Main circuit unit and switchgear

Abstract

To increase installation density of multiple electrical devices to be installed within the housing while utilizing the existing housing as is by connecting separately molded electrical components in series, thereby providing a main circuit unit and a switchgear that can secure a large installation space.SOLUTION: A plurality of main circuit units 1a is electrically connected to each other and provided in a switch gear Pg in which a series of electrical circuits through which a current flows during power reception and distribution are constructed, and includes electrical components P1, P2 constituting main circuit units and equipped with fixed electrodes F1, F2 for switching between energization, disconnection, and grounding, and a connecting structure 9 for separably connecting the electrical components in series with each other, and the connecting structure has a spatial region (air space) 10 in which no fixed electrodes exist, and is divided into a plurality of spatial regions so as to separably connect the electrical components to each other.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] An embodiment of the present invention relates to a main circuit unit and a switchgear. [Background technology]

[0002] For example, a switchgear that houses multiple electrical devices for receiving and distributing electrical power inside a grounded metal housing (also called a panel) is known as a switchgear for receiving and distributing electrical power installed in a building or large facility. As the electrical devices, various types of switches such as an earthing device (ES), a disconnecting switch (DS), and a vacuum circuit breaker (VCB) are assumed, and these electrical devices (i.e., switches) are installed in a multi-tiered state inside the housing.

[0003] The inside of the housing is divided by a partition wall. One side of the partition wall houses a main circuit structure through which current flows during power reception and distribution. The other side of the partition wall houses an operating structure that controls the flow of current by operating the main circuit structure.

[0004] The main circuit structure is configured to have a connection structure that electrically connects the above-mentioned multiple electric devices. Furthermore, each of the multiple electric devices is configured to be divided into a main circuit unit for constructing the main circuit structure and an operation unit for constructing the operation structure.

[0005] The main circuit unit is configured to have electrical components (e.g., electrical components for an earthing device (ES), electrical components for a disconnector (DS), etc.) equipped with fixed electrodes through which current flows during power reception and distribution. The operation unit is configured to be able to operate a movable electrode with respect to the main circuit unit (electrical component).

[0006] Furthermore, in the above-mentioned connection structure, each main circuit unit (electrical component) is made of, for example, a conductor such as metal and has a connection part connected to the above-mentioned fixed electrode. By connecting these connection parts together, the multiple main circuit units (electrical components) are electrically connected to each other. As a result, in the main circuit structure, a series of electric circuits through which current flows during power reception and distribution is constructed by the multiple electrically connected main circuit units (electrical components).

[0007] In such a configuration, by operating the main circuit unit (electrical component) with the operation unit, for example, a fault current is interrupted and a load current is opened and closed, resulting in a stable supply of power from the switchgear. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2007-104752 A [Patent Document 2] International Publication No. 2018 / 131124 Summary of the Invention [Problem to be solved by the invention]

[0009] Incidentally, in the conventional switchgear described above, a plurality of electric devices (e.g., an earthing device (ES), a disconnecting switch (DS), etc.) are installed in parallel with each other in an independent state. In this installation state, the installation density of the plurality of electric devices to be installed inside the housing is low. For this reason, it is necessary to secure a large installation space inside the housing in which to install the plurality of electric devices.

[0010] As a method for meeting this demand, multiple electrical devices are connected in series on the same axis, integrated, and molded together as a single (single) casting. For example, in two electrical devices (earthing device (ES), disconnector (DS)), focusing on the electrical components equipped with the fixed electrodes described above, both electrical components are connected in series on the same axis, and molded together as a single (single) casting.

[0011] At this time, both electric components are connected to each other via a connecting structure, and the connecting structure is configured to have a spatial region (e.g., an air space for operating the movable electrode) in which no electric component (i.e., fixed electrode) exists, whereby the movable electrode can be moved (reciprocated) between the electric components (fixed electrodes) via the air space of the connecting structure.

[0012] According to this method, two pieces of electrical equipment (earthing device (ES) and disconnector (DS)) that were installed in parallel with each other can be combined into one. In other words, the electrical components of these two pieces of electrical equipment and the two operation units that were installed in parallel for operating the movable electrodes for both electrical components can be combined into one.

