Computer program for determining the wiring connection status of electronic watt-hour meters

Abstract

To provide means capable of accurately determining connecting states of wires to be connected to an electronic watt-hour meter without being affected by voltage fluctuation.SOLUTION: Measurement value input means 21 inputs an active power value and a reactive power value as measurement values, and an interphase voltage as a voltage measurement value. Measurement value correction means 21a corrects the measurement values to corrected measurement values according to a rated voltage value based on the voltage measurement value. Load value input means 22 inputs a load value of a simulation load 3. Basic data acquisition means 23 acquires an apparent power value and a phase difference obtained based on the load value of the simulation load 3 as basic data. Theoretical value calculation means 24 calculates, from the basic data, an active power value and a reactive power value of each connection state of wires as a theoretical value. Table creation means 25 creates a table for prescribing a relation between the theoretical values and each connection state of the wires. Comparison means 26 compares the corrected measurement value with the theoretical value, and discrimination means 27 specifies the connection state of the wires according to the theoretical value closest to the corrected measurement value.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a computer program for determining the connection state of wiring connected to an electronic watt-hour meter. [Background technology]

[0002] Conventionally, a computer program of this type for determining the connection state of wiring connected to an electronic watt-hour meter is disclosed in, for example, Patent Document 1. This computer program inputs various measurement data from the electronic watt-hour meter to a computer as measurement values, and also inputs the rated capacity and phase angle of a simulated load as load values. Then, using the apparent power value and phase difference obtained based on the rated capacity and phase angle of the simulated load as basic data, it calculates the active power value and reactive power value between each of two predetermined pairs of phases in each connection state of the wiring as theoretical values. Then, it compares the measured value with the theoretical value, and identifies the connection state of the wiring according to the theoretical value having a value closest to the measured value. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6804172 Summary of the Invention [Problem to be solved by the invention]

[0004] However, at the installation site of the electronic watt-hour meter, the voltage actually applied to the electronic watt-hour meter may fluctuate. When the voltage applied to the electronic watt-hour meter fluctuates, the measurement value input from the electronic watt-hour meter to the computer also fluctuates in the above-mentioned conventional computer program. The calculation formula for the active power value W and the reactive power value var includes V 2Since the term / R is included, if the voltage V fluctuates by, for example, 10%, the measured values ​​of the active power value W and reactive power value var will fluctuate by 20%. This voltage fluctuation is the most influential error factor that affects the determination of incorrect wiring connections in electronic watt-hour meters. Therefore, in conventional computer programs, the accuracy of determining the connection status of the wiring connected to the electronic watt-hour meter, which is specified from the comparison between the measured value and the theoretical value, is reduced by this voltage fluctuation. [Means for solving the problem]

[0005] The present invention has been made to solve such problems, Computer 、 electricAn information input means for inputting the phase and wire system and rated voltage value of the slave watt-hour meter as meter information, and when the phase and wire system of the electronic watt-hour meter input by the information input means is a single-phase three-wire system, the active power value and reactive power value measured by the electronic watt-hour meter for each phase between the neutral line and each voltage line of a three-wire single-phase power source are input as measurement values, and the inter-phase voltage of 70[V] to 130[V] or 140[V] to 260[V] between each phase is input as a voltage measurement value. A measurement value input means, a measurement value correction means for correcting the measurement value to a corrected measurement value corresponding to a rated voltage value of 100[V] of the electronic watt-hour meter based on the voltage measurement value when the phase-to-phase voltage is 70[V] to 130[V], and a measurement value correction means for correcting the measurement value to a corrected measurement value corresponding to a rated voltage value of 200[V] of the electronic watt-hour meter based on the voltage measurement value when the phase-to-phase voltage is 140[V] to 260[V], and a rated capacity and phase angle of a simulated load to be connected to the electronic watt-hour meter are input. a load value input means for inputting a theoretical value of each of the phases, the apparent power value between the phases being calculated based on the rated capacity and phase angle of the simulated load inputted to the load value input means, and a phase difference of the current relative to the phase voltage as basic data; a theoretical value calculation means for calculating an active power value and a reactive power value between the phases in each connection state of the wiring connected to the electronic watt-hour meter as theoretical values ​​from the basic data acquired by the basic data acquisition means; a table creation means for creating a table defining the relationship between the theoretical values ​​calculated by the theoretical value calculation means and each connection state of the wiring; a comparison means for comparing a corrected measurement value of a value corrected by the measurement value correction means with a theoretical value defined in the table created by the table creation means; and a determination means for determining a theoretical value having a value closest to the corrected measurement value from a comparison result of the comparison means and specifying a connection state of the wiring corresponding to the determined theoretical value. In order to make the electronic watt-hour meter function as such, we have developed a program for determining the wiring connection status of the electronic watt-hour meter.

[0006] Also, the computer 、 KoAn information input means for inputting the phase and wire system and rated voltage value of the electronic watt-hour meter as meter information, the information input means being provided separately from the computer, and when the phase and wire system of the electronic watt-hour meter input by the information input means is a single-phase three-wire system, the information input means measures the active power value and reactive power value between each phase between the neutral line and each voltage line of a three-wire single-phase power source by the electronic watt-hour meter and outputs the active power value and reactive power value from the external communication port of the electronic watt-hour meter as the measurement values, and outputs the active power value and reactive power value between each phase at 70[V] to 130[V] or 140[V] to 260[V]. a measurement value input means for inputting a phase-to-phase voltage of 100[V] as a voltage measurement value from an external communication port via a sensor; a measurement value correction means for correcting the measurement value to a corrected measurement value corresponding to a rated voltage value of 100[V] of the electronic watt-hour meter based on the voltage measurement value when the phase-to-phase voltage is 70[V] to 130[V], and for correcting the measurement value to a corrected measurement value corresponding to a rated voltage value of 200[V] of the electronic watt-hour meter based on the voltage measurement value when the phase-to-phase voltage is 140[V] to 260[V]; a basic data acquisition means for acquiring, as basic data, an apparent power value and a phase difference of a current relative to a phase voltage from a corrected measurement value corrected by the measurement value correction means; a theoretical value calculation means for calculating, as theoretical values, an active power value and a reactive power value between each phase in each connection state including a normal connection state and an erroneous connection state of wiring connected to a terminal portion of the electronic watt-hour meter from the basic data acquired by the basic data acquisition means; a table creation means for creating a table that specifies the relationship between the theoretical value calculated by the theoretical value calculation means and each connection state of the wiring; a comparison means for comparing the corrected measurement value of the value corrected by the measurement value correction means with the theoretical value specified in the table created by the table creation means; and a determination means for determining a theoretical value having a value closest to the corrected measurement value from a comparison result of the comparison means, and specifying the connection state of the wiring connected to the terminal portion when the electronic watt-hour meter is installed as either a normal connection state or an erroneous connection state according to the determined theoretical value. In order to make the electronic watt-hour meter function as such, we have developed a program for determining the wiring connection status of the electronic watt-hour meter.

