Power switching system, distribution board, and power supply system

Abstract

A different method from conventional approaches will be used to switch between grid power and distributed power sources. [Solution] The power switching system 2a comprises a switching unit 204, a switching control unit 203, and a control unit 202. The switching unit 204 switches the power supply to the load between at least grid power and distributed power. The switching control unit 203 controls the switching of power by the switching unit 204. The control unit 202 controls the switching control unit 203 according to the power supply status from at least the grid power among the grid power and distributed power. The switching unit 204 switches the connection state between at least a first connection state and a second connection state. The switching control unit 203 has an actuator 210 and a switching control mechanism 211. The switching control mechanism 211 controls the switching of the connection state by the switching unit 204 using the rotational force of the actuator 210.

Description

Technical Field

[0001] The present disclosure relates to a power switching system, a distribution board, and a power supply system. More specifically, the present disclosure relates to a power switching system, a distribution board, and a power supply system that switch a power source for supplying power to a load among a plurality of power sources.

Background Art

[0002] Conventionally, a power source switching switch (power switching system) that switches between a commercial power source (system power source) and other power sources (distributed power sources) is known (for example, see Patent Document 1).

[0003] The power source switching switch described in Patent Document 1 includes two solenoids (actuators), and uses the two solenoids to rotate a crossbar left and right to bring a contact bar into contact with one of two fixed contacts. [[ID=!7]]

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, a different method from the conventional one is required for switching between a system power source and a distributed power source.

[0006] An object of the present disclosure is to provide a power switching system, a distribution board, and a power supply system capable of switching between a system power source and a distributed power source by a method different from the conventional one.

Means for Solving the Problems

[0007] A power switching system according to one aspect of the present disclosure comprises a switching unit, a switching control unit, and a control unit. The switching unit switches the power supply to a load between at least a grid power supply and a distributed power supply. The switching control unit controls the switching of the power supply by the switching unit. The control unit controls the switching control unit according to the power supply status from at least the grid power supply among the grid power supply and the distributed power supply. The switching unit switches the connection state between a first connection state in which at least the grid power supply and the load are electrically connected and a second connection state in which the distributed power supply and the load are electrically connected. The switching control unit comprises an actuator and a switching control mechanism. The actuator generates a rotational force. The switching control mechanism uses the rotational force of the actuator to control the switching of the connection state by the switching unit.

[0008] A distribution board according to one aspect of the present disclosure comprises the power switching system and a cabinet housing the power switching system.

[0009] A power supply system according to one aspect of this disclosure comprises the power switching system and the distributed power source. [Effects of the Invention]

[0010] According to one aspect of this disclosure, a power switching system, a distribution board, and a power supply system make it possible to switch between grid power sources and distributed power sources in a manner different from conventional methods. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 is a schematic diagram showing the configuration of a distribution board and power supply system according to Embodiment 1. [Figure 2] Figure 2 is a front view of the same distribution board. [Figure 3] Figure 3 is a schematic diagram showing the configuration of the switch in the distribution panel shown above. [Figure 4] Figure 4 is a perspective view showing the main components of the switch shown above. [Figure 5] Figure 5 is another perspective view showing the main components of the same switch. [Figure 6] Figure 6 is yet another perspective view showing the main components of the same switch. [Figure 7] Figure 7 is a front view illustrating the configuration of the switching section of the above-mentioned switch when the grid power supply and the load are connected. [Figure 8] Figure 8 is a front view illustrating the configuration of the switching section of the above-mentioned switch when a distributed power supply and a load are connected. [Figure 9] Figure 9 is a schematic plan view showing the switching control mechanism in a switch according to a modified example 1 of Embodiment 1. [Figure 10] Figure 10 is another plan view schematically showing the switching control mechanism in the same switch. [Figure 11] Figure 11 is a schematic front view showing the switching control mechanism in a switch according to Embodiment 2. [Figure 12] Figure 12 is another front view schematically illustrating the switching control mechanism in the same switch. [Figure 13] Figure 13 is a front view illustrating the configuration of the switching section of the above-mentioned switch when the grid power supply and the load are connected. [Figure 14] Figure 14 is a front view illustrating the configuration of the switching section of the above-mentioned switch when a distributed power supply and a load are connected. [Figure 15] Figure 15 is a front view illustrating the configuration of the switching section when a grid power supply and a load are connected, relating to a modification 1 of Embodiment 2. [Figure 16] Figure 16 is a front view illustrating the configuration of the switching section of the above-mentioned switch when a distributed power supply and a load are connected. [Figure 17] Figure 17 is an enlarged view of the heart cam mechanism in a switch according to a modified example 2 of Embodiment 2. [Figure 18] Figure 18 is a front view of the same switch when the third terminal is in the neutral position. [Figure 19] FIG. 19 is a front view of a case where a third terminal in a switch according to a modification 3 of Embodiment 2 is connected to another distributed power source.

Mode for Carrying Out the Invention

[0012] Hereinafter, a power switching system, a distribution board, and a power supply system according to Embodiments 1 and 2 will be described with reference to the drawings. The drawings referred to in the following Embodiments 1, 2, etc. are schematic drawings, and the sizes and thicknesses of the components in the drawings do not necessarily reflect the actual dimensions, and the ratios of the sizes and thicknesses between the components also do not necessarily reflect the actual dimensional ratios.

[0013] (Embodiment 1) (1) Overview First, an overview of the power switching system 2a, the distribution board 100, and the power supply system 200 according to Embodiment 1 will be described with reference to FIGS. 1 to 3.

[0014] As shown in FIG. 1, the power supply system 200 according to Embodiment 1 is a system that supplies power supplied from a commercial power system CS or a distributed power source DS to a plurality of loads L1 provided in a facility. The facility is, for example, a residential facility such as a single-family house or each household in an apartment house, or a non-residential facility such as a factory, a store, an office building, a commercial building, a hospital, or a school. In this embodiment, as an example, the facility is a single-family house. As shown in FIG. 1, the power supply system 200 includes a distribution board 100, a commercial power system CS, a distributed power source DS, and a plurality of loads L1. In the following description, the commercial power system CS is also referred to as the system power source CS.

[0015] The distribution board 100 is attached to a building material such as a wall, for example. As shown in Figure 1, the distribution board 100 comprises a main breaker 1, a switch 2, a plurality of (three in the illustrated example) conductive bars 3, a plurality of (fourteen in the illustrated example) branch breakers 4, a grid-connecting breaker 5, and a cabinet C1. As shown in Figures 1 and 2, the cabinet C1 houses the main breaker 1, the switch 2 as a power switching system 2a, the plurality of conductive bars 3, the plurality of branch breakers 4, and the grid-connecting breaker 5.

[0016] The switch 2, as a power switching system 2a, is a device that switches the power supplied to multiple loads L1 installed in a facility between power supplied from the commercial power grid CS and power supplied from a distributed power source DS. As shown in Figure 3, the switch 2 comprises a switching unit 204, a switching control unit 203, and a control unit 202. The switching unit 204 switches the power supply to the loads L1 between at least the commercial power grid (grid power) CS and the distributed power source DS. The switching control unit 203 controls the power supply switching by the switching unit 204. The control unit 202 controls the switching control unit 203 according to the state of at least the grid power CS among the grid power CS and the distributed power source DS. The switching unit 204 switches the connection state between a first connection state in which at least the grid power CS and the loads L1 are electrically connected and a second connection state in which the distributed power source DS and the loads L1 are electrically connected. The switching control unit 203 has an actuator 210 and a switching control mechanism 211. The actuator 210 generates rotational force. The switching control mechanism 211 controls the switching of the connection state by the switching unit 204 using the rotational force of the actuator 210.

[0017] In the power switching system 2a according to Embodiment 1, the switching control mechanism 211 controls the switching of the connection state by the switching unit 204 using the rotational force of the actuator 210. Therefore, according to the power switching system 2a according to Embodiment 1, it is possible to switch between grid power supply CS and distributed power supply DS in a different manner than conventional methods.

[0018] (2)Details Next, the components of the power switching system 2a, the distribution board 100, and the power supply system 200 according to Embodiment 1 will be described with reference to Figures 1 to 8. In the following description, unless otherwise specified, the longitudinal direction of the cabinet C1 is defined as the left-right direction, the short direction (width direction) of the cabinet C1 is defined as the up-down direction, and the thickness direction (depth direction) of the cabinet C1 is defined as the front-back direction. However, these directions are not intended to limit the direction in which the distribution board 100 is used. Also, the arrows indicating "up," "down," "left," and "right" in Figure 2 are for illustrative purposes only and do not represent any actual physical object.

[0019] The power supply system 200 according to Embodiment 1 is a grid connection system that can switch the power supply system to a load L1 between a commercial power grid CS and a distributed power source DS. As shown in Figure 1, the power supply system 200 according to Embodiment 1 comprises a distribution board 100, a commercial power grid CS, a distributed power source DS, and a plurality of loads L1.

[0020] (2.1) Distribution board The distribution board 100 is, for example, a residential distribution board (a 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; it may also be a cabinet-type distribution board used in a three-phase three-wire or three-phase four-wire power distribution system.

[0021] The distribution board 100 includes a cabinet C1 for housing internal equipment (see Figures 1 and 2). The cabinet C1 is a rectangular box with an open front and is attached to a building material such as a wall. In Figures 1 and 2, the illustration of covers and the like that which can be opened and closed or attached to the opening on the front of the cabinet C1 is omitted.

[0022] The distribution board 100 includes, as internal equipment housed in the cabinet C1, a main circuit breaker (main switch) 1, a switch 2, a plurality of (three in the illustrated example) conductive bars 3, a plurality of (fourteen in the illustrated example) branch circuit breakers 4, and a grid-connecting circuit breaker 5. These internal equipment are attached to the cabinet C1 either directly or indirectly via mounting parts, etc. In other words, the distribution board 100 according to Embodiment 1 includes a switch 2 (power switching system 2a) and a cabinet C1 that houses the switch 2. The power supply system 200 according to Embodiment 1 also includes a switch 2 (power switching system 2a) and a distributed power supply DS.

