JP6697946B2 - Automatic power switching device - Google Patents

Description

  The present invention relates to an automatic power source switching device that switches to a distributed power source when a power failure occurs in a commercial power source and continuously supplies power to a specific load.

  In the event of a power failure, there is a distribution board that can reduce failures and damages caused by a power failure by switching the power source of a specific electric device such as an emergency light or a refrigerator from a commercial power source to a distributed power source such as a storage battery. For example, in Patent Document 1, when a commercial power source is equipped with an automatic power source switching device and automatically switches to a distributed power source when a commercial power source fails, the power source of a specific electric device is switched from a commercial power source to a distributed power source such as a storage battery so as to continue operation. It is configured.

JP, 2016-39755, A

Since the switching switch disclosed in Patent Document 1 performs automatic switching, it requires a power supply for operating its control unit, and both the commercial power supply and the distributed power supply are connected to the power supply circuit of the control unit. , Normally, the power was supplied from the commercial power source, and the power was supplied from the distributed power source only during a power failure.
Distributed power supplies intended for use in emergencies such as power outages are usually controlled so that they will not output power unless a power outage occurs in the commercial power supply, and even if connected to the power supply circuit in parallel with the commercial power supply. No contact with commercial power source. However, it cannot be said that there is a possibility that the distributed power supply will start energizing even though the commercial power supply is energized due to a failure of the control circuit on the distributed power supply side, etc. Then, a large current may be generated and the connected device may be damaged.

  Therefore, in view of such problems, an object of the present invention is to provide an automatic power source switching device that shuts off the distributed power source from the control unit of the automatic power source switching device when a contact between the commercial power source and the distributed power source occurs. .

In order to solve the above problems, the invention of claim 1 provides a switching opening/closing section for switching a load power supply between a commercial power supply and a distributed power supply, a switching drive section for driving the switching, and a power failure/recovery of the commercial power supply. An automatic power supply switching device that has a control unit that monitors and controls the switching drive unit and that switches the load power supply to the distributed power supply when a commercial power failure occurs and switches to the commercial power supply when power is restored. A circuit opening/closing switch and a voltage sensor are provided on both the power supply line from the commercial power supply circuit and the power supply line from the distributed power supply circuit to the power supply circuit of the control unit, and the control unit detects the voltage from both the voltage sensors and controls the distributed power supply side. The circuit opening/closing switch is opened, the circuit opening/closing switch on the side of the commercial power supply circuit is closed, and the switching opening/closing unit is operated to a neutral position where it is not connected to anything.
According to this configuration, even if the commercial power source is in the energized state, if the distributed power source supplies the power and the contact occurs, the distributed power source is cut off from the power supply circuit. Therefore, it is possible to prevent an accident due to the occurrence of mixed contact and protect the control unit. At the same time, the switching opening/closing section is operated to the neutral position to shut off the load from both power sources, so that the load is not affected by touching.

According to a second aspect of the present invention, in the configuration according to the first aspect, the switching opening/closing section has an operation handle for manually switching the power source, while the switching drive section engages with the operation handle to perform the operation. It has a handle hook part for operating the handle to switch the power source, and the control part controls the operating handle to switch the power source.
According to this configuration, since the handle hook portion is engaged with the operation handle for operation, automatic switching is possible without significantly changing the conventional manually operated switching switch, and automatic switching at low cost is possible. Can be implemented.

According to a third aspect of the present invention, in the configuration according to the first or second aspect, the switching opening/closing section includes a first circuit connection terminal to which the commercial power source is connected, a second circuit connection terminal to which the distributed power source is connected, and a load. And a third circuit connecting terminal to which is connected, wherein the second circuit connecting terminal and the third circuit connecting terminal are copper bar type terminals that enable connection of a plug-in type terminal of a branch breaker or an earth leakage breaker. It is characterized by
According to this configuration, since the second circuit connecting terminal and the third circuit connecting terminal are copper bar type terminals, a branch breaker whose primary side connecting terminal is a plug-in type can be directly connected to the third circuit connecting terminal. A secondary side connection terminal can directly connect a plug-in type earth leakage breaker to the two-circuit connection terminal. Therefore, there is no need for a power distribution path from the switching opening/closing section to the branch breaker, and there is no need for a power distribution path from the earth leakage breaker to which the distributed power source is connected to the switching opening/closing section.

