Plug-in electric circuit and power distribution system supporting multiple types of ac current and voltage values

Abstract

To realize support to multiple types of AC current and voltage values with conductors being arranged in three rows, two outer rows of which have conductors that extend from one end to the other end, and the center row of which has conductors from the middle part and to the middle part.SOLUTION: A plug-in electric circuit 1 has a plug-in mounting part 2 to which a plug-in device P can be mounted. Approximately plate-shaped conductors 3 are arranged in three rows approximately in a longitudinal direction 2L of the plug-in mounting part 2. The two outer rows thereof have conductors 3 extending from one end to the other end of the plug-in mounting part 2, and the central row thereof has conductors 3 up to the middle of the plug-in mounting part 2 and conductors 3 from the middle. Also, a power distribution system 10 with a transformer 4 that outputs AC current to the plug-in electric circuit 1 is provided. The transformer 4 has two or more coils, one of which is Δ-connection or V-connection, and is equipped with U, V, W, O terminals. The conductors 3 of the two outer rows may be connected to the U, W terminals, the conductors 3 up to the middle of the central row may be connected to the V terminal, and the conductors 3 from the middle may be connected to the O terminal, etc.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a plug-in electric circuit having a plug-in mounting portion to which a plug-in device can be attached, and a power distribution system having this plug-in electric circuit. [Background technology]

[0002] BACKGROUND ART Bus ducts to which plug-in devices such as plug-in breakers are attached are known (see Patent Document 1). This bus duct is a bus duct that stores and holds multiple plate-shaped conductors within a housing, and has a plug-in hole portion for attaching a plug-in device to the housing, and an inspection window located opposite the plug-in hole portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-229358 Summary of the Invention [Problem to be solved by the invention]

[0004] However, as shown in FIG. 1 of the bus duct described in Patent Document 1, all of the conductors are composed of a single wire extending from one end of the housing to the other. Therefore, no matter where in the housing the plug-in device is attached, only one type of AC current or voltage value (for example, 210V for three-phase three-wire or 105V for single-phase three-wire) can be output. Therefore, it cannot handle cases where a different type of AC current or voltage value is suddenly required (for example, when not only a three-phase three-wire 210V power load but also a single-phase three-wire 105V lighting load is required, or vice versa). In this case, it is possible to address the issue by installing another bus duct, but this would increase the burden of installation work and incur additional costs such as installation costs.

[0005] In view of these points, the present invention aims to provide a plug-in cable and power distribution system that can "accommodate multiple types of AC current and voltage values" and "reduce installation burden and costs" by arranging conductors in three rows, with the outer two rows being conductors that extend from one end to the other, and the central row being conductors up to the middle and conductors that start from the middle. [Means for solving the problem]

[0006] A first feature of the plug-in electric circuit 1 according to the present invention is a plug-in electric circuit having a plug-in mounting section 2 to which a plug-in device P can be attached, the plug-in mounting section 2 having a longitudinal direction 2L and a plurality of substantially plate-shaped conductors 3 arranged in three rows substantially along the longitudinal direction 2L, with one conductor 3 extending from one end to the other end of the plug-in mounting section 2 in the longitudinal direction 2L in each of the two outer rows, and one conductor 3 extending from one end to the middle of the plug-in mounting section 2 in the longitudinal direction 2L in the central row of the three rows being provided, and another conductor 3 extending from the middle to the other end of the plug-in mounting section 2 in the longitudinal direction 2L in the central row being provided.

[0007] A power distribution system (10) according to the present invention is a power distribution system including a plug-in electric circuit (1) having the above-described characteristics and a transformer (4) that outputs AC current to the plug-in electric circuit (1), wherein the transformer (4) has two or more windings, at least one of which is a delta-connection or a V-connection, and the delta-connection or V-connection winding has a U-terminal, a V-terminal, and a W-terminal as well as an O-terminal located midway between the U-terminal and the W-terminal, one of the conductors (3) provided in each of the two outer rows is connected to the U-terminal, the other of the conductors (3) provided in each of the two outer rows is connected to the W-terminal, one of the two conductors (3) provided in the central row is connected to the V-terminal, and the other of the two conductors (3) provided in the central row is connected to the O-terminal.

[0008] A second feature of the power distribution system 10 according to the present invention is that, in addition to the first feature, it also has a panel housing 5 in which the plug-in electrical circuit 1 is provided, the panel housing 5 has a longitudinal direction 5L, and the plug-in electrical circuit 1 is arranged inside the panel housing 5 so that the longitudinal direction 5L of the panel housing 5 and the longitudinal direction 2L of the plug-in mounting portion 2 of the plug-in electrical circuit 1 are approximately parallel to each other.

[0009] A third feature of the power distribution system 10 according to the present invention is that it is a power distribution system having a plug-in electric circuit 1 having the above-described features and a panel housing 5 in which the plug-in electric circuit 1 is provided, wherein the panel housing 5 has a longitudinal direction 5L, and the plug-in electric circuit 1 is arranged inside the panel housing 5 so that the longitudinal direction 5L of the panel housing 5 and the longitudinal direction 2L of the plug-in mounting portion 2 of the plug-in electric circuit 1 are approximately parallel to each other.