[0023] (2.1.1) Main circuit breaker The main circuit breaker 1 is located inside cabinet C1, slightly to the left of the center in the left-right direction. Three primary terminals 11 (see Figure 2) are provided at the upper end of the case 10 of the main circuit breaker 1, and three secondary terminals 12 (see Figure 2) are provided at the right end of the case 10 of the main circuit breaker 1. In the following description, when it is necessary to distinguish between the three primary terminals 11, they may be referred to as primary terminals 11a, 11b, and 11c. Similarly, when it is necessary to distinguish between the three secondary terminals 12, they may be referred to as secondary terminals 12a, 12b, and 12c.

[0024] The main circuit breaker 1 has contacts within the case 10 that electrically connect and disconnect between the primary terminal 11 and the secondary terminal 12. The main circuit breaker 1 also has an operating lever 13 on the front of the case 10 for turning the contacts on or off. The main circuit breaker 1 has a function to detect overcurrent abnormalities, such as short-circuit current or overload current, which flow through the contacts, and when an overcurrent abnormality is detected, it opens the contacts. That is, when the main circuit breaker 1 detects an overcurrent abnormality, it cuts off the power supply to the secondary circuit of the main circuit breaker 1. The main circuit breaker 1 may also have a limiter function that opens the contacts when a current exceeding a predetermined limit value flows. Furthermore, the main circuit breaker 1 may also have a function that opens the contacts when it detects leakage current, neutral wire phase loss, etc.

[0025] The primary terminal 11 is connected to a single-phase three-wire power line W1 drawn from the commercial power grid CS. More specifically, the power line for the first voltage pole (L1 phase) of power line W1 is connected to the primary terminal 11a. The power line for the second voltage pole (L2 phase) of power line W1 is connected to the primary terminal 11b. The power line for the neutral pole (N phase) of power line W1 is connected to the primary terminal 11c. In other words, commercial power is supplied to the primary terminal 11.

[0026] The primary terminal 11a and the secondary terminal 12a are electrically connected and disconnected via the contacts of the main circuit breaker 1. Similarly, the primary terminal 11b and the secondary terminal 12b are electrically connected and disconnected via the contacts of the main circuit breaker 1. Furthermore, the primary terminal 11c and the secondary terminal 12c are electrically connected and disconnected via the contacts of the main circuit breaker 1. The first input terminal 21 of the switch 2 is connected to the secondary terminal 12.

[0027] (2.1.2) Switch The switch 2, as part of the power switching system 2a, is a device that switches the power supplied to multiple loads L1 installed within the facility between power supplied from the commercial power grid CS and power supplied from a distributed power source DS.

[0028] Switch 2 is located inside cabinet C1, to the right of the main circuit breaker 1. Three first input terminals 21 (see Figure 2) are provided at the left end of the case 20 of switch 2, and three output terminals 22 (see Figure 2) are provided at the right end of the case 20 of switch 2. In addition, three second input terminals 23 (see Figure 2) are provided at the top end of the case 20 of switch 2. Switch 2 has a c-contact structure that electrically connects the first input terminals 21 or the second input terminals 23 to the output terminals 22.

[0029] In the following explanation, when it is necessary to distinguish between the three first input terminals 21, they may be referred to as first input terminals 21a, 21b, and 21c, respectively. Similarly, when it is necessary to distinguish between the three output terminals 22, they may be referred to as output terminals 22a, 22b, and 22c, respectively. Similarly, when it is necessary to distinguish between the three second input terminals 23, they may be referred to as second input terminals 23a, 23b, and 23c, respectively.

[0030] The first input terminal 21 is connected to the secondary terminal 12 of the main circuit breaker 1. More specifically, the first input terminal 21a is electrically connected to the secondary terminal 12a of the main circuit breaker 1. The first input terminal 21b is electrically connected to the secondary terminal 12b of the main circuit breaker 1. The first input terminal 21c is electrically connected to the secondary terminal 12c of the main circuit breaker 1.

[0031] A conductive bar 3 is connected to output terminal 22. More specifically, output terminal 22a is electrically connected to conductive bar 3a (see Figures 1 and 2) of the three conductive bars 3 described later. Output terminal 22b is electrically connected to conductive bar 3b (see Figures 1 and 2) of the three conductive bars 3. Output terminal 22c is electrically connected to conductive bar 3c (see Figures 1 and 2) of the three conductive bars 3.

[0032] The independent output terminal T2 of the distributed power supply DS is electrically connected to the second input terminal 23 via the wire W3. More specifically, the second input terminal 23a is electrically connected to the power line of the first voltage pole (L1 phase) of the wire W3. The second input terminal 23b is electrically connected to the power line of the second voltage pole (L2 phase) of the wire W3. The second input terminal 23c is electrically connected to the power line of the neutral pole (N phase) of the wire W3.

[0033] In other words, the switch 2 selectively supplies either commercial power supplied from the commercial power grid CS, or independent power output from the independent output terminal T2 of the distributed power source DS, to the conductive bar 3 via the output terminal 22. The independent power is supplied using a single-phase three-wire distribution system.

[0034] As shown in Figure 3, the switch 2 includes a detection unit 201, a control unit 202, a switching control unit 203, and a switching unit 204. The switch 2 operates using power from the grid power supply CS or the distributed power supply DS as its operating power source.

[0035] Switcher 2 has, for example, a computer system including one or more processors and one or more memories. The computer system functions as a control unit 202 by having the processor execute a program stored in the memory. The program executed by the processor is, in this case, pre-recorded in the computer system's memory, but it may also be provided by being recorded on a non-temporary recording medium such as a memory card, or by being provided via a telecommunications line such as the Internet.

[0036] The detection unit 201 detects the power supply status from at least the grid power supply CS, which is one of the grid power supply CS and the distributed power supply DS. In this embodiment, the detection unit 201 detects the power supply status from both the grid power supply CS and the distributed power supply DS. Specifically, the detection unit 201 detects the voltage applied by each of the grid power supply CS and the distributed power supply DS.

[0037] The detection unit 201 detects, for example, the voltage (first voltage) applied to the contact electrically connected to the power line of the second voltage pole (L2 phase) of the electric wire W1. Furthermore, the detection unit 201 detects, for example, the voltage (second voltage) applied to the contact electrically connected to the power line of the second voltage pole (L2 phase) of the electric wire W3.

[0038] The control unit 202 controls the switching control unit 203 according to the power supply status from at least the grid power supply CS, which is one of the grid power supply CS and the distributed power supply DS. In this embodiment, the control unit 202 controls the switching control unit 203 according to the power supply status from both the grid power supply CS and the distributed power supply DS. Specifically, the control unit 202 outputs current to the actuator 210 of the switching control unit 203 according to the power supply status from both the grid power supply CS and the distributed power supply DS.

[0039] The control unit 202 determines that the power supply status from the grid power supply CS is in a state where power is being supplied (hereinafter also referred to as the "first state") if the first voltage detected by the detection unit 201 is greater than a first predetermined value. The control unit 202 determines that the power supply status from the grid power supply CS is in a state where power is not being supplied (hereinafter also referred to as the "second state") if the first voltage detected by the detection unit 201 is less than or equal to the first predetermined value.

[0040] Furthermore, the control unit 202 determines that the power supply status from the distributed power supply DS is in a state where power is being supplied (hereinafter also referred to as the "third state") if the second voltage detected by the detection unit 201 is greater than the second predetermined value. The control unit 202 determines that the power supply status from the distributed power supply DS is in a state where power is not being supplied (hereinafter also referred to as the "fourth state") if the second voltage detected by the detection unit 201 is less than or equal to the second predetermined value.

[0041] When the load L1 is electrically connected to the grid power supply CS, the control unit 202 controls the switching control unit 203 to switch the connection destination of the load L1 from the grid power supply CS to the distributed power supply DS when the power supply state from the grid power supply CS switches from the first state to the second state. Also, when the load L1 is electrically connected to the distributed power supply DS, the control unit 202 controls the switching control unit 203 to switch the connection destination of the load L1 from the distributed power supply DS to the grid power supply CS when the power supply state from the grid power supply CS switches from the second state to the first state.

[0042] Furthermore, the control unit 202 may control the switching control unit 203 to switch the connection destination of load L1 from the grid power supply CS to the distributed power supply DS when the power supply state from the grid power supply CS switches from the first state to the second state, provided that load L1 is electrically connected to the grid power supply CS and the power supply state from the distributed power supply DS is in the third state. In addition, the control unit 202 may control the switching control unit 203 to switch the connection destination of load L1 from the distributed power supply DS to the grid power supply CS when the power supply state from the grid power supply CS switches from the second state to the first state, provided that load L1 is electrically connected to the distributed power supply DS and the power supply state from the distributed power supply DS is in the third or fourth state.

[0043] Furthermore, the control unit 202 may control the switching control unit 203 to switch the connection destination of the load L1 from the distributed power supply DS to the grid power supply CS when the power supply state from the distributed power supply DS switches from the third state to the fourth state, provided that the load L1 is electrically connected to the distributed power supply DS and the power supply state from the grid power supply CS is in the first state.

[0044] The switching control unit 203 controls the switching of the power supply by the switching unit 204. As shown in Figure 3, the switching control unit 203 includes an actuator 210 and a switching control mechanism 211. The actuator 210 generates rotational force. The switching control mechanism 211 uses the rotational force of the actuator 210 to control the switching of the connection state by the switching unit 204.

[0045] The actuator 210 generates rotational force using power from a grid power supply CS or a distributed power supply DS as its operating power source. The actuator 210 includes a solenoid that generates rotational force when energized from the grid power supply CS or the distributed power supply DS. The solenoid is, for example, a rotary solenoid. The solenoid of the actuator 210 is rotatable in a first direction D1 and a second direction D2 which is opposite to the first direction D1 (see Figure 4).

[0046] The switching control mechanism 211 includes a clutch mechanism 213 (see Figure 5) and a return spring 215 (see Figure 4), as shown in Figures 4 to 6.

