JP2024021398A - Switching unit, distribution board, and method for expanding function of distribution board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a compact switch which is suitable to be arranged in a distribution board.

SOLUTION: A switching unit (an opening-closing unit 1B) includes a housing, latching relays (33O, 33U, and 33W) of a plurality of switch types stored in the housing, a controller (40), and a first voltage monitor (511) for monitoring a voltage applied to a first line. When the switching unit detects a change of the state of the first line from a state in which the first line is being provided with a voltage to a state in which the first line is not being supplied with a voltage, the switching unit switches the state from a state in which the first line is connected to a secondary-side line to a state in which a second line is connected to a secondary-side line.

SELECTED DRAWING: Figure 3

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a switch, a distribution board to which the switch is applied, and a method for expanding functions of the distribution board.

A distribution board in which a breaker with a switching function is provided on the primary side of a main breaker has been proposed. Here, the breaker with a switching function is used to switch the input system to the main breaker.

JP2020-28200A

In the above-mentioned patent documents, the specific device configuration for realizing the switching function of a breaker with a switching function was not clear. BACKGROUND ART Conventionally, as a switch used to switch the input system to a main breaker, a switch that can be switched by manual operation of a mechanical switch such as a lever operation has been known. In addition, there has been known a switching device that is equipped with a mechanism for driving the mechanical switch in order to enable the mechanical switch to be operated manually and to achieve automatic switching without the need for human hands.

However, the latter type of switch in particular is large and poses a problem in terms of size as a switch for installation in a distribution board. Therefore, it is desired to realize a compact switching device that can be used to switch the input system to the main breaker and is suitable for being installed in a distribution board.

In order to solve the above problems, one aspect of the present invention provides a connection destination of the secondary line between a primary line and a secondary line that have a first line and a second line. , a switch to be installed in a distribution board that switches to either one of the first line and the second line, the switch including a housing and a plurality of switching type latching relays housed in the housing. , a control unit that controls the operation of the plurality of latching relays, and a first voltage monitor that monitors the voltage applied to the first line, and the control unit is configured to control the voltage applied to the first line by the first voltage monitor. When detecting a change from a state in which voltage is supplied to one line to a state in which voltage is not supplied, each of the latching relays is controlled to connect the first line to the secondary line. This is a switch that switches from a state in which the second line is connected to the secondary line to a state in which the second line is connected to the secondary line.

In order to solve the above problems, a distribution board according to one aspect of the present invention provides a distribution board that connects the secondary line between a primary line and a secondary line, each having a first line and a second line. A switching device to be installed in a distribution board that switches the connection destination of the line to either the first line or the second line, the switch including a housing and a plurality of switching types accommodated in the housing. latching relay, a control unit that controls the operation of the plurality of latching relays, and a first voltage monitor that monitors the voltage applied to the first line, the control unit including the first voltage monitor When detecting a change from a state in which voltage is being supplied to the first line to a state in which no voltage is being supplied, the controller controls each of the latching relays so that the first line is connected to the secondary side. This is a distribution board in which a switch for switching from a state in which the second line is connected to the line on the secondary side to a state in which the second line is connected to the line on the secondary side is attached to the limiter space.

In order to solve the above problems, one aspect of the present invention provides a distribution board that newly adds a module to a distribution board that includes a limiter space in which a limiter can be installed, a main breaker, and a branch breaker. In the function expansion method, between a primary line and a secondary line having a first line and a second line, the connection destination of the secondary line is changed to the first line and the second line. A switch for installing in a distribution board that switches to either one of two lines, comprising a housing, a plurality of switching type latching relays housed in the housing, and operation of the plurality of latching relays. and a first voltage monitor that monitors the voltage applied to the first line, and the control unit is configured to control the voltage applied to the first line. When it detects that the voltage has changed from the state in which the voltage is being supplied to the state in which no voltage is supplied, it controls each of the latching relays to change the state from the state in which the first line is connected to the secondary line to the state in which no voltage is supplied. This is a function expansion method of a distribution board, in which a switch for switching to a state where two lines are connected to the secondary side line is attached as the module in the limiter space.

According to one aspect of the present invention, it is possible to realize a compact switching device that can be used to switch the input system to the main breaker and is suitable for being installed in a distribution board. Alternatively, according to one aspect of the present invention, by applying the above-mentioned switching device, a distribution board with expanded functions can be realized.

FIG. 1 is a perspective view showing the appearance of a switch (switcher) according to Embodiment 1 of the present invention. 1 is a diagram showing a circuit configuration of a switch according to Embodiment 1 of the present invention. 1 is a plan view of a switch according to Embodiment 1 of the present invention. FIG. 4 is a cut end view of the switch according to Embodiment 1 of the present invention at the AA position in FIG. 3, as seen from the right side direction. FIG. 4 is a cut end view of the switch according to Embodiment 1 of the present invention at the BB position in FIG. 3, as seen from the right side direction. 1 is a configuration example of a power system to which a switch according to Embodiment 1 of the present invention is applied. It is a figure for explaining operation of a latching relay of each pole in a switch concerning Embodiment 1 of the present invention. This represents the command issued by the control unit to the latching relay of each pole when the power supply from the commercial grid is stopped. It is a figure for explaining operation of a latching relay of each pole in a switch concerning Embodiment 1 of the present invention. This represents the command issued by the control unit to the latching relay of each pole when the power supply from the commercial grid is restored. It is a schematic diagram showing the electricity distribution board before applying the function expansion method of the electricity distribution board concerning Embodiment 2 of the present invention. It is a schematic diagram showing the distribution board to which the function expansion method of the distribution board concerning Embodiment 2 of the present invention is applied.

Embodiments of the present invention will be described in detail below. For convenience of explanation, components having the same functions as components (components) described in Embodiment 1 are given the same reference numerals in each subsequent embodiment, and the description thereof may not be repeated. For the sake of brevity, descriptions of known technical matters will be omitted as appropriate.

Each component, each material, and each numerical value described in this specification is merely an example unless there is a contradiction. Therefore, for example, unless there is a particular contradiction, the positional relationship and connection relationship of each component is not limited to the example shown in each figure. The shapes and dimensions (length, width, height, etc.) of the structures described in each drawing in this application do not necessarily reflect the actual shapes and dimensions, and may be changed as appropriate for clarity and simplification of the drawings. has been done.

[Embodiment 1]
<Summary and circuit configuration of switch 1B>
A switch 1B according to Embodiment 1 of the present disclosure is a switch provided on a single-phase three-wire line. The switch 1B has one set of single-phase three-wire lines, and connects two sets of primary side lines connected to the switch 1B and a secondary side line connected to the switch 1B. You can switch the connection status as follows. The switch 1B is a switch that switches the connection destination of the secondary line between a first line and a second line, which are two sets of primary lines connected to the switch 1B.

