JP6704282B2 - Distribution board with seismic isolation function - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distribution board with a seismic isolation function that includes an seismic relay and that allows a breaker to shut off when an earthquake occurs.

Most of the conventional distribution boards with seismic isolation function cut off immediately when an earthquake is detected, but if they are immediately interrupted, lighting, telephones, and other devices that require a power source are also immediately affected by the earthquake. There was a problem that the equipment used by residents when they evacuated became unusable. Therefore, there is proposed a distribution board equipped with a control unit (earthquake-sensitive relay) that is not immediately shut down when an earthquake occurs but is shut down at a predetermined timing after the earthquake occurs, for example, when a power failure occurs ( For example, see Patent Document 1).
On the other hand, breakers with seismic function have been proposed. For example, Patent Document 2 discloses a breaker that has a built-in timer and that performs a breaking operation after a lapse of a certain time after detecting an earthquake.

JP, 9-215178, A JP-A-9-233682

The distribution board, which is configured to be shut off at a predetermined timing after the occurrence of the earthquake, can be configured so as not to shut off when evacuating, so that smooth evacuation is possible. However, for some electric devices, it is desirable to immediately turn off the power when an earthquake occurs. Further, among them, there are some that should be shut off even in the case of a relatively small shake, and some should not be shut off immediately in the case of a relatively small shake.
For example, it is desirable to cut off the power supply of equipment that is not fixed like an electric stove and may move due to an earthquake even with a relatively small seismic intensity. On the other hand, it is unlikely that a fire will occur even if the electric heating equipment, such as an electric stove, that is firmly fixed, is not shut off unless the seismic intensity is relatively large. Therefore, even in the case of immediate shutoff, if the seismic intensity is taken into consideration, the convenience will be further enhanced.
In order to meet such a requirement, it is possible to provide each branch breaker with a seismic sensing function as disclosed in Patent Document 2, but it becomes costly because the existing breaker cannot be used. I will end up.

Therefore, in view of the above problems, the present invention delays the main earth leakage breaker when an earthquake occurs by using an earthquake-sensing relay, and immediately shuts off the existing branch earth leakage breaker. The purpose is to provide a distribution board with functions.

In order to solve the above-mentioned problems, the invention of claim 1 has a main leakage breaker to which a lead-in wire of a single-phase three-wire type electric line is connected, and a plurality of branch breakers connected to a secondary side electric line of the main leakage breaker. It is a distribution board with seismic isolation function equipped with the first seismic relay that shuts off the main earth leakage breaker at a predetermined timing after it is installed and detects an earthquake with a specific seismic intensity or more. When an earthquake is detected, a plurality of second seismic relays for shutting off the branch breaker immediately or before the main earth leakage breaker are provided, and the second seismic relay has a pseudo earth leakage output section for generating pseudo earth leakage and at least 1 The two second seismic relays generate pseudo-leakage with a seismic intensity different from that of the other second seismic relays, and the branch breaker that cuts off in response to the seismic movement of the second seismic relay is a branch earth leakage breaker. And
According to this configuration, when the first seismic relay detects an earthquake, the main earth leakage breaker performs a delay cutoff operation, and when the second seismic relay detects an earthquake, a specific branch breaker shuts off immediately or before the main earth leakage breaker. To do. Therefore, both early shutoff and delayed shutoff can be realized, and a shutoff operation having both convenience and safety can be performed. Further, since the existing branch leakage breaker can be used as the branch breaker that is quickly shut off, the cost can be reduced.
In addition, even for an electric device that is set to shut off quickly, the breaking seismic intensity can be set according to the type of the electric device, which is even more convenient.

