JP5220775B2 - Power measuring apparatus and power measuring system - Google Patents

Power measuring apparatus and power measuring system Download PDF

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JP5220775B2
JP5220775B2 JP2010000184A JP2010000184A JP5220775B2 JP 5220775 B2 JP5220775 B2 JP 5220775B2 JP 2010000184 A JP2010000184 A JP 2010000184A JP 2010000184 A JP2010000184 A JP 2010000184A JP 5220775 B2 JP5220775 B2 JP 5220775B2
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power
device
measurement
circuit
wireless communication
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JP2011137782A (en
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正裕 石原
正明 矢部
直之 樋原
利康 樋熊
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三菱電機株式会社
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/20Systems integrating technologies related to power network operation and communication or information technologies mediating in the improvement of the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as enabling technology in buildings sector
    • Y02B90/26Communication technology specific aspects
    • Y02B90/2607Communication technology specific aspects characterised by data transport means between the monitoring, controlling or managing units and the monitored, controlled or operated electrical equipment
    • Y02B90/2653Communication technology specific aspects characterised by data transport means between the monitoring, controlling or managing units and the monitored, controlled or operated electrical equipment using wireless data transmission
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/10Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by communication technology
    • Y04S40/12Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by communication technology characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/126Using wireless data transmission

Description

  The present invention relates to a power measurement device and a power measurement system that measure power consumption of an electrical device.

  Since the conventional power measuring device is installed on the distribution board, it is possible to measure the overall power consumption, but it is difficult to measure the power consumption of individual electrical devices. In order to measure the power consumption of individual electrical devices, it is necessary to process the periphery of the outlet for power measurement, but such processing is not easy. Thus, an outlet connection type electric quantity monitoring device that measures power consumption of individual electric devices has been proposed (see, for example, Patent Document 1).

  In this electric quantity monitoring device, a CT (Current Transformer) and a PT (Potential Transformer) are provided on an electric path connecting the outlet and the plug of the electric device. The electrical quantity monitoring device includes an arithmetic processing unit, a display unit, and a transmission unit. The arithmetic processing unit calculates harmonic components of current, voltage, power, electric energy, power factor, frequency or current, and voltage based on the CT and PT signals. The display unit displays at least one of the information related to electricity obtained by the calculation. The transmission means transmits the output information of the arithmetic processing unit to an external device by power line carrier communication or serial communication.

  By using this electric quantity monitoring device, it becomes possible to individually measure the measurement data related to the power consumption and other electric power of the electric equipment, and to transmit the measurement data to an external device.

JP 2003-149272 A

  In the electricity quantity monitoring device described in Patent Document 1, if the number of plugs connected to an outlet is increased, the power of a plurality of electrical devices can be individually measured with one power measuring device. However, in general, the outlets to which electrical devices are connected are distributed in each room, and the electrical devices are also installed in a distributed manner. A plurality of electric quantity monitoring devices are required.

  If you install multiple electricity monitoring devices to measure the power of multiple electrical devices, you can measure the power consumption of each electrical device individually, but it is difficult to centrally manage the results of measuring the power consumption of multiple electrical devices. Become.

  In addition, the electric quantity monitoring device of Patent Document 1 is provided with a display unit. When the display unit is provided, it is necessary to provide the electric quantity monitoring device with PT and an insulated power source, so that the whole device becomes large and expensive. If the entire device becomes large and expensive, it becomes difficult to install a plurality of electricity quantity monitoring devices.

  If the means for transmitting the measurement result to an external device is wired, it is necessary to separately wire a communication cable for measurement data, and it is difficult to move the apparatus. If power line carrier communication is used, a new cable becomes unnecessary, but at present, it is difficult to improve communication quality.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a power measurement device and a power measurement system that are compact and low-cost, highly convenient, and suitable for installation in a large number.

In order to achieve the above object, in the power measuring apparatus according to the present invention, the plug is connected to an outlet. The outlet is connected to the electrical device to be measured. The power line connects the plug and the outlet. The voltage measurement circuit measures a voltage applied via the power line. The current measurement circuit measures a current flowing through the power line. The A / D converter performs A / D conversion on the voltage value measured by the voltage measurement circuit and the current value measured by the current measurement circuit. The computing unit computes information related to the power consumption of the electric device based on the voltage value and the current value subjected to A / D conversion by the A / D conversion unit. The wireless communication unit transmits information regarding the power consumption of the electric device calculated by the calculation unit to the external device by wireless communication. The power supply circuit supplies power to the A / D conversion unit, the calculation unit, and the wireless communication unit. The power supply circuit is configured by a non-insulated circuit, and the voltage measurement circuit is configured by a resistance voltage dividing circuit. The computing unit detects information related to the state of the electrical device based on information related to the power consumption of the electrical device. The wireless communication unit transmits information regarding the state of the electrical device to the external device.

