JP6413113B2 - Grid interconnection system - Google Patents

Description

  The present invention relates to a grid interconnection system provided with a seismic relay.

  Grid-connected systems that can supply power to loads from commercial power sources and distributed power sources are expanding to ordinary homes with the spread of solar power generation devices and the like. In addition, in order to prepare for an anticipated large earthquake, various technologies for cutting off the power supply to the load when an earthquake occurs have been developed.

  For example, Patent Document 1 discloses a distribution board with a seismic isolation function that incorporates a seismic sensor in the distribution board and shuts off the main switch and branch switch when an earthquake is detected. Have been described. Patent Document 2 discloses that in order to prevent a fire from occurring due to an electric leakage at the time of an earthquake, when the seismic sensor detects an earthquake, the earth leakage circuit breaker is opened and power is supplied from the commercial power source to the load. Is stopped, and an emergency lamp is energized from the emergency distributed power supply.

  As described above, conventionally, power supply to a general load is interrupted when an earthquake occurs, but power supply to an emergency light or the like has been continued using a distributed power source. However, if the distribution system of the load was damaged by an earthquake, there was a possibility that an electric leakage would occur due to the energization of this emergency light, causing a fire or an electric shock.

JP-A-9-233623 JP 2006-166645 A

  Accordingly, an object of the present invention is to solve the above-mentioned conventional problems, and to provide a grid interconnection system in which energization is interrupted when an earthquake of a certain seismic intensity or more occurs, and the risk of fire and electric shock is eliminated.

The present invention made to solve the above problems is a system interconnection system that supplies power to a load from a commercial power source and a distributed power source, and includes a main switch and a branch switch connected to the commercial power source. A commercial power supply circuit, a distributed power supply circuit with a switch connected to the distributed power supply, and a seismic relay that outputs a signal to the switch and shuts off the switch when an earthquake is detected. Shin relay and trunk switch of the commercial power supply circuit is connected to a switch of the distributed power supply circuit is intended to allow blocking of these switches by outputting a signal to each system, and this The seismic relay includes a determination circuit that outputs a signal to the main switch of the commercial power circuit after outputting a signal to the switch of the distributed power circuit when the earthquake exceeding the first predetermined value is detected. It is as hereinbefore further the commercial power of A switching switch for switching the current path between the distributed power supply circuit unit circuit portion, and is characterized in that it has a switchable current path to a part of the load by the switching switch.

As claim 2, judgment circuits when it detects a predetermined seismic intensity or earthquakes, it is preferable that simultaneously output signals to the respective system. Further, as in claim 3 , it is preferable that the seismic relay includes a setting unit for setting an output condition to each system. Further, as in claim 4, the switch to which the seismic relay is connected is preferably a switch that shuts off the main circuit of each system.

According to the present invention, when the seismic relay detects an earthquake, the main switch of the commercial power supply circuit unit and the switch of the distributed power supply circuit unit can be shut off. Risk can be eliminated. Further, according to the inventions of claims 2 to 3 , according to the seismic intensity of the earthquake, after the main switch of the commercial power supply circuit part is shut off, the distributed power supply circuit part is shut off after a lapse of a certain time, Various controls, such as changing the way of shutting off the switch according to, can be performed. According to the invention of claim 4 , it is possible to completely prevent the risk of fire by shutting off all the energization to the load.

It is a schematic circuit diagram which shows the grid connection system of embodiment. It is a front view of the seismic relay of the embodiment. It is a perspective view of a seismic relay of an embodiment. It is a circuit block diagram inside an earthquake-sensitive relay. It is a schematic circuit diagram which shows a modification. It is a front view which shows the example of arrangement | positioning at the time of incorporating the system of this invention in the electricity distribution panel.

Embodiments of the present invention will be described below.
FIG. 1 is a schematic overall view showing a system interconnection system according to an embodiment, where 1 is a commercial power supply circuit unit and 2 is a distributed power supply circuit unit. The commercial power supply circuit unit 1 includes a main switch 4 connected to the commercial power supply 3 and a number of branch switches 5 connected to the secondary side thereof. It is the same as that in the prior art that energization to (not shown) is performed. A distributed power source breaker 6 is connected to the primary side of the main switch 4, which will be described later. As the main switch 4, an earth leakage breaker is used.

  The distributed power supply circuit unit 2 is connected to a distributed power supply 8 via a switch 7. The distributed power source 8 is a solar power generation device in this embodiment, but may be a fuel cell or other power source. The solar power generation device of embodiment is connected to the switch 7 via the connection box 9 and the power conditioner 10 as shown in the figure. The switch 7 functions as a grid connection breaker, and it is preferable to use an earth leakage breaker. Further, the power conditioner 10 is also connected to the above-described distributed power supply breaker 6 so that a reverse power flow from the distributed power supply 8 to the commercial power supply 3 can be performed.

