JP2009168726A - Electric power measuring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power measuring instrument capable of solving a problem wherein the rate of its standby power requirement to the total power consumption is very high. <P>SOLUTION: A power detection means 20 measures a value of power supplied from a power supply 1001 to a load apparatus 1002 and outputs the power value. An integration signal command means 30 receives the power value from the power detection means 20 and compares it by a pre-stored set value according to the standby power requirement and the operating power of a load apparatus 1002. An integration signal command means 30 determines whether the load apparatus 1002 is in service or not from the result of comparison. When determining that the load apparatus 1002 is not in service, the integration signal command means 30 submits an integration command indicating "calculation of integral power consumption of standby power requirement". While receiving the integration signal from the integration signal command means 30, a calculation means 40 integrates power values sent from the power detection means 20 and calculates the integrated power value of the standby power requirement. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a power measuring device that measures the power consumption of a load device, and in particular, is connected to a load device in a power consumer such as a home or office, measures the power consumption of the load device, The present invention relates to an electric power measuring apparatus that displays various information such as an emission conversion amount of carbon dioxide accompanying electric power consumption and an electric charge.

  FIG. 7 is a block diagram showing a configuration of a conventional power measuring apparatus. In FIG. 7, the power measuring apparatus 1 includes a power detection unit 2, a calculation unit 3, a display unit 4, and a connection unit 5, and operates as follows.

  The power measuring apparatus 1 is connected to a power source 6 such as an AC 100V outlet. In addition, the load device 7 is connected to the power measurement device 1 through the outlet-shaped connection unit 5 built in the power measurement device 1.

The power detection unit 2 measures the power supplied from the power source 6 to the load device 7 and inputs the measurement result to the calculation unit 3 as power data. The calculation means 3 uses, for example, a timer built in the calculation means 3 and necessary data such as the CO ₂ emission amount per unit power amount and the electric charge, and the integrated power of the power consumed by the load device 7 The amount, the CO ₂ emission amount according to the integrated power amount, the electricity rate, etc. are obtained, and the obtained data is input to the display means 50. The display means 50 displays the input data.

Thereby, the user of the load device 7 can grasp the power consumption, the CO ₂ emission amount, the electricity bill, and the like of each load device 7. For this reason, it becomes possible for the user to devise the usage method and frequency of use of the load device 7 and to promote the user's energy saving behavior.

As such a power measuring device, for example, there is an eco watt described in Non-Patent Document 1.
Enegate Co., Ltd., “Ecowatt catalog”, [online], [Search January 8, 2008], Internet <URL: http://www.enegate.co.jp/ecowat_r.pdf>

  The load device consumes power called standby power even when it is stopped. This standby power is very small compared to the operating power consumed during operation of the load device, but there is a problem that when it is integrated with the unused time of the load device, it becomes a large percentage of the total power consumption. . For example, standby power can be obtained from the reference literature (Residential Environment Research Institute, “Standby power survey results”, [online], [Search January 8, 2008], Internet <URL: http://www.jyuri.co. As reported in jp / Standby2001 / standby_Frameset.htm>), it accounts for about 10% of household power consumption, and it cannot be ignored for all power consumption.

  The conventional power measuring apparatus 1 shown in FIG. 7 calculates the integrated power amount by integrating the power regardless of whether the load device is stopped or operating as shown in FIG. For this reason, it is impossible to distinguish the standby power and the operating power of the load device, and the user cannot grasp the standby power of the load device. Therefore, the user does not know to which load device energy saving measures should be taken in order to reduce standby power. Therefore, the user cannot reduce standby power, and the effect of reducing the overall power consumption is small.

  Therefore, an object of the present invention is to provide a power measuring apparatus that solves the problem that standby power is a large proportion of total power consumption.

