Main circuit unit and switchgear
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- KK TOSHIBA
- Filing Date
- 2023-01-04
- Publication Date
- 2026-08-03
Smart Images
Figure 0007899104000001 
Figure 0007899104000002 
Figure 0007899104000003
Abstract
Description
Technical Field
[0001] Embodiments of this invention relate to a main circuit unit and a switchgear.
Background Art
[0002] For example, as a switching device for power reception and distribution provided in a building or a large facility, a switchgear that houses various electrical devices used for power reception and distribution inside a grounded metal housing (also referred to as a panel) is known. Examples of the electrical devices include various switches such as a grounding device (ES), a circuit breaker (DS), a vacuum circuit breaker (VCB), a circuit breaker with a grounding device (DS / ES), as well as a lightning arrester (SAR), a current transformer (CT), etc. These electrical devices are arranged in a multi-stage stacked state along the inside of the housing (panel).
[0003] The inside of the housing (panel) is partitioned by partition walls. On one side of the partition wall, a main circuit structure through which current flows during power reception and distribution is housed. On the other side of the partition wall, an operation structure that controls the flow of current by operating the main circuit structure is housed. Each of the above-mentioned various electrical 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.
[0004] The main circuit unit is electrically connected to each other, for example, by a connection part composed of a conductor. As a result, a series of electrical circuits through which current flows during power reception and distribution are configured in the main circuit structure. The operation unit is configured to be able to operate the main circuit unit.
[0005] In such a configuration, by operating the main circuit unit with the operation unit, for example, interruption of an accident current and opening / closing of a load current are performed, and as a result, power is stably supplied from the switchgear.
Prior Art Documents
Patent Documents
[0006] [Patent Document 1] Japanese Patent Publication No. 2010-041859 [Overview of the project] [Problems that the invention aims to solve]
[0007] Incidentally, in conventional switchgear, the contour shapes of the various main circuit units used to construct the main circuit structure described above are arbitrarily set for each main circuit unit. Therefore, the external dimensions (e.g., length, width) that define the contour shape also differ for each main circuit unit. In this case, when the electrical equipment described above is stacked in multiple layers along the inside of the enclosure (panel), the pitch between adjacent main circuit units (hereinafter referred to as the inter-unit pitch) will differ from one another.
[0008] Consequently, for connecting the main circuit units to each other, separate connectors of different lengths must be prepared for each different unit pitch. This increases the number of components required to construct the main circuit structure, and as a result, the manufacturing cost of the switchgear increases.
[0009] Here, if the pitch between units is made equal, it becomes unnecessary to prepare separate connectors of different lengths. However, since the arrangement and number of unit pitches do not change, the number of connectors of equal length that need to be prepared will be the same as in the case where the lengths are different.
[0010] This would necessitate individually preparing connection points of equal length for each unit pitch of equal length, which, as with the case of different lengths described above, increases the number of components required to construct the main circuit structure, and consequently, increases the manufacturing cost of the switchgear.
[0011] Furthermore, the switchgear is equipped with, for example, busbars for inter-panel connections. However, the busbar connection points are limited to the upper part of the panel, where they are less affected by the inter-unit pitch mentioned above. Therefore, there were certain limitations on the panel configuration.
[0012] The object of the present invention is to provide a main circuit unit and switchgear that reduce the number of parts, thereby lowering manufacturing costs, and improve the degree of freedom in busbar connection positions, thereby facilitating panel configuration, by integrating the connection parts for connecting main circuit units to each other within the main circuit unit and standardizing (unifying) the arrangement configuration and external dimensions of the connection parts within the main circuit unit. [Means for solving the problem]
[0013] According to the embodiment, the main circuit unit is provided in a switchgear housing electrical equipment used for power distribution and is used to construct a main circuit structure through which current flows. The main circuit unit comprises a unit body equipped with electrical components constituting the electrical equipment, one or more connection parts that can be integrated with the unit body and have predetermined fixed external dimensions, and an insulating resin layer molded to form the overall external contour including both the unit body and the connection parts. By interconnecting the connection parts, the main circuit units are combined to form a main circuit structure, and the main circuit units are arranged at equal intervals along a predetermined direction. [Brief explanation of the drawing]
[0014] [Figure 1] A partial cross-sectional view showing the overall configuration of a switchgear in the first embodiment, in which the main circuit structure is constructed by a main circuit unit in which the necessary connection parts are selected and integrated. [Figure 2] A diagram showing the internal spatial configuration of the mold used to form the main circuit unit with integrated connection points. [Figure 3] A cross-sectional view showing an example of a main circuit unit (DS) molded using the mold shown in Figure 2. [Figure 4] A cross-sectional view showing an example of a main circuit unit (VCB) molded using the mold shown in Figure 2. [Figure 5] A top view showing the parallel connections between busbars in the upper part of the control panel. [Figure 6]Top view showing the off-column connection of busbars between switchboards at the upper part of the switchboard. [Figure 7] Rear view showing the in-column connection of busbars between switchboards at the back of the switchboard. [Figure 8] Rear view showing the off-column connection of busbars between switchboards at the back of the switchboard. [Figure 9] In the second embodiment, an external view of the main circuit unit that enables selection and integration of necessary connection parts from a plurality of separately formed connection parts. [Figure 10] Cross-sectional view of the two-part type main circuit unit according to the first modification. [Figure 11] Cross-sectional view of the three-part type main circuit unit according to the second modification. [Figure 12] In the third modification, a side view partially showing the state where the main circuit structure is constructed by the main circuit unit in which all connection parts are integrated.
