JP2020110029A - Power measurement device and power measurement method - Google Patents

Abstract

To provide a power measurement device and a power measurement method which measure power consumption with high accuracy even when loads in various forms are connected.SOLUTION: A power measurement device 100 comprises: a main current sensor 1 that measures a current on a main electric wire La connected to a main breaker 4; a branch current sensor 2 that measures a current on an electric wire Lb connected to a branch breaker 5 which is not included in the main; and a power calculation unit 3 that calculates a total power usage on the basis of the respective measurement values of the main current sensor 1 and the branch current sensor 2. The power calculation unit 3 has setting means 7 which can designate the branch breaker 5, which is not included in the main, and sets a voltage of the branching breaker 5. The power calculation unit 3 calculates the total power usage on the basis of the measurement value of the main current sensor 1 and the voltage setting of the branch breaker 5 designated so that it is not included in the main by the setting means 7 and the measurement value of the branch current sensor 2 connected to the branch breaker 5.SELECTED DRAWING: Figure 1

Description

The present invention relates to a power measuring device and a power measuring method capable of easily measuring the total power used based on the current of a main breaker and the current of a branch breaker not included in the main.

For example, Patent Document 1 is known as a technique capable of measuring the power of a main breaker.
The power monitoring system disclosed in Patent Document 1 is provided with a main/power consumption sensor unit that measures the amount of electric power on the power line from the system power line and on the downstream side of the main breaker.
Further, in the power monitoring system, on the downstream side of the main breaker, the distribution board that branches the power line from the system power line into a plurality of power lines, and the amount of power in the power line that is branched in the distribution board And a branching/power sensor unit that separately measures for each transmission direction.
Then, the measured values of the master/power consumption sensor unit and the measured values of the branch/power sensor unit are transmitted to the calculation unit, and the calculation unit calculates the total power consumption.

JP, 2005-177652, A

By the way, in the above power monitoring system, a main/power consumption sensor unit that measures the amount of power of the power line that directly communicates with the main breaker, and a branch/power sensor that measures the amount of power of each of the multiple power lines branched in the distribution board. All measured values from the department are collected to calculate the total power consumption.
However, at present, various load devices are connected via a distribution board or not, and when the electric wire is a single-phase three-wire type, various load devices with different voltages are mixed. This makes it difficult to accurately calculate the amount of power consumption.

The following two points are shown as specific problems.
The first problem is that the electric power of the load device (nighttime water heater, etc.) of the branch breaker branched on the inlet wiring does not pass through the main breaker. Therefore, there is a problem that the total power consumption including the load device of the branch breaker branched on the lead-in wire cannot be calculated only by the current transformer attached in the immediate vicinity of the main breaker.
The second problem is that even if the electric power of the load equipment (night water heater, etc.) of the branch breaker branched on the inlet wiring is measured, there is no means to reflect it in the total electric power used, so the total electric power used by the customer There is a problem that the electric power and the total purchased electric power cannot be easily grasped indoors.

The present invention has been made in view of the above-mentioned circumstances, and a power measuring device capable of measuring power consumption with high accuracy even when load devices of various forms are connected to a main trunk, An electric power measurement method is provided.

In order to solve the above problems, the present invention proposes the following means.
In the power measuring device according to the first aspect of the present invention, a main current sensor for measuring the current of the electric wire connected to the main breaker, and a branch current sensor for measuring the electric current of the electric wire connected to the branch breaker branched from the main trunk. And a power calculation unit that calculates the total amount of power consumption based on the measured values of the main current sensor and the branch current sensor, the power calculation unit being capable of designating a branch breaker not included in the main trunk, and A setting means for setting the voltage of the breaker is provided, and together with the measurement value of the main current sensor, the voltage setting of the branch breaker designated not to be included in the main trunk by the setting means and the branch current sensor connected to the branch breaker. The total power consumption is calculated based on the measured value of.

