JP2002296299A - Power monitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a charge set finely, and to make the charge setting change easily. SOLUTION: This motor is provided with a power measuring instrument 12 for measuring momentary electric power based on a voltage value and a current value from an power detecting sensor means 15, and for integrating the momentary power continuously to compute and record an integrated power value, and a power monitoring operation part 17 connected to the power measuring instrument 12 to compute electric energy in every unit time based on the integrated power value read out from the power measuring instrument 12. The monitoring operation part 17 computes electric charges using the charge set value and the electric energy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power monitoring device installed in a general home or the like for monitoring the amount of electric power used or the amount of photovoltaic power generated in the home.

[0002]

2. Description of the Related Art As a device for measuring an integrated power value with a sensor or the like and displaying the result, a device disclosed in Japanese Patent Application Laid-Open No.
No. 86 is known. In the device described in this publication, an instantaneous power is calculated by an arithmetic circuit based on a voltage value and a current value from a sensor attached to a power line, and the integration and storage of the instantaneous power are performed by a control circuit.

[0003]

However, in the apparatus disclosed in the above-mentioned publication, the calculation of the power rate is performed by using the determined price setting value, and when the rate system is changed, Setting change was difficult.

It is an object of the present invention to solve the above-mentioned problems and to provide a power monitoring device capable of finely setting a fee and easily changing the fee setting.

[0005]

In order to solve the above problems, according to the first aspect of the present invention, the instantaneous power is measured based on the voltage value and the current value from the power detection sensor means, and the instantaneous power is measured. A power meter for continuously integrating and calculating and recording an integrated power value, connected to the power meter by a communication line,
From the integrated power value read from the power meter, a power monitor calculation unit that calculates the amount of power per unit time,
The power monitor calculation unit is characterized by a power monitor device capable of calculating a power rate using a rate setting value and the power amount.

According to the first aspect of the present invention, the electricity rate can be easily monitored through the power monitor calculation unit.

[0007] The invention according to claim 2 is characterized by the power monitoring device according to claim 1, wherein the charge set value can be set for each time zone.

According to the second aspect of the present invention, the charge set value can be finely set for each time zone, and a more accurate electricity charge can be obtained through the power monitor calculation unit. it can.

[0009] In the invention described in claim 3, the power monitor calculation unit is capable of changing the charge set value and recalculating the electricity charge with the change of the charge set value. 2 is characterized by the power monitoring device.

According to the third aspect of the present invention, even if the charge is changed, the charge set value can be changed to easily cope with the change. Also, by changing the charge set value, it is possible to perform a simulation to find an optimal charge set value.

[0011]

First Embodiment A first embodiment of the present invention will be described below with reference to the drawings.

1 to 12 show a first embodiment of the present invention.
It is shown.

First, the configuration will be described. As shown in FIG. 1, a distribution board 1 is arranged in a house. The distribution board 1 is provided with a single-phase three-wire main trunk line 2 composed of L1, N, and L2. An earth leakage breaker 3 and an earth leakage breaker 4 are attached to both ends of the main trunk line 2, respectively. A commercial power supply 6 is connected to one of the earth leakage breakers 3 via a watt-hour meter (not shown). In addition, a private power generator 9 including a power conditioner 7 and a solar cell 8 is connected to the other earth leakage breaker 4 side. The power conditioner 7 has an inverter function of converting a DC output of the solar cell 8 into an AC output. Thereby, the system link between the commercial power supply 6 and the private power generator 9 is achieved. Here, the amount of power generated by the private power generator 9 is A, the amount of power purchased from the commercial power source 6 is B (the sign is −), the amount of power sold to the commercial power source 6 is C (the sign is +),
Assuming that the power consumption at home is D, the power consumption D is
D = | (BorC) −A |.

A single-phase three-branch branch trunk 10 is branched from a middle part of the main trunk 2. This branch trunk line 10
Although not shown in the figure, the branch line is branched into a large number of single-phase two-line branch trunks. The single-phase two-branch trunk line extends from the distribution board 1 to each room, and an outlet (terminal connector) is provided at an end thereof.

In the distribution board 1, there is provided a power measuring device 12 capable of measuring the power between the branch point 11 of the branch trunk 10 in the main trunk 2 and the earth leakage breaker 3 on the commercial power supply 6 side. ing. The power measuring device 12 includes a current sensor 13 for detecting a current of the main trunk 2 near the earth leakage breaker 3 and a voltage measuring system 14 for extracting a voltage of the main trunk 2 near the earth leakage breaker 3. Means 15 are provided.