[0013] This reduces the number of electrical devices arranged in parallel inside the housing, and ensures a large installation space inside the housing. As a result, it is possible to increase the installation density of multiple electrical devices to be installed inside the housing while utilizing the existing housing as is.

[0014] However, it is extremely difficult to integrally mold one (single) cast product with air spaces between electrical components, because a core (mold) needs to be set in advance in the connecting structure that should form the air spaces during casting, and if this is done, there is a risk that the core (mold) cannot be removed when demolding.

[0015] The object of the present invention is to provide a main circuit unit and switchgear that can increase the installation density of multiple electrical devices to be installed within an existing housing while utilizing the existing housing as is, by connecting separately molded electrical components in series, thereby enabling a large installation space to be secured. [Means for solving the problem]

[0016] According to an embodiment, a plurality of electrically interconnected main circuit units are provided in a switchgear in which a series of electrical circuits through which current flows during power reception and distribution are constructed, the main circuit units comprising electrical components having fixed electrodes for switching between energization, disconnection, and grounding, and a connecting structure for detachably connecting the electrical components in series with each other, the connecting structure being configured to have a spatial region in which no fixed electrodes exist, and being divided into a plurality of parts together with the spatial region so as to detachably connect the electrical components to each other. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a partial cross-sectional view showing the internal configuration of a switchgear in one embodiment, in which a main circuit structure is constructed by a main circuit unit in which electrical components are connected in series to each other via a connecting structure (a connecting portion divided into two). [Diagram 2] FIG. 1 is a cross-sectional view of a main circuit unit in which different electrical components are connected in series via a connection structure (a connection portion divided into two) in one embodiment, where (a) is a “grounded” state diagram, (b) is an “off” state diagram, and (c) is an “on” state diagram. [Diagram 3] FIG. 1 is a cross-sectional view of a main circuit unit in which identical electrical components are connected in series via a connection structure (a connection portion divided into two) in one embodiment, where (a) is an “on” state diagram, (b) is an “off” state diagram, and (c) is a “grounded” state diagram. [Figure 4] FIG. 11 is a cross-sectional view of an electrical component having two connection portions and one coupling portion in a first modified example. [Diagram 5] FIG. 11 is a cross-sectional view of an electrical component having two connection portions and one coupling portion in a second modified example. [Figure 6] FIG. 11 is a cross-sectional view of an electrical component having three connection portions and one coupling portion in a third modified example. [Figure 7] FIG. 13 is a cross-sectional view of a main circuit unit in which electric components are connected in series via a connecting structure (a connecting portion divided into three) in a fourth modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] "One embodiment" Fig. 1 is a diagram showing the arrangement of main circuit units 1a, 2a, 3a, 4a and switch gear Pg according to this embodiment. Three axes (X-axis, Y-axis, and Z-axis) are shown in Fig. 1. These X-axis, Y-axis, and Z-axis extend in directions perpendicular to each other, and the up-down direction is defined along the Z-axis direction.

[0019] The switchgear Pg is configured by housing multiple electric devices 1, 2, 3, 4 for receiving and distributing electricity inside a grounded metal housing Pb (also called a panel) (i.e., a three-dimensional space defined by the XYZ axes). The electric devices 1, 2, 3, 4 are assumed to be switches dedicated to receiving and distributing electricity, such as an earthing device (ES), a disconnecting switch (DS), and a vacuum circuit breaker (VCB), and these electric devices 1, 2, 3, 4 are arranged in a multi-tiered state inside the housing (panel) Pb.

[0020] 1, as an example, four types of electric devices 1, 2, 3, and 4 are arranged in a multi-layered state from bottom to top of a housing (board) Pb in the Z-axis direction. The multi-layered electric devices 1, 2, 3, and 4 are arranged in the order of a first electric device 1, a second electric device 2, a third electric device 3, and a fourth electric device 4 from bottom to top.

[0021] The first, third and fourth electric devices 1, 3 and 4 are each a grounding device (ES) and a disconnecting switch (DS) that are coaxially connected in series and molded into one composite device. The second electric device 2 is an existing vacuum circuit breaker (VCB) molded into a single casting. Note that the types and arrangements of the electric devices 1, 2, 3 and 4 are merely examples, and it goes without saying that any electric device (not shown) can be stacked in multiple layers depending on the usage environment and purpose.