Embodiment 1 of the present disclosure will be described below with reference to the drawings. FIG. 1 is a perspective view showing the appearance of a switch 1B according to the first embodiment. As shown in FIG. 1, the switch 1B has a generally rectangular parallelepiped appearance as a whole. The housing of the switch 1B mainly includes an insert case 2, a cover case 5, and a bottom plate 6, which is not shown in FIG. 1 and will be described later.

Generally, a switch is used by being fixed so that the bottom surface is in contact with a wall surface such as a distribution board. In this specification, the direction perpendicular to the bottom surface of the switch 1B is referred to as the height direction. In addition, regarding the height direction, the side closer to the bottom of the switch 1B is expressed as "lower side" or "lower", and the side farther from the bottom is expressed as "upper" or "higher".

The cover case 5 is configured to cover the upper side of the switch 1B. Moreover, in this specification, the direction perpendicular to the height direction and perpendicular to the longitudinal direction of the switch 1B is referred to as the width direction. The side surfaces of the housing of the switch 1B that are orthogonal to the width direction are a left side surface and a right side surface. In the perspective view of FIG. 1, the right side of the housing of the switch 1B is visible.

FIG. 2 is a diagram showing an outline of the circuit configuration of the switch 1B. As shown in FIG. 2, the switch 1B includes a first primary terminal block 11, a second primary terminal block 12, a secondary terminal block 21, and three latching relays 33U, 33O, and 33W. It is equipped with The switch 1B also includes a control section 40, a first voltage monitor 511, a second voltage monitor 512, a secondary voltage monitor 52, a communication section 60, and a notification section 70.

Three latching relays 33U, 33O, and 33W are housed inside the casing of switch 1B. Moreover, each part of the control part 40, the 1st voltage monitor 511, the 2nd voltage monitor 512, the secondary side voltage monitor 52, the communication part 60, and the notification part 70 is also accommodated in the housing|casing of the switch 1B. Note that the control unit 40 and various voltage monitors may be housed inside the casing of the switch 1B, or may be placed outside the casing. For example, the control unit 40 may be externally attached to the housing of the switch 1B, and the control unit 40 may be electrically connected to the three latching relays 33U, 33O, 33W, various voltage monitors, and the like. Alternatively, the control unit 40 and various voltage monitors may be externally attached to the housing of the switch 1B, and the control unit 40 and various voltage monitors may be electrically connected to the three latching relays 33U, 33O, and 33W.

The first primary side terminal block 11 is a terminal block for connecting a first line, which is one of two sets of primary side lines connected to the switch 1B, to the switch 1B. The second primary side terminal block 12 is a terminal block for connecting the second line, which is the other of the two sets of primary side lines connected to the switch 1B, to the switch 1B. The secondary terminal block 21 is a terminal block for connecting the secondary line to the switch 1B. In other words, the switch 1B has two primary side terminal blocks for connecting two sets of primary side lines and one secondary side terminal block for connecting one set of secondary side lines. We are prepared.

Each of the first primary terminal block 11, the second primary terminal block 12, and the secondary terminal block 21 corresponds to each pole (each phase) that constitutes a single-phase three-wire line, that is, U It has three terminals for connecting to the pole, O pole (neutral pole), and W pole. The first primary terminal block 11 has a U-pole terminal 11U, an O-pole terminal 11O, and a W-pole terminal 11W. The second primary terminal block 12 has a U-pole terminal 12U, an O-pole terminal 12O, and a W-pole terminal 12W. The secondary terminal block 21 has a U-pole terminal 21U, an O-pole terminal 21O, and a W-pole terminal 21W.

Latching relay 33U is connected to terminal 11U, terminal 12U, and terminal 21U. In this case, the latching relay 33U is a switching type relay that switches the connection destination of the terminal 21U between the terminal 11U and the terminal 12U. Latching relay 33O is connected to terminal 11O, terminal 12O, and terminal 21O. In this case, the latching relay 33O is a switching type relay that switches the connection destination of the terminal 21O between the terminal 11O and the terminal 12U.

Latching relay 33W is connected to terminal 11W, terminal 12W, and terminal 21W. In this case, the latching relay 33W is a switching type relay that switches the connection destination of the terminal 21W between the terminal 11W and the terminal 12W. In this way, each of the latching relays 33U, 33O, and 33W is a so-called c-contact type relay. In this way, the latching relays 33U, 33O, and 33W are connected between the primary terminal block (the first primary terminal block 11 and the second primary terminal block 12) and the secondary terminal block 21. The open/close state of each of the three poles provided and forming the line can be switched independently as described above. That is, the control unit 40 can switch only any one of the latching relays 33U, 33O, and 33W, or can switch any one of the latching relays in conjunction with each other.

Since the switch 1B is equipped with three switching type latching relays corresponding to each pole of the single-phase three-wire line, the secondary line connected to the switch 1B is connected to the primary line. It can be completely disconnected from one side (for example, the first line). Details of the latching relay will be described later.

Further, the switch 1B does not include a mechanical switch that can be switched by manual operation such as a lever operation, and a mechanical mechanism that allows the switch to be operated automatically without human power. Instead of such a mechanism, the switch 1B is configured compactly because the control section 40 controls the latching relays 33U, 33O, and 33W to realize line switching.

The first voltage monitor 511 monitors the voltage between each pole of the first primary terminal block 11. Here, at least the first voltage monitor 511 has a function of monitoring the voltage between the U pole and the O pole and the voltage between the W pole and the O pole. The first voltage monitor 511 may further have a function of monitoring the voltage between the U pole and the W pole. Further, the first voltage monitor 511 has at least a function of monitoring whether or not a predetermined voltage is being supplied between each pole.

The second voltage monitor 512 monitors the voltage between each pole of the second primary terminal block 12. Here, at least the second voltage monitor 512 has a function of monitoring the voltage between the U pole and the O pole and the voltage between the W pole and the O pole. The second voltage monitor 512 may further have a function of monitoring the voltage between the U pole and the W pole. Further, the second voltage monitor 512 has at least a function of monitoring whether or not a predetermined voltage is being supplied between each pole.

The secondary voltage monitor 52 monitors the voltage between each pole of the secondary terminal block 21. Here, at least the secondary voltage monitor 52 has a function of monitoring the voltage between the U pole and the O pole, and the voltage between the W pole and the O pole. The secondary voltage monitor 52 may further have a function of monitoring the voltage between the U pole and the W pole. Further, the secondary voltage monitor 52 has at least a function of monitoring whether or not a predetermined voltage is being supplied between each pole.

The communication unit 60 is a functional block that communicates with external devices. The communication unit 60 may include a communication connector 61 for connecting a communication cable. The communication connector 61 may be, for example, a LAN (Local Area Network) connector. The notification unit 70 is a functional block that reports information. The notification unit 70 may include a lamp 71 that can notify the status of the switch 1B by the color of the light emitted and the lighting state. Further, the notification unit 70 may include a buzzer or the like to provide an auditory notification when an abnormality occurs.