On the other hand, an electric power meter 1
2 is provided with a power monitor operation unit 17 which can be connected via a communication line 16 such as a digital type. The power monitor calculation unit 17 and the power meter 12 constitute a power monitor device 18 according to the present invention. Here, the power monitor calculation unit 17 and the power measuring device 12 have connectors, and are detachably attached to the communication line 16 by this.

The power monitor calculation unit 17 can be connected to an external terminal 25 such as a personal computer, an Internet terminal, or an STB (set top box) as a power monitor display device via a network such as the Internet or a home network. ing. And the external terminal 25
Thereby, the power monitor calculation unit 17 and the power measuring device 12 can be operated, information can be exchanged, and the like.

The power monitor calculation unit 17 may be directly connected to the Internet via the cable modem 26 and the CATV line 27, for example. Alternatively, it may be possible to indirectly connect to the Internet via the home network device 28 and the general public line 29. Note that C
The ATV line 27 and the general public line 29 may be selected alternatively.

The home network device 28 includes a main circuit 30 connected to a general public line 29 and a hub 32 capable of distributing the line to an information outlet 31 in each room. In order to connect the external terminal 25 serving as a monitor display device to the power monitor calculation unit 17 using the home network, the external terminal 25 may be connected to the information outlet 31.

As shown in FIG. 2, the power monitor calculation unit 17 includes an interface circuit unit 33,
A DHCP NAT unit 34 and a main unit 35 are provided.

The interface circuit unit 33 includes the RS 23
Various interfaces such as a 2C port 36, an ISDN S / T point 37, and an Ethernet 10BASE-T port 38 are provided. The RS232C port 36 is used to connect to the main circuit 30 of the home network device 28 via the modem 39 when connecting to the Internet via the general public line 29. ISDN S /
The T point 37 is used to connect to the main circuit 30 of the home network device 28 when connecting to the Internet via the general public line 29. Note that RS232C
The port 36 and the ISDN S / T point 37 may be selected alternatively. Also, 10BASE-T port 38 is
It is used when connecting to the Internet via the ATV line 27.

The DHCP NAT unit 34 has an interface such as a 10BASE-T port 40 for connecting the power monitor operation unit 17 to the hub 32 of the home network device 28. Also, the DHCP NAT unit 3
Reference numeral 4 has a function of performing time sharing of a line connected to the interface circuit unit 33 and the like, assignment of a local address, and the like.

On the other hand, as shown in FIG. 3, the power measuring device 12 constituting the power monitoring device 18 of the present invention internally measures instantaneous power based on a voltage value and a current value from the power detecting sensor 15. A calculation unit 45 for continuously integrating the instantaneous power to calculate an integrated power value; an instantaneous power memory 46 for storing the instantaneous power; and an integrated power for storing the integrated power value from power-on to the present. Memory 4
7, a transmission memory unit 51 including a transmission instantaneous power memory 49 and a transmission integrated power memory 50, and a communication port 52 such as RS485, which can be connected to the communication line 16. It has been. The power meter 12 is configured to be able to rewrite the integrated power value recorded in the internal memory unit 48 to an arbitrary value by using the communication line 16.

As shown in FIG. 4, the power conditioner 7 also has an instantaneous power memory 56 for storing the instantaneous power and an integrated power supply from the time of power-on to the present, as shown in FIG. An internal memory unit 58 including an integrated power memory 57 for storing power values, a transmission memory unit 61 including a transmission instantaneous power memory 59 and a transmission integrated power memory 60, and a communication port 62 such as RS485. And can be connected to the communication line 16. The power conditioner 7 may be configured such that the integrated power value recorded in the internal memory unit 58 can be rewritten to an arbitrary value using the communication line 16 similarly to the power measuring device 12. The communication line 16 to the power measuring device 12 and the power conditioner 7 is not limited to the RS485 system.
LAN method such as RS232C method and Ethernet,
Others are also good.

As shown in FIG. 5, the main unit 35 of the power monitor calculation unit 17 includes a sensor input / output unit 65.
A calculation unit 66 for performing various calculations using data input / output from the sensor input / output unit 65;
A memory unit 67 for storing data input / output from / to, operation result data calculated by the operation unit 66, and other data
A server unit 68 having a server function such as a Web server capable of collecting operation result data of the operation unit 66, data stored in the memory unit 67, and other data into an HTML file or the like and distributing them as data that can be displayed on a browser; A clock unit 70 for performing time management. Here, the power monitor calculation unit 17 can rewrite each data such as the integrated power value recorded in the memory unit 67 of the main device unit 35 to an arbitrary value using the communication line 16 or the external terminal 25 or the like. Is configured.