[0007] According to these configurations 、3For each phase of a linear single-phase power source, active power values ​​and reactive power values ​​are input from the electronic watt-hour meter to the computer as measurement values ​​by the measurement value input means, and the phase-to-phase voltage is input as a voltage measurement value. The measurement value input by the measurement value input means is then corrected by the measurement value correction means to a corrected measurement value corresponding to the rated voltage value of the electronic watt-hour meter based on the voltage measurement value. The comparison means compares the corrected measurement value corrected by the measurement value correction means with a theoretical value defined in the table created by the table creation means. The determination means determines the theoretical value having a value closest to the corrected measurement value from the comparison result of the comparison means, and specifies the connection state of the wiring connected to the terminal portion when the electronic watt-hour meter was installed according to the determined theoretical value.

[0008] Therefore, by making the computer execute a program that causes the computer to function as each of the above-mentioned means, the measured value to be compared with the theoretical value on which the rated voltage value of the electronic watt-hour meter is calculated is made a corrected measured value corresponding to the rated voltage value of the electronic watt-hour meter. This makes it possible to accurately determine the connection state of the wiring connected to the electronic watt-hour meter without being affected by voltage fluctuations at the installation site of the electronic watt-hour meter. Effect of the Invention

[0009] According to the present invention, it is possible to provide a computer program that can accurately determine the connection state of wiring connected to an electronic watt-hour meter without being affected by voltage fluctuations at the installation site of the electronic watt-hour meter. [Brief description of the drawings]

[0010] [Figure 1] 1 is a connection diagram between a personal computer to which a computer program according to an embodiment of the present invention is applied and an electronic watt-hour meter. [Diagram 2] 2 is a block diagram showing the internal configuration of the personal computer shown in FIG. 1. [Diagram 3]1 is a first table showing a comparison between a table created by a computer program according to an embodiment and correction values ​​of measurement values ​​input from an electronic watt-hour meter; FIG. [Figure 4] FIG. 2 is a second table showing a comparison between a table created by the computer program according to the embodiment and correction values ​​of measurement values ​​input from an electronic watt-hour meter; [Diagram 5] FIG. 11 is a third table showing a comparison between a table created by the computer program according to the embodiment and correction values ​​of measurement values ​​input from an electronic watt-hour meter. [Figure 6] FIG. 6 is a table following the third table shown in FIG. 5 . DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Next, an embodiment for carrying out a computer program for determining the wiring connection state of an electronic watt-hour meter according to the present invention will be described.

[0012] FIG. 1 is a connection diagram between a personal computer (hereinafter, abbreviated as PC) 1 to which a computer program for determining a wiring connection state of an electronic watt-hour meter according to an embodiment of the present invention is applied as an application, and an electronic watt-hour meter 2.

[0013] The electronic watt-hour meter 2 is configured with components such as an electronic circuit board built into a rectangular parallelepiped housing. The electronic watt-hour meter 2 has a display unit 2a that displays a measurement value on its front side, and a terminal unit 2b below which each wiring is connected. The electronic watt-hour meter 2 in this embodiment is a three-phase three-wire type, and a power supply voltage is applied to each of the power supply terminals P1 terminal, P2 terminal, and P3 terminal of the terminal unit 2b from the power supply wiring of the first, second, and third phases of a three-phase power supply via a VT (voltage converter). The P1 terminal is connected to the output terminal 1u of the VT, the P2 terminal is connected to the output terminals 1v and 3u that are grounded, and the P3 terminal is connected to the output terminal 3v.

[0014] The phase-to-phase voltage between phases 1 and 2 of the three-phase power supply appears between output terminals 1u and 1v of the VT, and the phase-to-phase voltage between phases 2 and 3 of the three-phase power supply appears between output terminals 3u and 3v. Therefore, the phase-to-phase voltage on the 1st side between phases 1 and 2 of the three-phase power supply is applied between the P1 and P2 terminals, and the phase-to-phase voltage on the 3rd side between phases 3 and 2 of the three-phase power supply is applied between the P3 and P2 terminals. Here, phases 1 and 2 and phases 2 and 3 constitute two predetermined pairs of phases of the three-phase power supply. The phase-to-phase voltage on the 1st side and the phase-to-phase voltage on the 3rd side constitute two predetermined pairs of phase-to-phase voltages of the three-phase power supply.

[0015] When checking the wiring connection state of the electronic watt-hour meter 2, if the actual load 6 is not connected to the three-phase power supply, the dummy load 3 is connected to the three-phase power supply. When the actual load 6 is connected to the three-phase power supply, the dummy load 3 does not have to be connected, but the dummy load 3 may be connected to the three-phase power supply together with the actual load 6. In this embodiment, the dummy load 3 is connected to the three-phase power supply when obtaining theoretical values, which will be described later, and the actual load 6 is connected to the three-phase power supply when checking the wiring connection state of the electronic watt-hour meter 2.

[0016] The dummy load 3 is a load for checking the wiring connection when the electronic watt-hour meter 2 is installed, and the load capacity is known in advance. In this embodiment, a 100 [μF] phase-leading capacitor is used for the dummy load 3, and its rated capacity is 726 [VA] (rated voltage 200 [V], rated current 3.63 [A]), and the phase angle of the load, which is the power factor angle, is 90°. When the real load 6 is connected, a line current according to the load capacity of the real load 6 flows in each of the first and third phases of the three-phase power supply. The line current flowing in the first phase of the three-phase power supply is detected between the 1S terminal and the 1L terminal of the terminal section 2b from the power supply wiring of the first phase via the output terminals 1K and 1L of the CT (current converter), and the line current flowing in the third phase is detected between the 3S terminal and the 3L terminal of the terminal section 2b from the power supply wiring of the three phase via the output terminals 3K and 3L of the CT. The 1L terminal and the 3L terminal are grounded together with the P2 terminal.

[0017] The electronic watt-hour meter 2 calculates a signed 1-side active power value W1 and a 1-side reactive power value var1 by multiplying the 1-side phase-to-phase voltage P1 applied between the P1 and P2 terminals by the 1-side line current I1 detected between the 1S and 1L terminals. It also calculates a signed 3-side active power value W3 and a 3-side reactive power value var3 by multiplying the 3-side phase-to-phase voltage P3 applied between the P3 and P2 terminals by the 3-side line current I3 detected between the 3S and 3L terminals. It then calculates a combined active power value ΣW of the 1-side active power value W1 and the 3-side active power value W3, and a combined reactive power value Σvar of the 1-side reactive power value var1 and the 3-side reactive power value var3. The electronic watt-hour meter 2 also calculates a voltage phase difference θp1-p3 between the 1-side phase-to-phase voltage P1 and the 3-side phase-to-phase voltage P3.

[0018] The electronic watt-hour meter 2 has an infrared communication port and a metering pulse output port (not shown) on the front side. From this infrared communication port, various measurement data measured by the electronic watt-hour meter 2 are output by infrared to the outside of the electronic watt-hour meter 2. In this embodiment, as this measurement data, active energy Wh, reactive energy varh, active power (total active power ΣW), reactive power (total reactive power Σvar), phase-to-phase voltage P1 on the 1st side, phase-to-phase voltage P3 on the 3rd side, etc. are output. In addition, from the infrared communication port, meter information of the electronic watt-hour meter 2 and setting information set in the electronic watt-hour meter 2 are also output. In this embodiment, as this meter information, a meter ID that identifies the serial number and manufacturing year of the electronic watt-hour meter 2, a phase line system, a rated voltage, and a rated current of the electronic watt-hour meter 2 are output. In addition, as setting information, a multiplying factor for the display value of the display unit 2a, a transformation ratio constant of VT·CT, a pulse type, a pulse constant, and a pulse width of the metering pulse output from the metering pulse output port are output.