[0022] As shown in Fig. 1, the inside of the housing (panel) Pb is divided by a partition wall 5. One side of the partition wall 5 houses a main circuit structure 6 through which current flows during power reception and distribution. The other side of the partition wall 5 houses an operation structure 7 that controls the flow of current by operating the main circuit structure 6.

[0023] The above-mentioned four types of electrical equipment 1, 2, 3, 4 are respectively configured as main circuit units 1a, 2a, 3a, 4a for constructing a main circuit structure 6, and operation units 1b, 2b, 3b, 4b for constructing an operation structure 7.

[0024] The main circuit structure 6 is configured to have a connection structure 8 that electrically interconnects four types of electric devices 1, 2, 3, 4 (i.e., a plurality of main circuit units 1a, 2a, 3a, 4a). As will be described later, the connection structure 8 is provided on electric components P1, P2, P that constitute the main circuit units 1a, 2a, 3a, 4a. These electric components P1, P2, P each have a connection portion 8p (connection structure 8) connected to fixed electrodes F1, F2, which will be described later, and the connection portion 8p is configured of a conductor D such as a metal.

[0025] In this case, the main circuit units 1a, 2a, 3a, 4a (electrical components P1, P2, P) are electrically interconnected by connecting the connection parts 8p together. As a result, in the main circuit structure 6, a series of electric circuits through which current flows during power reception and distribution is constructed by the multiple electrically interconnected main circuit units 1a, 2a, 3a, 4a (electrical components P1, P2, P).

[0026] In this configuration, by operating the main circuit units 1a, 2a, 3a, 4a with the operation units 1b, 2b, 3b, 4b, for example, a fault current is interrupted and a load current is opened and closed, so that electric power is stably supplied from the switch gear Pg. Each of the electric devices 1, 2, 3, 4 will be specifically described below.

[0027] The first electric device 1 is a molded combination of an earthing device (ES) and a disconnector (DS). In Fig. 1, as an example, the first main circuit unit 1a has two electric components P1 and P2 and a connecting structure 9 that connects the two electric components P1 and P2.

[0028] The electric components P1 and P2 are each provided with a fixed electrode F1 and F2 for switching between energization, disconnection, and grounding. One electric component P1 has a fixed electrode F1, which is configured so that a movable electrode M, which will be described later, can be inserted therethrough. The other electric component P2 has a fixed electrode F2, which is configured so that the movable electrode M comes into contact with the fixed electrode F2 and cannot move any further.

[0029] The connecting structure 9 connects the electric components P1 and P2 in a separable manner while arranging them in series on the same axis. For this reason, the connecting structure 9 is configured to have a spatial region 10 (i.e., an air space for operating the movable electrode M) where the fixed electrodes F1 and F2 are not present.

[0030] A spatial region (air space) 10 is provided between a fixed electrode F1 of one electric component P1 and a fixed electrode F2 of the other electric component P2 when viewed in the direction in which the electric components P1, P2 are arranged in series with each other.

[0031] The contour shape of the spatial region (air space) 10 is formed by combining one spatial region forming surface S1 and the other spatial region forming surface S2, which are opposed to each other. The one spatial region forming surface S1 extends from the fixed electrode F1 toward the electric component P2. The other spatial region forming surface S2 extends from the fixed electrode F2 toward the electric component P1.

[0032] The connection structure 9 is divided into a plurality of parts together with the spatial region (air space) 10 so as to detachably connect the electric components P1 and P2 to each other. In FIG. 1, as an example, the connection structure 9 is divided into two parts together with the spatial region (air space) 10.

[0033] The position for dividing the electrical components P1, P2 into two is preferably between the fixed electrodes F1, F2 (i.e., the region where the spatial region (air space) 10 exists) and is not including the fixed electrodes F1, F2. In Fig. 1, as an example, the position for dividing the electrical components P1, P2 into two coincides with a position where the linear distance between the fixed electrodes F1, F2 (specifically, the center G of the connection portion 8p (conductor D) described later) is divided into two equal parts when viewed in the direction in which the electrical components P1, P2 are connected in series with each other.