[0010] Due to these characteristics, the approximately plate-shaped conductors 3 are arranged in three rows approximately along the longitudinal direction 2L of the plug-in mounting portion 2, and the two outer rows are conductors 3 extending from one end to the other end of the plug-in mounting portion 2, and the central row is conductors 3 extending to the middle of the plug-in mounting portion 2 and conductors 3 from the middle portion.As a result, unlike Patent Document 1, the AC current and voltage values ​​when the plug-in device P is attached at a position spanning the conductors 3 up to the middle portion (for example, 210V for three-phase three-wire) can be different from the AC current and voltage values ​​when the plug-in device P is attached at a position spanning the conductors 3 from the middle portion (for example, 105V for single-phase three-wire), and this makes it possible to respond even if a different type of AC current or voltage value is suddenly required ("response to multiple types of AC current and voltage values"). Therefore, even in this case, there is no need to install another electrical circuit, which reduces the burden of installation work and unnecessary costs such as installation fees ("reduced installation burden and costs"). The plug-in circuit 1 can also be said to be a "plug-in circuit that supports a variety of AC current and voltage values."

[0011] Furthermore, a power distribution system 10 having a transformer 4 that outputs AC current to a plug-in circuit 1 has two or more windings, one of which is delta-connected or V-connected and equipped with U, V, W, and O terminals, with the outer two rows of conductors 3 connected to the U and W terminals, the conductors 3 up to the middle of the central row connected to the V terminal, and the conductor 3 from the middle row connected to the O terminal. This makes it possible to output a variety of AC current and voltage values ​​from the delta-connected windings of the transformer 4 to the plug-in device P, and the power distribution system 10 can accommodate a wider range of loads, for example, a 210V power load over a three-phase three-wire system and a 105V lighting load over a single-phase three-wire system.

[0012] Furthermore, by arranging the plug-in circuit 1 inside the panel housing 5 so that the longitudinal direction 5L of the panel housing 5 and the longitudinal direction 2L of the plug-in mounting portion 2 are approximately parallel, the panel housing 5 of the power distribution system 10 can be made compact while the plug-in mounting portion 2 can be made as long as possible, making it possible to mount more plug-in devices P. [Effects of the Invention]

[0013] In the plug-in electrical circuit and power distribution system of the present invention, the conductors are arranged in three rows, with the outer two rows being conductors extending from one end to the other end, and the central row being conductors up to the middle and conductors starting from the middle, making it possible to "accommodate multiple types of AC current and voltage values" and "reduce installation burden and costs." [Brief explanation of the drawings]

[0014] [Figure 1] This is a circuit diagram showing an outline of a plug-in electric circuit and a power distribution system (when the transformer has two windings and is delta-connected) according to the present invention. Note that "105V" and "210V" in the diagram are examples of voltage values ​​of AC current output from the plug-in electric circuit. [Figure 2] This is a circuit diagram showing an outline of a plug-in circuit and power distribution system (when the transformer has three windings and is V-connected). Note that "105V" and "210V" in the diagram are examples of voltage values ​​of the AC current output from the plug-in circuit. [Figure 3] A front view showing the plug-in circuit, power distribution system, transformer, and panel housing. [Figure 4] A side view showing the plug-in circuit, power distribution system, transformer, and panel housing. [Figure 5] This is a plan view showing the plug-in circuit, power distribution system, transformer, and panel housing. [Figure 6] 1 is a front view showing a plug-in device attached to a plug-in attachment portion of a plug-in electrical circuit. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. <Overall configuration of Plug-in Cable Circuit 1> As shown in FIGS. 1 to 6, a plug-in electrical circuit 1 according to the present invention has a plug-in mounting portion 2, which will be described later. Furthermore, a power distribution system 10 (described later) may include the plug-in power line 1. Here, a general "electrical circuit" including the plug-in electric circuit 1 of the present invention is something that allows electricity (current) to flow, such as a conductor of copper, aluminum, silver, gold, nichrome, etc., a cable in which such a conductor is covered with an insulator, or a general electric wire, but in the following description, the part that allows electricity to flow in the plug-in electric circuit 1 is conductor 3, which will be described later.

[0016] It can also be said that the plug-in circuit 1 outputs a plurality of types of AC current and voltage values ​​to a plug-in device P, which will be described later. The multiple types of AC current and voltage values ​​output from the plug-in circuit 1 are not particularly limited, and may be, for example, three-phase three-wire (3φ3w) and single-phase three-wire (1φ3w), or three-phase three-wire and single-phase two-wire (1φ2w), or single-phase two-wire and single-phase three-wire, and the multiple types of voltage values ​​may be 210V and 105V, 200V and 100V, or 420V and 210V, 400V and 200V, etc.

[0017] Here, the current, breaking current, voltage, power, and capacity in the present invention may be values ​​within a rated range, in which case they can be referred to as rated current, rated breaking current, rated voltage, rated power, and rated capacity. These rated currents, etc. can be said to be limit values ​​of power, etc. guaranteed by the manufacturer to ensure the safe use of electrical appliances, and further, ratings can be said to be the usage limits and conditions that guarantee the safe and proper operation of equipment and devices. Furthermore, when the current in the present invention is AC, the current value (current value), the interrupting current value (interrupting current value), the voltage value (voltage value), the power value (power value), and the capacity value (capacity value) may be effective values. First, a plug-in device P that outputs a plurality of types of AC current and voltage values ​​from such a plug-in electrical circuit 1 will be described.

[0018] <Plug-in device P> As shown in Figures 1 to 3, 5, and 6, the plug-in devices P are devices that are attached to the plug-in attachment section 2 described below, and each plug-in device P outputs one of a plurality of types of AC current and voltage values ​​from the plug-in electric circuit 1. The specific configuration of the plug-in device P is not particularly limited, and may be, for example, a circuit breaker. When the plug-in device P is a circuit breaker, the circuit breaker may be, for example, what is also called a bus plug-in breaker (BPM, Bus Plug in Molded Case Circuit Breaker (MCCB)), and specifically may be a plug-in earth leakage circuit breaker (ELCB) or a plug-in molded case circuit breaker (MCCB), or may also be a vacuum circuit breaker (VCB) or an air circuit breaker (ACB). Alternatively, the plug-in device P may be a plug-in surge protective device (SPD) or a plug-in transducer. Here, a transducer is generally considered to be a converter, and specifically may be a device having a current transformer (CT) and a terminal for outputting the measurement result of the current transformer, a voltage transformer (VT) and a terminal for outputting the measurement result of the voltage transformer, or both a current transformer and a voltage transformer and terminals for outputting the measurement results of these. Hereinafter, the plug-in device P will be described as being mainly a circuit breaker (hereinafter also referred to as a "plug-in breaker").

