JP2017163812A - Abnormality determination method, abnormality determination system, program, interruption system, and distribution board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an abnormality determination method, abnormality determination system, program, interruption system, and distribution board for determining the existence of abnormality such as an electric accident following an earthquake.SOLUTION: A detection step is a step of detecting occurrence of an earthquake. A measurement step is a step of measuring electric leakage current in a user facility. A determination step is a step of determining whether or not an electricity use state in the user facility is normal on the basis of a measurement result of the measurement step. In the determination step, whether or not the electricity use state in the user facility is normal is determined from a result of comparing first electric leakage current with second electric leakage current. The first electric leakage current is electric leakage current measured in the measurement step before the earthquake is detected in the detection step. The second electric leakage current is electric leakage current measured in the measurement step after the earthquake is detected in the detection step.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an abnormality determination method, an abnormality determination system, a program, a shut-off system, and a distribution board, and more specifically, an abnormality determination method and an abnormality determination system for determining the presence or absence of an abnormality such as an electrical accident associated with an earthquake. , Program, shut-off system, and distribution board.

  Conventionally, a management system that can appropriately control the supply of energy to a consumer when an earthquake or the like occurs has been provided (see, for example, Patent Document 1). The management system described in Patent Literature 1 includes a communication device and an external device. The communication device includes a detection unit and a control unit. The external device has a switching unit.

  A detection part detects the magnitude | size of a shake based on the acceleration added to the communication apparatus. The control unit transmits a control signal corresponding to the detection result of the detection unit to the external device. The switching unit is provided in the energy supply path from the supplier to the consumer, and is switched between a supply state in which energy is supplied and a cutoff state in which the supply of energy is cut off in accordance with the control signal.

  In the management system described in Patent Literature 1, when the magnitude of the shaking detected by the detection unit is equal to or greater than a predetermined seismic intensity, the control unit transmits a control signal for switching the switching unit to the cutoff state to the external device. And a switching part is switched from a supply state to the interruption | blocking state by the said control signal, and the supply of energy to a consumer is interrupted | blocked.

JP-A-2015-198517

  In the management system described in Patent Document 1 described above, even if an abnormality such as an electrical accident associated with an earthquake occurs in a customer, the abnormality cannot be detected.

  The present invention has been made in view of the above problems, and an object thereof is to provide an abnormality determination method, an abnormality determination system, a program, a shut-off system, and a distribution board that can determine the presence or absence of an abnormality such as an electrical accident associated with an earthquake. To do.

  The abnormality determination method according to one aspect of the present invention includes a detection step, a measurement step, and a determination step. The detection step is a step of detecting the occurrence of an earthquake. The measurement step is a step of measuring a leakage current in a customer facility. The determination step is a step of determining whether or not the usage state of electricity in the customer facility is normal based on the measurement result of the measurement step. In the determining step, it is determined whether or not the usage state of the electricity is normal from a comparison result between the first leakage current and the second leakage current. The first leakage current is the leakage current measured in the measurement step before an earthquake is detected in the detection step. The second leakage current is the leakage current measured in the measurement step after an earthquake is detected in the detection step.

  An abnormality determination system according to an aspect of the present invention includes a detection unit, a measurement unit, and a determination unit. The detection unit detects the occurrence of an earthquake. The measurement unit measures a leakage current in a customer facility. The determination unit determines whether or not the usage state of electricity in the customer facility is normal based on a measurement result of the measurement unit. The determination unit determines whether or not the usage state of the electricity is normal from a comparison result between the first leakage current and the second leakage current. The first leakage current is the leakage current measured by the measurement unit before an earthquake is detected by the detection unit. The second leakage current is the leakage current measured by the measurement unit after an earthquake is detected by the detection unit.

  A program according to one embodiment of the present invention causes a computer to function as a determination unit. The determination unit determines whether or not the usage state of electricity in the customer facility is normal from a comparison result between the first leakage current and the second leakage current. The first leakage current is the leakage current measured by the measurement unit that measures the leakage current in the customer facility before the earthquake is detected by the detection unit that detects the occurrence of the earthquake. The second leakage current is the leakage current measured by the measurement unit after an earthquake is detected by the detection unit.

  The interruption | blocking system which concerns on 1 aspect of this invention is equipped with the electricity distribution panel and the above-mentioned abnormality determination system. The distribution board distributes power from the power line to a plurality of branch circuits via a main breaker electrically connected to the power line. When determining that the electricity usage state is abnormal, the determination unit blocks the main breaker or a branch breaker included in a target branch circuit among the plurality of branch circuits.

  The distribution board which concerns on 1 aspect of this invention is used for the above-mentioned interruption | blocking system.

  The present invention has an advantage that it is possible to determine the presence or absence of an abnormality such as an electrical accident associated with an earthquake.

FIG. 1 is a block diagram showing a configuration of a distribution board according to an embodiment of the present invention. 2A and 2B are waveform diagrams of currents measured in the abnormality determination system according to one embodiment of the present invention. FIG. 3 is a flowchart for explaining the operation of the shutoff system according to the embodiment of the present invention.

  As shown in FIG. 1, the abnormality determination system according to the present embodiment includes a detection unit 21, a measurement unit 11, and a determination unit 14. The detector 21 detects the occurrence of an earthquake. The measuring unit 11 measures the leakage current I4 in the customer facility. The determination unit 14 determines whether or not the usage state of electricity in the customer facility is normal based on the measurement result of the measurement unit 11. The determination unit 14 determines whether or not the usage state of electricity is normal from the comparison result between the first leakage current and the second leakage current. The first leakage current is the leakage current I4 measured by the measurement unit 11 before the detection unit 21 detects the earthquake. The second leakage current is a leakage current I4 measured by the measurement unit 11 after the detection unit 21 detects an earthquake.

