Distribution board

Abstract

To provide a distribution board in which a configuration related to electrical connection of a switch can be simplified.SOLUTION: A distribution board 100 includes a switch 2, a main breaker 1, a conductive bar 3, a branch breaker 4, and a connection mechanism 6. The switch 2 has an input terminal 21 and an output terminal 22, and switches electrical continuity / interruption between the input terminal 21 and the output terminal 22. Commercial power is supplied to a primary side of the main breaker 1, and the input terminal 21 is directly or indirectly connected to a secondary side. The conductive bar 3 is connected to the output terminal 22. The branch breaker 4 switches electrical continuity / interruption between the conductive bar 3 and an electric device Ka. The connection mechanism 6 connects the output terminal 22 and the conductive bar 3 directly.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a distribution board. [Background technology]

[0002] Patent Document 1 discloses an automatic power supply switching device that switches the power supply of a load from the commercial power supply to a distributed power supply when a power outage of the commercial power supply is detected. In Patent Document 1, the distributed power supplies include a fuel cell, a storage battery, and a solar power generation device.

[0003] The automatic power supply switching device includes a magnet coil and a control unit. The outputs of the commercial power supply, fuel cell, storage battery, and solar power generation system are connected to the load via four magnet coils equipped with switching contacts that turn the power supply to the load on and off. When the commercial power supply fails, the control unit selects a distributed power source that is capable of supplying power to the load from among the fuel cell, storage battery, and solar power generation system. The control unit then controls the magnet coil to connect the selected distributed power source to the load, thereby continuing the power supply. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2022-17058 Summary of the Invention [Problem to be solved by the invention]

[0005] In an automatic power supply switching device (distribution board) such as that in Patent Document 1 mentioned above, there is a demand for simplifying the configuration relating to the electrical connections of the switch that switches the system.

[0006] An object of the present disclosure is to provide a distribution board that can simplify the configuration related to the electrical connection of switches. [Means for solving the problem]

[0007] A distribution board according to one aspect of the present disclosure includes a switch, a main breaker, a conductive bar, branch breakers, and a connection mechanism. The switch has an input terminal and an output terminal, and establishes electrical continuity between the input terminal and the output terminal. The main breaker receives commercial power on its primary side, and the input terminal is connected directly or indirectly to its secondary side. The conductive bar is connected to the output terminal. The branch breaker establishes electrical continuity between the conductive bar and an electrical device. The connection mechanism directly connects the output terminal and the conductive bar. [Effects of the Invention]

[0008] The distribution board of the present disclosure has the advantage of being able to simplify the configuration related to the electrical connection of the switches. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram illustrating a configuration of a distribution board according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a front view showing a main part of the distribution board. [Figure 3] FIG. 3 is a circuit diagram showing the configuration of a switch provided in the distribution board. [Figure 4] FIG. 4 is a front view showing a connection mechanism provided in the distribution board. [Figure 5] FIG. 5 is an exploded view showing a connection mechanism provided in the distribution board. [Figure 6] FIG. 6 is a diagram showing the configuration of a distribution board according to a first modified example of the present disclosure. [Figure 7] FIG. 7 is a diagram showing the configuration of a distribution board according to a second modification of the present disclosure. [Figure 8] FIG. 8 is a circuit diagram showing the configuration of a switch provided in the distribution board. [Figure 9] FIG. 9 is a diagram illustrating a configuration of a distribution board according to a third modified example of the present disclosure. [Figure 10] FIG. 10 is a front view showing a connection mechanism provided in the distribution board. [Figure 11]FIG. 11 is an exploded view showing a connection mechanism provided in the distribution board. [Figure 12] FIG. 12 is a plan view showing a connection mechanism included in a distribution board according to a fourth modification of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0010] The following embodiments generally relate to a distribution board, and more particularly to a distribution board including a switch.

[0011] It should be noted that the following embodiment is merely an example of an embodiment of the present disclosure. The present disclosure is not limited to the following embodiment, and various modifications are possible depending on the design, etc., as long as the effects of the present disclosure can be achieved. Furthermore, each drawing described in the following embodiment is a schematic drawing, and the ratios of the sizes and thicknesses of the components in the drawing do not necessarily reflect the actual dimensional ratios.

[0012] Hereinafter, an embodiment will be described with reference to the drawings.

[0013] (Embodiment) (1) Overview of the distribution board Distributed power sources are increasingly being installed in homes, factories, stores, office buildings, commercial buildings, hospitals, schools, and more. One function provided by distributed power sources is the supply of power when the commercial power grid experiences a power outage. To switch from the commercial power grid to a distributed power source during a power outage, adding a system switching panel separate from the distribution panel is considered. However, adding a switching panel requires additional space in addition to the space for the distribution panel, making it difficult to secure the installation space. Furthermore, adding a new switching panel to an existing system requires rewiring, etc. This places a burden on both the contractor and the client, hindering the smooth introduction of distributed power sources. Therefore, it is considered to incorporate the switching panel function into the distribution panel from the beginning.

[0014] The distribution board 100 shown in FIG. 1 includes a switch 2, a main breaker 1, a conductive bar 3, branch breakers 4, and a connection mechanism 6.

[0015] The switch 2 has a first input terminal (input terminal) 21 and an output terminal 22, and establishes or breaks electrical continuity between the first input terminal 21 and the output terminal 22. Commercial power is supplied to the primary side of the main breaker 1, and the first input terminal 21 is connected directly or indirectly to the secondary side. The conductive bar 3 is connected to the output terminal 22. The branch breaker 4 establishes or breaks electrical continuity between the conductive bar 3 and the electrical device Ka. The connection mechanism 6 directly connects the output terminal 22 and the conductive bar 3.

[0016] The distribution board 100 includes the connection mechanism 6 and directly connects the output terminal 22 and the conductive bar 3, thereby simplifying the configuration for the electrical connection between the switch 2 and the conductive bar 3 compared to a configuration in which the output terminal 22 and the conductive bar 3 are indirectly connected via an electric wire. In other words, the distribution board 100 can simplify the configuration for the electrical connection of the switch 2.

[0017] The term "direct connection" refers to a state in which two components are connected in direct contact with each other without any other components interposed between the two components.

[0018] (2) Details In the following description, unless otherwise specified, the left-right direction and the up-down direction are defined as being orthogonal to each other in Figures 1 and 2. Furthermore, the direction orthogonal to the left-right direction and the up-down direction is defined as the front-rear direction. However, these directions are merely examples and are not intended to limit the direction in which the distribution board 100 is used. Furthermore, the arrows indicating the various directions in the drawings are merely shown for the purpose of explanation and have no substance.

[0019] The distribution board 100 is a residential distribution board (so-called residential board) used in a single-phase three-wire power distribution system. However, the distribution board 100 is not limited to a residential board, and may be a cabinet-type distribution board used in a three-phase three-wire or three-phase four-wire power distribution system.

[0020] The distribution board 100 includes a cabinet C1 that houses internal devices. The cabinet C1 is a rectangular box with an open front, and is attached to a building material such as a wall. Covers that can be freely opened, closed, or detached from the opening in the front of the cabinet C1 are not shown in Figures 1 and 2.

[0021] The distribution board 100 includes, as internal equipment housed in a cabinet C1, a main breaker (main switch) 1, a switch 2, three conductive bars 3, a plurality of branch breakers 4, and an interconnection breaker 5. These internal devices are attached to the cabinet C1 directly or via attachment parts or the like.