[0034] In this case, when viewed in the direction in which the electrical components P1 and P2 are connected in series with each other, the distance A from the center G of the connection portion 8p (conductor D) to the position where it is divided into two equal parts (i.e., the dividing surface Sc described later) is set to be the same for each of the electrical components P1 and P2.

[0035] Here, each of the electrical components P1, P2 is molded by covering it with the insulating resin R together with the above-mentioned connection structure 8 (connection portion 8p) and coupling structure 9. At this time, one connection portion 8p (conductor D) is integrated with each of the electrical components P1, P2 covered with the insulating resin R, and the connection portion 8 (conductor D) extends in the vertical direction (Z-axis direction) perpendicular to the direction in which the electrical components P1, P2 are arranged in series with each other.

[0036] At connection portion 8p extending upward from electric component P1, conductor D is connected to fixed electrode F1. At connection portion 8p extending downward from electric component P2, conductor D is connected to fixed electrode F2. In this case, fixed electrode F2 may be connected to power supply line 13 from connection portion 8p (conductor D) via various circuit systems 12.

[0037] Furthermore, in the portion where the connecting structure 9 is divided into two, two connecting parts T1, T2 molded with insulating resin R are formed on both sides of the dividing surface Sc. These two connecting parts T1, T2 are adjacently connected to each other via the dividing surface Sc in a state where both the molded products (i.e., the electrical components P1, P2 covered with insulating resin R) are arranged in series on the same axis.

[0038] At this time, a spatial region (air space) 10 in which the fixed electrodes F1, F2 are not present is formed between the connecting portions T1, T2 when viewed in the direction in which the electric components P1, P2 are connected in series with each other. This results in the molding of a first main circuit unit 1a in which the spatial region (air space) 10 is interposed between the electric components P1, P2. In this cast product, the insulating resin R is divided into two at the same position as the connecting structure 9.

[0039] In this case, the one-side spatial region forming surface S1 and the other-side spatial region forming surface S2 satisfy a plane-symmetrical relationship with each other about the bisecting position.

[0040] 1, as an example of plane symmetry, the one-side spatial region forming surface S1 is configured as a conical surface that forms a widening gradient from the one fixed electrode F1 toward the other electric component P2. In other words, the one-side spatial region forming surface S1 is configured as a conical surface that forms a tapered gradient from the other electric component P2 toward the one fixed electrode F1.

[0041] The other-side spatial region surface S2 is configured as a conical surface that forms a widening gradient from the other fixed electrode F2 toward the one electric component P1. In other words, the other-side spatial region surface S2 is configured as a conical surface that forms a tapered gradient from the one electric component P1 toward the other fixed electrode F2.

[0042] Furthermore, in Figure 1, as an example, if the total length of the fixed electrode F1 (i.e., the fixed electrode F1 through which the movable electrode M can be inserted) provided on one side of the spatial area (air space) 10 (i.e., the electrical component P1) is L1 and the total length of the movable electrode M is L2, they are set to satisfy the relationship L1 ≧ L2.

[0043] Furthermore, in the above-mentioned first main circuit unit 1a, the electric component P1 is provided with an air space 11 molded from the above-mentioned insulating resin R on the opposite side of the one-side spatial region forming surface S1 across the fixed electrode F1. This air space 11 is formed as a conical spatial region by a conical surface S3 that forms a diverging gradient from the fixed electrode F1 toward the partition wall 5.

[0044] A single operation shaft H extends from the first operation unit 1b so as to be capable of being projected and retracted. The operation shaft H extends from the partition wall 5 through the air space 11, and a movable electrode M is attached to its extending end. In this case, by projecting and retracting the operation shaft H, the movable electrode M can be reciprocated along the space between the fixed electrodes F1 and F2.

[0045] The second electric device 2 is connected to the above-mentioned first electric device 1 via a connection structure 8 (connection portion 8p). In this case, the fixed electrode F1 of the second electric device 2 and the fixed electrode F1 of the first electric device 1 are electrically connected to each other via their respective connection portions 8p (conductors D).