  The interruption | blocking system of this embodiment is provided with the electricity distribution panel 10 and the above-mentioned abnormality determination system, as shown in FIG. The distribution board 10 distributes the power from the power line 5 to the plurality of branch circuits 4A to 4F via the main breaker 3 electrically connected to the power line 5. When the determination unit 14 determines that the usage state of electricity is abnormal, the determination unit 14 blocks the branch breaker included in the target branch circuit 4 among the main breaker 3 or the plurality of branch circuits 4A to 4F.

  The distribution board 10 of this embodiment is used for the above-mentioned interruption | blocking system.

  Hereinafter, the abnormality determination system, the shut-off system, and the distribution board 10 of the present embodiment will be specifically described with reference to the drawings. However, the configuration described below is merely an example of the present invention, and the present invention is not limited to the following embodiment. Therefore, various modifications other than this embodiment can be made according to the design and the like as long as they do not depart from the technical idea of the present invention.

  The abnormality determination system of this embodiment is a system for determining whether there is an abnormality such as an electrical accident associated with an earthquake in the customer facility 100. This abnormality determination system is used together with, for example, the distribution board 10 and shuts off a target branch circuit 4 among a later-described main breaker 3 or a plurality of branch circuits 4A to 4F when an electrical accident due to an earthquake occurs. Configure the shut-off system. The “customer facility 100” here means a facility of a power consumer, and not only a facility that receives power supply from an electric power company (electric power supplier) such as an electric power company, but also a solar power generation facility. This includes facilities that receive power supply from private power generation facilities such as In the present embodiment, a detached house will be described as an example of the customer facility 100.

  First, the distribution board 10 will be described. If the distribution board 10 is, for example, a single-phase three-wire distribution system, as shown in FIG. 1, the first voltage line (L1 phase) 51, the second voltage line (L2 phase) 52, and the neutral line (N Phase) 53 and electrically connected to the power line 5. The distribution board 10 distributes AC power from the power line 5 to a plurality of (six in this embodiment) branch circuits 4A to 4F. In the following, each of the plurality of branch circuits 4A to 4F is also referred to as a “branch circuit 4” unless the plurality of branch circuits 4A to 4F are particularly distinguished. The “branch circuit” here includes a branch breaker, a wiring path connected to the secondary side of the branch breaker, a wiring device (outlet, wall switch, etc.), and various devices (lighting device, cooking appliance, etc.). It is out.

  As shown in FIG. 1, the distribution board 10 of the present embodiment includes a measurement unit 1, a seismic unit 2, a main breaker 3, a plurality (six in this embodiment) of branch circuits 4 </ b> A to 4 </ b> F, A plurality (eight in this embodiment) of current sensors 6A, 6B, 7A to 7F are provided.

  The primary side terminal of the main breaker 3 is electrically connected to the system power supply via the power line 5 of the three-wire system (first voltage line 51, second voltage line 52, and neutral line 53). Connected to the secondary side terminal of the main breaker 3 are three-pole conductive bars of L1, L2, and N phases. These three-pole conductive bars are electrically connected to the first voltage line (L1 phase) 51, the second voltage line (L2 phase) 52, and the neutral line (N phase) 53 on a one-to-one basis.

  In addition, the main breaker 3 includes a contact portion 31, a cutoff portion 32, and a leakage detector 33. The contact portion 31 has three contacts inserted respectively in the first voltage line 51, the second voltage line 52, and the neutral wire 53, and is configured such that the three contacts are opened by an open signal from the blocking portion 32. Has been. Further, the contact portion 31 is configured such that the contact is opened and closed by operating a handle provided on the front side of the casing of the main breaker 3. The blocking unit 32 generates an open signal that opens the contact unit 31 in accordance with a blocking signal S1 (see FIG. 2A) output from the blocking determination unit 22 (described later) of the seismic unit 2, and uses the generated open signal as a contact point. To the unit 31. The leakage detector 33 includes, for example, a zero-phase current transformer (ZCT), and detects a leakage current I4 flowing through the power line 5. And the leak detection part 33 will output a detection result to the interruption | blocking part 32 and the measurement part 11 (after-mentioned) of the measurement unit 1, if the leakage current I4 which flows into the power line 5 is detected. Therefore, even if the interruption | blocking part 32 does not receive interruption | blocking signal S1 from the interruption | blocking determination part 22 of the seismic unit 2, the magnitude | size of the earth leakage current I4 detected by the earth leakage detection part 33 is predetermined value (for example, 30 mA). If it becomes above, an open signal will be output to the contact part 31. FIG.

  Each of the plurality of branch circuits 4 has a branch breaker. The branch breaker is electrically connected to the secondary terminal of the main breaker 3 by being connected to the conductive bar.

  The measurement unit 1 includes a measurement unit 11, a calculation unit 12, a storage unit 13, a determination unit 14, and a notification unit 15.