The sensor input / output unit 65 is provided with the power measuring device 1
2, the power conditioner 7, and other devices 71 (for example, a gas usage measuring device, a water usage measuring device, a control device for an electric lock, an extension device for controlling information home appliances, etc., see FIG. 2) by the RS485 system, etc. Has a function of inputting and outputting data such as instantaneous power and integrated power. For example, when reading data, as shown in FIG. 6, the sensor input / output unit 65 sends a required time interval (for example, 5 seconds) to the power meter 12 or the transmission memory unit 51 (61) of the power conditioner 7. ~ 1
A transmission request is sent at 0 second intervals). Then, in response to this, the internal memory unit 48 (58) stores the transmission memory unit 51 (61).
The transmission memory unit 51 (61) transmits the data to the sensor input / output unit 65. When the data is received, the sensor input / output unit 65 sets the transmission memory unit 51 (6
The communication is performed by passing a terminator code such as ACK (data normal) or NAK (error) to 1), and retransmitting data in the case of NAK.

The memory unit 67 in the main unit 35 of the power monitor calculation unit 17 stores the integrated power value from the power meter 12 and the power conditioner 7 as shown in FIG. A primary memory unit 72 for storing data read from the device 71.

The calculating section 66 is based on the integrated power value read from the power measuring device 12 and the power conditioner 7 at the above-mentioned time interval by the sensor input / output section 65 and calculates the previously read integrated power value (primary memory section). A value obtained by subtracting the integrated power value read this time from the value stored in (72) is provided as a power amount at the time interval. Note that the integrated power value read this time is replaced with the storage in the primary memory unit 72.

Here, the amount of power from the power conditioner 7 is related to and corresponds to the amount of power generation A, and the amount of power from the power meter 12 is related to and corresponds to the amount of purchased power B or the amount of sold power C. Therefore, the arithmetic unit 66 calculates the above D = | (BorC)
By appropriately substituting these values into the equation of -A |, it is possible to calculate the power consumption D.

The memory unit 67 includes a secondary memory unit 73 that accumulates and stores the power consumption and the power generation amount obtained by the calculation unit 66 in units of time, and a tertiary memory unit 74 that accumulates and stores in units of days. , A quaternary memory unit 7 for storing and storing in monthly
5 is provided.

It is sufficient that the secondary memory unit 73 in units of time has a capacity of at least 24 hours. However, the secondary memory unit 73 has a capacity of two months for data backup and simulation. . It is sufficient that the tertiary memory unit 74 on a monthly basis has a capacity of at least 31 days (one month). However, the tertiary memory unit 74 has a capacity of two months for data backup and simulation. ing. Furthermore, a quaternary memory unit 7 for each month
5 is sufficient if it has a capacity of at least 12 months (1 year), but has a capacity of 2 years for data backup and simulation.

Further, the memory section 67 includes a fifth memory section 76 for storing the charge set value. Fifth memory unit 7
No. 6 can set a charge set value for each time zone. Specifically, for example, the charge setting value can be set by radio buttons in five stages by dividing a day into 24 time zones of one hour (see FIG. 12). It is sufficient that the fifth-level memory unit 76 for the charge set value has a capacity capable of storing at least one day's charge set value. However, the charge set value for one month is used for data backup and simulation. It has a capacity to store values and simulation results.

It should be noted that the memory unit 67 includes other devices 7
1 may be provided with a memory unit for storing various data, their integrated values, various calculation results, and the like.

The arithmetic unit 66 multiplies the instantaneous power and each data stored in the primary memory unit 72 to the quaternary memory unit 75 by the charge set value of the tertiary memory unit 76 to obtain a required electric charge. And a function for recalculating the electricity bill.