[0046] In the second electric device 2, the second main circuit unit 2a is configured to have one (single) electric component P equipped with fixed electrodes F1, F2 for configuring an existing vacuum circuit breaker (VCB). The electric component P has two fixed electrodes F1, F2, and these two fixed electrodes F1, F2 are integrally covered with an insulating resin R. One of the fixed electrodes F1 is configured to allow the movable electrode M to be inserted therethrough, and the other fixed electrode F2 is configured to be in contact with the movable electrode M so as to be unable to move any further.

[0047] A single operation shaft H extends from the second operation unit 2b in a protruding and retracting manner, and the operation shaft H extends from the partition wall 5 through the air space 11, and a movable electrode M is attached to its extending end. In this case, by operating the operation shaft H to protrude and retract, the movable electrode M can be reciprocated along the space between the fixed electrodes F1 and F2.

[0048] The third electric device 3 is formed by integrating an earthing device (ES) and a disconnector (DS) into one. The third main circuit unit 3a, like the first electric device 1 described above, has two electric components P1 and P2 and a connecting structure 9 that connects these two electric components P1 and P2.

[0049] The third electric device 3 is connected to the second electric device 2 and other electric devices (not shown) via a connection structure 8 (connection portion 8p). In this case, the conductor D is connected to the fixed electrode F1 at the connection portion 8p extending upward from the electric component P1. The conductor D is connected to the fixed electrode F2 at the connection portion 8p extending downward from the electric component P2. In FIG. 1, as an example, the fixed electrode F2 of the third electric device 3 and the fixed electrode F2 of the second electric device 2 are electrically connected to each other via their connection portions 8p (conductor D).

[0050] Furthermore, an auxiliary connection part 8p-1 is added to the third electric device 3 toward the rear side of the panel, and a conductor D of the auxiliary connection part 8p-1 is connected to a fixed electrode F2. In Fig. 1, as an example, the auxiliary connection part 8p-1 (conductor D) is connected to the rear side busbar 14, so that the fixed electrode F2 of the third electric device 3 and the rear side busbar 14 are electrically connected to each other via the auxiliary connection part 8p-1 (conductor D).

[0051] As with the first electric device 1 described above, one operation shaft H extends from the third operation unit 3b in a protruding and retracting manner, and a movable electrode M is attached to the extending end of the operation shaft H. By operating the operation shaft H to protrude and retract, the movable electrode M can be reciprocated between the fixed electrodes F1 and F2.

[0052] The fourth electric device 4 is a molded combination of an earthing device (ES) and a disconnector (DS). The fourth main circuit unit 4a has two electric components P1 and P2 and a connecting structure 9 that connects the two electric components P1 and P2. Here, the electric component P1 and the connecting structure 9 on one side are similar to those of the first and third electric devices 1 and 3 described above, and only the other electric component P2 is different.

[0053] In the fourth electric device 4, the other electric component P2 is the same as the one electric component P1 (fixed electrode F1) that is inverted horizontally and vertically when viewed in the direction in which the electric components P1 and P2 are connected in series with each other. A ground electrode 15 is disposed on the electric component P2 so as to cover the air space 11 thereof.

[0054] In this case, the conductor D at the connection portion 8p extending upward from the electric component P1 is connected to the fixed electrode F1. At the connection portion 8p extending downward from the other electric component P2, the conductor D is connected to the fixed electrode F1. In FIG. 1, as an example, the connection portion 8p (conductor D) extending upward from one electric component P1 is electrically connected to the inter-board connection busbar 16.

[0055] As with the first electric device 1 described above, one operation shaft H extends from the fourth operation unit 4b in a protruding and retracting manner, and a movable electrode M is attached to the extending end of the operation shaft H. By operating the operation shaft H to protrude and retract, the movable electrode M can be reciprocated along between the fixed electrodes F1.

[0056] Fig. 2 is a switching state diagram of energization, disconnection, and grounding. In Fig. 2, as an example, a first main circuit unit 1a is configured by connecting electric components P1 and P2 in series with each other, and a ground electrode 15 is disposed at one end of the first main circuit unit 1a. Then, a movable electrode M is moved in one direction from one side to the other side.

[0057] 2(a), when the movable electrode M is first positioned on one side, the movable electrode M contacts both the ground electrode 15 and one of the fixed electrodes F1 at the same time. At this time, the fixed electrode F1 is maintained in a grounded "grounded" state.

