JP2011002363A - Electric power monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric power monitoring system which stores the history of accumulated electric energy of a load for a long term and store monthly history of the accumulated electric energy of a load preferentially for a long term.SOLUTION: The electric power measuring apparatus 1 includes a control section 11 which stores accumulated electric energy determined by a calculation section 10 for determining accumulated electric energy supplied to the load 5 within a predetermined term using an instantaneous voltage value and an instantaneous current value measured by a measuring means and the present date and time measured by a time measuring section 12 in association with each other in a storage section 13 as a history and deletes a history of which the term from its storage to the present time has exceeded a predetermined term from the storage section 13. The storage section 13 includes a first storage section 13a for storing the history of daily accumulated electric energy by unit and a second storage section 13b for storing the history of monthly accumulated electric energy by unit, where the second storage section 13b has a longer history storage term than that of the first storage section 13a.

Description

  The present invention relates to a power measurement system that measures the amount of power of a load connected to a distribution board, and a power monitoring system that includes a power measurement device and an interphone master unit that is connected so that data can be transmitted and received and notifies the amount of power.

  2. Description of the Related Art Conventionally, there has been known a system that can transmit and receive signals between a power distribution board installed in each dwelling unit of a detached house or an apartment house and a housing information board (interphone master unit). Is disclosed. In this conventional example, the power supplied to the dwelling unit is monitored and distributed between the power distribution board to the branch circuit to which the load is connected, and the housing information board to which various security sensors such as fire detectors are connected. The power distribution board is provided with a controller (power measurement device) that measures at least the amount of current supplied through the main breaker. The integrated electric energy accumulated by the controller is signaled to the housing information panel as electricity usage information, and the housing information panel notifies in stages according to the level of the accumulated energy measured by receiving the electricity usage information. (For example, a voice message “Too much electricity is used” is output). Thus, it is possible to grasp the electricity usage information at a place that is easily noticeable by residents, such as a living room or a dining room where a housing information board is installed.

JP-A-11-225438

  By the way, in the conventional system as described above, a history of the integrated power amount supplied to the measured load is stored in the interphone master unit. However, interphone master units that are constrained by shape and dimensions are also limited by the memory installation space for storing the accumulated power consumption history of the load, so the memory storage capacity is limited and load integration is limited. There is a problem that it is difficult to store a history of electric energy for a long time. In addition, when the limit of the storage capacity of the memory is reached, regardless of the type of integrated power consumption of the load (for example, the integrated power amount of the daily unit load or the integrated power amount of the monthly unit load). Since it is deleted from the old data, there is a problem that the history of the accumulated electric energy of the monthly load, which is relatively important data, cannot be stored for a long time. For this reason, for example, there has been a problem that it is not possible to compare the integrated power amounts of loads such as comparing the integrated power amounts of loads in an arbitrary month over the past several years.

  The present invention has been made in view of the above points, and can store a history of integrated power consumption of a load for a long period of time and prioritize a history of integrated power consumption of a monthly unit for a long period of time. An object of the present invention is to provide a power monitoring system capable of storing data.

  In order to achieve the above object, the first aspect of the invention monitors the power supplied to the dwelling unit, measures the current and voltage in the distribution board to be branched and supplied to the branch circuit connected to the load, and supplies the load to the load A power measuring device that calculates the amount of power to be transmitted and an interphone parent device installed in the dwelling unit, and transmits information on the amount of power supplied to the load calculated in the power measuring device to the interphone parent device, A power monitoring system for notifying a resident of the amount of power supplied to a load based on information received by an interphone master unit, wherein the power measurement device measures a voltage and a current supplied to the load via a power line A measuring means, a computing means for obtaining an integrated power amount supplied to the load during a specified period using the instantaneous voltage value and instantaneous current value measured by the measuring means, and an integrated value supplied to the load obtained by the computing means The storage means for storing the power, the time measuring means for measuring the current date and time, the accumulated power amount obtained by the computing means and the date and time measured by the time measuring means are associated with each other and stored in the storage means as a history, And a control unit that deletes from the storage unit a history in which the period from the storage to the present exceeds the predetermined period, and the storage unit stores a history of the integrated power consumption in units of one day for each unit. And a second storage unit that stores a history of the accumulated electric energy in units of one month for each unit, and the second storage unit has a longer period of storing and holding the history than the first storage unit. It is characterized by that.