[0019] The shape of the plug-in device P is not particularly limited, but may be, for example, an approximately rectangular parallelepiped, or may be an approximately cubic shape, or an approximately rectangular parallelepiped shape with a narrow width (or an approximately plate shape with a thick thickness), etc. Here, the term "substantially rectangular parallelepiped" in the present invention does not only refer to a strict rectangular parallelepiped shape, but also includes a rectangular parallelepiped shape in which some unevenness is formed on each surface due to each component, terminal, etc. Furthermore, the term "substantially plate-like" in the present invention does not only refer to a strict plate, but also includes a plate in which some unevenness is formed on each surface due to each component, terminal, etc. When the plug-in device P has a substantially rectangular parallelepiped shape, the plug-in device P has a longitudinal direction PL, and naturally has a predetermined length Pn (length along the longitudinal direction PL), as well as a predetermined width Pw (length along a direction perpendicular to the longitudinal direction PL (i.e., width direction)) and a predetermined height Ph (length along a direction perpendicular to the longitudinal direction PL and width direction (i.e., height direction)). The relationship between the longitudinal direction PL, length Pn, width Pw, and height Ph of the plug-in device P and the longitudinal direction 2L, etc., of the plug-in mounting portion 2, which will be described later, will be described later. In the following description, the plug-in device P will be mainly described as having a substantially rectangular parallelepiped shape. Furthermore, in the plug-in device P, on the side that is attached to the plug-in mounting section 2 described later (i.e., the back side), grooves that allow conductivity across the conductors 3 described later (or into which the conductors 3 fit to allow conductivity) or multiple terminals (as many as the number of rows of conductors 3 described later) that protrude toward the plug-in mounting section 2 and come into contact with the conductors 3 to allow conductivity may be formed.

[0020] <Plug-in mounting part 2> As shown in FIGS. 1 to 6, the plug-in mounting portion 2 is a portion to which the above-mentioned plug-in device P can be mounted. The plug-in mounting portion 2 has a longitudinal direction 2L, and a plurality of conductors 3 (described later) are arranged (side by side) in three rows substantially along this longitudinal direction 2L. Here, in the present invention, "substantially along" the longitudinal direction 2L, etc. does not only mean being strictly along the longitudinal direction 2L, etc. (being parallel to the longitudinal direction 2L, etc.), but also includes being deviated (slanted) by less than 1 degree, or by 1 degree, 2 degrees, or several degrees from being strictly along the longitudinal direction (strictly parallel).

[0021] The specific configuration of the plug-in mounting portion 2 is not particularly limited, but for example, it may include a plug-in housing 2a having a substantially rectangular parallelepiped shape that surrounds a plurality of conductors 3 arranged side by side in three rows, and the plug-in housing 2a may have an opening 2b to which the plug-in device P can be attached on the front side (the front surface, so to speak) of the faces of the plug-in housing 2a on which the plurality of conductors 3 arranged side by side can be seen at a glance (the largest face). The relationship between the opening 2b of the plug-in housing 2a and the plug-in device P will be explained in detail as follows: <1> When the opening 2b opens almost the entire front surface of the plug-in housing 2a, three grooves spanning the conductors 3 (more specifically, grooves spanning each of the three rows of conductors 3 arranged side by side) are formed on the back side of the plug-in device P, <2> When three openings 2b are opened in stripes on the front surface of the plug-in housing 2a, approximately along each of the three rows of conductors 3 arranged side by side, three terminals are formed protruding toward the plug-in mounting portion 2 (more specifically, terminals protruding toward each row of the three rows of conductors 3 arranged side by side), <3> Even when the openings 2b are formed on the front surface of the plug-in housing 2a with a set of three holes (for example, square or circular holes) at predetermined intervals approximately along each row of the conductors 3 arranged in three rows, three terminals protruding toward the plug-in mounting portion 2 are formed.

[0022] Alternatively, the plug-in mounting portion 2 may not have a plug-in housing 2a, but may be one or more fixtures that secure the multiple conductors 3 in a side-by-side arrangement to another support (for example, the panel housing 5 described below), or may be a plate-like body that supports the multiple conductors 3 that are side-by-side arranged on the side opposite to the side where the plug-in device P is mounted, and a fixture that secures the conductors 3 to the plate-like body, and in these cases, each conductor 3 will be almost exposed. In addition, when each conductor 3 is almost exposed in this way, <1> As in the case of (1), three grooves spanning the conductor 3 are formed on the back side of the plug-in device P. Hereinafter, the plug-in mounting portion 2 will be described as mainly including a plug-in housing 2a.