[0058] 2(b), when the movable electrode M is inserted into one of the fixed electrodes F1, the movable electrode M is positioned within the range of the fixed electrode F1. At this time, the movable electrode M is maintained in a "off" state (insulated state) in which the current flow is interrupted.

[0059] 2(c), when the movable electrode M is finally positioned on the other side, the movable electrode M comes into contact with the other fixed electrode F2 and is stopped from moving any further. At this time, the movable electrode M comes into contact with both fixed electrodes F1 and F2 at the same time, and is thereby maintained in an "ON" state in which electricity is conducted between the fixed electrodes F1 and F2.

[0060] Fig. 3 is a switching state diagram of energization, disconnection, and grounding. In Fig. 3, as an example, a fourth main circuit unit 4a is configured by connecting electric components P1 and P2 in series with each other, and a ground electrode 15 is disposed at the other end of the fourth main circuit unit 4a. Then, the movable electrode M is moved in one direction from one side to the other side.

[0061] As shown in Fig. 3(a), when the movable electrode M is first positioned on one side, the movable electrode M contacts both fixed electrodes F1, F1 at the same time. At this time, the fixed electrodes F1, F1 are maintained in an "ON" state in which electricity is conducted between them.

[0062] 3(b), when the movable electrode M is inserted into the other fixed electrode F1, the movable electrode M is positioned within the range of the fixed electrode F1. At this time, the movable electrode M is maintained in a "off" state (insulated state) in which the current is cut off.

[0063] 3(c), when the movable electrode M is finally positioned on the other side, the movable electrode M comes into contact with the ground electrode 15 and is stopped from moving any further. At this time, the movable electrode M comes into contact with both the ground electrode 15 and the other fixed electrode F1 at the same time, so that the other fixed electrode F1 is maintained in a grounded "grounded" state.

[0064] As described above, according to this embodiment, a plurality of electrical devices (e.g., an earthing device (ES), a disconnecting switch (DS)) are arranged in series on the same axis and molded into one composite unit. In this case, the electrical components P1 and P2, which are separately molded cast products, are connected in series to each other to form one main circuit unit 1a, 3a, 4a. This reduces the number of electrical devices arranged in parallel inside the switchgear Pg (housing Pb), and a large installation space can be secured inside the housing Pb. As a result, it is possible to increase the installation density of a plurality of electrical devices to be installed inside the housing Pb while utilizing the existing housing Pb as it is.

[0065] According to this embodiment, when viewed in the direction in which the electric components P1, P2 are connected in series with each other, the distance A from the center G of the connection portion 8p (conductor D) to a position that divides the linear distance between the fixed electrodes F1, F2 in half (i.e., a dividing plane Sc to be described later) is set to be the same for each of the electric components P1, P2. This allows the shape of the spatial region (air space) 10 in the connection structure 9 to be symmetrical with respect to the dividing plane Sc.

[0066] In this case, the movable electrode M can be moved in one direction from one side to the other to commonize the total stroke when switching between energization, disconnection, and grounding. As a result, it is possible to set the operation units 1b, 2b, 3b, and 4b to have the same configuration regardless of the types of electric components P1 and P2 that are connected in series with each other.

[0067] Furthermore, regardless of the types of the electric components P1, P2 to be connected in series with each other, the shape of the spatial region (air space) 10 in the connection structure 9 can be generalized. As a result, the insulation performance when functioning as a disconnector (DS) can be maintained constant.

[0068] In addition, regardless of the types of electrical components P1, P2 that are connected in series with each other, the arrangement of the connection part 8p (conductor D) can be standardized to a fixed position. As a result, the arrangement of a series of electrical circuits through which current flows during power reception and distribution can be stabilized using multiple main circuit units 1a, 2a, 3a, 4a (electrical components P1, P2, P).

[0069] According to this embodiment, the total length of the fixed electrode F1 through which the movable electrode M can be inserted is L1, and the total length of the movable electrode M is L2, and they are set to satisfy the relationship L1≧L2. In this case, when the movable electrode M is inserted into the fixed electrode F1, the movable electrode M is completely contained within the range of the fixed electrode F1 without protruding from the fixed electrode F1. This ensures that the left-right symmetry of the spatial region (air space) 10 of the connection structure 9 is constant when switching between energization, disconnection, and grounding. As a result, the insulation performance can be maintained constant when the function as a disconnector (DS) is exercised.

