Power switching system, distribution board, and power supply system

Abstract

The challenge presented in this disclosure is to switch between grid power and distributed power sources using a method different from conventional methods. [Solution] The power switching system 2a comprises a switching unit 204, a switching control unit 203, and a control unit 202. The switching control unit 203 controls the switching of power sources 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 source among the grid power source and distributed power sources. 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 includes 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 driving force of the actuator 210. The switching control mechanism includes a heart cam mechanism and a return spring.

Description

Technical Field

[0001] The present disclosure generally relates to a power switching system, a distribution board, and a power supply system, and more particularly to a power switching system, a distribution board, and a power supply system that switch a power source for supplying power to a load between at least a system power source and a distributed power source.

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 (see, for example, Patent Document 1).

[0003] The power source switching switch of 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.

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 method different from the conventional one is required for switching between a system power source and a distributed power source.

[0006] In view of the above problems, the present disclosure has been made, and an object thereof 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 switching control mechanism controls the switching of the connection state by the switching unit using the driving force of the actuator. The switching control mechanism comprises a heart cam mechanism and a return spring.

[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 this disclosure, it is possible to switch between grid power and distributed power sources using a method 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 one embodiment. [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]FIG. 5 is another perspective view showing the main components of the same switcher. [Figure 6] FIG. 6 is an enlarged view of the main components of the same switcher. [Figure 7] FIG. 7 is a side view explaining the main components of the same switcher when the system power supply and the load are connected. [Figure 8] FIG. 8 is a side view explaining the main components of the same switcher when the distributed power supply and the load are connected. [Figure 9] FIG. 9 is a side view explaining the main components of the switcher when the system power supply and the load are connected in Modification 1. [Figure 10] FIG. 10 is a side view explaining the main components of the switcher when the distributed power supply and the load are connected in Modification 1. [Figure 11] FIG. 11 is an enlarged view of the heart cam mechanism of the switcher in Modification 2. [Figure 12] FIG. 12 is a side view when the third terminal of the switcher is in a neutral state in Modification 2. [Figure 13] FIG. 13 is a side view when the third terminal of the switcher is connected to another distributed power supply in Modification 3.

MODE FOR CARRYING OUT THE INVENTION

[0012] The embodiments and modifications described below are merely examples of the present disclosure, and the present disclosure is not limited to the embodiments and modifications. Even outside the following embodiments and modifications, various changes can be made according to the design and the like as long as they do not depart from the technical idea of the present disclosure.

[0013] (Embodiment) Hereinafter, the power switching system 2a, the distribution board 100, and the power supply system 200 according to the present embodiment will be described with reference to FIGS. 1 to 8.

[0014] (1) Overview As shown in Figure 1, the power supply system 200 according to this embodiment is a system that supplies power supplied from a commercial power grid CS or from a distributed power source DS to a plurality of loads L1 installed within a facility. The facility is, for example, a residential facility such as a detached house or individual dwelling units in an apartment building, or a non-residential facility such as a factory, shop, office building, commercial building, hospital, or school. In this embodiment, as an example, the facility is a detached house. As shown in Figure 1, the power supply system 200 comprises a distribution board 100, a commercial power grid CS, a distributed power source DS, and a plurality of loads L1. In the following description, the commercial power grid CS will also be referred to as the grid power source CS.

[0015] The distribution board 100 is attached to a building material such as a wall, for example. As shown in FIG. 1, the distribution board 100 includes a main breaker 1, a switch 2, a plurality (three in the illustrated example) of conductive bars 3, a plurality (14 in the illustrated example) of branch breakers 4, an interconnection breaker 5, and a cabinet C1. As shown in FIGS. 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 interconnection breaker 5. The switch 2 as the power switching system 2a is a device that switches the power supplied to a plurality of loads L1 provided in the facility between the power supplied from the commercial power system CS or the power supplied from the distributed power source DS. As shown in FIG. 3, the switch 2 includes a switching unit 204, a switching control unit 203, and a control unit 202. The switching unit 204 switches the power source that supplies power to the load L1 between at least the commercial power system (system power source) CS and the distributed power source DS. The switching control unit 203 drives the switching of the power source by the switching unit 204. The control unit 202 controls the switching control unit 203 according to at least the power supply state of the power from the system power source CS among the system power source CS and the distributed power source 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 system power source CS and the load L1 are electrically connected. The second connection state is a state in which the distributed power source DS and the load L1 are electrically connected. The switching control unit 203 includes 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 driving force of the actuator 210. The switching control mechanism 211 includes a heart cam mechanism 213 (see FIG. 4) and a return spring 215 (see FIG. 4).