The control unit 40 controls each of the latching relays 33U, 33O, and 33W, and also exchanges information with the first voltage monitor 511, the second voltage monitor 512, the secondary voltage monitor 52, the communication unit 60, and the notification unit 70 as appropriate. This is a functional block that performs the following operations and controls each of these parts. The control unit 40 may be configured to include, for example, a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), etc. as hardware.

<Latching relay>
The configuration of a latching relay as an electronic component that can be applied to the latching relays 33U, 33O, and 33W of the switch 1B will be described. A latching relay as an electronic component has a rectangular parallelepiped appearance, and its bottom and top surfaces are rectangular. The short sides of the rectangle on the bottom and top surfaces of the latching relay are shorter than the other sides of the rectangular parallelepiped. In other words, the latching relay has a rectangular parallelepiped appearance in which the width direction of the latching relay is narrower than in other directions.

The latching relay has a connection terminal on the bottom surface. Moreover, the latching relay has an electromagnetic coil for driving the contacts inside. Since the electromagnetic coil is a long structure in the axial direction, the electromagnetic coil is arranged inside the latching relay so that the axial direction of the electromagnetic coil is perpendicular to the width direction, which is the narrow direction of the latching relay.

Although it varies depending on the product, for example, the electromagnetic coil may be arranged so that the axial direction is perpendicular to the bottom surface of the latching relay. Alternatively, the electromagnetic coil may be arranged such that the axial direction is perpendicular to the width direction of the latching relay and is oblique to the bottom surface of the latching relay. Alternatively, the electromagnetic coil may be arranged such that the axial direction is perpendicular to the width direction of the latching relay and parallel to the bottom surface of the latching relay.

In the switch 1B, each of the latching relays 33U, 33O, and 33W is switched under the control of the control unit 40. That is, the control unit 40 has a drive circuit that drives each electromagnetic coil. The latching relay applied to the switch 1B is a relay that performs a switching operation of switching connections by applying a pulse current to an electromagnetic coil inside the latching relay.

A type of latching in which the pulse current for executing a set operation and the pulse current for executing a reset operation have different polarities (positive and negative) and have a common terminal that accepts these pulse currents (set signal, reset signal). A relay may be applied to switch 1B. A latching relay that has independent terminals (set port, reset port) that accept pulse current for executing a set operation and terminal that accepts pulse current for executing a reset operation is applied to switch 1B. may be done.

In the following, in the latching relay 33U, switching the connection destination of the terminal 21U from the terminal 12U to the terminal 11U is defined as a set operation, and switching from the terminal 11U to the terminal 12U is defined as a reset operation. In the latching relay 33O, switching the connection destination of the terminal 21O from the terminal 12O to the terminal 11O is defined as a set operation, and switching from the terminal 11O to the terminal 12O is defined as a reset operation.

Furthermore, in the latching relay 33W, switching the connection destination of the terminal 21W from the terminal 12W to the terminal 11W is defined as a set operation, and switching from the terminal 11W to the terminal 12W is defined as a reset operation. However, these regulations are illustrative in the embodiment, and may be reversed.

In each of the latching relays 33U, 33O, and 33W, it is not necessary to constantly energize the electromagnetic coil to maintain the connection state, and it is only necessary to input a pulse current (set signal, reset signal) only when switching. Therefore, since no heat is generated by the electromagnetic coil, three relays, ie, latching relays 33U, 33O, and 33W, may be housed inside the switch 1B.

<Casing structure of switch 1B>
Further, the structure of the switch 1B will be explained with reference to FIGS. 3 to 13. FIG. 3 is a plan view of the switch 1B. FIG. 3 corresponds to a view of the switch 1B viewed from above (hereinafter referred to as "plan view") according to the above definition, and the bottom surface of the switch 1B is not shown.

FIG. 4 is an end view of the cut portion viewed from the right side direction at a position indicated as AA in the plan view of FIG. FIG. 5 is an end view of the cut portion viewed from the right side direction at a position indicated as BB in the plan view of FIG. Since FIGS. 4 and 5 are end views of the cut portion, structures deeper than the cut portion are not shown.

The switch 1B includes a first primary terminal block 11 at one end in the longitudinal direction to which a first line, which is one of the primary lines, is connected. The first primary side terminal block 11 is in contact with a first short side that is a short side of the rectangular outer side of the switch 1B in a plan view (plan view of FIG. 3).

The switch 1B has a second primary terminal block 12 at the other end in the longitudinal direction for connecting the second line, which is the other side of the primary line, and a second line for connecting the secondary line. It is provided with a secondary side terminal block 21 for connection. The secondary terminal block 21 is in contact with a second short side that is a different short side from the first short side of the rectangular outer side of the switch 1B in a plan view (plan view of FIG. 3). The second primary terminal block 12 is arranged inside the secondary terminal block 21 at the end.

The main part of the housing of the switch 1B is constituted by an insert case 2. The insert case 2 constitutes a first primary terminal block 11, a second primary terminal block 12, and a secondary terminal block 21 at both longitudinal ends of the switch 1B. Further, as shown in FIG. 1, about half of the lower right side of the housing is constituted by an insert case 2. Similarly, about half of the lower left side of the housing is also constituted by the insert case 2.

As shown in FIG. 3, the insert case 2 is suitably provided with through holes 9 used for screwing and fixing the switch 1B to a wall surface of a distribution board or the like. The through hole 9 is a hole that passes through the insert case 2 in the height direction. As illustrated in FIG. 3, the through holes are formed in a pair of opposite corners of the switch 1B, for example, a wall 114 of a first primary terminal block 11, which will be described later, and a secondary terminal block 21, which will be described later. It may be provided on the wall 211 of.

Approximately half of the upper sides of the left and right sides of the casing and the top surface of the casing are constituted by the cover case 5. In the insert case 2, there is a cavity between a portion that constitutes the second primary terminal block 12 and a portion that constitutes the secondary terminal block 21. With the cover case 5 and the bottom plate 6 attached to the insert case 2, the cavity constitutes the internal space of the housing of the switch 1B.

The cover case 5 is also a member that closes the opening on the upper surface side of the cavity. The bottom plate 6 is also a member that closes the opening on the bottom side of the cavity. In addition, on the bottom surface of the housing of the switch 1B, a cover film may be used instead of the bottom plate 6 that closes the opening of the insert case 2, and the opening on the bottom surface side may be closed with the cover film.

<Details of terminal block configuration>
The first primary side terminal block 11 has a U-pole terminal 11U, an O-pole terminal 11O, and a W-pole terminal 11W in this order from the left side of the housing along the first short side. There is. In order to prevent accidental electrical contact between the terminals, a wall 112 is provided between the terminals 11U and 11O, and a wall 113 is provided between the terminals 11O and 11W. Further, a wall 111 is provided on the left side of the casing relative to the terminal 11U, and a wall 114 is provided on the right side of the casing relative to the terminal 11W.

