JP6273503B2 - Grid interconnection system and switching switch - Google Patents

Description

  The present invention relates to a grid interconnection system capable of switching a power supply system to a load between a commercial power supply and a distributed power supply, and a switching switch used in the grid interconnection system.

  When a distributed power system such as a solar cell, a fuel cell, or a battery and a commercial power system are used in combination, a switch may be arranged between the load and the energized system as shown in Patent Document 1 Has been done. When the commercial power system fails, power is supplied from the distributed power system to the load. However, if the current from the distributed power system flows back to the commercial power system, there is a risk of electric shock from workers who are recovering from the power failure. The switch installed between the commercial power supply system and the load is opened.

  Further, in Patent Document 2, in order to prevent a fire from occurring when an earthquake occurs, the earth leakage breaker is opened when the seismic sensor detects an earthquake, and the load from the commercial power supply to the load is detected. It is described that the energization is stopped and the energization from the emergency power supply to the emergency light is performed.

  As described above, in the past, in the event of an emergency, the power supply from the commercial power supply is cut off, and the power supply from the distributed power supply to the emergency light or the like is ensured. However, when the load wiring system was damaged by an earthquake, this energization caused a leakage, which could cause a fire or electric shock.

JP 2011-223852 A JP 2006-166645 A

  Accordingly, the object of the present invention is to solve the above-mentioned conventional problems, and to switch the power supply system to the load between the commercial power source and the distributed power source, and to ensure the occurrence of a fire or the like due to a leakage during an earthquake. The present invention is to provide a grid interconnection system that can be prevented and a switching switch used in the grid interconnection system.

In order to solve the above problems, the grid interconnection system of the present invention is a grid interconnection system in which a commercial power source and a distributed power source are connected to a switching switch so that a current path of a power distribution system to a load can be switched. An automatic operation unit for performing switching operation of the electric circuit of the switching switch, and an earthquake signal is input to the automatic operation unit, and switching to the distributed power source side of the switching switch by the earthquake signal is disabled. To do.

As in claim 2, the earthquake signal can be a signal from a seismic sensor or a signal from a communication device to which earthquake information is input. Further, as in claim 3, the switching switch is provided with an open position that is not connected to either the commercial power source or the distributed power source, and the electric circuit of the switching switch is opened by an earthquake signal from the seismic sensor or communication device. It can be set as the structure switched to a position. Further, as in claim 4, a switch that can cut off the commercial power supply is arranged on the primary side of the switching switch, and this switch is shut down by an earthquake signal from a seismic sensor or a communication device. It can be set as the structure which makes an electric circuit the commercial power source side .

The invention of claim 5 and below relates to a switching switch used in the above-described grid interconnection system, and includes a commercial power supply connection part, a distributed power supply connection part, and a load connection part, and can switch an electric circuit of a power distribution system to a load. The switch is equipped with a seismic sensor that detects earthquakes and an automatic operation unit that switches electrical circuits, and the seismic signal from the seismic sensor is input to the automatic operation unit to the distributed power supply connection side. This is characterized in that the changeover is disabled. Further, as in claim 6 , the switching switch is provided with an open position where it is not connected to either the commercial power source connection part or the distributed power source connection part, and the electric circuit of the switching switch is detected by an earthquake signal from the seismic sensor. Can be switched to the open position .

  Since the grid interconnection system of the present invention can switch the power circuit of the power supply system to the load between the commercial power supply and the distributed power supply, the power supply to the load is possible even when the commercial power supply system fails. . Moreover, a seismic sensor for detecting an earthquake is provided, and switching to the distributed power source side of the switching switch is disabled by a signal from the seismic sensor, and the seismic information is input to the communication device as in claim 2 to perform communication. Since switching from the switching switch to the distributed power supply side is disabled by a signal from the device, it is possible to reliably prevent the occurrence of fire, electric shock, etc. in the event of an earthquake.

  As the switching switch, a switch having a structure having an open position (neutral position) as described in claim 3 or a switch having a structure without an open position as described in claim 4 can be used. it can. In the latter case, a switch that can cut off the commercial power supply is arranged on the primary side of the switching switch.

