JP6124055B2 - Power measurement system - Google Patents

Description

  The present invention relates to a power measurement system that measures the power of a circuit in a distribution board or the like using a current transformer (CT).

  Conventionally, when measuring the power of a circuit in a distribution board provided in a facility such as a house or a building, a current transformer is used to expand the measurement range. Generally, a power measuring instrument is connected to the receiving circuit of this current transformer, and this power measuring instrument inserts a burden resistor into the circuit connected to the current transformer, and the voltage across this burden resistor. By detecting the current value, the current value is measured to calculate the power.

  In the past, most of the power measurement of the circuit in the distribution panel has been to measure only the main circuit through which a large current flows. However, in order to realize “visualization” of power consumption in recent years, It is also necessary to measure the power of a plurality of branch circuits that are terminal circuits in the branched distribution board. In this branch circuit, a current of about several tens of A flows, for example, because the current from the main circuit is shunted. In the “visualization” of power, information on power for each branch circuit in the distribution board can be displayed on a monitoring device (personal computer) equipped with a monitor via a LAN.

  In the current measurement of the branch circuit, a small current transformer (small CT) having an output current of about several tens of mA is used instead of a comparatively large current transformer used conventionally. In this small CT, the iron core and the winding can be miniaturized. Therefore, the small CT can be used for current measurement of a branch circuit or the like having a relatively low current in the distribution board at a place where the conventional current transformer cannot be used due to shape restrictions. Thus, it is necessary to use different types of current transformers according to the installation space in the distribution board.

  By the way, a light emitting unit that emits light in response to a push operation of a push button provided on the connector is provided on one surface of the current transformer body, and the correspondence between the current transformer and the connector connected to the power meter is visually checked. The electric power measurement unit which confirms by this and aims at prevention of a misconnection is disclosed (for example, refer patent document 1). Also disclosed are a three-phase power measuring device, a three-phase power watt-hour meter, and a method for determining the connection state thereof, which can always obtain the correct power even if the coupling direction of the current transformer is arbitrary by the absolute value conversion means. (For example, refer to Patent Document 2).

JP 2011-33462 A JP 2001-124806 A

  However, in order to “visualize” the power as described above, when a plurality of (for example, 40) small CTs are attached to each of a plurality of branch circuits in the distribution board, the number of measurement circuits becomes very large. Construction such as circuit setting and current transformer installation becomes very complicated. As a result, it is assumed that an error in the mounting position of the current transformer or an error in the mounting direction of the current transformer occurs.

  And generally, in the test performed at the completion of construction of the distribution board, current is passed through loads such as lighting equipment and air conditioners connected to all branch circuits, and correctness determination of all measured power values is made. Never done. For this reason, even if the current transformer is attached by mistake, it is assumed that a failure appears in the power display only when the user actually uses the load. For example, when the current transformer is attached to the circuit in the reverse direction, “Current power consumption: −100 W” is displayed on the display screen of the monitoring device (such as a personal computer) even when the load is being used. The user will feel uncomfortable with the displayed power consumption.

  The present invention has been made in view of the above-described problems, and enables determination of an error in attaching a current transformer to a circuit such as a distribution board, and the power value erroneously displayed on a monitoring device or the like. It is an object of the present invention to provide an electric power measurement system that prevents a user from feeling uncomfortable.

In order to achieve the above object, the present invention provides a voltage detection unit that detects a voltage signal from a circuit, a current detection unit that detects a current signal based on an output from a current transformer attached to the circuit, A power calculator that calculates the power value of the circuit based on the voltage and current signals detected by the voltage detector and the current detector; and a display that displays a result based on the calculation of the power calculator; In a power measurement system comprising: a power value of a circuit that is calculated by the power calculation unit and in which one current transformer in a plurality of circuits is attached; and a power in a circuit to which another current transformer is attached in the plurality of circuits And a determination unit that determines that the one current transformer and the other current transformer are measuring the same circuit based on the value, and the determination unit is attached to the one current transformer. Average power value or integrated power The difference between the value and the average power value or integrated power value of the circuit to which the other current transformer is attached is within the predetermined range, and the same is true when the predetermined range is equal to or greater than the predetermined ratio. It is determined that the circuit is being measured.