  According to the present invention, since the measurement data is transmitted to the outside by the wireless communication unit, when a plurality of units are installed, the measurement data can be collected and easily managed, so that convenience can be improved. In addition, since the measurement data is transmitted to the outside by the wireless communication unit, there is no need to provide a display unit for displaying the measurement data. In addition, since the main body does not have an interface that requires insulation, a non-insulated power circuit can be used for the power circuit, and a resistance voltage dividing circuit can be used for the voltage measurement circuit. Since both the non-insulated power supply circuit and the resistance voltage dividing circuit have simple circuit configurations, the entire device can be reduced in size and cost. As a result, a large number of units can be installed.

It is a block diagram which shows the structure of the electric power measurement system which concerns on Embodiment 1 of this invention. It is a schematic diagram when a plurality of power measuring devices are installed. It is a block diagram which shows the structure of the electric power measurement system which concerns on Embodiment 2 of this invention. It is a block diagram which shows the structure of the electric power measurement system which concerns on Embodiment 3 of this invention.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

Embodiment 1 FIG.
First, a first embodiment of the present invention will be described.

  As shown in FIG. 1, the power measurement system 100 according to the first embodiment includes a power measurement device 1 and a power display server 2. The power measuring device 1 measures the power consumption of the electric device 4. The power display server 2 receives and displays the measurement data of the power measuring device 1. In some cases, a plurality of power measuring devices 1 are installed in accordance with the number of electrical devices 4 to be measured.

  First, a detailed configuration of the power measuring device 1 will be described.

  The power measuring device 1 includes a plug 11 and outlets 12a and 12b. The plug 11 is connected to an outlet 3 installed in a house or the like. The plugs 40 of the electrical equipment 4 to be measured are connected to the outlets 12a and 12b.

  The power measuring device 1 further includes two power lines 13. The two power lines 13 connect the plug 11 and the outlets 12a and 12b. The power measuring device 1 further includes a ground terminal 14. One of the power lines 13 is connected to the ground terminal 14.

  The power measuring device 1 further includes a non-insulated power circuit 15. The non-insulated power circuit 15 is connected to the power line 13 input from the plug 11. The non-insulated power supply circuit 15 converts the AC voltage applied from the plug 11 into a DC voltage. As the non-insulated power supply circuit 15, a highly efficient chopper type DC / DC converter is suitable. A chopper type DC / DC converter is a conversion circuit in which an input and an output are not insulated.

  The power measuring device 1 further includes a voltage measuring circuit 16 and a current measuring circuit 17.

  The voltage measurement circuit 16 measures the voltage applied via the power line 13. The voltage measurement circuit 16 is a resistance voltage dividing circuit. The resistance voltage dividing circuit is a circuit that drops an output voltage with respect to an input voltage using a plurality of resistors connected in series.

  This resistance voltage dividing circuit divides the AC power supply voltage input from the plug 11 and supplied through the power line 13 to a level suitable for the analog input of the A / D converter 5. For example, when the analog input range of the A / D conversion unit 5 is ± 500 mV, the resistance voltage dividing circuit divides the voltage so that the peak value of the AC 100 V power supply voltage falls within this range. The voltage measurement circuit 16 is connected to the power supply line 13 that is not connected to the ground terminal 14.

  The current measurement circuit 17 is connected to the current transformers 10a and 10b. Current transformers 10a and 10b are electromagnetically coupled to power supply lines 13 connected to outlets 12a and 12b, respectively. Hereinafter, the current transformers 10a and 10b are also referred to as CTs 10a and 10b. A current proportional to the consumption current of the electric equipment 4 connected to the outlets 12a and 12b flows through the CTs 10a and 10b. This proportionality coefficient is determined by the number of turns of CT10a and 10b.

  The power measuring device 1 further includes an A / D conversion unit 5, a calculation control unit 6, a wireless communication unit 7, and an antenna 8. The DC voltage output from the non-insulated power supply circuit 15 is supplied to the A / D conversion unit 5, the calculation control unit 6, and the wireless communication unit 7.