Then, as shown in FIG. 8, the server unit 68 converts the instantaneous electric power from the electric power meter 12 and the power conditioner 7 into a value that lasts for one hour.
Numerical display (kW display and circle display) and graph display (with maximum value display)
The first display area 81 to be displayed and the “power generation / usage difference” calculated from the “power consumption” and “power generation” are numerically displayed (k
A second display area 82 for displaying W and a circle), a third display area 83 for calculating whether to purchase or sell power and displaying an animation when money enters and exits the wallet, a power meter 12 and a power condition. "Today's power consumption" up to the current time based on the integrated power value and charge setting value from
A top page (initial display screen 85) having a fourth display area 84 for numerically displaying "today's power generation amount", "today's electricity rate", and "this month's electricity rate" can be created and distributed. Has become. When the solar cell 8 is not provided, the “power consumption” in the first display area 81 and the “
4, a top page (initial display screen 85) is prepared and distributed only with “Today's power consumption” and “Electricity rate for this month”.

The server section 68 has a display screen 86 for graphically displaying data in the secondary memory section 73 in units of time.
(FIG. 9), a display screen 87 (FIG. 10) for displaying the data of the tertiary memory unit 74 on a daily basis in a graph, and a display screen for displaying the data of the quaternary memory unit 75 on a monthly basis in a graph can be created and distributed. It has become. Each display screen can display the target value 88 on a graph. It is possible to shift to each of these display screens by selecting a “transition graph” button at the upper right of the top page (initial display screen 85). Conversely, it is possible to shift from each of these display screens to the top page (initial display screen 85) by selecting the "top page" button in the upper right. In addition, it is possible to switch between the display screens by selecting a “time unit”, “daily unit”, or “monthly unit” button at the bottom of the screen.

Further, the server section 68 displays a display screen for displaying a graph of the day-to-day ratio on the basis of the data of the secondary memory section 73 on a time basis, and a month-on-month graph on the basis of the data of the tertiary memory section 74 on a day basis. A display screen to be displayed, and a display screen 8 to display a year-on-year graph based on the data of the quaternary memory unit 75 on a monthly basis.
9 (FIG. 11) can be created and distributed. Each of these display screens has a top page (initial display screen 85)
By selecting the button of “transition graph” on the upper right of “”, the transition can be performed. Conversely,
From each of these display screens, the top page (initial display screen 8
The process can be shifted to 5) by selecting the button of "top page" at the upper right. In addition, between each display screen, "Previous day change"
By selecting the “YoY” button, the transition can be made.

In addition, the server section 68 can create and distribute a setting screen 90 (FIG. 12) for setting a power rate. The user can switch to the setting screen 90 by selecting the “Setting” button at the upper right of the top page (initial display screen 85). Conversely, from this setting screen 90, it is possible to return to the top page (initial display screen 85) by selecting the button of "stop" on the upper right.

Next, the operation of the first embodiment will be described.

As shown in FIG. 1, power from a commercial power supply 6 and power from a private power generator 9 such as a solar cell 8 are supplied to the distribution board 1 in the house. The electric power used in the home is mainly covered by the private power generator 9, and the shortfall is covered by the commercial power supply 6 (power purchase). On the other hand, when a surplus occurs in the power of the private power generator 9, the power is transmitted to the commercial power source 6 and purchased (power sale).

At this time, the power measuring device 12 provided in the distribution board 1 is connected to the branch point 11 of the branch trunk 10 in the main trunk 2.
And the electric power between the earth leakage breaker 3 of the commercial power source 6 and
The instantaneous power and the integrated power value from power-on to the present are stored.

Similarly, the power conditioner 7 of the private power generator 9 measures the amount of power generated by the solar cell 8 and stores the instantaneous power and the integrated power value from when the power is turned on to the present.

Then, the instantaneous power and the integrated power value of the power meter 12 and the power conditioner 7 are read into the power monitor calculation unit 17 via the communication line 16, and the power monitor calculation unit 17 Using the values, a predetermined calculation as described below is performed, and one hour, one day,
The required amount of electricity is calculated by calculating the amount of power for each unit time, such as one month, and further multiplying the amount of power by a set price.

That is, the power monitor calculation unit 17 performs the following operation based on the instantaneous power and the integrated power value read from the power meter 12 and the power conditioner 7.

First, the power monitor calculating section 17 stores the integrated power value from the power measuring device 12 and the power conditioner 7 in the primary memory section 72.

The operation unit 66 is provided with the sensor input / output unit 6
5 is currently read from the previously read integrated power value (the value stored in the primary memory unit 72) based on the integrated power values from the power meter 12 and the power conditioner 7 read at the above time intervals. The value obtained by subtracting the integrated power value is recorded as the amount of power at the time interval. Then, the integrated power value read this time is replaced as storage in the primary memory unit 72.