Mode for Carrying Out the Invention
[0015] "First Embodiment" FIG. 1 is an internal structure diagram of the switchgear 1 according to the first embodiment. In FIG. 1, three axes (X-axis, Y-axis, Z-axis) are shown. These X-axis, Y-axis, and Z-axis extend in directions perpendicular to each other, and the vertical direction is defined along the Z-axis direction.
[0016] In the switchgear 1, various electrical devices used for power reception and distribution are housed inside a grounded metal housing 2 (also referred to as a switchboard), that is, inside the three-dimensional space defined by the XYZ axes. As electrical devices, for example, switches dedicated to power reception and distribution such as a grounding device (ES), a circuit breaker (DS), a vacuum circuit breaker (VCB), a circuit breaker with a grounding device (DS / ES), and in addition to switches, a lightning arrester (SAR), a current transformer (CT), etc. are assumed, and these electrical devices are arranged in a multi-stage stacked state along the inside of the housing (switchboard).
[0017] In FIG. 1, as an example, five types of electrical equipment 3, 4, 5, 6, and 7 are arranged in a multi - stage stacked state in the Z - axis direction from the bottom to the top of the housing 2 (panel). The multi - stage stacked electrical equipment 3, 4, 5, 6, and 7 are, in order from bottom to top, a grounding device 3 (ES) in the first stage, a circuit breaker 4 (DS) in the second stage, a vacuum circuit breaker 5 (VCB) in the third stage, a circuit breaker 6 (DS) in the fourth stage, and a circuit breaker with a grounding device 7 (DS / ES) in the fifth stage.
[0018] Note that such an arrangement of the electrical equipment 3, 4, 5, 6, and 7 is merely an example, and it is needless to say that any electrical equipment can be selected and stacked in multiple stages according to the usage environment and application. For example, instead of the grounding device 3 (ES), a lightning arrester (SAR) or a current transformer (CT) not shown in the figure may be arranged.
[0019] As shown in FIG. 1, the inside of the housing 2 (panel) is partitioned by a partition wall 8. On one side of the partition wall 8, a main circuit structure 9 through which current flows during power reception and distribution is housed. On the other side of the partition wall 8, an operation structure 10 for controlling the flow of current by operating the main circuit structure 9 is housed.
[0020] The above - mentioned five types of electrical equipment 3, 4, 5, 6, and 7 are respectively configured by being allocated to main - circuit units 3n, 4n, 5n, 6n, 7n for constructing the main circuit structure 9 and operation units 3p, 4p, 5p, 6p, 7p for constructing the operation structure 10. In this configuration, by operating the main - circuit units 3n - 7n with the operation units 3p - 7p, for example, interruption of fault current and opening / closing of load current are performed, and as a result, power is stably supplied from the switchgear 1.
[0021] The main circuit units 3n to 7n each comprise a unit body Pm, connection parts 11, 12, 13, 14, and 15 that can be integrated with the unit body Pm, and an insulating resin layer 16. The insulating resin layer 16 is molded to form the overall outer contour, including both the unit body Pm with the connection parts 11 to 15 integrated into it, and the connection parts 11 to 15. The insulating resin layer 16 can be molded from an insulating resin material such as epoxy resin or polyester resin.
[0022] First, the main body of the unit Pm extends along a straight virtual axis L and is configured with an outer contour that is symmetrical with respect to the virtual axis L by the insulating resin layer 16. The main body of the unit Pm is equipped with electrical components for constituting the electrical equipment 3 to 7 described above. The electrical components are entirely covered by the insulating resin layer 16, thereby maintaining an insulated state that is not affected by electrical influences from the outside.
[0023] The main unit Pm of the first-stage grounding device 3(ES) comprises, as electrical components, two fixed electrodes 17 and 18 arranged at intervals along a virtual axis L, a vacuum valve 19 positioned between the fixed electrodes 17 and 18, and a movable electrode 20 that can move toward and away from the fixed electrode 18 protruding into the vacuum valve 19. Near the partition wall 8, an air space 21 is formed by an insulating resin layer 16.
[0024] The unit body Pm of the second and fourth stage disconnectors 4,6(DS) comprises, as electrical components, two fixed electrodes 17,18 arranged at intervals along a virtual axis L, and a movable electrode 20 that can move between the fixed electrodes 17,18. Air spaces 21,22 are formed by insulating resin layers 16 near the partition wall 8 and between the fixed electrodes 17,18.
[0025] The main unit Pm of the third stage vacuum circuit breaker 5 (VCB) comprises, as electrical components, two fixed electrodes 17 and 18 arranged at intervals along a virtual axis L, a vacuum valve 19 positioned between the fixed electrodes 17 and 18, and a movable electrode 20 that can move toward and away from the fixed electrode 18 protruding into the vacuum valve 19. Near the partition wall 8, an air space 21 is formed by an insulating resin layer 16.
[0026] The unit body Pm of the fifth stage grounding disconnector 7 (DS / ES) comprises, as electrical components, two fixed electrodes 17 and 18 arranged at intervals along a virtual axis L, and a movable electrode 20 that can move between the fixed electrodes 17 and 18. Air spaces 21 and 22 are formed by insulating resin layers 16 near the partition wall 8, between the fixed electrodes 17 and 18, and between the fixed electrode 18 and the grounding electrode 23, which will be described later.
[0027] Next, the connection parts 11 to 15 are configured to be integrated with the unit body Pm. As an example in Figure 1, the connection parts 11 to 15 are molded together with the unit body Pm, thereby integrating them with the unit body Pm. For example, a conductor E with a circular cross-section extends from the connection parts 11 to 15. Therefore, when the connection parts 11 to 15 are integrated with the unit body Pm, the base end of the conductor E is electrically connected to the fixed electrodes 17 and 18 described above, and its tip is exposed to the connection surface M, which will be described later.