According to invention of Claim 1 , it can be set as the structure provided with the automatic operation part which performs switching operation of the electric circuit of a switching switch. If a power failure occurs due to a cause other than an earthquake, automatic operation to the distributed power supply side is possible.In the event of an earthquake, automatic operation to the distributed power supply side is disabled. Occurrence can be reliably prevented.

According to the fifth aspect of the present invention, the switching switch has a structure in which switching to the distributed power source side of the switching switch is disabled by the input of a signal from the communication device and the power supply to the load is cut off. It is possible to reliably prevent the occurrence of fire or electric shock at the time of occurrence. According to the invention of claim 6 , a structure having an open position (neutral position) can be used. According to the first aspect of the present invention, it is possible to provide a structure including an automatic operation unit that performs a switching operation of the electric circuit of the switching switch. If an automatic operation to the distributed power source side is disabled in the event of an earthquake, it is possible to reliably prevent the occurrence of fire, electric shock, etc. in the event of an earthquake.

It is a wiring system diagram showing the first embodiment. It is structure explanatory drawing of a switching switch, and shows a neutral position. It is structure explanatory drawing of a switching switch, and shows the state by which the handle was operated. It is a wiring system diagram which shows the modification of 1st Embodiment. It is a wiring system diagram showing a second embodiment. It is a wiring system figure showing a 3rd embodiment. It is detail drawing of the principal part of 3rd Embodiment. It is a wiring system figure showing a 4th embodiment. It is a wiring system diagram showing a fifth embodiment. It is a wiring system figure showing a 6th embodiment. It is a wiring system figure showing a 7th embodiment.

(First embodiment)
FIG. 1 is a wiring system diagram showing a first embodiment of the present invention, wherein 1 is a distribution board, 2 is a main breaker disposed therein, 3 is a secondary side (load side) of the main breaker 2 A plurality of branch breakers connected. The commercial power supply 4 is connected to the primary side (power supply side) of the main breaker 2 and power is supplied to each load (not shown) via the branch breaker 3 as in the conventional case.

  In addition to the main breaker 2 described above, a distributed power source breaker 5 is formed on the distribution board 1. The distributed power circuit breaker 5 is formed with a first distributed power circuit breaker 5a and a second distributed power circuit breaker 5b. A distributed power source 6 is connected to the first distributed power source breaker 5a. As the distributed power source 6, a solar cell, a fuel cell, a battery, or the like can be used. In this embodiment, the distributed power source 6 is a solar cell, and is used for the first distributed power source via the power conditioner 7 and the storage battery 8. Connected to the breaker 5b and the switching switch 9 and supplied from the storage battery 8 to the general load connected to the branch breaker 3, and also supplied with power to the switching switch 9 side or charged with the storage battery 8 from the commercial power source 4 side ing. Further, the power conditioner 7 is formed so as to allow a reverse power flow from the power supply 7 to the commercial power supply 4 via the second distributed power supply breaker 5a.

  Reference numeral 9 denotes a switching switch. The switch 9 of this embodiment has a structure with an open position (neutral position), and a specific structure thereof is shown in FIG. In FIG. 2, reference numeral 10 denotes a casing of the switching switch 9, reference numeral 11 denotes a commercial power supply connection section provided with a fixed contact 12, and reference numeral 13 denotes a distributed power supply connection section provided with a fixed contact 14. A handle 15 is pivotally supported by a shaft 16 at the center of the housing 10. Movable contacts 19 and 20 are held under the handle 15, and movable contacts 21 and 22 are formed at the lower ends of the movable contacts 19 and 20. By operating the handle 15 as shown in FIG. 3, the load connection unit 28 and the commercial power supply connection unit 11 are brought into conduction, or the handle 15 is tilted in the reverse direction, whereby the load connection unit 28 and the distributed power supply connection unit 13 are connected. And the load is energized from the commercial power source 4 or the distributed power source 6. An earth leakage switch 60 is formed on the primary side of the distributed power connection 13 of the switching switch 9.