Wall 111, wall 112, wall 113, and wall 114 are part of insert case 2, and are formed integrally with insert case 2. The walls 111, 112, 113, and 114 also serve to prevent accidents such as short circuits caused by careless contact with each terminal of the first primary terminal block 11.

The secondary terminal block 21 has a U-pole terminal 21U, an O-pole terminal 21O, and a W-pole terminal 21W in this order from the left side of the housing along the second short side. In order to prevent accidental electrical contact between the terminals, a wall 212 is provided between the terminals 21U and 21O, and a wall 213 is provided between the terminals 21O and 21W. Further, a wall 211 is provided on the left side of the housing of the terminal 21U, and a wall 214 is provided on the right side of the housing of the terminal 21W. The walls 211, 212, 213, and 214 also serve to prevent accidents such as short circuits caused by careless contact with each terminal of the secondary terminal block 21.

The second primary side terminal block 12 is located inside the secondary side terminal block 21 in plan view, and from the left side of the housing, the U-pole terminal 12U, the O-pole terminal 12O, the W-pole terminal It has terminals 12W in this order. In order to prevent accidental electrical contact between the terminals, a wall 122 is provided between the terminals 12U and 12O, and a wall 123 is provided between the terminals 12O and 12W. Further, a wall 121 is provided on the left side of the housing from the terminal 12U, and a wall 124 is provided on the right side of the housing from the terminal 12W.

Wall 121, wall 122, wall 123, and wall 124 are part of insert case 2, and are formed integrally with insert case 2. The walls 121, 122, 123, and 124 also serve to prevent accidents such as short circuits caused by careless contact with each terminal of the second primary terminal block 12.

In the height direction, each terminal (terminal 21U, terminal 21O, terminal 21W) of the secondary side terminal block 21 is higher than each terminal (terminal 12U, terminal 12O, terminal 12W) of the second primary side terminal block 12. It is located at a low position (close to the bottom). Furthermore, the highest position of each wall (wall 211, wall 212, wall 213, wall 214) of the secondary terminal block 21 is lower than each terminal of the second primary terminal block 12. It is like that. In this way, each terminal of the secondary side terminal block 21 and each terminal of the second primary side terminal block 12 are arranged apart from each other in the height direction, so that mutual contact is prevented. It is configured.

<Structure inside the casing of switch 1B>
Next, the main components among the components accommodated in the internal space defined by the insert case 2, the cover case 5, and the bottom plate 6, that is, inside the housing, will be described.

Inside the casing of the switch 1B, a first circuit board 3 is arranged along the bottom plate 6, that is, along the bottom surface of the casing. Further, inside the casing of the switch 1B, a second circuit board 4 is arranged along the main surface of the cover case 5, that is, along the top surface of the casing. The control section 40, the notification section 70, and the communication section 60 are provided on the second circuit board 4. The first voltage monitor 511, the second voltage monitor 512, and the secondary voltage monitor 52 are provided on the first circuit board 3.

The lamp 71 of the notification section 70 is arranged on the upper surface of the second circuit board 4. As shown in FIG. 3, when the cover case 5 is attached to the insert case 2, the lamp 71 of the notification section 70 on the second circuit board 4 can be viewed from the outside through the peephole made in the cover case 5. It is configured to be visible.

As shown in FIG. 5, the communication connector 61 of the communication unit 60 is arranged near the end of the second circuit board 4 on the lower surface of the second circuit board 4. As shown in FIG. In this way, the communication cable connector 61 can be connected to and removed from the communication connector 61 through the opening made in the cover case 5. Further, as shown in FIG. 5, the first circuit board 3 and the second circuit board 4 may be appropriately wired with one or more harnesses 8.

The first circuit board 3 holds three latching relays 33U, 33O, and 33W. Each latching relay 33U, 33O, 33W is fixed to the first circuit board 3 by, for example, soldering. In addition, the connection terminals of the latching relays provided on the bottom surfaces of the latching relays 33U, 33O, and 33W are soldered to the first circuit board 3, thereby connecting the wiring to each latching relay. The positions of the three latching relays 33U, 33O, and 33W in plan view are shown by dotted lines in FIG. 3.

In plan view, latching relay 33U, latching relay 33O, and latching relay 33W are arranged in this order from the left side of switch 1B. Further, the three latching relays 33U, 33O, and 33W are arranged on the first circuit board 3 so that the long sides of the rectangles on the bottom of each latching relay are arranged parallel to each other.

That is, three latching relays 33U, 33O, and 33W are arranged so as to be lined up in the respective width directions. In FIG. 4, the arrangement of the electromagnetic coil 31 of the latching relay 33U is shown by dotted lines. FIG. 4 shows an example in which the axial direction of the electromagnetic coil 31 of the latching relay is perpendicular to the bottom surface of the latching relay.

In this way, inside the housing of the switch 1B, the three latching relays 33U, 33O, and 33W are arranged in the same direction so that the electromagnetic coils 31 of each latching relay are lined up in parallel. That is, the three latching relays 33U, 33O, and 33W are arranged side by side with their orientation aligned in the width direction, which is the narrow direction of each latching relay.

As shown in the cut end views of FIGS. 4 and 5, each terminal of the first primary terminal block 11, each terminal of the second primary terminal block 12, and the secondary terminal block A connecting member is connected to each of the terminals 21 so as to extend from each terminal toward the first circuit board 3 . In this way, each of these terminals is electrically connected to the wiring provided on the first circuit board 3. Each terminal of the first primary side terminal block 11, each terminal of the second primary side terminal block 12, and each terminal of the secondary side terminal block 21 is made of copper or aluminum together with a connecting member. It may be integrally formed of a metal material with low resistivity.

In the cut end view of FIG. 4, the terminal 11U of the first primary terminal block 11 is connected to the first circuit through the connecting member 11Ue, and the terminal 12U of the second primary terminal block 12 is connected to the first circuit through the connecting member 12Ue. It is shown that it is electrically connected to wiring provided on the substrate 3. The cut end view of FIG. 5 shows that the terminal 21W of the secondary terminal block 21 is electrically connected to the wiring provided on the first circuit board 3 through the connection member 21We.

Three latching relays 33U, 33O, and 33W for enabling single-phase three-wire line switching are fixed to the first circuit board 3 placed near the bottom of the switch 1B, and are connected to the switch 1B. On the other hand, since they are arranged as described above, the switch 1B can accommodate as many as three latching relays inside the casing. In addition, if the connection between the relay and each terminal of each terminal block is made directly using a bar-shaped metal member as in the prior art, the assembly of the switch becomes complicated, and the switch is connected to three latching relays. It is difficult to configure the switch compactly when the switch is equipped with a switch.

However, in the switch 1B of Embodiment 1, latching occurs from each terminal of the first primary terminal block 11, each terminal of the second primary terminal block 12, and each terminal of the secondary terminal block 21. Electrical connections to the relays 33U, 33O, 33W are made through the first circuit board 3. Therefore, a switch including three latching relays can be configured compactly, and furthermore, a switch 1B can be realized in which each part shown in the circuit configuration of FIG. 2 is also integrally housed in a housing.