In the power measuring method according to the second aspect of the present invention, a main current measuring step for measuring the current of the electric wire connected to the main breaker and a branch current measuring for measuring the electric current of the electric wire connected to the branch breaker branched from the main breaker. And a power calculation step of calculating a total amount of power consumption based on the measured values of the main current sensor and the branch current sensor, the power calculation step allows designating a branch breaker not included in the main trunk, and After the setting step of setting the voltage of the branch breaker, the measurement value of the main current sensor, the voltage setting of the branch breaker designated as not included in the main trunk by the setting means, and the branch current connected to the branch breaker. It is characterized in that the total power consumption is calculated based on the measured value of the sensor.

According to the present invention, even if various load devices or load devices having different voltages are connected to the main trunk, it is possible to measure the total power consumption with high accuracy.

It is a schematic block diagram of the electric power measurement apparatus which concerns on this invention. It is a schematic block diagram of the electric power measurement apparatus which concerns on embodiment of this invention. It is a block diagram which shows the concrete structure of a power calculation part. It is a figure which shows concretely the content of an instruction set to a setting means. It is a flowchart which shows the control content of an electric power calculation part.

A power measuring device 100 according to the present invention will be described with reference to FIG.
The power measuring device 100 includes a main current sensor 1, a branch current sensor 2, and a power calculation unit 3 as main components.

The main current sensor 1 is provided on the main electric wire La, which is the main electric wire having the main breaker 4, and measures the current flowing through the main electric wire La.
The branch current sensor 2 is provided on the branch electric wire Lb that branches from the main electric wire La and has the branch breaker 5 on the way, and measures the current flowing through the branch electric wire Lb. The load device 6 is appropriately connected to the branch electric wire Lb branched from the main electric wire La.

The power calculation unit 3 has a setting unit 7 that can specify the branch breaker 5 in the area M that is not included in the main trunk and that sets the voltage of the branch breaker 5. Further, in the power calculation unit 3, the voltage setting of the branch breaker 5 designated by the setting means 7 as not included in the main trunk together with the measurement value of the main current sensor 1 and the branch current sensor 2 connected to the branch breaker 5 are set. Calculate the total power consumption based on the measured value of.

Then, in the power measuring device 100 configured as described above, in the power calculating unit 3, the voltage setting of the branch breaker 5 which is designated by the setting unit 7 as not included in the main trunk together with the measurement value of the main current sensor 1 and Based on the measurement value of the branch current sensor 2 connected to it, the total power consumption can be calculated.
As a result, in the power measuring apparatus 100, even when various load devices 6 and load devices 6 having different voltages are connected in a complicated manner to the main trunk, it is possible to measure the overall power consumption with high accuracy. ..

(Embodiment)
The power measuring apparatus 101 according to the embodiment of the present invention will be described with reference to FIGS.
This power measuring device 101 has main current sensors 11 and 12, branch current sensors 13 to 15, and a power calculation unit 20 as main components.

The main current sensors 11 and 12 are provided on the L1 voltage line and the L2 voltage line, which are main trunks having the main breaker 21 in the middle, and measure the currents flowing through the L1 voltage line and the L2 voltage line.
The main electric wire 50 is a single-phase three-wire type, and is provided with two L1 voltage lines and two L2 voltage lines with a voltage difference of 100 V via the center middle line C. Electric power is supplied to the electric wire 50 from a commercial power plant 51. In addition, the directions of the currents flowing through the L1 voltage line and the L2 voltage line are indicated by the symbols Is1 and Is2.

The branch current sensors 13 to 15 are respectively provided on the branch voltage line LB branched from the L1 voltage line and the L2 voltage line passing through the lead-in port 52, and measure the currents flowing through these branch voltage lines LB. Further, the branch voltage lines LB branched from the L1 voltage line and the L2 voltage line are respectively provided with branch current sensors 13 to 15 and branch breakers 22 to 24.