According to the invention of claim 2, a main earth leakage breaker to which the service wire of the single-phase three-wire type electric line is connected, and a plurality of branch breakers connected to the secondary side electric line of the main earth leakage breaker are assembled, and a seismic intensity of a specific seismic intensity or more is provided. When an earthquake is detected, it is a distribution board with a seismic isolation function that has a first seismic relay that shuts off the main earth leakage breaker at a predetermined timing after that. Alternatively, a second seismic-sensing relay for shutting off the main earth-leakage breaker is provided, and the second seismic-sensing relay has a pseudo earth-leakage output section that generates pseudo earth-leakage and receives the seismic-sensing operation of the second seismic relay. The branch breaker that performs the cutoff operation is a branch leakage breaker, and the branch leakage breaker is a three-terminal breaker, and the primary side terminal of the three-terminal breaker is connected to each phase of the single-phase three-wire circuit, The secondary side terminal is characterized in that two terminals out of three terminals are used for connection of the branch electric circuit, and the other one terminal is connected to the pseudo leakage output section .
According to this configuration, if the first seismic relay detects an earthquake, the main earth leakage breaker performs a delay cutoff operation, and if the second seismic relay detects an earthquake, a specific branch breaker shuts off immediately or before the main earth leakage breaker. To do. Therefore, both early cutoff and delayed cutoff can be realized, and a cutoff operation having both convenience and safety can be performed.
In addition, since the second seismic relay is connected to the terminal of the branch leakage breaker, there is no need to connect it to the branch circuit, and there is no need to provide a separate terminal block.

According to a third aspect of the present invention, in the configuration according to the first aspect , the branch earth leakage breaker to which the pseudo earth leakage output portion of the second seismic relay is connected is a three-terminal breaker, and the primary side terminal of the three-terminal breaker is While being connected to each phase of the single-phase three-wire type electric circuit, two of the three terminals on the secondary side are used to connect the branch electric circuit, and the other one terminal is connected to the pseudo leakage output section. It is characterized by
According to this configuration, since the second seismic-sensing relay is connected to the terminal of the branch earth leakage breaker, it is not necessary to connect it to the branch electric circuit and it is not necessary to separately provide a terminal block.

According to the present invention, if the first seismic relay detects an earthquake, the main earth leakage breaker performs a delay cutoff operation, and if the second seismic relay detects an earthquake, a specific branch breaker shuts off immediately or before the main earth leakage breaker. To do. Therefore, both early shutoff and delayed shutoff can be realized, and a shutoff operation having both convenience and safety can be performed. Further, since the existing branch leakage breaker can be used as the branch breaker for shutting off quickly, the cost can be reduced.

It is a structure explanatory view showing an example of the distribution board with a seismic isolation function concerning the present invention. It is a circuit block diagram of an earthquake-sensitive relay.

Hereinafter, embodiments embodying the present invention will be described in detail with reference to the drawings. FIG. 1 is a structural explanatory view showing an example of a distribution board with a seismic isolation function according to the present invention, which is a single-phase three-wire type electric line consisting of two voltage phases L1 and L2 and a neutral wire N ( Hereinafter, it is simply referred to as “electric circuit”.) A distribution board 10 forming a plurality of branch electric circuits from A is shown. In FIG. 1, 1 is a main earth leakage breaker (main ELB) with an earth leakage interruption function, 2 and 3 are branch breakers, 4 is a first seismic relay, and 5 (5a,... 5n) is a second seismic relay. is there. However, the branch breaker 2 is a branch breaker having no leakage break function, and the branch breaker 3 is a branch leakage breaker having a leakage break function (first branch ELB3a, second branch ELB3b,... Nth branch ELB3n).

The lead-in wire (primary-side electrical path A1) of the electrical path A is connected to the primary side of the master ELB1, and a plurality of branch electrical paths B1 from the secondary-side electrical path A (secondary-side electrical path A2) via branch breakers 2 and 3. , B2 (B2a, B2b... B2n) are formed.
Then, the first seismic relay 4 is connected so as to sandwich the main ELB1, and the second seismic relay 5 is connected so as to sandwich the branch ELB3.

The branch ELB3 is a three-terminal type earth leakage breaker, and three primary side terminals are connected to each of the three secondary side electric paths A2, and two of the three secondary side terminals are connected to the branch electric path B2. It is used and the remaining one terminal is connected to the second seismic relay 5. The branch breaker 2 is a two-terminal breaker, and the primary side is connected to any two of the three (selected between 200V output and 100V output).