[0019] The PC1 detects infrared rays output from an infrared communication port with a sensor 4, and inputs various measurement data measured by the electronic watt-hour meter 2 together with the meter information and setting information via a cable 5. Note that, although in this embodiment, communication between the electronic watt-hour meter 2 and the PC1 is performed by infrared communication, it can also be performed by other communication methods such as a serial communication method such as RS485, a current loop communication method, or a wireless communication method.

[0020] 2 is a block diagram showing a schematic configuration inside PC 1. In PC 1, CPU (Central Processing Unit) 13 performs various calculations according to a program stored in ROM (Read Only Memory) 11, using RAM (Read and Write Memory) 12 as a temporary storage work area. By performing these calculations according to the program stored in ROM 11, CPU 13 causes PC 1, which is a computer, to function as measurement value input means 21, measurement value correction means 21a, load value input means 22, basic data acquisition means 23, theoretical value calculation means 24, table creation means 25, comparison means 26, discrimination means 27, information input means 28, and data output means 29.

[0021] The measurement value input means 21 inputs various measurement data including active power values ​​W1, W3 and reactive power values ​​var1, var3 measured by the electronic watt-hour meter 2 for each of two predetermined pairs of phases as measurement values ​​and interphase voltages P1, P3 as voltage measurement values ​​from the electronic watt-hour meter 2 via the sensor 4 and cable 5. The measurement value correction means 21a corrects the measurement values ​​of the active power values ​​W1, W3 and reactive power values ​​var1, var3 input by the measurement value input means 21 to corrected measurement values ​​corresponding to the rated voltage value of the electronic watt-hour meter 2, based on the voltage measurement values ​​input by the measurement value input means 21.

[0022] The corrected measurement values ​​of the active power value W1 and the reactive power value var1 are calculated from the measurement values ​​of the active power value W1 and the reactive power value var1, the rated voltage value VR of the electronic power meter 2, and the phase-to-phase voltage P1, for example, as shown in the following equation (1-1). Corrected measurement value (W1, var1) = measurement value (W1, var1) × (VR / P1) 2 …(1-1)

[0023] In addition, the corrected measurement values ​​of the active power value W3 and the reactive power value var3 are calculated from the measurement values ​​of the active power value W3 and the reactive power value var3, the rated voltage value VR of the electronic power meter 2, and the phase-to-phase voltage P3, for example, as shown in the following equation (1-2). Corrected measurement value (W3, var3) = measurement value (W3, var3) × (VR / P3) 2 …(1-2)

[0024] The load value input means 22 inputs the rated capacity and phase angle of the simulated load 3 connected to the electronic watt-hour meter 2 as load values ​​from the keyboard 14 of the PC 1 or the like. The basic data acquisition means 23 acquires the apparent power values ​​PI1, PI3 between each of two predetermined pairs of phases and the phase differences θ1, θ3 of the line currents I1, I3 relative to the phase-to-phase voltages P1, P3 as basic data. In this embodiment, the basic data acquisition means 23 acquires the apparent power values ​​PI1, PI3 and the phase differences θ1, θ3 calculated based on the rated capacity and phase angle of the simulated load 3 input to the load value input means 22 as basic data.

[0025] In this embodiment, a three-phase balanced load is used as the dummy load 3, so the theoretical values ​​of the apparent power values ​​PI1, PI3 and the phase differences θ1, θ3 on sides 1 and 3 are equal to each other, and are expressed by the following equations (2-1) and (2-2) based on the load value of the dummy load 3. PI1=PI3=200[V]×3.63[A]=726[VA]…(2-1) θ1=θ3=90° …(2-2)

[0026] The theoretical value calculation means 24 calculates the active power values ​​W1, W3 and reactive power values ​​var1, var3 between each of two predetermined pairs of phases in each connection state of the wiring connected to the electronic watt-hour meter 2 as theoretical values ​​from the basic data acquired by the basic data acquisition means 23, using a calculation formula described later. The table creation means 25 creates a table that specifies the relationship between the theoretical values ​​calculated by the theoretical value calculation means 24 and each connection state of the wiring. The comparison means 26 compares the corrected measurement value corrected by the measurement value correction means 21a with the theoretical value specified in the table created by the table creation means 25. The determination means 27 determines the theoretical value having a value closest to the corrected measurement value from the comparison result of the comparison means 26, and specifies the connection state of the wiring according to the determined theoretical value.

[0027] In this embodiment, the measurement value input means 21 inputs a voltage phase difference θp1-p3 between a phase-to-phase voltage P1 on the 1 side and a phase-to-phase voltage P3 on the 3 side, which is between two predetermined pairs of phase-to-phase voltages, from the electronic watt-hour meter 2. The comparison means 26 further compares the voltage phase difference θp1-p3 input by the measurement value input means 21 with a voltage phase difference of 300° between the phase-to-phase voltage P1 on the 1 side and the phase-to-phase voltage P3 on the 3 side, which is a predetermined voltage phase difference. The determination means 27 further refers to the comparison result of the comparison means 26 between the voltage phase difference θp1-p3 and the predetermined voltage phase difference of 300°, to identify the connection state of the wiring.

[0028] The information input means 28 inputs meter information of the electronic watt-hour meter 2 and setting information set in the electronic watt-hour meter 2 from the electronic watt-hour meter 2 via the sensor 4 and the cable 5. The data output means 29 outputs information on the wiring connection state identified by the determination means 27 as data together with the meter information and setting information input by the information input means 28. This data output is performed from the USB port 15 provided in the PC 1 in accordance with the USB standard and is output as PDF data or table data, or is performed to the printer 16 and output on paper.

[0029] 3 to 6 show a part of the table created by the table creating means 25. In this table, a connection diagram showing each connection state of the wiring connected to the electronic watt-hour meter 2, a connection terminal correspondence table showing the connection relationship between each terminal corresponding to the connection diagram, and a calculation formula and a vector diagram of the theoretical value corresponding to each connection state of the wiring. The vector diagram shows the relative phase relationship between two predetermined pairs of inter-phase voltages P1, P3 and line currents I1, I3 in each connection state of the wiring. The calculation formula of the theoretical value is used to calculate the theoretical values ​​of the active power values ​​W1, W3 and the reactive power values ​​var1, var3 in the theoretical value computing means 24, and the calculation results (not shown) calculated by the calculation formula are specified in the table as theoretical values ​​corresponding to each connection state of the wiring.

