JP2010148165A - System for controlling trunk current of condominium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system for controlling a trunk current of a condominium that improves user friendliness. <P>SOLUTION: A current level determining device 12 measures the duration of a state in which the ratio of a trunk current passed from a trunk current detector 11 to the rated current of a trunk breaker Ba is in an overcurrent range, starting when it is determined that a limit time has been reached. When the duration exceeds one minute, two minutes, and four minutes, a transmitter 13 is caused to transmit a transmission signal instructing to reduce a threshold by one step. Hence, when a current supplied to a specific load Ld is limited but a trunk current is not reduced out of the overcurrent range, the number of dwelling houses as the targets of current limitation is increased with the duration during which current limitation is carried out. Accordingly, it is possible to avoid limitation of current supply to the specific load Ld at more dwelling houses than necessary and suppress the interruption of the trunk breaker Ba. As a result, users' convenience is enhanced. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is mainly used in an apartment house, and in a power wiring system in which a main breaker is installed in an electric circuit branched from a main line provided with a main line breaker to a plurality of dwelling units, a main line due to an increase in supply current to each dwelling unit The present invention relates to an apartment house main line current control system that suppresses breaker interruption.

  In general, in a housing complex, a plurality of dwelling units share one main line and main line breaker. In recent years, due to an increase in electrical equipment in each dwelling unit, the capacity of the main breaker arranged in each dwelling unit is insufficient. In order to cope with this, it is necessary to increase the capacity of the main line and the main line breaker which are shared parts.

  However, changing the rated current of the main breaker and main line involves a large-scale construction, so the main breaker and the main line rated current can be increased without changing the main line breaker and main line rated current, and the break of the main line breaker is suppressed. Is required to do.

  As a technology that satisfies this requirement, for example, a main line current detecting means (load monitoring control device) for detecting a current passing through the main line breaker and a current monitoring circuit for controlling the rated current of the main breaker provided in each dwelling unit are provided. Have been proposed (see, for example, Patent Document 1). In Patent Document 1, two stages of an upper rated current and a lower rated current are set as currents for interrupting the main breaker, and the current value detected by the main line current detecting means is 90% of the rated current of the main line breaker. A configuration is adopted in which the lower rated current is instructed to the current monitoring circuit when the above is reached, and the upper rated current is instructed to the current monitoring circuit when it becomes 70% or less of the rated current of the main circuit breaker.

  If the technique described in Patent Document 1 is adopted, if the current passing through the main breaker is 90% or more of the rated current of the main breaker, the current that can pass through the main breaker provided in each dwelling unit is smaller than usual. The current that can be used in each dwelling unit is limited due to the lower rated current. Therefore, it is possible to increase the rated current of the main breaker installed in each residential distribution board without changing the rated current of the main breaker or main line, and even if the rated current of the main breaker is increased in each dwelling unit It can be said that the interruption of the main breaker can be suppressed.

  However, in the technique described in Patent Document 1, when the rated current of the main breaker is 90% or more, the rated current of the main breaker in each dwelling unit is reduced to the lower rated current. The main breaker is shut off at the dwelling unit used. That is, although the interruption of the main breaker can be suppressed, the interruption frequency of the main breaker in each dwelling unit may increase.

  When electric devices such as IH cooking heaters and hot water heaters with relatively large maximum power consumption are used in a single day but with a short maximum usage time, these types of electric devices are used at the same time in dwelling units with similar life time zones. Then, the lower rated current is adopted in each dwelling unit, and the main breaker is easily cut off. As a result, there arises a problem that the use of this type of electrical equipment is restricted in the consumer.

  In order to solve such a problem, the present applicant has already proposed an apartment house main line current control system disclosed in Patent Document 2.

  Hereinafter, a conventional example described in Patent Document 2 will be described.

  In this conventional example, as shown in FIG. 5, it is assumed that the housing distribution board 2 is provided for each dwelling unit in the building M of the apartment house. One line of the trunk line La is wired to the building M, the trunk line breaker Ba is installed on the trunk line La, and the branch line is branched to a plurality of branch lines Lb (three lines in the illustrated example) downstream of the trunk line breaker Ba. To do. In the residential distribution board 2, a main breaker Bc is housed as an internal unit, and a main breaker Bc is installed on an electric circuit (hereinafter referred to as “dwelling unit line”) Lc branched from each branch main line Lb for each dwelling unit. The main line breaker Ba is housed in the main line branch board 1. In the trunk line La, a transformer T is installed on the upstream side of the trunk line breaker Ba, and AC 100V and 200V are supplied to the trunk line La by a single-phase three-wire.

