP S58 - 148 605 A) Patent document 3: DE 14 90 958 A Patent document 4: EP 3 598 471 B1 Patent Document 5: US 3,054,874 A Patent document 6: JP S49 - 4 131 U SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION

[0006] In the power fuse arrangement in Patent Document 1, if a power fuse with a large breaking current value is provided, the VMC becomes long in the depth direction. Therefore, the VMC compartment becomes large in the depth direction, thus displacing the space of a main circuit compartment. As a result, the depth of the main circuit compartment must be increased depending on the configuration of the main circuit compartment to ensure an insulation clearance. This increases the overall switchgear size, resulting in increased costs and an increase in installation space.

[0007] In the power fuse arrangement in Patent Document 2, it is necessary to increase the height of the VMC compartment to ensure an insulation distance from the control compartment above the VMC compartment. As a result, the space of the control compartment is displaced, leading to an increase in the switchgear height.

[0008] The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to provide a structure that prevents the entire switchgear from being enlarged due to the power fuse and enables the power fuse to be optimally arranged even in the case where there is a limitation on the space of the compartment. SOLVING THE PROBLEMS

[0009] A switchgear according to the present disclosure comprises a first compartment accommodating a drawer-type VMC with a vacuum contactor and a power fuse, and a second compartment accommodating a main circuit, the switchgear being configured to perform connection / disconnection between the vacuum contactor and the main circuit by a pulling operation, the switchgear comprising: a fixing frame separating the first compartment and the second compartment from each other and having two bushings arranged in a perpendicular direction with respect to a pulling direction of the vacuum contactor for connecting terminals of the vacuum contactor and terminals of the main circuit;and closure means for closing the two bushings at the time of separation, wherein one end of the power fuse is located between the two bushings in a separated state in a position ensuring insulation from the closed closure means, and another end of the power fuse is located above the vacuum contactor, so that the power fuse is mounted such that its longitudinal direction has predetermined angles with respect to the pulling direction and the vertical direction; EFFECT OF THE INVENTION

[0010] In the switchgear according to the present disclosure, the power fuse is arranged to be inclined at a predetermined angle, whereby an increase in size in the depth direction and the height direction of the first compartment can be suppressed and the size of the switchgear can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS [ Fig. 1] Fig. 1 shows a side view of a switchgear according to embodiment 1. [ Fig. 2] Fig. 2 shows an enlarged view of a mounting frame 4 according to Embodiment 1. [ Fig. 3] Fig. Fig. 3 is a structural view of a drawer-type VMC according to Embodiment 1, wherein Fig. 3A is a perspective view and Fig. 3B shows a side view. [ Fig. 4] Fig. 4 shows an enlarged partial view of the Fig. 3B, where Fig. 4A is an enlarged view of an area Q in Fig. 3B and Fig. 4B is an enlarged view of an area P in Fig. 3B is. [ Fig. 5] Fig. 5 illustrates an actuation of a closure device 10a, wherein Fig. Figure 5A is a view showing a separated position, wherein Fig. Figure 5B is a view showing a middle position and wherein Fig. 5C is a view showing a connected position. [ Fig. 6] Fig. 6 illustrates an actuation of a closure device 10b, wherein Fig. Figure 6A is a view showing a separated position, wherein Fig. 6B is a view showing a middle position, and wherein Fig. 6C is a view showing a connected position. DESCRIPTION OF THE EMBODIMENTS

[0011] Hereinafter, preferred embodiments of a power control device according to the present disclosure will be described with reference to the drawings. Note that the same or corresponding parts are denoted by the same reference numerals, and their detailed description will be omitted. Embodiment 1

[0012] Fig. 1 shows a side view of a switchgear 1 according to an embodiment 1. In Fig. 1, the switchgear 1 of a metal-enclosed type is enclosed in its entirety by a grounded metal enclosure 2 and constitutes a metal-enclosed or compartment-type switchgear in which a control compartment 100, a VMC compartment 200 and a main circuit compartment formed by a bus compartment 300 and a cable compartment 400 are partitioned by grounded metal or an insulating material.

[0013] In the VMC compartment 200, a mounting frame 4 is provided on a base plate 3, and a drawer-type VMC 5 with a VCS 55 and a power fuse is mounted on the mounting frame 4. Fig. 1 shows a state in which the VMC 5 is in a connected position.

[0014] In the bus compartment 300, a bus compartment conductor 30 is connected to the mounting frame 4. In the cable compartment 400, one end of a cable compartment conductor 40 is connected to the mounting frame 4, and the other end thereof is connected to a cable 500 inserted from the outside.