In addition, the arrangement order of each pole to which the three latching relays 33U, 33O, and 33W correspond in the width direction of the switch 1B is the first primary terminal block 11, the second primary terminal block 12, and This corresponds to the arrangement order of each pole of each terminal on the secondary side terminal block 21. Therefore, the connection between each terminal of each terminal block and the latching relay of each pole shown in the circuit diagram of FIG. 2 can be easily realized.

Furthermore, the switch 1B may include a current detector therein for detecting the current flowing through the first primary terminal block 11. The switch 1B may include a current detector therein for detecting the current flowing through the second primary terminal block 12. Alternatively, the switch 1B may include a current detector therein for detecting the current flowing through the secondary terminal block 21. A CT (Current Transformer) attached to each connection member may be appropriately applied to such a current detector.

<Application example of switch 1B>
FIG. 6 is a diagram showing an example of a scene where the switch 1B according to the first embodiment is applied. This example is an example in which the switch 1B is applied to a power system in a house or the like, which includes a solar panel 201 and a power storage device 105.

The switch 1B is installed in a distribution board 15B installed in the above-mentioned residence or the like. The distribution board 15B is provided with an earth leakage breaker 151 that is a main breaker, a plurality of branch breakers 152, and a bus bar 153 that connects the earth leakage breaker 151 and the branch breakers 152. In the distribution board 15B, a secondary line 21L connected to the secondary terminal block 21 of the switch 1B is connected to an earth leakage breaker 151 that is a main breaker.

Power is supplied from the commercial system 101 to the switch 1B disposed on the distribution board 15B via the smart meter 102, breaker 103, and breaker 106. If the smart meter 102 has a breaker function, the separate breaker 103 may not be provided. A first line 11L (primary side line) from such a commercial system 101 is connected to the first primary side terminal block 11 of the distribution board 15B.

Power can also be supplied from the solar panel 201 to the distribution board 15B via a PCS 202 (Power conditioning Subsystem) that controls the operation of the solar panel 201. There are two output systems of the PCS 202, and one output section 2021 of the PCS 202 is connected to the first line 11L via an earth leakage breaker 203. Here, the secondary side of the earth leakage breaker 203 is connected to the secondary side of the breaker 103 and the primary side of the breaker 106.

Power can be directly supplied to the distribution board 15B from the output unit 2022, which is the other output system of the PCS 202. Here, the output section 2022 is connected to a secondary line 21L connected to the secondary terminal block 21 of the switch 1B. The PCS 202 can switch between the output unit 2021 and the output unit 2022 and output from either of them.

The power storage device 105 is a device that stores surplus power generated by the solar panel 201 and discharges it as necessary. The power storage device 105 can also store power received from the commercial grid 101, for example, in preparation for a power outage. Input unit 1051 of power storage device 105 is connected to first line 11L via earth leakage breaker 108. Here, the primary side of the earth leakage breaker 108 is connected to the secondary side of the breaker 103 and the primary side of the breaker 106.

Power can be directly supplied from the output unit 1052 of the power storage device 105 to the distribution board 15B. The output section 1052 is connected via the breaker 107 to a second line 12L (primary side line) connected to the second primary side terminal block 12 of the switch 1B.

In order to control charging and discharging, power storage device 105 receives a signal from current detector 104 provided to measure the current supplied from commercial system 101 to first line 11L. The power storage device 105 also receives signals from a current detector 204 and a current detector 205, which are respectively provided to measure the current supplied from the solar panel 201 to the first line 11L or the secondary line 21L through the PCS 202. receive. For example, a CT may be used as the current detector 104, the current detector 204, or the current detector 205.

Note that when the switch 1B has a built-in current detector for detecting the current flowing through the first line 11L, that is, the current flowing through the first primary terminal block 11, the power storage device 105 Information about the current may be acquired from the switch 1B. When the switch 1B has a built-in current detector for detecting the current flowing through the second line 12L, that is, the current flowing through the second primary terminal block 12, the power storage device 105 Information about the current may be acquired from 1B.

Alternatively, the power storage device 105 acquires from the PCS 202 information about the magnitude of the current that the PCS 202 outputs to the first line 11L, or information about the magnitude of the current that the PCS 202 outputs to the secondary line 21L. It may be configured to do so.

The control unit 40 of the switch 1B can detect the state of power supply from the first line 11L using the first voltage monitor 511. Further, the control unit 40 of the switch 1B can detect the state of power supply from the second line 12L using the second voltage monitor 512. The control unit 40 detects, by the first voltage monitor 511, that the state where the voltage is supplied to the first line 11L has changed to the state where the voltage is not supplied, and the second voltage monitor 512 detects that the voltage has changed from the state where the voltage is supplied to the first line 11L to the state where the voltage is not supplied. Suppose that it is detected that voltage is being supplied to the second line 12L.

In this case, the control unit 40 controls the latching relays 33U, 33O, and 33W to change the connection state between the primary line and the secondary line connected to the switch 1B to 2. The next line 21L is switched from being connected to the first line 11L to being connected to the second line 12L.

At this time, the control unit 40 instructs all of the latching relays 33U, 33O, and 33W to perform the above-mentioned reset operation. As a result, the switch 1B can completely disconnect the in-house system after the distribution board 15B from the commercial system 101. In this case, the power storage device 105 appropriately performs the discharging operation, thereby enabling independent operation of the indoor system.

Furthermore, while the in-home system is in autonomous operation, the control unit 40 changes the first line 11L from a state in which voltage is not being supplied to a state in which voltage is being supplied by the first voltage monitor 511. It is assumed that the second voltage monitor 512 detects that the voltage is not being supplied to the second line 12L.

In this case, the control unit 40 controls the latching relays 33U, 33O, and 33W to change the connection state between the primary line and the secondary line connected to the switch 1B to 2. The next line 21L is switched from being connected to the second line 12L to being connected to the first line 11L. At this time, the control unit 40 instructs all of the latching relays 33U, 33O, and 33W to perform the above-mentioned setting operation. As a result, the switch 1B can return to the state of receiving power from the commercial grid 101.

In this way, the switch 1B allows the in-house system after the distribution board 15B to be completely separated from the commercial system 101. In this case, the power storage device 105 appropriately performs the discharging operation, thereby enabling independent operation of the indoor system. Such effects also contribute to achieving, for example, Goal 9 of the Sustainable Development Goals (SDGs) advocated by the United Nations, ``Developing resilient infrastructure.''

In addition, the compact switch 1B itself has a power failure detection function by being equipped with the first voltage monitor 511 and the like. Therefore, by arranging the switch 1B on the distribution board 15B, independent operation of the in-house system can be realized without the need to separately provide a module for detecting a power outage. Similarly, the switch 1B can return to the state of receiving power from the commercial grid 101 when the power is restored.