  In addition to the main line breaker Ba, the main line branch board 1 samples the current transformer CTa for detecting the main line current passing through the main line breaker Ba downstream of the main line breaker Ba, and the secondary output of the current transformer CTa to sample the main line La. A main line current monitoring device 11 for obtaining a main current passing therethrough at every sampling time is housed, and a state in which the main line current obtained by the main line current monitoring device 11 is an overcurrent region of the main line breaker Ba reaches a specified time limit. The current level determination device 12 for determining whether or not the current time determination device 12 determines that the time limit has been reached, and the housing of each dwelling unit that houses the main breaker Bc downstream of the main breaker Ba The distribution board 2 accommodates a transmission device 13 that transmits a transmission signal.

  The current transformer CTa detects the current passing through the two voltage lines excluding the neutral line in the main line La, and the main line current monitoring device 11 is the larger of the currents passing through the two voltage lines. Is used as the main current. That is, the current transformer CTa and the main line current monitoring device 11 constitute the main line current detecting means because the current value of the main line current is detected. The trunk current monitoring device 11 does not deliver the current value of the trunk current to the current level determination device 12, but delivers it as a ratio (percentage) of the trunk current to the rated current of the trunk breaker Ba.

  In the current level determination device 12, as will be described later, in the overcurrent region of the main line breaker Ba, a current level is set in which the ratio of the current value of the main line current to the rated current of the main line breaker Ba is divided into a plurality of sections. The time limit is defined in association with each current level, and the current level determination device 12 determines whether or not the duration of the state that is equal to or higher than each current level has reached the time limit.

  The transmission device 13 transmits a transmission signal triggered by the determination that the current level determination device 12 has reached the time limit. The transmission signal is a signal notifying that the current level determination device 12 has determined that the time limit has been reached, and is transmitted using an appropriate transmission format in order to distinguish it from noise.

  On the other hand, in addition to the main breaker Bc, the residential distribution board 2 includes a branch breaker Bb installed in each of a plurality of electric circuits branched downstream of the main breaker Bc, and a current passing through the main breaker Bc (that is, at each dwelling unit). A current transformer CTc that detects the current used) upstream of the main breaker Bc, and a dwelling current monitoring device 21 that samples the secondary output of the current transformer CTc and obtains the current passing through the main breaker Bc at each sampling time. And a load control device (load control means) 22 for limiting a current supplied to a specific load Ld connected downstream of the branch breaker Bb, and a transmission device 13 provided on the main branch board 1 And a receiving device (receiving means) 23 for receiving the transmission signal.

  The trunk line La, the branch trunk line Lb, and the dwelling unit line Lc are used for the transmission path of the transmission signal between the transmitter 13 and the receiver 23. That is, a signal is transmitted using a power line. This type of technology is known as power line communication (PLC), and in this conventional example, only a notification that the time limit has been reached is used. Therefore, a transmission signal is transmitted using the technology of low speed power line communication. By transmitting the transmission signal using the power line communication technique, it is not necessary to separately wire the communication line. Even in the existing building M, transmission signals can be transmitted by using the trunk line La, the branch trunk line Lb, and the dwelling unit line Lc. A broken line in FIG. 5 indicates a transmission signal path between the transmission device 13 and the reception device 23.

  Since the main breaker Bc is connected to the single-phase three-wire dwelling unit line Lc, the current transformer CTc detects the current passing through the two voltage lines excluding the neutral line, like the current transformer CTa. To do. Moreover, the dwelling unit current monitoring apparatus 21 employs the larger of the currents passing through the two voltage lines as the dwelling unit current. Since the current transformer CTc and the dwelling unit current monitoring device 21 detect the current value of the dwelling unit current, they constitute dwelling unit current detection means.

  However, the dwelling unit current monitoring device 21 does not always detect the dwelling unit current, but detects the dwelling unit current when the receiving device 23 receives the transmission signal from the transmitting unit 13. In other words, when the receiving device 23 receives the transmission signal from the transmitting device 13 when the current level determining device 12 determines that the time limit has been reached, the dwelling unit current monitoring device 21 receives the secondary current of the current transformer CTc. Instruct to detect the dwelling unit current using the output.