[0016] According to this configuration, the switching of the connection state by the switching unit 204 is controlled using the heart cam mechanism 213 and the return spring 215. Therefore, the switching between the system power source CS and the distributed power source DS can be performed by a method different from the conventional method.

[0017] (2) Configuration Next, the details of the switch 2, distribution board 100, and power supply system 200 as a power switching system 2a according to the embodiment 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 objects.

[0018] The power supply system 200 according to the embodiment is a grid connection system that can switch the power supply system to the 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 the embodiment comprises a distribution board 100, a commercial power grid CS, a distributed power source DS, and a plurality of loads L1.

[0019] (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.

[0020] 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.

[0021] 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 this embodiment includes a switch 2 and a cabinet C1 that houses the switch 2. The power supply system 200 according to this embodiment also includes a switch 2 and a distributed power supply DS.

[0022] (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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] (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.

[0027] 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 either the first input terminals 21 or the second input terminals 23 to the output terminals 22. In the following description, 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. 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. Similarly, if 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.

[0028] 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.

[0029] A conductive bar 3 is connected to output terminal 22. More specifically, conductive bar 3a (see Figures 1 and 2) of the three conductive bars 3 described later is connected to output terminal 22a. Conductive bar 3b (see Figures 1 and 2) of the three conductive bars 3 is connected to output terminal 22b. Conductive bar 3c (see Figures 1 and 2) of the three conductive bars 3 is connected to output terminal 22c.

[0030] 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 first voltage pole (L1 phase) power line of the wire W3 is connected to the second input terminal 23a. The second input terminal 23b is connected to the second voltage pole (L2 phase) power line of the wire W3. The neutral pole (N phase) power line of the wire W3 is connected to the second input terminal 23c.

[0031] 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.

[0032] 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.

[0033] Switcher 2 has, for example, a computer system having one or more processors and memory. The computer system functions as a control unit 202 by having the processor execute a program stored in 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 telecommunication line such as the Internet.

[0034] 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 status of 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.

[0035] The detection unit 201 detects 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, for example. Furthermore, the detection unit 201 detects 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, for example.

[0036] 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 status of 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 status of both the grid power supply CS and the distributed power supply DS.

[0037] The control unit 202 determines that the power supply status from the grid power source CS is powered (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 source CS is not powered (second state) if the first voltage detected by the detection unit 201 is less than or equal to the first predetermined value. The control unit 202 determines that the power supply status from the distributed power source DS is powered (third state) if the second voltage detected by the detection unit 201 is greater than a second predetermined value. The control unit 202 determines that the power supply status from the distributed power source DS is not powered (fourth state) if the second voltage detected by the detection unit 201 is less than or equal to the second predetermined value.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] The switching control unit 203 controls the switching of the power supply by the switching unit 204. The switching control unit 203 includes an actuator 210 and a switching control mechanism 211 that uses the driving force of the actuator 210 to control the switching of the connection state by the switching unit 204.

[0042] The actuator 210 generates driving force using power from the grid power supply CS or the distributed power supply DS as its operating power source. The actuator 210 is a solenoid that generates driving force in a linear unidirectional direction (hereinafter referred to as the first direction D1) when energized from the grid power supply CS or the distributed power supply DS. For example, the actuator 210 is a single-coil type push / pull solenoid.

[0043] As shown in Figure 4, the switching control mechanism 211 includes a heart cam mechanism 213 and a return spring 215. As shown in Figure 4, the switching control mechanism 211 also includes a movable body 212.