[0023] As described above, the plug-in mounting portion 2 has a longitudinal direction 2L, and therefore the plug-in mounting portion 2 (plug-in housing 2a) naturally has a predetermined length (length along the longitudinal direction 2L) 2n, as well as a predetermined width (length along a direction perpendicular to the longitudinal direction 2L (in other words, the width direction)) 2w and a predetermined height (length along a direction perpendicular to the longitudinal direction 2L and the width direction (in other words, the height direction)) 2h. Regarding the relationship between the longitudinal direction 2L, length 2n, width 2w, and height 2h of this plug-in mounting portion 2 and the longitudinal direction PL, length Pn, width Pw, and height Ph of the plug-in device P described above, first referring to the longitudinal direction, the longitudinal direction 2L of the plug-in mounting portion 2 and the longitudinal direction PL of the plug-in device P are approximately perpendicular when viewed from the front (see Figures 3, 6, etc.). Here, in the present invention, the longitudinal direction 2L and the longitudinal direction PL, etc. being "approximately perpendicular" does not only mean that the longitudinal direction 2L and the longitudinal direction PL, etc. are strictly perpendicular, but also includes being deviated (slanted) from being strictly perpendicular by less than 1 degree, or by 1 degree, 2 degrees, or several degrees. The relationship between the length 2n of the plug-in mounting portion 2 and the width Pw of the plug-in device P is such that the length 2n of the plug-in mounting portion 2 is greater than the sum of the widths Pw of the multiple (total number N) plug-in devices P (expressed as an equation, 2n > (Pw1 + Pw2 + + Pw N )=Σ N i=1 Pw i ), if the widths Pw of all the plug-in devices P are the same value, then 2n>Pw×N. If there is a predetermined device gap Ps between adjacent plug-in devices P, then the length 2n of the plug-in mounting portion 2 is approximately equal to the sum of the widths Pw of the multiple plug-in devices P and the device gap Ps (2n≒Σ N i=1 Pw i +Ps, or 2n ≈ Pw × N + Ps) (see FIG. 6). It can be said that the relationship between the length 2n of the plug-in mounting section 2 and the width Pw of the plug-in device P is the same even if the plug-in mounting section 2 does not have a plug-in housing 2a and each conductor 3 is almost exposed. Furthermore, the number of plug-in devices P that can be mounted on one plug-in mounting section 2 is not particularly limited, but may be two or more, and preferably four or more. Here, in the present invention, the sum of the length 2n and the width Pw, etc. being "substantially equal" does not only mean that the sum of the length 2n and the width Pw, etc. are strictly equal, but also includes a difference of less than 1 mm, 1 mm, 2 mm, or several mm from the strictly equal value. Furthermore, the relationship between the width 2w of the plug-in mounting portion 2 (plug-in housing 2a) and the length Pn of the plug-in device P is such that the width 2w of the plug-in mounting portion 2 is approximately equal to the length Pn of the plug-in device P (2w≈Pn) (see Figure 6). It can be said that there is no particular relationship between the height 2h of the plug-in mounting section 2 (plug-in housing 2a) and the height Ph of the plug-in device P, but when the opening 2b of the plug-in mounting section 2 opens over almost the entire front surface of the plug-in housing 2a, the relationship between the height (depth) Ph' of the portion (insertion portion) where the plug-in device P enters this opening 2b and the height 2h of the plug-in mounting section 2 can also be said to be such that the height Ph' of the insertion portion of the plug-in device P is smaller than the height 2h of the plug-in mounting section 2 (Ph'<2h).

[0024] <Conductor 3> 1 to 6, the conductors 3 are a plurality of substantially plate-shaped conductors (so-called plug-in conductors) arranged in three rows substantially along the longitudinal direction 2L of the plug-in mounting portion 2 described above, and therefore each conductor 3 also has its own longitudinal direction 3L. Note that the longitudinal direction 3L of each conductor 3 can be said to be substantially parallel to the longitudinal direction 2L of the plug-in mounting portion 2, and the conductors 3 are also called bus bars. Of the three rows in which a plurality of conductors 3 are arranged in parallel, each of the two outermost rows is provided with one longer conductor 3 (hereinafter also referred to as "outer long conductor 3A, 3B"). Furthermore, of the three rows in which multiple conductors 3 are arranged side by side, the central row has one shorter conductor 3 (hereinafter also referred to as the "central one-end side short conductor 3C") at one end side in the longitudinal direction 2L of the plug-in mounting portion 2, and one even shorter conductor 3 (hereinafter also referred to as the "central other-end side short conductor 3D") at the other end side in the longitudinal direction 2L of the plug-in mounting portion 2.

[0025] The specific configuration of the conductor 3 is not particularly limited, but for example, the thickness of the conductor 3 (thickness as a substantially plate-shaped member) may be 2 mm or more and 30 mm or less, and the width of the conductor 3 (width as a substantially plate-shaped member, which can also be said to be the length in the installation direction of the plug-in device P) may be 10 mm or more and 300 mm or less. The thickness and width of these conductors 3 may be substantially the same for all conductors 3A to 3D, or conversely, may be different from each other. Furthermore, in the three rows in which multiple conductors 3 are arranged side by side, the distance between the two outer rows and the central row (the spacing between each conductor 3) is not particularly limited, but may be, for example, 180 mm or 200 mm, or between 50 mm and 500 mm. The length 3n of the conductor 3 differs depending on whether it is the outer long conductors 3A and 3B or the central short conductors 3C and 3D, and will be described later for each of the conductors 3A to 3D.