[0047] The clutch mechanism 213 is, for example, a one-way clutch that transmits rotational force only in the first direction D1. The clutch mechanism 213 is integrally assembled with the rotating shaft 212 (see Figure 6) inside the rotating shaft 212. The clutch mechanism 213 is also integrally assembled with the rotating shaft of the actuator 210. As a result, the clutch mechanism 213 transmits the rotational force generated by the actuator 210 to the switching mechanism 220 of the switching unit 204, which will be described later, via the rotating shaft 212.

[0048] The return spring 215 is, for example, a torsion spring and is housed within the casing of the actuator 210 (see Figure 4). When the actuator 210 rotates in the first direction D1, the return spring 215 rotates in the second direction D2, which is opposite to the first direction D1, generating a rotational force along the second direction D2. In other words, the actuator 210 rotates in the second direction D2 due to the rotational force from the return spring 215.

[0049] The switching unit 204 switches the power supply to the load L1 between at least the grid power supply CS and the distributed power supply DS. The switching unit 204 switches the connection state between a first connection state in which at least the grid power supply CS and the load L1 are electrically connected (see Figure 7) and a second connection state in which the distributed power supply DS and the load L1 are electrically connected (see Figure 8).

[0050] As shown in Figures 7 and 8, the switching unit 204 includes a switching mechanism 220, a first terminal 221, a second terminal 222, and a third terminal 223. The first terminal 221 is connected to the grid power supply CS. The second terminal 222 is connected to the distributed power supply DS. The third terminal 223 is connected to the load L1. The switching mechanism 220 switches the connection destination of the third terminal 223 between the first terminal 221 and the second terminal 222 using a sliding contact connection.

[0051] The switching unit 204 is provided with three first terminals 221 (see Figure 4). When it is necessary to distinguish between the three first terminals 221, they may be referred to as first terminals 221a, 221b, and 221c, respectively.

[0052] The first terminal 221a is electrically connected to the first input terminal 21a. That is, the first terminal 221a is electrically connected to the secondary terminal 12a of the main circuit breaker 1 via the first input terminal 21a. The first terminal 221b is electrically connected to the first input terminal 21b. That is, the first terminal 221b is electrically connected to the secondary terminal 12b of the main circuit breaker 1 via the first input terminal 21b. The first terminal 221c is electrically connected to the first input terminal 21c. That is, the first terminal 221c is electrically connected to the secondary terminal 12c of the main circuit breaker 1 via the first input terminal 21c.

[0053] The switching unit 204 is provided with three second terminals 222 (see Figure 5). When it is necessary to distinguish between the three second terminals 222, they may be referred to as second terminals 222a, 222b, and 222c, respectively.

[0054] The second terminal 222a is electrically connected to the second input terminal 23a. That is, the second terminal 222a is connected to the power line of the first voltage pole (L1 phase) of wire W3 via the second input terminal 23a. The second terminal 222b is electrically connected to the second input terminal 23b. That is, the second terminal 222b is connected to the power line of the second voltage pole (L2 phase) of wire W3 via the second input terminal 23b. The second terminal 222c is electrically connected to the second input terminal 23c. That is, the second terminal 222c is connected to the power line of the neutral pole (N phase) of wire W3 via the second input terminal 23c.

[0055] The switching unit 204 is provided with three third terminals 223 (see Figure 6). When it is necessary to distinguish between the three third terminals 223, they may be referred to as third terminals 223a, 223b, and 223c.

[0056] The third terminal 223a is electrically connected to the output terminal 22a. That is, the third terminal 223a is connected to conductive bar 3a of the three conductive bars 3 via the output terminal 22a. The third terminal 223b is electrically connected to the output terminal 22b. That is, the third terminal 223b is connected to conductive bar 3b of the three conductive bars 3 via the output terminal 22b. The third terminal 223c is electrically connected to the output terminal 22c. That is, the third terminal 223c is connected to conductive bar 3c of the three conductive bars 3 via the output terminal 22c.

[0057] The switching section 204 is provided with three switching mechanisms 220. Each switching mechanism 220 switches the connection destination of the third terminal 223 between the first terminal 221 and the second terminal 222 using a sliding contact connection.

[0058] Each switching mechanism 220 includes a pair of terminal pieces 2201 and a contact pressure spring 2202, as shown in Figures 7 and 8. The pair of terminal pieces 2201 are positioned at both ends in the expansion / contraction direction, which is the direction in which the contact pressure spring 2202 expands and contracts, and are opposite each other in the expansion / contraction direction. The pair of terminal pieces 2201 are electrically connected via a braided wire. Each switching mechanism 220 is housed inside the aforementioned rotating shaft 212 and rotates together with the rotating shaft 212. In the switching unit 204, as the rotating shaft 212 rotates in the first direction D1, the switching mechanism 220 rotates, switching between a state in which the first terminal 221 and the third terminal 223 are connected via the switching mechanism 220 (the state shown in Figure 7), or a state in which the second terminal 222 and the third terminal 223 are connected via the switching mechanism 220 (the state shown in Figure 8).

[0059] Here, the contact surfaces of the first terminal 221, the second terminal 222, and the third terminal 223 with the switching mechanism 220 are provided along the rotational direction of the switching mechanism 220 (i.e., the first direction D1). As a result, when the switching mechanism 220 rotates, the switching mechanism 220 slides against the first terminal 221 and the third terminal 223, resulting in a state where the first terminal 221 and the third terminal 223 are in contact, or the switching mechanism 220 slides against the second terminal 222 and the third terminal 223, resulting in a state where the second terminal 222 and the third terminal 223 are in contact.

[0060] Furthermore, as shown in Figures 4 to 6, the switch 2 further includes a first gear 61, a second gear 62, a third gear 63, a manual lever 64, a first spring 65, and a second spring 66.

[0061] The outer surface of the first gear 61 is marked with symbols indicating the connection status between the grid power supply CS or distributed power supply DS and the load L1. Specifically, the outer surface of the first gear 61 is alternately marked with symbols "1" indicating a first connection state in which the grid power supply CS and the load L1 are electrically connected, and symbols "2" indicating a second connection state in which the distributed power supply DS and the load L1 are electrically connected, along the circumferential direction of the first gear 61.

[0062] As shown in Figure 7, when the first terminal 221 to which the grid power supply CS is electrically connected and the third terminal 223 to which the load L1 is electrically connected are electrically connected via the switching mechanism 220, the symbol "1" indicating the first connection state is visible from the outside through the opening provided in the case 20. Also, as shown in Figure 8, when the second terminal 222 to which the distributed power supply DS is electrically connected and the third terminal 223 to which the load L1 is electrically connected are electrically connected via the switching mechanism 220, the symbol "2" indicating the second connection state is visible from the outside through the opening provided in the case 20.

[0063] The second gear 62 is configured to mesh with the first gear 61. That is, the first gear 61 is configured to rotate in the opposite direction to the rotation of the second gear 62 as the second gear 62 rotates.

[0064] The third gear 63 is configured to rotate integrally with the rotating shaft 212 and the second gear 62. That is, the third gear 63 is configured to rotate in the same direction as the rotating shaft 212 and the second gear 62. The third gear 63 is subjected to an elastic force from the first spring 65 (see Figures 5 and 6) that moves it toward the manual lever 64 (upward in Figure 4).

[0065] The manual lever 64 is a lever used by the user to switch between the first and second connection states. The manual lever 64 is subjected to an elastic force from the second spring 66 (see Figure 4) that moves it away from the third gear 63 (upward in Figure 4). When the user switches between the first and second connection states by manual operation, the manual lever 64 is pushed toward the third gear 63 against the elastic force from the second spring 66, and then rotated to switch between the first and second connection states. At this time, the first gear 61 and the second gear 62 also rotate along with the rotation of the third gear 63, so the sign indicated by the first gear 61 is also switched.

[0066] (2.1.3) Conductive bar Each of the three conductive bars 3 is formed into a long, plate-like shape using a conductive material. Each conductive bar 3 is positioned to the right of the switch 2 inside the cabinet C1, extending along the left-right direction. In the following description, when it is necessary to distinguish between the three conductive bars 3, they may be referred to as conductive bar 3a, 3b, and 3c, respectively.

[0067] Each of the three conductive bars 3 is connected to the output terminal 22 of the switch 2. More specifically, the left end of conductive bar 3a is connected to output terminal 22a, the left end of conductive bar 3b is connected to output terminal 22b, and the left end of conductive bar 3c is connected to output terminal 22c. That is, conductive bar 3a is the first voltage pole (L1 phase), conductive bar 3b is the second voltage pole (L2 phase), and conductive bar 3c is the neutral pole (N phase).

[0068] (2.1.4) Branch circuit breaker The multiple branch circuit breakers 4 are arranged inside the cabinet C1, divided into upper and lower sections in front of the conductive bar 3, with multiple breakers on each section arranged in a left-right direction.

[0069] Each of the multiple branch circuit breakers 4 has a pair of primary terminals and a pair of secondary terminals. Each branch circuit breaker 4 has contacts within the case 40 that electrically connect or disconnect the primary and secondary terminals. Each branch circuit breaker 4 also has an operating lever 41 on the front of the case 40 for turning the contacts on or off.

[0070] There are two types of branch circuit breakers 4: one for 100V and one for 200V. The pair of primary terminals on the 100V branch circuit breaker 4 are connected to one of the conductive bars 3a (first voltage pole) and 3b (second voltage pole), and to the conductive bar 3c (neutral pole), respectively. The pair of primary terminals on the 200V branch circuit breaker 4 are connected to the conductive bar 3a (first voltage pole) and the conductive bar 3b (second voltage pole), respectively. In addition, a load L1 is electrically connected to the pair of secondary terminals on the branch circuit breaker 4 via a wire W4. The load L1 includes, for example, electrical appliances such as lighting fixtures and hot water supply equipment, as well as wiring devices such as outlets and wall switches.

[0071] The branch circuit breaker 4 is equipped with a function to detect overcurrent abnormalities, such as short-circuit current or overload current, which flow through the contacts. When an overcurrent abnormality is detected, it opens the contacts. In other words, when the branch circuit breaker 4 detects an overcurrent abnormality, it cuts off the power supply to the load L1. As described above, the branch circuit breaker 4 electrically connects and disconnects the conductive bar 3 and the load L1.