Note that among these, the branch current sensor 13 measures the current of the branch voltage line LB that has passed through the branch breaker 22 located in the preceding stage of the main breaker 21. Further, the branch current sensors 14 and 15 measure the currents of the branch voltage lines LB that have passed through the branch breakers 23 and 24 located at the subsequent stage of the main breaker 21, respectively.

Further, load devices 16 and 17 that can be driven by the current supplied via the branch voltage line LB are appropriately connected to the branch voltage line LB branched from the L1 voltage line and the L2 voltage line.
In the load device 16 shown in FIG. 2, the voltage of 200 V is applied by connecting the branch voltage line LB to the L1 voltage line and the L2 voltage line. Further, in the load device 17, the branch voltage line LB is connected to the L1 voltage line and the center line C, so that a voltage of 100 V is applied.

The electric power calculation unit 20 is operated by, for example, an electric power manager to enable designation of the branch breakers 22 to 24 from among a plurality of power breakers, and to which the setting means 25 for setting the voltage at each branch breaker 22 to 24 at the time of calculation is connected. ing.
The setting means 25 is composed of, for example, a personal computer, and for example, as shown in FIG. 4, sets the voltage to the branch breakers 22 to 24 and includes/does not include the branch breakers 22 to 24 in the main breaker 21. It is possible.
Further, in this setting means 25, when the voltage setting to the branch breakers 22 to 24 is 100V, the voltage coefficient is "1", and when the voltage setting to the branch breakers 22 to 24 is 200V, the voltage coefficient is "2". I am trying.

On the other hand, in the power calculation unit 20, the voltage values of the branch breakers 22 to 24, which are not included in the main trunk, which are appropriately selected by the setting means 25, are connected to the branch breakers 22 to 24 together with the measurement values of the main current sensors 11 and 12. The total power consumption is calculated based on the measured values of the branched current sensors 13 to 15.
As a specific configuration of the power calculation unit 20. As shown in FIG. 3, it has a control unit 30, storage units 31 and 32 connected to the control unit 30, and a communication unit 33.
The storage unit 31 stores selection information as to whether or not the branch breakers 22 to 24 set by the setting means 25 are included in the main breaker 21, information about voltage setting to the branch breakers 22 to 24, and the like. Further, the storage unit 32 stores a program for executing the control unit 30 (for example, the control flowchart of FIG. 5) and the like. A nonvolatile memory is used as the storage units 31 and 32.
The communication unit 33 has a function of fetching the setting of the branch breaker configuration information from the setting unit 25 by communication and transmitting the measured power and power amount to a display unit (not shown) of the setting unit 25.

The control unit 30 is also provided with a power calculation unit 40 including a main power calculation unit 34, a branch power calculation unit 35, a total used power calculation unit 36, and a power amount calculation unit 37.
The main power calculation unit 34 calculates the main power amount based on the measured values of the main current sensors 11 and 12 that measure the currents flowing in the L1 voltage line and the L2 voltage line.
The branch power calculation unit 35 calculates the branch power amount based on the measured values of the branch current sensors 13 to 15 not included in the main trunk. The branch power calculation unit 35 multiplies the measured values of the branch current sensors 13 to 15 by the voltage coefficient provided based on the voltage setting of the branch breaker configuration information recorded in the storage unit 31 to obtain the branch breaker. The electric power of 22 to 24 is calculated.

The total used power calculation unit 36 calculates the total amount of power calculated by the main power calculation unit 34 and the branch power calculation unit 35. In particular, the calculation unit 36 calculates the total power consumption value P(n) based on the current of the main breaker 21 and the branch breakers 22 to 24 not included in the main breaker 21 based on the setting content of the setting unit 25. ..
The power amount calculation unit 37 calculates the total purchased power amount (WHb) from a value obtained by dividing the total used power integrated value (Pb) by the number of times of power measurement (N).