  A power measuring device according to the present invention is a power measuring device that can be connected to a load device that operates by power supplied from a power source, measures a power value supplied from the power source to the load device, and calculates the power value. The output power detection means, the set value set according to the standby power and the operating power of the load device are stored in advance, the power value received from the power detection means is collated with the set value, and the collation result Accordingly, it is determined whether or not the load device is stopped, and if it is determined that the load device is stopped, a power integration execution command means for issuing an integration command representing calculation of an integrated power amount of the standby power, and the power Calculating means for calculating the integrated power amount of the standby power by integrating the power values received from the power detection means when the integration command is received from the integration execution command means.

  According to the present invention, it is possible to reduce the ratio of standby power to total power consumption.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, in each drawing, the same code | symbol is attached | subjected to what has the same function, and description of the function may be abbreviate | omitted.

  FIG. 1 is a block diagram showing the configuration of the power measuring apparatus according to the first embodiment of the present invention.

  In FIG. 1, the power measuring apparatus 1000 is connected between a power source 1001 and a load device 1002.

  The power source 1001 is, for example, a commercial power source, and is an AC 100V outlet. The load device 1002 is, for example, a household electrical appliance, and operates with power supplied from the power source 1001. Note that the power consumption of the load device 1002 includes standby power consumed while the load device 1002 is stopped and operating power consumed while the load device 1002 is operating.

  The power measuring apparatus 1000 includes a connection unit 10, a power detection unit 20, an integration signal command unit 30, a calculation unit 40, a display unit 50, and a switch 60. Note that the power supplied from the power source 1001 is supplied to the load device 1002 via the power detection unit 20, the switch 60, and the connection unit 10 in this order.

  The connection unit 10 can be connected to the load device 1002. The connection unit 10 has, for example, an outlet shape.

  The power detection unit 20 measures the power value supplied from the power source 1001 to the load device 1002 and outputs the power value as power data.

  The integration signal command means 30 stores in advance set values that are set according to the standby power and operating power of the load device 1002.

  Moreover, the integration signal command means 30 collates the power data received from the power detection means 20 with the stored set value constantly or periodically. The integration signal command unit 30 determines whether or not the load device 1002 is stopped according to the collation result.

  When determining that the load device 1002 is stopped, the integration signal command means 30 outputs an integration execution command signal indicating “calculation of the integrated power amount of standby power”, and when determining that the load device 1002 is operating, An integration execution command signal indicating "calculation of integrated power amount" is output.

  The calculation means 40 calculates power consumption information related to the power consumption of the load device 1002 based on the integration execution command signal received from the integration signal command means 30 and the power data received from the power detection means 20. The calculation means 40 holds the power consumption information and outputs it to the display means 50.

  The power consumption information includes standby power information related to standby power and operating power information related to operating power.

The standby power information includes the standby power itself, the accumulated power amount of the standby power (integrated standby power amount), the CO ₂ emission amount (integrated standby CO ₂ conversion amount) discharged by generating the power corresponding to the integrated standby power amount, the integrated standby Electricity charges (cumulative standby electricity charges), etc., for the amount of electric power.

In addition, the operating power information includes the operating power itself, the integrated operating power amount (integrated operating power amount), the CO ₂ emission amount (integrated operating CO ₂ equivalent amount) discharged by generating the power corresponding to the integrated operating power amount, For example, an electricity charge (integrated operation electricity charge) as a consideration for the electric power corresponding to the integrated operation electric energy.

  When the calculation means 40 receives an integration execution command signal representing “calculation of integrated power amount of standby power” from the integration signal command means 30, the calculation means 40 obtains standby power information based on the power data received from the power detection means 20. calculate.

  In addition, when the calculation means 40 receives an integration execution command signal representing “calculation of the cumulative amount of operating power” from the integration signal command means 30, the calculation means 40 operates based on the power data received from the power detection means 20. The operating power information related to is calculated.

Specifically, the calculation means 40 performs the following processing. The calculating means 40 has a built-in timer. Further, the calculation means 40 holds in advance conversion amount data indicating the CO ₂ conversion amount per unit power amount and charge data indicating the electricity rate per unit power amount.