[0026] <Outer long conductor 3A, 3B> As shown in Figures 1 to 6, the outer long conductors 3A, 3B are each a single conductor 3 arranged in two outer rows, extending from one end to the other end in the longitudinal direction 2L of the plug-in mounting portion 2; for example, when viewed from the front, the left outer long conductor is referred to as the left outer long conductor 3A, and the right outer long conductor is referred to as the right outer long conductor 3B. Here, in the present invention, "one conductor 3 extending from one end to the other end in the longitudinal direction 2L of the plug-in mounting portion 2" refers not only to a conductor extending from the very end to the very other end in the longitudinal direction 2L of the plug-in mounting portion 2 (i.e., a conductor 3 having a length 3n of conductor 3 equal to the length 2n of the plug-in mounting portion 2), but also to a conductor extending from the vicinity of one end to the very other end in the longitudinal direction 2L of the plug-in mounting portion 2 (i.e., a conductor 3 having a length 3n of conductor 3 slightly shorter at one end than the length 2n of the plug-in mounting portion 2), or This includes those that extend from the very end to the vicinity of the other end in the longitudinal direction 2L of the plug-in mounting portion 2 (i.e., those in which the length 3n of the conductor 3 is slightly shorter at the other end than the length 2n of the plug-in mounting portion 2), and those that extend from the vicinity of one end to the vicinity of the other end in the longitudinal direction 2L of the plug-in mounting portion 2 (i.e., those in which the length 3n of the conductor 3 is slightly shorter at both the one end and the other end than the length 2n of the plug-in mounting portion 2).In this case, the very end and the vicinity of that end are referred to as one end, and the very other end and the vicinity of the other end are referred to as the other end. Therefore, the relationship between the lengths 3An, 3Bn of the left and right outer long conductors 3A, 3B (lengths along the longitudinal direction 3L) and the length 2n of the plug-in mounting portion 2 is such that the length 3An of the left outer long conductor 3A is approximately equal to the length 2n of the plug-in mounting portion 2 (3An ≒ 2n) or shorter than the length 2n of the plug-in mounting portion 2 (3An < 2n), and the length 3Bn of the right outer long conductor 3B is approximately equal to the length 2n of the plug-in mounting portion 2 (3Bn ≒ 2n) or shorter than the length 2n of the plug-in mounting portion 2 (3Bn < 2n).

[0027] <Central one end short conductor 3C, central other end short conductor 3D> As shown in FIGS. 1 to 6, the central one-end side short conductor 3C is a single conductor 3 provided in a single row in the center and extending from one end to the middle of the plug-in mounting portion 2 in the longitudinal direction 2L. Here, in the present invention, the "midway portion" in the longitudinal direction 2L of the plug-in mounting portion 2 refers not only to the exact center between the one end and the other end in the longitudinal direction 2L of the plug-in mounting portion 2, but also to a portion near the center that is slightly closer to either the one end side or the other end side from the exact center, or a portion nearer a predetermined distance to either the one end side or the other end side from the exact center, and in the case of a portion nearer a predetermined distance, the ratio of the distance from one end to the midway portion to the distance from the midway portion to the other end may be, for example, 1:2, 2:1, 1:3, 3:1, etc., or may be 2:3, 3:2, 3:4, 4:3, 4:5, 5:4, etc. Note that the ratio of the distance from one end to the midway portion to the distance from the midway portion to the other end may be 1:1, etc., when the midway portion is near the center. Furthermore, in the present invention, "one conductor 3 extending from one end to the middle in the longitudinal direction 2L of the plug-in mounting portion 2" includes not only one extending from the very end to the middle in the longitudinal direction 2L of the plug-in mounting portion 2, but also one extending from near one end to the middle in the longitudinal direction 2L of the plug-in mounting portion 2. As shown in FIGS. 1 to 6, the central other end side short conductor 3D is one conductor 3 extending from the middle to the other end of the plug-in mounting portion 2 in the longitudinal direction 2L. Here, in the present invention, "one conductor 3 extending from the midpoint in the longitudinal direction 2L of the plug-in mounting portion 2 to the other end" includes not only one extending from the midpoint in the longitudinal direction 2L of the plug-in mounting portion 2 to the very other end, but also one extending from the midpoint in the longitudinal direction 2L of the plug-in mounting portion 2 from near the other end to the midpoint. Therefore, a predetermined central conductor gap 3s exists (is provided) between the central one end side short conductor 3C and the central other end side short conductor 3D described above.

[0028] <Central conductor gap 3s and the installation position of plug-in device P, etc.> As shown in FIGS. 1 to 3, the central conductor gap 3s is located midway in the longitudinal direction 2L of the plug-in mounting portion 2 in the same row as the central one end side short conductor 3C and the central other end side short conductor 3D. It can be said that it is precisely because this central conductor gap 3s exists (in other words, the central conductor 3 is divided in the middle) that the type of AC current and voltage values ​​output to the plug-in device P attached to the plug-in mounting portion 2 on the central one-end short conductor 3C side can be changed from the type of AC current and voltage values ​​output to the plug-in device P attached to the plug-in mounting portion 2 on the central other-end short conductor 3D side. In other words, the plug-in electric circuit 1 according to the present invention can change the type of AC current and voltage value output to the plug-in device P simply by changing the installation position of the plug-in device P, and one plug-in electric circuit 1 can accommodate multiple types of AC current and voltage values. Here, referring to the relationship between the central conductor gap 3s and the lengths 3Cn, 3Dn of the central short conductors 3C, 3D (lengths along the longitudinal direction 3L) and the lengths 3An, 3Bn of the left and right outer long conductors 3A, 3B, the sum of the central conductor gap 3s and the lengths 3Cn, 3Dn of the central short conductors 3C, 3D is approximately equal to the lengths 3An, 3Bn of either the left or right outer long conductors 3A, 3B (3s + 3Cn + 3Dn ≈ 3An (= 3Bn)). At least one of the lengths 3Cn and 3Dn is shorter than half (1 / 2) of the lengths 3An and 3Bn of the left and right outer long conductors 3A and 3B (3Cn ≒ 1 / 2 × 3An (= 1 / 2 × 3Bn), or / and 3Dn ≒ 1 / 2 × 3An (= 1 / 2 × 3Bn)), and further, the relationship between the length 3Cn of the central one end side short conductor 3C and the length 3Dn of the central other end side short conductor 3D is either approximately equal or one is longer (3Cn ≒ 3Dn, 3Cn > 3Dn, or 3Cn < 3Dn). There are no particular limitations on the arrangement of the conductors 3A to 3D as described above when viewed from the front. For example, the positions of one end of the left and right outer long conductors 3A and 3B and the position of one end of the central short conductor 3C may be aligned approximately along a direction approximately perpendicular to the longitudinal direction 2L of the plug-in mounting portion 2, and the positions of the other ends of the left and right outer long conductors 3A and 3B and the position of the other end of the central short conductor 3D may be aligned approximately along a direction approximately perpendicular to the longitudinal direction 2L of the plug-in mounting portion 2 (see Figures 1 and 2). Alternatively, the positions of one end of each conductor 3A, 3B, 3C and the positions of the other end of each conductor 3A, 3B, 3D may be oblique to the direction approximately perpendicular to the longitudinal direction 2L of the plug-in mounting portion 2 (see Figure 3). The position of the central conductor gap 3s when viewed from the front can be said to be approximately equal to (approximately overlapping with) the position of the device gap Ps when the plug-in device P is attached to the plug-in electrical circuit 1 (plug-in attachment portion 2) when viewed from the front (see Figure 6, etc.).