According to a fourth aspect of the present invention, in the configuration according to the third aspect, the switching opening/closing section is assembled in a housing separable from the switching driving section and the control section, the operation handle is provided on the upper surface of the housing, and the first circuit connection is provided on the front side. The second circuit connection terminal and the third circuit connection terminal are arranged on the terminal and the back surface, and the switching drive unit and the control unit are assembled to the side portion of the housing.
According to this configuration, since the switching opening/closing section is formed by a dedicated housing, it can be used as a manual switching switch when the switching driving section and the control section are removed, and the manual/automatic configuration change can be easily performed. it can.

According to a fifth aspect of the present invention, in the configuration according to the fourth aspect, the handle hook portion, the switching drive portion, and the control portion are integrally formed and are detachably assembled to the housing.
According to this configuration, since the handle hook portion, the switching drive portion, and the control portion are integrally configured, they can be easily attached to and detached from the housing, and manual/automatic switching can be easily performed.

  According to the present invention, even if the commercial power source is in the energized state, if the distributed power source supplies the power and the contact occurs, the distributed power source is cut off from the power supply circuit. Therefore, it is possible to prevent an accident due to the occurrence of mixed contact and protect the control unit. At the same time, the switching opening/closing section is operated to the neutral position to cut off the specific load from both power sources, so that the load is not affected by the contact.

It is a perspective explanatory view showing an example of an automatic power source switching device concerning the present invention, and also shows a branch breaker. FIG. 3 is a perspective explanatory view of an automatic power source switching device in which a housing that constitutes a switching opening/closing portion and a switching drive control portion are separated from each other, and a state is shown and a branch breaker and an earth leakage breaker to be connected are also shown. It is a perspective explanatory view which also removed the one part cover of FIG. 1, and also showed the enlarged view of the principal part. It is a top view of an automatic power source switching device, and also shows a branch breaker and an earth leakage breaker. It is an internal circuit diagram of a switching opening/closing part. It is a circuit block diagram of a switching drive control unit. It is the sectional view on the AA line. It is a BB line sectional view. It is CC sectional view taken on the line. It is CC sectional view taken on the line of the state which connected and operated the switching opening/closing part to one side.

  Hereinafter, embodiments embodying the present invention will be described in detail with reference to the drawings. 1 to 4 show an example of a power supply automatic switching device according to the present invention, FIG. 1 is a perspective explanatory view, FIG. 2 is a perspective explanatory view in which a housing constituting a switching opening/closing section and a switching drive control section are separated, and FIG. Is a perspective explanatory view showing an enlarged view of a main part with a part of the cover removed, and FIG. 4 is a plan view. In each case, the branch breaker and the earth leakage breaker to be connected are also shown together. Reference numeral 1 is an automatic power supply switching device, 2 is a branch breaker, and 3 is an earth leakage breaker, and a configuration for switching a single-phase three-wire type electric circuit is shown.

The automatic power source switching device 1 includes a switching opening/closing unit 4 and a switching drive control unit 5. The switching opening/closing unit 4 is provided with an operation handle 11 for performing a switching operation on the upper surface of the housing 10 and is located in front (on the right side in FIG. 4). ) The first circuit connection terminal 12 (first voltage pole terminal 12a, neutral pole terminal 12b, second voltage) connected to one fixed contact 17A of a pair of fixed contacts 17 (17A, 17B) described later. The pole terminal 12c) is arranged, and the second circuit connection terminal 13 (first voltage pole terminal 13a, neutral pole terminal) connected to the other fixed contact 17B is provided on the rear surface (left side in FIG. 4) of the housing 10. 13b, the second voltage pole terminal 13c) are arranged. Further, a third circuit connection terminal 14 (first voltage pole terminal 14a, neutral pole terminal 14b, second voltage pole terminal 14c) connected to a movable contact 15 described later is also arranged on the back surface. Incidentally, 6 is a terminal cover for protecting the terminals.
As described above, the switching opening/closing part 4 is configured by one housing 10 and constitutes a switching switch that can be manually switched.