FIG. 2 shows a circuit block diagram of the first seismic relay 4 and the second seismic relay 5, both of which have the same configuration. A seismic sensor 41 that senses an earthquake and outputs a signal corresponding to a shake, a pseudo-earthleakage output unit 42 that outputs a pseudo-earthleakage, a time setting unit 43 that sets a timing (delay time) for outputting a pseudo-earthleakage, and a pseudo-earthleakage. A seismic intensity setting unit 44 that sets the seismic intensity to be generated, an earthquake sensitive relay CPU 45 that determines the seismic intensity by receiving shaking information from the seismic sensor 41, and controls the pseudo earth leakage output unit 42 is provided.
The time setting unit 43 can set, for example, immediate three steps of 1 minute and 3 minutes, and the seismic intensity setting unit 44 can set three steps of 5 weak, 5 strong, and 6 weak.

The seismic relays 4 and 5 are specifically connected as follows. As shown in FIG. 1, the pseudo earth leakage output unit 42 of the first seismic-sensing relay 4 is connected to the primary side electric circuit A1 by a connection line S1. Then, the connection line S2, which is an input line for generating pseudo-leakage, is connected to the neutral line N of the secondary side electric circuit A2, and the first seismic relay 4 is connected so as to sandwich the trunk ELB1. ..
By this connection, when an earthquake with a seismic intensity equal to or higher than the set seismic intensity occurs, a current (pseudo-leakage current) flows through the connection lines S2 and S1 so as to bypass the master ELB1 and operates as if a leak occurred in the electric circuit A, The master ELB1 operates to shut off.

On the other hand, the pseudo earth leakage output unit 42 of the second seismic relay 5 is connected to the branch electric circuit B2 by the connection line S3. Then, the connection line S4, which is an input line for generating pseudo leakage, is connected to the neutral line N of the secondary side electric circuit A2, and the second seismic relay 5 is connected so as to sandwich the branch ELB3. ..
By this connection, when an earthquake with a seismic intensity equal to or higher than the set seismic intensity occurs, a current (pseudo-leakage current) flows through the connection lines S4 and S3 so as to bypass the branch ELB3, and the branch circuit B2 operates as if a leak had occurred. , The branch ELB3 operates to shut off.
The seismic relays 4 and 5 both have a power supply unit (not shown) to which power is supplied from the secondary electric circuit A2 of the main ELB1 and are connected to the neutral line N of the power supply unit. The power supply line is also used as the connection lines S2 and S4.

The operation of the distribution board with the seismic isolation function configured as described above is as follows. When the seismic-sensing relays 4 and 5 have the above-described settings, the first seismic-sensing relay 4 is set to operate in a delayed manner, and the second seismic-sensing relay 5 is set to operate in an instant. For example, the first seismic-sensing relay 4 is used with a set time (delay time) of 3 minutes and the seismic intensity setting of, for example, seismic intensity 5 strong, while the second seismic relay 5 sets the set time to immediate and seismic intensity setting mainly to seismic intensity 5 strong. It is used in the seismic intensity setting including before and after.
And the 2nd seismic-sensing relay 5 is installed according to the number of the branch electric circuits which need to be interrupted immediately, and the branch ELB3 is used for the branch electric circuit B2.

Specifically, for example, when an electric device that generates heat such as an electric stove that is not fixed is connected to the end of the branch electric circuit B2a that is branched by the first branch ELB3a illustrated in FIG. Set the seismic intensity of the seismic relay 5a to, for example, 5 and make it smaller than the seismic intensity of the main ELB1, and connect a firmly fixed electric heating device such as an electric stove to the end of the branch electric circuit B2b branched by the second branch ELB3b. In this case, the seismic intensity set for the second seismic relay 5b to be connected can be set to, for example, a little less than 6 to make the seismic intensity larger than the seismic intensity set for the master ELB1.

With such a setting, the branch electric circuit B2a to which the electric device is connected immediately after the occurrence of the earthquake, which is better to be shut off even with a relatively small shaking, can shut off the branch ELB3a with a smaller seismic intensity than the main ELB1. Yes, it is safe and preferable.
On the other hand, even if there is an electric device that should be immediately shut off when an earthquake occurs, in the case of the branch electric circuit B2b to which a fixed and stable electric heating device is connected, the main trunk unless a relatively large shake occurs. It suffices to deal with the delay cutoff of the ELB1, and frequent cutoff operations can be avoided.