The present invention also provides a voltage detection unit that detects a voltage signal from a circuit, a current detection unit that detects a current signal based on an output from a current transformer attached to the circuit, the voltage detection unit, A power measurement system comprising: a power calculation unit that calculates a power value of the circuit based on voltage and current signals detected by the current detection unit; and a display unit that displays a result based on the calculation of the power calculation unit. In the above, based on the power value of the circuit to which one current transformer in the plurality of circuits is attached and the power value of the circuit to which the other current transformer in the plurality of circuits is attached. , Including a determination unit that determines that the one current transformer and the other current transformer are measuring the same circuit, and the determination unit is an average of a circuit to which the one current transformer is attached. The power value or integrated power value is displayed on the time axis. The difference between the inverted value and the average power value or integrated power value of the circuit to which the other current transformer is attached is within a predetermined range, and the predetermined range or more is within the predetermined range. In this case, it may be determined that the same circuit is being measured .

  In this power measurement system, it is preferable that the difference within a predetermined range is a range within twice the accuracy of the current transformer attached to the circuit.

  In this power measurement system, it is preferable that the display unit further displays at least one of a determination result detected by the determination unit and a correspondence based on the determination result.

  In this power measurement system, it is preferable to further include a reporting unit that reports at least one of the detection result in the determination unit and the correspondence based on the determination result.

  In this power measurement system, the name of the circuit to which one current transformer is attached in the plurality of circuits displayed on the display unit is the same as or similar to the name of the circuit to which another current transformer is attached. It is preferable to further include a name detection unit for detecting this, and in the case where the name is the same or similar, it is preferable to perform a display for prompting the user to reset the name on the display unit.

  According to the power measurement system of the present invention, based on the power value of the circuit to which the current transformer is attached, it is determined that one current transformer and another current transformer are measuring the same circuit. . For this reason, in the present invention, it is possible to determine an error in attaching the current transformer to the circuit, and it is possible to reduce the user's uncomfortable feeling with respect to the power value erroneously displayed on the monitoring device or the like.

1 is an overall configuration diagram of a power measurement system according to Embodiment 1 of the present invention. It is a functional block diagram of the electric power measuring device and monitoring apparatus with which an electric power measurement system same as the above is provided. (A)-(c) It is a figure for demonstrating the determination algorithm of the determination calculating part with which a monitoring apparatus same as the above is equipped. It is a figure which shows an example of the display to the display part with which a monitoring apparatus same as the above is equipped. It is a whole block diagram of the electric power measurement system which concerns on the modification 1 of the said Embodiment 1. FIG. It is a figure for demonstrating the determination algorithm of the determination calculating part with which a monitoring apparatus same as the above is provided. (A) The figure which shows an example of the display of the display part with which the electric power measurement system which concerns on Embodiment 2 of this invention is equipped, (b) It is a flowchart which shows the operation | movement procedure of an electric power measurement system same as the above. It is a functional block diagram of the electric power measuring device and monitoring apparatus with which an electric power measurement system same as the above is provided. 1 is an overall configuration diagram of a power measurement system according to a reference example of the present invention. It is a figure which shows an example of the display of the display part with which an electric power measurement system same as the above is provided.

(Embodiment 1)
A power measurement system according to Embodiment 1 of the present invention will be described with reference to the drawings. As shown in FIG. 1, the power measurement system S includes a distribution board 1, a current transformer 2, a power meter 3, a monitoring device 4, a load 5, and breakers 6 a to 6 c. This power measurement system S monitors the power consumption of various loads 5 such as lighting equipment and personal computers that receive power supply from the distribution board 1 in, for example, ordinary houses and office buildings, and “visualizes” the power. Is realized.

  The distribution board 1 includes a main circuit that receives commercial power supplied from outside to the building or house via a single-phase three-wire type electric wire 7 and a main circuit that branches from the secondary side of the main circuit. And a plurality of branch circuits intervening. Each branch circuit is connected to various loads 5 such as an air conditioner and an IH device in addition to a lighting fixture and a personal computer. Moreover, the breaker 6a is a main breaker connected to the electric wire 7 of the main circuit, and the breaker 6b is a branch breaker disposed in a plurality of branch circuits branched from the main circuit.

  The current transformer 2 reduces the current of each circuit at a constant rate and supplies the current to the power meter 3 via the signal line 8 which is a dedicated cable. In the first embodiment, the current transformer 2 is installed to periodically measure the branch current flowing through each branch circuit through which a relatively small current flows for each branch circuit, and is attached to a predetermined position of the electric wire of the branch circuit. And connected to the power meter 3 by the signal line 8. The current transformer 2 is simply attached to the branch circuit electric wire 7 by an open type or the like, and by using a dedicated cable as the signal line 8, erroneous connection is prevented in advance.