  A pair of (main trunk) current sensors 6A and 6B and a plurality of (branch) current sensors 7A to 7F are electrically connected to the measurement unit 11. In addition, the measurement unit 11 is electrically connected to a leakage detection unit 33 built in the main breaker 3. The pair of current sensors 6 </ b> A and 6 </ b> B is provided in a one-to-one correspondence with the first voltage line 51 and the second voltage line 52. The plurality of current sensors 7A to 7F are provided in one-to-one correspondence with the plurality of branch circuits 4A to 4F. Thereby, in the measurement part 11, the 1st main current I1 which flows through the 1st voltage line 51 can be measured from the output of the current sensor 6A, and the 2nd main trunk which flows through the 2nd voltage line 52 from the output of the current sensor 6B. The current I2 can be measured. Further, the measuring unit 11 can measure branch currents I31 to I36 flowing through the plurality of branch circuits 4A to 4F from the outputs of the plurality of current sensors 7A to 7F, respectively. Furthermore, the measurement unit 11 can measure the leakage current I4 from the output of the leakage detection unit 33. In the present embodiment, the measurement unit 11 periodically measures the first main current I1, the second main current I2, the branch currents I31 to I36, and the leakage current I4 described above.

  Here, as the current sensors 6A, 6B, 7A to 7F, for example, a CT (Current Transformer) sensor, a Hall element, a magnetoresistive element such as a GMR (Giant Magnetic Resistances) element, a shunt resistance, or the like is used. In the present embodiment, as an example, each of the current sensors 6A and 6B includes a CT sensor. On the other hand, each of the plurality of current sensors 7 </ b> A to 7 </ b> F is a Rogowski coil that includes an air-core coil that does not use a core (coreless) and generates an output corresponding to a current passing through the through hole.

  The calculation unit 12 is electrically connected to the measurement unit 11 and uses at least one of the power consumption and the power consumption amount as a measurement value for each of the plurality of branch circuits 4 using the measurement result of the measurement unit 11. measure. The measured value may be power consumption representing instantaneous power, or may be power consumption representing power consumption (usage) for a certain period of time. Further, the measured value may be both power consumption and power consumption. In the present embodiment, as an example, the measured value is a power consumption amount obtained by integrating power consumption for a certain time (for example, 1 minute).

  The computing unit 12 monitors the line voltage of the power line (first voltage line 51, second voltage line 52, and neutral line 53) 5. The computing unit 12 has, for example, a microcomputer as a main component, and obtains a measured value by computing using the line voltage and the branch currents I31 to I36. In addition, the calculating part 12 may be the structure which calculates | requires not only the measured value about each of the some branch circuit 4 but the total power consumption of the consumer facility 100 as a measured value.

  The storage unit 13 stores a circuit name associated with each of the plurality of branch circuits 4. In the present embodiment, the storage unit 13 stores “electric stove” as the circuit name of the branch circuit 4A and stores “TV” as the circuit name of the branch circuit 4B. The storage unit 13 stores “lighting” as the circuit name of the branch circuit 4C and stores “air conditioner” as the circuit name of the branch circuit 4E. Further, the storage unit 13 also stores each voltage division (information indicating whether the applied voltage is 100 [V] or 200 [V]) of the plurality of branch circuits 4. In the present embodiment, the storage unit 13 stores the branch circuits 4A to 4D and the voltage division of 100 [V] in association with each other, and stores the branch circuits 4E and 4F and the voltage division of 200 [V] in association with each other. doing. The storage unit 13 also stores the first main current I1, the second main current I2, the branch currents I31 to I36, and the leakage current I4 that are periodically measured by the measurement unit 11. In the following description, it is assumed that no load is connected to the branch circuits 4D and 4F.

  The storage unit 13 is electrically connected to the calculation unit 12. The calculation unit 12 can obtain the measurement value with high accuracy by correcting the calculation result in accordance with the voltage classification stored in the storage unit 13. Here, in the present embodiment, the leakage current I4 measured by the measurement unit 11 before the earthquake is detected by the detection unit 21 (described later) of the seismic sensing unit 2 is the first leakage current. In the present embodiment, the leakage current I4 measured by the measurement unit 11 after the detection unit 21 detects an earthquake is the second leakage current.

  The determination unit 14 is electrically connected to the storage unit 13, and the use state of electricity in the customer facility 100 is normal based on a comparison result between the first leakage current and the second leakage current stored in the storage unit 13. It is determined whether or not. Specifically, the determination unit 14 obtains a difference between the first leakage current and the second leakage current, and determines that the usage state of electricity is abnormal when the difference is a specified value (for example, 15 mA) or more. That is, the determination unit 14 is configured such that the difference between the second leakage current measured after the detection unit 21 detects the earthquake and the first leakage current measured before the detection unit 21 detects the earthquake is a specified value. In the above case, the usage state of electricity is determined to be abnormal.

  The determination unit 14 has, for example, a microcomputer as a main component, and implements various functions by executing a program recorded in the memory of the microcomputer by a processor such as a CPU (Central Processing Unit). The program may be recorded in advance in a memory of a microcomputer, may be provided by being recorded on a recording medium such as a memory card, or may be provided through an electric communication line. The determination process of the determination unit 14 will be described later.

  The notification unit 15 includes, for example, a speaker and a buzzer, and notifies the determination result of the determination unit 14 by voice or sounds the buzzer. Thereby, the determination result of the determination part 14 can be notified to a user.

  As shown in FIG. 1, the seismic unit 2 includes a detection unit 21 and a blocking determination unit 22.

  The detection unit 21 is configured by using an acceleration sensor, and detects the magnitude (seismic intensity) of the shake based on the acceleration applied to the seismic unit 2. In other words, the detection unit 21 is configured to measure the magnitude of shaking when an earthquake occurs, and detects the occurrence of an earthquake by monitoring the magnitude of shaking of the seismic unit 2. The detection unit 21 is configured to represent the magnitude of the detected shaking in, for example, 10 levels from “level 1” to “level 10”, and output the detection result to the interruption determination unit 22.