  According to the present invention, the storage unit is provided in the power measurement device that is not restricted in shape and size compared to the interphone base unit, so that the storage capacity of the storage unit is compared with the case where the storage unit is provided in the interphone base unit. Thus, the history of the accumulated power supplied to the load can be stored for a long time. In addition, since the history of the integrated power amount of the monthly unit load is stored and held longer than the history of the integrated power amount of the daily unit load, the history of the integrated power amount of the monthly unit is given priority over a long period of time. Can be remembered.

1 is a block diagram showing an embodiment of a power monitoring system according to the present invention. It is a whole schematic diagram same as the above. It is a flowchart figure for demonstrating main operation | movement same as the above.

  Hereinafter, embodiments of a power monitoring system according to the present invention will be described with reference to the drawings. In the present embodiment, as shown in FIG. 1, the current in the distribution board 3 that monitors the power supplied to the dwelling unit and branches and supplies it to a branch circuit connected with one or more (two in the drawing) loads 5. And a power measuring device 1 that measures the voltage and calculates the amount of power supplied to the load 5, and an interphone master unit 2 installed in the dwelling unit.

  As shown in FIG. 1, the power measuring device 1 includes a calculation unit 10 that calculates an integrated power amount supplied to the load 5, a control unit 11 that controls the whole, and a clock unit 12 that clocks the current date and time. A storage unit 13 that stores the integrated power amount supplied to the load 5 calculated by the calculation unit 10, and a transmission / reception unit 14 that transmits and receives signals to and from the interphone base unit 2 via the communication line La, A power supply unit 15 that is connected to an external commercial power source (not shown) to obtain its own operating power supply, and a secondary battery 16 that supplies the operating power supply in the event of an abnormality or a power failure of the commercial power supply.

  As shown in FIG. 2, the power measuring apparatus 1 includes voltage lines L1, L2 and a medium line connected from a single-phase three-wire commercial power source through a limiter (not shown) including a current limiter and a main breaker 30. It is connected to the sex wire N (see FIG. 1) via a relay terminal block (not shown). Here, the limiter is a breaker provided to limit the load current of the customer to a contract value or less with the electric power company. Between the main breaker 30 and the relay terminal block, a plurality of branch circuits are connected between the voltage line L1 and the neutral line N and between the voltage line L2 and the neutral line N via branch breakers (not shown). It is connected. That is, power is supplied to each load 5 via the branch breaker. The limiter, main breaker 30, branch breaker, and relay terminal block are housed in the distribution board 3. In the present embodiment, the power measuring device 1 is installed outside the distribution board 3, but the power measuring device 1 may be installed inside the distribution board 3.

  In the distribution board 3, a current sensor 31 including two current transformers CT1 and CT2 for detecting currents flowing through the voltage lines L1 and L2 is provided between the limiter and the main breaker 30 (see FIG. 1). . Here, the current detected by the current transformers CT1 and CT2 is input to the arithmetic unit 10 as a current signal via a current processing circuit (not shown) that performs gain switching and bias application, and the line voltage is a voltage line. A voltage signal is input to the arithmetic unit 10 through a voltage processing circuit (not shown) connected to L1, L2 and the neutral line N and performing differential amplification, phase shift adjustment, and bias application. Therefore, the current sensor 31, the current processing circuit, and the voltage processing circuit correspond to the measuring unit.

