JP6198679B2 - Multi-circuit power measuring device - Google Patents

Description

  The present invention is a multi-circuit power measuring device that measures the power and the amount of power flowing in a wire to be measured such as a distribution line, the measurement of a plurality of circuits of different voltage systems (hereinafter referred to as “different systems”), and the same voltage system. The present invention relates to a multi-circuit power measuring apparatus capable of measuring a plurality of circuits (hereinafter referred to as “same system”).

  A conventional multi-circuit power measuring device has been proposed that can additionally change the scale of the device according to the number of circuits. Among such devices, there are a device that measures a plurality of circuits with different system voltages and a device that measures a plurality of circuits with the same system voltages.

  Patent Document 1 is a device that performs power measurement on a plurality of circuits having different system voltages, and uses the power of the load device based on the current signal flowing through the load device detected by the current transformer and the voltage signal supplied from the distribution feeder. It is composed of a plurality of measurement units each having a power calculation unit that calculates the amount, and a main unit that collects data of the measurement units (see, for example, Patent Document 1).

  Patent Document 2 is a device that measures a plurality of circuits of the same system voltage, a main device including a voltage conversion circuit for measuring the voltage of the wiring, and a current signal that is installed in each circuit and is measured by itself. And an individual measuring device provided with a power calculation circuit that calculates power from a voltage signal sent from the voltage conversion circuit of the main device (see, for example, Patent Document 2).

JP 2004-85413 A JP 2003-222645 A

Here, consider a device that realizes power measurement of both different systems and voltages of the same system.
First, when measuring the same system with a device capable of measuring a voltage of a different system, it can be realized by wiring across the voltage line outside the apparatus, but the wiring becomes complicated.
On the other hand, an apparatus that measures a plurality of circuits with the same system voltage cannot measure the power of different systems with different voltages in the first place.

  The object of the present invention is to measure the power and energy of voltage circuits of the same system and different systems with one multi-circuit power measuring device, and no external crossover wiring is required for voltage measurement of the same system. It is providing the multicircuit electric power measuring apparatus which is.

  The multi-circuit power measuring device according to the present invention comprises a plurality of power measuring units, and the plurality of power measuring units perform power measurement of multi-circuits with voltages of different systems and power measurement of multi-circuits with voltages of the same system, It is a multi-circuit power measurement device that can perform the measurement based on the voltage and current of the wiring to be measured, and display the result of each power measurement, and each of the plurality of power measurement units performs the power measurement. A voltage input unit that inputs a voltage applied to the wiring, a current input unit that inputs a current flowing through the wiring, a calculation unit that calculates power and electric energy based on the voltage and current, and a communication connection unit, A power measurement unit other than one of the plurality of power measurement units can selectively switch between performing the calculation using the voltage of the different system or performing the calculation using the voltage of the same system. When the voltage selection unit has an input selection unit and the voltage input selection unit selects the calculation using the same system voltage, the voltage signal passes the voltage calculation result of the power measurement unit on the voltage signal passing side. So that the voltage calculation result of the power measurement unit passing the voltage signal matches the voltage calculation result of the power measurement unit passing the voltage signal. The calculation of the power measurement unit on the side to which the voltage signal is passed is automatically adjusted.