[0044] The movable body 212 is configured to move along the first direction by a driving force along the first direction D1 generated by the actuator 210. The movable body 212 has a pair of movable members 212a. Note that in Figures 4, 5, etc., only one movable member 212a is shown. The pair of movable members 212a are provided on the movable body 212 along the second direction D2, which is a direction that intersects (orthogonal to) the first direction D1. Each of the pair of movable members 212a is formed in an L shape. One end (tip) of each of the pair of movable members 212a is fitted into the heart cam mechanism 213. The other end of each of the pair of movable members 212a is pivotally supported on the movable body 212 so as to be rotatable relative to the movable body 212. As a result, each of the pair of movable members 212a is pivotally supported on the movable body 212, so that the tips of each of the pair of movable members 212a can move up and down along the movement restricting portion 214 of the heart cam mechanism 213, which will be described later.

[0045] The return spring 215 is made up of, for example, a coil spring and is provided between the moving body 212 and the heart cam mechanism 213. More specifically, the first end of the return spring 215 is connected to the moving body 212, and the second end of the return spring 215 is connected to the heart cam mechanism 213. The return spring 215 compresses when the moving body 212 moves in the first direction, generating an elastic force in the opposite direction to the first direction.

[0046] The heart cam mechanism 213 is provided with a pair of movement restricting sections 214 along the second direction D2. Note that Figure 6 shows only one movement restricting section 214.

[0047] Each pair of movement restricting sections 214 corresponds to a pair of movable members 212a. Each of the pair of movement restricting sections 214 is a groove into which the corresponding movable member 212a is fitted.

[0048] The movement restricting section 214 is formed in a heart shape. The movement restricting section 214 includes a first restricting section 214a, a second restricting section 214b, a third restricting section 214c, and a fourth restricting section 214d.

[0049] The first regulating section 214a is formed to rise along the first direction D1 from the endpoint 214e and then descend.

[0050] The second restricting section 214b is connected to one of the ends of the first restricting section 214a, but to an end other than the endpoint 214e. The second restricting section 214b is formed to descend along a direction opposite to the first direction D1 from the connection point between the first restricting section 214a and the second restricting section 214b. A step (first step) is provided at the connection point between the first restricting section 214a and the second restricting section 214b. Due to the first step, the corresponding movable member 212a can move from the first restricting section 214a to the second restricting section 214b, but cannot move from the second restricting section 214b to the first restricting section 214a.

[0051] The third restricting section 214c is connected to one end of the second restricting section 214b that is different from the end where it connects to the first restricting section 214a. The third restricting section 214c is formed to descend along the first direction D1 from the connection point between the second restricting section 214b and the third restricting section 214c. A step (second step) is provided at the connection point between the second restricting section 214b and the third restricting section 214c. Due to the second step, the corresponding movable member 212a can move from the second restricting section 214b to the third restricting section 214c, but cannot move from the third restricting section 214c to the second restricting section 214b.

[0052] The fourth restricting section 214d is connected to one end of the third restricting section 214c that is different from the end connected to the second restricting section 214b. The fourth restricting section 214d is formed to be a straight line along the direction opposite to the first direction D1 from the connection point between the third restricting section 214c and the fourth restricting section 214d, and is then formed to rise along the first direction D1. A step (third step) is provided at the connection point between the third restricting section 214c and the fourth restricting section 214d. Due to the third step, the corresponding movable member 212a can move from the third restricting section 214c to the fourth restricting section 214d, but cannot move from the fourth restricting section 214d to the third restricting section 214c. In addition, the end of the fourth restricting section 214d that is different from the end connected to the third restricting section 214c is connected to the first restricting section 214a. A step (fourth step) is provided at the connection point between the fourth restricting section 214d and the first restricting section 214a. Due to the fourth step, the corresponding movable member 212a can move from the fourth restricting section 214d to the first restricting section 214a, but cannot move from the first restricting section 214a to the fourth restricting section 214d.

[0053] In other words, the heart cam mechanism 213 allows the movable member 212a to move in the order of the first restricting part 214a, the second restricting part 214b, the third restricting part 214c, and the fourth restricting part 214d by the movement restricting part 214, and does not allow it to move in the reverse order. To put it another way, the heart cam mechanism 213 restricts the movement of the movable member 212a in the order of the first restricting part 214a, the second restricting part 214b, the third restricting part 214c, and the fourth restricting part 214d by the movement restricting part 214.