[0030] Each theoretical value defined in the table is compared by the comparison means 26 with each corrected measurement value corrected by the measurement value correction means 21a. The measurement results shown in the figure alongside the table indicate values ​​such as the corrected measurement values ​​input by the measurement value input means 21 when the wiring is in the connection state shown in the table and corrected by the measurement value correction means 21a. These corrected measurement values ​​shown in the measurement results are values ​​obtained when the dummy load as the actual load 6 is an R load with a pure resistance with a power factor of 1.0, such as a hair dryer, and a C load with a capacitor with a power factor of 0.0, such as a leading-phase capacitor.

[0031] The connection state of the wiring connected to the electronic watt-hour meter 2 is identified using the corrected measurement values ​​of the 1-side active power value W1 [W] and the 1-side reactive power value var1 [var], the corrected measurement values ​​of the 3-side active power value W3 [W] and the 3-side reactive power value var3 [var], the measured voltage values ​​of the 1-side voltage V1 and the 3-side voltage V3, and the voltage phase difference θp1-p3, which are shown in the measurement results. In other words, the total active power value ΣW [W] and the total reactive power value Σvar [var] are not referenced when identifying the connection state of the wiring.

[0032] The table shown in the upper part of Fig. 3 shows a connection diagram and a connection terminal correspondence table as well as theoretical value calculation formulas and vector diagrams when the wiring connected to the electronic watt-hour meter 2 is normally connected. The theoretical values ​​of the active power values ​​W1, W3 and the reactive power values ​​var1, var3 when the wiring is normally connected are calculated using the following formulas (3-1) to (3-4) shown in the table, based on the apparent powers PI1, PI3 and phase differences θ1, θ3, which are basic data. The theoretical values ​​calculated by these formulas are stored in a table by the table creation means 25 in correspondence with the normal wiring connection. W1 = PI1 cos(θ1 + 30°) … (3-1) var1=PI1sin(θ1+30°) …(3-2) W3=PI3cos(θ3-30°) …(3-3) var3=PI3sin(θ3-30°) …(3-4)

[0033] The measurement results listed in the table when the wiring is normally connected are corrected measurement values ​​obtained by correcting, by the measurement value correcting means 21a, the measurement values ​​for the actual load 6 input from the electronic watt-hour meter 2 by the measurement value input means 21 when the wiring is normally connected. The corrected measurement values ​​of the active power values ​​W1, W3 and the reactive power values ​​var1, var3 are values ​​closest to theoretical values ​​(not shown) calculated by the formulas (3-1) to (3-4) and defined for the normal wiring connection state in the table created by the table creating means 25. Therefore, the determining means 27 determines the theoretical value having the value closest to the corrected measurement value from the comparison result of the comparing means 26, and the normal connection state is specified as the connection state of the wiring according to the determined theoretical value.

[0034] Also, in table No. E1 in Fig. 3, a connection diagram, a connection terminal correspondence table, a theoretical value calculation formula, and a vector diagram are shown when only the voltage circuit wiring is misconnected. In addition to the illustrated table No. E1, there are other tables that provide connection diagrams, connection terminal correspondence tables, theoretical value calculation formulas, and vector diagrams when only the voltage circuit wiring is misconnected, but these are not shown in the figures.

[0035] Table No. E1 specifies the cases where there is a mistake in the wiring connection between the VT output terminal 1u and output terminal 1v. In other words, as shown by the wiring shown in dashed lines in the connection diagram and in bold italics in the connection terminal correspondence table, the P1 terminal is mistakenly connected to the VT output terminal 1v instead of the output terminal 1u, and the P2 terminal is mistakenly connected to the VT output terminals 1u, 3u, and G (ground) instead of the output terminals 1u, 3u, and G.

[0036] The theoretical values ​​of the active power values ​​W1, W3 and the reactive power values ​​var1, var3 in the case of this incorrect wiring connection are calculated using the following equations (4-1) to (4-4) shown in the table, based on the basic data of the apparent powers PI1, PI3 and the phase differences θ1, θ3. The theoretical values ​​calculated by these equations are stored in the table by the table creation means 25 in correspondence with the above incorrect wiring connection. W1 = PI1 cos(θ1 - 150°) … (4-1) var1=PI1sin(θ1-150°) …(4-2) W3 = PI3 cos(θ3 - 30°) … (4-3) var3=PI3sin(θ3-30°) …(4-4)

[0037] The measurement results listed in table No. E1 are corrected measurement values ​​obtained by correcting the measurement values ​​of the actual load 6 input from the electronic watt-hour meter 2 by the measurement value input means 21 when the above-mentioned erroneous connection exists in the wiring connection between the output terminal 1u and the output terminal 1v of the VT, by the measurement value correcting means 21a. The corrected measurement values ​​of the active power values ​​W1, W3 and the reactive power values ​​var1, var3 are values ​​closest to the theoretical values ​​(not shown) calculated by the formulas (4-1) to (4-4) and defined for the above-mentioned erroneous wiring connection state in the table created by the table creating means 25. Therefore, the theoretical value having the value closest to the corrected measurement value is determined from the comparison result of the comparing means 26 by the determining means 27, and the erroneous connection state in which the above-mentioned erroneous connection exists in the wiring connection between the output terminal 1u and the output terminal 1v of the VT is specified as the wiring connection state corresponding to the determined theoretical value.

[0038] Also, in Tables No. A1 and No. A2 in Fig. 4, connection diagrams and connection terminal correspondence tables as well as theoretical value calculation formulas and vector diagrams are shown when only the current circuit wiring is misconnected. In addition to Tables No. A1 and No. A2 shown in the figures, there are other tables following the connection diagrams and connection terminal correspondence tables as well as theoretical value calculation formulas and vector diagrams when only the current circuit wiring is misconnected, but these are not shown.

[0039] Table No. A1 specifies the case where there is an erroneous connection in the wiring between the 1S terminal and the 1L terminal. That is, as shown by the wiring in the connection diagram with a dashed line and by the bold italic letters in the connection terminal correspondence table, the 1S terminal is erroneously connected to the output terminals 1L and G of the CT instead of being connected to the output terminal 1K, and the 1L terminal is erroneously connected to the output terminal 1K instead of being connected to the output terminals 1L and G of the CT. The theoretical values ​​of the active power values ​​W1, W3 and the reactive power values ​​var1, var3 in this erroneous wiring connection are calculated using the following formulas (5-1) to (5-4) shown in the table, based on the apparent powers PI1, PI3 and the phase differences θ1, θ3, which are basic data. The theoretical values ​​calculated by these formulas are stored in the table by the table creation means 25 in correspondence with the above-mentioned erroneous wiring connections. W1 = PI1 cos(θ1 + 210°) … (5-1) var1=PI1sin(θ1+210°) …(5-2) W3 = PI3 cos(θ3 + 330°) … (5-3) var3=PI3sin(θ3+330°) …(5-4)

[0040] The measurement results listed in table No. A1 are corrected measurement values ​​obtained by correcting, by the measurement value correcting means 21a, the measurement values ​​for the actual load 6 input from the electronic watt-hour meter 2 by the measurement value input means 21 when the above-mentioned erroneous connection exists in the wiring connection between the 1S terminal and the 1L terminal. The corrected measurement values ​​of the active power values ​​W1, W3 and the reactive power values ​​var1, var3 are values ​​closest to the theoretical values ​​(not shown) calculated by the formulas (5-1) to (5-4) and defined for the above-mentioned erroneous wiring connection state in the table created by the table creating means 25. Therefore, the determining means 27 determines the theoretical value having the value closest to the corrected measurement value from the comparison result of the comparing means 26, and the erroneous connection state in which the above-mentioned erroneous connection exists in the wiring connection between the 1S terminal and the 1L terminal is specified as the wiring connection state corresponding to the determined theoretical value.