  The multi-circuit power measuring device according to the present invention includes a plurality of power measuring units, and the plurality of power measuring units perform power measurement of multi-circuits with voltages of different systems and power measurement of multi-circuits with voltages of the same system. Is a multi-circuit power measurement device that displays the result of each of the power measurements, and each of the plurality of power measurement units performs the power measurement. A voltage input unit that inputs a voltage applied to the wiring, a current input unit that inputs a current flowing through the wiring, a calculation unit that calculates electric power and electric energy based on the voltage and current, and a communication connection unit, A power measurement unit other than one of the power measurement units of the power supply unit selectively switches between performing the calculation using the voltage of the different system or performing the calculation using the voltage of the same system. When the voltage selection unit has an input selection unit and the voltage input selection unit selects the calculation using the same system voltage, the voltage signal passes the voltage calculation result of the power measurement unit on the voltage signal passing side. So that the voltage calculation result of the power measurement unit passing the voltage signal matches the voltage calculation result of the power measurement unit passing the voltage signal. Since the calculation of the power measurement unit on the side to which the voltage signal is passed is automatically adjusted, it is possible to measure the power and energy of voltage circuits of the same system and different systems with one multi-circuit power measurement device. It is possible to provide a multi-circuit power measuring device that does not require external wiring of voltage wiring when measuring the voltage of the system.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows Embodiment 1 of this invention, and is a circuit block diagram which shows an example at the time of making the connection measured using a different system | strain voltage in an example of a multicircuit electric power measurement apparatus. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows Embodiment 1 of this invention, and is a circuit block diagram which shows an example at the time of making the connection measured using the same system voltage in an example of a multi-circuit electric power measurement apparatus. It is a figure for demonstrating adjustment of the electric power and electric energy in Embodiment 1 of this invention, and is a sequence diagram which illustrates the adjustment sequence of electric power and electric energy. FIG. 5 is a diagram illustrating the first embodiment of the present invention, and is a sequence diagram illustrating an operation sequence when a subunit is set to use a voltage signal of a main unit for calculation in an example of a multi-circuit power measurement device. FIG. 5 is a diagram illustrating the first embodiment of the present invention, and is a sequence diagram illustrating an operation sequence when the subunit is set to use the voltage signal of the own power measurement unit for calculation in an example of the multi-circuit power measurement device. . It is a figure which shows Embodiment 2 of this invention, and is a circuit block diagram which shows the other example of a multicircuit electric power measuring apparatus. It is a figure which shows Embodiment 2 of this invention, and is a sequence diagram which illustrates the sequence of a setting and adjustment at the time of selecting the voltage of the electric power measurement unit of a front | former stage.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to FIGS. FIG. 1 is a circuit configuration diagram illustrating an example of a case where wiring is performed using a different system voltage in an example of a multi-circuit power measurement apparatus, and FIG. 2 is a measurement using the same system voltage in an example of a multi-circuit power measurement apparatus. It is a circuit block diagram which shows an example at the time of connecting. In the connection system of the multi-circuit power measuring device illustrated in FIG. 1, the power and power of a plurality of different system circuits of different system voltage wirings 2a, 2b, and 2c (hereinafter also referred to as a representative number “2”) may be used. The power amount is measured, and is constituted by a main power measurement unit (hereinafter referred to as “main unit”) 1 a and sub power measurement units (hereinafter referred to as “sub units”) 1 b and 1 c.

Further, in the connection system of the multi-circuit power measuring device illustrated in FIG. 2, the power / power of a plurality of circuits 20a, 20b, and 20c (hereinafter also referred to as a representative number “20”) that are the same system voltage wiring. Measure the amount.
Here, for example, different system voltage wire 2a is different AC1 1 0V, the voltage of each wire different system voltage wiring 2b is AC2 1 0V, different system voltage wiring 2c is the AC 44 0V such multicircuit power measurement device is connected, The same system voltage wirings 20a, 20b, 20c are all the same, for example, AC 110V.
The number of subunits in the example of the first embodiment is a two but one, it is also possible to configure three or more.

  First, FIG. 1 will be described in detail. The main unit 1a inputs a voltage applied to the wiring 2a, converts the voltage flowing through the wiring into a voltage input unit 4a that converts the voltage signal into a low voltage signal, and converts the current flowing through the wiring into a voltage using the current transformers 3a and 3b. A current input unit 5a for converting to a low-voltage current signal, a voltage signal passing unit 7a for passing a voltage signal output from the voltage input unit 4a to the subunit 1b, and a voltage signal and current input as an output of the voltage input unit 4a An AD conversion / measurement calculation unit 6a for calculating electric power and electric energy by converting them from an analog value to a digital value from a current signal which is an output signal of the unit 5a, each subunit 1b, 1c, and an external setting device 10a Communication connection units 9a and 9b for communication, and a display / operation unit 11a capable of displaying calculation results in the AD conversion / measurement calculation unit 6a and switching display contents are provided. The voltage input unit 4a and the voltage signal transfer unit 7a are connected by a voltage transfer line 47a in the main unit 1a, and the communication connection units 9a and 9b are connected by a communication signal transmission line 9ab in the main unit 1a.