[0054] 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 and a second connection state in which the distributed power supply DS and the load L1 are electrically connected.

[0055] The switching unit 204 includes a switching mechanism 220, a first terminal 221, and a second terminal 222. 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 has 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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 butt-type contact connection.

[0061] The switching mechanism 220 is provided with three third terminals 223 (see Figure 4). When it is necessary to distinguish between the three third terminals 223, they may be referred to as third terminals 223a, 223b, and 223c.

[0062] One end of the third terminal 223 is electrically connected to the output terminal 22. More specifically, one end of the third terminal 223a is electrically connected to the output terminal 22a. One end of the third terminal 223b is electrically connected to the output terminal 22b. One end of the third terminal 223c is electrically connected to the output terminal 22c.

[0063] The other end of the third terminal 223 is selectively connected to either the first terminal 221 or the second terminal 222. More specifically, the other end of the third terminal 223a is selectively connected to either the first terminal 221a or the second terminal 222a. The other end of the third terminal 223b is selectively connected to either the first terminal 221b or the second terminal 222b. The other end of the third terminal 223c is selectively connected to either the first terminal 221c or the second terminal 222c.

[0064] Each of the third terminals 223 of the switching mechanism 220 is configured to be rotatable in accordance with the movement of the mobile body 212. The third terminal 223 has a pair of shaft portions 224. Specifically, the third terminal 223a has a pair of shaft portions 224a that protrude along the second direction D2. The third terminal 223b has a pair of shaft portions 224b that protrude along the second direction D2. The third terminal 223c has a pair of shaft portions 224c that protrude along the second direction D2. The third terminal 223a rotates around the pair of shaft portions 224a as the axis of rotation in accordance with the movement of the mobile body 212. The third terminal 223b rotates around the pair of shaft portions 224b as the axis of rotation in accordance with the movement of the mobile body 212. The third terminal 223c rotates around the pair of shaft portions 224c as the axis of rotation in accordance with the movement of the mobile body 212.

[0065] Here, the contact surfaces of the first terminal 221 and the second terminal 222 with the third terminal 223 are provided along a direction (second direction D2) that intersects the rotational direction of the third terminal 223. That is, the first terminal 221 and the second terminal 222 are provided so that their respective width directions intersect the first direction D1. As a result, when the third terminal 223 rotates, it selectively abuts and contacts either the first terminal 221 or the second terminal 222. Here, the width direction is the direction perpendicular to the longitudinal direction and thickness direction of the first terminal 221 and the second terminal 222, respectively.

[0066] The switching mechanism 220 further includes a toggle mechanism 225. The switching mechanism 220 is provided with three toggle mechanisms 225 (see Figure 5). When it is necessary to distinguish between the three toggle mechanisms 225, they may be referred to as toggle mechanisms 225a, 225b, and 225c.

[0067] The toggle mechanism 225 is provided at the tip of the third terminal 223. The tip of the third terminal 223 is a different end from the end of the third terminal 223 that is electrically connected to the output terminal 22. The toggle mechanism 225 increases the rotational force of the third terminal 223 generated in response to the movement of the movable body 212, 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 225, the connection between the third terminal 223 and the terminal to which the third terminal 223 is connected can be stabilized.

[0068] (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.

[0069] 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).

[0070] (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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] (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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] (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.

[0080] 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.

[0081] 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.

[0082] (3) Operation of the switch (3.1) First action This section describes the operation in which switch 2 switches the power supply to load L1 from grid power supply CS to distributed power supply DS.

[0083] 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 7). At this time, the tips of the pair of movable members 212a of the switch 2 are located at the third restricting section 214c (see Figure 6), as shown in Figure 7.

[0084] 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.

[0085] When the actuator 210 is driven, the moving body 212 moves along the first direction D1. As the moving body 212 moves, the pair of moving members 212a move along the first direction D1. At this time, since movement from the third restricting section 214c to the second restricting section 214b is not possible, the pair of moving members 212a move from the third restricting section 214c to the fourth restricting section 214d.