  The arithmetic unit 10 calculates the instantaneous current values detected by the current transformers CT1 and CT2, and the instantaneous voltage values of the line voltages between the voltage line L1 and the neutral line N and between the voltage line L2 and the neutral line N, respectively. Product and add and average both products. And the said calculation process is performed for every sampling time, and the value which averaged these process results for every fixed period is calculated as an instantaneous electric power value. Based on the instantaneous power value and the output of the time measuring unit 12, the calculation unit 10 obtains the integrated power amount supplied to the load during the specified period. In this embodiment, one day and one month are adopted as the specified period. In other words, the calculation unit 10 calculates the integrated power amount per day and the integrated power amount per month. Of course, the specified period need not be limited to the above-mentioned period, and for example, the integrated power amount in units of one hour may be calculated.

  The control unit 11 associates the accumulated electric energy obtained by the calculation unit 10 with the date and time measured by the time measuring unit 12 and stores them in the storage unit 13 as a history, and the period from the storage to the present is a predetermined period ( The history exceeding the storage period) is deleted from the storage unit 13. The storage unit 13 also includes a first storage unit 13a that stores a history of integrated power consumption in units of one day for each unit, and a second storage unit that stores history of integrated power amounts in a unit of one month for each unit. 13b, and the history storage period in the second storage unit 13b is set longer than the history storage period in the first storage unit 13a.

  The power supply unit 15 obtains an operating power source for the power measuring device 1 from the line voltage between the voltage lines L1, L2 and the neutral line N, and the operating power source is supplied from the power source unit 15 to each unit of the power measuring device 1. . In addition, the secondary battery 16 operates as a backup power source for the power supply unit 15 at the time of abnormality or a power failure of the commercial power supply, and supplies operating power to the timer unit 12 and the storage unit 13 at the time of abnormality or power failure.

  As shown in FIG. 1, the intercom base unit 2 includes a control unit 20 that controls the whole, a microphone (not shown) for inputting sound, and a speaker (not shown) for outputting sound. And a base unit communication unit 21 that detects a call signal transmitted from the doorphone sub unit 4 (see FIG. 2) via the communication line Lb and forms a communication path with the door phone sub unit 4, and a liquid crystal display, for example. And a display unit 22 for displaying a pictographic mark for notifying the invasion of a suspicious person or an image captured by a camera (not shown) of the door phone sub unit 4 and one or more push buttons exposed on the surface of the unit Communication between the operation input receiving unit 23 that transmits an operation signal corresponding to each button to the control unit 20, the time measuring unit 24 that measures the current date and time, and the power measuring device 1. Send signal via line La A transceiver 25 for performing signal, and a power supply unit 26 for being connected to an external commercial power source to obtain the operating power supply of its own. The operation input receiving unit 23 is provided with a power monitor button for instructing to display an outline of the integrated power amount on the display unit 22 when pressed. Since the doorphone sub unit 4 is well known in the art, a detailed description thereof is omitted here.

  Hereinafter, communication between the power measurement device 1 and the intercom base unit 2 in the present embodiment will be described. First, when the power monitor button is pressed in the operation input receiving unit 23 of the interphone master unit 2, the control unit 20 receives a request signal from the signal transmission / reception unit 25 to request transmission of a history of the accumulated power amount of the load 5. Transmit to the measuring device 1. When the signal transmission / reception unit 14 receives the request signal, the control unit 11 of the power measuring device 1 reads the accumulated power amount history from the storage unit 13 and sends a response signal including the history from the signal transmission / reception unit 14 to the interphone master unit 2. Send it. When the signal transmission / reception unit 25 receives the response signal, the control unit 20 of the intercom base unit 2 performs statistical processing on the history of the integrated power amount included in the response signal. Then, the statistical processing result is subjected to image processing and output to the display unit 22. For example, in this embodiment, the integrated power amount on the date when the power monitor button is pressed is displayed. The outline of the integrated power amount displayed on the display unit 22 is not necessarily limited to the above. For example, the integrated power amount for the week or month when the power monitor button is pressed or the year may be displayed. Absent. After confirming the integrated power amount, the power monitor button is pressed again to turn off the display and shift to a standby state.