The first circuit connection terminals 12 are screw-type terminals for connecting and fixing a cable (not shown) with screws 8 (shown in FIG. 7 ), and are arranged three in a row in the left-right direction. As shown in FIG. The child 12a, the neutral pole terminal 12b, and the second voltage pole terminal 12c are arranged in this order.
On the other hand, the second and third circuit connection terminals 13 and 14 are arranged adjacent to the flat standing surface, and each terminal is formed of a horizontally long copper bar type terminal. In each case, three copper bar type terminals are arranged side by side in the vertical direction, and the neutral pole terminals 13b and 14b, the first voltage pole terminals 13a and 14a, and the second voltage pole terminals 13c and 14c are arranged from the top. . In particular, the third circuit connecting terminal 14 is formed wide so that a plurality of branch breakers 2 can be connected adjacent to each other.

  The branch breaker 2 is shown schematically, and an operation lever for opening and closing and a secondary side terminal are omitted. However, as shown in FIG. 2, the primary-side terminal 21 is a plug-in type terminal formed by forming a notch in the lateral direction on the back surface of the branch breaker 2 and is a copper bar-type terminal ( The third circuit connection terminal 14) is sandwiched from above and below to be connected. The primary side terminal 21 has three terminals arranged vertically and arranged from the top to the neutral pole terminal 21b, the first voltage pole terminal 21a, and the second voltage pole terminal 21c, and the third circuit of the switching opening/closing section 4. It is directly connected to the connection terminal 14.

  The earth leakage breaker 3 has substantially the same shape as the branch breaker 2, the operation lever 31 is arranged on the upper surface, the primary side terminal 32 is arranged on the inclined front surface, and the secondary side terminal 33 is arranged on the rear surface. There is. Both terminals are vertically arranged in triplicate, and the primary side terminals 32 are formed as immediate connection terminals. On the other hand, the secondary side terminal 33 is a plug-in type terminal formed by forming a notch in the lateral direction similarly to the primary side terminal 21 of the branch breaker 2, and the neutral pole terminal 33b, the first terminal from the top. The voltage pole terminal 33a and the second voltage pole terminal 33c are arranged in this order, and are directly connected to the second circuit connection terminal 13 of the switching opening/closing section 4. In addition, 9 has shown the cable of the distributed power supply circuit.

  As described above, since the second circuit connecting terminal 13 and the third circuit connecting terminal 14 are copper bar type terminals, the branch breaker 2 whose primary side connecting terminal is the plug-in type can be directly connected to the third circuit connecting terminal 14. The secondary side connection terminal can directly connect the second circuit connection terminal 13 to the plug-in type earth leakage breaker 3. Therefore, there is no need for a power distribution path from the switching opening/closing section 4 to the branch breaker 2, and there is no need for a power distribution path from the leakage breaker 3 to which the distributed power source is connected to the switching opening/closing section 4, and a circuit for switching the power supply can be formed in a space-saving manner. it can.

  FIG. 5 is a circuit diagram of the switching opening/closing unit 4, that is, an internal circuit diagram of the housing 10 that constitutes the switching switch. As shown in FIG. 5, each of the connection terminals 12 (12a to 12c), 13 (13a to 13c), and 14 (14a to 14c) is configured in threes. Then, the third circuit connection terminal 14 performs switching connection between the first circuit connection terminal 12 and the second circuit connection terminal 13 by the operation of the operation handle 11, and has three postures including a neutral open state in which the third circuit connection terminal 14 is not connected. It is selectable.