[0022] (2.1) Main breaker The main breaker 1 is disposed inside the cabinet C1, slightly to the left of the center in the horizontal direction. Three primary side terminals 11 (see FIG. 2) corresponding to the primary side of the main breaker 1 are provided at the top end of the case of the main breaker 1, and three secondary side terminals 12 (see FIG. 2) corresponding to the secondary side of the main breaker 1 are provided at the right end of the case of the main breaker 1. Hereinafter, when distinguishing between the three primary side terminals 11, the three primary side terminals 11 may be referred to as primary side terminals 11a, 11b, and 11c, respectively. Furthermore, when distinguishing between the three secondary side terminals 12, the three secondary side terminals 12 may be referred to as secondary side terminals 12a, 12b, and 12c, respectively.

[0023] The main breaker 1 includes contacts in its case that electrically connect and disconnect the primary terminal 11 and the secondary terminal 12. The main breaker 1 includes an operating lever on the front of the case for turning the contacts on and off. The main breaker 1 has a function for detecting overcurrent abnormalities, such as short-circuit current or overload current, flowing through the contacts. Upon detecting an overcurrent abnormality, the main breaker 1 opens the contacts. In other words, upon detecting an overcurrent abnormality, the main breaker 1 cuts off the power supply to the secondary circuit of the main breaker 1. The main breaker 1 may also have a limiter function that opens the contacts when a current exceeding a predetermined limit flows. The main breaker 1 may also have a function for opening the contacts upon detecting a ground fault current, an open-phase neutral wire, or the like.

[0024] A single-phase three-wire electric wire W1 drawn in from a commercial power system CS is connected to the primary side terminal 11. A power supply line of a first voltage pole (L1 phase) of the electric wire W1 is connected to the primary side terminal 11a. A power supply line of a second voltage pole (L2 phase) of the electric wire W1 is connected to the primary side terminal 11b. A power supply line of a neutral pole (N phase) of the electric wire W1 is connected to the primary side terminal 11c. In other words, commercial power is supplied to the primary side terminal 11.

[0025] Electrical conduction and interruption is established between the primary side terminal 11a and the secondary side terminal 12a via the contacts of the main breaker 1. Electrical conduction and interruption is established between the primary side terminal 11b and the secondary side terminal 12b via the contacts of the main breaker 1. Electrical conduction and interruption is established between the primary side terminal 11c and the secondary side terminal 12c via the contacts of the main breaker 1. A first input terminal 21 of the switch 2 is directly connected to the secondary side terminal 12 via a connection mechanism 7 described below.

[0026] (2.2) Switch The changeover switch 2 is disposed inside the cabinet C1 to the right of the main breaker 1. Three first input terminals 21 (see FIG. 2) are provided at the left end of the case of the changeover switch 2, and three output terminals 22 (see FIG. 2) are provided at the right end of the case of the changeover switch 2. Three second input terminals 23 (see FIG. 2) are provided at the bottom end of the case of the changeover switch 2. The changeover switch 2 has a c-contact structure that electrically connects either the first input terminal 21 or the second input terminal 23 to the output terminal 22. Hereinafter, when distinguishing between the three first input terminals 21, the three first input terminals 21 may be referred to as first input terminals 21a, 21b, and 21c, respectively. Furthermore, when distinguishing between the three output terminals 22, the three output terminals 22 may be referred to as output terminals 22a, 22b, and 22c, respectively. Furthermore, when distinguishing between the three second input terminals 23, the three second input terminals 23 may be referred to as second input terminals 23a, 23b, and 23c, respectively.

[0027] A contact mechanism, the outline of which is shown in Fig. 3, is housed inside the case of the switch 2. The contact mechanism of the switch 2 includes three c-contacts 24. The c-contacts 24 include two fixed contacts 241 and 242 and one movable contact 243, and the movable contact 243 comes into contact with either the fixed contacts 241 or 242 depending on the energized state of the coil of the contact mechanism. Specifically, the movable contact 243 comes into contact with the fixed contact 241 when the coil is not energized, and comes into contact with the fixed contact 242 when the coil is energized. Hereinafter, when distinguishing between the three c-contacts 24, the three c-contacts 24 may be referred to as c-contacts 24a, 24b, and 24c, respectively.

[0028] At contact c 24a, fixed contact 241 is connected to first input terminal 21a, fixed contact 242 is connected to second input terminal 23a, and movable contact 243 is connected to output terminal 22a. At contact c 24b, fixed contact 241 is connected to first input terminal 21b, fixed contact 242 is connected to second input terminal 23b, and movable contact 243 is connected to output terminal 22b. At contact c 24c, fixed contact 241 is connected to first input terminal 21c, fixed contact 242 is connected to second input terminal 23c, and movable contact 243 is connected to output terminal 22c.

[0029] That is, when the movable contact 243 is in contact with the fixed contact 241, electrical continuity is established between the first input terminal 21 and the output terminal 22, and electrical disconnection is established between the second input terminal 23 and the output terminal 22. When the movable contact 243 is in contact with the fixed contact 242, electrical continuity is established between the second input terminal 23 and the output terminal 22, and electrical disconnection is established between the first input terminal 21 and the output terminal 22.

[0030] The secondary terminal 12 of the main breaker 1 is directly connected to the first input terminal 21 by a connection mechanism 7, which will be described later. The conductive bar 3 is directly connected to the output terminal 22 by a connection mechanism 6, which will be described later. The isolated output terminal T2 of the distributed power source DS is electrically connected to the second input terminal 23 via an electric wire W3. In other words, the switch 2 selectively supplies either commercial power (including grid-connected output, which will be described later) supplied from the commercial power system CS or isolated power, which is power output from the isolated output terminal T2 of the distributed power source DS, from the output terminal 22 to the conductive bar 3. The isolated power is supplied by a single-phase three-wire power distribution system.

[0031] The switch 2 switches three c-contacts 24 depending on whether or not there is a power outage in the commercial power system CS. In this embodiment, a voltage detection unit that detects the voltage (system voltage) of the commercial power system CS may be installed either inside or outside the cabinet C1. A power outage determination unit that determines whether or not there is a power outage in the commercial power system CS based on the detection result of the voltage detection unit may also be installed either inside or outside the cabinet C1. For example, the voltage detection unit may be provided in the main breaker 1 in the cabinet C1, or may be provided in the switch 2. The power outage determination unit may be provided in the switch 2 in the cabinet C1, or may be provided in a controller provided in a power system including the distribution board 100.

[0032] The switch 2 receives the determination result of the power failure determination unit via a wired signal or a wireless signal, and switches the c-contact 24 based on the determination result of the power failure determination unit.

[0033] Specifically, under normal conditions when the commercial power system CS is not experiencing a power outage, the switch 2 brings the movable contact 243 into contact with the fixed contact 241. That is, the switch 2 connects the first input terminal 21 to the output terminal 22, and disconnects the second input terminal 23 from the output terminal 22, thereby outputting the commercial power supplied from the commercial power system CS from the output terminal 22 to the conductive bar 3. The commercial power is supplied to the electric device Ka from the conductive bar 3 via the branch breaker 4 and the electric wire W4.