The subunit 1b receives a voltage applied to the wiring 2b and converts it into a voltage input unit 4b that converts it into a low voltage signal, and converts the current flowing through the wiring 2b with current transformers 3c and 3d, and converts the converted signal into a current signal. A current input unit 5b for conversion, a voltage signal passing unit 7a for passing the voltage from the main unit 1a, a voltage signal passing unit 7b for passing the voltage to the subsequent subunit 1c, a voltage signal of the main unit 1a and the subunit 1b The voltage input selection unit 8a for selecting which voltage signal to use (the voltage signal selection unit 8a selects the voltage signal of the subunit 1b in FIG. 1) and the voltage that is the output of the voltage input unit 4b An AD conversion / measurement calculation unit 6b that calculates power and electric energy by converting the analog value into a digital value from the signal and the current signal that is the output signal of the current input unit 5b; A storage unit 12a for storing a necessary voltage calculation ratio (details will be described later), and communication connection units 9b and 9c for communicating with the front main unit 1a, the rear subunit 1c, and the external setting device 10a; It has. The voltage signal transfer units 7a and 7b are connected by a voltage transfer line 7ab in the subunit 1b, and the communication connection units 9ab and 9bc are connected by a communication signal transmission line 9bc in the subunit 1b.
The subunit 1c has the same configuration and function as the aforementioned subunit 1b. The voltage signal transfer sections 7b and 7c are connected by a voltage transfer line 7bc in the subunit 1c, and the communication connection sections 9c and 9d are connected by a communication signal transmission line 9cd in the subunit 1c.

Next, FIG. 2 will be described. 2 differs from FIG. 1 in that the subunit 1b selects the voltage signal of the main unit 1a. Accordingly, in FIG. 2, the AD conversion / measurement calculation unit 6b of the subunit 1b has the voltage signal of the main unit 1a (output signal of the voltage input unit 4a) and the current signal of the subunit 1b (output signal of the current input unit 5b). ) And the voltage calculation ratio of the storage unit 12a.
Similarly to the subunit 1b, the AD conversion / measurement calculation unit 6c of the subunit 1c also receives the voltage signal of the main unit 1a (output signal of the voltage input unit 4a) and the current signal of the subunit 1c (subunit 1c). The output signal of the current input unit 5c) and the voltage calculation ratio of the storage unit 12b are input.

Next, the operation of the multi-circuit power measuring apparatus according to the first embodiment configured as described above will be described.
First, in FIG. 1, the voltage applied to the wiring 2a is input to the voltage input unit 4a of the main unit 1a and converted into a voltage signal. Further, the current flowing through the wiring 2a is converted into signals by the current transformers 3a and 3b, and the converted signal is converted into a current signal by the current input unit 5a. Then, the AD conversion / measurement calculation unit 6a calculates the electric power and the electric energy based on the voltage signal (output signal of the voltage input unit 4a) and the current signal (output signal of the current input unit 5a). The power / power amount obtained by the AD conversion / measurement calculation unit 6a is transmitted to the display / operation unit 11a through the transmission line of the communication signal, and the measured value of the power / power amount is displayed on the display unit of the display / operation unit 11a. Is displayed.
For the subunit 1b and subunit 1c, in addition to the voltage signal and current signal processed in the same manner as the main unit, AD conversion is performed based on the voltage calculation ratio of the storage unit 12 (12 is a representative number of 12a and 12b). / Measurement calculation units 6b and 6c calculate the power / power amount, the calculation results are transmitted to the display / operation unit 11a, and the measured values of the power / power amount are displayed on the display unit of the display / operation unit 11a. Is done.

Next, FIG. 2 will be described. 2 differs from FIG. 1 in that the subunit 1b selects the voltage signal of the main unit 1a. Accordingly, in FIG. 2, the voltage of the wiring 20a passes through the voltage input unit 4a and the voltage signal passing unit 7a. Therefore, the AD conversion / measurement calculation unit 6b receives the voltage signal of the main unit 1a and the current signal (wiring 20b) of the subunit 1b. The output signal of the current input unit 5b input from the input unit) is input, and the power and the electric energy are calculated from the input voltage signal, current signal, and the voltage calculation ratio of the storage unit 12a.
Similarly to the subunit 1b, since the voltage of the wiring 20a passes through the voltage input unit 4a and the voltage signal passing units 7a and 7b, the AD conversion / measurement calculation unit 6c also transmits the voltage signal of the main unit 1a to the subunit 1c. The current signal of the subunit 1c (the output signal of the current input unit 5c input from the wiring 20c) is input, and the electric power and the electric energy are calculated from the input voltage signal, the current signal, and the voltage calculation ratio of the storage unit 12b. To do.