  Specifically, when the automatic power source switching device 1 is used in a circuit that switches a power source from a commercial power source to a storage battery system circuit having a storage battery as a distributed power source in the event of a power failure, a branch breaker (specific branching) is connected to the third circuit connection terminal 14. A circuit to which an electric device (specific load) is connected is connected via a breaker) 2, a commercial power source circuit to which a commercial power source is connected is connected to a first circuit connecting terminal 12, and an earth leakage breaker is connected to a second circuit connecting terminal 13. A storage battery system circuit (distributed power supply system circuit) is connected via 3, and the power supply is switched when a power failure of the commercial power supply is detected as described later.

The switching drive control unit 5 includes a metal plate-shaped base 51, a switching drive unit 50 including a handle hook portion 52, a motor 53, and a transmission mechanism portion 54 that transmits the rotation of the motor 53 to the handle hook portion 52. A circuit accommodating portion 55 that accommodates a control circuit (control portion) that controls 53 to perform switching, and an engagement/disengagement sensor 57 that detects an engagement/disengagement state of the handle hook portion 52 with respect to the operation handle 11 are assembled. Three photo interrupters 58 for detecting the operation angle of the portion 52 are assembled to the base 51 via the fixing pieces 51a.
The base 51 is screwed and fixed to the housing 10, and the switching drive control unit 5 is integrated with the switching opening/closing unit 4. Further, the switching drive control unit 5 fixed to the housing 10 is covered with a cover frame 56 which is similarly screwed and fixed to the housing 10.
Since the handle hook portion 52, the switching drive portion 50, and the circuit housing portion 55 are integrally formed in this manner, they can be easily attached to and detached from the housing 10, and the manual/automatic configuration change can be easily performed. it can.

  The handle hook portion 52 is formed in a lid shape that covers the entire operation handle 11, and the end portion located on the side of the operation handle 11 is pivotally attached to the rotating piece 54b of the transmission mechanism portion 54. The handle hook portion 52 can be tilted/standing up in the left-right direction of the housing 10 around this shaft attachment portion, and is configured to be detachable from the operation handle 11. FIG. 1 shows a state in which the handle hook portion 52 is tilted halfway. When the handle hook portion 52 is tilted until it becomes horizontal in the direction indicated by the arrow P1, the operation handle 11 is covered as shown in FIG. Engage with the operation handle 11.

In addition, the rotating piece 54b to which the handle hook portion 52 is attached is provided with a gear 54a that constitutes the transmission mechanism portion 54, and the gear 54a rotates via the gear 54c that is rotated by the drive of the motor 53. The handle hook portion 52 rotates in the front-rear direction of the case 10. In this way, the operation handle 11 tilts forward or backward.
The motor 53 is attached to the base 51 in a state of protruding in the direction of the housing 10 to be attached, but a cylindrical recess 10a is formed in a portion of the housing 10 corresponding to the position of the motor 53. The protruding portion of 53 can be stored.

As described above, since the motor 53 having a depth can be housed in the housing 10 of the switching opening/closing section 4, even if the switching drive control section 5 is assembled to the housing 10, it can be configured so as not to have a large projecting portion, and can be assembled in a small space.
As shown in the enlarged view of FIG. 3, an engaging piece 59 for engaging the photo interrupter 58 and recognizing the rotational angle of the rotating piece 57b is attached to the rotating piece 54b.

  FIG. 6 shows a circuit block diagram of the switching drive control unit 5. As shown in FIG. 6, a control circuit 61 for controlling the motor 53, a power supply circuit 62 for supplying power to the control circuit 61 and the motor 53, a circuit opening/closing switch 63a composed of a semiconductor switch for cutting off commercial power, and presence/absence of commercial power The power supply circuit 62 has a commercial power supply voltage sensor 63b for detecting, a circuit opening/closing switch 64a composed of a semiconductor switch for shutting off the storage battery power supply, a storage battery power supply voltage sensor 64b for detecting the presence or absence of the storage battery power supply, and the power supply circuit 62 is supplied with power from the commercial power supply circuit. Both the electric wire and the power supply line from the storage battery power supply circuit are connected. The circuit housing portion 55 houses a control circuit 61 and a power supply circuit 62.