  The switching switch 9 shown in FIG. 1 has the above-described structure, and the lead wire 29 drawn from one branch breaker 3 is connected to the commercial power supply connection portion 11 and the load 30 is connected to the load connection portion 28. It shows the state that was done. Although the distributed power source 6 is connected to the distributed power source connection portion 13 through the conductive wire 31, the load 30 is not energized through the conductive wire 31 in the state of FIG. 1. The load 30 is an emergency load such as an emergency light that is desired to be energized even when the commercial power source 4 is powered off, but is not necessarily limited thereto.

  As shown in FIG. 1, a seismic sensor 32 is attached to the switch 9. This seismic sensor 32 is a sensor for detecting a swing width, impact, or acceleration exceeding a certain level. When an earthquake is detected, an earthquake signal is input to the switch 9 and the electric circuit to the distributed power source connection 13 side is input. This is for disabling switching and shutting off the power supply to the load 30.

  First, in the normal state shown in FIG. 1, power is supplied from the commercial power supply 4 to a general load (not shown) and the load 30. When the commercial power supply 4 fails, the switching switch 9 is switched to connect the load connection unit 28 and the distributed power supply connection unit 13, and the load 30 is energized from the distributed power supply 6. For this reason, emergency lights can be turned on even during power outages.

  However, when the seismic sensor 32 detects an earthquake, the switch 9 is switched to the open position block 25 shown in FIG. As a result, the load 30 is completely disconnected from any power source, and the power supply to the load 30 is cut off. When an earthquake is detected in this way, an earthquake signal is input to the switching switch 9 to disable switching of the power supply to the distributed power supply connection 13 side, and the seismic sensor 32 that cuts off the power supply to the load 30 is switched to the switching switch 9. Since it is attached to, it is possible to reliably prevent the occurrence of fires or electric shocks in the event of an earthquake.

  In the above embodiment, the seismic sensor 32 is built in the switching switch 9 as shown in FIG. 1, but the seismic sensor 32 is arranged separately from the switching switch 9 as shown in FIG. Also good. In addition, after confirming safety after that, the switching switch 9 can be operated manually or the like, the energization to the load 30 can be resumed and the emergency light or the like can be turned on for convenience of evacuation or the like.

  Moreover, in the said embodiment, although the earthquake sensor 32 detected an earthquake and the switching switch 9 was made into the open position, when the earthquake was detected, the main breaker 2 and distributed power supply were detected from the earthquake sensor 32. It is preferable that a seismic signal is similarly input to the circuit breaker 5 and the like to be cut off. In addition, each of the main breaker 2 and the distributed power source breaker 5 may be provided with a seismic sensor to be shut off, or each seismic sensor may be linked.

(Second Embodiment)
FIG. 5 is a wiring system diagram showing a second embodiment of the present invention. In this embodiment, a switch having a structure without an open position (neutral position) is used as the switching switch 9. Other configurations are the same as those of the first embodiment. FIG. 5 shows a normal state, in which the load 30 is energized from the commercial power supply 4 via the branch breaker 3. When the commercial power supply 4 has a power failure, the switching switch 9 is switched and the load 30 is energized from the distributed power supply 6. However, when the seismic sensor 32 detects an earthquake, the seismic signal is input to the main breaker 2 provided on the primary side of the switching switch 9 or the branch breaker 3 provided on the primary side of the switching switch 9 to be cut off and switched. The switch 9 is on the commercial power supply side as shown in FIG. 5 and not on the distributed power supply side. Since the main breaker 2 or the branch breaker 3 is cut off, the load 30 is disconnected from any power source, and energization to the load 30 is completely cut off.