[0070] "First Modification" Fig. 4 is a cross-sectional view of the fixed electrode F1 through which the movable electrode M can be inserted. In the above-described embodiment, the fixed electrode F1 includes one connection portion 8p and one linking portion T1, but instead, as shown in Fig. 4, the fixed electrode F1 according to the first modified example includes two connection portions 8p and one linking portion T1. The two connection portions 8p extend in the vertical direction (Z-axis direction).

[0071] As described above, according to the first modification, it is possible to improve the degree of freedom in constructing a series of electric circuits through which current flows during power reception and distribution. Note that other configurations and effects are similar to those of the above-described embodiment, and therefore the description thereof will be omitted.

[0072] "Second modified example" Fig. 5 is a cross-sectional view of the fixed electrode F2 that is in contact with the movable electrode M and cannot move any further. In the above-described embodiment, the fixed electrode F2 includes one connection portion 8p and one linking portion T2, but instead, as shown in Fig. 5, the fixed electrode F2 according to the second modified example includes two connection portions 8p and one linking portion T2. ​​The two connection portions 8p extend in the vertical direction (Z-axis direction).

[0073] As described above, according to the second modification, it is possible to improve the degree of freedom in constructing a series of electric circuits through which current flows during power reception and distribution. Note that other configurations and effects are similar to those of the above-described embodiment, and therefore the description thereof will be omitted.

[0074] "Third Variation" Fig. 6 is a cross-sectional view of the fixed electrode F2 with which the movable electrode M abuts and cannot move any further. In the above-described embodiment, the fixed electrode F2 has two connection parts 8p, 8p-1 and one linking part T2, but instead, as shown in Fig. 6, the fixed electrode F2 according to the third modified example has three connection parts 8p, 8p, 8p-1 and one linking part T2. Of the three connection parts 8p, 8p, 8p-1, two connection parts 8p, 8p extend in the vertical direction (Z-axis direction), and the remaining one auxiliary connection part 8p-1 extends toward the rear surface of the board.

[0075] As described above, according to the second modification, it is possible to improve the degree of freedom of connection when constructing a series of electric circuits through which current flows during power reception and distribution, and to improve the connectivity to the rear side of the panel. Note that other configurations and effects are the same as those of the above embodiment, and therefore the description thereof will be omitted.

[0076] "Fourth Variation" Fig. 7 is a divided cross-sectional configuration diagram of the connection structure 9 (air space 10). In the above-mentioned embodiment, the connection structure 9 is configured to be divided into two at a position that divides the air space 10 into two equal parts, but instead, as shown in Fig. 7, the connection structure 9 according to the fourth modified example is configured to be divided into three parts together with the air space 10.

[0077] In this case, a new electric component P3 is interposed between electric components P1 and P2 as separately molded cast products, thereby forming various main circuit units (no particular reference numerals are given) according to the above-mentioned embodiments. Only a spatial region serving as a component of the air space 10 is molded in the new electric component P3 using insulating resin R.

[0078] Then, the electric component P3 as a new cast product is interposed between the electric components P1 and P2 as cast products molded separately, and these three electric components P1, P3, and P2 are connected in series. As a result, it is possible to mold various main circuit units with an air space 10 interposed between the electric components P1 and P2, similar to the above-mentioned embodiment. Note that other configurations and effects are similar to those of the above-mentioned embodiment, and therefore description thereof will be omitted.

[0079] "Fifth Variation" In the above embodiment and the first to fourth modified examples, for example, as shown in Fig. 4, the electric component P1 having the fixed electrode F1 through which the movable electrode M can be inserted is described assuming a variation in which the contour shapes of the conical surfaces S1, S3 on both sides are different from each other, but instead, the shapes of the conical surfaces S1, S3 on both sides may be set to have the same contour shape. For example, both sides of the fixed electrode F1 are configured with conical surfaces S1 having the same contour shape.