<Example of operation of switch 1B: During power outage>
Below, as an example of the operation of the switch 1B, as shown in FIG. 6, the operation of the switch 1B installed in the distribution board 15B when disconnecting the indoor system from the commercial system 101 for autonomous operation etc. will be explained with reference to FIG.

FIG. 7 is a diagram schematically showing the control state of the U-pole latching relay 33U, the O-pole latching relay 33O, and the W-pole latching relay 33W by the control unit 40. Here, the control state indicates that the control unit 40 has given instructions to each latching relay so that each latching relay is in a required connection state.

That is, when all the latching relays operate according to instructions from the control unit 40, the instruction status for each pole shown in FIG. 7 matches the actual connection status of each latching relay. However, if a situation occurs in which the latching relay cannot operate according to the instructions from the control unit 40 due to an abnormality such as welding of the relay contacts, the instructions for each pole shown in FIG. This does not necessarily match the connection situation of the latching relay.

In the control state Sb1 shown in FIG. 7, the control unit 40 controls the switch 1B to connect the first line 11L to the secondary line 21L in order to supply power from the commercial system 101 to the in-house system. This corresponds to the state in which The control state Sb4 corresponds to a state in which the control unit 40 controls the switch 1B to connect the second line 12L to the secondary line 21L in order to disconnect the domestic system from the commercial system 101.

Next, details of the operation will be explained in more detail. In the normal state where power is supplied from the commercial system 101 to the distribution board 15B, the control state Sb1 shown in FIG. Suppose that there is a state in which That is, it is assumed that the first line 11L and the secondary line 21L are connected.

In the control state Sb1, the control unit 40 may control the notification unit 70 to issue a notification using the lamp 71 indicating that normal power is being supplied from the commercial grid 101. Such notification may be performed by a specific lighting state of the lamp 71 or a specific color of emitted light, for example by continuously lighting the lamp 71 in green. Further, in the control state Sb1, the control unit 40 uses the first voltage monitor 511 and the second voltage monitor 512 to monitor whether voltage is supplied to the first line 11L and the second line 12L. .

Here, assume that a power outage occurs in the commercial system 101. It is assumed that the PCS 202 and the power storage device 105 are configured to detect a power outage and switch the output destination etc. as appropriate. The control unit 40 detects, by monitoring using the first voltage monitor 511 and the second voltage monitor 512, that the first line 11L has changed from being supplied with voltage to being not supplied with voltage. At the same time, it is detected that voltage is being supplied to the second line 12L. In this case, the control unit 40 executes a welding diagnosis of the latching relay according to the procedure described below, and then switches to a state where the second line 12L and the secondary line 21L are connected.

Further, the control unit 40 may control the notification unit 70 to issue a notification using a lamp 71 indicating that the welding diagnosis of the latching relay is being performed. Such notification may be performed by a specific lighting state of the lamp 71 or a specific color of light emitted, and may be performed by, for example, slow blinking of red light.

The control unit 40 instructs the U-pole latching relay 33U to perform a reset operation. As a result, the control state Sb2 shown in FIG. 7 is reached, in which the U-pole latching relay 33U is instructed to be in the reset state, the O-pole latching relay 33O is instructed to be in the set state, and the W-pole latching relay is instructed to be in the set state.

Subsequently, the control unit 40 instructs the O-pole latching relay 33O to perform a reset operation. As a result, the control state Sb3 shown in FIG. 7 is reached, in which the U-pole latching relay 33U is instructed to be in the reset state, the O-pole latching relay 33O is instructed to be in the reset state, and the W-pole latching relay is instructed to be in the set state. The control unit 40 uses the secondary side voltage monitor 52 to determine whether a voltage is applied between the U pole and the O pole on the secondary side.

Further, the control unit 40 instructs the W-pole latching relay 33W to perform a reset operation. As a result, the control state Sb4 shown in FIG. 7 is reached, in which the U-pole latching relay 33U is instructed to be in the reset state, the O-pole latching relay 33O is instructed to be in the reset state, and the W-pole latching relay is instructed to be in the reset state. The control unit 40 uses the secondary side voltage monitor 52 to determine whether a voltage is applied between the W pole and the O pole on the secondary side.

As a result of the above two determinations, if a voltage is applied between the U pole and the O pole, and a voltage is applied between the W pole and the O pole, the control unit 40 controls which latching relay 33U , 33O, and 33W are also determined to be operating normally. In this way, the welding diagnosis of the latching relay is completed.

The control unit 40 may control the notification unit 70 to issue a notification using a lamp 71 that indicates that self-sustaining operation is being performed by power supply from the power storage device 105. Such notification may be performed by a specific lighting state of the lamp 71 or a specific color of light emitted, for example by continuous lighting of red light. In this way, switching to a state in which the second line 12L and the secondary line 21L are connected is executed.

On the other hand, if the result of the above two determinations is that no voltage is applied between the U pole and the O pole or between the W pole and the O pole, the control unit 40 controls at least one of the latching relays. It is determined that an abnormality such as welding has occurred. In this way, the welding diagnosis of the latching relay is completed.

In this case, the control unit 40 may control the notification unit 70 to issue an abnormality notification indicating that an abnormality has occurred in the latching relay of the switch 1B. Such notification may be performed by a specific lighting state of the lamp 71 or a specific color of emitted light, and may be performed by, for example, a short-cycle flashing operation of red light.

Further, control unit 40 may transmit information to power storage device 105 through communication unit 60 that an abnormality has occurred in switch 1B. The power storage device 105 that has received information from the switch 1B that an abnormality has occurred in the switch 1B may stop discharging and stop supplying power to the in-house system.

In the switch 1B according to the first embodiment, the control unit 40 issues different switching instructions to each latching relay when switching the second line 12L to the state where it is connected to the secondary line 21L. Do it at the right time. In that case, the secondary side voltage monitor 52 is used to monitor whether voltage is applied between each pole on the secondary side in accordance with each switching instruction. Diagnose the presence or absence of welding.

In this way, the switch 1B according to the first embodiment can perform welding diagnosis of the latching relay when switching the line to self-sustaining operation. Therefore, if welding occurs in the latching relay included in the switch 1B, an abnormality can be reported and information to that effect can be transmitted to external equipment, and the power system to which the switch 1B is applied can be operated safely. It becomes like this. In addition, for this reason, it has a configuration suitable as a switching device applied to important locations for switching the input system to the main breaker.

<Example of operation of switch 1B: When power is restored>
Below, as an example of the operation of the switch 1B, the operation at the time of recovery when the power supply from the commercial grid 101 is resumed while the above-mentioned self-sustaining operation is being performed by power supply from the power storage device 105 is illustrated. This will be explained with reference to 8.

