JP3603876B2 - Weighing device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a measuring device for measuring electric power.
[0002]
[Prior art]
In FIG. 5, reference numeral 72 denotes a transformer, 73 denotes an instrument transformer (hereinafter, referred to as PT), and 74 denotes a current transformer (hereinafter, referred to as CT), all of which are connected to an AC power line. 75 is a watt hour meter with a transmitter connected to the outputs of the PT 73 and CT 74, 76 is a power pulse input unit connected to the output of the watt meter 75 with the transmitter, and 77 is connected to the output of the power pulse input unit 76. The power amount pulse input metering section 78 is a demand power calculating means connected to the output of the power amount pulse input metering section 77, and is monitored by the power amount pulse input section 76, the power amount pulse input metering section 77 and the demand power calculating means 78. The device is configured.
[0003]
In this configuration, the watt hour meter 75 with the transmitter measures the amount of power based on the voltage input from the PT 73 and the current input from the CT 74, outputs a pulse corresponding to the amount of power, and outputs the power amount pulse to the demand monitoring device. Demand power calculation and demand monitoring.
[0004]
In the demand monitoring device, the electric energy pulse output from the electric energy meter 75 with the transmitting device is received by the electric energy pulse input unit 76, and the electric energy pulse input measuring unit 77 measures the electric energy. The demand power calculating means 78 calculates a demand power from the power measured by the power pulse input measuring section 77.
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional configuration, an electric energy pulse from a watt-hour meter with a transmitting device or a watt-hour meter with a transmitting device for a power company (not shown) is directly or a device for receiving a pulse (not shown). In general, the data is input to the demand monitoring device via an intermediary or the like.
[0006]
For this reason, there is no problem when using the electric energy pulse input of the electricity meter with the transmitter for transaction of the power company or the existing energy meter 75 with the transmitter, but when the electricity meter with the transmitter is not required. In addition, even when PT and CT are not required on the high pressure side, the same configuration as described above must be adopted, and there is a problem that it is not possible to flexibly respond to the actual conditions of equipment in various situations.
[0007]
An object of the present invention is to provide a weighing device that is useful in the case described above.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a measuring device of the present invention measures an electric energy from an external pulse input means for inputting an electric energy pulse output from a watt-hour meter with a transmitting device and measuring an electric energy, and a voltage and an electric current. Internal metering means, and electric energy metering selecting means for selecting one of the external pulse input metering means and the internal metering means.
[0009]
According to this weighing device, one of the external pulse input weighing means and the internal weighing means is selected by the power amount weighing selection means to perform the power calculation. As one of the operations, it is possible to use the pulse input of a watt-hour meter with a power transmitting device of a power company, and therefore, it is possible to perform management without difference from a transaction meter. As another operation, if there is an existing watt-hour meter with a transmitting device, only the pulse is input, so that the input wiring requires only two-core input wires, and installation is easy. Secondly, in the example of selecting the internal metering means, it is necessary to input the voltage and the current from the PT and the CT. In this case, however, it is not necessary to separately provide a watt-hour meter with an external transmitter. In this way, any of the power amount measuring means can be selected by the power amount measuring selecting means, and one model can flexibly cope with the above-mentioned various situations of the equipment.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described.
[0011]
(Embodiment 1)
A first embodiment of the present invention will be described with reference to FIG. In FIG. 1, reference numeral 1 denotes a transformer connected to an AC circuit, and a transformer for an instrument (hereinafter, referred to as PT) 2 and a current transformer (hereinafter, referred to as CT) 3 are connected to the AC circuit on the high voltage side of the transformer 1. Have been.
[0012]
4 is a watt hour meter with a transmitter connected to the secondary side of PT2, 5 is a power pulse input unit connected to the output of the watt meter 4 with the transmitter, and 6 is connected to the output of a power pulse input unit 5 In the power pulse input measuring unit, PT2, CT3, power meter with transmitter 4, power pulse input unit 5, and power pulse input measuring unit 6 constitute an external pulse input measuring unit.
[0013]
7 is a voltage input section connected to the secondary side of PT2, 8 is a current input section connected to the output of CT3, 9 is an internal metering section connecting the respective outputs of the voltage input section 7 and the current input section 8, and PT2 , CT3, voltage input unit 7, current input unit 8, and internal weighing unit 9 constitute a high-pressure internal weighing means. Further, reference numeral 10 denotes an electric energy metering selection unit which connects the output of the electric energy pulse input measuring unit 6 and the output of the internal measuring unit 9, and reference numeral 11 denotes a demand electric power calculating unit which connects the output of the electric energy metering selecting unit 10.
[0014]
Here, the demand monitoring device is controlled by the power amount pulse input unit 5, the power amount pulse input measuring unit 6, the voltage input unit 7, the current input unit 8, the internal measuring unit 9, the power amount measuring selecting unit 10 and the demand power calculating unit 11. Make up.