  The A / D converter 5 has a plurality of A / D converters. For this reason, the A / D converter 5 can simultaneously A / D convert the outputs of the voltage measurement circuit 16 and the current measurement circuit 17.

  The calculation control unit 6 performs a predetermined calculation based on the output of the A / D conversion unit 5 and calculates measurement data related to the power consumption of the electric device 4. Moreover, the arithmetic control part 6 controls the main body of the electric power measurement apparatus 1 as needed based on the acquired measurement data.

  The wireless communication unit 7 is connected to the arithmetic control unit 6 by serial input / output. The wireless communication unit 7 inputs measurement data related to the power consumption of the electric device 4 from the arithmetic control unit 6 via the serial input / output, and transmits the measurement data to the external device via the antenna 8 by wireless communication. . The wireless communication unit 7 is, for example, a ZigBee (registered trademark) module.

  The antenna 8 is connected to the wireless communication unit 7. The antenna 8 transmits and receives radio signals to and from the power display server 2.

  Next, the configuration of the power display server 2 will be described.

  The power display server 2 has an antenna 21 for transmitting and receiving with a radio signal. The power display server 2 incorporates a ZigBee (registered trademark) module in order to perform wireless communication with the power measuring device 1. The power display server 2 receives and displays the measurement data related to the power consumption of the electrical equipment 4 transmitted from the power measurement device 1.

  When a plurality of power measuring devices 1 are installed, the power display server 2 collects and records measurement data of the electrical equipment 4 from each power measuring device 1.

  Next, the operation of the power measurement system 100 according to this embodiment will be described.

  The AC voltage input from the plug 11 is rectified by the non-insulated power supply circuit 15 and converted to a DC voltage. Further, the non-insulated power supply circuit 15 converts the converted DC voltage into operation power supply voltages for the A / D conversion unit 5, the calculation control unit 6, and the wireless communication unit 7. When the operation power supply voltage is supplied from the non-insulated power supply circuit 15, the A / D conversion unit 5, the calculation control unit 6, and the wireless communication unit 7 start operation.

  The voltage measurement circuit 16 divides the AC power supply voltage input via the plug 11 to a level suitable for the analog input of the A / D conversion unit 5. The current measurement circuit 17 converts the outputs of the CTs 10a and 10b to an input level suitable for the analog input range of the A / D converter 5 with an appropriate load resistance.

  The AC power supply voltage scaled by the voltage measurement circuit 16 is input to the analog input terminal of the A / D converter 5 and sampled. The sampling timing of the A / D conversion unit 5 is controlled by a trigger input from the arithmetic control unit 6.

  Similarly, the voltage value proportional to the current consumption of the electrical equipment connected to the outlets 12a and 12b, which is scaled by the current measurement circuit 17, is input to each analog input terminal of the A / D conversion unit 5, and is calculated. Sampling is performed at the same sampling timing as the output of the voltage measurement circuit 16 by a trigger from the controller 6. When canceling the phase advance of the current waveform measured by the CTs 10a and 10b, the sampling timing in the current measurement circuit 17 is earlier than the output timing of the voltage measurement circuit 16 by the amount of phase advance of the current waveform. There is a need to.

  The measurement values of the voltage measurement circuit 16 and the current measurement circuit 17 converted into digital signals by the A / D conversion unit 5 of the power measurement device 1 are input to the arithmetic control unit 6 where measurement data regarding power consumption is calculated. The The calculation of power consumption is performed for each electrical device 4 connected to each of the outlets 12a and 12b.

  The arithmetic control unit 6 multiplies the sample value of the voltage at each time by the sample value of the current of each outlet 12a, 12b at the same time. Subsequently, the arithmetic control unit 6 takes the sum of the multiplication values calculated in this way over one AC voltage cycle. Furthermore, the arithmetic control unit 6 calculates the power consumption for each electrical device 4 by dividing this sum by the number of samples in one cycle. The arithmetic control unit 6 may also calculate the effective value of the voltage and current, the power factor, and the like from the measured values of the current and voltage. Further, the arithmetic control unit 6 may calculate the power consumption amount for each electrical device 4 by integrating the power consumption.

  Measurement data such as power consumption calculated by the arithmetic control unit 6 is output to the wireless communication unit 7 by serial input / output. The measurement data input from the arithmetic control unit 6 is transmitted from the antenna 8 by the wireless communication unit 7 by a communication method compliant with the ZigBee (registered trademark) standard.