  The blocking determination unit 22 compares the magnitude of the shaking (seismic intensity) detected by the detecting unit 21 with a predetermined seismic intensity (for example, seismic intensity 5). And the interruption | blocking determination part 22 will output the interruption | blocking signal S1 to the interruption | blocking part 32, if the magnitude | size of the shake detected by the detection part 21 is more than predetermined seismic intensity. The interruption part 32 opens the contact part 31 in accordance with this interruption signal S1, and interrupts the main breaker 3. The predetermined seismic intensity is selected from the above-described ten levels of “level 1” to “level 10”, and is set, for example, before the distribution board 10 is shipped.

  Further, as shown in FIG. 1, the interruption determination unit 22 is electrically connected to the determination unit 14 described above, and can also block the main breaker 3 according to the determination result of the determination unit 14. For example, when detecting the occurrence of an earthquake from the detection result of the detection unit 21, the interruption determination unit 22 outputs a detection signal indicating that the occurrence of the earthquake has been detected to the determination unit 14. The determination unit 14 performs determination processing according to the detection signal. Then, when the determination unit 14 determines that the electricity usage state in the customer facility 100 is abnormal from the determination result, the determination unit 14 outputs an abnormal signal indicating that the electricity usage state is abnormal to the interruption determination unit 22. The shut-off determination unit 22 generates a shut-off signal S1 (see FIG. 2A) for shutting off the main breaker 3 according to the abnormal signal, and outputs the generated shut-off signal S1 to the shut-off unit 32 of the main breaker 3. The interruption part 32 opens the contact part 31 in accordance with this interruption signal S1, and interrupts the main breaker 3. As a result, power supply from the system power source to the customer facility 100 is cut off.

  Here, in this embodiment, the abnormality determination system is configured by the measurement unit 11, the determination unit 14, the notification unit 15, and the detection unit 21. Note that the notification unit 15 may be omitted. In the present embodiment, the distribution board 10 and the abnormality determination system constitute a shut-off system.

  Next, the determination process of the determination unit 14 will be described with reference to FIGS. 2A and 2B. FIG. 2A is a waveform diagram of the first main current I1, the branch currents I31 to I35, and the leakage current I4 when no electrical accident has occurred due to the earthquake. FIG. 2B is a waveform diagram of the first main current I1, the branch currents I31 to I35, and the leakage current I4 when an electrical accident associated with an earthquake occurs.

  First, the determination process of the determination part 14 when the electric accident accompanying an earthquake has not occurred is demonstrated with reference to FIG. 2A.

  Before the time t1 when an earthquake is detected by the detection unit 21 of the seismic sensing unit 2, the interruption signal S1 output from the interruption determination unit 22 is at a low level, so that the contact point 31 is in a closed state, and the main breaker 3 Is not shut off.

  When the detection unit 21 detects an earthquake at time t <b> 1, the interruption determination unit 22 determines whether or not the main breaker 3 should be interrupted from the detection result of the detection unit 21. And the interruption | blocking determination part 22 determines that the main breaker 3 should be interrupted | blocked when the magnitude | size of the shake detected by the detection part 21 is more than a predetermined seismic intensity, and predetermined time (for example, 3 minutes) passed. At time t2, a high level cutoff signal S1 is output to the cutoff unit 32 of the main breaker 3. The interruption part 32 opens the contact part 31 by the interruption signal S <b> 1 from the interruption determination part 22, and interrupts the main breaker 3.

  When the resident re-injects the main breaker 3 at time t3, the power supply from the system power supply to the customer facility 100 is resumed by closing the contact portion 31. Here, the determination unit 14 of the measurement unit 1 determines the effective value of the first main current I1 before the detection unit 21 detects the earthquake and the effective value of the first main current I1 after the detection unit 21 detects the earthquake. It is determined from the comparison result with the value whether or not the usage state of electricity in the customer facility 100 is normal. In the example illustrated in FIG. 2A, the determination unit 14 determines the effective value of the first main current I1 in the first period TE1 before the occurrence of the earthquake and the effective value of the first main current I1 in the second period TE2 after the occurrence of the earthquake. Compare the value.

  Here, in the first period TE1, the “electric stove” connected to the branch circuit 4A is on, and a branch current I31 of a predetermined magnitude flows in the branch circuit 4A. The “TV” connected to the branch circuit 4B and the “illumination” connected to the branch circuit 4C are both off, but so-called standby currents (branch currents I32 and I33) flow through the branch circuits 4B and 4C. ing. Further, the “air conditioner” connected to the branch circuit 4E is on, and a branch current I35 having a predetermined magnitude flows through the branch circuit 4E. The first main current I1 flowing through the first voltage line 51 connected to the main circuit breaker 3 is the total current of these branch currents I31 to I33, I35. In the example shown in FIG. 2A, since no load is connected to the branch circuit 4D, the branch current I34 of the branch circuit 4D is zero.

  In the second period TE2, branch currents I31 to I33 having the same magnitude as that before the occurrence of the earthquake flow in the branch circuits 4A to 4C, respectively. On the other hand, the “air conditioner” connected to the branch circuit 4E is reset when the main breaker 3 is shut off once, and is switched from the on state to the off state. Therefore, only the so-called standby current (branch current I35) flows through the branch circuit 4E. As a result, the first main current I1 measured in the second period TE2 is smaller than the first main current I1 measured in the first period TE1 (see FIG. 2A). In other words, the effective value of the first main current I1 in the second period TE2 is smaller than the effective value of the first main current I1 in the first period TE1.