  In the switching drive control unit 5 thus configured, the control circuit 61 performs the following control in addition to the control of the switching opening/closing unit 4 described later. The control circuit 61 monitors the state of the commercial power source by the commercial power source voltage sensor 63b, monitors the output state of the storage battery power source by the storage battery power source voltage sensor 64b, and monitors the occurrence of contact.

Normally, the storage battery power supply voltage sensor 64b does not detect the voltage because the storage battery power supply voltage sensor 64b does not detect the voltage as long as the commercial power supply is in the energized state, but the storage battery power supply has some problem and the commercial power supply is energized. When the storage battery power supply starts output of electric power (voltage) in the state of being maintained, the storage battery power supply voltage sensor 64b detects it and outputs a voltage detection signal to the control circuit 61. Upon receiving this voltage detection signal, the control circuit 61 determines that a contact has occurred and outputs an open signal to the circuit opening/closing switch 64a on the storage battery power supply circuit side to shut off the storage battery power supply and connect the power supply circuit 62 to the commercial power supply circuit. Only
Further, the operation handle 11 of the switching opening/closing part 4 is operated via the handle hook part 52 to move the movable contact 15 to a neutral position where it is not connected to any power source.

As described above, even when the commercial power source is in the energized state, if the power is also supplied from the storage battery power source and a contact occurs, the storage battery power source is shut off from the power supply circuit 62. Therefore, it is possible to prevent an accident due to the occurrence of mixed contact and protect the control circuit 61. At the same time, the switching opening/closing section 4 is operated to the neutral position to disconnect the load from both power sources, so that the load is not affected by the contact.
In the normal state where the commercial power source is in the energized state, the normal storage battery power source does not generate power, so the circuit opening/closing switch 64a on the side of the storage battery power source may be open or closed. When the commercial power supply fails, the storage battery power supply side recognizes it and starts outputting electric power, so that the control circuit 61 continues the control.

7 to 10 are cross-sectional views in which the housing 10 is cut at different portions. The internal structure of the housing 10 and the operation of the switching opening/closing section 4 will be described below with reference to this drawing. FIG. 7 is a cross-sectional view taken along the line AA of FIG. 3, showing an internal connection structure of the three first voltage electrode terminals 12a, 13a, 14a. As shown in FIG. 7, a movable contact 16a having movable contacts 15 on both front and rear sides is arranged in the housing 10 so as to hang down at the lower part of the operation handle 11, and a pair of fixed contacts 17 (17Aa, 17Aa, 17Ba) is arranged.
The movable contact 15 is connected to the first voltage pole terminal 14a of the third circuit connection terminal 14 via the movable contact 16a and the flexible conductor 18 connected to the movable contact 16a. One fixed contact 17Aa arranged in the front is connected to the first voltage pole terminal 12a of the first circuit connecting terminal 12 via the copper bar 7a, and the other fixed contact 17Ba arranged in the rear is connected via the copper bar 7b. Are connected to the first voltage pole terminal 13a (shown in FIG. 2) of the second circuit connection terminal 13.

FIG. 8 is a cross-sectional view taken along the line BB, showing the internal connection structure of the three neutral pole terminals 12b, 13b, 14b. As shown in FIG. 8, movable contacts 16b having movable contacts 15 on both front and rear sides are arranged so as to hang down below the operation handle 11, and a pair of fixed contacts 17 (17Ab, 17Bb) are arranged in front and behind thereof. ing.
The movable contact 15 is connected to the neutral electrode terminal 14b of the third circuit connection terminal 14 via the movable contactor 16b and the flexible lead wire 18, similarly to the structure of the first voltage pole described above. One fixed contact 17Ab arranged at the front is connected to the neutral terminal 12b of the first circuit connecting terminal 12 via the copper bar 7a, and the other fixed contact 17Bb arranged at the rear is connected via the copper bar 7b. The second circuit connecting terminal 13 is connected to the neutral terminal 13b (shown in FIG. 2).