  The power display server 2 receives the measurement data transmitted from the power measurement device 1 through the antenna 21. When the measurement data transmitted from the power measurement device 1 cannot be directly received by the power display server 2, a relay ZigBee (registered trademark) transceiver may be interposed therebetween.

  The power display server 2 displays power consumption of each electrical device measured by the power measurement device 1 and measurement data related to power consumption such as power consumption in a format that is easy for the user to understand, such as numerical values or graph display.

<Setting method of power measuring device>
Next, a setting method of the power measuring apparatus 1 according to this embodiment will be described.

  The power display server 2 transmits a setting control command, a setting value of an operation parameter, and the like to the power measuring device 1 via the antenna 21. The setting control command and the setting value of the operation parameter are received by the antenna 8 of the power measuring apparatus 1 and transmitted from the wireless communication unit 7 to the arithmetic control unit 6 by serial input / output. The arithmetic control unit 6 that has received the setting control command and the operating parameter setting value changes the setting of the power measuring apparatus 1 based on the setting control command and the received operating parameter setting value.

  The control command and the operation parameter are written in a nonvolatile memory such as a flash memory included in the arithmetic control unit 6. The setting parameters of the power measuring device 1 include a history data storage capacity of the power measuring device 1, an event detection mode valid / invalid setting, an address, a communication speed, a data format, and the like.

  As described above in detail, according to this embodiment, since the measurement data is transmitted to the outside by the wireless communication unit 7, measurement is performed from each power measurement device 1 when a plurality of power measurement devices 1 are installed. Convenience can be improved because it is easier to collect and centrally manage data.

  Moreover, since the electric power measurement apparatus 1 transmits measurement data to the exterior by the wireless communication part 7, it is not necessary to provide the display part which displays measurement data. Further, since the main body does not have an interface that requires insulation, the non-insulated power supply circuit 15 can be used as the power supply circuit, and the resistance voltage dividing circuit can be used as the voltage measurement circuit 16. Since the non-insulated power supply circuit 15 and the voltage measurement circuit 16 are both simple and inexpensive in circuit configuration, the entire power measurement device 1 can be reduced in size and cost.

  Moreover, according to this embodiment, since the power consumption measurement data is displayed on the power display server 2, it is not necessary to provide an operation panel or the like that requires insulation in the main body of the power measurement device 1. For this reason, the power measuring device 1 can be further reduced in size and cost.

  As a result, it is easy to install a large number of power measuring devices 1 by reducing the size and cost of the power measuring device 1.

  For example, as shown in FIG. 2, even when a plurality of power measuring devices 1 are installed, all measurement data of each power measuring device 1 is transmitted to the power display server 2. In this way, by transmitting measurement data such as power consumption to the power display server 2 by wireless communication, the power display server 2 can centrally manage the power consumption of all the electrical devices 4.

  Moreover, since the power display server 2 collects measurement data of each electrical device 4 by wireless communication, no new cable wiring is required. Moreover, since the power measuring device 1 and the power display server 2 are connected by wireless communication, the power measuring device 1 and the electric device 4 to be measured can be easily transferred. Furthermore, since wireless communication nodes can be appropriately arranged, communication quality can be easily improved.

  In addition, by reducing the size and cost of the power measuring device 1 and making it possible to easily construct a network, the power measuring device can measure a plurality of outlets and a plurality of electrical devices 4 that are distributed. 1 is easy to install.

  Furthermore, by making it possible to monitor the power consumption of each electrical device 4 individually, the user can grasp how much power the electrical device 4 is consuming, thereby improving the user's awareness of energy saving. be able to. As a result, more detailed energy management and operation is possible, so that power consumption can be reduced.

  It should be noted that a component with a high input impedance such as an operational amplifier may be inserted on the output side of the resistance voltage dividing circuit of the voltage measuring circuit 16 in order to prevent a change in the voltage dividing ratio due to impedance variations and fluctuations in the subsequent circuit. Good. Further, the current measurement circuit 17 may be provided with an amplifier circuit such as an operational amplifier or a voltage dividing circuit in order to further adjust the input level.