Reference numeral 11 denotes a switching switch that is connected to the commercial power supply circuit unit 1 and the distributed power supply circuit unit 2 and switches energization paths to some loads 12. Here, an emergency light, an electric device or the like is connected as the load 12. The switching switch 11 itself is a well-known one, and the movable contact 13 can be switched between the commercial power supply side contact 14 and the distributed power supply side contact 15 to select from which power source the power is supplied to the load 12. It is. Reference numeral 16 denotes a neutral contact, and when the movable contact 13 is moved to the neutral contact 16, no power is supplied to the load 12 from any power source. The load 12 is an emergency load such as an emergency light, but is not necessarily limited thereto. The commercial power supply side contact 14 is connected to the secondary side of the first distributed power supply breaker 17.

  18 is a storage battery, which is connected to the secondary side of the second breaker 19 for the distributed power source and the power conditioner 10, can be charged from any power source, and can be discharged to the load connected to the branch switch 5. It is said. However, the storage battery 18 is outside the scope of the present invention and can be omitted.

  The grid interconnection system of the present invention includes a seismic relay 20. 2 and 3 show the appearance of the seismic relay 20 of the embodiment, and FIG. 4 shows the internal circuit configuration. As shown in FIG. 4, the seismic relay 20 has a seismic sensor 22, a determination circuit 23, a power supply unit 24, and the like housed in a case 21. In this embodiment, the power supply terminal 25 is a plug terminal, and as shown in FIG. 1, in the plug-in type distribution board, it can be incorporated in the row of branch switches 5, so that no extra space is taken up. Moreover, there exists an advantage that a power supply can be acquired, without connecting an electric wire etc. However, the structure of the power supply terminal 25 is not necessarily limited to this.

  The determination circuit 23 receives a signal from the seismic sensor 22 that detects shaking (S wave), determines whether the seismic intensity is equal to or higher than a certain level, and outputs a signal for shutting off the switch from the output terminal 26. Circuit. For example, when the value is greater than or equal to the first predetermined value (seismic intensity 5), the signal from the seismic sensor 22 is stored in the storage unit 27 and the signal is output after 3 minutes. Immediately outputs a signal.

  As indicated by a broken line in FIG. 1, the signal output from the seismic relay 20 when an earthquake occurs is sent to the main switch 4 of the commercial power supply circuit unit 1 and the switch 7 of the distributed power supply circuit unit 2. Shut off both circuits. In the present embodiment, when the determination circuit 23 detects a seismic intensity equal to or higher than the first predetermined value (seismic intensity 5), the determination circuit 23 outputs a signal to the switch 7 of the distributed power circuit 2 and then the commercial power circuit 1 A signal is output to the main switch 4 and the switches of each system are shut off. When a seismic intensity equal to or greater than the second predetermined value (seismic intensity 6) is detected, a signal is simultaneously output to the switches of each system and shut off. In this way, by connecting the output terminal 26 of the seismic relay 20 to the switches 4 and 7 that shut off the main circuit of each system, energization to each load is surely cut off, and a fire or the like due to leakage is prevented. be able to. The seismic relay 20 is incorporated in the commercial power supply circuit unit 1. However, even when the seismic relay 20 is added to an existing distribution board or the like, the main switch 4 of the commercial power circuit unit 1 is used. Similar determinations can be made to connect.

  The signal output from the seismic relay 20 is, for example, a pseudo leakage generation signal. If the switches 4 and 7 are used as an earth leakage breaker as in this embodiment, when the pseudo earth leakage generation signal is input, the earth leakage breaker determines that the earth leakage has occurred and the switches 4 and 7 interrupt the circuit. In addition, mechanical parts such as trip bars of the switches 4 and 7 are operated mechanically by a signal output from the seismic relay 20, or handles on the surfaces of the switches 4 and 7 are operated by an automatic operation device. It is also possible to trip the switches 4 and 7.

  As shown in FIG. 4, the seismic relay 20 includes a storage unit 27, a setting unit 28, a receiving unit 29, and the like. If a power failure occurs after the seismic wave is detected, the main switch will be shut off after 3 minutes. Therefore, the storage unit 27 has a function of storing the earthquake detection signal for at least 3 minutes. However, if the reset button 30 is pressed within 3 minutes, the storage in the storage unit 27 is reset.

  Further, when the power failure precedes the operation of the seismic relay 20 and the seismic relay 20 detects an earthquake wave within 8 seconds after the occurrence of the power failure, the switches 4 and 7 are not cut off. In this case, the storage unit 27 stores the earthquake detection signal and shuts off the switches 4 and 7 when power is restored.