[0072] (2.1.5) Interconnection breaker The interconnection breaker 5 is located inside cabinet C1, to the left of the main breaker 1. Three primary terminals 51 (see Figure 2) are provided at the upper end of the case 50 of the interconnection breaker 5, and three secondary terminals 52 (see Figure 2) are provided at the lower end of the case 50 of the interconnection breaker 5. In the following description, when it is necessary to distinguish between the three primary terminals 51, they may be referred to as primary terminals 51a, 51b, and 51c. Similarly, when it is necessary to distinguish between the three secondary terminals 52, they may be referred to as secondary terminals 52a, 52b, and 52c.

[0073] The interconnection breaker 5 has contacts within the case 50 that electrically connect and disconnect between the primary terminal 51 and the secondary terminal 52. The interconnection breaker 5 also has an operating lever 53 on the front of the case 50 for turning the contacts on or off. The interconnection breaker 5 is equipped with a function to detect overcurrent abnormalities, such as short-circuit current or overload current, which flow through the contacts, and opens the contacts when an overcurrent abnormality is detected. The interconnection breaker 5 may also have a function to open the contacts when it detects leakage current, neutral wire phase loss, etc.

[0074] The primary terminal 51 is electrically connected to the single-phase three-wire power line W1 of the commercial power grid CS. More specifically, the primary terminal 51a is electrically connected to the power line of the first voltage pole (L1 phase) of power line W1. The primary terminal 51b is electrically connected to the power line of the second voltage pole (L2 phase) of power line W1. The primary terminal 51c is electrically connected to the power line of the neutral pole (N phase) of power line W1.

[0075] The secondary terminal 52 is electrically connected to the interconnection output terminal T1 of the distributed power supply DS via the wire W2. More specifically, the secondary terminal 52a is electrically connected to the power line of the first voltage pole (L1 phase) of the wire W2. The secondary terminal 52b is electrically connected to the power line of the second voltage pole (L2 phase) of the wire W2. The secondary terminal 52c is electrically connected to the power line of the neutral pole (N phase) of the wire W2.

[0076] In other words, if the contacts of the interconnection breaker 5 are ON, the power output from the interconnection output terminal T1 of the distributed power supply DS is supplied to the power line W1 as an interconnection output. The distributed power supply DS controls the power output from the interconnection output terminal T1 to be connected to the commercial power grid CS. Also, if the contacts of the interconnection breaker 5 are OFF, the distributed power supply DS is disconnected from the commercial power grid CS.

[0077] (2.1.6) Distributed power generation The distributed power supply DS comprises a power generation device or an energy storage device. The power generation device is, for example, a solar power generation device, a wind power generation device, a hydroelectric power generation device, a biomass power generation device, a geothermal power generation device, a hydrogen power generation device, or a fossil fuel power generation device. The energy storage device is not limited to stationary types, but also includes batteries mounted on electric vehicles. The distributed power supply DS converts the power generated by the power generation device or the power discharged by the energy storage device into single-phase three-wire power and outputs it from the grid connection output terminal T1 or the independent output terminal T2. The distributed power supply DS outputs power connected to the commercial power grid CS from the grid connection output terminal T1. If the contacts of the grid connection breaker 5 are ON, the power output from the grid connection output terminal T1 is supplied to the power line W1 as grid connection output. The distributed power supply DS also outputs independent power from the independent output terminal T2. The independent power is supplied to the conductive bar 3 if the switch 2 is conducting between the second input terminal 23 and the output terminal 22.

[0078] The distributed power supply DS detects the voltage of the commercial power grid CS (system voltage), for example, the voltage at the interconnection output terminal T1. Based on the system voltage, the distributed power supply DS determines whether or not the commercial power grid CS has experienced a power outage. Based on this determination result, the distributed power supply DS controls the output of the interconnection output terminal T1 and the output of the independent output terminal T2.

[0079] Specifically, under normal circumstances when the commercial power grid CS is not experiencing a power outage, the distributed power supply DS outputs interconnected power from the interconnected output terminal T1 and does not output independent power from the independent output terminal T2. On the other hand, during a power outage when the commercial power grid CS is experiencing a power outage, the distributed power supply DS outputs independent power from the independent output terminal T2 and does not output interconnected power from the interconnected output terminal T1.

[0080] (3) Operation of the switch (3.1) First action This section describes the operation of switch 2 in which it switches the power supply to load L1 from grid power supply CS to distributed power supply DS.

[0081] When the power supply to load L1 is the grid power supply CS, the third terminal 223 is electrically connected to the first terminal 221 via the switching mechanism 220 (see Figure 7). That is, as shown in Figure 7, the switching mechanism 220 is in contact with the first terminal 221 and the third terminal 223.

[0082] If the detection unit 201 determines, based on its detection results, that the connection destination of load L1 should be switched from grid power supply CS to distributed power supply DS, the control unit 202 drives the actuator 210 of the switching control unit 203. For example, if the detection unit 201 determines, based on the first voltage it detects, that the power supply state from grid power supply CS has switched from a first state to a second state, the control unit 202 drives the actuator 210. More specifically, the control unit 202 supplies power from the distributed power supply DS to the actuator 210.

[0083] When the actuator 210 is driven, the clutch mechanism 213 and the rotating shaft 212 connected to the actuator 210 rotate along the first direction D1. As a result, the switching mechanism 220 housed inside the rotating shaft 212 also rotates along the first direction D1, switching from the connection state shown in Figure 7 to the connection state shown in Figure 8.

[0084] When the control unit 202 stops driving the actuator 210, that is, when the control unit 202 stops supplying power from the distributed power supply DS to the actuator 210, the actuator 210 rotates along the second direction D2, which is opposite to the first direction D1, due to the elastic force of the return spring 215. At this time, as described above, since the clutch mechanism 213 is a one-way clutch, the rotation axis 212 does not rotate along the second direction D2. Therefore, the state in which the second terminal 222 and the third terminal 223 are electrically connected via the switching mechanism 220 is maintained.

[0085] (3.2)Second operation This section describes the operation in which switch 2 switches the power supply to load L1 from the distributed power supply DS to the grid power supply CS.

[0086] When the power supply to the load L1 is a distributed power supply DS, the third terminal 223 is electrically connected to the second terminal 222 via the switching mechanism 220 (see Figure 8). That is, the switching mechanism 220 is in contact with the second terminal 222 and the third terminal 223, as shown in Figure 8.

[0087] If the detection unit 201 determines, based on its detection results, that it should switch the connection destination of load L1 from the distributed power supply DS to the grid power supply CS, the control unit 202 drives the actuator 210 of the switching control unit 203. For example, if the detection unit 201 determines, based on the first voltage it detects, that the power supply state from the grid power supply CS has switched from the second state to the first state, the control unit 202 drives the actuator 210. More specifically, the control unit 202 supplies power from the grid power supply CS to the actuator 210.

[0088] When the actuator 210 is driven, the clutch mechanism 213 and the rotating shaft 212 connected to the actuator 210 rotate along the first direction D1. As a result, the switching mechanism 220 housed inside the rotating shaft 212 also rotates along the first direction D1, switching from the connection state shown in Figure 8 to the connection state shown in Figure 7.

[0089] When the control unit 202 stops driving the actuator 210, that is, when the control unit 202 stops supplying power from the grid power supply CS to the actuator 210, the actuator 210 rotates along the second direction D2, which is opposite to the first direction D1, due to the elastic force of the return spring 215. At this time, as described above, since the clutch mechanism 213 is a one-way clutch, the rotation axis 212 does not rotate along the second direction D2. Therefore, the state in which the first terminal 221 and the third terminal 223 are electrically connected via the switching mechanism 220 is maintained.

[0090] (4) Advantages As described above, the power switching system 2a according to Embodiment 1 comprises a switching unit 204, a switching control unit 203, and a control unit 202. The switching unit 204 switches the power supply to the load L1 between at least the grid power supply CS and the distributed power supply DS. The switching control unit 203 controls the switching of the power supply by the switching unit 204. The control unit 202 controls the switching control unit 203 according to the power supply status from at least the grid power supply CS among the grid power supply CS and the distributed power supply DS. The switching unit 204 switches the connection state between a first connection state in which at least the grid power supply CS and the load L1 are electrically connected and a second connection state in which the distributed power supply DS and the load L1 are electrically connected. The switching control unit 203 includes an actuator 210 and a switching control mechanism 211. The actuator 210 generates rotational force. The switching control mechanism 211 uses the rotational force of the actuator 210 to control the switching of the connection state by the switching unit 204.

[0091] In the power switching system 2a according to Embodiment 1, the switching control mechanism 211 controls the switching of the connection state by the switching unit 204 using the rotational force of the actuator 210. Therefore, according to the power switching system 2a according to Embodiment 1, it is possible to switch between grid power supply CS and distributed power supply DS in a different manner than conventional methods.

[0092] (5) Variant The following are examples of modifications. The modifications described below can be applied in appropriate combination with Embodiment 1.

[0093] (5.1) Variation 1 In Embodiment 1, the switching control mechanism 211 includes a clutch mechanism 213 and a return spring 215. In contrast, as shown in Figures 9 and 10, the switching control mechanism 211a may include a ratchet mechanism 214 and a return spring 215 (see Figure 4).

[0094] The ratchet mechanism 214 according to Modification 1 includes a gear 2141 and a stopper 2142. The stopper 2142 is connected to the switching mechanism 220 in the rotational direction via a stopper support 2143, and the stopper 2142 is in contact with the gear 2141 by an elastic force from a spring (not shown). In the ratchet mechanism 214, when the gear 2141 attempts to rotate counterclockwise when viewed from the front, the stopper 2142 engages with the gear 2141, causing the switching mechanism 220 to rotate counterclockwise (see Figure 9). On the other hand, in the ratchet mechanism 214, when the gear 2141 attempts to rotate clockwise when viewed from the front, the stopper 2142 overcomes the gear 2141, preventing the switching mechanism 220 from rotating (see Figure 10).