  In this embodiment, CTs 10a and 10b are used as means for detecting current. However, shunt resistors may be used as means for measuring current. In general, since the CTs 10a and 10b are large, the power measuring device 1 can be further downsized by using a shunt resistor. However, it should be noted that when a shunt resistor is used, it is necessary to insert a high CMRR (common-mode rejection ratio) differential amplifier into the current measurement circuit 17.

  Further, in the power measuring apparatus 1, a magnetic field sensor may be adopted as means for detecting current. Even if it does in this way, the same effect can be acquired. However, since the magnetic field sensor is expensive, it is desirable to use a CT 10a, 10b or a shunt resistor as in this embodiment.

  In this embodiment, the number of outlets provided in the power measuring apparatus 1 is two. However, the number of outlets in the power measuring apparatus 1 may be one, or three or more. Also good.

  In this embodiment, the wireless communication unit 7 is a ZigBee (registered trademark) module. However, other short-distance wireless communication wireless modules such as a wireless LAN, Bluetooth (registered trademark), and specific low-power wireless communication are used. You may make it employ | adopt. Here, the specific low-power radio is a radio that does not require a license, and is a short-distance radio with an antenna power of 10 mW or less.

  However, it is most preferable to use a ZigBee (registered trademark) module because of low power consumption, low cost, and easy relay of wireless data.

In addition, if the power display server 2 can display not only power consumption and power consumption but also various data such as electricity charges corresponding to the power consumption, CO 2 emission amount, crude oil amount, etc. It is possible to effectively raise the user's energy saving awareness.

  The power measuring device 1 can also be used for detecting an abnormality in the electrical equipment 4 connected to the outlets 12a and 12b. First, a current threshold value for determining an abnormal state of the electric device 4 is set in the arithmetic control unit 6. The arithmetic control unit 6 determines whether or not the current measurement value of the power measurement device 1 has exceeded a threshold value. If the current measurement value of the power measurement device 1 exceeds the threshold value, the electric device 4 has a failure or tracking. It may be determined that the abnormality has occurred, and the power display server 2 may be notified of the abnormal state.

  Further, an alarm buzzer for notifying the abnormality of the electric device 4 may be installed in the power measuring device 1. In this way, the user can quickly cope with the abnormality of the electric device 4.

  In addition, a power threshold value for determining whether the electric device 4 is turned on / off or in use / standby state is set in the arithmetic control unit 6, and a power measuring device is displayed on the presence display of the user who uses the electric device 4 1 may be used. For example, when the power measuring device 1 is used in an office or factory, the personal computer (PC) of each person's desk is connected to the outlet 12 of the power measuring device 1 in the office or factory, and the use state / standby of the PC A threshold for determining the state / power-off state is set in the arithmetic control unit 6. The arithmetic control unit 6 compares the measured value of current consumption with each threshold value, detects the current PC state, and transmits it to the power display server 2. The power display server 2 displays the received PC status. If this display is seen, the administrator can confirm the presence / absence / return home of the user who uses the PC.

  Moreover, you may make it install the electric power measuring apparatus 1 in the place where it is difficult to confirm a user's safety, such as the home of the elderly who live alone, and the test equipment which may be used independently. In this case, the user's safety can be confirmed by accessing the power display server 2 and viewing the usage state of the electric device 4 used by the user.

  Further, if the power measuring device 1 is used, the power consumption of each electric device 4 becomes clear, and thus the user can be charged individually for the electric charge of each electric device 4.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described.

  FIG. 3 shows the configuration of the power measurement system 100 according to the second embodiment. In the power measurement system 100, the power measurement device 1 has a function of cutting off the supply of power to the electrical device 4.

  As shown in FIG. 3, the power measurement system 100 is the same as the first embodiment in that the power measurement system 100 includes a power measurement device 1 and a power display server 2. Further, the point that a plurality of power measuring devices 1 can be installed according to the number of electrical devices 4 to be measured is the same as in the first embodiment.

  The power measuring device 1 is connected to the outlet 3 by the plug 11, and the plug 40 of the electric device 4 is also connected to the outlets 12a and 12b, respectively, as in the first embodiment.

  Switches 18a and 18b are connected to the outlets 12a and 12b, respectively. The switches 18a and 18b are configured by components such as relays. The switches 18a and 18b are closed in the normal state, and when the switches 18a and 18b are closed, the outlets 12a and 12b are electrically connected.

  The switches 18 a and 18 b are on / off controlled by the arithmetic control unit 6.