[0015]
The operation of the demand monitoring device configured as described above will be described with reference to FIG. First, only one of the external pulse input measuring means and the high voltage internal measuring means is selected by the electric energy metering selecting means 10.
[0016]
When the external pulse input measuring means is selected by the electric energy measuring and selecting means 10, the voltage from the high voltage PT2 and the current from the high voltage CT3 are input to the electric energy meter 4 with the transmitting device, and the electric energy meter 4 with the transmitting device is input. , And the measured value is transmitted as a power amount pulse, and the power amount pulse is input to the power amount pulse input unit 5 of the demand monitoring device. The input electric energy pulse is multiplied by a pulse constant for each pulse in the electric energy pulse input measuring unit 6 to measure the electric energy. Also, a pulse receiving device may be provided between the watt hour meter 4 with the transmitting device and the demand monitoring device. In this method, it is possible to use the pulse input of a watt hour meter with a transmitter for mounting of a power company, and therefore, it is possible to perform management without difference from a transaction meter. In addition, if there is an existing watt-hour meter with a transmitter, only the pulse is input, so that the input wiring requires only two-core input wires, and installation is easy.
[0017]
When the high-voltage internal measuring means is selected by the electric-power-measuring selecting means 10, the voltage from the high-voltage PT2 and the current from the high-voltage CT3 do not pass through the watt-hour meter 4 with the transmitting device, but directly enter the voltage input of the demand monitoring device. It is input to the unit 7 and the current input unit 8, respectively. The internal measuring unit 9 measures the electric power from the waveform input of the voltage and the current and measures the electric energy. In this method, it is necessary to input a voltage and a current from the high-voltage PT and the CT. In this case, however, it is not necessary to separately provide an external watt-hour meter with a transmitter.
[0018]
In addition, since the demand power calculation unit 11 performs the demand power calculation from the measured value of the power amount selected by the power amount measurement selection unit 10, any of the power amount measurement units is selected by the power amount measurement selection unit 10 and set to 1. Demand monitoring can be performed by a model demand monitoring device. For this reason, it can respond flexibly according to various equipment actual conditions.
[0019]
Note that the same effect can be obtained even if a pulse receiving device is connected between the watt hour meter 4 with the transmitting device and the demand monitoring device.
[0020]
(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIG. In FIG. 2, reference numeral 12 denotes a transformer connected to an AC electric circuit, and a transformer for an instrument (hereinafter, referred to as PT) 13 and a current transformer (hereinafter, referred to as CT) 14 are connected to the AC electric circuit on the high voltage side of the transformer 12. Have been.
[0021]
15 is a watt hour meter with a transmitter connected to the secondary side of the PT 13, 16 is a power pulse input unit connected to the output of the watt meter 15 with the transmitter, and 17 is connected to the output of the power pulse input unit 16. In the power pulse input measuring section, the PT13, CT14, the power meter 15 with the transmitting device, the power pulse input section 16, and the power pulse input measuring section 17 constitute an external pulse input measuring means.
[0022]
Two circuits, a circuit via PT18 and CT19 and a circuit via PT20 and CT21, are connected to the low-voltage side AC circuit of the transformer 12. Reference numeral 22 denotes a feeder voltage input unit connected to the secondary side of the PT 18, and reference numeral 23 denotes a feeder current input unit connected to the output of the CT 19. The output of the feeder voltage input unit 22 and the output of the feeder current input unit 23 correspond to the feeder power. It is connected to the quantity measuring section 26. Reference numeral 24 denotes a feeder voltage input unit connected to the secondary side of the PT 20, and reference numeral 25 denotes a feeder current input unit connected to the output of the CT 21, and the outputs of the feeder voltage input unit 24 and the feeder current input unit 25 are feeder power. It is connected to the quantity measuring section 27.
[0023]
The outputs of the feeder power metering section 26 and the feeder power metering section 27 are connected to a low-voltage power metering and metering section 28, and the PT18, CT19, PT20, CT21, feeder voltage input section 22, feeder current input section are provided. Reference numeral 23, a feeder power metering unit 26, a feeder voltage input unit 24, a feeder current input unit 25, a feeder power metering unit 27, and a low-voltage power metering and metering unit 28 constitute low-voltage power metering and metering means.
[0024]
Numeral 29 denotes an electric energy metering selection unit connecting the output of the electric energy pulse input measuring unit 17 and the output of the low voltage electric energy total measuring unit 28, and reference numeral 30 denotes a demand electric power calculating unit connected to the output of the electric energy metering selecting unit 29. Yes, power amount pulse input unit 16, power amount pulse input measurement unit 17, feeder voltage input unit 22, feeder current input unit 23, feeder power amount measurement unit 26, feeder voltage input unit 24, feeder current input unit 25, feeder power A demand monitoring device is constituted by the amount measuring unit 27, the low-voltage power amount total measuring unit 28, the power amount measuring selecting unit 29, and the demand power calculating unit 30.