Next, the adjustment of electric power and electric energy will be described. Since the characteristics of the measurement circuit are different for each apparatus, the power and the electric energy can be measured with high accuracy by adjusting the measurement calculation.
First, at the time of shipment of the multi-circuit power measuring device, the power / power amount is adjusted with the configuration shown in FIG. FIG. 3 shows a sequence diagram for adjusting the power and the electric energy. In the adjustment procedure at the time of shipment, first, the power measuring device that is a reference that has been adjusted accurately and the multi-circuit power measuring device of the present invention before the adjustment are connected so as to measure the power of the same wiring. Then, voltage and current are input to the wiring, and the adjustment operator reads the power, electric energy, and power factor at that time from each power measuring device using an external setting device, and the multi-circuit power measuring device of the present invention product The multi-circuit power measuring device of the present invention is adjusted and set so that the measured value becomes the same as the measured value of the adjusted power measuring device.

  Here, in the first embodiment, the measurement circuit is different between the case where the subunits 1b and 1c use their own measurement voltage and the case where the measurement voltage of the main unit 1a is used. In addition to the adjustment in the configuration, it is necessary to make the same adjustment for the circuit configuration of the connection method of FIG. 2, but at the time of shipment, the adjustment of the connection method of FIG. When the adjustment is made in the circuit configuration, two problems arise. One problem is that it takes twice as much adjustment time, and the other problem is that the main unit and the subunit are adjusted in combination, so that it is not possible to add a new subunit on site after shipment. is there.

  Therefore, in the first embodiment, the multi-circuit power measurement device itself automatically performs the adjustment in FIG. When the voltage of the main unit 1a is set by the external setting device 10a, the voltage calculation result of the main unit 1a is passed to each subunit through the communication connections 9a, 9b, 9c, and each subunit 1b, 1c Automatic adjustment is performed so that the voltage calculation result of the self-power measuring unit matches the voltage calculation result of 1a.

This automatic adjustment refers to a process of calculating a voltage calculation ratio, and the voltage calculation ratio can be obtained by “voltage calculation result of main unit ÷ voltage calculation result of own power measurement unit”. A voltage calculation result obtained by “voltage calculation ratio × voltage calculation result of own power measurement unit” is used as a voltage used when calculating power and electric energy based on voltage and current.
This automatic adjustment is a process corresponding to a change in the amplitude of the voltage input to the AD conversion / measurement calculation unit 6 by switching the voltage signal selection unit 8 (8 is a representative number of 8a and 8b). By using a voltage signal measuring circuit whose phase shift does not affect the calculation result, switching can be handled only by adjusting the voltage amplitude.

  FIG. 4 is a sequence diagram illustrating an operation sequence when the subunits 1b and 1c are set to use the voltage signal of the main unit 1a for calculation. As shown in FIG. 4, first, the setting for selecting the voltage signal of the main unit 1a is transmitted from the external setting device 10a. After the main unit 1a receives the signal, the voltage calculation result of the main unit 1a is sent to the subunits 1b and 1c. Send. Then, the subunits 1b and 1c are switched so that the voltage signal selectors 8a and 8b select the voltage input signal of the main unit. From the received voltage calculation result of the main unit 1a and the voltage calculation result of the own power measurement unit, the subunits 1b and 1c are switched. Is calculated, and the voltage calculation ratio is stored in the storage units 12a and 12b. Thereafter, the power is calculated using this voltage calculation ratio until the voltage signal of the self-power measuring unit is set to be used for the calculation.

  FIG. 5 is a sequence diagram illustrating an operation sequence when the subunits 1b and 1c are set to use the voltage signal of the own power measurement unit for calculation. As shown in FIG. 5, first, a setting signal for selecting the voltage signal of the self-power measuring unit is transmitted from the external setting device 10a to the subunits 1b and 1c via the communication connections 9a, 9b and 9c, and the subunit 1b, After the signal is received by 1c, the voltage calculation ratio is stored in the storage units 12a and 12b with the voltage calculation ratio of the subunits 1b and 1c set to 1. By setting the voltage calculation ratio to 1, the adjusted result is applied to the circuit configuration of the connection system of FIG. Thereafter, power is calculated using this voltage calculation ratio until the voltage signal of the main unit is set to be used for the calculation.