[0015] Furthermore, locking devices 10a, 10b made of metal are provided for the mounting frame 4. A power fuse 12 of the VMC 5 is arranged obliquely such that one end 13 thereof is in a separated state by an insulating distance or further from the locking devices 10a, 10b and is located between a bushing 9a and a bushing 9b. Thus, it becomes possible to reduce the size of the VMC 5 in the depth direction by an amount corresponding to the insulating distance between the power fuse 12 and the locking devices 10a, 10b, and an increase in size in the height direction is also minimized.As a result, it becomes possible to set the VMC compartment 200 in a size approximately equal to the size in which the VCS 55 is provided, whereby an increase in size in the depth direction and the height direction of the VMC compartment 200 can be suppressed, so that a cost reduction and an installation area reduction of the switchgear 1 of a metal-enclosed type are enabled.

[0016] Next, structures enabling such an arrangement of the power fuse 12 as described above will be described in detail.

[0017] Fig. 2 shows an enlarged view of the fixing frame 4. The fixing frame 4 is provided with the grommet 9a that insulates a metal frame 6 forming the outer shape and bus-side terminals 7a, 7b from each other, and with the grommet 9b that insulates the frame 6 and cable-side terminals 8a, 8b from each other. The bus-side terminals 7a, 7b are pulled together with the grommet 9a by a bolt 14a, and the cable-side terminals 8a, 8b are pulled together with the grommet 9b by a bolt 14b. The bus compartment conductor 30 is fixed to the bus-side terminal 7b by a bolt, and the cable compartment conductor 40 is fixed to the cable-side terminal 8b by a bolt.

[0018] In the mounting frame 4, the VMC 5 is movable in the horizontal direction by actuating a drawer mechanism 11, which is Fig. 3A or Fig. 3B. The VMC 5 is arranged such that the VMC 5 moves to a disconnected position and a connected position, respectively, at the time of disconnection or connection, which will be described later, and thus terminals 51, 52 on the VMC side 5 are connected to the bus-side terminal 7a and the cable-side terminal 8a of the mounting frame 4, which is shown in Fig. 2, connected or separated therefrom.

[0019] As in Fig. As shown in Fig. 3B, one end of the power fuse 12 is connected to the VCS 55 of the VMC 5. When the VMC 5 is in the connected position, the other end of the power fuse 12 is connected to the bus-side terminal 7a via the terminal 51, and thus the power fuse 12 has a role of interrupting current when an overcurrent flows. Fig. 4A and Fig. 4B show enlarged views of a surface Q and a surface P in Fig. 3B.

[0020] Fig. 4A shows an enlarged view of one end of the power fuse 12 on the side connected to the cable-side terminal 8a via a conductor 15a. The power fuse 12 is inserted into a fuse holder 16a and positioned by contacting with a bolt 17 and then fixed by tightening with a bolt 18a. The conductor 15a is fixed to the fuse holder 16a by a bolt. To arrange the power fuse 12 obliquely, the conductor 15a, which extends perpendicular to the pulling direction of the drawer mechanism 11, is further bent at a predetermined angle toward one side of the arrow A.

[0021] Fig. 4B shows an enlarged view of the power fuse 12 on the side connected to the VCS 55 of the VMC 5 via a conductor 15b. The power fuse 12 is inserted into a fuse holder 16b and fixed by tightening a bolt 18b. The conductor 15b is fastened to the fuse holder 16b by a bolt. To arrange the power fuse 12 obliquely, the conductor 15b extending from the VCS 55 of the VMC 5 perpendicular to the pulling direction of the drawer mechanism 11 is further bent toward an arrow B side opposite to the arrow A side at the same angle as the arrow A side. The size of the power fuse 12 is, for example, approximately 310 mm to 500 mm, and its insulation distance is approximately 90 mm.

[0022] Next, the closure devices 10a, 10b will be described.

[0023] At the time of separation, the closure device 10a closes the bushing 9a, which isolates the frame 6 and the bus-side terminals 7a, 7b from each other. Thus, the closure device 10a has a role of closing the VMC compartment 200 and the bus compartment 300 from each other, which in Fig. 1 are shown.

[0024] Regarding the locking device 10a, when the VMC 5 moves in the direction of an arrow C by the drawer mechanism 11 from the position (hereinafter referred to as a separated position) of the drawer mechanism 11 in a separated state shown in Fig. 5A, pushes a frame 21 attached to the VMC 5, a bearing 20 attached to a frame 19a (see Fig. 5B). The frame 19a forms a linking mechanism together with a frame 19b connected to the locking device 10a. Therefore, when the bearing 20 is pushed upward, the locking device 10a moves vertically upward (direction of an arrow D in Fig. 5B), and then the closure device 10a reaches Fig. 5C, when the drawer mechanism 11 has moved to the position (hereinafter referred to as the connected position) of the drawer mechanism 11 in a connected state, a position that does not hinder connection in the bushing 9a.