  When the current value of the dwelling unit current is equal to or greater than the threshold value defined for the rated current of the main breaker Bc, the dwelling unit current measuring apparatus 21 instructs the load control unit 22 to limit the current supplied to the load Ld. To do. For example, the threshold value is set to 50% of the rated current (of course, 50% is an example, and other ratios may be used). If the current value of the dwelling unit current is less than the threshold value, the dwelling unit current monitoring device 21 does not instruct the load control unit 22 to limit the current supplied to the load Ld, and the current supplied to the load Ld is maintained as it is.

  A configuration example of the current transformer CTc, the dwelling unit current monitoring device 21, the load control device 22, and the receiving device 23 is shown in FIG. The dwelling unit current monitoring device 21, the load control device 22, and the receiving device 23 include power supply circuit units 21a, 22a, and 23a, respectively, and operate independently. Moreover, the dwelling unit current monitoring device 21, the load control unit 22, and the receiving unit 23 include communication units 21b, 22b, and 23b, respectively. By using the communication units 21b, 22b, and 23b, the dwelling unit current monitoring unit is changed from the receiving unit 23 to the dwelling unit current monitoring unit. 21 is notified of reception of the transmission signal, and instructs the load control device 23 to limit the current supplied to the load Ld from the dwelling unit current monitoring device 21. Furthermore, the dwelling unit current monitoring device 21, the load control device 22, and the receiving device 23 are provided with CPU units 21c, 22c, and 23c each including a microcomputer on which a program is mounted so as to perform the above-described operations.

  The receiving device 23 includes a PLC communication unit 23d connected to the residential line Lc, and a main line ID setting unit 23e that sets an ID (identification code) for the transmitting device 13 to identify the receiving device 23. The ID set in the main line ID setting unit 23e does not need to be given so as to identify the receiving device 23 individually, and is the same as the receiving device 23 of the residential distribution board 2 existing downstream of the main line breaker Ba. Give an ID.

  The transmission device 13 transmits the transmission signal with an ID added thereto, and the reception device 23 transmits the ID added to the transmission signal received from the transmission device 13 by the PLC communication unit 23d, and the main line ID setting unit 23e in the CPU unit 23c. When both IDs match with each other, the communication unit 21b of the dwelling unit current monitoring device 21 is notified that the transmission signal from the transmission device 13 has been received via the communication unit 23b.

  The dwelling unit current monitoring device 21 samples a secondary output of the current transformer CTc, performs A / D conversion, and supplies it to the CPU unit 21c, and a rated current setting unit 21e that sets the rated current of the main breaker. Is provided. When the reception of the transmission signal is notified from the receiving device 23, the CPU unit 21c acquires the dwelling unit current from the current detection unit 21d, and the rated current of the main breaker Bc provided in the residential distribution board 2 (as described later, If there is a current limiter, the ratio of the dwelling unit current to the contracted current capacity of the current limiter is obtained, and further, it is determined whether or not to limit the current supplied to the load Ld. When limiting the current supplied to the load Ld, the communication unit 23b of the load control device 22 is instructed to perform load control through the communication unit 21b. The rated current (or contract current capacity of the current limiter) of the main breaker Bc is set by the rated current setting unit 21e.

  The load control device 22 includes a relay 22e having a contact inserted in a path for supplying power to the load Ld, and a relay control circuit unit 22d serving as an interface for the CPU unit 22c to control the relay 22e. The relay 22e is accommodated in the residential distribution board 2. When load control is instructed from the dwelling unit current monitoring device 21, the CPU 22c of the load control device 22 turns off the contact of the relay 22e through the relay control circuit 22d and cuts off the power supply to the load Ld.

  With the above configuration, when transmission signals are transmitted all at once from the transmission device 13 of the main branch board 1 to the reception devices 23 of the residential distribution boards 2 of the plurality of dwelling units (usually, they are present downstream of the main circuit breaker Ba). A transmission signal is transmitted all at once to all the receiving devices 23 of the residential distribution board 2), and is supplied to the load Ld only when the passing current (unit current) of the main breakers Bc of each unit is equal to or higher than the above threshold. Current is limited. On the other hand, the current supplied to the load Ld provided downstream of the main breaker Bc whose dwelling current is less than the above-described threshold is not limited.