[0041] Table No. A2 specifies the case where there is an erroneous connection in the wiring between the 3S terminal and the 3L terminal. That is, as shown by the wiring in the connection diagram with a dashed line and by the bold italic letters in the connection terminal correspondence table, the 3S terminal is erroneously connected to the output terminals 3L and G of the CT instead of being connected to the output terminal 3K, and the 3L terminal is erroneously connected to the output terminal 3K instead of being connected to the output terminals 3L and G of the CT. The theoretical values ​​of the active power values ​​W1, W3 and the reactive power values ​​var1, var3 in this erroneous wiring connection are calculated using the following formulas (6-1) to (6-4) shown in the table, based on the apparent powers PI1, PI3 and phase differences θ1, θ3, which are basic data. The theoretical values ​​calculated by these formulas are stored in the table by the table creation means 25 in correspondence with the above-mentioned erroneous wiring connections. W1 = PI1 cos(θ1 + 30°) … (6-1) var1=PI1sin(θ1+30°) …(6-2) W3 = PI3 cos(θ3 + 150°) … (6-3) var3=PI3sin(θ3+150°) …(6-4)

[0042] The measurement results listed in table No. A2 are corrected measurement values ​​obtained by correcting, by the measurement value correcting means 21a, the measurement values ​​for the actual load 6 input from the electronic watt-hour meter 2 by the measurement value input means 21 when the above-mentioned erroneous connection exists in the wiring connection between the 3S terminal and the 3L terminal. The corrected measurement values ​​of the active power values ​​W1, W3 and the reactive power values ​​var1, var3 are values ​​closest to the theoretical values ​​(not shown) calculated by the formulas (6-1) to (6-4) and defined for the above-mentioned erroneous wiring connection state in the table created by the table creating means 25. Therefore, the determining means 27 determines the theoretical value having the value closest to the corrected measurement value from the comparison result of the comparing means 26, and the erroneous connection state in which the above-mentioned erroneous connection exists in the wiring connection between the 3S terminal and the 3L terminal is specified as the wiring connection state corresponding to the determined theoretical value.

[0043] Also, in tables No. EA1 and No. EA2 in Fig. 5 and table No. EA3 in Fig. 6, connection diagrams, connection terminal correspondence tables, theoretical value calculation formulas, and vector diagrams are shown when the combination of voltage circuit wiring and current circuit wiring is incorrectly connected. In addition to the illustrated tables No. EA1, No. EA2, and No. EA3, there are other tables that contain connection diagrams, connection terminal correspondence tables, theoretical value calculation formulas, and vector diagrams when the misconnections occur, but these tables are not shown.

[0044] Table No. EA1 specifies the case where the wiring of the 1st phase side and the 3rd phase side are swapped to result in a reversed phase connection, and there is a misconnection between the P1 terminal on the 1st phase side and the P3 terminal on the 3rd phase side. That is, as shown by the wiring shown by the dashed line in the connection diagram and by the bold italicized letters in the connection terminal correspondence table, the P1 terminal is misconnected to the output terminal 3v of the VT instead of the output terminal 1u, and the P3 terminal is misconnected to the output terminal 1u of the VT instead of the output terminal 3v. Due to this misconnection of the voltage circuit wiring, the 1S terminal is misconnected to the output terminal 3K of the CT instead of the output terminal 1K, and the 1L terminal is misconnected to the output terminals 3L and G of the CT instead of the output terminals 1L and G. Also, the 3S terminal is misconnected to the output terminal 1K of the CT instead of the output terminal 3K, and the 3L terminal is misconnected to the output terminals 1L and G of the CT instead of the output terminals 3L and G.

[0045] The theoretical values ​​of the active power values ​​W1, W3 and the reactive power values ​​var1, var3 in the case of this incorrect wiring connection are calculated using the following equations (7-1) to (7-4) shown in the table, based on the basic data of the apparent powers PI1, PI3 and the phase differences θ1, θ3. The theoretical values ​​calculated by these equations are stored in the table by the table creation means 25 in correspondence with the above incorrect wiring connection. W1 = PI3cos(θ3-30°) … (7-1) var1=PI3sin(θ3-30°) …(7-2) W3 = PI1 cos(θ1 + 30°) … (7-3) var3=PI1sin(θ1+30°) …(7-4)

[0046] The measurement results listed in table No. EA1 are corrected measurement values ​​obtained by correcting the measurement values ​​of the actual load 6 input from the electronic watt-hour meter 2 by the measurement value input means 21 when there is the above-mentioned erroneous connection in the wiring connection between the P1 terminal on the 1st phase side and the P3 terminal on the 3rd phase side by the measurement value correcting means 21a. The corrected measurement values ​​of the active power values ​​W1, W3 and the reactive power values ​​var1, var3 are values ​​closest to the theoretical values ​​(not shown) calculated by the formulas (7-1) to (7-4) that are defined for the above-mentioned erroneous connection state of the wiring in the table created by the table creating means 25. Therefore, the determining means 27 determines the theoretical value having the value closest to the corrected measurement value from the comparison result of the comparing means 26, and specifies the erroneous connection state in which there is the above-mentioned erroneous connection in the wiring connection between the P1 terminal on the 1st phase side and the P3 terminal on the 3rd phase side as the wiring connection state corresponding to the determined theoretical value.

[0047] Table No. EA2 specifies cases where there are misconnections that combine the misconnections of the voltage circuit wiring specified in Table No. E1 and the misconnections of the current circuit wiring specified in Table No. A1. That is, as shown by the wiring shown in dashed lines in the connection diagram and by bold italic letters in the connection terminal correspondence table, the wiring connections between the output terminals 1u and 1v of the VT are swapped, the P1 terminal is mistakenly connected to the output terminal 1v of the VT instead of the output terminal 1u, and the P2 terminal is mistakenly connected to the output terminals 1u, 3u, and G of the VT instead of the output terminals 1v, 3u, and G. Furthermore, the wiring connections between the 1S terminal and the 1L terminal are swapped, the 1S terminal is mistakenly connected to the output terminals 1L and G of the CT instead of the output terminal 1K, and the 1L terminal is mistakenly connected to the output terminal 1K of the CT instead of the output terminals 1L and G.