[0029] <Transformer 4> 1 to 5, the transformer 4 is a device that outputs AC current to the plug-in circuit 1 described above, and is a device that transforms AC current from the system K or the like into AC current with a voltage suitable for the load 10a or the like described below, and is a so-called transformer. Note that "transformer" is an abbreviation for "transformer." Furthermore, the power distribution system 10 described below may include the transformer 4. The specific configuration of transformer 4 is not particularly limited, but may be, for example, a two-winding transformer (see FIG. 2), a three-winding transformer (see FIGS. 1, 3 to 5), or a transformer with four or more windings. The connection type of each winding of transformer 4 is not particularly limited, and may be, for example, a delta connection (Δ connection), a V connection (V connection), a star connection (Y connection), or the like. At least one of the two or more windings of transformer 4, particularly the low-voltage side winding (secondary winding, tertiary winding, etc.), may be a Δ connection or a V connection. The low-voltage side winding has a predetermined number (four, three, etc.) of low-voltage side terminals 4L, and the voltage value thereof may be 105V, 210V, 100V, 200V, 420V, 400V, etc. On the other hand, the high-voltage side winding (primary winding) of transformer 4 has a predetermined number (three, etc.) of high-voltage side terminals 4H, and the voltage value thereof may be 6600V, 22000V, etc. In addition, the transformer 4 may be provided with a ground 4a from the O terminal (O phase) or a contact prevention plate, and may be an oil-immersed transformer (self-cooled, air-cooled, water-cooled, etc.) or a dry-type transformer (self-cooled, air-cooled, water-cooled, etc.).

[0030] Referring to the connection between the transformer 4 and the plug-in circuit 1 as shown in FIGS. 1 and 2, the delta-connected or V-connected winding has a U-terminal, a V-terminal, and a W-terminal as well as an O-terminal located midway between the U-terminal and the W-terminal. One of the left and right outer long conductors 3A and 3B is connected to the U-terminal, the other of the left and right outer long conductors 3A and 3B is connected to the W-terminal, one of the central short conductor 3C and the central short conductor 3D is connected to the V-terminal, and the other of the central short conductor 3C and the central short conductor 3D is connected to the O-terminal. In addition, in a single transformer 4 (especially a transformer 4 with three or more windings), if two or more windings are delta-connected or V-connected, two or more plug-in circuits 1 may be connected to one transformer 4.

[0031] <Disc Cabinet 5> As shown in FIGS. 1 to 5, the panel housing 5 is a housing for a panel in which the plug-in electrical circuit 1 described above is provided. The panel housing 5 has a longitudinal direction 5L, and the plug-in circuit 1 is arranged inside the panel housing 5 so that this longitudinal direction 5L and the longitudinal direction 2L of the plug-in mounting portion 2 of the plug-in circuit 1 are approximately parallel. Here, in the present invention, the longitudinal direction 5L and the longitudinal direction 2L, etc. being "approximately parallel" does not only mean that the longitudinal direction 5L and the longitudinal direction 2L, etc. are strictly parallel, but also means that they are deviated (slanted) from strictly parallel by less than 1 degree, or by 1 degree, 2 degrees, or several degrees. Furthermore, with regard to the relationship between the panel housing 5 and the above-mentioned transformer 4, the transformer 4 may be attached from the outside of the panel housing 5 (see Figures 3 to 5), or the transformer 4 may be provided inside the panel housing 5 (see Figures 1 and 2), in which case it can be said that the power distribution system 10 has a distribution panel. Furthermore, the power distribution system 10 described later may have the panel housing 5.