  That is, the current supplied to the load Ld is limited in a dwelling unit with a large amount of power consumed when the transmission signal is transmitted, and the current supplied to the load Ld is limited in a dwelling unit with low power consumption. There is no. In other words, with regard to the load Ld for which the supplied current is limited, the priority is defined by the magnitude of the dwelling unit current at the time when the transmission signal is received. In addition, since the dwelling unit current is large, there is a high possibility that a load having a large maximum power consumption is used in the dwelling unit. The rate at which current is reduced increases. That is, the main line current can be reduced more quickly than when the current supplied to the load Ld is limited in a dwelling unit whose dwelling current is equal to or less than the threshold value.

  In the above example, the threshold value is set based on the rated current of the main breaker Bc. However, in the residential distribution board 2, a current limiter (limiter) that defines a contract current capacity upstream of the main breaker Bc is used. In such a case, the threshold value may be set using the contract current capacity of the current limiter as a reference. This configuration is equivalent to defining the threshold for the rated current of the main breaker Bc in terms of setting the threshold.

  In the load control device 22, as a configuration for limiting the current supplied to the load Ld, either a configuration for opening / closing a path for supplying power to the load Ld or a configuration for adjusting the output of the load Ld is adopted. The configuration for adjusting the output of the load Ld needs to include a control terminal at the load Ld. Even when the load Ld is provided with a control terminal, there are cases in which only the load Ld can be controlled, such as the JEM-A standard HA terminal.

  The load Ld controlled by the load control device 22 is selected so as not to cause inconvenience to the user even if the supplied current is limited. For example, hot-water storage water heaters, floor heaters, air conditioners, etc. are only slightly reduced in convenience even if the power is temporarily shut off, and there is no impact on safety like turning off the lights. It is desirable to select the seed load Ld. Further, since these loads have a large maximum power consumption, it can be said that the effect of reducing the main line current passing through the main line breaker Ba is great when the supplied current is limited.

  By the way, the time limit determined by the current level determination device 12 is set based on the characteristics of the overcurrent region of the main line breaker Ba. The operating time in the overcurrent region of the main breaker Ba has a characteristic as shown by the hatched portion in FIG. The horizontal axis in FIG. 7 represents the ratio (percentage) of the main line current to the rated current of the main line breaker Ba, and the vertical axis represents the operating time. The operation time of the main line breaker Ba with respect to the main line current has a range in time due to environmental variations such as product variations and ambient temperature.

  In the example shown in FIG. 7, the operation time when a main current of 125% with respect to the rated current flows has a wide range of about 8 minutes to about 3 hours, but the lower limit value of the operation time is about 8 Minutes. That is, when a main line current of 125% with respect to the rated current continues to flow, the main line breaker Ba performs a tripping operation and is cut off in about 8 minutes. On the other hand, if it is shorter than the lower limit value of the operation time, the main line breaker Ba does not operate and the current can continue to flow through the main line La. That is, since the operation is delayed in the overcurrent region, the current can continue to flow without shutting off the main line breaker Ba within the lower limit of the operation time.

  As is apparent from FIG. 7, the operating time (the lower limit value thereof) changes at a rate with respect to the rated current, and becomes longer as the rate with respect to the rated current is smaller. The above-mentioned time limit is set in a range shorter than the operation time (the lower limit value thereof), and the current supplied to the load Ld is limited when the time limit is reached. Therefore, the main current can flow at least until the time limit. . For example, if the time limit is set within a region surrounded by a one-dot chain line in FIG. 7, the main circuit breaker Ba is not shut off even in the overcurrent region, and power can be continuously supplied to the load.

By the way, as described above, the time required to limit the current supplied to the load by the load control device 22 after it is determined by the current level determination device 12 that the time limit has been reached is the transmission device 13 and the reception device 23. Therefore, it is desirable that the time limit for each current value is a time obtained by subtracting the time required for communication from the operation time (the lower limit value thereof). If the time limit is set in this way, the current supplied to the load is limited after the time required for communication has elapsed since the time limit is reached, and the main current passing through the main circuit breaker Ba is reduced. The main line current can be reduced within a time within the operation time (the lower limit thereof) after the current reaches the overcurrent region. That is, as much current as possible can be allowed to flow as the main line current without interrupting the main line breaker Ba.
JP 2004-153963 A JP 2008-178275 A

  As described above, according to the conventional example described in Patent Document 2, when the current flowing in the trunk line La is in the overcurrent region reaches the time limit, the dwelling current in each dwelling unit is the rated current of the main breaker Bc. Since the current supplied to the specific load of the dwelling unit that is equal to or greater than the threshold specified for is limited, even when the rated current of the main breaker of each dwelling unit is increased, the interruption of the main breaker Ba is suppressed, and Even when using an electric device having a relatively large maximum power consumption, there is an advantage that the main breaker Bc of each dwelling unit is not shut off.