  Next, main operations in the power measuring apparatus 1 of the present embodiment will be described with reference to FIG. The computing unit 10 computes an instantaneous power value for each fixed period based on the instantaneous current value and the instantaneous voltage value measured by the measuring means such as the current sensor 31 as described above. Thereafter, the control unit 11 confirms the current date and time via the time measuring unit 12 and determines whether or not one day has elapsed, that is, determines whether or not the instantaneous power value has been accumulated for one day. When it is determined that one day has elapsed, the calculation unit 10 integrates these instantaneous power values and calculates an integrated power amount in units of one day. Here, the control unit 11 confirms the storage period of the oldest history of the accumulated power amount in units of one day stored in the first storage unit 13a, and the storage period is set in advance (for example, , Several months). If it has exceeded, the control unit 11 deletes the oldest history of the integrated power amount in one day unit from the first storage unit 13a and calculates the integrated power amount in the one day unit obtained previously. The date is stored in the first storage unit 13a as the latest history in association with the date.

  Next, the control unit 11 determines whether or not one month has passed, that is, determines whether or not the accumulated power amount for one day has been accumulated for one month. When it is determined that one month has passed, the arithmetic unit 10 integrates the integrated power amounts in units of one day to calculate the integrated power amount in units of one month. Here, the control unit 11 confirms the storage period of the oldest history of the accumulated electric energy in January stored in the second storage unit 13b, and the storage period is set to a storage period (for example, , Several years). If it has exceeded, the control unit 11 deletes the oldest history of the integrated power amount in January unit from the second storage unit 13b and calculates the integrated power amount in January unit obtained previously. The date is stored in the second storage unit 13b as the latest history in association with the date.

  As described above, the storage unit 13 is provided in the power measuring device 1 that is not restricted in shape and dimensions as compared with the interphone base unit 2, thereby providing the storage unit 13 with the storage capacity of the storage unit 13. Compared to the case, it can be increased, and the history of the integrated electric energy supplied to the load 5 can be stored for a long period of time. In addition, since the history of the integrated power amount of the monthly load 5 is stored and held longer than the history of the integrated power amount of the daily load 5, the history of the integrated power amount of the monthly load 5 is given priority. Can memorize for a long time. Therefore, as described in the above problem, for example, it is possible to compare the integrated electric energy of the load 5 such as comparing the integrated electric energy of the load 5 in an arbitrary month over the past several years.

DESCRIPTION OF SYMBOLS 1 Electric power measurement apparatus 10 Calculation part (calculation means)
11 Control unit (control means)
12 Timekeeping section (timekeeping means)
13 Storage unit (storage means)
13a 1st memory | storage part (1st memory | storage means)
13b 2nd memory | storage part (2nd memory | storage means)
2 Interphone main unit 31 Current sensor (measuring means)

Claims (1)

  A power measuring device that monitors the power supplied to the dwelling unit, measures the current and voltage in the distribution board that branches and supplies to the branch circuit connected to the load, and calculates the amount of power supplied to the load, and the dwelling unit The interphone main unit is installed, and the information on the amount of power supplied to the load calculated by the power measuring device is transmitted to the interphone main unit and supplied to the load based on the information received by the interphone main unit. A power monitoring system for notifying a resident of an amount of electric power, wherein the power measuring device includes a measuring means for measuring a voltage and a current supplied to a load via a power line, an instantaneous voltage value and an instantaneous value measured by the measuring means. Calculation means for obtaining the integrated electric energy supplied to the load during the specified period using the current value, storage means for storing the integrated electric energy supplied to the load obtained by the calculation means, current date and time The timekeeping means for measuring the time, the accumulated electric energy obtained by the computing means and the date and time measured by the timekeeping means are associated with each other and stored in the storage means as a history, and the period from the storage to the present exceeds the predetermined period Control means for deleting the history from the storage means, and the storage means stores a history of the integrated power consumption in units of one day for each unit and a history of the integrated power amount in units of one month. And a second storage means for storing each unit, wherein the second storage means has a longer period for storing and holding the history than the first storage means.

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