  And since the effective value of the 1st main current I1 in the 2nd period TE2 is smaller than the effective value of the 1st main current I1 in the 1st period TE1, the determination part 14 has not produced the electrical accident accompanying an earthquake. Is determined. That is, the determination unit 14 determines that the electricity usage state in the customer facility 100 is normal.

  Next, the determination process of the determination unit 14 when an electrical accident associated with an earthquake occurs will be described with reference to FIG. 2B.

  Before the time t1 when an earthquake is detected by the detection unit 21 of the seismic sensing unit 2, the interruption signal S1 output from the interruption determination unit 22 is at a low level, so that the contact point 31 is in a closed state, and the main breaker 3 Is not shut off.

  When the detection unit 21 detects an earthquake at time t <b> 1, the interruption determination unit 22 determines whether or not the main breaker 3 should be interrupted from the detection result of the detection unit 21. And the interruption | blocking determination part 22 determines that the main breaker 3 should be interrupted | blocked when the magnitude | size of the shake detected by the detection part 21 is more than a predetermined seismic intensity, and predetermined time (for example, 3 minutes) passed. At time t2, a high level cutoff signal S1 is output to the cutoff unit 32 of the main breaker 3. The interruption part 32 opens the contact part 31 by the interruption signal S <b> 1 from the interruption determination part 22, and interrupts the main breaker 3.

  When the resident re-injects the main breaker 3 at time t3, the power supply from the system power supply to the customer facility 100 is resumed by closing the contact portion 31. Here, the determination unit 14 of the measurement unit 1 determines the effective value of the first main current I1 before the detection unit 21 detects the earthquake and the effective value of the first main current I1 after the detection unit 21 detects the earthquake. It is determined from the comparison result with the value whether or not the usage state of electricity in the customer facility 100 is normal. In the example illustrated in FIG. 2B, the determination unit 14 determines the effective value of the first main current I1 in the first period TE1 in the first period TE1 before the occurrence of the earthquake and the effective value of the first main current I1 in the second period TE2 after the occurrence of the earthquake. Compare the value.

  Here, in the first period TE1, the “electric stove” connected to the branch circuit 4A is off, and the branch current I31 of the branch circuit 4A is zero. The “TV” connected to the branch circuit 4B and the “illumination” connected to the branch circuit 4C are both off, but standby currents (branch currents I32 and I33) flow through the branch circuits 4B and 4C. Yes. Further, the “air conditioner” connected to the branch circuit 4E is on, and a branch current I35 having a predetermined magnitude flows through the branch circuit 4E. The first main current I1 flowing through the first voltage line 51 connected to the main circuit breaker 3 is the total current of these branch currents I31 to I33, I35.

  In the second period TE2, the branch current I31 flowing through the branch circuit 4A changes from zero to a predetermined magnitude. This is assumed to be the case where the power switch of the “electric stove” is turned from off to on with an object that has fallen due to an earthquake. Therefore, in this case, if there is a flammable object such as a curtain around the “electric heater”, a fire may occur. Further, branch currents (standby currents) I32 and I33 having the same magnitude as that before the occurrence of the earthquake flow through the branch circuits 4B and 4C. Further, a standby current (branch current I35) flows through the branch circuit 4E to which the “air conditioner” is connected, as in FIG. 2A. Further, for example, when a half-break or short circuit has occurred in the electric wire connected to the branch circuit 4F, an arc current (second in FIG. 2B) that repeats ON and OFF randomly when the main breaker 3 is turned on again. The branch current I34) in the period TE2 flows to the branch circuit 4F. From the above, the first main current I1 measured in the second period TE2 is larger than the first main current I1 measured in the first period TE1 (see FIG. 2B). In other words, the effective value of the first main current I1 in the second period TE2 is larger than the effective value of the first main current I1 in the first period TE1.

  And since the effective value of the 1st main current I1 in the 2nd period TE2 is larger than the effective value of the 1st main current I1 in the 1st period TE1, the determination part 14 has generate | occur | produced the electrical accident accompanying an earthquake. Is determined. That is, the determination unit 14 determines that the usage state of electricity in the customer facility 100 is abnormal. Here, “the state of use of electricity is normal” means that, as described above, an arc current due to a half-break or short circuit flows, a zero load current changes to a predetermined value, or a leakage current I4 (described later). ) Is not flowing. That is, when the arc current or the leakage current I4 flows or the load current that has been zero has changed to a predetermined value, the usage state of electricity is abnormal.

  In the example shown in FIG. 2B, for example, when no arc current (branch current I34) flows through the branch circuit 4F, the first main current I1 in the second period TE2 is the first main current in the first period TE1. There is a possibility that it is almost the same as I1 or smaller. In this case, the determination unit 14 determines that the usage state of electricity in the customer facility is normal, and thus determines that it is normal, and therefore a fire occurs due to the “electric stove” connected to the branch circuit 4A. there is a possibility. That is, there is a possibility of erroneous determination only by the comparison process using the first main current I1 flowing through the main circuit breaker 3.