[0048] The theoretical values ​​of the active power values ​​W1, W3 and the reactive power values ​​var1, var3 in the case of this incorrect wiring connection are calculated using the following equations (8-1) to (8-4) shown in the table, based on the basic data of the apparent powers PI1, PI3 and the phase differences θ1, θ3. The theoretical values ​​calculated by these equations are stored in the table by the table creation means 25 in correspondence with the above incorrect wiring connection. W1 = PI1 cos(θ1 + 30°) … (8-1) var1=PI1sin(θ1+30°) …(8-2) W3 = PI3 cos(θ3 + 330°) … (8-3) var3=PI3sin(θ3+330°) …(8-4)

[0049] The measurement results listed in table No. EA2 are corrected measurement values ​​obtained by correcting, by the measurement value correcting means 21a, the measurement values ​​for the actual load 6 input from the electronic watt-hour meter 2 by the measurement value input means 21 when there is the above-mentioned erroneous connection in the wiring connection between the output terminal 1u and the output terminal 1v of the VT and the wiring connection between the 1S terminal and the 1L terminal. The corrected measurement values ​​of the active power values ​​W1, W3 and the reactive power values ​​var1, var3 are the same as the corrected measurement values ​​input by the measurement value input means 21 when the wiring is normally connected as shown in Fig. 3, and are closest to the theoretical values ​​(not shown) calculated by the formulas (8-1) to (8-4) prescribed for the above-mentioned erroneous wiring connection state in the table created by the table creating means 25, and at the same time, are closest to the theoretical values ​​(not shown) calculated by the formulas (3-1) to (3-4) prescribed for the normal wiring connection state shown in Fig. 3.

[0050] This is because the phases of the cosine and sine on the right-hand sides of the above equations (8-3) and (8-4) are θ3+330°=θ3-30°, and the values ​​of the active power value W3 and the reactive power value var3 shown in equations (8-3) and (8-4) become the same as the values ​​in the normal connection state shown in equations (3-3) and (3-4). Therefore, the determining means 27 determines two theoretical values ​​having values ​​closest to the corrected measured value in the above-mentioned incorrect wiring connection state from the comparison results of the comparing means 26, and it becomes impossible to identify whether the wiring connection state is the above-mentioned incorrect connection state or the normal connection state.

[0051] For this reason, in this embodiment, the comparison means 26 further compares the voltage phase difference θp1-p3 input by the measurement value input means 21 when the wiring is in the above-mentioned erroneous connection state with the predetermined voltage phase difference of 300°. The measurement value correction means 21a does not correct the voltage phase difference θp1-p3 using the formulas (1-1) and (1-2). The determination means 27 further refers to the comparison result of the comparison means 26 between the voltage phase difference θp1-p3 and the predetermined voltage phase difference of 300° to specify the connection state of the wiring. If the voltage phase difference θp1-p3 does not match the predetermined voltage phase difference of 300°, the determination means 27 determines that the measurement value measured together with the voltage phase difference θp1-p3 was measured when the wiring was in the erroneous connection state.

[0052] The voltage phase difference θp1-p3 input by the measurement value input means 21 when the wiring is in a normal connection state is 300° as shown in the measurement results (see FIG. 3) arranged in the table when the wiring is in a normal connection state, and coincides with the predetermined voltage phase difference of 300°. On the other hand, the voltage phase difference θp1-p3 input by the measurement value input means 21 when the wiring is in the above-mentioned erroneous connection state is 120° as shown in the measurement results arranged in table No. EA2, and does not coincide with the predetermined voltage phase difference of 300°. Therefore, the measurement values ​​of the active power values ​​W1, W3 and the reactive power values ​​var1, var3 measured together with the voltage phase difference θp1-p3 of 120° are determined by the determination means 27 to be those measured when the wiring is in an erroneous connection state, and the wiring connection state is identified as an erroneous connection state in which the above-mentioned erroneous connection exists in the wiring connection between the output terminal 1u and the output terminal 1v of the VT and the wiring connection between the 1S terminal and the 1L terminal.

[0053] When checking the connection state of the wiring, the corrected value of the measurement value input from the electronic watt-hour meter 2 by the measurement value input means 21 may be the closest value to the two theoretical values ​​defined in the table for each misconnection state of the wiring, as described above. In this case, it may not always be possible to identify the misconnection state of the wiring by comparing the voltage phase difference θp1-p3 with the predetermined voltage phase difference of 300°, as in the case of the misconnection described above. However, since the voltage phase difference θp1-p3 does not match the predetermined voltage phase difference of 300°, it is clear that there is a misconnection in the wiring connection and that it is one of the two misconnection states corresponding to the two theoretical values ​​to which the corrected measurement value is the closest value. Therefore, in such a case, it is necessary to investigate and check the wiring state by focusing on the two misconnection states.

[0054] Table No. EA3 shown in Fig. 6 specifies a case where there is a misconnection that combines the misconnection of the voltage circuit wiring specified in Table No. E1 and the misconnection of the current circuit wiring specified in Table No. A2. That is, as shown by the wiring shown in dashed lines in the connection diagram and by bold italic letters in the connection terminal correspondence table, the wiring connections between the output terminals 1u and 1v of the VT are swapped, the P1 terminal is mistakenly connected to the output terminal 1v of the VT instead of being connected to the output terminal 1u, and the P2 terminal is mistakenly connected to the output terminals 1u, 3u, and G of the VT instead of being connected to the output terminals 1v, 3u, and G. Furthermore, the wiring connections between the 3S terminal and the 3L terminal are swapped, the 3S terminal is mistakenly connected to the output terminals 3L and G of the CT instead of being connected to the output terminals 3K of the CT, and the 3L terminal is mistakenly connected to the output terminal 3K of the CT instead of being connected to the output terminals 3L and G.

[0055] The theoretical values ​​of the active power values ​​W1, W3 and the reactive power values ​​var1, var3 in the case of this incorrect wiring connection are calculated using the following formulas (9-1) to (9-4) shown in the table, based on the basic data of the apparent powers PI1, PI3 and the phase differences θ1, θ3. The theoretical values ​​calculated by these formulas are stored in the table by the table creation means 25 in correspondence with the above incorrect wiring connection. W1 = PI1 cos(θ1 + 210°) … (9-1) var1=PI1sin(θ1+210°) …(9-2) W3 = PI3 cos(θ3 + 150°) … (9-3) var3=PI3sin(θ3+150°) …(9-4)

[0056] The measurement results listed in table No. EA3 are corrected measurement values ​​obtained by correcting the measurement values ​​of the actual load 6 input from the electronic watt-hour meter 2 by the measurement value input means 21 when there is the above-mentioned erroneous connection in the wiring connection between the output terminal 1u and the output terminal 1v of the VT and the wiring connection between the 3S terminal and the 3L terminal by the measurement value correcting means 21a. The corrected measurement values ​​of the active power values ​​W1, W3 and the reactive power values ​​var1, var3 are values ​​closest to the theoretical values ​​(not shown) calculated by the formulas (9-1) to (9-4) specified for the above-mentioned erroneous connection state of the wiring in the table created by the table creating means 25. Therefore, the determining means 27 determines the theoretical value having the value closest to the corrected measurement value from the comparison result of the comparing means 26, and specifies the erroneous connection state in which the above-mentioned erroneous connection exists in the wiring connection between the output terminal 1u and the output terminal 1v of the VT and the wiring connection between the 3S terminal and the 3L terminal as the wiring connection state corresponding to the determined theoretical value.