  First, the calculation means 40 confirms the integration execution command signal every predetermined time using a built-in timer. When the integration execution command signal indicates “calculation of the integrated power amount of standby power”, the calculation means 40 calculates standby power information, and the integration execution command signal indicates “calculation of the integrated power amount of operating power”. In the case, operating power information is calculated.

  In the standby power information calculation process, the calculation means 40 calculates the power data as standby power, integrates the standby power, and calculates the integrated standby power amount. More specifically, the calculation means 40 calculates the amount of power by multiplying the standby power by a predetermined time, and newly calculates the integrated standby power amount in addition to the integrated standby power amount that holds the power amount. .

Subsequently, the computing means 40 calculates the integrated standby CO ₂ converted amount using the integrated standby power amount and the converted amount data, calculates the integrated standby electricity rate using the integrated standby power amount and the charge data, and sets the standby power The information calculation process ends.

  Note that the operation power information calculation process is simply described as “standby” as “operation” in the standby power information calculation process, and thus detailed description thereof is omitted.

  The display unit 50 displays the power consumption information received from the calculation unit 40.

  The switch 60 can be operated from the outside of the power measuring apparatus 1000, and switches between the supply of power from the power source 1001 to the load device 1002 and the stop of the supply by the operation from the user.

  Next, the effect will be described.

  The power detection unit 20 measures the power value supplied from the power source 1001 to the load device 1002 and outputs the power value as power data. The integration signal command means 30 collates the power data received from the power detection means 20 with the set value. The integration signal command unit 30 determines whether or not the load device 1002 is stopped according to the collation result. When determining that the load device 1002 is stopped, the integration signal command unit 30 issues an integration command representing “calculation of the integrated power amount of standby power”. The calculation means 40 integrates the power values received from the power detection means 20 when receiving the integration signal from the integration signal command means 30, and calculates the integrated power amount of standby power.

  In this case, when an integrated signal representing “calculation of integrated power amount of standby power” is accepted, the power values are integrated to calculate the integrated power amount of standby power. For this reason, the user can grasp the standby power of the load device 1002. Therefore, since it is clear which load device 1002 should be subjected to energy saving measures, the user can accurately disconnect the load device 1002 having a large standby power from the power source 1001. Therefore, standby power can be reduced, and the ratio of standby power to the overall power consumption can be reduced.

  In the present embodiment, the switch 60 stops the supply of power from the power source 1001 to the load device 1002 by an operation from the user.

  In this case, when the user attempts to disconnect from the power supply 1001 of the load device 1002, it is not necessary to disconnect the connection unit such as an outlet. For this reason, convenience is good, it becomes easy to make the device disconnection habit at the time of stop, and the effect of reducing standby power increases.

  Further, in this embodiment, when the integrated signal command unit 30 determines that the load device 1002 is operating, the integrated signal command unit 30 outputs an integrated command indicating “calculation of the integrated amount of operating power”. The calculating means 40 calculates the integrated power amount of the operating power by integrating the power values received from the power detecting means 20 when receiving the integrated signal from the integrated signal command means 30.

  In this case, the user can grasp not only standby power but also operating power.

  In the present embodiment, the calculation means 40 outputs the integrated power amount. The display unit 50 displays the integrated power amount received from the calculation unit 40.

  In this case, it is possible to allow the user to grasp the accumulated power amount of standby power without using an external display device.

  Next, a second embodiment will be described.

  FIG. 2 is a block diagram showing the configuration of the power measuring apparatus according to the second embodiment of the present invention. 2 shows a power measuring apparatus 1000 in the case where the integrated signal command means 30 in the configuration shown in FIG.

  In the power comparator 31, a set power value corresponding to the standby power and operating power of the load device 1002 is stored in advance as a set value. The set power value is larger than the standby power value of the load device 1002 and smaller than the minimum value of the operating power of the load device 1002.