  Here, when an earthquake is detected by the seismic sensor 32, an automatic operation unit for switching the electric circuit to the open position or the commercial power source 4 side is provided in order to cut off the power supply from the distributed power source 6 to the load 30. As an automatic operation unit, a structure in which an automatic operation device 40 that is operated by switching an operation unit such as a handle 15 or an operation button formed on the outer surface of the switching switch 9 as described below is mechanically arranged is disposed adjacently. Such an automatic operation device 40 may be arranged or integrated in the switching switch 9, or may not be mechanically operated but may have a structure such as a control device that incorporates a control circuit and switches an electric circuit. . When an earthquake is detected by the seismic sensor, an earthquake signal is input to the automatic operation unit so that the switching switch 9 cannot be switched to the distributed power source connection unit 11.

(Third embodiment)
In the third embodiment shown in FIGS. 6 and 7, the automatic operation device 40 is disposed adjacent to the switching switch 9, and the switching operation is performed by automatically operating the handle 15 (FIG. 2) of the switching switch 9. It was made to let you. This automatic operation device 40 is provided with a sensor 41 capable of detecting current or voltage on the primary side of the main breaker 2, and the determination unit 42 determines the presence or absence of a power failure. When it is determined that there is a power failure, the operation unit 43 operates the handle 15 of the switching switch 9 to mechanically switch to the distributed power source side.

  The automatic operation device 40 is formed with a seismic sensor 32, and when an earthquake is detected, the power supply to the load 30 is cut off. Specifically, when the switching switch 9 is provided with an open position, the switching switch 9 is switched to the open position as in the first embodiment so that the load 30 is not energized. To. When the switching switch 9 does not have an open position, the main breaker 2 provided on the primary side of the switching switch 9 is shut off as in the third embodiment, and the switching switch 9 The handle 15 is positioned on the commercial power supply side so that the load 30 is not energized.

(Fourth embodiment)
In the fourth embodiment shown in FIG. 8, the switching switch 9 is arranged on the primary side of the main breaker 2. FIG. 8 shows a normal state, and the commercial power supply 4 is energized to the load 30. When the commercial power supply 4 has a power failure, the load switch 30 and the main breaker 2 are energized from the distributed power supply 6 by switching the switch 9. However, when the seismic sensor 32 detects an earthquake, the switch 44 provided on the primary side of the switching switch 9 is shut off, and the switching switch 9 is switched to the commercial power source side as shown in FIG. I do not. Since the switch 44 is cut off, the load 30 is disconnected from any power source, and energization to the load 30 is completely cut off.

(Fifth embodiment)
In the present embodiment, as shown in FIG. 9, the load 30 is normally energized from the distributed power source 6. Even when a power failure occurs, the load 30 is energized with the distributed power supply connection portion 13 in the state. However, when the seismic sensor 32 detects an earthquake, the seismic sensor 32 is switched to the commercial power supply 11 side so that the main breaker 2 or the branch breaker 3 formed on the primary side of the switching switch 9 is cut off and the load 30 is not energized. To do. Then, after switching to the commercial power source connection unit 11 side, switching to the distributed power source connection unit 13 side is disabled, so that the load 30 cannot be energized from the distributed power source 6 side. In the case of a switching switch having an open position, the seismic sensor 32 may switch to the open position when an earthquake is detected.

(Sixth embodiment)
In this embodiment, as shown in FIG. 10, an earthquake detection signal such as an earthquake detection signal from the seismic sensor 32, an electric current / voltage value, etc. as an earthquake signal is determined as an earthquake when a certain condition is met. Earthquake information such as an earthquake early warning is input to a communication device 50 such as an information processing device, the communication device 50 outputs a signal such as a switching / cutoff command to the switching switch 9, and the switching switch 9 receives a signal. As a result, switching to the distributed power source connection unit 13 side is disabled. The communication device 50 is arranged outside the board, but may be provided inside the board. In addition, about the thing of the structure where the switching switch 9 was provided with the open position, the switching switch 9 was made into the open position by the input signal from a communication apparatus, and the thing of the structure which is not equipped with an open position of the switching switch 9 The primary side main circuit breaker 2 or the branch circuit breaker 3 is shut off, and the commercial power supply connection unit 11 is provided. Further, an automatic operation device 40 for operating the operation unit of the switching switch 9 or an automatic operation unit such as a control circuit is provided to enable switching operation.