[0034] Furthermore, during a power outage in which the commercial power system CS is out, the switch 2 brings the movable contact 243 into contact with the fixed contact 242. That is, the switch 2 connects the second input terminal 23 to the output terminal 22, and disconnects the first input terminal 21 from the output terminal 22, thereby outputting the independent power supplied from the independent output terminal T2 of the distributed power source DS from the output terminal 22 to the conductive bar 3. The electric device Ka is supplied with the independent power from the conductive bar 3 via the branch breaker 4 and the electric wire W4.

[0035] (2.3) Conductive Bar The conductive bar 3 is formed into a long plate shape using a conductive material, and is arranged inside the cabinet C1 so as to extend in the left-right direction on the right side of the switch 2. The distribution board 100 has three conductive bars 3, and when distinguishing between the three conductive bars 3, the three conductive bars 3 may be referred to as conductive bars 3a, 3b, and 3c, respectively.

[0036] The conductive bars 3 are directly connected to the output terminals 22 of the switch 2 by a connection mechanism 6 described below. The left end of the conductive bar 3a is directly connected to the output terminal 22a, the left end of the conductive bar 3b is directly connected to the output terminal 22b, and the left end of the conductive bar 3c is directly connected to the output terminal 22c. In other words, the conductive bar 3a is the first voltage pole (L1 phase), the conductive bar 3b is the second voltage pole (L2 phase), and the conductive bar 3c is the neutral pole (N phase).

[0037] (2.4) Branch breaker The plurality of branch breakers 4 are arranged in the cabinet C1 in front of the conductive bar 3 on the upper and lower sides, with a plurality of each on each side lined up in the left-right direction.

[0038] The branch breaker 4 has a pair of primary terminals and a pair of secondary terminals. The branch breaker 4 has contacts in its case that electrically connect and disconnect the primary terminals and secondary terminals. The branch breaker 4 has an operating lever on the front of its case that turns the contacts on and off.

[0039] The branch breakers 4 are available for 100V and 200V. The pair of primary terminals of the 100V branch breaker 4 are connected to one of the conductive bars 3a of the first voltage pole and the conductive bar 3b of the second voltage pole, and to the neutral conductive bar 3c. The pair of primary terminals of the 200V branch breaker 4 are connected to the conductive bar 3a of the first voltage pole and the conductive bar 3b of the second voltage pole, respectively. Electrical equipment Ka is electrically connected to the pair of secondary terminals of the branch breaker 4 via electric wires W4. Examples of electrical equipment Ka include electrical appliances such as lighting fixtures and hot water supply equipment, as well as wiring devices such as outlets and wall switches.

[0040] The branch breaker 4 has a function to detect an overcurrent abnormality in which an overcurrent such as a short circuit current or an overload current flows through its contacts, and when an overcurrent abnormality is detected, the branch breaker 4 opens the contacts. In other words, when an overcurrent abnormality is detected, the branch breaker 4 cuts off the power supply to the electric device Ka.

[0041] As described above, the branch breaker 4 establishes or breaks electrical continuity between the conductive bar 3 and the electric device Ka.

[0042] (2.5) Grid-connected breaker The interconnection breaker 5 is disposed inside the cabinet C1 to the left of the main breaker 1. Three primary terminals 51 (see FIG. 2) are provided at the upper end of the case of the interconnection breaker 5, and three secondary terminals 52 (see FIG. 2) are provided at the lower end of the case of the interconnection breaker 5. Hereinafter, when distinguishing between the three primary terminals 51, the three primary terminals 51 may be referred to as primary terminals 51a, 51b, and 51c, respectively. Furthermore, when distinguishing between the three secondary terminals 52, the three secondary terminals 52 may be referred to as secondary terminals 52a, 52b, and 52c, respectively.

[0043] The interconnection breaker 5 has contacts in its case that electrically connect and disconnect the primary terminal 51 and the secondary terminal 52. The interconnection breaker 5 has an operating lever on the front of its case for turning the contacts on and off. The interconnection breaker 5 has a function for detecting overcurrent abnormalities in which an overcurrent such as a short-circuit current or an overload current flows through the contacts, and opens the contacts when an overcurrent abnormality is detected. The interconnection breaker 5 may also have a function for opening the contacts when it detects a leakage current, an open-phase neutral wire, or the like.

[0044] The primary side terminal 51 is electrically connected to a single-phase three-wire electric wire W1 of the commercial power system CS. The primary side terminal 51a is electrically connected to a power supply line of a first voltage pole (L1 phase) of the electric wire W1. The primary side terminal 51b is electrically connected to a power supply line of a second voltage pole (L2 phase) of the electric wire W1. The primary side terminal 51c is electrically connected to a power supply line of a neutral pole (N phase) of the electric wire W1.

[0045] The secondary-side terminal 52 is electrically connected to the grid-connection output terminal T1 of the distributed power source DS via the electric wire W2. That is, when the contacts of the grid-connection breaker 5 are on, the power output from the grid-connection output terminal T1 of the distributed power source DS is supplied to the electric wire W1 as a grid-connection output. The distributed power source DS controls the power output from the grid-connection output terminal T1 so that it is connected to the commercial power grid CS. Furthermore, when the contacts of the grid-connection breaker 5 are off, the distributed power source DS is disconnected from the commercial power grid CS.

[0046] (2.6) Distributed power generation The distributed power source DS includes a power generation device or a power storage device. Examples of the power generation device include solar power generation devices, wind power generation devices, hydroelectric power generation devices, biomass power generation devices, geothermal power generation devices, hydrogen-based power generation devices, and fossil fuel-based power generation devices. The power storage device is not limited to stationary devices, but also includes storage batteries installed in electric vehicles. The distributed power source DS converts the power generated by the power generation device or the power discharged from the power storage device into single-phase three-wire power and outputs it from the grid-connected output terminal T1 or the isolated output terminal T2. The distributed power source DS outputs power connected to the commercial power grid CS from the grid-connected output terminal T1. If the contacts of the grid-connected breaker 5 are on, the power output from the grid-connected output terminal T1 is supplied to the power line W1 as a grid-connected output. The distributed power source DS also outputs isolated power from the isolated output terminal T2. If the switch 2 establishes electrical continuity between the second input terminal 23 and the output terminal 22, the isolated power is supplied to the conductive bar 3.

[0047] The distributed power source DS detects, for example, the voltage at the grid-connected output terminal T1 as the voltage (grid voltage) of the commercial power grid CS. Based on the grid voltage, the distributed power source DS determines whether or not the commercial power grid CS has experienced a power outage. Based on the determination result, the distributed power source DS controls the output of the grid-connected output terminal T1 and the output of the isolated output terminal T2.

[0048] Specifically, during normal times when the commercial power grid CS is not experiencing a power outage, the distributed power source DS outputs grid-connected output from the grid-connected output terminal T1 and does not output independent power from the independent output terminal T2. During a power outage when the commercial power grid CS is experiencing a power outage, the distributed power source DS outputs independent power from the independent output terminal T2 and does not output grid-connected output from the grid-connected output terminal T1.

[0049] (2.7) Switching operation of the switch In normal times when the commercial power system CS is not experiencing a power outage, the switch 2 operates as follows.