  As described above, according to the multi-circuit power measuring apparatus according to the first embodiment, it is possible to measure the voltage of both the subunit and the main unit using the same apparatus, and the apparatus when the voltage of the main unit is used. Since external crossover wiring can be omitted, it is possible to reduce mistakes in connection of crossover wiring outside the device and to improve the efficiency of the wiring work. In addition, by automatically adjusting when using the voltage of the main unit, the adjustment at the time of shipment can be unified with the multi-circuit power measurement device that does not have a voltage signal passing section outside the device, and a new sub unit is added after shipment. It is also possible to do.

Embodiment 2. FIG.
A second embodiment of the present invention will be described below with reference to FIGS. FIG. 6 is a circuit configuration diagram illustrating another example of the multi-circuit power measurement device, and FIG. 7 is a sequence diagram illustrating a setting / adjustment sequence when the voltage of the power measurement unit in the previous stage is selected.
In the second embodiment, the difference from the first embodiment is that, in the second embodiment, in addition to the voltage of the self-power measurement unit, not only the voltage signal of the main unit 1a is selected, but one before the self-power measurement unit. The voltage signal of the power measurement unit (hereinafter referred to as the “previous power measurement unit”) can be selected. Here, the power measurement unit in the previous stage corresponds to the main unit 1a in the subunit 1b and the subunit 1b in the subunit 1c, and is a unit shown on the upper side in FIG.
In the main unit 1a, the voltage input unit 4a and the voltage signal passing unit 7a are connected by a voltage passing line 47a in the main unit 1a so that the voltage signal of the power measuring unit immediately before the own power measuring unit can be selected. The communication connection portions 9a and 9b are connected by a communication signal transmission line 9ab in the main unit 1a. In the subunit 1b, the voltage signal passing portions 7a and 7b are connected to the voltage passing line 47b in the subunit 1b and The voltage signal selection unit 8a is connected, the communication connection units 9b and 9c are connected by a communication signal transmission line 9bc in the subunit 1b, and in the subunit 1c, the voltage signal passing units 7b and 7c are the voltage passing lines in the subunit 1c. 47c and the voltage signal selection unit 8b, and the communication connection units 9c and 9d are connected to the transmission line 9c of the communication signal in the subunit 1c. Is circuitry configured to be connected with.

In the above-described automatic adjustment according to the second embodiment, the voltage calculation of the power measurement unit at the preceding stage is performed in the subunit (hereinafter referred to as “the power measurement unit at the subsequent stage”) that is set to use the voltage of the power measurement unit at the previous stage. Automatic adjustment is performed so that the result and the voltage calculation result of the subsequent power measurement unit match.
In this automatic adjustment, “voltage calculation result of power measurement unit in the previous stage ÷ voltage calculation result of power measurement unit in the subsequent stage” is obtained as the voltage calculation ratio. Then, when calculating the power / power amount, the voltage calculation result obtained by “voltage calculation ratio × voltage calculation result of the power measurement unit at the subsequent stage” is used as the power / power based on the voltage and current as in the first embodiment. Used as the voltage used when calculating the quantity.

As shown in FIG. 7 which is a sequence diagram of setting / adjustment when the voltage of the power measurement unit in the previous stage is selected, first, a signal for setting to select the voltage signal of the power measurement unit in the previous stage is transmitted from the external setting device 10a to the communication connection unit. After transmitting through 9a, 9b, and 9c, and the power measurement unit in the previous stage receives the signal, the voltage calculation result of the power measurement unit in the previous stage is transmitted to the power measurement unit in the subsequent stage. Then, the voltage signal selection unit 8 of the subsequent power measurement unit switches so as to select the voltage input signal of the previous power measurement unit, and the latter power measurement unit is based on the received voltage calculation result of the previous power measurement unit. And the voltage calculation ratio is stored in the storage unit 12. Thereafter, the power is calculated using this voltage calculation ratio until the voltage signal of the self-power measuring unit is set to be used for the calculation.
When the voltage signal of the own power measurement unit is selected, the voltage calculation ratio of the unit is stored as 1 in the storage unit 12 as in the first embodiment. Adjustment is applied.