  The setting unit 28 has a function of setting an output condition to each system. If a plurality of output terminals 26a and 26b are provided as in the embodiment, output conditions can be individually changed. For example, after an earthquake is detected, a signal is transmitted from the first output terminal 26a to the main switch 4 of the commercial power supply circuit unit 1, and after a predetermined time, a signal is transmitted from the second output terminal 26b to the switch 7 of the distributed power supply circuit unit 2. Can be set to send.

  When the seismic intensity is above a certain level, a signal is simultaneously transmitted to the first output terminal 26a and the second output terminal 26b, but when the seismic intensity is lower than that, a signal is transmitted only to the first output terminal 26a. The output method can be set. In addition, the trip time can be set so that a signal is transmitted one minute after each earthquake is detected at each output terminal. Furthermore, if the earthquake continues for several seconds or more, the sensing time can be set so that a signal is transmitted immediately after that. However, the setting unit 28 can be set only within the condition range of the determination circuit 23 described above.

  In FIG. 1, the output terminal 26 of the seismic relay 20 is connected to the main switch 4 of the commercial power supply circuit unit 1 and the switch 7 of the distributed power supply circuit unit 2, but as shown in FIG. Can also be connected to.

  In addition to the above, as shown in FIGS. 2 and 3, a display unit 31, a test button 32, and the like can be provided on the surface of the case 21 of the seismic relay 20. When the earthquake is detected, the display unit 31 notifies the earthquake by a lamp or voice. The test button 32 outputs a pseudo signal to the output terminal 26 so that the main switch 4 and the switch 7 operate reliably. It is to test whether or not to do.

  The above description has been made in the case where the seismic sensor 22 of the seismic relay 20 detects the occurrence of an earthquake. However, as shown in FIG. It is also possible to send the signal to 23. When the occurrence of an earthquake with a certain seismic intensity or more is predicted, the determination circuit 23 immediately outputs a signal to the output terminal 26. Alternatively, when the prediction circuit received by the receiving unit 29 and the seismic intensity actually detected by the seismic sensor 22 are combined with the determination circuit 23, a safer and more reliable response is possible.

  FIG. 6 shows an arrangement example when the present invention is incorporated in a distribution board. The above-described numbers are assigned to the respective components, and the description thereof is omitted. However, in FIG. 6, the seismic relay 20 is connected not to the position of the branch switch 5, but to the end of the bus bar connected to the main switch 4, but its function is the same as described above.

  As described above, according to the present invention, when an earthquake of a certain seismic intensity or more occurs, the power supply to the commercial power supply circuit unit 1 and the distributed power supply circuit unit 2 is cut off to eliminate the risk of fire and electric shock. It is possible to provide a system.

DESCRIPTION OF SYMBOLS 1 Commercial power supply circuit part 2 Distributed power supply circuit part 3 Commercial power supply 4 Main switch 5 Branch switch 6 Distributed power supply breaker 7 Switch 8 Distributed power supply 9 Connection box 10 Power conditioner 11 Switching switch 12 Load 13 Movable contact 14 Commercial power source side contact 15 Distributed power source side contact 16 Neutral contact 17 First distributed power source breaker 18 Storage battery 19 Second distributed power source breaker 20 Seismic relay 21 Case 22 Seismic sensor 23 Judgment circuit 24 Power unit 25 Power source terminal 26 Output terminal 27 Storage unit 28 Setting unit 29 Reception unit 30 Reset button 31 Display unit 32 Test button

Claims (4)

A grid-connected system that supplies power to a load from commercial power and distributed power,
A commercial power supply circuit unit with a main switch and a branch switch connected to the commercial power supply, a distributed power supply circuit unit with a switch connected to the distributed power supply, and a signal to the switch when an earthquake is detected Equipped with a seismic relay that outputs and shuts off the switch,
This seismic relay is connected to the main switch of the commercial power supply circuit section and the switch of the distributed power supply circuit section, and these switches can be shut off by outputting a signal to each system.
In addition, the seismic relay outputs a signal to the main switch of the commercial power supply circuit unit after outputting a signal to the switch of the distributed power supply circuit unit when an earthquake of the first predetermined value or more is detected. With
Furthermore, a switching switch for switching the energization path between the commercial power supply circuit unit and the distributed power supply circuit unit is provided, and the energization path to some loads can be switched by this switching switch. Grid interconnection system. 2. The grid interconnection system according to claim 1 , wherein the determination circuit outputs a signal simultaneously to each of the systems when an earthquake having a second predetermined value or more is detected . The grid interconnection system according to claim 1 or 2, wherein the seismic relay includes a setting unit for setting an output condition to each system. 2. The grid interconnection system according to claim 1, wherein the switch to which the seismic relay is connected is a switch that cuts off a main circuit of each system.

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