Thus, when the first seismic-sensing relay 4 senses an earthquake, the master ELB 1 performs a delay shutoff operation at a predetermined timing, and when the second seismic-sensing relay 5 senses an earthquake, a specific branch breaker 3 shuts off immediately. Therefore, both immediate cutoff and delayed cutoff can be realized, and a cutoff operation having both convenience and safety can be performed. Further, the existing branch ELB can be used as the branch breaker 3 for immediate shutoff, and the seismic relays 4 and 5 having one pseudo earth leakage output section 42 can be constructed at low cost because the cost is low.
Further, even if the electric device is set to be shut off immediately, it can be shut down with the seismic intensity according to the type of the electric device, which is more convenient, and the second seismic relay 5 is connected to the terminal of the branch ELB3. Therefore, it is not necessary to connect to the branch circuit B2, and it is not necessary to separately provide a terminal block.

In the above embodiment, the three-terminal leakage breaker is used as the branch breaker 3, but a two-terminal leakage breaker may be used, in which case the secondary side voltage phase is branched and the second Connected to seismic relay 5.
Also, the second seismic relay 5 immediately generates a pseudo-leakage when it detects an earthquake, but depending on the connection load, it may be sufficient to shut off the branch ELB3 before the main ELB1 instead of immediately. In such a case, it may be delayed by 1 minute, for example.
Further, although the first seismic relay 4 and the second seismic relay 5 have the same configuration, the second seismic relay 5 that operates the branch ELB 3 may have a fixed setting without the time setting unit 43.
Further, although the branch breaker to which the first seismic relay 4 or the second seismic relay 5 is not connected is the divided breaker 2 that does not have the leakage interruption function, the branch ELB 3 may of course be used.

1・・Main leakage breaker, 2・・Branch breaker, 3・・Branch leakage breaker (branch breaker), 4・・First seismic relay, 5・・Second seismic relay, 41・・Seismic sensor, 42 ..Pseudo-leakage output section, A..

Claims (3)

A main earth leakage breaker to which the lead-in wire of the single-phase three-wire type electric circuit is connected, and a plurality of branch breakers connected to the secondary side electric circuit of the main earth leakage breaker are assembled, and after detecting an earthquake with a specific seismic intensity, A distribution board with a seismic isolation function, comprising a first seismic relay that shuts off the main earth leakage breaker at a predetermined timing,
When a seismic intensity equal to or higher than a predetermined level is detected, a plurality of second seismic relays for shutting off the branch breaker immediately or prior to the main earth leakage breaker are provided, and the second seismic relays generate pseudo earth leakage. While having an output part, at least one of the second seismic relays generates pseudo-leakage with a seismic intensity different from that of the other second seismic relays,
A distribution board with a seismic isolation function, wherein the branch breaker that performs an interruption operation in response to the seismic operation of the second seismic relay is a branch leakage breaker. A main earth leakage breaker to which the lead-in wire of a single-phase three-wire type electric circuit is connected, and a plurality of branch breakers connected to the secondary side electric circuit of the main earth leakage breaker are assembled, and after detecting an earthquake with a specific seismic intensity, A distribution board with a seismic interruption function, comprising a first seismic relay that operates to shut off the main earth leakage breaker at a predetermined timing,
When a seismic intensity equal to or higher than a predetermined seismic intensity is sensed, a second seismic relay for shutting off the branch breaker immediately or before the main earth leakage breaker is provided, and the second seismic relay generates a pseudo earth leakage output. A branch breaker that has a portion and that performs a blocking operation in response to the seismic motion of the second seismic relay is a branch earth leakage breaker,
Further, the branch leakage breaker is a three-terminal breaker, and the primary side terminal of the three-terminal breaker is connected to each phase of the single-phase three-wire type electric circuit, while the secondary side terminal has two terminals out of three terminals. A distribution board with seismic isolation function, which is used for connection of a branch electric circuit, and is configured by connecting the pseudo leakage output section to another terminal. The branch earth leakage breaker to which the pseudo earth leakage output section of the second seismic relay is connected is a three-terminal breaker, and the primary side terminal of the three-terminal breaker is connected to each phase of the single-phase three-wire circuit. On the other hand, as for the secondary side terminal, two terminals out of three terminals are used for connection of a branch electric circuit, and the other one terminal is connected to the pseudo earth leakage output section, and the seismic isolation is according to claim 1. Power distribution board with functions.

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