  As described above, according to the multi-circuit power measurement device according to the second embodiment, the crossover wiring outside the device can be omitted in the scene where the voltage of another power measurement unit is used in addition to the self-power measurement unit. It is also possible to add a new power measurement unit.

Embodiments 1 and 2 described above have the following features as described above.
Feature A1: A multi-circuit power measuring apparatus capable of multi-circuit measurement of different system voltage and multi-circuit measurement of the same system voltage, which is composed of a plurality of units, and voltage input for inputting the voltage applied to the wiring to each unit Unit, a current input unit for inputting a current flowing in the wiring, an AD conversion / measurement calculation unit for calculating electric power and electric energy, a communication connection unit for communicating with the units, the display / operation unit, and the external setting device. The main unit has a display / operation unit that can display the calculation results and switch the display contents, and the sub-unit uses a different system voltage or the same system voltage to calculate power and energy It is a multi-circuit power measuring device provided with the voltage input selection part which switches whether to perform, and the memory | storage part which memorize | stores a voltage calculation ratio.
Feature A2: A multi-circuit power measuring device that adjusts power / electric energy measurement for voltages and currents input from circuits of different systems at the time of shipment, and automatically adjusts when the voltage of the same system is applied.
Feature A3: When measuring the voltage of the same system, the voltage calculation result of the unit that passes the voltage signal through the communication connection unit is transmitted to the unit that is passed, and the voltage calculation result of the unit that passes the voltage signal is This is a multi-circuit power measuring device capable of adjusting the power and the electric energy by automatically adjusting the voltage calculation results of the units on the handing side to match.
Feature A4: As a multi-circuit power measuring device, a unit type device composed of a main unit and a plurality of subunits is considered. When measuring a different system voltage, the unit is connected to a voltage signal input terminal of each unit, and when measuring the same system voltage, an internal circuit is switched to pass a voltage signal between the units.
Feature A5: It is possible to measure the power and electric energy of voltage circuits of the same system and different systems with the same measuring device, and it is possible to save wiring when measuring the voltage of the same system compared to measuring the voltage of the other system.
Feature A6: In a multi-circuit power measuring device that can measure the voltage of the same system even with a different system voltage with one unit, a multi-circuit power measuring device that does not require external wiring of the voltage wiring is obtained when measuring the voltage of the same system Therefore, in a unit-type device composed of a main unit and a plurality of subunits, a voltage signal passing unit 7a is provided between the units, and the output voltage of the voltage input unit 4a of the main unit passes through the voltage signal passing unit 7a. The voltage input selection unit 8a of the subunit 1b can perform power calculation by switching between the different system voltage and the same system voltage by switching the voltage to be used between the output of the voltage input unit 4b and the output of the voltage input unit 4a. This is a multi-circuit power measuring device that can be used.
Feature B1: It is composed of a plurality of power measurement units, and the plurality of power measurement units perform multi-circuit power measurement of different system voltage and multi-circuit power measurement of the same system voltage, and the voltage of the wiring where power measurement is performed A multi-circuit power measuring device that can be based on a current and displays each power measurement result, wherein each of the plurality of power measuring units inputs a voltage applied to a wiring on which the power measurement is performed. Other than one of the plurality of power measurement units, including an input unit, a current input unit that inputs current flowing through the wiring, a calculation unit that calculates power and electric energy based on voltage and current, and a communication connection unit The other power measurement unit has a voltage input selection unit that selectively switches between performing the calculation using the voltage of the different system or performing the calculation using the voltage of the same system, and the voltage When the calculation is performed by using a voltage of the same system by the force selection unit, the voltage calculation result of the power measurement unit on the voltage signal passing side is transmitted to the power measurement unit on the voltage signal passing side. The power on the side to which the voltage signal is passed so that the voltage calculation result of the power measurement unit on the side to which the voltage signal is passed and the voltage calculation result of the power measurement unit on the side to which the voltage signal is passed are transmitted through the connection unit A multi-circuit power measuring apparatus that automatically adjusts the calculation of a measuring unit.
Feature B2: In the multi-circuit power measurement device of Feature B1, the plurality of power measurement units adjust the power measurement based on voltages and currents input from the circuits of the different system voltage at the time of shipment, The power measurement unit to which the voltage signal is passed is a multi-circuit power measurement device that automatically adjusts the calculation when a voltage is applied from a multi-circuit of the same system voltage.
Feature B3: In the multi-circuit power measurement device of Feature B1 or Feature B2, the power measurement unit passing the voltage signal is a main power measurement unit having a function of displaying the power measurement result, and the voltage signal is The power measurement unit on the passing side is a sub power measuring unit that does not have a function of displaying the power measurement result, and the power measurement result of the power measuring unit on the side to which the voltage signal is passed is a communication connection unit. It is a multi-circuit power measuring device displayed via the main power measuring unit.
Feature B4: In the multi-circuit power measurement device of Feature B1 or Feature B2, the power measurement unit that passes the voltage signal and the power measurement unit that passes the voltage signal have a function of displaying the power measurement result. It is a multi-circuit power measuring device which is a sub power measuring unit that does not have.