[0032] The specific configuration of the panel housing 5 is not particularly limited, but may include, for example, a high-voltage panel housing 5A and a low-voltage panel housing 5B, and may also include other equipment housings such as control boxes and cubicles that incorporate control devices and communication devices. There are no particular limitations on the specific configuration of the high-voltage panel housing 5A or the low-voltage panel housing 5B, but for example, each may be formed in an approximately rectangular parallelepiped or cubic shape as a whole, and may also be called a cubicle. The high-voltage panel housing 5A is a panel housing in which a high-voltage side circuit breaker 5a connected to an electric circuit between the system K and the transformer 4 is provided. On the other hand, the low-voltage panel housing 5B is a panel housing in which the above-mentioned plug-in circuit 1 is provided inside and in which a low-voltage side circuit breaker 5b, which is a plug-in device P (particularly, a plug-in breaker) or the like that is attached to this plug-in circuit 1, is provided inside, and the above-mentioned "the longitudinal direction 5L of the panel housing 5 and the longitudinal direction 2L of the plug-in mounting portion 2 of the plug-in circuit 1 are approximately parallel" can also be said to be "the longitudinal direction 5LB of the low-voltage panel housing 5B and the longitudinal direction 2L of the plug-in mounting portion 2 of the plug-in circuit 1 are approximately parallel." Here, this low-voltage side circuit breaker 5b is a circuit breaker that is provided between the power distribution system 10 described below and each of the loads 10a (charger 10a1, lighting load 10a2, power load 10a3), the storage device 10b, and the power generation device 10c. In more detail, a charging load circuit breaker 5b1 that is connected to the circuit between the transformer 4 and the charger 10a1 and is capable of interrupting the circuit, a lighting load circuit breaker 5b2 that is connected to the circuit between the transformer 4 and the lighting load 10a2 and is capable of interrupting the circuit, a power load circuit breaker 5b3 that is connected to the circuit between the transformer 4 and the power load 10a3 and is capable of interrupting the circuit, a storage circuit breaker 5bb that is connected to the circuit between the transformer 4 and the storage device 10b and is capable of interrupting the circuit, and a power generation circuit breaker 5bc that is connected to the circuit between the transformer 4 and the power generation device 10c and is capable of interrupting the circuit (see Figures 1 to 6). It is not necessary for all low-voltage side circuit breakers 5b to be plug-in circuit breakers P, but at least charging load circuit breaker 5b1, lighting load circuit breaker 5b2, and power load circuit breaker 5b3 may be plug-in circuit breakers P.

[0033] Additionally, inside the panel housing 5, there are installed a high voltage AC load break switch (LBS) with a current limiting fuse, a zero-phase voltage detector (ZPD), a power fuse (PF), a voltage transformer (VT), a circuit protector (CP), a synchronism detector, a current transformer (CT), a digital multimeter (with a reverse power relay (RPR) or an over voltage ground relay (OVGR) function), an autotransformer, an uninterruptible power supply (UPS), a current transformer (such as a clamp type current transformer), fuses (F), a voltmeter, a voltage change over switch (VS), an ammeter, an ammeter change over switch (AS), and so on. A power switch, a power meter, a control device, a communication device, etc. may also be provided. The panel housing 5 may also have an intake port for drawing air from the outside to the inside, and an exhaust port for discharging air from the inside to the outside.

[0034] <Power Distribution System 10> As shown in Figures 1 to 6, the power distribution system 10 has at least the plug-in circuit 1 described above, and may also have the transformer 4 described above and the panel housing 5 described above, and may also have a load 10a described below, a storage device 10b described below, and a power generation device 10c described below. The power distribution system 10 may receive power in addition to distributing power, and there is no particular limitation on which of the load 10a, the power storage device 10b, and the power generation device 10c the system has, depending on the application. In one power distribution system 10, the number of transformers 4 and panel housings 5 ​​may be one (see Figures 1 and 2) or multiple (not shown), but the number of transformers 4 and panel housings 5 ​​may be the same. The load 10a, the power storage device 10b, and the power generation device 10c in the power distribution system 10 will be described below.

[0035] <Load 10a> As shown in Figures 1 and 2, the load 10a is a load (load equipment) that consumes power received from the system K via a transformer 4, and consumes stored power from the power storage device 10b (described later) and power generated by the power generation device 10c. The load 10a may be, for example, an automobile dealership or a gas station, a rental car store (rental car shop), a charger 10a1 (described below) in a factory or workshop, or may include electrical equipment and facilities that use power such as electric and electronic devices (general lighting loads 10a2 such as incandescent lamps, fluorescent lamps, and mercury lamps (lighting fixtures), and general power loads 10a3 such as air conditioners, motors, and pumps), or may even include the factory or workshop itself. Furthermore, load 10a may include devices that use electricity, such as electrical and electronic devices in offices of corporations and organizations such as companies, individuals, government offices and associations, homes, stores, warehouses, garages, parking lots, bicycle parking lots, school buildings, auditoriums, gymnasiums, research facilities, hospitals, clinics, inns and hotels, theaters, movie theaters, stadiums, baseball stadiums, etc., or the offices of companies and the like, or may include a combination of these. In the following, the charger 10a1 will be particularly described in detail. Charger 10a1 may be configured as any of a rapid charger, a normal charger, an ultra-rapid charger, etc. Here, "charger 10a1" in the present invention refers to a stationary charging device or charging facility used to charge vehicles equipped with a battery (storage battery), such as electric vehicles (EVs), plug-in hybrid vehicles, and electric motorcycles, and is also referred to as a charging stand, charging station, charging spot, etc. Note that charger 10a1 may also be a charging device or charging facility used to charge communication devices equipped with a battery (storage battery), such as smartphones and mobile phones, portable PCs (personal computers), electrical appliances, etc., in addition to vehicles.

[0036] <Power storage device 10b> As shown in FIG. 2, the power storage device 10b is a device that stores power received from the system K via the transformer 4, power generated by the power generation device 10c (described later), and the like. The power storage device 10b may be, for example, a storage battery such as a lead storage battery, a lithium ion storage battery, a nickel-metal hydride storage battery, or a nickel-cadmium storage battery; it may store hydrogen generated by electrolysis of water using the power generated by the power generation device 10c, and extract electricity when needed using a fuel cell or the like; or it may be a device that stores electricity as kinetic energy using a flywheel or the like, stores electricity as potential energy using pumped water, or stores electricity directly as electrical energy using a capacitor or the like.

[0037] <Power generation device 10c> As shown in FIG. 2, the power generation device 10c may have any configuration as long as it generates electricity, and may be, for example, a device that generates electricity using solar power, wind power, hydroelectric power, geothermal power, solar thermal power, atmospheric heat or other heat present in nature, or biomass (organic matter derived from plants and animals that can be used as an energy source). Alternatively, the power generating device 10c may generate power using ocean temperature difference, wave power, tidal currents (ocean currents), or tides. The power generated by the power generation device 10c may be consumed by the load 10a, stored in the power storage device 10b, or sold to the power grid K via the transformer 4.