[0028] Figure 1 shows an example of the arrangement of connection parts 11 to 15. In this case, assuming a single virtual plane (YZ plane) that overlaps with and extends parallel to the virtual axis L, the unit body Pm is configured by arranging one or more connection parts 11 to 15 along the virtual plane extending in the YZ axis direction, and on one or both sides of the virtual axis L as the center.
[0029] Focusing on the fifth stage grounding disconnector 7 (DS / ES), the unit body Pm has two connection parts (first connection part 11 and second connection part 12) integrated on the upper side in the Z-axis direction, centered on the virtual axis L, and one connection part (third connection part 13) integrated on the lower side in the Z-axis direction. Furthermore, the fifth stage unit body Pm has one auxiliary connection part 15 integrated at the end on the panel rear side 2p along the virtual axis L, and a grounding electrode 23 is attached to this auxiliary connection part 15.
[0030] In the fifth-stage arrangement, the first connection part 11 is positioned closer to the partition wall 8, and the second connection part 12 is positioned closer to the back of the panel 2p. The pitch (distance) between the first connection part 11 and the second connection part 12 is set to a predetermined constant dimension (for example, dimension value = A) when viewed along the virtual axis L. Furthermore, the first connection part 11 and the third connection part 13 are aligned vertically in the Z-axis direction.
[0031] These three connection parts (first connection part 11, second connection part 12, and third connection part 13) each have a connection surface M for connecting the main circuit unit 7n to the other party. These connection surfaces M are flat and perpendicular to the virtual plane described above, so as to face the other party.
[0032] The shape of the connection surface M can be any shape, such as a circle or a rectangle. Furthermore, the busbars 25 and 26 (described later) are connected to the first and second connection sections 11 and 12 (connection surface M), and the fourth stage disconnector 6 (DS), described later, is connected to the third connection section 13 (connection surface M).
[0033] These three connection parts (first connection part 11, second connection part 12, and third connection part 13) each have predetermined external dimensions. That is, when viewed in a direction perpendicular to the virtual axis L, the distance dimension from the connection surface M to the virtual axis L is set to satisfy the relationship A / 2 with respect to the pitch (distance, dimension value) A between the first connection part 11 and the second connection part 12. In Figure 1, as an example, the pitch (distance, dimension value) A is defined as the distance between the centers of both connection parts 11 and 12 (conductors E).
[0034] Next, focusing on the fourth stage disconnector 6 (DS), the unit body Pm does not have the second connection part 12 and the third connection part 13 of the fifth stage molded into it. That is, the unit body Pm has one connection part (first connection part 11) integrated on the upper side in the Z-axis direction, and one connection part (fourth connection part 14) integrated on the lower side in the Z-axis direction, centered on the virtual axis L. Furthermore, the fourth stage unit body Pm has one auxiliary connection part 15 integrated at the end on the panel rear side 2p along the virtual axis L, and the busbar 27, which will be described later, is connected to this auxiliary connection part 15.
[0035] In the fourth stage configuration, the first connection part 11 is positioned closer to the partition wall 8, and the fourth connection part 14 is positioned closer to the back of the panel 2p. The first connection part 11 is positioned vertically aligned with the third connection part 13 of the fifth stage described above in the Z-axis direction. The fourth connection part 14 is positioned vertically aligned with the second connection part 12 of the fifth stage described above in the Z-axis direction.
[0036] These two connection parts (first connection part 11 and fourth connection part 14) each have a connection surface M for connecting the main circuit unit 6n to the other party. These connection surfaces M are flat and perpendicular to the virtual plane described above, so as to face the other party.
[0037] The shape of the connection surface M can be any shape, such as a circle or a rectangle. Furthermore, the third connection part 13 (connection surface M) of the fifth stage described above is connected to the first connection part 11 (connection surface M), and the third vacuum circuit breaker 5 (VCB), described later, is connected to the fourth connection part 14 (connection surface M).
[0038] These two connecting parts (first connecting part 11 and fourth connecting part 14) each have predetermined external dimensions. That is, when viewed in a direction perpendicular to the virtual axis L, the distance dimension from the connecting surface M to the virtual axis L is set to satisfy the relationship A / 2 with respect to the pitch (distance, dimension value) A between the fifth stage first connecting part 11 and the second connecting part 12 described above.
[0039] Next, focusing on the third stage vacuum circuit breaker 5 (VCB), the first connection part 11 and the fourth connection part 14 of the fourth stage described above are not molded into the unit body Pm. That is, in this unit body Pm, one connection part (second connection part 12) is integrated on the upper side in the Z-axis direction, and one connection part (third connection part 13) is integrated on the lower side in the Z-axis direction, with the virtual axis L as the center. Furthermore, the auxiliary connection part 15 described above is not molded into the end of the unit body Pm on the panel rear side 2p along the virtual axis L.
[0040] In the third-stage arrangement, the second connection part 12 is positioned closer to the rear of the panel 2p, and the third connection part 13 is positioned closer to the partition wall 8. The second connection part 12 is positioned vertically aligned with the fourth connection part 14 of the fourth stage described above in the Z-axis direction. The third connection part 13 is positioned vertically aligned with the first connection part 11 of the fourth stage described above in the Z-axis direction.
[0041] These two connection parts (second connection part 12 and third connection part 13) each have a connection surface M for connecting the main circuit unit 5n to the other party. These connection surfaces M are flat and perpendicular to the virtual plane described above, so as to face the other party.
[0042] The shape of the connection surface M can be any shape, such as a circle or a rectangle. Furthermore, the fourth connection part 14 (connection surface M) of the fourth stage described above is connected to the second connection surface 12, and the second disconnector 4 (DS), described later, is connected to the third connection part 13 (connection surface M).