  The power comparator 31 collates the power value received from the power detection unit 20 with the set power value. The power comparator 31 issues an integration execution command signal indicating “execution” when the power value is smaller than the set power value, and outputs an integration execution command signal indicating “stop” when the power value is greater than the set power value. To emit. When the power value is equal to the set power value, the power comparator 31 may be set to issue an integration execution command signal representing “execution” or may issue an integration execution command signal representing “stop”. May be set. The integration execution command signal indicating “execution” is an example of an integration command indicating calculation of the integrated value of standby power.

  When receiving the integration execution command signal representing “execution” from the integration signal command unit 30, the calculation unit 40 calculates standby power information related to standby power based on the power data received from the power detection unit 20. Here, the arithmetic unit 40 does not calculate the standby power information and the operating power information when receiving the integration execution command signal indicating “stop” from the integration signal command unit 30.

  Further, the measurement range of the power detection means 20 is set according to the standby power within a range where the upper limit does not fall below the set power value. For example, the measurement range is desirably set to a narrow range of several times the standby power within a range where the lower limit is 0 and the upper limit is not less than the set power value.

  Next, the operation will be described.

  FIG. 3 is an explanatory diagram for explaining the operation of the power measuring apparatus 1000 according to the present embodiment.

  The power comparator 31 collates the power value received from the power detection unit 20 with the set power value. The power comparator 31 issues an integration execution command signal indicating “execution” when the power value is smaller than the set power value, and outputs an integration execution command signal indicating “stop” when the power value is greater than the set power value. To emit. The power comparator 31 outputs the integration execution command signal to the calculation means 40.

  The calculation means 40 calculates standby power information based on the power value received from the power detection means only when the integration execution command signal received from the power comparator 31 represents “execution”. The calculation means 40 outputs the standby power information to the display means 50.

  Further, when the integration execution command signal received from the power comparator 31 shifts from “execution” to “stop”, the calculation means 40 holds standby power information at the time of the shift, and also stores the standby power information. Output to the display means 50.

  Furthermore, when the integration execution command signal received from the power comparator 31 shifts from “stop” to “execution”, the arithmetic means 40 starts again the integration of the held standby power information.

  Next, the effect will be described.

  According to the present embodiment, the power comparator 31 determines that the load device 1002 is stopped when the power value received from the power detection means 20 is smaller than the set power value, and the power value is greater than the set power value. The load device 1002 is determined to be operating.

  In this case, it is possible to easily determine whether or not the load device 1002 is stopped.

  In the present embodiment, the measurement range of the power detection means 20 is set according to the standby power within a range where the upper limit does not fall below the set power value.

  The operating power is very large compared to the standby power. Moreover, the measurement range of the power detection means of the conventional power measurement device is set according to the operating power of the load device. For this reason, in the conventional power measuring device, the measurement accuracy of the standby power is very low. Therefore, in the conventional power measuring device, there is a problem that even if the user holds the load device in the standby state and tries to measure the standby power, the standby power cannot be accurately grasped.

  However, in the present embodiment, since the measurement range is set according to the standby power, it is possible to increase the measurement accuracy of minute standby power, and to accurately grasp the standby power. Since the upper limit of the measurement range does not fall below the set power value, it is possible to determine whether or not the power value of the load device 1001 is greater than the set power value.

  Next, a third embodiment will be described.

  FIG. 4 is a block diagram showing the configuration of the power measuring apparatus according to the third embodiment of the present invention. FIG. 4 shows a power measuring apparatus 1000 when the integrated signal command means 30 in the configuration shown in FIG.

  When the load device 1002 is in the standby state, the value obtained by time differentiation of the power measured by the power detection means 20 (power differential value) is almost zero. When operating power is supplied to the load device 1002 and the load device operates, the power differential value increases instantaneously (see FIG. 3). In the present embodiment, a power measuring apparatus that calculates standby power information using this will be described.

  In the time differential measuring instrument 32, a set power differential value set in accordance with the standby power and operating power of the load device 1002 is stored in advance as a set value. The set power differential value is greater than zero.