[0038] <Other> The present invention is not limited to the above-described embodiment, and the individual components or overall structure, shape, dimensions, etc. of the plug-in power circuit 1 and the power distribution system 10 may be modified as appropriate in accordance with the spirit of the present invention. In addition to being connected to the delta-connected or V-connected windings of the transformer 4 described above, one plug-in electric circuit 1 may be connected to three single-phase transformers. Alternatively, for example, one plug-in electric circuit 1 may be connected to a general electric circuit such as a cable or bus duct through which one type of AC current (such as three-phase three-wire) flows and another general electric circuit such as a cable or bus duct through which another type of AC current (such as single-phase three-wire) flows, provided that the phases of the two general electric circuits are approximately the same and the voltage values ​​of the AC currents connected to the left and right outer long conductors 3A, 3B are approximately the same. When the plug-in electric circuit 1 is disposed inside the panel housing 5, the longitudinal direction 5L of the panel housing 5 and the longitudinal direction 2L of the plug-in mounting portion 2 of the plug-in electric circuit 1 do not have to be substantially parallel. Furthermore, the panel housing 5 does not have to be divided into the high-voltage panel housing 5A and the low-voltage panel housing 5B described above, and may be a single panel housing. The power distribution system 10 may not have the transformer 4 or the panel housing 5 . The system K related to the plug-in circuit 1 described above will be explained in detail below.

[0039] <System K> As shown in Figures 1 and 2, system K transmits (receives) power to plug-in circuit 1 and transformer 4, and refers to the entire system through which electric power companies and others supply electricity to consumers, and can also be called power system K. Specifically, system K includes facilities such as substations, transmission lines, and distribution lines, and may also include power plants. System K may also include a utility transformer, a power purchase watt-hour meter, a power sale watt-hour meter, a pole-mounted air switch, a protective relay, and the like, which are located outside a predetermined panel housing 5 in which plug-in circuit 1 is installed. The power handled by such system K may be either AC or DC, but the following description will be given assuming that it is AC. In System K, most of the electricity transmitted is AC, so it is transmitted using three-phase, three-wire (3φ3W) transmission lines. In order to reduce transmission losses during this process, the main long-distance transmission sections transmit electricity at as high a voltage as possible (for example, 6600V or 22000V). The electricity transmitted by system K is transformed (stepped down) in several stages near the point of consumption, and after the pole-mounted transformer, it is distributed via single-phase two-wire (1φ2W) or similar. System K may be a system (commercial power system) of an electric power company or the like, or may be a system independently owned by an organization such as a company or a local government, or a system within a plant (independent power system). [Industrial Applicability]

[0040] The plug-in circuit and power distribution system of the present invention can accommodate multiple types of AC current and voltage values, regardless of the power contract from the grid (high voltage contract, low voltage contract, extra high voltage contract, etc.) or the type of power supply, and can be used both indoors and outdoors. [Explanation of symbols]

[0041] 1 Plug-in circuit 2 Plug-in mounting part 2L Longitudinal direction of plug-in mounting part 3 Conductors 4. Transformers 5-panel cabinet 5L Longitudinal direction of panel case 10 Power Distribution System P Plug-in Device

Claims

1. A plug-in circuit having a plug-in attachment portion (2) to which a plug-in device (P) can be attached, The plug-in mounting portion (2) has a longitudinal direction (2L), and a plurality of substantially plate-shaped conductors (3) are arranged in three rows substantially along the longitudinal direction (2L), In each of the two outer rows of the three rows, one conductor (3) is provided extending from one end to the other end in the longitudinal direction (2L) of the plug-in mounting portion (2); The plug-in circuit is characterized in that the central row of the three rows is provided with one conductor (3) extending from one end to a midpoint in the longitudinal direction (2L) of the plug-in mounting portion (2), and one conductor (3) extending from the midpoint to the other end in the longitudinal direction (2L) of the plug-in mounting portion (2).

2. A power distribution system comprising the plug-in electric circuit (1) according to claim 1 and a transformer (4) that outputs an AC current to the plug-in electric circuit (1), The transformer (4) has two or more windings, At least one of the two or more windings of the transformer (4) is a delta connection or a V connection, The Δ-connected or V-connected winding includes a U-terminal, a V-terminal, and a W-terminal, and an O-terminal located between the U-terminal and the W-terminal, One of the conductors (3) provided in each of the two outer rows is connected to the U terminal, The other of the conductors (3) provided in each of the two outer rows is connected to the W terminal, One of the two conductors (3) arranged in the central row is connected to the V terminal, A power distribution system characterized in that the other of the two conductors (3) arranged in the central row is connected to the O terminal.

3. The device also includes a panel housing (5) in which the plug-in circuit (1) is provided, The panel housing (5) has a longitudinal direction (5L), The power distribution system according to claim 2, characterized in that the plug-in circuit (1) is arranged inside the panel housing (5) so that the longitudinal direction (5L) of the panel housing (5) and the longitudinal direction (2L) of the plug-in mounting portion (2) of the plug-in circuit (1) are approximately parallel to each other.

4. A power distribution system including the plug-in electric circuit (1) according to claim 1 and a panel housing (5) in which the plug-in electric circuit (1) is provided, The panel housing (5) has a longitudinal direction (5L), A power distribution system characterized in that a plug-in circuit (1) is arranged inside the panel housing (5) so that a longitudinal direction (5L) of the panel housing (5) and a longitudinal direction (2L) of a plug-in mounting portion (2) of the plug-in circuit (1) are approximately parallel.

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