Next, a flowchart showing the control contents of the power calculation unit 20 will be described for each step S with reference to FIG. In this flowchart, the total power consumption of the customer is calculated based on whether or not the branch breakers 22 to 24 are included in the main breaker 21.

[Step S1]
First, in step S1, "n" and "m" are reset to 0.
Here, n represents the number of times of power measurement per hour (n=1, 2, 3,... N), and m represents the number of the branch breakers 22 to 24 (m=1, 2, 3, 3) to be measured. ... M) is shown.

[Step S2]
“N” indicating the number of times of passing through step S2 is incremented by one.

[Step S3]
In step S3, along with the voltage between the L1 voltage line and the middle line C shown in FIG. 2, the currents of the L1 voltage line and L2 voltage line of the main breaker 21 and the current values of the branch breakers 22 to 24 are measured.

[Step S4]
The power value Ps(n) of the main breaker 21 is calculated from the average value of the products of the sum of the current values of the current sensors (11, 12) and the voltage between the L1 voltage line and the middle line C. The calculation process of step S4 is executed by the main power calculation unit 34 shown in FIG.

In the next steps S5 to S8, the calculation process of the branch power calculation unit 35 of FIG. 3 will be described.
[Step S5]
In step S5, 1 is added to the number variable m of the branch breakers 22 to 24 to be measured.

[Step S6]
In step S6, it is determined whether the branch breakers 22 to 24 are 100 V or 200 V based on the voltage setting of the branch breaker configuration information of FIG. 4, and the voltage coefficient of the branch breakers 22 to 24 is determined.

[Step S7-1]
In step S7-1, when the voltage of the branch breakers 22 to 24 is 100 V, the average value of the products of “the voltage of the L1 voltage line”, “the voltage coefficient of the branch breakers 22 to 24=1”, and “the branch current”. The branch power value Pbu(n) is calculated from the absolute value of

[Step S7-2]
In step S7-2, when the voltage of the branch breakers 22 to 24 is 200 V, the average value of the products of “the voltage of the L1 voltage line”, “the voltage coefficient of the branch breakers 22 to 24=2”, and “the branch current”. The branch power value Pbu(n) is calculated from the absolute value of

[Step S8]
In step S8, steps S5 to S8 are repeated until the number variable m of the branch breakers 22 to 24 to be measured reaches the specific breaker number (M) set in the branch breakers 22 to 24.

The calculation process of the total power consumption calculating unit 36 will be described with reference to steps S9 to S10.
[Step S9]
In step S9, the presence/absence of branch breakers 22 to 24 not included in the main breaker 21 is determined based on the setting of the branch breaker configuration information of FIG. 4 stored in the storage unit 31 of FIG.

[Step S10-1]
In step S10-1, if there are branch breakers 22 to 24 not included in the main breaker 21, total use is performed from the sum of the main power value Ps(n) and the power values Pbu(n) of the branch breakers 22 to 24 not included in the main. The power value P(n) is calculated.

[Step S10-2]
In step S10-2, if there is no branch breaker 22 to 24 that is not included in the main breaker 21, the main power value Ps(n) is set as the total used power value P(n).

The calculation process of the power amount calculation unit 37 will be described with reference to steps S11 to S13.
[Step S11] to [Step S12]
In steps S11 and S12, the total used power integrated value Pb is calculated by integrating the total used power value P(n) until the number of times of power measurement N per hour is reached.

[Step S13]
In step S13, the total purchased power amount WHb is calculated from the quotient obtained by dividing the total used power integrated value Pb by the power measurement number N, and then the present flowchart is ended.

Then, in the power measuring apparatus 101 configured as described above, in the power calculation unit 20, the branch values designated by the setting unit 25 from the plurality of values are specified together with the measured values of the main current sensors 11 and 12 by the setting unit 25. Based on the voltage settings of the breakers 22-24 and the measured values of the branch current sensors 13-15 connected to the breakers 22-24, the total power consumption can be calculated.
As a result, the power measuring apparatus 101 can measure the overall power consumption with high accuracy even when various load devices or load devices having different voltages are connected to the main in a complicated manner.