  By the way, in the conventional example described in Patent Document 2, even if the state where the main line current is in the overcurrent region exceeds the time limit, the specific load Ld that is the target of current limit operates in all the dwelling units. Not necessarily. Therefore, even if the current supplied to the specific load Ld is limited in each dwelling unit, the main line current does not decrease sufficiently, and as a result, the main line breaker Ba may be cut off and the convenience for the user may be reduced. .

  This invention is made | formed in view of the said situation, The objective is to provide the housing complex main line current control system which can improve a user's convenience.

  In order to achieve the above object, the invention according to claim 1 is a main circuit breaker installed on a main line that distributes power to a plurality of dwelling units, and a dwelling unit that is respectively installed on an electric circuit branched from the main line to each dwelling unit downstream of the main line breaker. A plurality of main breakers housed in a residential distribution board arranged on the main line, a main line current detecting means for detecting a main line current passing through the main line breaker, and a main line current detected by the main line current detecting means is an overcurrent in the main line breaker Current level determination means for determining whether the state of the region has reached a time limit defined according to the current value, dwelling current detection means for detecting the current passing through the main breaker, and current level determination Means that the time limit has been reached and the current value detected by the dwelling unit current detection unit is less than the threshold specified for the rated current of the main breaker for each dwelling unit. A load control means for limiting a current supplied to a specific load provided in the dwelling unit for which the current value detected by the dwelling current detection means is equal to or greater than a threshold, the load control means, Starting from the time point when the current level determining means determines that the time limit has been reached, the duration of the state where the main line current detected by the main line current detecting means is in the overcurrent region is counted, and the duration time becomes longer. Therefore, the threshold value is lowered.

  According to the first aspect of the present invention, when the current supplied to a specific load is limited but the main line current does not decrease beyond the overcurrent region, the number of dwelling units subject to current limitation increases according to the duration. Therefore, it is possible to suppress the interruption of the main circuit breaker while avoiding the current supply to the specific load being restricted by more dwelling units than necessary, which is convenient for users (residents of dwelling units). Improves.

  According to a second aspect of the present invention, in the first aspect of the present invention, in each of the dwelling units, a notification means for notifying that the current is limited before the current supplied to the specific load is limited by the load control means. It is characterized by that.

  According to the invention of claim 2, since the user (resident of each dwelling unit) is notified in advance that the current supply to the specific load is restricted, the current supply is restricted without the user knowing. Compared to the case, the convenience of the user is improved, and the user can be urged to refrain from the power consumption voluntarily, and the interruption of the main line breaker can be further suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, interruption | blocking of a main line breaker can be suppressed, avoiding restricting the electric current supply to a specific load with many dwelling units more than necessary, and the convenience of a user (resident of dwelling unit). Will improve.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, since the system configuration of this embodiment is the same as that of the conventional example described in Patent Document 2, the same reference numerals are assigned to the common components, and the description and illustration are omitted, and the conventional configuration is used as necessary. Reference is made to the example drawings (FIGS. 5-7).

(Embodiment 1)
In the present embodiment, as shown in FIG. 3, the overcurrent region is divided into a plurality of sections (two sections in the illustrated example) P1 and P2, a threshold is defined for each section P1 and P2, and the overcurrent level is high. The threshold value is set lower for the interval. In the present embodiment, the overcurrent region is divided into two sections P1 and P2, but may be divided into three or more sections.

  In the present embodiment, the section P1 has a trunk line current of more than 100% to 150% with respect to the rated current, the section P2 has more than 150%, the threshold in the section P1 is set to 75% of the rated current of the main breaker Bc, The threshold value in the section P2 is set to 0% of the rated current. However, these threshold values are examples, and other values may be set.