[0057] According to the computer program for determining the wiring connection state of the electronic watt-hour meter 2 according to the present embodiment, as described above, for each of two predetermined pairs of phases of the three-phase power supply, the active power values ​​W1, W3 and the reactive power values ​​var1, var3 are input as measured values ​​from the electronic watt-hour meter 2 to the PC1 by the measured value input means 21, and the interphase voltages P1, P3 are input as measured voltage values. Then, the measured values ​​of the active power values ​​W1, W3 and the reactive power values ​​var1, var3 input by the measured value input means 21 are corrected to corrected measured values ​​corresponding to the rated voltage value VR of the electronic watt-hour meter 2 by the measured value correcting means 21a using the formulas (1-1) and (1-2) based on the measured voltage values ​​input by the measured value input means 21. The comparing means 26 compares the corrected measured values ​​corrected by the measured value correcting means 21a with theoretical values ​​defined in the table created by the table creating means 25. In the discrimination means 27, the theoretical value having the closest value to the corrected measured value is discriminated from the comparison result of the comparison means 26, and the connection state of the wiring connected to the terminal portion 2b when the electronic electricity meter 2 was installed is identified according to the discriminated theoretical value.

[0058] Therefore, by having the PC1 execute a program that causes the computer to function as each of the above means, the measurement value to be compared with the theoretical value based on the calculation of the rated voltage value VR of the electronic watt-hour meter 2 becomes a corrected measurement value corresponding to the rated voltage value VR of the electronic watt-hour meter 2. This makes it possible to accurately determine the connection state of the wiring connected to the electronic watt-hour meter 2 without being affected by voltage fluctuations at the installation site of the electronic watt-hour meter 2.

[0059] In this embodiment, when determining the connection state of the wiring connected to the electronic watt-hour meter 2, in order to eliminate the influence of voltage fluctuations at the installation site of the electronic watt-hour meter 2, the measurement value input from the electronic watt-hour meter 2 by the measurement value input means 21 is corrected by the measurement value correcting means 21a as described above. As a method of correction, it is also possible to apply correction to the theoretical value calculated by the theoretical value calculating means 24, rather than the measurement value input by the measurement value input means 21. However, applying correction to the theoretical value calculated by the theoretical value calculating means 24 causes the following inconvenience.

[0060] For example, if we assume that the wires on side 1 of the three-phase power supply are swapped with the wires on side 3 when connecting each wire to the P1, P2, and P3 terminals of the three-phase power supply, the measurement value of the phase-to-phase voltage input to the terminal on side 1 of the electronic watt-hour meter 2 will be mistakenly treated as the measurement value of the phase-to-phase voltage on side 1 by PC1, when it should actually be treated as the measurement value of the phase-to-phase voltage on side 3. Therefore, if a correction is applied to the theoretical value, the theoretical value of the phase-to-phase voltage on side 1 will be erroneously corrected using the measurement value of the phase-to-phase voltage on side 3.

[0061] On the other hand, in the case of applying a correction to the measurement value input by the measurement value input means 21 as in the present embodiment, even if the above-mentioned erroneous connection occurs, the measurement value of the phase-to-phase voltage input to the 1-side terminal of the electronic watt-hour meter 2 is erroneously treated as the measurement value of the phase-to-phase voltage on the 1-side by PC1, although it should be treated as the measurement value of the phase-to-phase voltage on the 3-side. However, the correction is applied to the measurement value of the phase-to-phase voltage on the 3-side that is erroneously treated as the measurement value of the phase-to-phase voltage on the 1-side. Therefore, when the correction is applied to the measurement value, no discrepancy occurs between the actual phase (phase on the 3-side) input to the 1-side terminal of the electronic watt-hour meter 2 and the phase (phase on the 3-side) to which the correction is applied by PC1. Therefore, according to the present embodiment, it is possible to apply a correct correction to the phase-to-phase voltage.

[0062] Moreover, according to the computer program for determining the wiring connection state of the electronic watt-hour meter 2 of this embodiment, the voltage phase difference θp1-p3 between two predetermined pairs of inter-phase voltages P1, P3 input from the electronic watt-hour meter 2 by the measurement value input means 21 is further compared with a predetermined voltage phase difference of 300° by the comparison means 26. The wiring connection state is specified by further referring to the comparison result by the determination means 27. Therefore, the wiring connection state that cannot be determined only by comparing the theoretical value with the corrected measurement value can be specified, and it becomes possible to determine the wiring connection state with higher accuracy.

[0063] In the above embodiment, the electronic watt-hour meter 2 is a three-phase three-wire type, but the present invention can be applied to a single-phase two-wire type or a single-phase three-wire type electronic watt-hour meter in the same manner. The measurement value in the case of a single-phase two-wire type electronic watt-hour meter can be corrected using the formula (1-1).

[0064] In addition, in the case of a single-phase three-wire electronic watt-hour meter, the measurement value can be corrected using the following formulas, dividing the cases as follows: In other words, if the measurement value of phase 1 voltage P1 between terminals P1 and P2 is 70[V] to 130[V], the corrected measurement values ​​of active power value W1 and reactive power value var1 are calculated using the following formula (10-1), with the rated voltage value VR = 100[V]. Corrected measurement value (W1, var1) = Measurement value (W1, var1) × (100 / P1) 2 …(10-1)

[0065] In addition, if the measured value of the phase 1 voltage P1 between the P1 and P2 terminals is between 140 [V] and 260 [V], it is recognized as an incorrect connection in which a 1-phase to 3-phase voltage is applied between the P1 and P2 terminals, and the corrected measured values ​​of the active power value W1 and reactive power value var1 are calculated using the following formula (10-2) with the rated voltage value VR = 200 [V]. Corrected measurement value (W1, var1) = measurement value (W1, var1) × (200 / P1) 2 …(10-2)

[0066] In addition, if the measurement value of the phase 1 voltage P1 between the P1 terminal and the P2 terminal is other than 70 [V] to 130 [V] or 140 [V] to 260 [V], and if the measurement value of the voltage P1 is zero because the wiring is not connected to the P1 terminal or the P2 terminal, etc., and the calculation of equation (10-1) or (10-2) cannot be performed, the measurement value correction means 21a will not perform correction processing, as shown in the following equation (10-3). Corrected measurement value (W1, var1) = measurement value (W1, var1) ... (10-3)

[0067] In addition, if the measurement value of the phase 3 voltage P3 between the P3 terminal and the P2 terminal is 70 [V] to 130 [V], the corrected measurement values ​​of the active power value W3 and the reactive power value var3 are calculated using the following formula (11-1) with the rated voltage value VR = 100 [V]. Corrected measurement value (W3, var3) = measurement value (W3, var3) × (100 / P3) 2 …(11-1)

[0068] In addition, if the measured value of the phase 3 voltage P3 between the P3 terminals and the P2 terminals is between 140 [V] and 260 [V], it is recognized as an incorrect connection in which the voltage between phases 1 and 3 is applied between the P3 terminals and the P2 terminals, and the corrected measured values ​​of the active power value W3 and reactive power value var3 are calculated using the following formula (11-2) with the rated voltage value VR = 200 [V]. Corrected measurement value (W3, var3) = measurement value (W3, var3) × (200 / P3) 2 …(11-2)

[0069] In addition, if the measurement value of the phase 3 voltage P3 between the P3 terminal and the P2 terminal is other than 70 [V] to 130 [V] or 140 [V] to 260 [V], and if the measurement value of the voltage P3 is zero because the wiring is not connected to the P3 terminal or the P2 terminal, etc., and the calculation of equation (11-1) or (11-2) cannot be performed, correction processing is not performed by the measurement value correction means 21a, as shown in the following equation (11-3). Corrected measurement value (W3, var3) = measurement value (W3, var3) ... (11-3)

[0070] Also, in the above embodiment, a case has been described in which the basic data acquiring means 23 acquires, as basic data, the apparent power values ​​PI1, PI3 and the phase differences θ1, θ3 calculated based on the rated capacity and phase angle of the simulated load 3 input to the load value input means 22. However, the basic data acquiring means 23 may be configured to calculate and acquire the basic data from the corrected measurement values ​​of the simulated load 3 or the actual load 6 input by the measurement value input means 21 and corrected by the measurement value correcting means 21a.