Control state Sb4 shown in FIG. 8 is control state Sb4 shown in FIG. 7 when self-sustaining operation is performed by power supply from power storage device 105 described above. Assume that the second line 12L and the secondary line 21L are currently connected. In the control state Sb4, the control unit 40 uses the first voltage monitor 511 and the second voltage monitor 512 to monitor whether voltage is being supplied to the first line 11L and the second line 12L.

Here, it is assumed that the power outage has been resolved in the commercial system 101. It is assumed that the PCS 202 and the power storage device 105 are configured to detect power restoration and switch the output destination etc. as appropriate. The control unit 40 detects, by monitoring using the first voltage monitor 511 and the second voltage monitor 512, that the first line 11L has changed from a state in which no voltage is supplied to a state in which voltage is supplied to the first line 11L. At the same time, it is detected that voltage is not being supplied to the second line 12L. In this case, after performing a welding diagnosis of the latching relay in accordance with the procedure described below, the first line 11L and the secondary line 21L are switched to a connected state.

The control unit 40 may control the notification unit 70 to issue a notification using a lamp 71 indicating that the welding diagnosis of the latching relay is being performed. Such notification may be performed by a specific lighting state of the lamp 71 or a specific color of light emitted, and may be performed by, for example, slow blinking of red light.

The control unit 40 instructs the U-pole latching relay 33U to perform a set operation. As a result, the control state Sb5 shown in FIG. 8 is reached, in which the U-pole latching relay 33U is instructed to be in the set state, the O-pole latching relay 33O is instructed to be in the reset state, and the W-pole latching relay is instructed to be in the reset state.

Subsequently, the control unit 40 instructs the O-pole latching relay 33O to perform a set operation. As a result, the control state Sb6 shown in FIG. 8 is reached, in which the U-pole latching relay 33U is instructed to be in the set state, the O-pole latching relay 33O is instructed to be in the set state, and the W-pole latching relay is instructed to be in the reset state. The control unit 40 uses the secondary side voltage monitor 52 to determine whether a voltage is applied between the U pole and the O pole on the secondary side.

Further, the control unit 40 instructs the W-pole latching relay 33W to perform a set operation. As a result, the control state Sb7 shown in FIG. 8 is reached, in which the U-pole latching relay 33U is instructed to be set, the O-pole latching relay 33O is instructed to be set, and the W-pole latching relay 33O is instructed to be set. The control unit 40 uses the secondary side voltage monitor 52 to determine whether a voltage is applied between the W pole and the O pole on the secondary side.

As a result of the above two determinations, if a voltage is applied between the U pole and the O pole, and a voltage is applied between the W pole and the O pole, the control unit 40 controls which latching relay 33U , 33O, and 33W are also determined to be operating normally. In this way, the welding diagnosis of the latching relay is completed.

The control unit 40 may control the notification unit 70 to issue a notification using a lamp 71 indicating that normal power is being supplied from the commercial grid 101. Such notification may be performed by a specific lighting state of the lamp 71 or a specific color of emitted light, for example by continuously lighting the lamp 71 in green. In this way, switching to a state in which the first line 11L and the secondary line 21L are connected is executed.

On the other hand, if the result of the above two determinations is that no voltage is applied between the U pole and the O pole or between the W pole and the O pole, the control unit 40 controls at least one of the latching relays. It is determined that an abnormality such as welding has occurred. In this way, the welding diagnosis of the latching relay is completed.

In this case, the control unit 40 may control the notification unit 70 to issue an abnormality notification indicating that an abnormality has occurred in the latching relay of the switch 1B. Such notification may be performed by a specific lighting state of the lamp 71 or a specific color of emitted light, and may be performed by, for example, a short-cycle flashing operation of red light. Further, control unit 40 may transmit information to power storage device 105 through communication unit 60 that an abnormality has occurred in switch 1B.

In the switch 1B according to the first embodiment, in this way, the control unit 40 issues different switching instructions to each latching relay when switching to a state where the first line 11L is connected to the secondary line 21L. Do it at the right time. In that case, the secondary side voltage monitor 52 is used to monitor whether voltage is applied between each pole on the secondary side in accordance with each switching instruction. Diagnose the presence or absence of welding.

In this way, the switch 1B according to the first embodiment can perform a welding diagnosis of the latching relay when returning to the power supply from the commercial grid 101 from the self-sustaining operation. Therefore, when an abnormality occurs in the latching relay included in the switch 1B, the abnormality can be notified and information to that effect can be transmitted to external equipment, making it possible to safely operate the power system to which the switch 1B is applied. Becomes operational. In addition, for this reason, it has a configuration suitable as a switching device applied to important locations for switching the input system to the main breaker.

[Embodiment 2]
In the second embodiment, a method for expanding the functions of a distribution board will be described. FIG. 9 is a schematic diagram showing a distribution board 15 for residential use. The distribution board 15 is provided with an earth leakage breaker 151 as a master breaker, and a plurality of branch breakers 152 connected to the load side of the master breaker.

Depending on the power company you contract with, a limiter (service breaker) is installed in the distribution board 15, so as shown in FIG. 9, the residential distribution board 15 has a limiter space LS for installing the limiter. is ensured. However, some electric power companies do not install limiters in the distribution board 15.

Furthermore, in recent years, there has been a tendency for power meters to be replaced with smart meters, and in that case, the limiter installed in the distribution board 15 may be removed. In this way, there are increasing chances that the limiter space LS in the distribution board 15 is a vacant space. FIG. 9 shows the distribution board 15 in which the limiter space LS is an empty space.

The method for expanding the functions of a distribution board according to the second embodiment is characterized in that work is performed to install the switch 1B according to the first embodiment in the distribution board 15. In the second embodiment, the switch 1B according to the first embodiment is arranged in the limiter space LS, which is an empty space, in the distribution board 15 shown in FIG. 9 . Since the switch 1B is compactly constructed as one unit, it can be disposed in the limiter space LS of the distribution board 15 in this way.

FIG. 10 shows the electricity distribution board 15B after implementing the method for expanding the functionality of the electricity distribution board according to the second embodiment. The switch 1B is fixed to the limiter space LS of the distribution board 15B, and the switch 1B is connected to the secondary side terminal block 21 of the switch 1B via the secondary line 21L of the switch 1B. 151.

For example, as shown in FIG. 6, a first line 11L (primary side line) from the commercial system 101 is connected to the first primary side terminal block 11 of the switch 1B. Further, as shown in FIG. 6, for example, a second line 12L (primary side line) from the power storage device 105 is connected to the second primary side terminal block 12 of the switch 1B. .

Moreover, in the distribution board 15B, the switch 1B equipped with three latching relays for switching each pole is installed, thereby making it possible to reliably disconnect the commercial system 101 from the domestic system. Furthermore, by switching the connection destination using the switch 1B, it becomes possible to perform autonomous operation of the indoor system using the power storage device 105 and the like.

Furthermore, since the switch 1B itself has these functions, by installing the switch 1B in the distribution board 15, there is no need to install other functional modules in the distribution board 15. These functions can also be expanded in the distribution board 15B. Therefore, by applying the switch 1B, these functional extensions to the distribution board 15 can be easily carried out.