(Seventh embodiment)
In the present embodiment, as shown in FIG. 11, a seismic sensor 32 is provided inside the switching switch 9, and when an earthquake is detected by the seismic sensor 32, the shaft 16 is supported by the operation of the handle 15. The mechanical mechanism 15a that operates the handle 15 and the movable contacts 19, 20 is operated to disable switching to the distributed power supply connection 13 side, and the load connection 28 and the distributed power supply connection 13 cannot be connected. It is what. Further, the seismic sensor 32 may be formed as an accessory device on the outer periphery of the switching switch 9. In the present embodiment, the handle 15 and the mechanical mechanism 15a are operated. However, the fixed contact 12 and the movable contact 21 may be operated in parallel. Note that the switching switch 9 has a structure with an open position, and is configured to switch to the open position by a signal from the seismic sensor 32 so that switching to the distributed power supply connection unit 13 side is impossible. In addition, an automatic operation unit such as a control circuit is formed as means for performing the switching operation in this way.

  In any of the above-described embodiments, when an earthquake is detected by the seismic sensor 32 or when earthquake information is input from the communication device 50, energization to the load 30 from the distributed power source 6 is performed by those earthquake signals. Can be cut off to prevent fire and electric shock. However, after confirming safety, it is possible to operate the switching switch 9 manually or the like to restart the energization of the load 30 and turn on the emergency light or the like for convenience of evacuation. In this case, it is possible to prevent the switching switch 9 from being operated within a certain period of time after the earthquake is detected.

1 Distribution Board 2 Main Breaker 3 Branch Breaker 4 Commercial Power Supply 5 Distributed Power Breaker 5a First Distributed Power Breaker 5b Second Distributed Power Breaker 6 Distributed Power Supply 7 Power Conditioner 8 Storage Battery 9 Switch Switch 10 Switch Open / Close Case 11 Commercial power connection 12 Fixed contact 13 Distributed power connection 14 Fixed contact 15 Handle 15a Mechanical mechanism 16 Axis 19 Movable contact 20 Movable contact 21 Movable contact 22 Movable contact 25 Open position block 28 Load connection 29 Conductor 30 Load 31 Conductor 32 Seismic sensor 33 Switch 40 Automatic operation device 41 Sensor 42 Determination unit 43 Operation unit 44 Switch 50 Communication device 60 Earth leakage switch

Claims (6)

In a grid interconnection system that connects a commercial power source and a distributed power source to a switching switch and can switch a power circuit of a power distribution system to a load.
Equipped with an automatic operation part that performs switching operation of the electric circuit of the switching switch,
A system interconnection system characterized in that an earthquake signal is input to the automatic operation unit to disable switching of the switching switch to the distributed power source side.   2. The grid interconnection system according to claim 1, wherein the earthquake signal is a signal from a seismic sensor or a signal from a communication device to which earthquake information is input.   3. The switching switch is provided with an open position that is not connected to any of a commercial power source and a distributed power source, and the electric circuit of the switch switch is switched to the open position by an earthquake signal. Grid connection system described in 1.   2. A switch capable of shutting off the commercial power supply is arranged on the primary side of the switching switch, the switch is shut off by an earthquake signal, and the electric circuit of the switching switch is on the commercial power supply side. The grid connection system according to claim 2. In a switching switch equipped with a commercial power supply connection part, a distributed power supply connection part and a load connection part, and capable of switching the electric circuit of the power distribution system to the load,
Equipped with a seismic sensor that detects earthquakes and an automatic operation unit that switches electric circuits, and the seismic signal from the seismic sensor is input to the automatic operation unit, making it impossible to switch to the distributed power supply connection side. Switching switch characterized by. 6. The switching opening and closing according to claim 5, further comprising an open position that is not connected to any of the commercial power supply connection portion and the distributed power supply connection portion, and the electric path to the load is switched to the open position by an earthquake signal from the seismic sensor. vessel.

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