[0050] Under normal circumstances, the switch 2 provides electrical continuity between the first input terminal 21 and the output terminal 22, and cuts off electrical continuity between the second input terminal 23 and the output terminal 22. Commercial power from the commercial power system CS is supplied to electrical equipment Ka via the main breaker 1, the switch 2, the conductive bar 3, the branch breaker 4, and the electric wire W4. The electrical equipment Ka operates on the commercial power. Furthermore, if the interconnection breaker 5 is on, the interconnection output output from the interconnection output terminal T1 of the distributed power source DS is supplied to the commercial power system CS via the interconnection breaker 5. The interconnection output is supplied to the load (including electrical equipment Ka) of the commercial power system CS.

[0051] During a power outage in which the commercial power system CS is powered down, the distribution board 100 operates as follows.

[0052] During a power outage, the switch 2 connects the second input terminal 23 and the output terminal 22, and cuts off the connection between the first input terminal 21 and the output terminal 22. The independent power output from the independent output terminal T2 of the distributed power source DS is supplied to the electrical device Ka via the switch 2, the conductive bar 3, the branch breaker 4, and the electric wire W4. The electrical device Ka operates on the independent power. In this case, to make efficient and effective use of the independent power, it is preferable to turn on only the branch breaker 4 to which the electrical device Ka required during a power outage is connected, and to keep the other branch breakers 4 off.

[0053] (2.8) Connection mechanism The connection mechanisms 6 and 7 will be described below with reference to FIGS.

[0054] (2.8.1) Connection between the output terminal of the switch and the conductive bar The output terminals 22 of the switch 2 and the conductive bars 3 are directly connected by a connection mechanism 6. The connection mechanism 6 includes three screws 61, screw holes 62 in the three output terminals 22, and insertion holes 63 in the three conductive bars 3, as shown in FIG.

[0055] Specifically, the output terminal 22 of the switch 2 is a rectangular metal plate made of a conductive metal such as copper or aluminum. The output terminal 22 protrudes from the right end of the case of the switch 2. Specifically, the output terminals 22a, 22b, and 22c are provided in this order from the top to the bottom of the right end of the case of the switch 2. A screw hole 62 is formed in each of the output terminals 22a, 22b, and 22c.

[0056] The conductive bars 3a, 3b, and 3c are arranged in the order 3a, 3c, and 3b from top to bottom. An insertion hole 63 with a circular cross section is formed in the left end of each of the conductive bars 3a, 3b, and 3c. The left end of the conductive bar 3a is arranged in front of the output terminal 22a, the left end of the conductive bar 3b is arranged in front of the output terminal 22b, and the left end of the conductive bar 3c is arranged in front of the output terminal 22c.

[0057] The first screw 61 is inserted through the insertion hole 63 of the conductive bar 3a from the front side of the conductive bar 3a and is fastened into the screw hole 62 of the output terminal 22a, thereby directly connecting the output terminal 22a and the conductive bar 3a. The second screw 61 is inserted through the insertion hole 63 of the conductive bar 3b from the front side of the conductive bar 3b and is fastened into the screw hole 62 of the output terminal 22b, thereby directly connecting the output terminal 22b and the conductive bar 3b. The third screw 61 is inserted through the insertion hole 63 of the conductive bar 3c from the front side of the conductive bar 3c and is fastened into the screw hole 62 of the output terminal 22c, thereby directly connecting the output terminal 22c and the conductive bar 3c.

[0058] As described above, the output terminal 22 of the switch 2 and the conductive bar 3 are directly connected by the connection mechanism 6. Therefore, the distribution board 100 can simplify the configuration for the electrical connection between the switch 2 and the conductive bar 3 compared to a configuration in which the output terminal 22 and the conductive bar 3 are indirectly connected via an electric wire. In other words, the distribution board 100 can simplify the configuration for the electrical connection of the switch 2.

[0059] (2.8.2) Connection of the input terminal of the switch to the main breaker The first input terminal 21 of the switch 2 and the secondary terminal 12 of the main breaker 1 are directly connected by a connection mechanism 7. The connection mechanism 7 includes three screws 71, screw holes 72 for each of the three first input terminals 21, and insertion holes 73 for each of the three secondary terminals 12, as shown in FIG.

[0060] Specifically, the first input terminal 21 of the switch 2 is a rectangular metal plate made of a conductive metal such as copper or aluminum. The first input terminal 21 protrudes from the left end of the case of the switch 2. The first input terminals 21a, 21b, and 21c are provided in this order from the top to the bottom of the left end of the case of the switch 2. A screw hole 72 is formed in each of the first input terminals 21a, 21b, and 21c.

[0061] The secondary terminals 12a, 12b, and 12c of the main breaker 1 are rectangular metal plates made of a conductive metal such as copper or aluminum. The secondary terminals 12a, 12b, and 12c protrude from the right end of the case of the main breaker 1. The secondary terminals 12a, 12b, and 12c are arranged in this order from the top to the bottom of the right end of the case of the main breaker 1. Each of the secondary terminals 12a, 12b, and 12c has a circular cross-sectional insertion hole 73 formed therein. The secondary terminal 12a is located in front of the first input terminal 21a, the secondary terminal 12b is located in front of the first input terminal 21b, and the secondary terminal 12c is located in front of the first input terminal 21c.

[0062] The first screw 71 is inserted through the insertion hole 73 of the secondary terminal 12a from the front side of the secondary terminal 12a and is fastened into the screw hole 72 of the first input terminal 21a, thereby directly connecting the first input terminal 21a and the secondary terminal 12a. The second screw 71 is inserted through the insertion hole 73 of the secondary terminal 12b from the front side of the secondary terminal 12b and is fastened into the screw hole 72 of the first input terminal 21b, thereby directly connecting the first input terminal 21b and the secondary terminal 12b. The third screw 71 is inserted through the insertion hole 73 of the secondary terminal 12c from the front side of the secondary terminal 12c and is fastened into the screw hole 72 of the first input terminal 21c, thereby directly connecting the first input terminal 21c and the secondary terminal 12c.

[0063] As described above, the first input terminal 21 of the switch 2 and the secondary terminal 12 of the main breaker 1 are directly connected by the connection mechanism 7. Therefore, the distribution board 100 can simplify the configuration for the electrical connection between the switch 2 and the main breaker 1 compared to a configuration in which the first input terminal 21 and the secondary terminal 12 are indirectly connected via an electric wire. In other words, the distribution board 100 can simplify the configuration for the electrical connection of the switch 2.

[0064] (3) First Modification 6 shows a distribution board 100A of the first modified example. Note that the same components as those in the distribution board 100 are denoted by the same reference numerals and the description thereof will be omitted.

[0065] The distribution board 100A has a three-pole breaker 4A as one of the multiple branch breakers 4. The three-pole primary terminals of the breaker 4A are connected to the conductive bar 3a of the first voltage pole, the conductive bar 3b of the second voltage pole, and the conductive bar 3c of the neutral pole, respectively. The three-pole secondary terminals of the breaker 4A are electrically connected to the grid-connection output terminal T1 of the distributed power source DS via the electric wire W2A. Therefore, single-phase three-wire power output from the grid-connection output terminal T1 of the distributed power source DS is supplied as a grid-connection output to the conductive bar 3 via the electric wire W2A and the breaker 4A. In other words, the conductive bar 3 is supplied with power (grid-connection output) from the distributed power source DS. The grid-connection output supplied to the conductive bar 3 is supplied to a load (including electrical equipment Ka) of the commercial power system CS.