[0043] These two connecting parts (second connecting part 12 and third connecting part 13) each have predetermined external dimensions. That is, when viewed in a direction perpendicular to the virtual axis L, the distance dimension from the connecting surface M to the virtual axis L is set to satisfy the relationship A / 2 with respect to the pitch (distance, dimension value) A between the fifth stage first connecting part 11 and the second connecting part 12 described above.
[0044] Next, focusing on the second stage disconnector 4 (DS), the unit body Pm does not have the second connection part 12 and the third connection part 13 of the third stage molded into it. That is, the unit body Pm has one connection part (first connection part 11) integrated on the upper side in the Z-axis direction, and one connection part (fourth connection part 14) integrated on the lower side in the Z-axis direction, centered on the virtual axis L. Furthermore, the second stage unit body Pm has one auxiliary connection part 15 integrated at the end on the panel rear side 2p along the virtual axis L, and a power supply line 24 for taking in power from an external power source is connected to this auxiliary connection part 15.
[0045] In the second stage configuration, the first connection part 11 is positioned closer to the partition wall 8, and the fourth connection part 14 is positioned closer to the back of the panel 2p. The first connection part 11 is positioned vertically aligned with the third connection part 13 of the third stage described above in the Z-axis direction. The fourth connection part 14 is positioned vertically aligned with the second connection part 12 of the third stage described above in the Z-axis direction.
[0046] These two connection parts (first connection part 11 and fourth connection part 14) each have a connection surface M for connecting the main circuit unit 4n to the other party. These connection surfaces M are flat and perpendicular to the virtual plane described above, so as to face the other party.
[0047] The shape of the connection surface M can be any shape, such as a circle or a rectangle. Furthermore, the third connection part 13 (connection surface M) of the third stage described above is connected to the first connection part 11 (connection surface M), and the first stage grounding device 3 (ES), described later, is connected to the fourth connection part 14 (connection surface M).
[0048] These two connecting parts (first connecting part 11 and fourth connecting part 14) each have predetermined external dimensions. That is, when viewed in a direction perpendicular to the virtual axis L, the distance dimension from the connecting surface M to the virtual axis L is set to satisfy the relationship A / 2 with respect to the pitch (distance, dimension value) A between the fifth stage first connecting part 11 and the second connecting part 12 described above.
[0049] Finally, focusing on the first-stage grounding device 3(ES), the unit body Pm does not have the first connection part 11 and the fourth connection part 14 of the second stage, nor the third connection part 13 of the third stage, molded into it. That is, the unit body Pm has one connection part (second connection part 12) integrated into it on the upper side in the Z-axis direction, centered on the virtual axis L. Note that the first-stage unit body Pm does not have the auxiliary connection part 15 described above molded into the end on the panel rear side 2p along the virtual axis L.
[0050] In the first stage configuration, the second connection part 12 is positioned closer to the rear part 2p of the panel. The second connection part 12 is aligned vertically with the fourth connection part 14 of the second stage described above in the Z-axis direction.
[0051] This single second connection portion 12 has a connection surface M for connecting the main circuit unit 3n to the other party. This connection surface M is flat and perpendicular to the virtual plane described above, so as to face the other party.
[0052] The shape of the connection surface M can be any shape, such as a circle or a rectangle. Furthermore, the second connection part 12 (connection surface M) is connected to the second stage fourth connection part 14 (connection surface M) as its counterpart.
[0053] The second connecting portion 12 has a predetermined set external dimension. That is, when viewed in a direction perpendicular to the virtual axis L, the distance dimension from the connecting surface M to the virtual axis L is set to satisfy the relationship A / 2 with respect to the pitch (distance, dimension value) A between the fifth stage first connecting portion 11 and the second connecting portion 12 described above.
[0054] In this main circuit structure 9, multiple main circuit units 3n to 7n are combined by connecting connection parts 11 to 14 having a fixed external dimension (A / 2) to each other. As a result, the multiple main circuit units 3n to 7n are arranged at equal intervals in the Z-axis direction from the bottom to the top of the enclosure 2 (panel). Consequently, the operation units 3p to 7p are also arranged at equal intervals along the same direction as the main circuit units 3n to 7n, and are configured to operate the main circuit units 3n to 7n.
[0055] The operation units 3p to 7p are arranged in the following order from bottom to top of the enclosure 2 (panel): the first stage is the operation unit 3p for the grounding device (ES), the second stage is the operation unit 4p for the disconnector (DS), the third stage is the operation unit 5p for the vacuum circuit breaker (VCB), the fourth stage is the operation unit 6p for the disconnector (DS), and the fifth stage is the operation unit 7p for the disconnector with grounding device (DS / ES).
[0056] In addition, the switchgear 1 described above is provided with busbars 25, 26, and 27 for inter-panel connections to electrically interconnect multiple switchgears 1. The connection positions of the busbars 25, 26, and 27 can be set at both the upper part 2t of the panel and the rear part 2p of the panel.
[0057] In Figure 1, as an example, the busbars at the top 2t of the panel (first busbar 25, second busbar 26) are connected to the first and second connection parts 11, 12 (connection surface M) which are integrated into the fifth-stage unit body Pm described above. The busbar at the back 2p of the panel (third busbar 27) is connected to the auxiliary connection part 15 which is integrated into the fourth-stage unit body Pm described above. These three busbars 25, 26, and 27 are composed of three phases (R phase, S phase, T phase), and the busbar tip parts 25b, 26b, and 27b, which will be described later, are set to be in different positions relative to each other.
[0058] Furthermore, in both the upper part 2t and the rear part 2p of the panel, the busbars 25, 26, and 27 are provided with busbar base ends 25a, 26a, and 27a that can be connected to connection parts 11, 12, and 15 integrated with the unit body Pm, and busbar tip ends 25b, 26b, and 27b that can be connected between panels.