  Thus, in the current level determination device 12, the duration of the state in which the ratio (percentage) of the trunk current delivered from the trunk current monitoring device 11 to the rated current of the trunk breaker Ba is in the overcurrent region has reached the time limit. When the determination is made, information (section information) indicating to which of the two sections P1 and P2 the ratio of the current value of the main line current at the time of the determination belongs is transmitted to the transmission device 13. The transmission device 13 transmits a transmission signal triggered by the fact that the section information has been delivered from the current level determination device 12. However, the transmission signal in the present embodiment is a signal for notifying that the current level determination device 12 has determined that the time limit has been reached and the section information.

  On the other hand, when the transmission signal is received by the PLC communication unit 23d of the reception device 23 installed in each dwelling unit, the CPU unit 23c of the reception device 23 communicates with the communication unit 21b of the dwelling unit current monitoring device 21 via the communication unit 23b. To receive the transmission signal from the transmission device 13 and the section information. In the dwelling unit current monitoring device 21, when the CPU unit 21c receives the transmission signal and the section information from the receiving unit 23, the CPU unit 21c acquires the dwelling unit current from the current detection unit 21d, and the main unit provided in the housing distribution board 2 The ratio of the dwelling unit current to the rated current of the breaker Bc (if the current limiter is present, the contracted current capacity of the current limiter) is obtained, and the current supplied to the load Ld is limited by comparing the ratio of the dwelling unit current with a threshold value. Decide whether or not to do. At this time, the CPU unit 21c alternatively selects a threshold value to be compared with the ratio of the dwelling unit current based on the section information. For example, if the section information indicates the section P1, the threshold value is set to 75%. If the information indicates the section P2, the threshold is set to 0%. When limiting the current supplied to the load Ld, the CPU unit 21c instructs the communication unit 23b of the load control device 22 to perform load control through the communication unit 21b.

  And when the load control is instructed from the dwelling unit current monitoring device 21, the CPU 22 c of the load control device 22 turns off the contact of the relay 22 e through the relay control circuit 22 d and cuts off the power supply to the load Ld.

  Thus, in the present embodiment, the overcurrent region is divided into a plurality of sections P1 and P2, and a threshold is defined for each section P1 and P2, and the threshold is defined to be lower in a section where the overcurrent level is higher. When the level of overcurrent flowing through the main line breaker Ba is relatively low, the number of dwelling units subject to current restriction is relatively small, and as the level of overcurrent flowing through the main line breaker Ba becomes high, the current restriction target The number of dwelling units will increase. Therefore, the number of dwelling units whose current supplied to the specific load Ld is limited can be increased or decreased according to the level of overcurrent flowing through the main line breaker Ba, and the convenience of the user (resident of dwelling unit) can be increased. improves. In particular, there is an advantage that the total number of dwelling units subject to current limitation can be reduced in an apartment house where the main line current is frequently in an overcurrent state with a low degree of tightness.

  Next, the point which becomes the summary of this embodiment is demonstrated.

  As described in the related art, just because the state in which the main line current is in the overcurrent region exceeds the time limit, the specific load Ld that is the target of current limitation is not always operating in all the dwelling units. . Therefore, especially in the section P1 where the threshold value is set to a low value, even if the current supplied to the specific load Ld is limited in each dwelling unit, the main line current does not decrease sufficiently, and as a result, the main line breaker Ba is cut off. There is a risk of it.

  Therefore, in the present embodiment, the ratio of the main line current passed from the main line current detection device 11 to the rated current of the main line breaker Ba is the overcurrent region starting from the time point when the current level determination device 12 determines that the time limit has been reached. The time duration of the state is counted, and when the duration exceeds 1 minute, 2 minutes, or 4 minutes, a transmission signal for instructing to decrease the threshold value by one step is transmitted from the transmission device 13.