〔summary〕
Aspect 1 of the present disclosure provides a method for connecting a connection destination of the secondary line between a primary line and a secondary line having a first line and a second line to the first line and the second line. A switching device to be installed in a distribution board that switches to either one of the lines, comprising a housing, a plurality of switching type latching relays housed in the housing, and an operation of the plurality of latching relays. The control unit includes a control unit that controls, and a first voltage monitor that monitors a voltage applied to the first line, and the control unit is supplied with voltage to the first line by the first voltage monitor. When it is detected that the voltage has changed from the state to the state where no voltage is supplied, each of the latching relays is controlled to change the state from the state in which the first line is connected to the secondary line to the second line. This is a switch that switches the line to a state where it is connected to the secondary side line.

A switching device according to a second aspect of the present disclosure is characterized in that, in the first aspect, the switch further includes a circuit board that holds the plurality of latching relays.

The switching device according to aspect 3 of the present disclosure is the switching device according to aspect 2, further comprising a plurality of terminals for connecting to the first line, the second line, and the secondary side line, and The terminals are each connected to the latching relay via the circuit board.

Aspect 4 of the present disclosure is a single-phase three-wire switching device, which is provided with three latching relays for switching the connection of each pole in any one of aspects 1 to 3 above. .

In the switch according to aspect 5 of the present disclosure, in any one of aspects 1 to 4 above, the latching relay is a relay that has an electromagnetic coil inside for driving a contact, and the electromagnetic coil is arranged in parallel. Preferably, the plurality of latching relays are arranged inside the housing in the same direction.

The distribution board according to aspect 6 of the present disclosure is arranged to connect a connection destination of the secondary line between a primary line and a secondary line, each having a first line and a second line, to the first line and the second line. A switching device to be installed in a distribution board that switches to either one of a railway line and the second line, the switch comprising a housing, a plurality of switching type latching relays housed in the housing, and a plurality of switching type latching relays housed in the housing. The control unit includes a control unit that controls the operation of the latching relay, and a first voltage monitor that monitors the voltage applied to the first line, and the control unit controls the voltage applied to the first line by the first voltage monitor. When detecting a change from a state in which voltage is being supplied to a state in which voltage is not being supplied, each of the latching relays is controlled to connect the first line to the secondary line. In this distribution board, a switch for switching the second line to be connected to the secondary line is attached to the limiter space.

Aspect 7 of the present disclosure is a method for expanding the functionality of a distribution board, which adds a new module to a distribution board that includes a limiter space in which a limiter can be installed, a main breaker, and a branch breaker. switching the connection destination of the secondary line between a primary line and a secondary line having a first line and a second line to either the first line or the second line; A switching device to be installed in a distribution board, which includes a housing, a plurality of switching type latching relays housed in the housing, a control unit that controls operations of the plurality of latching relays, and a control unit that controls the operation of the plurality of latching relays. a first voltage monitor that monitors a voltage applied to one line; When it detects that the state has changed to a state in which the latching relay is not connected, it controls each of the latching relays so that the state in which the first line is connected to the secondary line is changed to the state in which the second line is connected to the secondary line. This is a function expansion method of a distribution board, in which a switch that switches to a state where it is connected to the limiter space is attached as the module in the limiter space.

The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the claims, and embodiments can be obtained by appropriately combining technical means disclosed in different embodiments. are also included within the technical scope of the present invention.

1B Switch (switcher)
2 Insert case (housing)
3 First circuit board (circuit board)
4 Second circuit board 5 Cover case (casing)
6 Bottom plate (casing)
8 Harness 9 Through hole 11 First primary terminal block 12 Second primary terminal block 21 Secondary terminal block 11O, 11U, 11W, 12O, 12U, 12W, 21O, 21U, 21W Terminals 11Ue, 12Ue , 21We Connection members 33O, 33U, 33W Latching relay 31 Electromagnetic coil 40 Control unit 511 First voltage monitor 512 Second voltage monitor 52 Secondary voltage monitor 60 Communication unit 61 Communication connector 70 Notification unit 71 Lamps 15, 15B Distribution board 151 Earth leakage breaker 152 Branch breaker LS Limiter space 11L 1st line, primary side line 12L 2nd line, primary side line 21L Secondary side line 105 Power storage device

Claims (7)

A switching device installed in a distribution board that switches the connection destination of a secondary side line to either a first line or a second line,
A casing and
a plurality of switching type latching relays housed in the housing;
a control unit that controls the operation of the plurality of latching relays;
a first voltage monitor that monitors the voltage applied to the first line,
The control unit includes:
When the first voltage monitor detects that the first line has changed from being supplied with voltage to being not supplied with voltage,
Controlling each of the latching relays to switch from a state in which the first line is connected to the secondary line to a state in which the second line is connected to the secondary line. vessel. The switch according to claim 1, further comprising a circuit board that holds the plurality of latching relays. Further comprising a plurality of terminals for connecting to the first line, the second line, and the secondary line,
The switch according to claim 2, wherein each of the plurality of terminals is connected to the latching relay via the circuit board. A single-phase three-wire switching device,
The switch according to any one of claims 1 to 3, comprising the three latching relays that switch the connection of each pole. The latching relay is a relay that has an electromagnetic coil inside for driving contacts,
The switch according to any one of claims 1 to 3, wherein the plurality of latching relays are arranged in the same direction inside the housing so that the electromagnetic coils are arranged in parallel. Switch the connection destination of the secondary line between a primary line and a secondary line having a first line and a second line to either the first line or the second line. , a switching device for installation in a distribution board,
a casing, a plurality of switching type latching relays housed in the casing, a control unit that controls operations of the plurality of latching relays, and a first voltage monitor that monitors the voltage applied to the first line. and,
The control unit controls each of the latching relays when the first voltage monitor detects that the first line is changed from being supplied with voltage to being not supplied with voltage. , a switch that switches from a state in which the first line is connected to the secondary line to a state in which the second line is connected to the secondary line,
Distribution board installed in the limiter space. A method for expanding the functions of a distribution board, which includes adding a new module to a distribution board equipped with a limiter space in which a limiter can be installed, a main breaker, and a branch breaker,
Switch the connection destination of the secondary line between a primary line and a secondary line having a first line and a second line to either the first line or the second line. , a switching device for installation in a distribution board,
a casing, a plurality of switching type latching relays housed in the casing, a control unit that controls operations of the plurality of latching relays, and a first voltage monitor that monitors the voltage applied to the first line. and,
The control unit controls each of the latching relays when the first voltage monitor detects that the first line is changed from being supplied with voltage to being not supplied with voltage. , a switch that switches from a state in which the first line is connected to the secondary line to a state in which the second line is connected to the secondary line,
A method for expanding the functionality of a distribution board, in which the module is installed in the limiter space.

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