  Therefore, when determining whether or not the usage state of electricity in the customer facility 100 is normal, not only the determination process is performed based on the first main current I1 in the main breaker 3, but also the determination process is performed for each branch circuit 4. Preferably it is done. For example, in the example illustrated in FIG. 2B, in the branch circuit 4A, the branch current I31 in the second period TE2 is equal to or greater than the branch current I31 in the first period TE1, so the determination unit 14 Can be determined as abnormal. Moreover, since the branching current I34 in the second period TE2 is greater than or equal to the branching current I34 in the first period TE1, the determination unit 14 determines that the electricity usage state in the customer facility 100 is abnormal for the branch circuit 4F. Can do. As described above, by performing the determination process for each branch circuit 4, it is possible to improve the accuracy of the determination process, thereby reducing an abnormality such as an electrical accident associated with an earthquake.

  Here, when the determination process is performed for each branch circuit 4, it is preferable to determine the order of the branch circuits 4 that perform the determination process according to the distortion rate of the waveform of the branch current measured in the first period TE1. In other words, among the plurality of branch circuits 4, the remaining parts other than the specific branch circuit 4 are excluded from the specific branch circuit 4 to which a load having a distortion rate of the branch current waveform equal to or less than a reference value (for example, 5%) is connected. It is preferable to determine whether or not the usage state of electricity is normal before the branch circuit 4. The waveform of the branch current is measured in the first period TE1. For example, since an “electric stove” connected to a branch circuit 4A, which is a specific branch circuit, is generally a resistive load, the branch current I31 flowing through the branch circuit 4A has a waveform close to a sine wave, and the distortion rate is 5 % Or less. In other words, since the “electric stove” connected to the branch circuit 4A is a resistive load, a branch current I31 having a power factor close to 1 and several A or more flows through the branch circuit 4A. Therefore, the distortion rate of the waveform of the current measured in the first period TE1 is equal to or less than the reference value, in other words, the determination process is performed preferentially for the branch circuit 4 to which the load having a power factor close to 1 is connected. Can be performed efficiently.

  Further, when the leakage current I4 is detected even when the first main current I1 in the second period TE2 is substantially the same as or smaller than the first main current I1 in the first period TE1, the electricity in the customer facility 100 It is preferable to determine that the use state is abnormal. In other words, when the difference between the leakage current (second leakage current) I4 in the second period TE2 and the leakage current (first leakage current) I4 in the first period TE1 is a specified value (for example, 15 mA) or more, the customer facility It is preferable to determine that the usage state of electricity at 100 is abnormal. For example, in the example shown in FIG. 2B, the leakage current I4 is zero in the first period TE1, whereas the leakage current I4 having a predetermined magnitude is measured in the second period TE2. At this time, when the difference between the leakage current I4 in the second period TE2 and the leakage current I4 in the first period TE1 is greater than or equal to a specified value, the determination unit 14 determines that the electricity usage state in the customer facility 100 is abnormal. be able to.

  Next, operation | movement of the interruption | blocking system of this embodiment is demonstrated with reference to the flowchart shown in FIG. Since the comparison process (determination process) in step ST5 has already been described, detailed description thereof is omitted here.

  The interruption determination unit 22 of the seismic unit 2 determines whether an earthquake has occurred based on the detection result of the detection unit 21 (step ST1). When no earthquake is detected by the detection unit 21 (No in step ST1), no detection signal is input from the interruption determination unit 22 to the determination unit 14 of the measurement unit 1. In this case, the main breaker 3 remains on.

  On the other hand, when the detection unit 21 detects an earthquake (Yes in step ST1), the blocking determination unit 22 determines the seismic intensity of the earthquake from the detection result of the detection unit 21 (step ST2). When the seismic intensity of the earthquake is greater than or equal to the predetermined seismic intensity in step ST2, the shutoff determination unit 22 outputs a shutoff signal S1 to the shutoff unit 32 of the main breaker 3, and the main breaker 3 is shut off by this shutoff signal S1 (step ST3). . When the main breaker 3 is shut off, the determination unit 14 of the measurement unit 1 determines whether or not the resident has reintroduced the main circuit breaker 3 (step ST4), and in step ST4 until the main circuit breaker 3 is reintroduced. Repeat the process.

  When the main breaker 3 is turned on again (Yes in step ST4), the determination unit 14 detects the earth leakage current I4 (first earth leakage current) before the detecting unit 21 detects the earthquake and the detecting unit 21 detects the earthquake. After that, the leakage current I4 (second leakage current) is compared (step ST5). In addition, even when the earthquake vibration is less than the predetermined seismic intensity in step ST2, the determination unit 14 detects the leakage current I4 before the detection unit 21 detects the earthquake and the leakage after the detection unit 21 detects the earthquake. The current I4 is compared (step ST5). Then, when the determination unit 14 determines that the usage state of electricity is normal from the comparison result in step ST5, the determination unit 14 does not output an abnormal signal to the interruption determination unit 22, and thus the main breaker 3 is not interrupted (step ST6). On the other hand, when the determination unit 14 determines that the electricity usage state is abnormal from the comparison result in step ST5, the determination unit 14 outputs an abnormal signal to the interruption determination unit 22, and the main breaker 3 is interrupted according to the abnormality signal (step ST7). Moreover, the determination part 14 makes the alerting | reporting part 15 alert | report that the usage condition of the electricity in the consumer facility 100 is abnormal (step ST8).

  As described above, in the abnormality determination system of the present embodiment, the leakage current I4 (first leakage current) measured before the earthquake is detected and the leakage current I4 (first leakage current) measured after the earthquake is detected. 2 leakage current). And the determination part 14 determines whether the usage condition of the electricity in the consumer facility 100 is normal from this comparison result. Thus, according to the abnormality determination system of the present embodiment, it is possible to determine whether or not the usage state of electricity in the customer facility 100 is normal only by comparing the first leakage current and the second leakage current. it can. That is, it is possible to determine whether there is an abnormality such as an electrical accident associated with an earthquake by simply comparing the first leakage current and the second leakage current.