  On the other hand, when the transmission signal is received by the PLC communication unit 23d of the reception device 23 installed in each dwelling unit, the CPU unit 23c of the reception device 23 communicates with the communication unit 21b of the dwelling unit current monitoring device 21 via the communication unit 23b. Is instructed to decrease the threshold by one step. In the dwelling unit current monitoring device 21, when the CPU unit 21c is instructed by the receiving device 23 to lower the threshold by one step, for example, when the duration exceeds 1 minute, the threshold is set to the rated current of the main breaker Bc. When the duration time exceeds 2 minutes, the threshold value is reduced from 50% to 25% of the rated current of the main breaker Bc, and when the duration time exceeds 4 minutes, the threshold value is reduced to the main breaker. Reduce from 25% of the rated current of Bc to 0%. That is, as shown in FIG. 1, the duration time is divided into four periods of 0 to 1 minute period T1, 1 minute to 2 minutes period T2, 2 minutes to 4 minutes period T3, and 4 minutes period T4. The threshold of T1 is 75% of the rated current of the main breaker Bc, the threshold of period T2 is 50% of the rated current of the main breaker Bc, the threshold of period T3 is 25% of the rated current of the main breaker Bc, and the threshold of period T4 is main. The rated current of the breaker Bc is 0%.

  For example, when the current level determination device 12 determines that the duration has exceeded one minute, a transmission signal instructing to lower the threshold value by one step is transmitted from the transmission device 13, and the transmission signal is received by the reception device 23. Then, the CPU unit 21c of the dwelling unit current monitoring device 21 reduces the threshold value from 75% to 50% of the rated current of the main breaker Bc. Furthermore, even if the threshold value is reduced to 50%, the trunk current does not decrease outside the overcurrent region, and if the current level determination device 12 determines that the duration has exceeded 2 minutes, the threshold value is set to one level from the transmission device 13. When a transmission signal instructing to be lowered is transmitted and the transmission signal is received by the receiving device 23, the CPU unit 21c of the dwelling current monitoring device 21 lowers the threshold value from 50% to 25% of the rated current of the main breaker Bc. Let Furthermore, if the current level determination device 12 determines that the main current does not decrease beyond the overcurrent region even if the threshold value is reduced to 25% and the duration exceeds 4 minutes, the threshold value is set to 1 from the transmission device 13. When a transmission signal instructing to lower the level is transmitted and the transmission signal is received by the receiving device 23, the CPU unit 21c of the dwelling current monitoring device 21 changes the threshold from 25% to 0% of the rated current of the main breaker Bc. Reduce.

  Therefore, when the current supplied to the specific load Ld is limited, if the main line current does not decrease beyond the overcurrent region, the number of dwelling units subject to current limitation is determined according to the duration of current limitation. Since it will increase, it is possible to suppress the interruption of the main breaker Ba while avoiding the current supply to the specific load Ld being restricted by more dwelling units than necessary, and as a result, the convenience of the user Will be improved.

  By the way, in the conventional example described in Patent Document 2, when the CPU unit 21c of the dwelling unit current monitoring device 21 determines that the dwelling unit current is equal to or greater than the threshold, the load control unit 22 immediately restricts the current supply to the load Ld. Yes. However, since the dwelling unit current includes not only the current that flows through the load Ld to be controlled but also the current that flows through the load that is not the control target, the current flows through the load that is not the control target even if the load Ld that is the control target is not operating. There is a possibility that the dwelling unit current becomes equal to or greater than the threshold because the current temporarily increases. In this case, when the current supply to the load Ld to be controlled is restricted, it does not contribute to the reduction of the trunk current, but rather the current supply to the load Ld that is not operating is restricted, thereby restricting the user (the resident of the dwelling unit). ) May be impaired.

  Therefore, in the present embodiment, as shown in FIG. 2, a transmission signal notifying that the current level determination device 12 has reached the time limit and section information is transmitted, and the dwelling unit 23 receives the transmission signal from the receiving device 23. When the reception of the transmission signal and the section information are notified to the CPU unit 21c of the current monitoring device 21, the dwelling unit current is equal to or greater than the threshold value until the predetermined waiting time (30 seconds in the illustrated example) T0 elapses. Whether or not to determine whether or not. Therefore, even if the dwelling unit current becomes equal to or higher than the threshold value because the current flowing through the load that is not controlled is temporarily increased, such a temporary increase in the dwelling unit current is normally considered to converge within the waiting time T0. If the CPU unit 21c determines whether the dwelling unit current is equal to or greater than the threshold after the standby time T0 has elapsed, it is determined whether the dwelling unit current is equal to or greater than the threshold due to the influence of the current flowing through the load Ld to be controlled. can do.