[0025] Meanwhile, at the time of separation, the closure device 10b closes the bushing 9b, which isolates the frame 6 and the cable-side terminals 8a, 8b from each other. Thus, the closure device 10b has a role of mutually closing the VMC compartment 200 and the cable compartment 400, which Fig. 1 are shown.

[0026] Regarding the locking device 10b, when the VMC 5 moves in the direction of an arrow C through the drawer mechanism 11 from the separated position shown in Fig. 6A, the frame 21 attached to the VMC 5 pushes up the bearing 20 attached to a frame 22a (see Fig. 6B). The frame 22a, together with a frame 22b and a frame 22c connected to the locking device 10b, forms a linking mechanism. Therefore, when the bearing 20 is pushed upward, the locking device 10b moves vertically downward (in the direction of an arrow E in Fig. 6B), and then the closure device 10b reaches Fig. 6C, when the drawer mechanism 11 has moved into the connected position, a position which does not hinder a connection in the passage 9b.

[0027] As described above, the locking devices 10a, 10b are arranged such that the locking device 10a is moved vertically upward along the mounting frame 4 and that the locking device 10b is moved vertically downward with respect to the moving direction of the drawer mechanism 11. Thus, the distances between the locking devices 10a, 10b and the power fuse 12, which is fixed by means of the fuse holder 16a, become the shortest in the separated position while maintaining the insulating distance, and in the connected position the distances become the longest.

[0028] As described above, Embodiment 1 has a configuration such that the power fuse 12 is tilted at a predetermined angle to arrange the power fuse 12 in a space whose floor area corresponds to the installation area of ​​the VCS 55 of the VMC 5, while maintaining insulation between the VMC compartment 200 and the main circuit compartment. The fuse holders 16a, 16b that hold the power fuse 12, the conductors 15a, 15b that hold it, and the shutters 10a, 10b are arranged and configured to achieve the above-mentioned configuration. Thus, an increase in size in the depth direction and the height direction of the VMC compartment 200 can be suppressed, and the size of the switchgear can be reduced.

[0029] Although the disclosure is described above in terms of an exemplary embodiment, it should be understood that various features, aspects, and functionality described in the embodiment are not limited in their applicability to the particular embodiment in which they are described, but instead may be applied alone or in various combinations to the embodiment of the disclosure.

[0030] It is therefore understood that numerous modifications not described by way of example may be devised without departing from the scope of the present disclosure. For example, at least one of the constituent components could be modified, added, or eliminated. DESCRIPTION OF REFERENCE SYMBOLS 1 switchgear 2 housings 3 Base plate 4 mounting frames 5 Combination unit with built-in power fuse (VMC) 6 frames 7a, 7b bus-side connection 8a, 8b cable-side connection 9a, 9b Implementation 10a, 10b locking device 11 Drawer mechanism 12 Performance assurance 13 End 30 bus managers 40 cable ladders 55 Vacuum contactor (VCS) 100 control compartment 200 VMC compartment 300 bus compartment 400 cable compartment

Claims

[1] Switchgear (1) comprising a first compartment (200) accommodating a drawer-type VMC (5) with a vacuum contactor (55) and a power fuse (12), and a second compartment (300, 400) accommodating a main circuit (30, 40), the switchgear (1) being arranged to perform a connection / disconnection between the vacuum contactor (55) and the main circuit (30, 40) by a pulling operation, the switchgear (1) comprising: a fixing frame (4) separating the first compartment (200) and the second compartment (300, 400) from each other and having two bushings (9a, 9b) arranged in a perpendicular direction with respect to a pulling direction of the vacuum contactor (55) for connecting terminals (51, 52) of the vacuum contactor (55) and terminals (7a, 8a) of the main circuit (30, 40); and Closing means (10a, 10b) for closing the two passages (9a, 9b) at a time of separation, wherein one end of the power fuse (12) is located between the two bushings (9a, 9b) in a position ensuring insulation from the closed closure devices (10a, 10b) in a separated state, and another end of the power fuse (12) is located above the vacuum contactor (55), so that the power fuse (12) is mounted so that its longitudinal direction has predetermined angles with respect to the pulling direction and the vertical direction. [2] Switchgear (1) according to claim 1, wherein the attachment of the power fuse (12) is made by bending, at the predetermined angles, conductors (15a, 15b) which are connected to holding means (16a, 16b) which hold both ends of the power fuse (12) and which extend in the vertical direction. [3] Switchgear (1) according to claim 1 or 2, wherein the two locking devices (10a, 10b) move in mutually opposite directions at a time of shifting from the disconnected state to a connected state, and the two locking devices (10a, 10b) are located furthest away from the power fuse (12) in the connected state.

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