[0080] In the above-described embodiment and the first to fourth modified examples, for example, as shown in Figures 2 and 3, the contour shape of the air space 10 in the connecting structure 9 has been described assuming variations that are plane-symmetrical with respect to a position that bisects the linear distance between both fixed electrodes F1, F2 (i.e., the center G of the connection portion 8p (conductor D)). However, instead of this, the contour shapes may be set to be asymmetrical with respect to each other with respect to the bisecting position.

[0081] Although one embodiment of the present invention and some modified examples have been described above, these embodiments and modified examples are presented as examples and are not intended to limit the scope of the invention. These embodiments and modified examples can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. These embodiments and modified examples are included in the scope and gist of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0082] 1,2,3,4...electrical equipment, 1a,2a,3a,4a...main circuit unit, 1b,2b,3b,4b...operation unit, 5...partition wall, 6...main circuit structure, 7...operation structure, 8...connection structure, 8p...connection portion, 9...coupling structure, 10,11...spatial area (air space), 12...circuit system, 13...power supply line, 14...back side busbar of panel, 15...earth electrode, 16...inter-panel connection busbar, Pg...switchgear, Pb...housing (panel), F1,F2...fixed electrode, M...movable electrode, P,P1,P2...electrical component, S1,S2...spatial area forming surface, Sc...division surface, D...conductor, T1,T2...coupling portion, G...center.

Claims

1. A plurality of main circuit units are provided in a switchgear in which a series of electric circuits through which current flows during power reception and distribution are constructed, and are electrically connected to each other, an electric component that constitutes the main circuit unit and has a fixed electrode for switching between energization, disconnection, and grounding; a connection structure for separably connecting the electrical components in series with each other, The connecting structure is configured to have a spatial area in which the fixed electrodes are not present, and is a main circuit unit that is divided into multiple parts together with the spatial area so as to detachably connect the electrical components to each other.

2. When viewed in a direction in which the electrical components are connected in series with each other, the spatial region is provided between the fixed electrode of one of the electrical components and the fixed electrode of the other of the electrical components, The main circuit unit according to claim 1, wherein the contour shape of the spatial region is formed by opposing and combining a one-side spatial region constituent surface extending from one of the fixed electrodes toward the other of the electrical components with a second-side spatial region constituent surface extending from the other of the fixed electrodes toward one of the electrical components.

3. 3. The main circuit unit according to claim 2, wherein when viewed in the direction in which the electrical components are arranged in series with each other, the one-side spatial region forming surface and the other-side spatial region forming surface satisfy a plane-symmetrical relationship with each other about a position which divides the distance between the two fixed electrodes in half.

4. a connection structure that electrically connects the main circuit units to each other so as to form a series of the electric circuits through which a current flows during power reception and distribution; As the connection structure, the electrical components constituting the main circuit unit each include one or more connection parts formed of a conductor and connected to the fixed electrode, the connection portion extends in a direction perpendicular to a direction in which the electrical components are arranged in series with each other, 4. The main circuit unit according to claim 3, wherein, when viewed in the direction in which the electrical components are connected in series with each other, the distance from the center of the connection portion to the bisected position is set to be the same for each of the electrical components.

5. The electrical components constituting the main circuit unit are molded together with the connection structure and the coupling structure, covered with insulating resin; The main circuit unit according to claim 4 , wherein the insulating resin is divided into a plurality of pieces at the same positions as the connecting structures.

6. When the electrical components are viewed in a direction in which they are arranged in series with each other, a fixed electrode provided on one or both sides of the spatial region and through which a movable electrode that moves between the electrical components can be inserted via the spatial region of the connecting structure has a total length L1; If the total length of the movable electrode is L2, 3. The main circuit unit according to claim 2, wherein the relationship L1≧L2 is satisfied.

7. 7. The main circuit unit according to claim 6, wherein in the main circuit unit configured by connecting the electrical components in series with each other, switching is performed in the order of energization, disconnection, and grounding while the movable electrode is moved in one direction from one of the fixed electrodes to the other of the fixed electrodes.

8. The main circuit unit according to any one of claims 1 to 7; an operation unit for operating the main circuit unit; the connection structure electrically interconnecting the main circuit units; A switchgear in which a series of the electric circuits through which current flows during power reception and distribution is constructed by connecting a plurality of the main circuit units with the connection structure.

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