  The power measuring instrument 3 is connected to the current transformer 2 and includes a burden resistor inserted into a circuit connected to the current transformer 2, and measures the power of the circuit in which the current transformer 2 is installed. The power meter 3 outputs the power calculation result to the monitoring device 4 via the communication line. The power measuring instrument 3 is installed at a predetermined location in the distribution board 1, for example.

  The monitoring device 4 is a dedicated personal computer or the like having a monitor, and is a monitoring unit that manages and displays power information of each branch circuit. The monitoring device 4 is connected to the power meter 3 via RS-485 communication or the like, collects data related to the power usage of each load 5, and displays a graph or the like for data analysis. In the first embodiment, the monitoring device 4 also has a function of detecting an installation error of the current transformer 2. Then, the monitoring device 4 automatically records, for example, data relating to power usage every hour or every day, performs collective management of energy via a network connected to the power meter 3, and allows efficient power consumption. Realize “visualization”.

  The load 5 is various electric devices such as an air conditioner and an IH device, in addition to a lighting device and a personal computer connected to the branch circuit.

  Next, the functional configuration of the power meter 3 provided in the power measurement system S according to the first embodiment will be described with reference to FIG. The power meter 3 includes a current detection unit 31 that detects a current from a signal from the current transformer 2, a voltage detection unit 32 that detects a voltage signal of the circuit, and a current in the current detection unit 31 and a voltage in the voltage detection unit 32. A power calculation unit 33 that calculates power based on each signal is provided.

  The current detection unit 31 includes a burden resistor inserted in a circuit connected to the current transformer 2, an addition circuit that adds a predetermined value to a current signal that has passed through a filter that passes a signal in a predetermined frequency band, and the like. The voltage detection unit 32 is connected to the electric wire 7 via a breaker 6c or the like at a terminal, and a voltage waveform ranges from 0 to 5 V, for example, with respect to a signal that has passed through a voltage step-down circuit and a filter that passes a voltage signal in a predetermined frequency band An adder circuit that applies an appropriate bias is provided.

  The power calculation unit 33 is supplied to the load 5 connected to the electric wire 7 to which the current transformer 2 is attached based on the current measured by the current detection unit 31 and the voltage detected by the voltage detection unit 32. It is a microcomputer that calculates the integrated power amount and average power value. The power calculation unit 33 includes A / D conversion units 331 and 332, a multiplication unit 333, and a transmission circuit unit 334.

  The A / D converter 331 converts the analog signal received from the voltage detector 32 into a digital signal. The A / D converter 332 converts the analog signal received from the current detector 31 into a digital signal. The multiplier 333 is a circuit that multiplies the signals output from the A / D converters 331 and 332, that is, calculates power. The transmission circuit unit 334 includes, for example, a two-wire serial communication circuit compliant with RS485 and transmits a power calculation value to the monitoring device 4 that can communicate with each other via a connected communication line.

  Next, the functional configuration of the monitoring device 4 provided in the power measurement system S according to the first embodiment will be described with reference to FIG. The monitoring device 4 includes a determination calculation unit 41, a display unit 42 that displays various data related to power such as a power value and a power usage amount, and a notification unit 43.

  The determination calculation unit 41 determines a mounting failure of each current transformer 2 based on a calculation process based on a power calculation value received from the power meter 3, and the calculation process is installed in the monitoring device 4 in advance. It is realized in the function of the dedicated program. In the first embodiment, the determination calculation unit 41 is configured such that a circuit measured by one current transformer 2A and a circuit measured by another current transformer 2B, such as the current transformers 2A and 2B shown in FIG. Are measuring the same circuit.

  Specifically, the determination calculation unit 41 is calculated by the power calculation unit 33, and an average power value or an integrated power value of a circuit to which one current transformer 2A in a plurality of circuits is attached, and another current transformer 2B. It is determined whether the difference between the average power value or the integrated power value of the circuit to which the is attached is within a predetermined range. And the determination calculating part 41 uses the algorithm which determines with measuring the same circuit, when the ratio from which the said difference becomes a predetermined range becomes more than a predetermined ratio.

  Here, the difference is within a predetermined range, for example, a range within twice the accuracy error of the current transformer 2 attached to the circuit (maximum error in specification). This is because when a plurality of current transformers 2 are attached to the load 5 / power source wire 7 of the same target, the error of the power value as the calculation result of the power measuring instrument 3 is 2 of the accuracy error of the current transformer 2. It is based on the fact that more than double is not different. For example, as shown in FIG. 3A, when current transformers 2A and 2B with an accuracy error of 2.5% are used, an error in power value due to the difference between current transformers 2A and 2B when the same circuit is measured. Will fall within a range of no more than 5%.