[0086] 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 moving body 212 moves along the direction opposite to the first direction D1 due to the elastic force of the return spring 215. As the moving body 212 moves, the pair of moving members 212a move along the direction opposite to the first direction D1. At this time, the pair of moving members 212a move from the fourth restricting section 214d to the first restricting section 214a. As a result, the pair of moving members 212a can move from the fourth restricting section 214d to the endpoint 214e of the first restricting section 214a.

[0087] Furthermore, the third terminal 223 rotates around the shaft portion 224 as the axis of rotation in accordance with the movement of the mobile body 212. When the mobile body 212 moves along a direction opposite to the first direction D1, the third terminal 223 rotates around the shaft portion 224 as the axis of rotation, moving from the first terminal 221 to the second terminal 222. For example, in Figure 7, when the mobile body 212 moves along a direction opposite to the first direction D1, the third terminal 223 rotates counterclockwise around the shaft portion 224 as the axis of rotation.

[0088] 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 225 quickly connects the third terminal 223 to the second terminal 222 after it has become disconnected from the first terminal 221. By using the toggle mechanism 225, the connection between the third terminal 223 and the second terminal 222 can be stabilized.

[0089] (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.

[0090] 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 (see Figure 8). In this case, the tips of the pair of movable members 212a of the switch 2 are located at the endpoint 214e of the first restricting section 214a (see Figure 6), as shown in Figure 8.

[0091] 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.

[0092] When the actuator 210 is driven, the moving body 212 moves along the first direction D1. As the moving body 212 moves, the pair of moving members 212a move along the first direction D1. At this time, since movement from the first restricting section 214a to the fourth restricting section 214d is not possible, the pair of moving members 212a move along the first restricting section 214a and reach the second restricting section 214b.

[0093] 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 moving body 212 moves along the direction opposite to the first direction D1 due to the elastic force of the return spring 215. As the moving body 212 moves, the pair of moving members 212a move along the direction opposite to the first direction D1. At this time, the pair of moving members 212a move from the second restricting section 214b to the third restricting section 214c. As a result, the pair of moving members 212a can move from the first restricting section 214a to the third restricting section 214c.

[0094] Furthermore, the third terminal 223 rotates around the shaft portion 224 as the axis of rotation in accordance with the movement of the mobile body 212. When the mobile body 212 moves along the first direction D1, the third terminal 223 rotates from the second terminal 222 towards the first terminal 221 around the shaft portion 224 as the axis of rotation. For example, in Figure 8, when the mobile body 212 moves along the first direction D1, the third terminal 223 rotates clockwise around the shaft portion 224 as the axis of rotation.

[0095] 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 225 quickly connects the third terminal 223 to the first terminal 221 after it has become disconnected from the second terminal 222. By using the toggle mechanism 225, the connection between the third terminal 223 and the first terminal 221 can be stabilized.

[0096] (4) Advantages As described above, the power switching system 2a of this 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 a switching control mechanism 211. The switching control mechanism 211 controls the switching of the connection state by the switching unit 204 using the driving force of the actuator 210. The switching control mechanism 211 includes a heart cam mechanism 213 and a return spring 215.

[0097] In this configuration, the heart cam mechanism 213 and the 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 the grid power supply CS and the distributed power supply DS using a method different from conventional methods.

[0098] (5) Variant The following are examples of modifications. These modifications can be applied in appropriate combinations with the above-described embodiments.

[0099] (5.1) Variation 1 In the above embodiment, the switching mechanism 220 is configured to switch the connection destination of the third terminal 223 between the first terminal 221 and the second terminal 222 using a butt-type contact connection. However, the configuration is not limited to this.

[0100] The switching mechanism 220 may also switch the connection destination of the third terminal 223 between the first terminal 221 and the second terminal 222 using a sliding contact connection.