  The time differential measuring instrument 32 calculates the power differential value by performing time differentiation on the power data received from the power detection means 20. The time differential measuring instrument 32 collates the power differential value with the set power differential value. The time differential measuring instrument 32 determines that the load device 1002 is stopped when the power differential value is smaller than the set power differential value, and determines that the load device 1002 is operating when the power differential value is larger than the set power differential value. to decide.

  Next, the effect will be described.

  In the present embodiment, the time differential measuring instrument 32 calculates the power differential value by performing time differentiation on the power value measured by the power detection means 20. Further, when the power differential value is smaller than the set power differential value, the time differential measuring instrument 32 determines that the load device 1002 is stopped, and when the power differential value is larger than the set power differential value, the load device 1002 operates. Judged as medium.

  In this case, it is possible to easily determine whether or not the load device 1002 is stopped.

  Next, a fourth embodiment will be described.

  FIG. 5 is a block diagram showing the configuration of the power measuring apparatus according to the fourth embodiment of the present invention.

  In FIG. 5, the power measuring apparatus 1000 is connected to a plurality of load devices 1002. The power measuring apparatus 1000 further includes a branching unit 70 in addition to the configuration shown in FIG. Further, there are a plurality of connection units 10, power detection means 20, and switches 60.

  Here, each of the connection units 10 can be connected to any one of the load devices 1002. Further, each of the power detection means 20 is associated with one of the connection units 10 on a one-to-one basis. Furthermore, each of the switches 60 is associated with one of the connection units 10 on a one-to-one basis, and is associated with the power detection unit 20 corresponding to the connection unit 10 on a one-to-one basis. In addition, the corresponding power detection means 20, switch 60, and connection unit 10 constitute a supply path for supplying power to the load device 1002.

  The branching unit 70 branches the power supplied from the power supply 1001. The branched power is supplied to the load device 1002 connected to the supply path via any one of the supply paths.

  Each of the switches 60 switches between the supply of power to the load device 1002 connected to the connection unit 10 corresponding to the switch 60 and the stop of the supply from the power source 1001 by an operation from the user.

  Each of the power detection means 20 holds unique identification information. This identification information is used as identification information for specifying the load device 1002 connected to the connection unit 10 corresponding to the power detection means 20.

  Each of the power detection means 20 measures the power value supplied to the load device 1002 connected to the connection unit 10 corresponding to the self-power detection means 20, and outputs the measured power value as power data. At this time, the power detection means 20 outputs the power data with the identification information held therein.

  As a result, the power detection means 20 individually measures the power value supplied to each of the load devices 1002, and outputs each of the power values with identification information that identifies the load device having that power value. Become.

  For each piece of identification information, integrated signal command means 30 stores a set value set in accordance with standby power and operating power of load device 1002 specified by the identification information in association with each other.

  Further, the integration signal command unit 30 individually collates each power value received from the power detection unit 20 with a set value corresponding to the identification information attached to the power value. The integrated signal command means 30 determines for each load device 1002 whether or not the load device 1002 is stopped based on each of the verification results.

  When there is a load device 1002 that is determined to be stopped, the integration signal command means 30 issues an integration command that indicates “calculation of the integrated power amount of standby power” with an identifier that identifies the load device 1002.

  Further, when there is a load device 1002 that is determined to be operating, the integration signal command means 30 issues an integration command that represents “calculation of the integrated amount of operating power” with an identifier that identifies the load device 1002.

  When the calculation means 40 accepts an integration command representing "calculation of the integrated power amount of standby power" from the integration signal command means 30, the power value with the identification information attached to each identification information attached to the integration command , And the integrated power amount of standby power is calculated for each load device 1002.

  In addition, when the calculation means 40 accepts an integration command representing “calculation of the integrated amount of operating power” from the integration signal command means 30, the identification information is attached to each identification information attached to the integration command. The power value is integrated, and the integrated amount of operating power is calculated for each load device 1002.

  Although there are a plurality of power detection means 20 in this embodiment, one power detection means 20 may be used. In this case, the power detection unit 20 individually measures the power value supplied to each of the load devices 1002 by individually measuring each power value of the power branched by the branching unit 70.