[0095] In the modified example 1, the actuator 210, the ratchet mechanism 214, and the switching mechanism 220 are configured to rotate together. Therefore, when the actuator 210 is driven and rotated in the first direction D1, the stopper 2142 of the ratchet mechanism 214 engages with the gear 2141 as the actuator 210 rotates, making it possible to switch the connection state between the first connection state and the second connection state via the switching mechanism 220.

[0096] When the actuator 210 is stopped, the actuator 210 rotates in the second direction D2, which is opposite to the first direction D1, due to the elastic force of the return spring 215. At this time, the stopper 2142 of the ratchet mechanism 214 overcomes the gear 2141, so the switching mechanism 220 does not rotate in the second direction D2, and the first or second connection state is maintained.

[0097] (5.2) Variation 2 In Embodiment 1, the switch 2 is located between the main circuit breaker 1 and the branch circuit breaker 4. Alternatively, the switch 2 may be located downstream of the branch circuit breaker 4.

[0098] In this case, the first input terminal 21 of the switch 2 is electrically connected to the main circuit breaker 1. The output terminal 22 of the switch 2 is electrically connected to a branch circuit breaker other than the branch circuit breaker 4, to which a specific load L1 is connected. This makes it possible to supply power to a specific load L1 when the power supply to the load is switched from the grid power supply CS to the distributed power supply DS.

[0099] (5.3) Modification 3 In Embodiment 1, the switch 2 switches the power supply to the load L1 between the grid power supply CS and the distributed power supply DS. Alternatively, the switch 2 may switch the power supply to the load L1 between the distributed power supply DS and a distributed power supply different from the distributed power supply DS.

[0100] (5.4) Modification 4 It is not essential for the power switching system 2a (switch 2) to have multiple functions integrated into a single enclosure (case 20), and the components of the power switching system 2a may be distributed across multiple enclosures.

[0101] (Embodiment 2) The power switching system 2a according to Embodiment 2 will be described below with reference to Figures 11 to 14. Regarding the power switching system 2a according to Embodiment 2, components similar to those in the power switching system 2a according to Embodiment 1 are denoted by the same reference numerals and their descriptions are omitted.

[0102] The power switching system 2a according to Embodiment 2 differs from the power switching system 2a according to Embodiment 1 in that the switching control mechanism 211b includes a heart cam mechanism 216.

[0103] (1) Composition The power switching system 2a (switch 2) according to Embodiment 2 includes a detection unit 201, a control unit 202, a switching control unit 203, and a switching unit 204. The switch 2 operates using power from a grid power supply CS or a distributed power supply DS as its operating power source.

[0104] The switching control mechanism 211b includes a heart cam mechanism 216 and a return spring 215 (see Figure 4), as shown in Figures 11 and 12.

[0105] The heart cam mechanism 216 includes a base member 2161, a movable shaft 2162, a moving member 218, and a spring 226.

[0106] The base member 2161 has a circular plate shape when viewed from the front. The base member 2161 is fixed to the case 20 of the switch 2. A movement restricting part 217 is provided on one side (front) of the base member 2161. The movable shaft 2162 has a circular column shape when viewed from the front. The movable shaft 2162 is configured to be rotatable relative to the base member 2161. The movable member 218 is a long rod in one direction and has a first end and a second end. The first end of the movable member 218 is attached to the movable shaft 2162 in a manner that allows it to rotate relative to the movable shaft 2162. The second end of the movable member 218 is fitted into the movement restricting part 217. The first end of the spring 226 is attached to the second end of the movable member 218, and the second end of the spring 226 is attached to the movable shaft 2162. The spring 226 applies an elastic force to the second end of the moving member 218 in a direction toward the center of the movable axis 2162.

[0107] The movement restricting section 217 is formed in a heart shape. The movement restricting section 217 includes a first restricting section 217a, a second restricting section 217b, a third restricting section 217c, and a fourth restricting section 217d.

[0108] The first regulating section 217a is formed to rise linearly in one direction (to the right in Figure 11) from the endpoint 217e.

[0109] The second restricting section 217b is connected to one of the ends of the first restricting section 217a, but to an end other than the endpoint 217e. The second restricting section 217b is formed to descend from the connection point between the first restricting section 217a and the second restricting section 217b in the opposite direction to the one direction mentioned above (to the left in Figure 11). A step (first step) is provided at the connection point between the first restricting section 217a and the second restricting section 217b. Due to the first step, the second end of the movable member 218 can move from the first restricting section 217a to the second restricting section 217b, but cannot move from the second restricting section 217b to the first restricting section 217a.

[0110] The third restricting section 217c is connected to one end of the second restricting section 217b that is different from the end connected to the first restricting section 217a. The third restricting section 217c is formed to descend in the opposite direction from the connection point between the second restricting section 217b and the third restricting section 217c. A step (second step) is provided at the connection point between the second restricting section 217b and the third restricting section 217c. Due to the second step, the second end of the movable member 218 can move from the second restricting section 217b to the third restricting section 217c, but cannot move from the third restricting section 217c to the second restricting section 217b.

[0111] The fourth restricting section 217d is connected to one end of the third restricting section 217c that is different from the end connected to the second restricting section 217b. The fourth restricting section 217d is formed to be a straight line along the opposite direction from the connection point between the third restricting section 217c and the fourth restricting section 217d, and then is formed to descend along the opposite direction. A step (third step) is provided at the connection point between the third restricting section 217c and the fourth restricting section 217d. The second end of the movable member 218 can move from the third restricting section 217c to the fourth restricting section 217d, but cannot move from the fourth restricting section 217d to the third restricting section 217c due to the third step. In addition, the end of the fourth restricting section 217d that is different from the end connected to the third restricting section 217c is connected to the first restricting section 217a. A step (fourth step) is provided at the connection point between the fourth restricting section 217d and the first restricting section 217a. Due to the fourth step, the second end of the movable member 218 can move from the fourth restricting section 217d to the first restricting section 217a, but it cannot move from the first restricting section 217a to the fourth restricting section 217d.

[0112] In other words, the heart cam mechanism 216 allows the second end of the movable member 218 to move in the order of the first restricting part 217a, the second restricting part 217b, the third restricting part 217c, and the fourth restricting part 217d, and prevents movement in the reverse order. To put it another way, the heart cam mechanism 216 restricts the movement of the movable member 218 in the order of the first restricting part 217a, the second restricting part 217b, the third restricting part 217c, and the fourth restricting part 217d.

[0113] As shown in Figures 13 and 14, the switching unit 204 includes a first terminal 221, a second terminal 222, and a switching mechanism 220. The first terminal 221 is connected to the grid power supply CS. The second terminal 222 is connected to the distributed power supply DS. The switching mechanism 220 includes a third terminal 223 connected to the load L1, and switches the connection destination of the third terminal 223 between the first terminal 221 and the second terminal 222 using a butt-type contact connection.

[0114] The switching unit 204 is provided with three first terminals 221 (first terminals 221a, 221b, and 221c). Note that in Figures 13 and 14, only terminal 221b of the three first terminals 221 is shown.

[0115] The first terminal 221a is electrically connected to the first input terminal 21a. That is, the first terminal 221a is electrically connected to the secondary terminal 12a of the main circuit breaker 1 via the first input terminal 21a. The first terminal 221b is electrically connected to the first input terminal 21b. That is, the first terminal 221b is electrically connected to the secondary terminal 12b of the main circuit breaker 1 via the first input terminal 21b. The first terminal 221c is electrically connected to the first input terminal 21c. That is, the first terminal 221c is electrically connected to the secondary terminal 12c of the main circuit breaker 1 via the first input terminal 21c.

[0116] The switching unit 204 is provided with three second terminals 222 (second terminals 222a, 222b, and 222c). Note that in Figures 13 and 14, only terminal 222b of the three second terminals 222 is shown.

[0117] The second terminal 222a is electrically connected to the second input terminal 23a. That is, the second terminal 222a is connected to the power line of the first voltage pole (L1 phase) of wire W3 via the second input terminal 23a. The second terminal 222b is electrically connected to the second input terminal 23b. That is, the second terminal 222b is connected to the power line of the second voltage pole (L2 phase) of wire W3 via the second input terminal 23b. The second terminal 222c is electrically connected to the second input terminal 23c. That is, the second terminal 222c is connected to the power line of the neutral pole (N phase) of wire W3 via the second input terminal 23c.

[0118] The switching mechanism 220 is provided with three third terminals 223 (third terminals 223a, 223b, and 223c). Note that in Figures 13 and 14, only the third terminal 223b is shown among the three third terminals 223.

[0119] The third terminal 223 has a first end and a second end. The first end of the third terminal 223 is electrically connected to the output terminal 22. More specifically, the first end of the third terminal 223a is electrically connected to the output terminal 22a. The first end of the third terminal 223b is electrically connected to the output terminal 22b. The first end of the third terminal 223c is electrically connected to the output terminal 22c.

[0120] The second end of the third terminal 223 is selectively connected to either the first terminal 221 or the second terminal 222. More specifically, the second end of the third terminal 223a is selectively connected to either the first terminal 221a or the second terminal 222a. The second end of the third terminal 223b is selectively connected to either the first terminal 221b or the second terminal 222b. The second end of the third terminal 223c is selectively connected to either the first terminal 221c or the second terminal 222c.

[0121] Each of the third terminals 223 of the switching mechanism 220 is configured to rotate in accordance with the rotation of the movable shaft 2162 of the heart cam mechanism 216. The third terminal 223 has a pair of shaft portions 227. Specifically, the third terminal 223a has a pair of shaft portions 227a that protrude in one direction (a direction perpendicular to the plane of the paper in Figure 13). The third terminal 223b has a pair of shaft portions 227b that protrude in the same direction. The third terminal 223c has a pair of shaft portions 227c that protrude in the same direction. The third terminal 223a rotates around the pair of shaft portions 227a as the axis of rotation in accordance with the rotation of the movable shaft 2162. The third terminal 223b rotates around the pair of shaft portions 227b as the axis of rotation in accordance with the rotation of the movable shaft 2162. The third terminal 223c rotates around the pair of shaft portions 227c as the axis of rotation in accordance with the rotation of the movable shaft 2162.

