JP2017189077A - Distribution board with seismic isolation function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a distribution board with a seismic isolation function capable of instantly shutting off an existing branch leakage breaker while delaying and interrupting a main leakage breaker using a seismic relay when an earthquake occurs.SOLUTION: The distribution board with a seismic isolation function includes: a first seismic relay 4 for interrupting a main leakage breaker 1 at a predetermined timing after detecting an earthquake of a certain seismic intensity or more; and a plurality of second seismic relays 5 for instantly interrupting a branch breaker 3 when an earthquake of a predetermined seismic intensity or more is sensed. The second seismic relay 5 has a pseudo leakage output unit 42 for generating a pseudo leakage. The branch breaker 3 that performs the shutoff operation in response to the seismic operation of the second seismic relay 5 is a branch leakage breaker.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a distribution board with a seismic isolation function that includes a seismic relay and in which a breaker shuts off when an earthquake occurs.

Conventional distribution boards equipped with seismic seismic shut-off function are mainly those that shut off immediately when an earthquake is detected. However, if they are shut off immediately, devices that require power supplies such as lighting and telephones are instantly affected by the occurrence of an earthquake. There was a problem that the equipment used when residents evacuated could not be used. For this reason, a distribution board with a control unit (seismic relay) that is not shut off immediately when an earthquake occurs but is shut off at a predetermined timing after the occurrence of an earthquake, for example, when a power failure occurs has been proposed ( For example, see Patent Document 1).
On the other hand, a breaker having a seismic function has been proposed. For example, Patent Document 2 discloses a breaker that has a built-in timer and performs a shut-off operation after a certain period of time has elapsed since an earthquake was detected.

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

The distribution board configured to perform the shut-off operation not only immediately after the occurrence of the earthquake but at a predetermined timing thereafter can be configured not to shut off when evacuating, and smooth evacuation is possible. However, some electrical devices are desirable to immediately shut off the power supply when an earthquake occurs. Some of them may be cut off even in the case of a relatively small shaking, while others may not be cut off immediately in the case of a relatively small shaking.
For example, it is desirable to cut off the power supply of equipment that is not fixed like an electric heater or the like and that may move due to an earthquake even at a relatively small seismic intensity. On the other hand, it is difficult to imagine the occurrence of a fire or the like even if the electric heating device such as an electric stove is not cut off unless the seismic intensity is relatively large. Therefore, even when shutting off immediately, if the seismic intensity is taken into account, the convenience is further enhanced.
In order to satisfy such a requirement, it is possible to provide a seismic function to each branch breaker as disclosed in Patent Document 2, but the existing breaker can no longer be used, resulting in high costs. End up.

  Therefore, in view of such problems, the present invention uses a seismic relay to delay the main leakage breaker when an earthquake occurs, while the existing branch leakage breaker can be immediately cut off. The purpose is to provide a distribution board with functions.

In order to solve the above-mentioned problem, the invention of claim 1 includes a main leakage breaker to which a lead-in wire of a single-phase three-wire circuit is connected and a plurality of branch breakers connected to a secondary side electric circuit of the main leakage breaker. 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 when an earthquake of a specific seismic intensity or higher is detected. A second seismic relay is provided to shut off the branch breaker immediately or ahead of the main earth leakage breaker when an earthquake is detected. The second seismic relay has a pseudo-leakage output unit for generating a pseudo-leakage, and a second sense The branch breaker that operates in response to the seismic action of the seismic relay is a branch leakage breaker.
According to this configuration, when the first seismic relay detects an earthquake, the main earth leakage breaker performs a delay cut-off operation, and when the second seismic relay detects an earthquake, a specific branch breaker immediately or before the main earth breaker breaks. To do. Therefore, both fast interruption and delayed interruption can be realized, and the interruption operation having both convenience and safety can be performed. In addition, since the existing branch leakage breaker can be used as the branch breaker to be shut off quickly, it can be configured at low cost.

According to a second aspect of the present invention, in the configuration of the first aspect, a plurality of second seismic relays are provided, and at least one second seismic relay outputs pseudo-leakage with a seismic intensity different from other second seismic relays. It is characterized by doing.
According to this configuration, even if the electrical device is set to be shut off quickly, the seismic intensity can be set according to the type of the electrical device, so that convenience is further improved.