  Here, the power detection means 20 knows through which connection part 10 each of the power branched by the branching means 70 is supplied to the load device 1002 and identifies the connection part 10. The information is held as identification information for identifying the load device 1002 having the power value. And if the electric power value is measured separately, the electric power detection means 20 will attach and output the identification information which identifies the load apparatus of the electric power value to each electric power value, and will output.

  Next, the effect will be described.

  In the present embodiment, the power detection means 20 individually measures the power value supplied to each of the load devices 1002, and outputs each of the power values with identification information that identifies the load device of that power value. . The integration signal command unit 30 individually collates each power value received from the power detection unit 20 with a set value corresponding to the identification information attached to the power value. The integrated signal command means 30 determines for each load device 1002 whether or not the load device 1002 is stopped based on each of the verification results. When there is a load device 1002 that is determined to be stopped, the integration signal command means 30 issues an integration command representing “calculation of the integrated power amount of standby power” with an identifier that identifies the load device 1002. When the calculation means 40 accepts an integration command representing "calculation of the integrated power amount of standby power" from the integration signal command means 30, the power value with the identification information attached to each identification information attached to the integration command And the integrated standby electric energy is calculated for each load device 1002.

  In this case, it is possible to grasp standby power of a plurality of load devices 1002 with a single power measuring device 1000.

  Next, a fifth embodiment will be described.

  FIG. 6 is a block diagram showing the configuration of the power measuring apparatus according to the fifth embodiment of the present invention.

  In FIG. 6, power measuring apparatus 1000 further includes integrated signal command means 80 and calculation means 90 in addition to the configuration shown in FIG. 1.

  When determining that the load device 1002 is stopped, the integration signal command means 30 issues an integration execution command signal indicating “representing calculation of the integrated power amount of standby power”, while determining that the load device 1002 is operating. An integration execution command signal indicating “stop” is issued.

  Further, the integrated signal command means 80 stores a set value in advance. The power data received from the power detection means 20 is collated with the set value. The integrated signal command means 80 determines whether or not the load device 1002 is stopped according to the collation result.

  When determining that the load device 1002 is stopped, the integration signal command means 80 outputs an integration execution command signal “representing calculation of the integrated power consumption of the operating power”, while determining that the load device 1002 is operating, “ An integration execution command signal indicating “stop” is output.

  When the calculation means 90 accepts an integration execution command signal representing “calculation of the cumulative amount of operating power” from the integration signal command means 80, the calculation means 90 relates to the operating power based on the power data received from the power detection means 20. Calculate operating power information. The calculation means outputs the operating energy information to the display means 50.

  Note that the process of calculating the operating power information by the calculating unit 90 is the same as the process of calculating the operating power information by the calculating unit 40 in the first embodiment, and thus detailed description thereof is omitted.

  Next, the effect will be described.

  The integration signal command unit 80 collates the power data received from the power detection unit 20 with the set value, and determines whether or not the load device 1002 is stopped according to the collation result. When it is determined that the load device 1002 is in operation, the integration signal command unit 80 issues an integration command indicating “calculation of integrated power consumption of operating power”. When the integration signal is received from the integration signal command unit 30, the calculation unit 90 integrates the power value received from the power detection unit 20 to calculate the integrated power amount of the operating power.

  In this case, when calculating each of the standby power and the integrated power amount of the operating power, one calculation unit does not have to calculate both the standby power and the integrated power amount of the operating power. For this reason, it is possible to simplify the process for allowing the user to grasp not only standby power but also operating power.

  In each of the embodiments described above, the illustrated configuration is merely an example, and the present invention is not limited to the configuration.