[0101] The switching mechanism 220 of Modified Example 1 is provided with a pair of shaft portions 224 on both sides of the thickness direction of the third terminal 223 of Modified Example 1. The third terminal 223 of Modified Example 1 rotates around the shaft portions 224 as the axis of rotation. Here, the thickness direction of the third terminal 223 of Modified Example 1 is the direction that intersects (is perpendicular to) the first direction D1. That is, the third terminal 223 of Modified Example 1 has a pair of shaft portions 224 that protrude along the second direction D2.

[0102] 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 parallel to the first direction D1. As a result, when the third terminal 223 rotates, it selectively slides and contacts either the first terminal 221 or the second terminal 222.

[0103] In Figure 9, 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. At this time, the tips of the pair of movable members 212a of the switch 2 are located at the third restricting section 214c (see Figure 6), as in the above embodiment.

[0104] In the state shown in Figure 9, when the power supply to the load L1 is switched from the grid power supply CS to the distributed power supply DS, the movable body 212 moves along the first direction D1 due to the driving force of the actuator 210. Then, when the actuator 210 stops, the movable body 212 moves in the opposite direction to the first direction D1 due to the elastic force of the return spring 215, and the pair of movable members 212a are positioned at the endpoint 214e (see Figure 6).

[0105] When the mobile body 212 moves along a direction opposite to the first direction D1, the third terminal 223 rotates around the shaft 224 as the axis of rotation, moving from the first terminal 221 to the second terminal 222. For example, in Figure 9, when the mobile body 212 moves along a direction opposite to the first direction D1, the third terminal 223 rotates counterclockwise around the shaft 224 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 10). Consequently, the distributed power supply DS is selected as the power source to supply power to the load L1.

[0106] In the state shown in Figure 10, when the power supply to load L1 is switched from the distributed power supply DS to the grid power supply CS, the movable body 212 moves along the first direction D1 due to the driving force of the actuator 210. Then, when the actuator 210 stops, the movable body 212 moves in the opposite direction to the first direction D1 due to the elastic force of the return spring 215, and the pair of movable members 212a are positioned at the third restricting section 214c.

[0107] When the mobile body 212 moves along the first direction D1, the third terminal 223 rotates around the shaft 224 as the axis of rotation, moving from the second terminal 222 towards the first terminal 221. For example, in Figure 10, when the mobile body 212 moves along the first direction D1, the third terminal 223 rotates clockwise around the shaft 224 as the axis of rotation. 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 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 9). Consequently, the grid power supply CS is selected as the power source to supply power to the load L1.

[0108] (5.2) Variation 2 In the above embodiment, the switching unit 204 is configured to switch the connection state between a first connection state and a second connection state. However, the configuration is not limited to this.

[0109] The switching unit 204 may switch the connection state to one of the following: a first connection state, a 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.

[0110] In the modified example 2, the heart cam mechanism 213A 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.

[0111] The heart cam mechanism 213A is provided with a pair of movement restricting sections 314 along the second direction D2 (see Figure 4). Note that Figure 11 shows only one movement restricting section 314.

[0112] Each pair of movement restricting sections 314 corresponds to a pair of movable members 212a. Each of the pair of movement restricting sections 314 is a groove into which the corresponding movable member 212a is fitted.

[0113] The movement restriction section 314 includes a first restriction section 314a, a second restriction section 314b, a third restriction section 314c, a fourth restriction section 314d, a fifth restriction section 314e, a sixth restriction section 314f, and a seventh restriction section 314g.

[0114] The first regulating section 314a is formed to rise along the first direction D1 from the endpoint 314h and then descend.

[0115] 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 along a direction opposite to the first direction D1 from the connection point between the first restricting section 314a and the second restricting section 314b. 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 corresponding movable member 212a 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.

[0116] 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 along the first direction D1 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 corresponding movable member 212a 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.

[0117] 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 along a direction opposite to the first direction D1 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 corresponding movable member 212a 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.

[0118] 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 along the direction opposite to the first direction D1 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 corresponding movable member 212a 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.

[0119] 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 along the first direction D1 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 corresponding movable member 212a 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.