  In the arithmetic control unit 6, the upper limit value of the current flowing through the outlets 12a and 12b is set as one of the operation parameters. The upper limit value of the current can be individually set for each electrical device 4 connected to the outlet 12a and the outlet 12b.

  The arithmetic control unit 6 compares the measured current value and the upper limit value of each of the electric devices 4 connected to the outlets 12a and 12b, and when the measured current value exceeds the upper limit value, the switch 18a and 18b are shut off, that is, opened. Put it in a state.

  Next, the operation when the switches 18a and 18b are opened and closed will be described.

  Control commands for opening and closing the switches 18 a and 18 b are transmitted from the power display server 2 via the antenna 13. Control commands for opening and closing the switches 18 a and 18 b are transmitted to the arithmetic control unit 6 by serial input / output via the antenna 8 and the wireless communication unit 7 in the power measuring device 1. The arithmetic control unit 6 that has received the control command can also control the opening and closing of the switches 18a and 18b based on the control command.

  Other operations are the same as those in the first embodiment.

  As described above in detail, according to this embodiment, the arithmetic control unit 6 controls the opening and closing of the switches 18a and 18b based on the current value, so that an overcurrent is generated due to a failure or tracking of the electrical device 4. Even in this case, the switches 18a and 18b can be quickly shut off, so that safety can be improved.

  In addition, since the switches 18a and 18b can be opened and closed by a command from the power measurement server 2, the power source of the electric device 4 can be shut off by remote operation. In this way, the power supply to the unused electrical device 4 can be stopped without removing the outlets 12a and 12b, so that the power consumption can be reduced.

  In the second embodiment, timer management may be performed by the current display server 2, and the switches 18a and 18b may be shut off at a fixed time zone. Further, the switches 18a and 18b may be shut off at a fixed time period by the timer management of the arithmetic control unit 6 of the power measuring device 1. For example, by controlling the switches 18a and 18b to be cut off at night, standby power can be cut off and energy saving can be realized.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described.

  In each of the first and second embodiments, the power display server 2 has a built-in wireless communication module to directly perform wireless communication with the power measuring apparatus 1. However, in this embodiment, an aggregation device that aggregates the measurement data of the power measurement device 1 is provided and used in combination with the power measurement device installed on the distribution board.

  As shown in FIG. 4, the power measurement system 100 according to this embodiment includes a power measurement device 30 and a measurement data aggregation device 31 in addition to the power measurement device 1 and the power display server 2.

  In the distribution board 32, a breaker 34 is connected to a three-phase power line 33. The power measuring device 30 is installed in the distribution board 32 separately from the power measuring device 1. The power measuring device 30 is connected to the power line 33 in the distribution board 32 and is electromagnetically coupled to the power line 33 via the CTs 19a and 19b.

  The power measuring device 30 detects the voltage applied to the power line 33 and the current flowing through the power line 33, and the total power consumption of one system cut off by the breaker 34 (that is, the power consumption supplied via the power line 33). ). The power measurement device 30 is connected to the measurement data aggregation device 31 with an RS-485 cable 35. The power measurement device 30 transmits measurement data of power consumption of the entire system to the measurement data aggregation device 31 via the RS-485 cable 35.

  The plug 11 of the power measuring device 1 is inserted into the outlet 3 connected to the power line 33, and the electric device 4 is connected to each of the outlets 12a and 12b. The power measuring device 1 measures the measurement data of the power consumption of the individual electric devices 4 connected to the outlets 12a and 12b, respectively. This measurement data is transmitted to the measurement data aggregating apparatus 31 via the antenna 8 by wireless communication. The measurement data aggregation device 31 includes an antenna 21 that receives a radio signal. The measurement data aggregation device 31 receives the measurement data of the power measurement device 1 through the antenna 21.

  The measurement data aggregation device 31 collects measurement data from the power measurement device 1 and the power measurement device 30. The measurement data aggregation device 31 is connected to the power display server 2 by a LAN cable 36. When the measurement data aggregation device 31 receives the respective measurement data from the power measurement device 1 and the power measurement device 30, the measurement data aggregation device 31 aggregates the received measurement data and transmits it to the power display server 2 via the LAN cable 36.

  When receiving each measurement data from the measurement data aggregation device 31, the power display server 2 calculates the total power consumption of the system of the breaker 34 and the power consumption of each electric device 4 with respect to the total power consumption based on each measurement data, The ratio is digitized or graphed, and displayed in a format that is easy for the user to understand.