Next, the calculation algorithm of the determination calculation unit 41 will be described with reference to FIGS. FIG. 3B shows the transition of the power value of the circuit to which the current transformer 2A is attached, and FIG. 3B shows the transition of the power value of the circuit to which the current transformer 2B is attached. The determination calculation unit 41 acquires power values f ₁ (t) and f ₂ (t) every predetermined sampling period (for example, every second). Next, the determination calculation unit 41 determines that the difference between f ₁ (t) and f ₂ (t) at the same point is twice the accuracy error of the current transformers 2A and 2B based on the following equation (1), for example. It is determined whether it is within (for example, within 5%).
{(F ₂ (t) −f ₁ (t)) / f ₁ (t)} × 100 ≦ 5 (%) (1)

  The determination calculation unit 41 continues this calculation for a predetermined period (for example, one day). (I) When 90% or more of the differences are within 5%, or (II) The average value of the differences is within 5% In this case, it is determined that the current transformers 2A and 2B are in a trouble state in which the same circuit is measured.

  When the total number of circuits for measuring power using the current transformer 2 is N, the determination calculation unit 41 first compares and determines the circuit 1 and all the circuits 2 to N, and then the circuit 2 The circuits 3 to N are compared, then the circuit 3 and the circuits 4 to N, and finally the circuit (N-1) and the circuit N are compared and determined. Then, when the comparison calculation unit 41 finishes comparing and determining all the circuits, it is determined whether all the circuits are in a normal connection state where the same circuit is not measured or a failure occurs in which the same circuit is measured. it can.

  The display unit 42 is realized by a liquid crystal monitor of a personal computer which is the monitoring device 4, and displays the name of each circuit, the average power (W) of each circuit, the integrated power (Wh), etc., as shown in FIG. . Moreover, the determination result detected in the determination calculating part 41, the response | compatibility based on the said determination result, etc. are displayed. As the determination result, for example, “Circuit 2 and circuit 3 may be measuring the same circuit (same load)” is displayed. Other judgment results include, for example, “Circuit 1 and Circuit 2 may be targeted for the same circuit”, “Check the connection status of current transformers in Circuit 1 and Circuit 2”, “Support Center” The contact information for *** is ***-****. Please contact us. " In this way, the correspondence that the user should be able to take is clearly indicated on the display unit 42 of the monitoring device 4, so that it is possible to further reduce the sense of discomfort felt by the user.

  The alerting | reporting part 43 alert | reports the content which represents the determination result which the determination calculating part 41 detected, and the response | compatibility based on a determination result by utterance and a sound. For example, “Circuit 2 and circuit 3 may be measuring the same circuit (same load)” is issued. For this reason, since the correspondence that the user should be able to take is reported by the utterance / sound of the monitoring device 4, a wider range of users can be targeted.

  As described above, in the power measurement system S according to the first embodiment, the determination calculation unit 41 can determine an attachment error of the current transformer 2 based on a predetermined calculation algorithm, and the attachment state of the current transformer 2 It is possible to automatically detect that there is a defect without visual inspection or inspection.

  In addition, by displaying the determination result on the display unit 42, even when the current transformer 2 is incorrectly attached, the user's uncomfortable feeling due to the incorrect power value being displayed on the monitoring device 4 can be reduced. In addition, even after the power measurement system S is operated, the user can request an inspection of the current transformer 2 to an expert who is qualified for construction based on the display contents of the display unit 42, and the mounting state of the current transformer 2 is correct. Appropriate responses can be taken in the period up to.

(First modification)
A first modification of the first embodiment will be described with reference to FIG. In the first modification, as shown in FIG. 5, it is assumed that the current transformer 2B is mistakenly attached to the wiring adjacent to the wiring to which the current transformer 2A is attached.

  In this case, as shown in FIG. 6, the transition of the power value of the circuit to which the current transformer 2A is attached and the transition of the current value of the circuit to which the current transformer 2B is attached are substantially symmetrical about the time axis. Become. Therefore, in the first modification, the determination calculation unit 41 first inverts the average power value or the integrated power value of the circuit to which the current transformer 2A is attached with the time axis as an axis. The determination calculation unit 41 determines that the difference between the inverted value and the average power value or integrated power value of the circuit to which the current transformer 2B is attached is within a predetermined range (for example, the accuracy error of the current transformers 2A and 2B). Or less). In addition, the determination calculation unit 41 determines that the same circuit is being measured when the predetermined range exceeds the predetermined range.