[0059] In Figure 1, as an example, in the first busbar 25, the busbar tip 25b is set to a position offset in the -Y-axis direction relative to the busbar base 25a. In the second busbar 26, the busbar tip 26b is set to a position offset in the +Y-axis direction relative to the busbar base 26a. In the third busbar 27, the busbar tip 27b is set to a position offset in the +Z-axis direction relative to the busbar base 27a.
[0060] In this case, when the positional relationship between the busbar base ends 25a, 26a, 27a and the busbar tips 25b, 26b, 27b connected to the connection parts 11, 12, 15 is projected onto a virtual plane, the distance between the busbar base ends 25a, 26a, 27a and the busbar tips 25b, 26b, 27b is set to satisfy the relationship A / 2 with respect to the pitch (distance, dimension value) A between the first connection part 11 and the second connection part 12 described above. Note that the busbar tips 25b, 26b, 27b are configured to be able to be connected to their counterparts from both sides when viewed in the X-axis direction, and this configuration will be described later with reference to Figures 5 to 8.
[0061] Figure 2 is an internal diagram of the mold used to mold the main circuit units 3n to 7n of the five types of electrical equipment 3 to 7 described above. As an example, in Figure 2, the inside of the mold is configured by interconnecting a main body molding space area Pmf for molding the main body Pm of the unit and connection part molding space areas 11f, 12f, 13f, 14f, and 15f for molding the five connection parts 11 to 15.
[0062] As shown in Figure 2, the main body molding space region Pmf extends along the spatial center line Lf which coincides with the virtual axis L described above, and is configured with an outer contour that is symmetrical with respect to this spatial center line Lf. The connecting part molding space regions 11f to 15f are configured in pairs on each side of the spatial center line Lf, along a single virtual plane that overlaps with and extends parallel to the spatial center line Lf.
[0063] Specifically, with the spatial centerline Lf as the center, the first and second connection part molding spatial regions 11f and 12f are formed on one side, and the third and fourth connection part molding spatial regions 13f and 14f are formed on the other side. Furthermore, one auxiliary connection part molding spatial region 15f is formed at the end of the main body molding spatial region Pmf along this spatial centerline Lf.
[0064] The two connection part molded spatial regions (11f and 13f, 12f and 14f) formed on either side of the spatial centerline Lf are aligned in a positional relationship opposite to each other when viewed in a direction perpendicular to the spatial centerline Lf. The pitch (distance) between the two connection part molded spatial regions (11f and 12f, 13f and 14f) formed along the spatial centerline Lf is equal to the pitch (distance, dimensional value) A between the first connection part 11 and the second connection part 12 as described above, when viewed in a direction perpendicular to the spatial centerline Lf. Furthermore, the external dimensions of each connection part molded spatial region 11f to 15f satisfy the relationship A / 2 in a direction perpendicular to the spatial centerline Lf.
[0065] Figure 3 shows an example of a cast product molded by injecting insulating resin material into the mold shown in Figure 2. In Figure 3, as an example, with the second and third connection part molding space areas 12f and 13f closed, electrical components for a disconnector (DS) are set in the main body molding space area Pmf and the insulating resin material is injected.
[0066] This results in the formation of a cast product as shown in Figure 3. Specifically, a cast product is formed that matches the main circuit units 4n and 6n (unit body Pm, first and fourth connection parts 11 and 14, auxiliary connection part 15) of the second and fourth stage disconnectors 4 and 6 (DS) shown in Figure 1.
[0067] Figure 4 shows an example of a cast product molded by injecting insulating resin material into the mold shown in Figure 2. In Figure 4, as an example, with the first and fourth connection part molding space areas 11f, 14f and the auxiliary connection part molding space area 15f closed, electrical components for a vacuum circuit breaker (VCB) are set in the main body molding space area Pm and insulating resin material is injected.
[0068] This results in the formation of a cast product as shown in Figure 4. Specifically, a cast product is formed that matches the main circuit unit 5n (unit body Pm, second and third connection parts 12, 13) of the third stage vacuum circuit breaker 5 (VCB) shown in Figure 1.
[0069] Figure 5 is a diagram showing the parallel connection of the first busbars 25 between panels at the upper part 2t of the panel. Figure 5 shows two switchgears 1 arranged along a predetermined panel arrangement direction (i.e., the X-axis direction), and the busbar base ends 25a of the first busbars 25 provided on both switchgears 1 are connected to the first connection part 11 (connection surface M) of the main circuit unit 7n (see Figure 1).
[0070] As shown in Figure 5, when two adjacent switchgears 1 are viewed in the panel arrangement direction, and the busbar tip 25b of one switchgear 1 faces the busbar tip 25b of the other switchgear 1, both busbar tips 25b are connected directly via the connecting line 28. In this case, the positions of the two busbar tips 25b are different in the Z-axis direction, and their positions in the X-axis direction are opposite to each other. When viewed in the X-axis direction, the same phases (R phase, S phase, T phase) on both busbar tips 25b are positioned opposite each other. This makes it possible to connect the first busbars 25 between panels without interfering with each other's connecting lines 28.
[0071] Figure 6 is a diagram showing the alternate arrangement of the first busbar 25 and the second busbar 26 between panels at the upper part 2t of the panel. Figure 6 shows that two switchgears 1 are arranged along a predetermined panel arrangement direction (i.e., the X-axis direction), and the busbar base end 25a of the first busbar 25 provided on one switchgear 1 is connected to the first connection part 11 (connection surface M) of the main circuit unit 7n, while the busbar base end 26a of the second busbar 26 provided on the other switchgear 1 is connected to the second connection part 12 (connection surface M) of the main circuit unit 7n (see Figure 1).