[0066] The distribution board 100A includes a switch 2A instead of the switch 2 of the distribution board 100. The switch 2A further includes a voltage detection unit 25, a power outage determination unit 26, and a first communication terminal 28. The voltage detection unit 25 detects the voltage (system voltage) of the commercial power system CS by measuring the voltage at the first input terminal 21. The power outage determination unit 26 determines whether or not the commercial power system CS has experienced a power outage based on the system voltage. The power outage determination unit 26 determines that the commercial power system CS has experienced a power outage when the system voltage drops below a predetermined threshold voltage. Then, the switch 2A switches the c-contact 24 in the same manner as the switch 2, based on the detection result of the power outage determination unit 26.

[0067] Furthermore, the voltage detection unit 25 notifies the distributed power source DS of the detection result of the grid voltage from the first communication terminal 28 via the communication line J1. The distributed power source DS further includes a second communication terminal T3 connected to the communication line J1, and receives the detection result of the grid voltage from the voltage detection unit 25 via the communication line J1 and the second communication terminal T3. Based on the detection result of the grid voltage, the distributed power source DS determines whether or not the commercial power grid CS is experiencing a power outage.

[0068] Alternatively, the power outage determination unit 26 may notify the dispersed power source DS of the determination result of a power outage in the commercial power system CS from the first communication terminal 28 via the communication line J1. The dispersed power source DS receives the power outage determination result from the power outage determination unit 26 via the communication line J1 and the second communication terminal T3. Based on the power outage determination result, the dispersed power source DS can recognize whether or not a power outage has occurred in the commercial power system CS.

[0069] When the commercial power grid CS is not experiencing a power outage, the distributed power source DS outputs a grid-connected output from the grid-connected output terminal T1 and does not output independent power from the independent output terminal T2. At this time, the distributed power source DS acquires information such as the voltage and phase of the grid voltage from the switch 2A via the communication line J1, and outputs a grid-connected output connected to the commercial power grid CS from the grid-connected output terminal T1. Under normal conditions when the commercial power grid CS is not experiencing a power outage, the switch 2A maintains electrical continuity between the first input terminal 21 and the output terminal 22, and the common power supplied to the conductive bar 3 is supplied to the load (including the electrical device Ka) of the commercial power grid CS.

[0070] If the commercial power grid CS experiences a power outage, the distributed power source DS stops outputting the grid-connected output from the grid-connected output terminal T1 and outputs isolated power from the isolated output terminal T2. During a power outage when the commercial power grid CS experiences a power outage, the switch 2A provides electrical continuity between the second input terminal 23 and the output terminal 22, and common power is supplied to the electrical device Ka.

[0071] By providing the above-described configuration, the distribution board 100A does not need to include the interconnection breaker 5 of the distribution board 100, and the interconnection breaker 5 can be omitted. Therefore, the distribution board 100A can reduce the number of internal devices compared to the distribution board 100, and the configuration can be simplified.

[0072] The voltage detection unit 25 may notify the dispersed power sources DS of the detection result of the system voltage by performing wireless communication with the dispersed power sources DS.

[0073] In addition, instead of the configuration in which the first communication terminal 28 of the switch 2A is used to notify the distributed power source DS of the detection result of the system voltage, a configuration in which an electric wire electrically connected to the first input terminal 21 is connected to the distributed power source DS, and the distributed power source DS detects the system voltage via the switch 2A may be used.

[0074] Alternatively, the distributed power source DS may be configured to directly detect the system voltage.

[0075] (4) Second Modification 7 shows a distribution board 100B of the second modified example. Note that the same components as those of the distribution boards 100 and 100A are denoted by the same reference numerals and the description thereof will be omitted.

[0076] The distribution board 100B includes a switch 2B instead of the switch 2 of the distribution board 100. The switch 2B is arranged inside the cabinet C1 to the right of the main breaker 1. Like the switch 2, three first input terminals 21 are provided at the left end of the case of the switch 2B, and three output terminals 22 are provided at the right end of the case of the switch 2B. The switch 2B has an a-contact structure that electrically connects and disconnects the first input terminal 21 and the output terminal 22.

[0077] The contact mechanism shown in Fig. 8 is housed inside the case of the switch 2B. The contact mechanism of the switch 2B has three a-contacts 27. The a-contacts 27 have one fixed contact 271 and one movable contact 272, and the movable contact 272 comes into contact with or separates from the fixed contact 271 depending on the current-carrying state of a coil of the contact mechanism. Specifically, the movable contact 272 comes into contact with the fixed contact 271 when the coil is energized, and separates from the fixed contact 271 when the coil is not energized. Hereinafter, when distinguishing between the three a-contacts 27, the three a-contacts 27 may be referred to as a-contacts 27a, 27b, and 27c, respectively.

[0078] In the a-contact 27a, the fixed contact 271 is connected to the first input terminal 21a, and the movable contact 272 is connected to the output terminal 22a. In the a-contact 27b, the fixed contact 271 is connected to the first input terminal 21b, and the movable contact 272 is connected to the output terminal 22b. In the a-contact 27c, the fixed contact 271 is connected to the first input terminal 21c, and the movable contact 272 is connected to the output terminal 22c.

[0079] That is, when the movable contact 272 is in contact with the fixed contact 271, electrical continuity is established between the first input terminal 21 and the output terminal 22. When the movable contact 272 is separated from the fixed contact 271, electrical continuity is established between the first input terminal 21 and the output terminal 22.

[0080] The secondary terminal 12 of the main breaker 1 is directly connected to the first input terminal 21 by the above-mentioned connection mechanism 7. The conductive bar 3 is directly connected to the output terminal 22 by the above-mentioned connection mechanism 6. In other words, the switch 2 supplies or cuts off commercial power (including grid-connected output) supplied from the commercial power system CS from the output terminal 22 to the conductive bar 3.

[0081] The switch 2B switches three a-contacts 27 depending on whether or not there is a power outage in the commercial power system CS. Therefore, like the switch 2A, the switch 2B further includes a voltage detection unit 25, a power outage determination unit 26, and a first communication terminal 28. The voltage detection unit 25 detects the voltage (system voltage) of the commercial power system CS by measuring the voltage at the first input terminal 21. The power outage determination unit 26 determines whether or not there is a power outage in the commercial power system CS based on the system voltage. If the system voltage drops below a predetermined threshold voltage, the power outage determination unit 26 determines that there is a power outage in the commercial power system CS. Then, the switch 2B switches the a-contacts 27 based on the detection result of the power outage determination unit 26.

[0082] Specifically, under normal conditions when the commercial power system CS is not experiencing a power outage, the switch 2B brings the movable contact 272 into contact with the fixed contact 271. That is, the switch 2B establishes conduction between the first input terminal 21 and the output terminal 22, and outputs commercial power supplied from the commercial power system CS from the output terminal 22 to the conductive bar 3. The commercial power is supplied to the electric device Ka from the conductive bar 3 via the branch breaker 4 and the electric wire W4.

[0083] Furthermore, during a power outage in which the commercial power system CS is powered down, the switch 2B separates the movable contact 272 from the fixed contact 271. That is, the switch 2B cuts off the connection between the first input terminal 21 and the output terminal 22, thereby cutting off the output of commercial power to the output terminal 22.