Specifically, the first effect of the present invention has a function of setting, in the branch breaker configuration information, whether or not each branch breaker is included in the main trunk before performing power measurement. Therefore, it is possible to reflect the electric power of the branch breaker not included in the main breaker 21 in the total electric power used by the customer and the total electric power purchase amount in the indoor power measuring device.
The second effect is that before measuring the electric power, the voltage of each branch breaker is set to 100 V or 200 V in the branch breaker configuration information, and the measured power value of the branch breaker is set to the voltage coefficient according to the voltage setting of the branch breaker. Therefore, the power of each branch breaker can be calculated even if the voltage is different from the voltage measured by the power measuring device.
The third effect is that the power value of the branch breaker is calculated by multiplying it by the voltage coefficient according to the voltage setting. Therefore, the power is supplied from the 100V commercial outlet in the vicinity where the power measuring device is installed, and the single-phase three-wire commercial It is also possible to measure electric power at the power supply.

Although the embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and includes design changes and the like within a range not departing from the gist of the present invention.

The present invention relates to a power measuring device and a power measuring method capable of easily measuring the total power used based on the current of a main breaker and the current of a branch breaker not included in the main.

1 main current sensor 2 branch current sensor 3 power calculation unit 4 main breaker 5 branch breaker 6 load device 7 setting means 11 main current sensor 12 main current sensor 13 branch current sensor 14 branch current sensor 15 branch current sensor 20 power calculation unit 21 main trunk Breaker 22 Branch breaker 23 Branch breaker 24 Branch breaker 25 Setting means 50 Electric wire 100 Electric power measuring device 101 Electric power measuring device Main electric wire La
Branch wire Lb
Branch wire LB

Claims (5)

A main current sensor that measures the current of the electric wire connected to the main breaker,
A branch current sensor that measures the current of the electric wire connected to the branch breaker branched from the main trunk,
And a power calculator that calculates the total amount of power used based on the measured values of the main current sensor and the branch current sensor,
The power calculation unit has a setting unit capable of designating a branch breaker not included in the main trunk and setting a voltage of the branch breaker, and is not included in the main trunk by the setting unit together with the measurement value of the main current sensor. The total power consumption is calculated based on the voltage setting of the branch breaker designated as and the measurement value of the branch current sensor connected to the branch breaker. In the power calculation unit, based on the voltage coefficient provided corresponding to the voltage setting of the branch breaker, to calculate the total power used based on the current of the main breaker, and the current of the branch breaker not included in the main The power measuring device according to claim 1, wherein the power measuring device is a power measuring device. The power calculation unit calculates a total amount of power used based on a preset breaker current and a branch breaker current not included in the trunk, based on a preset number of measurements per unit time. The power measuring device according to any one of 1 or 2. In the power calculation unit, based on the branch breaker number selected as a branch breaker not included in the main trunk, the total power consumption based on the current of the main breaker and the current of the branch breaker not included in the main trunk is calculated, The power measuring device according to any one of claims 1 to 3. A main current measurement stage that measures the current of the electric wire connected to the main breaker,
A branch current measurement stage that measures the current of the electric wire connected to the branch breaker branched from the main trunk,
And a power calculation step of calculating the total amount of power used based on the measured values of the main current sensor and the branch current sensor,
In the power calculation step, a branch breaker that is not included in the main trunk can be designated, and a voltage setting of the branch breaker is performed, and a measurement value of the main current sensor together with the measurement value of the main current sensor is not included in the main trunk. A method of measuring electric power, characterized in that the total amount of electric power used is calculated based on a voltage setting of a designated branch breaker and a measurement value of a branch current sensor connected to the branch breaker.

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