It is the block diagram which showed the structure of the electric power measuring apparatus of the 1st Example of this invention. It is the block diagram which showed the structure of the electric power measurement apparatus of the 2nd Example of this invention. It is explanatory drawing for demonstrating operation | movement of the electric power measurement apparatus of the 2nd Example of this invention. It is the block diagram which showed the structure of the electric power measurement apparatus of the 3rd Example of this invention. It is the block diagram which showed the structure of the power measuring device of the 4th Example of this invention. It is the block diagram which showed the structure of the electric power measurement apparatus of the 5th Example of this invention. It is the block diagram which showed the structure of the conventional power measuring device. It is explanatory drawing for demonstrating the problem of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Connection part 20 Electric power detection means 30 Accumulation signal command means 40 Calculation means 50 Display means 60 Switch 70 Branch means 1000 Power measuring device 1001 Power supply 1002 Load apparatus

Claims (9)

A power measuring device that can be connected to a load device that operates with power supplied from a power source,
A power detection means for measuring a power value supplied from the power source to the load device and outputting the power value;
A setting value set according to the standby power and operating power of the load device is stored in advance, the power value received from the power detection unit is checked against the set value, and the load device Determining whether or not the load device is stopped, and determining that the load device is stopped, a power integration execution command means for issuing an integration command representing calculation of the integrated power amount of the standby power; and
A power measuring device comprising: an arithmetic unit that, when receiving the integration command from the power integration execution command unit, calculates the integrated power amount of the standby power by integrating the power values received from the power detection unit. The power measuring device according to claim 1,
The power integration execution command means stores a set power value as the set value, and when the power value is smaller than the set power value, determines that the load device is stopped, and the power value is the set power value. A power measuring device that is a power comparator that determines that the load device is in operation when the load device is larger. The power measuring device according to claim 1,
The power integration execution command unit stores a set power differential value as the set value, calculates a power differential value by time-differentiating the power value received from the power detection unit, and the power differential value is the set power differential value A power measurement device that is a time differential measuring instrument that determines that the load device is stopped when the load device is smaller than the value, and determines that the load device is operating when the power differential value is larger than the set power differential value . In the electric power measuring device according to claim 2,
The power measuring device, wherein the measurement range of the power detection means is set according to the standby power within a range where the upper limit is not less than the set power value. In the electric power measurement device according to any one of claims 1 to 4,
An electric power measuring device including a switch that stops supply of electric power from the power source to the load device by an operation from a user. In the electric power measuring device according to any one of claims 1 to 5,
There are a plurality of the load devices,
The power detection means individually measures a power value supplied to each of the plurality of load devices, outputs the power value with identification information for identifying the load device having the power value,
The power integration execution command means stores, for each of the identification information, a set value set in accordance with standby power and operating power of the load device specified by the identification information in association with each other, and the power detection Each of the power values received from the means is individually verified with a set value corresponding to the identification information attached to the power value, and based on each of the verification results, whether or not the load device is stopped When there is the load device that is determined for each load device and is determined to be stopped, the integration command with identification information that identifies the load device is issued,
When the calculation unit receives the integration command from the power integration execution command unit, the calculation unit integrates the power value with the identification information for each identification information attached to the integration command, and integrates the standby power A power measuring device comprising: a calculation means for calculating a power amount for each load device. In the electric power measuring device according to any one of claims 1 to 5,
When determining that the load device is in operation, the power integration execution command means issues an integration command representing calculation of the integrated power amount of the operating power,
When the calculation means receives an integration designation representing calculation of the integrated power amount of the operating power from the power integration execution command means, the calculation means integrates the power value received from the power detection means, and integrates the operating power A power measuring device that further calculates the amount of power. In the electric power measuring device according to any one of claims 1 to 5,
The set value is stored in advance, the set value is compared with the power value received from the power detection unit, and it is determined whether the load device is stopped according to the comparison result, and the load device Is determined to be in operation, second power integration execution command means for issuing an integration command representing calculation of the integrated power amount of the operating power;
A power measurement unit that includes a calculation unit that, when receiving the integration command from the second power integration execution command unit, integrates the power value received from the power detection unit and calculates an integrated power amount of the operating power. apparatus. In the electric power measuring device according to any one of claims 1 to 8,
The calculation means outputs the integrated electric energy,
A power measuring device including display means for displaying the integrated power amount received from the calculation means.

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