  Therefore, also in the first modification, as in the first embodiment, the determination calculation unit 41 can determine an error in the mounting position of the current transformer 2 to the circuit, and there is a problem in mounting the current transformer 2. Can be automatically detected without visual inspection or inspection.

(Second modification)
A second modification of the first embodiment will be described. In this modification 2, the construction state of the current transformer 2 in the distribution board 1 is correct, but the power value of the circuit to which one current transformer 2 is attached and the other current transformer 2 are attached. Circuits in which the power values of the circuits accidentally have the same tendency are not erroneously determined as “same circuits”.

  Specifically, the determination calculation unit 41 includes an average power value or an integrated power value of a circuit to which one current transformer 2 is attached in a plurality of circuits, and an average power of a circuit to which another current transformer 2 is attached. It is determined whether the difference from the value or the integrated power value is within a predetermined range. Next, the determination calculation unit 41 determines whether or not the ratio within the predetermined range is equal to or greater than the predetermined ratio, and sets this period to a longer period (for example, two days to one week). As a result, circuits having the same power value of a circuit to which one current transformer 2 is attached and circuits having other current transformers 2 accidentally have the same tendency are referred to as “same circuit”. It is possible to prevent erroneous determination more appropriately.

(Embodiment 2)
A power measurement system according to Embodiment 2 of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the structure similar to the said Embodiment 1, and the detailed description is abbreviate | omitted (hereinafter the same).

  In this Embodiment 2, the attachment position and attachment direction of the current transformer 2 to each circuit, the connector connection between the current transformer 2 and the power measuring instrument 3 are also correct, and there is no construction error of the current transformer 2 However, the name of the circuit set through the display unit 42 during construction or use may be erroneously input. For example, as illustrated in FIG. 7A, a case is assumed where a place where the name setting should be “circuit 3” in the display unit 42 is erroneously input as “circuit 2 (42 a)”. In this case, leaving the erroneous input state causes problems that (I) it is unknown whether the average power of the circuit 2 is correct, that is, 150 W or 300 W, and (II) the measurement leakage of the circuit 3 occurs. Further, in order to correct the input error of the circuit name again correctly, it is necessary to open the distribution board 1 again and check the construction state of the current transformer 2, which requires more labor than necessary.

  Therefore, in the second embodiment, as shown in FIG. 8, the name of the circuit to which the current transformer 2 is attached in the plurality of circuits displayed on the display unit 42 by the monitoring device 4 and the other current transformers. A name detection unit 44 for detecting that the name of the circuit to which the device 2 is attached is the same or similar is provided. The function of the name detection unit 44 can be realized by a dedicated program installed in advance in the monitoring device 4.

  Next, the operation procedure of the power measurement system S according to the second embodiment will be described with reference to FIG. First, each time a name of a circuit is input (S71), the name detection unit 44 verifies whether or not the name already matches, such as a character string being completely matched (S72). When the name detection unit 44 matches the circuit name that has already been input (Yes in S72), the name detection unit 44 prompts the user to reset the name, for example, “the same name is set” or “ Please perform name setting again "(S73). On the other hand, if the name detection unit 44 does not match the already input circuit name (No in S72), the name detection unit 44 executes the next process (S74).

  As described above, in the power measurement system S according to the second embodiment, the setting of the current transformer 2 can be performed by promptly notifying the user that the name of each circuit to which the current transformer 2 is attached is erroneously input. This makes it possible to identify defects and manage power values more correctly.

(Reference example)
A reference example of the power measurement system according to the present invention will be described with reference to FIGS. 9 and 10. In this reference example, as shown in FIG. 9, it is assumed that the installation direction (power supply side and load side) of the current transformer 2 </ b> A with respect to the electric wire is wrong during construction.

  In this case, as shown in FIG. 10, there is a possibility that the average power value and the integrated power value that should be normally displayed on the display unit 42 are displayed as negative values (displayed as −100 W in this figure). is there. Alternatively, the average power value and the integrated power value that should be displayed as negative values in the display unit 42 may be displayed as positive values. Therefore, a “positive / negative” conversion switch 45 is provided in the display unit 42 of the monitoring device 4 so that the power value (−100 W in the figure) selected by the user is compatible with a positive value minus a negative value while leaving the absolute value as it is. It has a function of displaying (in this figure, compatible display with 100W or + 100W). In this case, a warning such as “the current transformer of circuit 1 may be attached in the reverse direction” can be displayed on the display unit 42. The “positive / negative” conversion switch 45 can be provided in a display unit provided on the power meter 3 side, or can be provided as a physical push button or a capacitive switch.