In the present invention, the embodiments can be appropriately combined, modified, and omitted within the scope of the invention.
In addition, in each figure, the same code | symbol shows the same or an equivalent part.

1 power measurement unit, 1a main power measurement unit (main unit),
1b, 1c Sub power measurement unit (sub unit), 2 Different system voltage wiring,
3, 3a, 3b, 3c, 3d, 3e, 3f Current transformer,
4, 4a, 4b, 4c voltage input unit, 5, 5a, 5b, 5c current input unit,
6, 6a, 6b, 6c AD conversion / measurement calculation unit,
7, 7a, 7b, 7c voltage signal transfer unit, 8, 8a, 8b voltage input selection unit,
9, 9a, 9b, 9c communication connection part, 10a external setting device,
11a display / operation unit, 12, 12a, 12b storage unit,
20, 20a, 20b, 20c Same system voltage wiring,
9ab, 9bc, 9cd transmission lines in the unit,
47a, 7ab, 7bc, 47b, 47c Voltage transfer lines in the unit.

Claims (4)

Consists of a plurality of power measurement units, and the plurality of power measurement units perform multi-circuit power measurement of different system voltage and multi-circuit power measurement of the same system voltage to the voltage and current of the wiring where power measurement is performed. It is a multi-circuit power measurement device that can be based on and displays the result of each of the power measurements,
Each of the plurality of power measurement units includes a voltage input unit that inputs a voltage applied to the wiring on which the power measurement is performed, a current input unit that inputs a current flowing through the wiring, and a power and an electric energy based on the voltage and the current. And a communication connection unit,
Voltage that other power measurement units other than one of the plurality of power measurement units perform the calculation using the voltage of the different system or alternatively perform the calculation using the voltage of the same system. Has an input selector,
When the voltage input selection unit is selected to perform the calculation using the voltage of the same system, the voltage calculation result of the power measurement unit on the voltage signal passing side is transferred to the power measurement unit on the voltage signal passing side. The side to which the voltage signal is transmitted so that the voltage calculation result of the power measurement unit on the side to which the voltage signal is transmitted and the voltage measurement result of the power measurement unit to which the voltage signal is passed is transmitted through the communication connection unit A multi-circuit power measuring apparatus that automatically adjusts the calculation of the power measuring unit. The multi-circuit power measuring device according to claim 1,
The plurality of power measurement units are adjusted for the power measurement based on the voltage and current input from the circuit of the different system voltage at the time of shipment, respectively, and when the voltage is applied from the multiple circuits of the same system voltage The multi-circuit power measuring device, wherein the power measuring unit to which the voltage signal is passed automatically adjusts the calculation. In the multi-circuit power measuring device according to claim 1 or 2,
The power measurement unit on the side of passing the voltage signal is a main power measurement unit having a function of displaying a result of the power measurement,
The power measurement unit to which the voltage signal is passed is a sub power measurement unit that does not have a function of displaying the result of the power measurement,
The multi-circuit power measurement device, wherein the power measurement result of the power measurement unit to which the voltage signal is passed is displayed on the main power measurement unit via a communication connection unit. In the multi-circuit power measuring device according to claim 1 or 2,
The power measurement unit that passes the voltage signal and the power measurement unit that passes the voltage signal are sub-power measurement units that do not have a function of displaying the result of the power measurement. Circuit power measurement device.

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