[0084] Furthermore, the voltage detection unit 25 notifies the distributed power source DS of the detection result of the grid voltage from the first communication terminal 28 via the communication line J1. The distributed power source DS further includes a second communication terminal T3 connected to the communication line J1, and receives the detection result of the grid voltage from the voltage detection unit 25 via the communication line J1 and the second communication terminal T3. Based on the detection result of the grid voltage, the distributed power source DS determines whether or not the commercial power grid CS is experiencing a power outage.

[0085] Alternatively, the power outage determination unit 26 may notify the dispersed power source DS of the determination result of a power outage in the commercial power system CS from the first communication terminal 28 via the communication line J1. The dispersed power source DS receives the power outage determination result from the power outage determination unit 26 via the communication line J1 and the second communication terminal T3. Based on the power outage determination result, the dispersed power source DS can recognize whether or not a power outage has occurred in the commercial power system CS.

[0086] The distributed power source DS of the second modified example includes a common terminal T4. In addition, the distribution board 100B has one of the multiple branch breakers 4 as a three-pole breaker 4A. The common terminal T4 is electrically connected to the breaker 4A via an electric wire W5. The three-pole primary terminal of the breaker 4A is connected to the first voltage pole conductive bar 3a, the second voltage pole conductive bar 3b, and the neutral pole conductive bar 3c, respectively. The three-pole secondary terminal of the breaker 4A is electrically connected to the common terminal T4 of the distributed power source DS via an electric wire W5.

[0087] The distributed power source DS outputs the single-phase three-wire power generated by the distributed power source DS as common power from the common terminal T4. Therefore, the common power output from the common terminal T4 of the distributed power source DS is supplied to the conductive bar 3 via the breaker 4A. In other words, the conductive bar 3 is supplied with power (common power) from the distributed power source DS.

[0088] When the commercial power system CS is not experiencing a power outage, the distributed power source DS outputs common power from the common terminal T4 and supplies the common power to the loads (including the electrical equipment Ka) of the commercial power system CS. At this time, the distributed power source DS acquires information such as the voltage and phase of the system voltage from the switch 2B via the communication line J1, and outputs common power (grid-connected output) connected to the commercial power system CS from the common terminal T4. Under normal conditions when the commercial power system CS is not experiencing a power outage, the switch 2B maintains electrical continuity between the first input terminal 21 and the output terminal 22, and the common power supplied to the conductive bar 3 is supplied to the loads (including the electrical equipment Ka) of the commercial power system CS.

[0089] When the commercial power system CS experiences a power outage, the distributed power source DS outputs common power (autonomous power) that is not interconnected with the commercial power system CS from the common terminal T4. During a power outage when the commercial power system CS experiences a power outage, the switch 2B cuts off the connection between the first input terminal 21 and the output terminal 22, and the common power is supplied to the electric device Ka.

[0090] By providing the above-described configuration, the distribution board 100B does not need to include the interconnection breaker 5 of the distribution board 100, and the interconnection breaker 5 can be omitted. Therefore, the distribution board 100B can reduce the number of internal devices compared to the distribution board 100, and the configuration can be simplified.

[0091] Furthermore, the distributed power source DS can be simplified in configuration by combining the grid-connected output terminal T1 and the independent output terminal T2 into one common terminal T4.

[0092] In the distribution board 200B of the second modification, a voltage detection unit that detects the voltage (system voltage) of the commercial power system CS and a power outage determination unit that determines whether the commercial power system CS has experienced a power outage based on the system voltage may be provided in the distributed power source DS. The distributed power source DS can detect the system voltage via the breaker 4 and the electric wire W5. The distributed power source DS then outputs the determination result of the power outage determination unit as a notification signal to the switch 2B from the second communication terminal T3 via the communication line J1. The switch 2B switches the a-contact 27 based on the notification signal. In other words, the switch 2B is controlled by the notification signal from the distributed power source DS.

[0093] In addition, instead of the configuration in which the detection result of the system voltage is notified to the distributed power source DS using the first communication terminal 28 of the switch 2B, a configuration in which an electric wire electrically connected to the first input terminal 21 is connected to the distributed power source DS, and the distributed power source DS detects the system voltage via the switch 2B may be used.

[0094] Alternatively, the distributed power source DS may be configured to directly detect the system voltage.

[0095] (5) Third Modification 9 shows a distribution board 100C of a third modified example. In the third modified example, the above-mentioned conductive bar 3 is a first conductive bar 3, the above-mentioned branch breaker 4 is a first branch breaker 4, and the above-mentioned electric device Ka is a first electric device Ka. Note that the same components as those in the distribution board 100 are denoted by the same reference numerals, and description thereof will be omitted.

[0096] The distribution board 100C further includes a second conductive bar 8 and a second branch breaker 4B. The second conductive bar 8 is connected to the secondary side of the main breaker 1. The second branch breaker 4B establishes and breaks electrical continuity between the second conductive bar 8 and the second electrical device Kb. The first input terminal 21 of the switch 2 is connected to the second conductive bar 8. The switch 2 also includes a second input terminal 23 to which power is supplied from the distributed power source DS, and has a c-contact structure that electrically connects either the first input terminal 21 or the second input terminal 23 to the output terminal 22.

[0097] The second conductive bar 8 is formed into a long plate shape using a conductive material, and is arranged inside the cabinet C1 so as to extend in the left-right direction on the right side of the main breaker 1. The distribution board 100C has three second conductive bars 8, and when distinguishing between the three second conductive bars 8, the three second conductive bars 8 may be referred to as second conductive bars 8a, 8b, and 8c, respectively.

[0098] The left end of the second conductive bar 8 is directly connected to the secondary terminal 12 of the main breaker 1 by a connection mechanism 9. Specifically, the left end of the second conductive bar 8a is directly connected to the secondary terminal 12a of the main breaker 1, the left end of the second conductive bar 8b is directly connected to the secondary terminal 12b, and the left end of the second conductive bar 8c is directly connected to the secondary terminal 12c. In other words, the second conductive bar 8a is the first voltage pole (L1 phase), the second conductive bar 8b is the second voltage pole (L2 phase), and the second conductive bar 8c is the neutral pole (N phase).

[0099] The distribution board 100C includes a plurality of second branch breakers 4B. The plurality of second branch breakers 4B are arranged in the cabinet C1, separated into upper and lower sections in front of the second conductive bar 8, with multiple second branch breakers on each side aligned in the left-right direction. The second branch breakers 4B are configured similarly to the first branch breaker 4, with the second conductive bar 8 connected to the primary terminal of the second branch breaker 4B and the second electrical device Kb electrically connected to the secondary terminal of the second branch breaker 4B via the electric wire W6. In other words, the second branch breaker 4B establishes and breaks electrical continuity between the second conductive bar 8 and the second electrical device Kb.

[0100] The switch 2 is disposed inside the cabinet C1 on the right side of the second conductive bar 8. The first input terminal 21 of the switch 2 is directly connected to the right end of the second conductive bar 8 by a connection mechanism 7C.

[0101] The output terminal 22 of the switch 2 is directly connected to the left end of the first conductive bar 3 by the connection mechanism 6, similar to the distribution boards 100, 100A, and 100B, and a description thereof will be omitted.

[0102] During a power outage, the distribution board 100C supplies standalone power only to the first electric device Ka among the first electric device Ka and the second electric device Kb. Therefore, if the first electric device Ka is an electric device that is needed during a power outage, the standalone power during a power outage can be effectively used.

[0103] The connection mechanisms 7C and 9 will be described below with reference to FIGS.