  Moreover, in the interruption | blocking system of this embodiment, the determination part 14 is contained in the target branch circuit 4 among the main breaker 3 or several branch circuit 4A-4F, when it determines with the usage condition of electricity in a consumer facility being abnormal. Shut off the branch breaker. Thus, according to the interruption system of the present embodiment, when it is determined that the usage state of electricity in the customer facility is abnormal, the main breaker 3 or the branch breaker of the corresponding branch circuit 4 is cut off. It is possible to reduce abnormalities such as electrical accidents.

  Moreover, since the distribution board 10 of this embodiment is used for the above-mentioned interruption | blocking system, abnormality, such as an electrical accident accompanying an earthquake, can be reduced.

  By adopting the following abnormality determination method, functions equivalent to those of the abnormality determination system of the present embodiment can be realized without using the dedicated measurement unit 1 and seismic unit 2.

  That is, the abnormality determination method includes a detection step (step ST1 in FIG. 3), a measurement step, and a determination step (step ST5 in FIG. 3). The detection step is a step of detecting the occurrence of an earthquake. The measurement step is a step of measuring a leakage current I4 in the customer facility 100. The determination step is a step of determining whether or not the usage state of electricity in the customer facility 100 is normal based on the measurement result of the measurement step. In the determination step, it is determined whether or not the usage state of electricity in the customer facility 100 is normal from the comparison result between the first leakage current and the second leakage current. The first leakage current is the leakage current measured in the measurement step before the earthquake is detected in the detection step. The second leakage current is a leakage current measured in the measurement step after an earthquake is detected in the detection step.

  According to this abnormality determination method, it is possible to determine whether or not the usage state of electricity in the customer facility is normal only by comparing the first leakage current and the second leakage current. That is, it is possible to determine whether there is an abnormality such as an electrical accident associated with an earthquake by simply comparing the first leakage current and the second leakage current. Moreover, according to this abnormality determination method, the function equivalent to the abnormality determination system of this embodiment is realizable, without using the exclusive measurement unit 1 and the seismic unit 2.

  Moreover, when the determination part 14 makes a computer (a microcomputer is included) a main structure, the program recorded on the memory of a computer is a program for functioning a computer as the determination part 14. FIG. The determination unit 14 determines whether or not the usage state of electricity in the customer facility 100 is normal from the comparison result between the first leakage current and the second leakage current. The first leakage current is the leakage current I4 in the customer facility 100 measured by the measurement unit 11 before the earthquake is detected by the detection unit 21 that detects the occurrence of the earthquake. The second leakage current is the leakage current I4 in the customer facility 100 measured by the measurement unit 11 after the earthquake is detected by the detection unit 21 that detects the occurrence of the earthquake.

  According to this program, it is possible to determine whether or not the usage state of electricity in the customer facility is normal only by comparing the first leakage current and the second leakage current. That is, it is possible to determine whether there is an abnormality such as an electrical accident associated with an earthquake by simply comparing the first leakage current and the second leakage current. Moreover, according to this program, even if it does not use the exclusive measurement unit 1 and the seismic unit 2, the function equivalent to the abnormality determination system of this embodiment is realizable.

  Further, in the abnormality determination method described above, in the determination step, if the difference between the first leakage current and the second leakage current calculated as a comparison result between the first leakage current and the second leakage current is equal to or greater than a specified value, It is preferable to determine that the use state is abnormal. According to this configuration, it is possible to determine whether or not the usage state of electricity in the customer facility is normal only by comparing the difference between the first leakage current and the second leakage current and the specified value. However, this configuration is not an essential configuration of the abnormality determination method. For example, the configuration may be configured to determine whether or not the usage state of electricity is normal only by the magnitude of the first leakage current and the second leakage current. .

  Moreover, in the above-described abnormality determination method, in the determination step, when the second leakage current is equal to or greater than the first leakage current based on the comparison result between the first leakage current and the second leakage current, the usage state of electricity is determined to be abnormal. Is preferred. According to this configuration, it is possible to determine whether or not the usage state of electricity in the customer facility is normal only by comparing the magnitudes of the first leakage current and the second leakage current. However, this configuration is not an essential configuration of the abnormality determination method. For example, it is determined whether or not the usage state of electricity is normal by comparing the difference between the first leakage current and the second leakage current with a specified value. It may be configured.

  Moreover, it is preferable that the above-described abnormality determination method further includes a notification step (step ST8 in FIG. 3) for notifying the determination result of the determination step. According to this configuration, the determination result of the determination step can be notified to the user. However, this configuration is not an essential configuration of the abnormality determination method, and the notification step may be omitted.

  Moreover, in the above-described abnormality determination method, it is preferably used for the distribution board 10. The distribution board 10 distributes the power from the power line 5 to the plurality of branch circuits 4 via the main breaker 3 electrically connected to the power line 5. In this case, the first leakage current and the second leakage current are the leakage currents I4 in the plurality of branch circuits 4. In the determination step, it is determined whether or not the usage state of electricity is normal for each of the plurality of branch circuits 4. According to this configuration, since the determination process is performed for each branch circuit 4, there is an advantage that the corresponding branch circuit 4 can be specified and early response can be performed. However, this configuration is not an indispensable configuration of the abnormality determination method, and for example, the determination process may be performed based on the leakage current detected in the main breaker 3.

  Hereinafter, modifications of the present embodiment will be described.