[0120] The seventh restrictor 314g is connected to one end of the sixth restrictor 314f that is different from the end connected to the fifth restrictor 314e. The seventh restrictor 314g is formed to be a straight line along the direction opposite to the first direction D1 from the connection point between the sixth restrictor 314f and the seventh restrictor 314g, and is then formed to rise along the first direction D1. A step (sixth step) is provided at the connection point between the sixth restrictor 314f and the seventh restrictor 314g. Due to the sixth step, the corresponding movable member 212a can move from the sixth restrictor 314f to the seventh restrictor 314g, but cannot move from the seventh restrictor 314g to the sixth restrictor 314f. In addition, the end of the seventh restrictor 314g that is different from the end connected to the sixth restrictor 314f is connected to the first restrictor 314a. A step (seventh step) is provided at the connection point between the seventh restricting section 314g and the first restricting section 214a. Due to the seventh step, the corresponding movable member 212a can move from the seventh restricting section 314g to the first restricting section 314a, but cannot move from the first restricting section 314a to the seventh restricting section 314g.

[0121] In other words, the heart cam mechanism 213A restricts the movement of the movable member 212a using the movement restricting section 314 to move in the order of the first restricting section 314a, the second restricting section 314b, the third restricting section 314c, the fourth restricting section 314d, the fifth restricting section 314e, the sixth restricting section 314f, and the seventh restricting section 314g, and prevents movement in the reverse order. To put it another way, the heart cam mechanism 213A restricts the movement of the movable member 212a using the movement restricting section 314 to move in the order of the first restricting section 314a, the second restricting section 314b, the third restricting section 314c, the fourth restricting section 314d, the fifth restricting section 314e, the sixth restricting section 314f, and the seventh restricting section 314g.

[0122] In the modified example 2, when the movable member 212a is located at the endpoint 314h, the third terminal 223 (see Figure 8) is connected to the second terminal 222 (see Figure 8). When the movable member 212a is located at the third restricting section 314c, the third terminal 223 is in a neutral state, not connected to either the first terminal 221 or the second terminal 222 (see Figure 12). When the movable member 212a is located at the fourth restricting section 314d, the third terminal 223 is connected to the first terminal 221. When the movable member 212a is located at the sixth restricting section 314f, the third terminal 223 is in a neutral state.

[0123] (5.3) Modification 3 In the modified example 2, instead of setting the third terminal 223 to a neutral state, it may be configured to be connected to a distributed power supply DS1 that is different from the distributed power supply DS.

[0124] The switching unit 204 of Modified Example 3 has a fourth terminal 226 that is electrically connected to the distributed power supply DS1 (see Figure 13). The switching unit 204 of Modified Example 3 is provided with three fourth terminals 226. The three fourth terminals 226 correspond one-to-one with the three third terminals 223. The three third terminals 223 connect to the corresponding fourth terminals 226 as the mobile body 212 moves.

[0125] Of the three fourth terminals 226, the first fourth terminal 226 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 226 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 226 is connected to the power line of the neutral pole (N phase) of the wire connected to the distributed power supply DS1.

[0126] When the tip of the movable member 212a is located at the third restricting portion 314c or the sixth restricting portion 314f shown in Figure 11, the third terminal 223 is connected to the fourth terminal 226 (see Figure 13).

[0127] 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 226 by contact connection using a sliding method, as shown in Figure 13.

[0128] In other words, the heart cam mechanism 213A of the modified example 3 (see Figure 11) controls 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 third connection state. The third connection state is a state in which the load L1 is electrically connected to a distributed power supply DS1 which is separate from the distributed power supply DS.

[0129] (5.4) Modification 4 In the above embodiment, the switch 2 is configured to be placed between the main circuit breaker 1 and the branch circuit breaker 4. However, the configuration is not limited to this.

[0130] The switch 2 may be placed downstream of the branch breaker 4. In this case, the first input terminal 21 of the switch 2 is electrically connected to the main breaker 1. The output terminal 22 of the switch 2 is electrically connected to a branch breaker other than the branch breaker 4, to which a specific load L1 is connected.

[0131] This configuration allows power to be supplied to a specific load L1 when the power source supplying the load is switched from the grid power source CS to the distributed power source DS.