[0104] (5.1) Connection between the secondary terminal of the main breaker and the second conductive bar The secondary terminals 12 of the main breaker 1 and the second conductive bars 8 are directly connected by a connection mechanism 9. The connection mechanism 9 includes three screws 91, screw holes 92 in each of the three secondary terminals 12, and insertion holes 93 in each of the three second conductive bars 8, as shown in FIG.

[0105] Specifically, the secondary terminals 12a, 12b, and 12c of the main breaker 1 are arranged in the order 12a, 12c, and 12b from top to bottom at the right end of the case of the main breaker 1. A screw hole 92 with a circular cross section is formed in each of the secondary terminals 12a, 12b, and 12c. The second conductive bars 8a, 8b, and 8c are arranged in the order 8a, 8c, and 8b from top to bottom. A through-hole 93 with a circular cross section is formed in the left end of each of the second conductive bars 8a, 8b, and 8c. The left end of the second conductive bar 8a is located in front of the secondary terminal 12a, the left end of the second conductive bar 8b is located in front of the secondary terminal 12b, and the left end of the second conductive bar 8c is located in front of the secondary terminal 12c.

[0106] The first screw 91 is inserted through the insertion hole 93 of the second conductive bar 8a from the front surface of the second conductive bar 8a and tightened into the screw hole 92 of the secondary terminal 12a, thereby directly connecting the secondary terminal 12a and the second conductive bar 8a. The second screw 91 is inserted through the insertion hole 93 of the second conductive bar 8b from the front surface of the second conductive bar 8b and tightened into the screw hole 92 of the secondary terminal 12b, thereby directly connecting the secondary terminal 12b and the second conductive bar 8b. The third screw 91 is inserted through the insertion hole 93 of the second conductive bar 8c from the front surface of the second conductive bar 8c and tightened into the screw hole 92 of the secondary terminal 12c, thereby directly connecting the secondary terminal 12c and the second conductive bar 8c.

[0107] As described above, the secondary terminal 12 of the main breaker 1 and the second conductive bar 8 are directly connected by the connection mechanism 9. Therefore, the distribution board 100C can simplify the configuration for electrical connection between the secondary terminal 12 and the second conductive bar 8 compared to a configuration in which the secondary terminal 12 and the second conductive bar 8 are indirectly connected via an electric wire. In other words, the distribution board 100C can simplify the configuration for electrical connection of the switch 2.

[0108] (5.2) Connection between the input terminal of the switch and the second conductive bar The input terminals 21 of the switch 2 and the second conductive bars 8 are directly connected by a connection mechanism 7C. The connection mechanism 7C includes three screws 71, screw holes 72 in the three input terminals 21, and insertion holes 74 in the three second conductive bars 8, as shown in FIG.

[0109] Specifically, the first input terminals 21 of the switch 2 are arranged in the order 21a, 21c, and 21b from top to bottom at the left end of the case of the switch 2. A screw hole 72 is formed in each of the first input terminals 21a, 21b, and 21c. The second conductive bars 8a, 8b, and 8c are arranged in the order 8a, 8c, and 8b from top to bottom. A through-hole 74 with a circular cross section is formed in the right end of each of the second conductive bars 8a, 8b, and 8c. The right end of the second conductive bar 8a is located in front of the first input terminal 21a, the right end of the second conductive bar 8b is located in front of the first input terminal 21b, and the right end of the second conductive bar 8c is located in front of the first input terminal 21c.

[0110] The first screw 71 is inserted through the insertion hole 74 of the second conductive bar 8a from the front surface of the second conductive bar 8a and screwed into the screw hole 72 of the first input terminal 21a, thereby directly connecting the first input terminal 21a and the second conductive bar 8a. The second screw 71 is inserted through the insertion hole 74 of the second conductive bar 8b from the front surface of the second conductive bar 8b and screwed into the screw hole 72 of the first input terminal 21b, thereby directly connecting the first input terminal 21b and the second conductive bar 8b. The third screw 71 is inserted through the insertion hole 74 of the second conductive bar 8c from the front surface of the second conductive bar 8c and screwed into the screw hole 72 of the first input terminal 21c, thereby directly connecting the first input terminal 21c and the second conductive bar 8c.

[0111] As described above, the first input terminal 21 of the switch 2 and the second conductive bar 8 are directly connected by the connection mechanism 7C. Therefore, the distribution board 100C can simplify the configuration for the electrical connection between the switch 2 and the second conductive bar 8 compared to a configuration in which the first input terminal 21 and the second conductive bar 8 are indirectly connected via an electric wire. In other words, the distribution board 100C can simplify the configuration for the electrical connection of the switch 2.

[0112] Furthermore, the distribution board using the second conductive bar 8 described above may be provided with a switch 2B (see FIG. 7) of a second modified example. That is, the contact structure of the switch may be an a-contact structure that electrically connects and disconnects the first input terminal 21 and the output terminal 22. In this case, the distribution board is connected to the distributed power source DS in the same way as the distribution board 100B of the second modified example, and switches the switch 2B in the same way as the distribution board 100B.

[0113] (6) Fourth Modification In the distribution board 100, the switch 2 may have a recess 64 having an output terminal 22 therein as a connection mechanism 6D shown in FIG. 12, instead of the connection mechanism 6 (see FIG. 1). That is, the connection mechanism 6D has a recess 64 having an output terminal 22 therein. The connection mechanism 6D has a fitting structure in which the left end of the conductive bar 3 is fitted into the recess 64.

[0114] Specifically, three recesses 64 with rectangular cross sections are formed on the right surface of the switch 2. Hereinafter, when distinguishing between the three recesses 64, they may be referred to as recesses 64a, 64b, and 64c, respectively. The three recesses 64a, 64b, and 64c are arranged in the order 64a, 64c, and 64b from top to bottom on the right surface of the switch 2. The output terminal 22a of the switch 2 is arranged on the bottom surface of the recess 64a. The output terminal 22b of the switch 2 is arranged on the bottom surface of the recess 64b. The output terminal 22c of the switch 2 is arranged on the bottom surface of the recess 64c. The conductive bar 3a is inserted into the recess 64a and contacts the output terminal 22a. The conductive bar 3b is inserted into the recess 64b and contacts the output terminal 22b. The conductive bar 3c is inserted into the recess 64c and contacts the output terminal 22c.

[0115] That is, when the conductive bar 3 is inserted into the recess 64, the conductive bar 3 is fixed to the switch 2 by the recess 64 and comes into contact with the output terminal 22 arranged on the bottom surface of the recess 64, thereby connecting the conductive bar 3 and the output terminal 22.

[0116] In the fourth modification, the distribution board 100 can also simplify the configuration for the electrical connection between the switch 2 and the conductive bar 3 compared to a configuration in which the output terminal 22 and the conductive bar 3 are indirectly connected via an electric wire. That is, the distribution board 100 can simplify the configuration for the electrical connection of the switch 2.

[0117] A configuration similar to that of the connection mechanism 6D can also be applied to the connection mechanisms 6 of the distribution boards 100A, 100B, and 100C.

[0118] Furthermore, a configuration similar to that of the connection mechanism 6D can also be applied to the connection mechanisms 7, 7C, and 9 described above.

[0119] (7) Fifth Modification The configurations of the above-described embodiment and the first to fifth modifications can be combined as appropriate.