  In the above-described embodiment, a detached house is described as an example of a customer facility. However, the present invention is not limited to this example, and the consumer facility is a house other than a detached house such as each dwelling unit of an apartment house, or an office. It may be a house such as a store.

  Moreover, in the above-mentioned embodiment, although the measurement part 11, the determination part 14, and the alerting | reporting part 15 are provided in the measurement unit 1, and the detection part 21 is provided in the seismic unit 2, for example, the measurement part 11, the determination part 14 The notification unit 15 and the detection unit 21 may be provided in one device. For example, the measurement unit 11, the determination unit 14, the notification unit 15, and the detection unit 21 may be provided in the measurement unit 1 or may be provided in the seismic unit 2.

  Furthermore, in the above-described embodiment, the case where the above-described abnormality determination method is used for the distribution board 10 has been described as an example. However, the application target of the above-described abnormality determination method is not limited to the distribution board 10, for example, a smart meter. There may be.

  Moreover, in the above-mentioned embodiment, although the measurement part 11, the calculating part 12, the memory | storage part 13, the determination part 14, and the interruption | blocking determination part 22 are provided in the distribution board 10, at least 1 of these is a power distribution. It may be provided outside the panel 10. Furthermore, at least one of the measurement unit 11, the calculation unit 12, the storage unit 13, the determination unit 14, and the blockage determination unit 22 is realized by a distributed computer such as a cloud (cloud computing). Also good.

  Furthermore, in the above-described embodiment, as shown in FIG. 3, the notification is performed after the main breaker 3 is shut off. However, for example, in the case of an electrical accident that does not require an emergency such as a leakage current, the main notification is performed. The breaker 3 may be shut off. Further, in the above-described embodiment, when the usage state of electricity in the customer facility is abnormal, the main breaker 3 is shut off. However, when the determination process is performed for each branch circuit 4, only the corresponding branch circuit 4 is applied. You may be comprised so that may be interrupted | blocked.

  Furthermore, in the above-described embodiment, the electric stove has been described as an example of the resistive load having a large power factor. However, the resistive load is not limited to the electric stove. Also good.

  In the above embodiment, the leakage current I4 is detected by the leakage detector 33 of the main breaker 3. For example, the first main current I1 flowing through the first voltage line 51 of the main breaker 3 and the branch circuits 4A to 4F are connected. The leakage current may be calculated from the difference from the flowing branch currents I31 to I36. Furthermore, in the above-described embodiment, the leakage current I4 is detected in the main breaker 3. However, the leakage current may be detected for each of the branch circuits 4A to 4F.

3 Main breaker 4, 4A-4F Branch circuit 5 Power line 10 Distribution board 11 Measuring unit 14 Judgment unit 21 Detection unit I4 Leakage current (first leakage current, second leakage current)
ST1 step (detection step)
ST5 Step (judgment step)
ST8 step (notification step)

Claims (9)

A detection step for detecting the occurrence of an earthquake;
A measurement step for measuring a leakage current in a customer facility;
Determining whether or not the usage state of electricity in the customer facility is normal based on the measurement result of the measurement step, and
In the determination step, the first leakage current which is the leakage current measured in the measurement step before the earthquake is detected in the detection step, and the measurement step is measured after the earthquake is detected in the detection step. And determining whether or not the usage state of the electricity is normal from a comparison result with a second leakage current that is the leakage current. In the determination step, when the difference between the first leakage current and the second leakage current calculated as a comparison result between the first leakage current and the second leakage current is a predetermined value or more, the usage state of the electricity The abnormality determination method according to claim 1, wherein the abnormality is determined to be abnormal. In the determining step, when the second leakage current is greater than or equal to the first leakage current based on a comparison result between the first leakage current and the second leakage current, the usage state of the electricity is determined to be abnormal. The abnormality determination method according to claim 1. The abnormality determination method according to claim 1, further comprising a notification step of notifying a determination result of the determination step. Used in a distribution board that distributes power from the power line to a plurality of branch circuits through a main breaker electrically connected to the power line,
The first leakage current and the second leakage current are the leakage currents in the plurality of branch circuits,
5. The abnormality determination method according to claim 1, wherein in the determination step, it is determined whether or not the electricity usage state is normal for each of the plurality of branch circuits. A detector that detects the occurrence of an earthquake;
A measurement unit for measuring a leakage current in a customer facility;
A determination unit that determines whether or not the usage state of electricity in the customer facility is normal based on a measurement result of the measurement unit;
The determination unit is measured by the measurement unit after the first leakage current, which is the leakage current measured by the measurement unit before the detection of the earthquake by the detection unit, and after the earthquake is detected by the detection unit. Further, it is determined whether or not the use state of the electricity is normal from a comparison result with the second leakage current that is the leakage current. Computer
The first leakage current measured by the measurement unit that measures the leakage current in the customer facility before the earthquake is detected by the detection unit that detects the occurrence of the earthquake, and the measurement unit after the earthquake is detected by the detection unit The program for functioning as a determination part which determines whether the usage condition of the electricity in the said consumer facility is normal from the comparison result with the 2nd earth-leakage current measured by (2). A distribution board that distributes power from the power line to a plurality of branch circuits via a main breaker electrically connected to the power line;
An abnormality determination system according to claim 6,
The said determination part interrupts | blocks the branch breaker contained in the target branch circuit among the said main breaker or these branch circuits, when it determines with the usage condition of the said electricity being abnormal. The interruption | blocking system characterized by the above-mentioned.   A distribution board for use in the shut-off system according to claim 8.

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