(Embodiment 2)
In the present embodiment, as shown in FIG. 4, it is determined that the dwelling unit current is equal to or greater than the threshold value, and the dwelling unit current monitoring device 21 instructs the load control unit 22 to limit the current supplied to the load Ld. Before the operation is performed, a notification device (notification means) 24 for notifying the user (resident of the dwelling unit) that the current supply to the load Ld is restricted is characterized in that each dwelling unit is provided. However, in this embodiment, the trunk line La is branched into two systems of trunk lines La1 and La2 downstream of the trunk line breaker La, and not only the trunk line breaker Ba is installed in the trunk line La, but also the trunk line for each of the trunk lines La1 and La2. The case where breakers Ba1 and Ba2 are installed is illustrated. Here, branching the trunk line La into two systems is an example, and it goes without saying that the trunk line La may be branched into three or more systems.

  When the CPU unit 21c of the dwelling unit current monitoring device 21 determines to limit the current supplied to the load Ld, the CPU 21c notifies the communication unit 23b of the load control device 22 through the communication unit 21b before instructing the load control. The device 24 is instructed to sound a notification sound.

  On the other hand, when the notification device 24 is instructed to sound a notification sound from the dwelling unit current monitoring device 21 through a communication unit (not shown), for example, a buzzer sound or a voice message (“Current supply to XX is limited from now on”. Etc.) from the speaker. In addition, since the user can be informed in advance that the current supply to the load Ld at home is limited by a buzzer sound or a voice message ringed from the notification device 24, the user voluntarily consumes power. It can be expected that the load Ld is stopped in order to suppress it.

  Then, in the CPU unit 21c of the dwelling unit current monitoring device 21, after a predetermined time (for example, several tens of seconds to several minutes) has elapsed since the notification device 24 was instructed to ring through the communication unit 21b, the communication unit 21b. The load control device 22 of the load control device 22 is instructed to perform load control.

  Thus, according to the present embodiment, since the user (resident of each dwelling unit) is notified in advance that the current supply to the specific load Ld is restricted, the current supply is restricted without the user knowing. Therefore, the convenience of the user is improved as compared with the case where the user breaks down, and the user can be urged to voluntarily refrain from power consumption, and the interruption of the main breaker Ba can be further suppressed.

It is operation | movement explanatory drawing of Embodiment 1 of this invention. It is operation | movement explanatory drawing same as the above. It is operation | movement explanatory drawing same as the above. It is a block diagram which shows Embodiment 2 of this invention. It is a block diagram which shows a prior art example. It is a principal part block diagram of the residential distribution board used for the same as the above. It is principle explanatory drawing same as the above.

Explanation of symbols

1 Branch distribution board 2 Residential distribution board 11 Trunk current monitoring device (trunk current detection means)
12 Current level determination device (current level determination means)
13 Transmitting device (transmitting means)
21 dwelling unit current monitoring device (dwelling unit current detection means)
22 Load control device (load control means)
23 Receiving device (receiving means)
Ba Trunk breaker Ba1, Ba2 Trunk breaker Bc Main breaker CTa Current transformer (trunk current detection means)
CTa1, CTa2 Current transformer (Main current detection means)
CTc current transformer (unit current detection means)
La trunk line La1, La2 trunk line

Claims (2)

A main circuit breaker installed on a main line that distributes power to multiple units, and a plurality of mains housed in a residential distribution board installed in each dwelling unit that is installed on the electric circuit branched from the main line to each dwelling unit downstream from the main line breaker Breaker, main line current detecting means for detecting main line current passing through the main line breaker, and a state in which the main line current detected by the main line current detecting means is an overcurrent region in the main line breaker is defined according to the current value. Current level determination means for determining whether or not the time limit has been reached, dwelling current detection means for detecting the current passing through the main breaker, and dwelling current detection means that has been determined that the time limit has been reached by the current level determination means Detected by the dwelling unit current detection means when the current value detected in the above is greater than the threshold value specified for the rated current of the main breaker for each dwelling unit And a load control means for limiting the current current values are supplied to a particular load provided on the dwelling unit is equal to or greater than the threshold,
The load control means measures the duration of the state in which the main line current detected by the main current detection means is an overcurrent region, starting from the time when the current level determination means determines that the time limit has been reached, The apartment house trunk line current control system, wherein the threshold value is lowered as the duration time increases.   2. An apartment house according to claim 1, wherein a notification means for notifying that the current is restricted before the current supplied to the specific load is restricted by the load control means is provided in each dwelling unit. Main line current control system.

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