[0120] The specific direct connection structure of the connection mechanisms 6, 7, 7C, and 9 may be other than the fastening structure using the screw 71 and the fitting structure using the recess 64.

[0121] The grid breaker 5 may be located outside the cabinet C1. For example, the grid breaker 5 may be housed in another cabinet adjacent to the cabinet C1.

[0122] (8) Summary A distribution board (100, 100A, 100B, 100C) of a first aspect of the embodiment includes a switch (2, 2A, 2B), a main breaker (1), a conductive bar (3), branch breakers (4), and a connection mechanism (6, 6D). The switch (2, 2A, 2B) has an input terminal (21) and an output terminal (22), and electrically connects and disconnects the input terminal (21) and the output terminal (22). The main breaker (1) receives commercial power at its primary side, and the input terminal (21) is connected directly or indirectly to its secondary side. The conductive bar (3) is connected to the output terminal (22). The branch breaker (4) electrically connects and disconnects the conductive bar (3) and an electrical device (Ka). The connection mechanism (6, 6D) directly connects the output terminal (22) and the conductive bar (3).

[0123] The distribution board (100, 100A, 100B, 100C) described above can simplify the configuration related to the electrical connection of the switch (2).

[0124] In the distribution board (100, 100A, 100C) of the second aspect of the embodiment, in the first aspect, the input terminal (21) is the first input terminal (21). It is preferable that the switch (2, 2A) further includes a second input terminal (23) to which power is supplied from a distributed power source (DS). The switch (2, 2A) has a c-contact structure that electrically connects either the first input terminal (21) or the second input terminal (23) to the output terminal.

[0125] The distribution board (100, 100A, 100C) described above can simplify the configuration relating to the electrical connection of the switch (2) having a c-contact structure.

[0126] In the distribution board (100B) of the third aspect of the embodiment, in the first aspect, the switch (2B) preferably has an a-contact structure. The conductive bar (3) is supplied with power from a distributed power source (DS).

[0127] The distribution board (100B) described above can simplify the configuration relating to the electrical connection of the switch (2B) having an a-contact structure.

[0128] In a distribution board (100C) of a fourth aspect of the embodiment, in the first aspect, the conductive bar (3) is a first conductive bar (3), the branch breaker (4) is a first branch breaker (4), and the electric device (Ka) is a first electric device (Ka). It is preferable that the distribution board (100C) further includes a second conductive bar (8) connected to the secondary side of the main breaker (1) and a second branch breaker (4B) that electrically connects and disconnects the second conductive bar (8) and the second electric device (Kb). The input terminal (21) is connected to the second conductive bar (8).

[0129] The distribution board (100C) described above can effectively utilize independent power during a power outage if the first electric device (Ka) is an electric device that is required during a power outage.

[0130] In a distribution board (100C) according to a fifth aspect of the embodiment, in the fourth aspect, the input terminal (21) is the first input terminal (21). It is preferable that the switch (2) further includes a second input terminal (23) to which power is supplied from a distributed power source (DS). The switch (2) has a c-contact structure that electrically connects either the first input terminal (21) or the second input terminal (23) to the output terminal (22).

[0131] The distribution board (100C) described above can simplify the configuration relating to the electrical connection of the switch (2) having a c-contact structure.

[0132] In the distribution board (100C) of the sixth aspect of the embodiment, in the fourth aspect, the switch (2B) preferably has an a-contact structure. The first conductive bar (3) is supplied with power from a distributed power source (DS).

[0133] The distribution board (100C) described above can simplify the configuration relating to the electrical connection of the switch (2B) having an a-contact structure.

[0134] In the seventh aspect of the distribution board (100, 100A, 100B, 100C) according to the embodiment, in the first aspect, the connection mechanism (6) preferably includes a screw (61) that fastens the output terminal (22) and the conductive bar (3).

[0135] The distribution board (100, 100A, 100B, 100C) described above can simplify the configuration related to the electrical connection of the switch (2).

[0136] In the distribution board (100, 100A, 100A, 100C) of the eighth aspect of the embodiment, in the first aspect, the switch (2, 2A, 2B) preferably has a recess (64) having an output terminal (22) therein as the connection mechanism (6D).

[0137] The distribution board (100, 100A, 100B, 100C) described above can simplify the configuration related to the electrical connection of the switch (2).

[0138] In the distribution board (100B) of the ninth aspect according to the embodiment, in the first aspect, it is preferable that the switch (2B) is controlled by a signal from the distributed generation (DS).

[0139] The distribution board (100B) described above can easily realize the control of the switch (2B).

[0140] In the distribution board (100B) of the tenth aspect of the embodiment, in the third or sixth aspect, the switch (2B) preferably includes a voltage detection unit (25) that detects the voltage of a commercial power system (CS) that supplies commercial power, and the voltage detection unit (25) preferably notifies the distributed power source (DS) of the voltage detection result.

[0141] The distribution board (100B) described above can easily realize the control of the distributed power sources (DS). [Explanation of symbols]

[0142] 100, 100A, 100B, 100C distribution board 1 Main breaker 2, 2A, 2B switch 21 Input terminal (first input terminal) 22 Output terminal 23 Second input terminal 25 Voltage detection section 3 Conductive bar (first conductive bar) 4 Branch breaker (first branch breaker) 4B Second branch breaker 6, 6D connection mechanism 61 Screw 64 recess 8 Second conductive bar Ka Electrical Equipment (First Electrical Equipment) DS Distributed Power

Claims

1. a switch having an input terminal and an output terminal, and electrically connecting and disconnecting the input terminal and the output terminal; a main breaker to which commercial power is supplied at a primary side and to which the input terminal is directly or indirectly connected at a secondary side; a conductive bar connected to the output terminal; a branch breaker that electrically connects and disconnects the conductive bar and the electrical equipment; a connection mechanism for directly connecting the output terminal and the conductive bar; Distribution board.

2. the input terminal is a first input terminal, The switch is a second input terminal to which power is supplied from a distributed power source; A contact c structure is provided to electrically connect either the first input terminal or the second input terminal to the output terminal. The distribution board of claim 1.

3. The switch has an a-contact structure, The conductive bar is powered by a distributed power source. The distribution board of claim 1.

4. the conductive bar is a first conductive bar, the branch breaker is a first branch breaker, the electrical device is a first electrical device, a second conductive bar connected to the secondary side of the main breaker; a second branch breaker that electrically connects and disconnects the second conductive bar and a second electrical device; The input terminal is connected to the second conductive bar. The distribution board of claim 1.

5. the input terminal is a first input terminal, The switch is a second input terminal to which power is supplied from a distributed power source; A contact c structure is provided to electrically connect either the first input terminal or the second input terminal to the output terminal. The distribution board of claim 4.

6. The switch has an a-contact structure, The first conductive bar is powered by a distributed power source. The distribution board of claim 4.

7. The connection mechanism includes a screw for fastening the output terminal and the conductive bar. The distribution board of claim 1.

8. The switch has a recess having the output terminal therein as the connection mechanism. The distribution board of claim 1.

9. The switch is controlled by a signal from the distributed power source. The distribution board according to claim 3 or 6.

10. the switch includes a voltage detection unit that detects a voltage of a commercial power system that supplies the commercial power, The voltage detection unit notifies the distributed power source of the voltage detection result. The distribution board according to claim 3 or 6.

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