[0122] Here, the contact surfaces of the first terminal 221 and the second terminal 222 with the third terminal 223 are provided along a direction intersecting the rotational direction of the third terminal 223. That is, the first terminal 221 and the second terminal 222 are provided such that their respective width directions are aligned along this one direction. As a result, when the third terminal 223 rotates, it selectively abuts and contacts either the first terminal 221 or the second terminal 222. The width directions of the first terminal 221 and the second terminal 222 are perpendicular to both the longitudinal direction and the thickness direction of the first terminal 221 and the second terminal 222, respectively.

[0123] The switching mechanism 220 further includes a toggle mechanism 219. The switching mechanism 220 is provided with three toggle mechanisms 219. The three toggle mechanisms 219 correspond one-to-one with the three third terminals 223.

[0124] The toggle mechanism 219 is provided at the second end of the third terminal 223. The toggle mechanism 219 increases the rotational force of the third terminal 223 generated by the rotation of the movable shaft 2162, thereby allowing the third terminal 223 to selectively contact either the first terminal 221 or the second terminal 222 more quickly. Furthermore, by using the toggle mechanism 219, it is possible to stabilize the connection between the third terminal 223 and the terminal to which the third terminal 223 is connected.

[0125] (2) Operation of the switch (2.1) First action This section describes the operation of switch 2 in which it switches the power supply to load L1 from grid power supply CS to distributed power supply DS.

[0126] When the power supply to load L1 is the grid power supply CS, the third terminal 223 is electrically connected to the first terminal 221 (see Figure 13). In this case, the second end of the movable member 218 of the switch 2 is located at the third restricting section 217c, as shown in Figure 11.

[0127] If the detection unit 201 determines, based on its detection results, that it should switch the connection destination of load L1 from grid power supply CS to distributed power supply DS, the control unit 202 drives the actuator 210. For example, if the detection unit 201 determines, based on the first voltage it detects, that the power supply state from grid power supply CS has switched from a first state to a second state, the control unit 202 drives the actuator 210. More specifically, the control unit 202 supplies power from the distributed power supply DS to the actuator 210.

[0128] When the actuator 210 is driven, the movable shaft 2162 rotates along the first direction D1. The second end of the moving member 218 moves within the movement restricting section 217 as the movable shaft 2162 rotates. Specifically, since the second end of the moving member 218 is unable to move from the third restricting section 217c to the second restricting section 217b, it moves from the third restricting section 217c to the fourth restricting section 217d.

[0129] When the control unit 202 stops driving the actuator 210, that is, when the control unit 202 stops supplying power from the distributed power supply DS to the actuator 210, the movable shaft 2162 rotates along the second direction D2 due to the elastic force of the return spring 215. The moving member 218 moves within the movement restricting section 217 as the movable shaft 2162 rotates. At this time, the moving member 218 moves from the fourth restricting section 217d to the first restricting section 217a and reaches the endpoint 217e (see Figure 12).

[0130] Furthermore, the third terminal 223 rotates around the shaft portion 227 as the axis of rotation in accordance with the rotation of the movable shaft 2162. When the movable shaft 2162 rotates along the second direction D2, which is the opposite direction to the first direction D1, the third terminal 223 rotates around the shaft portion 227 as the axis of rotation, moving from the first terminal 221 to the second terminal 222. In the example in Figure 13, when the movable shaft 2162 rotates along the second direction D2, the third terminal 223 rotates counterclockwise (leftward) around the shaft portion 227 as the axis of rotation.

[0131] When the third terminal 223 rotates from the first terminal 221 towards the second terminal 222, the third terminal 223 becomes disconnected from the first terminal 221 and connects to the second terminal 222. At this time, the toggle mechanism 219 quickly connects the third terminal 223 to the second terminal 222 after it has become disconnected from the first terminal 221. Furthermore, by using the toggle mechanism 219, it is possible to stabilize the connection between the third terminal 223 and the second terminal 222.

[0132] (2.2)Second operation This section describes the operation in which switch 2 switches the power supply to load L1 from the distributed power supply DS to the grid power supply CS.

[0133] When the power supply providing power to the load L1 is a distributed power supply DS, the third terminal 223 is electrically connected to the second terminal 222 (see Figure 14). In this case, the second end of the movable member 218 of the switch 2 is located at the endpoint 217e of the first restricting section 217a, as shown in Figure 12.

[0134] If the detection unit 201 determines, based on its detection results, that it should switch the connection destination of load L1 from the distributed power supply DS to the grid power supply CS, the control unit 202 drives the actuator 210. For example, if the detection unit 201 determines, based on the first voltage it detects, that the power supply state from the grid power supply CS has switched from the second state to the first state, the control unit 202 drives the actuator 210. More specifically, the control unit 202 supplies power from the grid power supply CS to the actuator 210.

[0135] When the actuator 210 is driven, the movable shaft 2162 rotates along the first direction D1. The second end of the moving member 218 moves within the movement restricting section 217 as the movable shaft 2162 rotates. Specifically, since the second end of the moving member 218 is prevented from moving from the first restricting section 217a to the fourth restricting section 217d, it moves along the first restricting section 217a and reaches the second restricting section 217b.

[0136] When the control unit 202 stops driving the actuator 210, that is, when the control unit 202 stops supplying power from the grid power supply CS to the actuator 210, the movable shaft 2162 rotates along the second direction D2 due to the elastic force of the return spring 215. The second end of the movable member 218 moves within the movement restricting section 217 as the movable shaft 2162 rotates. Specifically, the second end of the movable member 218 moves from the second restricting section 217b to the third restricting section 217c.

[0137] Furthermore, the third terminal 223 rotates around the shaft portion 227 as the axis of rotation in accordance with the rotation of the movable shaft 2162. When the movable shaft 2162 rotates along the first direction D1, the third terminal 223 rotates around the shaft portion 227 as the axis of rotation, moving from the second terminal 222 towards the first terminal 221. In the example in Figure 14, when the movable shaft 2162 rotates along the first direction D1, the third terminal 223 rotates clockwise (right-hand) around the shaft portion 227 as the axis of rotation.

[0138] When the third terminal 223 rotates from the second terminal 222 towards the first terminal 221, the third terminal 223 becomes disconnected from the second terminal 222 and connects to the first terminal 221. At this time, the toggle mechanism 219 quickly connects the third terminal 223 to the first terminal 221 after it has become disconnected from the second terminal 222. Furthermore, by using the toggle mechanism 219, it is possible to stabilize the connection between the third terminal 223 and the first terminal 221.

[0139] In the power switching system 2a according to Embodiment 2, similar to the power switching system 2a according to Embodiment 1, it is possible to switch between grid power supply CS and distributed power supply DS using a method different from the conventional method.

[0140] (3) Variant The following are examples of modifications. The modifications described below can be applied in appropriate combination with Embodiment 2.

[0141] (3.1) Variation 1 In Embodiment 2, the switching mechanism 220 switches the connection destination of the third terminal 223 between the first terminal 221 and the second terminal 222 by a butt-type contact connection. Alternatively, the switching mechanism 220 may switch the connection destination of the third terminal 223 between the first terminal 221 and the second terminal 222 by a sliding-type contact connection.

[0142] The switching mechanism 220 is provided with a pair of shaft portions 227 on both sides of the third terminal 223 in the thickness direction. The third terminal 223 rotates with the shaft portions 227 as its axis of rotation.

[0143] Here, the contact surfaces of the first terminal 221 and the second terminal 222 with the third terminal 223 are provided along the rotational direction of the third terminal 223. That is, the width directions of the first terminal 221 and the second terminal 222 are provided along the rotational direction of the third terminal 223. As a result, when the third terminal 223 rotates, it selectively slides and contacts either the first terminal 221 or the second terminal 222.

[0144] In the example shown in Figure 15, the third terminal 223 is electrically connected to the first terminal 221. That is, the grid power supply CS is selected as the power source to supply power to the load L1. In this case, the second end of the movable member 218 of the switch 2 is located at the third restricting section 217c (see Figure 11), similar to Embodiment 2.

[0145] In the state shown in Figure 15, when the power supply to load L1 is switched from grid power supply CS to distributed power supply DS, the movable shaft 2162 rotates along the first direction D1 due to the rotational force of actuator 210. Subsequently, when actuator 210 stops, the movable shaft 2162 rotates along the second direction D2 due to the elastic force of the return spring 215, and the second end of the movable member 218 is positioned at endpoint 217e (see Figure 12).

[0146] As the movable shaft 2162 rotates along the second direction D2, the third terminal 223 rotates around the shaft portion 227 as the axis of rotation, moving from the first terminal 221 to the second terminal 222. In the example in Figure 15, as the movable shaft 2162 rotates along the second direction D2, the third terminal 223 rotates counterclockwise (leftward) around the shaft portion 227 as the axis of rotation. When the third terminal 223 rotates from the first terminal 221 to the second terminal 222, the third terminal 223 becomes disconnected from the first terminal 221 and comes into contact with the second terminal 222 by sliding. As a result, the third terminal 223 is electrically connected to the second terminal 222 (see Figure 16). Consequently, the distributed power supply DS is selected as the power source to supply power to the load L1.

[0147] In the state shown in Figure 16, when switching the power supply to load L1 from the distributed power supply DS to the grid power supply CS, the movable shaft 2162 rotates along the first direction D1 due to the rotational force of the actuator 210. Subsequently, when the actuator 210 stops, the movable shaft 2162 rotates along the second direction D2 due to the elastic force of the return spring 215, and the second end of the moving member 218 is positioned at the third restricting portion 217c (see Figure 11).