[0072] As shown in Figure 6, when two adjacent switchgears 1 are viewed in the panel arrangement direction, if the busbar tip 25b of one switchgear 1 and the busbar tip 26b of the other switchgear 1 are not facing each other, the busbar tip 25b is positioned in the +Y direction relative to the busbar base end 25a (see Figure 1), and the busbar tip 26b is positioned in the -Y direction relative to the busbar base end 26a (see Figure 1), and connected to the connection parts 11 and 12 of the main circuit unit 7n.
[0073] At this time, as shown in Figure 6, the ends 25b and 26b of both busbars are positioned opposite each other. In this case, the positions of the ends 25b and 26b in the Z-axis direction are different from each other, and their positions in the X-axis direction are opposite to each other. At this time, when viewed in the X-axis direction, the same phases (R phase, S phase, T phase) at the ends 25b and 26b of both busbars are positioned opposite each other. This makes it possible to connect the first busbar 25 and the second busbar 26 between panels without interfering with each other's connection lines 28.
[0074] Figure 7 is a diagram showing the parallel connection of the third busbars 27 between panels at the rear panel 2p. Figure 7 shows two switchgears 1 arranged along a predetermined panel arrangement direction (i.e., the X-axis direction), and the busbar base ends 27a of the third busbars 27 provided on both switchgears 1 are connected to the fourth stage auxiliary connection part 15 of the main circuit unit 6n (see Figure 1).
[0075] As shown in Figure 7, when two adjacent switchgears 1 are viewed in the panel arrangement direction, and the busbar tip 27b of one switchgear 1 faces the busbar tip 27b of the other switchgear 1, the two busbar tips 27b are connected directly via the connecting line 28. In this case, the positions of the two busbar tips 27b are different in the Y-axis direction, and their positions in the X-axis direction are opposite to each other. When viewed in the X-axis direction, the same phases (R phase, S phase, T phase) at the two busbar tips 27b are positioned opposite each other. This makes it possible to connect the third busbars 27 between panels without interfering with each other's connecting lines 28.
[0076] Figure 8 is a diagram showing the alternate arrangement of the third busbars 27 between panels at the rear panel 2p. Figure 8 shows two switchgears 1 arranged along a predetermined panel arrangement direction (i.e., the X-axis direction), with the busbar base end 27a of the third busbar 27 provided on one switchgear 1 connected to the fourth-stage auxiliary connection part 15 of the main circuit unit 6n, and the busbar base end 27a of the third busbar 27 provided on the other switchgear 1 connected to the third-stage auxiliary connection part (not shown) of the main circuit unit 5n (see Figure 1).
[0077] As shown in Figure 8, when two adjacent switchgears 1 are viewed in the panel arrangement direction, if the busbar tip 27b of one switchgear 1 and the busbar tip 27b of the other switchgear 1 are not facing each other, one busbar tip 27b is positioned in the -Z direction relative to the busbar base end 27a (see Figure 1), and the other busbar tip 27b is positioned in the +Z direction relative to the busbar base end 27a (see Figure 1), and connected to the auxiliary connection part 15 of the main circuit units 5n and 6n.
[0078] At this time, as shown in Figure 8, the two busbar tips 27b are positioned opposite each other. In this case, the positions of the two busbar tips 27b in the Y-axis direction are different from each other, and their positions in the X-axis direction are opposite each other. At this time, when viewed in the X-axis direction, the same phases (R phase, S phase, T phase) at the two busbar tips 27b are positioned opposite each other. This makes it possible to connect the third busbars 27 between panels without interfering with each other's connection lines 28.
[0079] As described above, according to this embodiment, the connection parts 11 to 14 for connecting the main circuit units 3n to 7n can be integrated into the unit body Pm. As a result, the number of parts is significantly reduced compared to conventional designs, and consequently, manufacturing costs can be drastically reduced.
[0080] According to this embodiment, the arrangement configuration and external dimensions of the connection parts 11 to 14 in the main circuit units 3n to 7n can be made equivalent (unified). As a result, the main circuit units 3n to 7n can be arranged at uniform intervals (for example, at equal intervals) along a predetermined direction. This makes it easier to configure the control panel compared to conventional designs.
[0081] According to this embodiment, by arranging the main circuit units 3n to 7n at uniform intervals (i.e., equal intervals), the housing 2 or switchgear 1 that houses the main circuit units 3n to 7n can be made smaller accordingly.
[0082] According to this embodiment, by making the arrangement and external dimensions of the connection parts 11 to 14 mutually equivalent (unified), the connection positions of the busbars 25 to 27 can be expanded to a wide range, extending not only to the upper part 2t of the panel but also to the rear part 2p of the panel. This improves the degree of freedom in the connection positions of the busbars 25 to 27, and as a result, makes it easier to configure the panel.
[0083] According to this embodiment, when multiple switchgears 1, each having a different main circuit structure 9, are arranged along the panel arrangement direction, the main circuit units 3n to 7n are configured to be reusable when constructing the different main circuit structures 9 of the multiple switchgears 1. This reduces the effort and cost required for panel configuration compared to conventional methods.
[0084] "Second Embodiment" Figure 9 is a basic structural diagram for realizing the main circuit units 3n to 7n according to the second embodiment. In the first embodiment described above, the main circuit units 3n to 7n were assumed to have the necessary connection parts 11 to 15 pre-integrated. However, in this embodiment, the connection parts (first to fourth connection parts 11 to 14, auxiliary connection part 15) are molded separately from the unit body Pm. As an example, Figure 9 shows a state in which all the separately molded connection parts 11 to 15 are retrofitted to the unit body Pm.