Next, the arithmetic unit 66 sets the amount of power from the power conditioner 7 as the amount of power generation A, and the amount of power from the power meter 12 as the amount of purchased power B or the amount of sold power C, and D = | (B
orC) -A | to calculate the power consumption D by appropriately using these values.

Then, the used power amount and the generated power amount obtained by the calculating unit 66 are stored in the secondary memory unit 73 in units of time and two months, and stored in the tertiary memory unit 74 in units of days. Two months 'worth is stored, and stored in the quaternary memory unit 75 on a monthly basis and two years' worth is stored.

The operation unit 66 multiplies the instantaneous power and each data stored in the primary memory unit 72 to the quaternary memory unit 75 by the charge set value of the tertiary memory unit 76, and Is calculated and recalculated.

At this time, a charge set value set for each time zone is used. Specifically, for example, the charge set value is divided into 24 time zones every hour, and is set using radio buttons in five stages.

Then, as shown in FIG. 8, the server unit 68 converts the instantaneous power from the power measuring device 12 and the power conditioner 7 into a value that is maintained for one hour.
Numerical display (kW display and circle display) and graph display (with maximum value display)
The first display area 81 to be displayed and the “power generation / usage difference” calculated from the “power consumption” and “power generation” are numerically displayed (k
A second display area 82 (W display and circle display), and a third display area 83 (calculation of power purchase or power sale) and animation display as money enters and exits the wallet (in the case of power purchase, It is an animation that goes out, and in the case of power sale, it is an animation that enters money), and from 0:00 of the day based on the integrated power value from the power meter 12 and the power conditioner 7 and the charge set value. A fourth display area 84 for numerically displaying “today's electric power consumption”, “today's power generation”, “today's electricity rate” up to the current time, and “the electricity rate for this month” from the first day of the month to the current time. A top page (initial display screen 85) having the following is created and distributed to the external terminal 25. When the solar cell 8 is not provided, the “power consumption” of the first display area 81 and the fourth display area 84
A top page (initial display screen 85) including only “current power consumption” and “this month's electricity rate” is created and distributed to the external terminal 25.

The server section 68 has a display screen 86 for graphically displaying the data in the secondary memory section 73 in time units.
(FIG. 9), a display screen 87 (FIG. 10) for displaying the data of the tertiary memory unit 74 on a daily basis in a graph, and a display screen for displaying the data of the quaternary memory unit 75 in a graph on a monthly basis. Distribute to Each display screen has a target value of 8
8 can be displayed on a graph so that it can be easily visually recognized whether or not the target power amount has been exceeded. By selecting the “Transition graph” button at the top right of the top page (initial display screen 85),
Can be migrated. Conversely, it is possible to shift from each of these display screens to the top page (initial display screen 85) by selecting the "top page" button in the upper right. In addition, between each display screen, "time unit" at the bottom of the screen
The transition can be made by selecting the "daily unit" or "monthly unit" button.

Further, the server unit 68 displays a display screen for displaying a graph of the day-to-day ratio based on the data of the secondary memory unit 73 on a time basis, and a month-on-month graph based on the data of the tertiary memory unit 74 on a daily basis. A display screen to be displayed, and a display screen 8 to display a year-on-year graph based on the data of the quaternary memory unit 75 on a monthly basis.
9 (FIG. 11) and distribute it to the external terminal 25. By selecting the “Transition graph” button at the top right of the top page (initial display screen 85),
Can be migrated. On the other hand, it is possible to shift from each of these display screens to the top page (initial display screen 85) by selecting the button of “top page” at the upper right. In addition, between each display screen, "Previous day" at the bottom of the screen
The transition can be made by selecting the “M / M” and “Y / Y” buttons.

In addition, the server unit 68 creates a setting screen 90 (FIG. 12) for setting a power rate, etc.
Distribute to The display can be shifted to this display screen by selecting the "Setting" button on the top right of the top page (initial display screen 85). Conversely, from this display screen, it is possible to return to the top page (initial display screen 85) by selecting the “stop” button on the upper right.

Further, a setting screen 90 for setting a power rate, etc.
In FIG. 12, the charge set value can be changed. With this change, the electricity charge is recalculated and reflected on each screen. Thereby, a simulation of the electricity bill can be performed. Also, 5 for price setting
By increasing the capacity of the next memory unit 76, 1
Monthly charge simulation can be performed.