[0148] As the movable shaft 2162 rotates along the first direction D1, the third terminal 223 rotates around the shaft portion 227 as the axis of rotation, moving from the second terminal 222 towards the first terminal 221. In the example in Figure 16, as the movable shaft 2162 rotates along the first direction D1, the third terminal 223 rotates clockwise (right-hand) around the shaft portion 227 as the axis of rotation. When the third terminal 223 rotates from the second terminal 222 towards the first terminal 221, it becomes disconnected from the second terminal 222 and comes into contact with the first terminal 221 by sliding. As a result, the third terminal 223 is electrically connected to the first terminal 221 (see Figure 15). Consequently, the grid power supply CS is selected as the power source to supply power to the load L1.

[0149] In other words, the switching unit 204 according to modified example 1 has a first terminal 221, a second terminal 222, and a switching mechanism 220. The first terminal 221 is connected to the grid power supply CS. The second terminal 222 is connected to the distributed power supply DS. The switching mechanism 220 includes a third terminal 223 connected to the load L1, and switches the connection destination of the third terminal 223 between the first terminal 221 and the second terminal 222 by a sliding contact connection.

[0150] (3.2) Variation 2 In Embodiment 2, the switching unit 204 switches the connection state between a first connection state in which the grid power supply CS and the load L1 are electrically connected and a second connection state in which the distributed power supply DS and the load L1 are electrically connected. Alternatively, the switching unit 204 may switch the connection state to one of the following: the first connection state, the second connection state, or a neutral state in which it is not electrically connected to either the grid power supply CS or the distributed power supply DS.

[0151] In modified example 2, the heart cam mechanism 216a is configured to control the switching of the connection state by the switching unit 204 so that the connection state is one of the first connection state, the second connection state, or the neutral state.

[0152] A movement restricting portion 314 is provided on one surface of the base member 2161 of the heart cam mechanism 216a. The movement restricting portion 314 is a groove into which the second end of the movable member 218, which is attached to the movable shaft 2162, is fitted. The movement restricting portion 314 includes a first restricting portion 314a, a second restricting portion 314b, a third restricting portion 314c, a fourth restricting portion 314d, a fifth restricting portion 314e, a sixth restricting portion 314f, and a seventh restricting portion 314g.

[0153] The first regulating section 314a is formed to rise in one direction (to the right in Figure 17) from the endpoint 314h, and then descend.

[0154] The second restricting section 314b is connected to one of the ends of the first restricting section 314a, but to an end other than the endpoint 314h. The second restricting section 314b is formed to descend from the connection point between the first restricting section 314a and the second restricting section 314b in the opposite direction to the one direction mentioned above (to the left in Figure 17). A step (first step) is provided at the connection point between the first restricting section 314a and the second restricting section 314b. Due to the first step, the second end of the movable member 218 can move from the first restricting section 314a to the second restricting section 314b, but cannot move from the second restricting section 314b to the first restricting section 314a.

[0155] The third restricting section 314c is connected to one end of the second restricting section 314b that is different from the end where it connects to the first restricting section 314a. The third restricting section 314c is formed to descend in the same direction from the connection point between the second restricting section 314b and the third restricting section 314c. A step (second step) is provided at the connection point between the second restricting section 314b and the third restricting section 314c. Due to the second step, the second end of the movable member 218 can move from the second restricting section 314b to the third restricting section 314c, but cannot move from the third restricting section 314c to the second restricting section 314b.

[0156] The fourth restricting section 314d is connected to one end of the third restricting section 314c that is different from the end where it connects to the second restricting section 314b. The fourth restricting section 314d is formed to descend in the opposite direction from the connection point between the third restricting section 314c and the fourth restricting section 314d. A step (third step) is provided at the connection point between the third restricting section 314c and the fourth restricting section 314d. Due to the third step, the second end of the movable member 218 can move from the third restricting section 314c to the fourth restricting section 314d, but cannot move from the fourth restricting section 314d to the third restricting section 314c.

[0157] The fifth restricting section 314e is connected to one end of the fourth restricting section 314d that is different from the end connected to the third restricting section 314c. The fifth restricting section 314e is formed to descend in the opposite direction from the connection point between the fourth restricting section 314d and the fifth restricting section 314e. A step (fourth step) is provided at the connection point between the fourth restricting section 314d and the fifth restricting section 314e. Due to the fourth step, the second end of the movable member 218 can move from the fourth restricting section 314d to the fifth restricting section 314e, but cannot move from the fifth restricting section 314e to the fourth restricting section 314d.

[0158] The sixth restrictor 314f is connected to one end of the fifth restrictor 314e that is different from the end connected to the fourth restrictor 314d. The sixth restrictor 314f is formed to descend in the same direction as described above from the connection point between the fifth restrictor 314e and the sixth restrictor 314f. A step (fifth step) is provided at the connection point between the fifth restrictor 314e and the sixth restrictor 314f. Due to the fifth step, the second end of the movable member 218 can move from the fifth restrictor 314e to the sixth restrictor 314f, but cannot move from the sixth restrictor 314f to the fifth restrictor 314e.

[0159] The seventh restricting section 314g is connected to one end of the sixth restricting section 314f that is different from the end connected to the fifth restricting section 314e. The seventh restricting section 314g is formed to be a straight line along the opposite direction from the connection point between the sixth restricting section 314f and the seventh restricting section 314g, and then is formed to rise along the same direction. A step (sixth step) is provided at the connection point between the sixth restricting section 314f and the seventh restricting section 314g. The second end of the movable member 218 can move from the sixth restricting section 314f to the seventh restricting section 314g, but cannot move from the seventh restricting section 314g to the sixth restricting section 314f due to the sixth step. In addition, one end of the seventh restricting section 314g that is different from the end connected to the sixth restricting section 314f is connected to the first restricting section 314a. A step (the seventh step) is provided at the connection point between the seventh restricting section 314g and the first restricting section 314a. The second end of the movable member 218 can move from the seventh restricting section 314g to the first restricting section 314a, but it cannot move from the first restricting section 314a to the seventh restricting section 314g due to the seventh step.

[0160] In other words, the heart cam mechanism 216a restricts the movement of the second end of the movable member 218 in the order of the first restricting part 314a, second restricting part 314b, third restricting part 314c, fourth restricting part 314d, fifth restricting part 314e, sixth restricting part 314f, and seventh restricting part 314g by the movement restricting part 314, and prevents movement in the reverse order. To put it another way, the heart cam mechanism 216a restricts the movement of the second end of the movable member 218 in the order of the first restricting part 314a, second restricting part 314b, third restricting part 314c, fourth restricting part 314d, fifth restricting part 314e, sixth restricting part 314f, and seventh restricting part 314g by the movement restricting part 314.

[0161] In the modified example 2, when the second end of the movable member 218 is located at endpoint 314h, the third terminal 233 is connected to the second terminal 222 (see Figure 14). When the second end of the movable member 218 is located at the third restricting portion 314c, the third terminal 233 is in a neutral state, not connected to either the first terminal 221 or the second terminal 222 (see Figure 18). When the second end of the movable member 218 is located at the fourth restricting portion 314d, the third terminal 233 is connected to the first terminal 221 (see Figure 13). When the second end of the movable member 218 is located at the sixth restricting portion 314f, the third terminal 233 is in a neutral state (see Figure 18).

[0162] In other words, the switching control mechanism 211c (see Figure 17) according to Modification 2 controls the switching of the connection state by the switching unit 204 so that the connection state becomes the first connection state, the second connection state, or the neutral state. The neutral state is a state in which there is no electrical connection to either the grid power supply CS or the distributed power supply DS.

[0163] (3.3) Modification example 3 In the modified example 2, instead of setting the third terminal 223 to a neutral state, the third terminal 223 may be connected to a distributed power supply DS1 that is different from the distributed power supply DS.

[0164] The switching unit 204 according to the modified example 3 has a fourth terminal 225 that is electrically connected to the distributed power supply DS1. The switching unit 204 is provided with three fourth terminals 225. The three fourth terminals 225 correspond one-to-one with the three third terminals 223. Each of the three third terminals 223 is connected to the corresponding fourth terminal 225 in accordance with the rotation of the movable shaft 2162.

[0165] Of the three fourth terminals 225, the first fourth terminal 225 is connected to the power line of the first voltage pole (L1 phase) of the wire connected to the distributed power supply DS1. The second fourth terminal 225 is connected to the power line of the second voltage pole (L2 phase) of the wire connected to the distributed power supply DS1. The third fourth terminal 225 is connected to the power line of the neutral pole (N phase) of the wire connected to the distributed power supply DS1.

[0166] When the second end of the movable member 218 is located at the third restricting section 314c or the sixth restricting section 314f shown in Figure 17, the third terminal 233 is connected to the fourth terminal 225 (see Figure 19).

[0167] In this case, it is preferable that the switching mechanism 220 selectively switches the connection destination of the third terminal 223 to one of the first terminal 221, the second terminal 222, or the fourth terminal 225 by contact connection using a sliding method, as shown in Figure 19.

[0168] In other words, the switching control mechanism 211c (see Figure 17) according to Modification 3 controls the switching of the connection state by the switching unit 204 so that the connection state becomes the first connection state, the second connection state, or the third connection state. The third connection state is a state in which the load L1 is electrically connected to a distributed power supply DS1 that is separate from the distributed power supply DS.

[0169] (3.4) Modification 4 In Embodiment 2, the switch 2 is located between the main circuit breaker 1 and the branch circuit breaker 4. Alternatively, the switch 2 may be located downstream of the branch circuit breaker 4.

[0170] In this case, the first input terminal 21 of the switch 2 is electrically connected to the main circuit breaker 1. The output terminal 22 of the switch 2 is electrically connected to a branch circuit breaker other than the branch circuit breaker 4, to which a specific load L1 is connected. This makes it possible to supply power to a specific load L1 when the power supply to the load is switched from the grid power supply CS to the distributed power supply DS.

[0171] (3.5) Modification 5 In Embodiment 2, the switch 2 switches the power supply to the load L1 between the grid power supply CS and the distributed power supply DS. Alternatively, the switch 2 may switch the power supply to the load L1 between the distributed power supply DS and a distributed power supply different from the distributed power supply DS.

[0172] (3.6) Modification 6 It is not essential for the power switching system 2a (switch 2) to have multiple functions integrated into a single enclosure (case 20), and the components of the power switching system 2a may be distributed across multiple enclosures.