[0085] As shown in Figure 9, each of the connection parts 11 to 15 has the same external dimensions. In this case, for example, with the main body molding space area inside the mold shown in Figure 2 closed, insulating resin material is injected only into each connection part molding space area 11f to 15f. This makes it possible to mold multiple connection parts 11 to 15 having the same contour shape simultaneously.
[0086] Then, the necessary connection parts (for example, the first connection part 11 and the fourth connection part 14) are selected from these multiple connection parts 11 to 15 and integrated into the unit body part Pm as an add-on. As a result, it is possible to realize cast parts that match the main circuit units 4n and 6n (unit body part Pm, first and fourth connection parts 11 and 14) of the disconnectors 4 and 6 (DS) as shown in Figure 3. For the add-on method, for example, screw fastening, welding, or brazing can be applied.
[0087] As described above, according to this embodiment, multiple connection parts 11 to 15 having the same contour shape can be prepared in advance, and thereafter, by simply attaching the connection parts 11 to 15 to the unit body part Pm, main circuit units 3n to 7n that meet the needs can be realized easily and quickly. This dramatically improves the efficiency and streamlining of the panel configuration. Note that other configurations and effects are the same as those of the first embodiment described above, so their explanation will be omitted.
[0088] "First Variation" Figure 10 is a cross-sectional view of a main circuit unit relating to the first modified example of a split type. As an example, Figure 10 shows main circuit units 4n and 6n of disconnectors 4 and 6 (DS) equipped with two divided unit body parts Pm. The unit body part Pm is constructed by joining two resin parts Pm1 and Pm2 together so as to divide the air space 22, which does not contain electrical components, into two parts.
[0089] As shown in Figure 10, electrical components for forming a single electrical device are distributed and arranged on both resin parts Pm1 and Pm2, and an insulating resin layer 16 is provided molded to cover each electrical component. Furthermore, a space is provided at the joint between each resin part Pm1 and Pm2, which serves as a component of the air space 22. When both resin parts Pm1 and Pm2 are joined together, a single air space 22 is formed between the electrical components.
[0090] In this case, as a method for molding the two divided unit body parts Pm (resin parts Pm1 and Pm2), for example, insulating resin material is injected inside the mold shown in Figure 2 while temporarily avoiding the movable electrode 20, thereby molding the two resin parts Pm1 and Pm2.
[0091] Next, by joining the two resin parts Pm1 and Pm2, cast parts are formed that match the main circuit units 4n and 6n (unit body Pm, first and fourth connection parts 11 and 14) of the second and fourth stage disconnectors 4 and 6 (DS) shown in Figure 1.
[0092] As described above, according to the first modification, by joining two resin parts Pm1 and Pm2 to each other so as to divide the air space 22 into two, it becomes possible to easily demold the mold for forming the air space 22, and as a result, the manufacturing efficiency of the resin parts Pm1 and Pm2 can be improved. The other configurations and effects are the same as those of the first embodiment described above, so their explanation will be omitted.
[0093] "Second variation" Figure 11 is a cross-sectional view of a main circuit unit relating to a second modified example of a divided type. As an example, Figure 11 shows main circuit units 4n and 6n of disconnectors 4 and 6 (DS) equipped with three divided unit body sections Pm. The unit body section Pm is constructed by joining three resin parts Pm3, Pm4, and Pm5 together to divide the air space 22, which does not contain electrical components, into three sections. Specifically, one resin part Pm5 is joined between two resin parts Pm3 and Pm4.
[0094] As shown in Figure 11, electrical components for a single electrical device are distributed and arranged in two resin parts Pm3 and Pm4, and an insulating resin layer 16 is provided to cover each electrical component. One resin part Pm5 has only a space that serves as a component of the air space 22, and an insulating resin layer 16 is provided to cover only that space. Furthermore, each of the resin parts Pm3 and Pm4 has a space at its joint that serves as a component of the air space 22. When one resin part Pm5 is joined between the two resin parts Pm3 and Pm4, a single air space 22 is formed between the electrical components.
[0095] In this case, one method for molding the three divided unit body Pm (resin parts Pm3, Pm4, Pm5) is to inject insulating resin material into the mold shown in Figure 2 while temporarily avoiding the movable electrode 20, thereby molding the three resin parts Pm3, Pm4, and Pm5.
[0096] Next, by joining the three resin parts Pm3, Pm4, and Pm5, a cast product is formed that matches the main circuit units 4n and 6n (unit body Pm, first and fourth connection parts 11 and 14) of the second and fourth stage disconnectors 4 and 6 (DS) shown in Figure 1.
[0097] As described above, according to the second modified example, by joining three resin parts Pm3, Pm4, and Pm5 together so as to divide the air space 22 into three sections, it becomes possible to easily demold the mold for forming the air space 22, and as a result, the manufacturing efficiency of the resin parts Pm3, Pm4, and Pm5 can be improved. The other configurations and effects are the same as those of the first embodiment described above, so their explanation will be omitted.
[0098] "Third Variation" Figure 12 is an assembly diagram of the main circuit unit according to the third modified example. As shown in Figure 12, in this modified example, it is sufficient to prepare main circuit units 3n to 7n, each having a unit body Pm that integrates all the connection parts 11 to 15. When constructing the main circuit structure 9, the main circuit units 3n to 7n are simply stacked on top of each other so that the connection surfaces M of the connection parts 11 to 15 are in contact with each other.
[0099] In this case, for the unused connection parts 11 to 15, insulating material 29 can be inserted between the connection surfaces M of those connection parts. In the example in Figure 12, insulating material 29 is inserted between the second connection part 12 and the fourth connection part 14 (between the connection surfaces M). By repeating this process, for example, a main circuit structure 9 as shown in Figure 1 can be constructed.