  With this configuration, in this reference example, only by performing the switch operation of the “positive / negative” conversion switch 45, a new construction work is not required for a certain period until the current transformer 2A is correctly installed. It is possible to reduce the user's uncomfortable feeling with respect to the displayed incorrect power value.

  For example, when a power generation device is connected to the branch circuit of the distribution board 1, the current flows to the distribution board 1 simply by operating the “positive / negative” conversion switch 45. The user can set the power value during power generation to a plus display. For this reason, the positive / negative of the power value displayed on the display unit 42 can be displayed corresponding to power selling / buying or charging / discharging, and the user's uncomfortable feeling with respect to the power value displayed on the display unit 42 can be reduced. .

  The present invention is not limited to the configuration of the embodiment described above, and various modifications can be made without departing from the spirit of the invention. For example, the function of the determination calculation unit 41 provided in the monitoring device 4 can be provided on the power meter 3 side.

  In order to achieve the object of the present invention, the present invention is realized as a power measurement method using characteristic constituent means included in the power measurement system as a step, or as a program including these characteristic steps. You can also. The program can be distributed not only in the ROM, but also via a recording medium such as a USB memory or a communication network.

DESCRIPTION OF SYMBOLS S Power measurement system 1 Distribution board 2 Current transformer 3 Power meter 4 Monitoring apparatus 5 Load 6a, 6b, 6c Breaker 7 Electric wire 8 Signal line 31 Current detection part 32 Voltage detection part 33 Power calculation part 41 Determination calculation part (determination Part)
42 Display unit 43 Reporting unit 44 Name detection unit 45 Positive / negative conversion switch

Claims (6)

A voltage detector that detects a voltage signal from the circuit, a current detector that detects a current signal based on an output from a current transformer attached to the circuit, and the voltage detector and the current detector. In a power measurement system comprising: a power calculation unit that calculates a power value of the circuit based on each voltage and current signal; and a display unit that displays a result based on the calculation of the power calculation unit.
Based on the power value of the circuit to which one current transformer in the plurality of circuits is attached and the power value of the circuit to which the other current transformer in the plurality of circuits is attached, A determination unit for determining that one current transformer and the other current transformer are measuring the same circuit ;
The determination unit has a predetermined difference between an average power value or an integrated power value of a circuit to which the one current transformer is attached and an average power value or an integrated power value of a circuit to which the other current transformer is attached. A power measurement system characterized in that it is determined that the same circuit is being measured when it is within a range and within a predetermined range is equal to or greater than a predetermined ratio . A voltage detector that detects a voltage signal from the circuit, a current detector that detects a current signal based on an output from a current transformer attached to the circuit, and the voltage detector and the current detector. In a power measurement system comprising: a power calculation unit that calculates a power value of the circuit based on each voltage and current signal; and a display unit that displays a result based on the calculation of the power calculation unit.
Based on the power value of the circuit to which one current transformer in the plurality of circuits is attached and the power value of the circuit to which the other current transformer in the plurality of circuits is attached, A determination unit for determining that one current transformer and the other current transformer are measuring the same circuit;
The determination unit is a value obtained by inverting an average power value or an integrated power value of a circuit to which the one current transformer is attached with respect to a time axis as an axis, and an average of a circuit to which the other current transformer is attached. It is determined that the same circuit is measured when the difference between the power value or the integrated power value is within a predetermined range and the predetermined range is equal to or greater than the predetermined range. Measuring system. The power measurement system according to claim 1 or 2, wherein the difference is within a predetermined range is a range within twice the accuracy of a current transformer attached to the circuit . The power measurement system according to any one of claims 1 to 3, wherein the display unit further displays at least one of a determination result detected by the determination unit and a correspondence based on the determination result. . The power measurement system according to any one of claims 1 to 4 , further comprising a report unit that reports at least one of a detection result in the determination unit and a response based on the determination result . Name detection for detecting that the name of the circuit to which one current transformer is attached in the plurality of circuits displayed on the display unit is the same as or similar to the name of the circuit to which another current transformer is attached. 6. The power measurement system according to claim 1 , further comprising: a display unit that, when the same or similar, displays the display unit to prompt the user to reset the name. .

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