  As described above in detail, according to this embodiment, the power consumption of each electric device 4 with respect to the total power consumption of the system is obtained by using it in combination with the power measuring device 30 installed on the existing distribution board 32. The percentage of power can be determined. From this ratio, it is possible to determine the electric equipment 4 that accounts for a large proportion of power consumption. For example, by considering measures such as reducing the power consumption of the electrical crisis 4, more detailed energy management and operation Is possible.

  The present invention is suitable for measuring power consumption of electrical equipment.

DESCRIPTION OF SYMBOLS 1 Power measuring device 2 Power display server 3 Outlet 4 Electric equipment 5 A / D conversion part 6 Operation control part 7 Wireless communication part 8 Antenna 10a, 10b Current transformer (CT)
11 Plug 12a, 12b Outlet 13 Power line 14 Ground terminal 15 Non-insulated power circuit 16 Voltage measurement circuit 17 Current measurement circuit 18a, 18b Switch 19a, 19b Current transformer (CT)
DESCRIPTION OF SYMBOLS 21 Antenna 30 Electric power measurement apparatus 31 Measurement data collection apparatus 32 Distribution board 33 Power line 34 Breaker 35 RS-485 cable 36 LAN cable 40 Plug 100 Electric power measurement system

Claims (11)

  1. A plug connected to the outlet,
    The outlet connected to the electrical device to be measured;
    A power line connecting the plug and the outlet;
    A voltage measuring circuit for measuring a voltage applied via the power line;
    A current measurement circuit for measuring a current flowing through the power line;
    An A / D converter for A / D converting the voltage value measured by the voltage measurement circuit and the current value measured by the current measurement circuit;
    A calculation unit that calculates information on power consumption of the electrical device based on the voltage value and the current value that are A / D converted by the A / D conversion unit;
    Information regarding power consumption of the electric device calculated by the calculation unit, a wireless communication unit that transmits the information to an external device by wireless communication;
    A power supply circuit that supplies power to the A / D conversion unit, the calculation unit, and the wireless communication unit;
    With
    The power supply circuit is composed of a non-insulated circuit,
    The voltage measuring circuit is constituted by a resistive voltage divider circuit,
    The computing unit is
    Based on the information on the power consumption of the electrical device, detects information on the state of the electrical device,
    The wireless communication unit
    Transmitting information on the state of the electrical device to an external device;
    A power measuring device characterized by that.
  2. The computing unit is
    According to the setting value of the parameter received by the wireless communication unit, to calculate the measurement data of the power consumption of the electrical equipment,
    The power measuring device according to claim 1.
  3. A switch for opening and closing between the plug and the outlet;
    A control unit for controlling opening and closing of the switch;
    The power measuring device according to claim 1, further comprising:
  4. The controller is
    When the current value measured by the current measurement circuit exceeds a threshold value, the switch is controlled to be opened.
    The power measuring device according to claim 3.
  5. The controller is
    Open / close control of the switch based on the open / close command received via the wireless communication unit,
    The power measuring device according to claim 3 or 4, wherein
  6. With a timer
    The controller is
    The timer controls the switch to be open in a predetermined time zone.
    The power measuring device according to any one of claims 3 to 5, wherein
  7. The current measuring circuit is
    It is composed of any of current transformer, shunt resistor and magnetic field sensor,
    The power measuring device according to claim 1, wherein the power measuring device is a power measuring device.
  8. The wireless communication unit
    Transmitting the measurement data to the external device by short-range wireless communication;
    The power measurement device according to claim 1, wherein the power measurement device is a power measurement device.
  9. The power measuring device according to any one of claims 1 to 8 ,
    A power display server for displaying measurement data of the electrical equipment transmitted from the power measurement device;
    A power measurement system comprising:
  10. A plurality of the power measuring devices are provided,
    From each of the power measurement devices, further comprising an aggregation device that aggregates the measurement data of the electrical equipment,
    The power measurement system according to claim 9 .
  11. Other power measurement devices that measure the power consumption of the entire system,
    Based on the measurement data aggregated from the power measurement device aggregated by the aggregation device, a calculation device that calculates the ratio of the power consumption of the electrical equipment to the power consumption of the entire system,
    Further comprising
    The power display server is
    Display the percentage,
    Power measuring system according to claim 1 0, characterized in that.
JP2010000184A 2010-01-04 2010-01-04 Power measuring apparatus and power measuring system Active JP5220775B2 (en)

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