Further, FIG. 9 is a sectional view taken along the line CC, showing an internal connection structure of the three second voltage pole terminals 12c, 13c, 14c. As shown in FIG. 9, movable contacts 16c having movable contacts 15 on both front and rear sides are arranged so as to hang down at the bottom of the operation handle 11, and a pair of fixed contacts 17 (17Ac, 17Bc) are arranged in front and rear thereof. ing.
The movable contact 15 is connected to the second voltage pole terminal 14c of the third circuit connection terminal 14 via the movable contactor 16c and the flexible conductor 18 similarly to the terminal structure of the first voltage pole described above. Further, one fixed contact 17Ac arranged in the front is connected to the second voltage pole terminal 12c of the first circuit connecting terminal 12 via the copper bar 7a, and the other fixed contact 17Bc arranged in the rear is the copper bar 7b. Is connected to the second voltage pole terminal 13c (shown in FIG. 2) of the second circuit connection terminal 13.

The switching opening/closing section 4 configured as described above is switched as follows. The movable contact 16 is configured to rotate back and forth by operating the operation handle 11, and tilts the operation handle 11 forward, that is, the handle hook portion 52 rotates forward and tilts the operation handle 11 forward. Then, the movable contact 16 also rotates forward. When the operation handle 11 is tilted rearward, that is, when the handle hook portion 52 is rotated backward and the operation handle 11 is tilted rearward, the movable contact 16 is also rotated rearward. Thus, the movable contact 15 is selectively connected to the one fixed contact 17.
For example, when the operation handle 11 is tilted to the right side (front) shown in FIG. 4, the movable contact 5 comes into contact with the front fixed contact 17A to connect the first circuit connecting terminal 12 and the third circuit connecting terminal 14. To be done. FIG. 10 is a cross-sectional view taken along the line C-C of this connection state, that is, the state where the operation handle 11 is tilted forward.

The control circuit 61 controls the motor 53 to operate the operation handle 11 with respect to the switching opening/closing section 4 configured as described above to perform a power switching operation. Specifically, as long as the commercial power supply circuit is energized, the commercial power supply voltage sensor 63b outputs a voltage detection signal to the control circuit 61, and the control circuit 61 recognizes the energization and connects the third circuit of the switching opening/closing section 4. The connection of the terminal 14 to the first circuit connection terminal 12 is continued. Then, when the commercial power supply voltage sensor 63b detects a power failure, the third circuit connection terminal 14 is connected to the second circuit connection terminal 13. After that, when the commercial power supply voltage sensor 63b detects the voltage of the commercial power supply, that is, when the power recovery is detected, the connection of the third circuit connection terminal 14 is returned to the first circuit connection terminal 12.
At the time of this control, whether the connection with the commercial power supply circuit is completed, the connection with the storage battery system circuit is completed, or the neutral state in which the circuit is not connected to any of the circuits is received by the signals of the three photo interrupters 58. Judgment is made.

  In addition, the control circuit 61 determines from the signal of the engagement/disengagement sensor 57 that the handle hook portion 52 is disengaged from the operation handle 11 or that the handle hook portion 52 is upright and disengaged from the operation handle. The handle hook portion 52 is returned to the neutral position and the control is stopped.