The power monitor calculation unit 17 includes a personal computer serving as a power monitor display device, an Internet terminal, and an ST.
A connection can be made from an external terminal 25 such as B (set top box) via a network such as the Internet or a home network.

For example, from an external terminal 25 connected to the Internet, a CATV line 27, a cable modem 2
6 can be directly connected to the power monitor calculation unit 17. Alternatively, an external terminal 25 connected to the Internet can indirectly connect to the power monitor calculation unit 17 via the general public line 29 and the home network device 28. In addition, by connecting the external terminal 25 to the information outlet 31 in the house, the external terminal 25 can be easily connected to the power monitor calculation unit 17 via the in-home network device 28 from any room.

The external terminal 25 can display the information distributed by the power monitor calculation unit 17 and change various settings by operating the power monitor calculation unit 17. As a result, the user can simulate whether or not the fee system that he or she is currently contracting is optimal, and can select the optimal fee system and change the contract based on the result of the simulation.

When the power meter 12 has failed, a command is sent from the external terminal 25 to the power monitor calculator 17 so that the primary memory 7 of the power monitor calculator 17 can be operated.
The integrated power value stored in 2 can be transmitted to the replaced power measuring device 12 via the communication line 16 and written to the integrated power memory 47. Similarly, when the power conditioner 7 fails, the integrated power memory 57 of the power conditioner 7 is connected via the communication line 16.
The integrated power value stored in the primary memory unit 72 of the power monitor operation unit 17 can be written into the power monitor calculation unit 17.

On the other hand, when the power monitor calculation unit 17 has failed, a command is sent from the external terminal 25 to the replaced power monitor calculation unit 17 so that the command is stored in the integrated power memory 47 of the power meter 12. The stored integrated power value can be written to the primary memory unit 72 of the replaced power monitor calculation unit 17 via the communication line 16.

As a result, the power company can access the power monitor 18 via the Internet to repair a failure, change data, backup data, and the like.

[0062]

As described above, according to the first aspect of the present invention, it is possible to easily monitor the electricity bill through the power monitor calculation unit.

According to the second aspect of the present invention, the charge set value can be finely set for each time zone, and a more accurate electricity charge can be obtained through the power monitor calculation unit.

According to the third aspect of the present invention, even when the charge is changed, it is possible to easily respond by changing the charge set value. Further, by changing the charge set value, a practically useful effect that an optimum charge set value can be obtained by performing a simulation can be exerted.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram according to a first embodiment of the present invention.

FIG. 2 is a block diagram mainly showing a power monitor calculation unit of FIG. 1;

FIG. 3 is an internal block diagram of a power meter.

FIG. 4 is an internal block diagram of the power conditioner.

FIG. 5 is an internal block diagram of a power monitor calculation unit.

FIG. 6 is a diagram illustrating a communication procedure between a power monitor calculation unit and a power meter or a power conditioner.

FIG. 7 is an internal block diagram of a memory unit of the power monitor calculation unit.

FIG. 8 is a diagram showing a top page distributed by a server unit.

FIG. 9 is a diagram showing a display in units of time distributed by a server unit.

FIG. 10 is a diagram showing a display on a daily basis distributed by a server unit.

FIG. 11 is a diagram showing a display of a year-on-year change distributed by a server unit.

FIG. 12 is a diagram showing a setting screen distributed by a server unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Power measuring device 15 Sensor means for power detection 16 Communication line 17 Power monitor operation part 18 Power monitor device 25 External terminal

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Kenji Kawamoto 32 Wadai, Tsukuba, Ibaraki Sekisui Chemical Co., Ltd. (72) Inventor Jin Hikida 492 Minosho-cho, Yamatokoriyama-shi, Nara Prefecture Sharp Corporation

Claims (3)

[Claims] 1. A power measuring device for measuring instantaneous power based on a voltage value and a current value from a power detecting sensor means, and continuously integrating the instantaneous power to calculate and record an integrated power value; A power monitor calculation unit that is connected to the device via a communication line and calculates an amount of power per unit time from the integrated power value read from the power measurement device, wherein the power monitor calculation unit includes a charge set value and the power A power monitoring device capable of calculating an electricity bill by using a quantity and an electricity rate. 2. The power monitoring device according to claim 1, wherein the charge set value can be set for each time zone. 3. The power monitor operation unit according to claim 1, wherein the charge set value can be changed, and the electricity charge can be recalculated in accordance with the change in the charge set value. Power monitoring device.