[0132] (5.5) Variation 5 In the above embodiment, the switch 2 is configured to switch the power supply to the load L1 between the grid power supply CS and the distributed power supply DS. However, the configuration is not limited to this. The switch 2 may also 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.

[0133] (5.6) Variation 6 Furthermore, 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.

[0134] (summary) As described above, the power switching system (2a) of 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 a switching control mechanism (211). The switching control mechanism (211) controls the switching of the connection state by the switching unit (204) using the driving force of the actuator (210). The switching control mechanism (211) includes a heart cam mechanism (213, 213A) and a return spring (215).

[0135] According to this embodiment, the switching of the connection state by the switching unit (204) is controlled using a heart cam 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 conventional methods.

[0136] In the second embodiment of the power switching system (2a), in the first embodiment, 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). 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.

[0137] According to this embodiment, the connection destination can be switched by contact connection using a butt joint method.

[0138] In the third embodiment of the power switching system (2a), the switching mechanism (220) further comprises a toggle mechanism (225) as in the second embodiment.

[0139] According to this embodiment, the connection destination can be switched quickly. In addition, the connection between the third terminal (223) and the terminal to which the third terminal (223) is connected can be stabilized.

[0140] In the fourth embodiment of the power switching system (2a), in the first embodiment, 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 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.

[0141] According to this embodiment, the connection destination can be switched by contact connection using a sliding method.

[0142] In the fifth embodiment of the power switching system (2a), in any of the first to fourth embodiments, the heart cam mechanism (213A) controls 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. 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).

[0143] According to this embodiment, the system can be put into a neutral state when power cannot be supplied from either the grid power supply (CS) or the distributed power supply (DS).

[0144] In the sixth embodiment of the power switching system (2a), in any of the first to fourth embodiments, the heart cam mechanism (213A) controls 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 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.

[0145] According to this embodiment, in addition to grid power (CS) and distributed power (DS), it is possible to connect to another distributed power (DS1).

[0146] In the seventh embodiment of the power switching system (2a), in the first to sixth embodiments, the actuator (210) is a solenoid that generates a linear, unidirectional driving force by energizing from a grid power supply (CS) or a distributed power supply (DS).

[0147] According to this embodiment, a solenoid that generates driving force in a linear, unidirectional direction can be used to switch between grid power (CS) and distributed power (DS).

[0148] The distribution board (100) of the eighth embodiment comprises a power switching system (2a) of any of the first to seventh embodiments and a cabinet (C1) housing the power switching system (2a).

[0149] According to this embodiment, it is possible to switch between grid power (CS) and distributed power (DS) using a method different from the conventional one.

[0150] The ninth embodiment of the power supply system (200) comprises a power switching system (2a) according to any of the first to seventh embodiments and a distributed power source (DS).

[0151] According to this embodiment, it is possible to switch between grid power (CS) and distributed power (DS) using a method different from the conventional one. [Explanation of Symbols]

[0152] 2 Switch 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 Switching control mechanism 213,213A Heart Cam Mechanism 220 Switching mechanism 221,221a,221b,221c 1st terminal 222,222a,222b,222c 2nd terminal 223,223a,223b,223c 3rd terminal 225, 225a, 225b, 225c Toggle mechanism CS grid power supply (commercial power system) 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, Actuator and The device includes a switching control mechanism that uses the driving force of the actuator to control the switching of the connection state by the switching unit, The switching control mechanism includes a heart cam mechanism and a return spring. Power switching system.

2. 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 1.

3. The aforementioned switching mechanism further comprises a toggle mechanism. The power switching system according to claim 2.

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, 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 1.

5. The heartcam mechanism controls the switching of the connection state by the switching unit so that the connection state is one of 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.

6. The heartcam mechanism controls the switching of the connection state by the switching unit so that the connection state is one of 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.

7. The actuator is a solenoid that generates the driving force in a linear, unidirectional direction by energizing it from the grid power supply or the distributed power supply. The power switching system according to claim 1.

8. A power switching system according to any one of claims 1 to 7, The system comprises a cabinet housing the aforementioned power switching system, Distribution board.

9. A power switching system according to any one of claims 1 to 7, The distributed power supply comprises, Power supply system.

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