The invention according to claim 3 is the configuration according to claim 1 or 2, wherein the branch leakage breaker to which the pseudo leakage output portion of the second seismic relay is connected is a three-terminal breaker, and the primary side of the three-terminal breaker The terminal is connected to each phase of the single-phase three-wire circuit, while the secondary terminal is used to connect the branch circuit with two of the three terminals, and the pseudo-leakage output is connected to the other one terminal It is characterized by comprising.
According to this configuration, since the second seismic relay is connected to the terminal of the branch leakage breaker, it is not necessary to connect to the branch circuit and it is not necessary to provide a separate terminal block.

  According to the present invention, when the first seismic relay detects an earthquake, the main earth leakage breaker performs a delay cut-off operation, and when the second seismic relay detects an earthquake, a specific branch breaker immediately or before the main earth breaker breaks. To do. Therefore, both fast interruption and delayed interruption can be realized, and the interruption operation having both convenience and safety can be performed. In addition, since the existing branch leakage breaker can be used as the branch breaker to be shut off quickly, it can be configured at low cost.

It is composition explanatory drawing which shows an example of the distribution board with a seismic-sensing interruption | blocking function which concerns on this invention. It is a circuit block diagram of a seismic relay.

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

The primary side of the main ELB1 is connected to a lead-in wire (primary side electric circuit A1) of the electric circuit A, and the secondary side electric circuit A (secondary side electric circuit A2) is connected to a plurality of branch electric circuits B1 via branch breakers 2 and 3. , B2 (B2a, B2b... B2n) are formed.
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 terminals are connected to each of the three secondary electric circuits A2, and two of the three secondary terminals are connected to the branch electric circuit B2. 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 according to 200V output or 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 detects an earthquake and outputs a signal corresponding to the vibration, a pseudo-leakage output unit 42 that outputs a pseudo-leakage, a time setting unit 43 that sets a timing (delay time) for outputting a pseudo-leakage, and a pseudo-leakage A seismic intensity setting unit 44 that sets the seismic intensity to be generated, a seismic relay CPU 45 that receives the shaking information from the seismic sensor 41, determines the seismic intensity, and controls the pseudo-leakage output unit 42 are provided.
The time setting unit 43 can be set, for example, immediately in three steps of 1 minute, 3 minutes, and the seismic intensity setting unit 44 can be set in three steps of, for example, 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 relay 4 is connected to the primary side electric circuit A1 by a connection line S1. And the connection line S2 which is an input line for generating a pseudo electric 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 main ELB1. .
With this connection, if an earthquake with a seismic intensity higher than the set level occurs, a current (pseudo-leakage current) flows through the connection lines S2 and S1 so as to bypass the main ELB1, and the circuit A operates as if a leakage occurred. The main ELB1 is 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. And the connection line S4 which is an input line for generating a pseudo electric 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. .
If an earthquake with a seismic intensity greater than the set seismic intensity occurs due to this connection, a current (pseudo-leakage current) flows through the connection lines S4 and S3 so as to bypass the branch ELB3, and it operates as if a leakage occurred in the branch circuit B2. The branch ELB3 is 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 therein. The power supply line is also used as the connection lines S2 and S4.

The operation of the distribution board with seismic isolation function configured as described above is as follows. When the seismic relays 4 and 5 are set as described above, the first seismic relay 4 is set to operate in a delayed manner, and the second seismic relay 5 is set to operate immediately. For example, the first seismic relay 4 is used with a set time (delay time) of 3 minutes and a seismic intensity setting of, for example, a seismic intensity of 5 strong, and the second seismic relay 5 is set immediately with a set time of about 5 seismic intensity. Used for seismic intensity setting including front and rear.
And the 2nd seismic relay 5 is installed according to the number of branch electric circuits which need to be interrupted immediately, and branch ELB3 is used for the branch breaker in the branch electric circuit B2.