[0173] (summary) As described above, the power switching system (2a) according to the first embodiment comprises a switching unit (204), a switching control unit (203), and a control unit (202). The switching unit (204) switches the power supply to the load (L1) between at least the grid power supply (CS) and the distributed power supply (DS). The switching control unit (203) controls the switching of the power supply by the switching unit (204). The control unit (202) controls the switching control unit (203) according to the power supply status from at least the grid power supply (CS) among the grid power supply (CS) and the distributed power supply (DS). The switching unit (204) switches the connection state between at least a first connection state and a second connection state. The first connection state is a state in which the grid power supply (CS) and the load (L1) are electrically connected. The second connection state is a state in which the distributed power supply (DS) and the load (L1) are electrically connected. The switching control unit (203) includes an actuator (210) and switching control mechanisms (211; 211a; 211b; 211c). The actuator (210) generates rotational force. The switching control mechanisms (211; 211a; 211b; 211c) use the rotational force of the actuator (210) to control the switching of the connection state by the switching unit (204).

[0174] According to this embodiment, the switching control mechanism (211; 211a; 211b; 211c) controls the switching of the connection state by the switching unit (204) using the rotational force of the actuator (210). Therefore, it is possible to switch between grid power supply CS and distributed power supply DS using a method different from the conventional method.

[0175] In the power switching system (2a) according to the second embodiment, the switching control mechanism (211) includes a clutch mechanism (213) and a return spring (215).

[0176] According to this embodiment, the switching of the connection state by the switching unit (204) is controlled using a clutch mechanism (213) and a return spring (215). Therefore, it is possible to switch between grid power (CS) and distributed power (DS) using a method different from the conventional method.

[0177] In the third embodiment of the power switching system (2a), in the first embodiment, the switching control mechanism (211a) includes a ratchet mechanism (214) and a return spring (215).

[0178] According to this embodiment, a ratchet mechanism (214) and a return spring (215) are used to control the switching of the connection state by the switching unit (204). Therefore, it is possible to switch between grid power (CS) and distributed power (DS) using a method different from conventional methods.

[0179] In the power switching system (2a) according to the fourth embodiment, in the second or third embodiment, the switching unit (204) has a first terminal (221), a second terminal (222), a third terminal (223), and a switching mechanism (220). The first terminal (221) is connected to the grid power supply (CS). The second terminal (222) is connected to the distributed power supply (DS). The third terminal (223) is connected to the load (L1). The switching mechanism (220) switches the connection destination of the third terminal (223) between the first terminal (221) and the second terminal (222) by a sliding contact connection.

[0180] According to this embodiment, the connection destination of the third terminal (223) can be switched by contact connection using a sliding method.

[0181] In the power switching system (2a) according to the fifth embodiment, in the first embodiment, the switching control mechanism (211b) includes a heart cam mechanism (216; 216a) and a return spring (215).

[0182] According to this embodiment, the switching of the connection state by the switching unit (204) is controlled using a heart cam mechanism (216; 216a) and a return spring (215). Therefore, it is possible to switch between grid power (CS) and distributed power (DS) using a method different from the conventional method.

[0183] In the power switching system (2a) according to the sixth embodiment, in the fifth embodiment, the switching unit (204) has a first terminal (221), a second terminal (222), and a switching mechanism (220). The first terminal (221) is connected to a grid power supply (CS). The second terminal (222) is connected to a distributed power supply (DS). The switching mechanism (220) includes a third terminal (223) connected to a load (L1), and switches the connection destination of the third terminal (223) between the first terminal (221) and the second terminal (222) by a butt-type contact connection.

[0184] According to this embodiment, the connection destination of the third terminal (223) can be switched by a butt joint type contact connection.

[0185] In the power switching system (2a) according to the seventh embodiment, the switching mechanism (220) further includes a toggle mechanism (219) in the sixth embodiment.

[0186] According to this embodiment, it becomes possible to quickly switch the connection destination of the third terminal (223), and to stabilize the connection between the third terminal (223) and the terminal to which the third terminal (223) is connected.

[0187] In the power switching system (2a) according to the eighth embodiment, in the fifth embodiment, the switching unit (204) has a first terminal (221), a second terminal (222), and a switching mechanism (220). The first terminal (221) is connected to a grid power supply (CS). The second terminal (222) is connected to a distributed power supply (DS). The switching mechanism (220) includes a third terminal (223) connected to a load (L1), and switches the connection destination of the third terminal (223) between the first terminal (221) and the second terminal (222) by a sliding contact connection.

[0188] According to this embodiment, the connection destination of the third terminal (223) can be switched by contact connection using a sliding method.

[0189] In the power switching system (2a) according to the ninth embodiment, in any one of the first to eighth embodiments, the switching control mechanism (211c) controls the switching of the connection state by the switching unit (204) so ​​that the connection state is the first connection state, the second connection state, or the neutral state. The neutral state is a state in which there is no electrical connection to either the grid power supply (CS) or the distributed power supply (DS).

[0190] According to this embodiment, it is possible to enter a neutral state when power cannot be supplied from either the grid power supply (CS) or the distributed power supply (DS).

[0191] In the power switching system (2a) according to the tenth embodiment, in any one of the first to eighth embodiments, the switching control mechanism (211c) controls the switching of the connection state by the switching unit (204) so ​​that the connection state becomes the first connection state, the second connection state, or the third connection state. The third connection state is a state in which a distributed power source (DS1) separate from the distributed power source (DS) and the load (L1) are electrically connected.

[0192] According to this embodiment, it becomes possible to connect to a grid power supply (CS) and a distributed power supply (DS), as well as another distributed power supply (DS1).

[0193] In the power switching system (2a) according to the 11th embodiment, in any one of the 1st to 10th embodiments, the actuator (210) is a solenoid that generates rotational force by energizing from a grid power supply (CS) or a distributed power supply (DS).

[0194] According to this embodiment, it becomes possible to switch between grid power (CS) and distributed power (DS) using a solenoid that generates rotational force.

[0195] The twelfth embodiment of the distribution board (100) comprises one of the first to eleventh embodiments of the power switching system (2a) and a cabinet (C1) housing the power switching system (2a).

[0196] According to this embodiment, it becomes possible to switch between grid power (CS) and distributed power (DS) using a method different from the conventional one.

[0197] The power supply system (200) according to the 13th embodiment comprises a power switching system (2a) according to any one of the first to 11 embodiments, and a distributed power source (DS).

[0198] According to this embodiment, it becomes possible to switch between grid power (CS) and distributed power (DS) using a method different from the conventional one.

[0199] The configurations relating to the second to eleventh aspects are not essential to the power switching system (2a) and can be omitted as appropriate. [Explanation of Symbols]

[0200] 2a Power switching system 100-unit distribution board 200 Power supply systems 202 Control Unit 203 Switching Control Unit 204 Switching section 210 Actuator 211, 211a, 211b, 211c Switching control mechanism 213 Clutch mechanism 214 Ratchet Mechanism 215 Return spring 216,216a Heartcam mechanism 219 Toggle mechanism 220 Switching mechanism 221 1st terminal 222 2nd terminal 223 3rd terminal C1 Cabinet CS Commercial power system (grid power supply) DS Distributed Power DS1 Another distributed power source L1 load

Claims

1. A switching unit that switches the power supply to the load between at least grid power and distributed power sources, A switching control unit that controls the switching of the power supply by the switching unit, The system comprises a control unit that controls the switching control unit according to the power supply status from at least the grid power supply among the grid power supply and the distributed power supply, The switching unit switches the connection state between a first connection state in which the grid power supply and the load are electrically connected and a second connection state in which the distributed power supply and the load are electrically connected. The switching control unit described above, An actuator that generates rotational force, The device includes a switching control mechanism that uses the rotational force of the actuator to control the switching of the connection state by the switching unit. Power switching system.

2. The aforementioned switching control mechanism is Clutch mechanism and, Including the return spring, The power switching system according to claim 1.

3. The aforementioned switching control mechanism is Ratchet mechanism, Including the return spring, The power switching system according to claim 1.

4. The aforementioned switching unit is A first terminal connected to the aforementioned power supply system, A second terminal connected to the aforementioned distributed power supply, A third terminal connected to the aforementioned load, The device has a switching mechanism that switches the connection destination of the third terminal between the first terminal and the second terminal by a sliding contact connection, The power switching system according to claim 2.

5. The aforementioned switching control mechanism is Heartcam mechanism, Including the return spring, The power switching system according to claim 1.

6. The aforementioned switching unit is A first terminal connected to the aforementioned power supply system, A second terminal connected to the aforementioned distributed power supply, The device includes a third terminal connected to the load, and a switching mechanism that switches the connection destination of the third terminal between the first terminal and the second terminal by a butt-type contact connection. The power switching system according to claim 5.

7. The switching mechanism further includes a toggle mechanism. The power switching system according to claim 6.

8. The aforementioned switching unit is A first terminal connected to the aforementioned power supply system, A second terminal connected to the aforementioned distributed power supply, The device includes a third terminal connected to the load, and a switching mechanism that switches the connection destination of the third terminal between the first terminal and the second terminal by a sliding contact connection. The power switching system according to claim 5.

9. The switching control mechanism controls the switching of the connection state by the switching unit so that the connection state becomes the first connection state, the second connection state, or a neutral state in which it is not electrically connected to either the grid power supply or the distributed power supply. The power switching system according to claim 1.

10. The switching control mechanism controls the switching of the connection state by the switching unit so that the connection state becomes the first connection state, the second connection state, or a third connection state in which the load is electrically connected to a distributed power source other than the distributed power source. The power switching system according to claim 1.

11. The actuator is a solenoid that generates the rotational force by energizing the system power supply or the distributed power supply. The power switching system according to claim 1.

12. A power switching system according to any one of claims 1 to 11, The system comprises a cabinet housing the aforementioned power switching system, Distribution board.

13. A power switching system according to any one of claims 1 to 11, The distributed power supply comprises, Power supply system.

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