In this way, since the controlled operation angle of the handle hook portion 52, that is, the tilt angle of the operation handle 11 is detected and controlled, the control for operating the operation handle 11 to perform switching can be reliably performed. On the other hand, since the switching opening/closing section 4 has the operation handle 11, the switching opening/closing section 4 can be manually operated and can be easily switched regardless of power failure/power recovery, which is convenient.
Further, since the handle hook portion 52 is engaged with the operation handle 11 for operation, automation can be performed without significantly changing the conventional manually operated switching switch, and automation can be performed at low cost.
Further, when the handle hook portion 52 is disengaged, or when the handle hook portion 52 is disengaged, the handle hook portion 52 is moved to the off position of the operation handle 11, so that the switching operation of the switching opening/closing portion 4 is always performed when the operation handle 11 is attached. It can be performed in the off state and is easy to put on. Further, since the control is stopped when the handle hook portion 52 comes off from the operation handle 11, malfunction can be prevented.
In addition, since the switching opening/closing section 4 is formed of a dedicated housing, it becomes possible to use it as a manual switching switch when the switching driving control section 5 with the switching driving section 50 and the circuit housing section 55 is removed. / A manual switching device can be manufactured at low cost.

  In addition, in the said embodiment, although the switching of the single-phase 3-wire type electric circuit was demonstrated, the said automatic power supply switching device 1 is applicable also to the switching of a 3-phase 3-wire type electric circuit. Further, although the distributed power source is described as the storage battery, it may be a fuel cell or the like.

  1・・Automatic power supply switching device, 2・・Branch breaker, 3・・Leakage breaker, 4・・Switching opening/closing unit, 5・・Switching drive control unit, 10・・Housing, 10a・・11・・Operating handle, 12 ..First circuit connection terminal, 13...Second circuit connection terminal, 14...Third circuit connection terminal, 15...Movable contact, 16...Movable contactor, 17..Fixed contact, 21... Terminal, 33... Secondary side terminal, 50.. Switching drive section, 51.. Base, 52.. Handle hook section, 53.. Motor, 54.. Transmission mechanism section, 55.. Circuit accommodation section, 57 ..Disengagement sensor (disengagement detection means), 58..Photointerrupter (angle detection means) 61..Control circuit (control unit), 62..Power supply circuit, 63a..Circuit opening/closing switch, 63b..commercial power supply Voltage sensor, 64a... Circuit open/close switch, 64b... Battery power supply voltage sensor.

Claims (5)

A switching opening/closing unit that switches the power source of the load between the commercial power source and the distributed power source, a switching driving unit that drives the switching, and a control unit that monitors the power failure/recovery of the commercial power source and controls the switching driving unit. A power supply automatic switching device that has a power supply for the load to a distributed power supply when a power failure occurs in the commercial power supply and switches to a commercial power supply when the power is restored.
A circuit open/close switch and a voltage sensor are provided on both the power supply line from the commercial power supply circuit and the power supply line from the distributed power supply circuit to the power supply circuit of the control unit.
The control unit opens the circuit open/close switch on the distributed power supply side when detecting the voltage from both the voltage sensors, and closes the circuit open/close switch on the commercial power supply circuit side,
Further power automatic switching apparatus characterized by operating in the neutral position not connected to any of the switching-off unit. The switching opening/closing unit has an operation handle for manually switching the power source,
The switching drive unit has a handle hook unit that engages with the operation handle to operate the operation handle to switch the power supply,
The automatic power supply switching device according to claim 1, wherein the control unit controls the operation handle to switch the power supply. The switching opening/closing unit has a first circuit connection terminal to which a commercial power source is connected, a second circuit connection terminal to which a distributed power source is connected, and a third circuit connection terminal to which a load is connected,
The said 2nd circuit connection terminal and said 3rd circuit connection terminal are the copper bar type terminals which enable connection of the plug-in type terminal of a branch breaker or an earth leakage breaker, The said 2nd circuit connection terminal is characterized by the above-mentioned. Automatic power switching device. The switching opening/closing section is attached to a housing that is separable from the switching driving section and the control section.
The operation handle is arranged on the upper surface of the housing, the first circuit connecting terminal is arranged on the front surface side, and the second circuit connecting terminal and the third circuit connecting terminal are arranged on the rear surface,
The automatic power switching device according to claim 3, wherein the switching drive unit and the control unit are assembled to a side portion of the housing.   The automatic power supply switching device according to claim 4, wherein the handle hook portion, the switching drive portion, and the control portion are integrally formed and are detachably assembled to the housing.

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