  Specifically, for example, when an electric device that generates heat such as an unfixed electric stove is connected to the end of the branch electric circuit B2a branched by the first branch ELB 3a shown in FIG. For example, the seismic relay 5a has a seismic intensity of less than 5 and is smaller than the seismic intensity of the main ELB1, and an electric heating device such as an electric stove is connected to the end of the branch circuit B2b branched by the second branch ELB3b. In the case where the seismic intensity is set, the seismic intensity of the second seismic relay 5b to be connected is set to, for example, a little less than 6, and the seismic intensity greater than that of the main ELB1 can be obtained.

With such a setting, the branch circuit B2a to which the electrical device that should be cut off even if a relatively small shake is generated immediately after the occurrence of the earthquake can block the branch ELB 3a with a smaller seismic intensity than the main ELB1. Yes, it is safe and preferable.
On the other hand, even if there is an electrical device that should be shut off immediately when an earthquake occurs, in the case of the branch circuit B2b to which the electric heating device that is fixed and stable is connected, the main trunk unless a relatively large shaking occurs. ELB1 delay cut-off may be used, and frequent cut-off operations can be avoided.

As described above, when the first seismic relay 4 detects an earthquake, the main ELB1 performs a delay cut-off operation at a predetermined timing, and when the second seismic relay 5 detects an earthquake, the specific branch breaker 3 is cut off immediately. Therefore, both immediate interruption and delayed interruption can be realized, and the interruption operation having both convenience and safety can be performed. Moreover, since the existing branch ELB can be used for the branch breaker 3 to be immediately shut off, and the seismic relays 4 and 5 having one pseudo-leakage output unit 42 can be made at low cost, it can be configured at low cost.
Furthermore, even if an electrical device is set to be shut off immediately, it can be shut off at a seismic intensity that matches the type of electrical 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 provide a separate terminal block.

In the above embodiment, a three-terminal leakage breaker is used as the branch breaker 3. However, a two-terminal leakage breaker may be used. Connected to seismic relay 5.
The second seismic relay 5 immediately generates a pseudo-leakage when an earthquake is detected. However, depending on the connection load, the branch ELB3 may be cut off before the main ELB1. In such a case, it may be delayed by, for example, 1 minute.
Furthermore, although both the first seismic relay 4 and the second seismic relay 5 have the same configuration, the second seismic relay 5 for operating the branch ELB 3 may be fixed without the time setting unit 43.
In addition, the branch breaker to which the first seismic relay 4 or the second seismic relay 5 is not connected is the separation breaker 2 that does not have the function of interrupting the earth leakage, but of course the branch ELB 3 may be used.

  1 .... Main earth leakage breaker, 2 .... Branch breaker, 3 .... Branch earth leakage breaker (branch breaker), 4 .... First seismic relay, 5 .... Second seismic relay, 41 ... Seismic sensor, 42・ ・ Pseudo-leakage output part, A ・ ・ Single-phase three-wire circuit.

Claims (3)

When a main earth leakage breaker to which a lead wire of a single-phase three-wire circuit is connected and a plurality of branch breakers connected to the secondary electric circuit of the main earth leakage breaker are assembled, A distribution board with a seismic isolation function including a first seismic relay that shuts off the main earth leakage breaker at a predetermined timing,
When an earthquake having a predetermined seismic intensity or more is detected, the branch breaker is provided immediately or before the main earth leakage breaker, and includes a second seismic relay. The second seismic relay generates a pseudo earth leakage output that generates a pseudo earth leakage. A distribution board with a seismic isolation function is characterized in that the branch breaker that has a section and that performs a cutoff operation in response to the seismic operation of the second seismic relay is a branch leakage breaker.   2. The seismic isolation circuit according to claim 1, wherein the second seismic relay includes a plurality of second seismic relays, and at least one of the second seismic relays generates a pseudo-leakage with a seismic intensity different from that of other second seismic relays. Function distribution board.   The branch leakage breaker to which the pseudo-leakage output unit of the second seismic relay is connected is a three-terminal breaker, and the primary terminal of the three-terminal breaker is connected to each phase of the single-phase three-wire circuit. 3. The sense according to claim 1, wherein two of the three terminals are used for connecting a branch circuit, and the pseudo-leakage output unit is connected to the other terminal. Distribution board with seismic cutoff function.

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