[0100] As described above, according to this modified version, without considering unused connection parts, insulating resin material can be injected into the mold interior shown in Figure 2 (main body molding space area Pmf, connection part molding space areas 11f~15f). Therefore, the manufacturing process for main circuit units 3n~7n is simplified and shortened, resulting in a significant reduction in manufacturing costs. In addition, since only one type of mold is needed, there are no problems with mold storage space. Note that other configurations and effects are the same as those of the first embodiment described above, so their explanation is omitted.
[0101] Although one embodiment of the present invention and several variations have been described above, these embodiments and variations are presented as examples and are not intended to limit the scope of the invention. These embodiments and variations can be implemented in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of symbols]
[0102] 1...Switchgear, 2...Enclosure (panel), 2t...Top of panel, 2p...Rear of panel, 3...Grounding device (ES), 4,6...Disconnector (DS), 5...Vacuum circuit breaker (VCB), 7...Disconnector with grounding device (DS / ES), 8...Partition wall, 9...Main circuit structure, 10...Operation structure, 11,12,13,14,15...Connection part, 16...Insulating resin layer, 17,18...Fixed electrode, 19...Vacuum valve, 20...Movable electrode, 21,22...Air space, 23...Grounding electrode, 24...Power supply line, 25,26,27...Bus line, 28...Connection line, L...Virtual axis line, M...Connection surface, Pm...Unit body, Pmf...Main body molded space area, 11f,12f,13f,14f,15f...Connection part molded space area.
Claims
1. A main circuit unit provided in a switchgear housing various electrical equipment used for power distribution, for constructing a main circuit structure through which current flows during power distribution, A unit body equipped with electrical components for constituting the aforementioned electrical equipment, One or more connecting parts that can be integrated into the main body of the unit and have predetermined external dimensions, The unit comprises an insulating resin layer molded to form the overall outer contour including both the unit body portion into which the connecting portion is integrated and the connecting portion, In a state in which a main circuit structure is constructed by connecting the connecting parts integrated into the main body of the unit to each other, the main circuit units are arranged at equal intervals along a predetermined direction.
2. The main body of the unit extends along a straight virtual axis and is configured with an outer contour that is symmetrical with respect to the virtual axis. Along a virtual plane that overlaps with and extends parallel to the virtual axis, the unit body can have one or more connecting parts integrated on one or both sides of the virtual axis, The main circuit unit according to claim 1, in which a plurality of the connection parts are integrated on one or both sides of the virtual axis, the pitch between two adjacent connection parts, when viewed in the direction along the virtual axis, is set to a predetermined constant dimension.
3. In order to connect the main circuit unit to the other party, the connection portion has a flat connection surface perpendicular to the virtual plane so as to face the other party. The main circuit unit according to claim 2, wherein, when viewed in a direction perpendicular to the virtual axis, the distance dimension from the connection surface to the virtual axis is set to satisfy the relationship A / 2, where A is the pitch which is set to a constant dimension.
4. The main circuit unit according to claim 2, wherein the connecting portion is molded integrally with the unit body, thereby enabling integration with the unit body.
5. The main circuit unit according to claim 2, wherein the connecting portion is molded separately from the main unit body and can be integrated with the main unit body by being attached to the main unit body afterwards.
6. The main body of the unit is constructed by joining together multiple resin parts so as to divide the air space where the electrical components are absent into multiple sections. Multiple resin parts are arranged with the electrical components necessary to constitute a single electrical device. The main circuit unit according to claim 2, wherein a single air space is formed between the electrical components when the multiple resin parts are joined together.
7. A switchgear in which the main circuit structure is constructed by combining the main circuit units described in any one of claims 2 to 6, A busbar for inter-panel connections is provided to electrically interconnect multiple of the aforementioned switchgears. The busbar connection position can be set at both the top and back of the panel. In both the upper part and the back part of the panel, the busbar is, A busbar base end that can be connected to the connection part integrated with the main circuit unit, It is equipped with a busbar tip that can be connected between panels, In a state where the positional relationship between the busbar base end and the busbar tip end connected to the connection part is projected onto the virtual plane, the distance between the busbar base end and the busbar tip end is set to satisfy the relationship A / 2, where A is the pitch between the connection parts which are set to a constant dimension.
8. In a state where a plurality of the switchgears are arranged along a predetermined panel arrangement direction, and the base ends of the busbars provided on these switchgears are connected to the connection portion of the main circuit unit, When viewing two adjacent switchgears in the direction of the panel arrangement, When the busbar tip of one switchgear and the busbar tip of the other switchgear face each other, it is possible to connect the two busbar tips directly to each other. The switchgear according to claim 7, in cases where the busbar tip of one switchgear and the busbar tip of the other switchgear are not facing each other, the orientation of one or both of the busbar base ends is reversed and connected to the connection part of the main circuit unit so that the busbar tips of both are facing each other, thereby enabling inter-panel connection.
9. The switchgear has its interior partitioned by a partition wall. The main circuit structure is housed on one side of the partition wall, and an operating structure that controls the flow of current by operating the main circuit structure is housed on the other side of the partition wall. Each of the aforementioned electrical devices is configured by being divided into a main circuit unit for constructing the main circuit structure and an operating unit for constructing the operating structure. The switchgear according to claim 7, wherein the operating unit is arranged at equal intervals along the same direction as the main circuit unit and is configured to operate the main circuit unit.
10. In a state in which a plurality of switchgears, each having a different main circuit structure, are arranged along the panel arrangement direction, The switchgear according to claim 8, wherein the main circuit unit is configured to be reused as is to construct different main circuit structures for a plurality of the switchgears.