[0071] In this case, the basic data acquisition means 23 calculates basic data of apparent power values ​​PI1, PI3 and phase differences θ1, θ3 between each of two predetermined pairs of phases from the 1-side and 3-side active power values ​​W1, W3 and the 1-side and 3-side reactive power values ​​var1, var3 measured by the electronic watt-hour meter 2 and corrected by the measurement value correction means 21a as follows: That is, the basic data of the apparent power values ​​PI1, PI3 are calculated from the corrected measurement values ​​by the following equations (12-1) and (12-2). PI1=(W1 2 +var1 2 ) 1 / 2 …(12-1) PI3=(W3 2 +var3 2 ) 1 / 2 …(12-2)

[0072] In addition, basic data for each of the phase differences θ1, θ3 is calculated from the following equations (13-1) and (13-2) using the corrected measurement values ​​corrected by the measurement value correcting means 21a, taking into account a phase shift of 30° in the three-phase, three-wire system. θ1=cos -1 (W1 / PI1)-30° …(13-1) θ3=cos -1 (W3 / PI3)+30° …(13-2)

[0073] However, when the signs of var1 and var3 measured by the electronic power meter 2 are - (negative), the basic data of each phase difference θ1 and θ3 are calculated from the following equations (14-1) and (14-2) using the corrected measurement values ​​corrected by the measurement value correction means 21a. θ1=-cos -1 (W1 / PI1)-30° …(14-1) θ3=-cos -1 (W3 / PI3)+30° …(14-2)

[0074] According to this configuration, basic data is acquired by calculation of the basic data acquisition means 23 from the corrected measurement value of the simulated load 3 or the actual load 6 corrected by the measurement value correction means 21a. According to this configuration, this basic data is a value corresponding to the rated voltage value VR of the electronic watt-hour meter 2. Therefore, according to this configuration, the corrected measurement value corrected by the measurement value correction means 21a is compared with the theoretical value defined in the table created by the table creation means 25, thereby achieving the same effects as those of the above embodiment. [Explanation of symbols]

[0075] 1...Personal computer (PC) 2…Electronic electricity meter 2a...Display section 2b…Terminal section 3…Simulated load 4…Sensor 5…Cable 6…Actual load 11...ROM 12…RAM 13…CPU

Claims

1. Computer, an information input means for inputting a phase wire system and a rated voltage value of the electronic watt-hour meter as meter information; and, when the phase wire system of the electronic watt-hour meter input by said information input means is a single-phase three-wire system, a measurement value input means for inputting active power values ​​and reactive power values ​​measured by the electronic watt-hour meter for each interphase between a neutral line and each voltage line of a three-wire single-phase power source as measurement values, and interphase voltages of 70 [V] to 130 [V] or 140 [V] to 260 [V] between said each phase as voltage measurement values; a measurement value correcting means for correcting the measurement value to a corrected measurement value corresponding to a rated voltage value of 100[V] of the electronic watt-hour meter based on the voltage measurement value when the phase-to-phase voltage is 70[V] to 130[V], and for correcting the measurement value to a corrected measurement value corresponding to a rated voltage value of 200[V] of the electronic watt-hour meter based on the voltage measurement value when the phase-to-phase voltage is 140[V] to 260[V]; a load value input means for inputting a rated capacity and a phase angle of a dummy load to be connected to the electronic watt-hour meter; a basic data acquiring means for acquiring as basic data an apparent power value between the phases and a phase difference of a current relative to a phase voltage, the apparent power value and the reactive power value between the phases being determined based on a rated capacity and a phase angle of the simulated load inputted to the load value input means; a theoretical value calculating means for calculating, as theoretical values, the active power value and the reactive power value between the phases in each connection state of wiring connected to an electronic watt-hour meter from the basic data acquired by the basic data acquiring means; a table creating means for creating a table defining a relationship between the theoretical value calculated by the theoretical value calculating means and each connection state of the wiring; a comparing means for comparing the corrected measured value of the value corrected by the measured value correcting means with the theoretical value defined in the table created by the table creating means; and a determining means for determining the theoretical value having a value closest to the corrected measured value from a comparison result of the comparing means, and specifying the connection state of the wiring corresponding to the determined theoretical value. This is a program for determining the wiring connection status of an electronic electricity meter to enable it to function as a

2. Computer, An information input means for inputting a phase wire system and a rated voltage value of an electronic watt-hour meter provided separately from the computer as meter information, and when the phase wire system of the electronic watt-hour meter input by the information input means is a single-phase three-wire system, the phase-to-phase voltage of 70 [V] to 130 [V] or 140 [V] to 260 [V] between each of the phases is measured by the electronic watt-hour meter for each phase between the neutral line and each voltage line of a three-wire single-phase power source and the active power value and reactive power value output from the external communication port of the electronic watt-hour meter as the measurement value. a measurement value input means for inputting a voltage measurement value from the external communication port via a sensor; a measurement value correction means for correcting the measurement value to a corrected measurement value corresponding to a rated voltage value of 100 [V] of the electronic watt-hour meter based on the voltage measurement value when the phase-to-phase voltage is 70 [V] to 130 [V], and for correcting the measurement value to a corrected measurement value corresponding to a rated voltage value of 200 [V] of the electronic watt-hour meter based on the voltage measurement value when the phase-to-phase voltage is 140 [V] to 260 [V]; and a theoretical value calculation means for calculating, as theoretical values, the active power value and the reactive power value between each of the phases in each connection state including a normal connection state and an erroneous connection state of wiring connected to a terminal portion of the electronic watt-hour meter from the basic data obtained by the basic data acquisition means; a table creation means for creating a table that specifies the relationship between the theoretical value calculated by the theoretical value calculation means and each connection state of the wiring; a comparison means for comparing the corrected measurement value of the value corrected by the measurement value correction means with the theoretical value specified in the table created by the table creation means; and a determination means for determining, from a comparison result of the comparison means, the theoretical value having a value closest to the corrected measurement value, and specifying, in accordance with the determined theoretical value, the connection state of the wiring connected to the terminal portion when the electronic watt-hour meter is installed, as either a normal connection state or an erroneous connection state. This is a program for determining the wiring connection status of an electronic electricity meter to enable it to function as a

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