[0025]
The operation of the demand monitoring device configured as described above will be described with reference to FIG. First, only one of the external pulse input measuring means and the low-voltage electric energy total measuring means is selected by the electric energy measuring and selecting means 29.
[0026]
When the external pulse input measuring means is selected by the electric energy metering selecting means 29, the voltage from the high voltage PT13 and the current from the high voltage CT14 are inputted to the electric energy meter 15 with the transmitting device, and the electric energy meter 15 with the transmitting device is inputted. , The measured value is transmitted as a power amount pulse, and the power amount pulse is input to the power amount pulse input unit 16 of the demand monitoring device. The input electric energy pulse is multiplied by a pulse constant for each pulse in the electric energy pulse input measuring unit 17 to measure the electric energy. Alternatively, a pulse receiving device may be provided between the watt hour meter 15 with the transmitting device and the demand monitoring device. In this method, it is possible to use the pulse input of a watt hour meter with a transmitter for mounting of a power company, and therefore, it is possible to perform management without difference from a transaction meter. In addition, if there is an existing watt-hour meter with a transmitter, only the pulse is input, so that the input wiring requires only two-core input wires, and installation is easy.
[0027]
In the case where the low-voltage power-sum total measuring means is selected by the power-quantity selecting means 29, for example, in the case of two low-voltage circuits, in the first circuit, the voltage from the low-voltage PT18 and the current from the low-voltage CT19 are fed to the demand monitoring device. In the second circuit, the voltage from the low-voltage PT 20 and the current from the low-voltage CT 21 are input to the voltage input unit 22 and the feeder current input unit 23, respectively, and the feeder voltage input unit 24 and the feeder current input unit 25 of the demand monitoring device are used. Respectively. The feeder power metering section 26 measures the feeder power from the waveform input of the voltage and current of the first circuit, and measures the feeder power. The second circuit is performed by the feeder power amount measuring unit 27 in the same manner as described above. The feeder power amounts measured by the feeder power amount measuring units 26 and 27 are all summed up by the low-voltage power amount summing and measuring unit 28, and are measured as electric power amounts. In this method, the electric energy of each low-voltage feeder is measured and the total electric power of the feeder is measured, so that the PT and CT on the high voltage side are not required.
[0028]
Further, since demand power calculation is performed by the demand power calculating means 30 from the measured value of the power quantity selected only by the power quantity measuring and selecting means 29, any power quantity measuring means is selected by the power quantity measuring and selecting means 29. Demand monitoring can be performed by a selected type of demand monitoring device. For this reason, it can respond flexibly according to various equipment actual conditions.
[0029]
Note that a pulse receiving device may be passed between the watt hour meter 15 with the transmitting device and the demand monitoring device. The number of branch circuits at low voltage may be any number.
[0030]
(Embodiment 3)
A third embodiment of the present invention will be described with reference to FIG. In FIG. 3, reference numeral 31 denotes a transformer connected to an AC circuit, and a transformer for an instrument (hereinafter, referred to as PT) 32 and a current transformer (hereinafter, referred to as CT) 33 are connected to the AC circuit on the high voltage side of the transformer 1. Have been.
[0031]
34 is a voltage input section connected to the secondary side of PT32, 35 is a current input section connected to the output of CT33, 36 is an internal measuring section connected to the voltage input section 34 and the output of the current input section 35, and PT32 and CT33. , A voltage input unit 34, a current input unit 35, and an internal measuring unit 36 constitute a high-pressure internal measuring unit. Also, two circuits, a circuit via PT37 and CT38 and a circuit via PT39 and CT40, are connected to the low-voltage side AC circuit of the transformer 31.
[0032]
41 is a feeder voltage input section connected to the secondary side of the PT 37, 42 is a feeder current input section connected to the output of the CT 38, and the output of the feeder voltage input section 41 and the output of the feeder current input section 42 are feeder electric energy. It is connected to the measuring section 45. Reference numeral 43 denotes a feeder voltage input unit connected to the secondary side of the PT 39, reference numeral 44 denotes a feeder current input unit connected to the output of the CT 40, and the output of the feeder voltage input unit 43 and the output of the feeder current input unit 44 are feeder. It is connected to the electric energy meter 46.
[0033]
The outputs of the feeder power metering units 45 and 46 are connected to the low-voltage power metering and metering unit 47, respectively, and the PT37, CT38, feeder voltage input unit 41, feeder current input unit 42, and feeder power metering unit 45 are used. , PT 39, CT 40, feeder voltage input section 43, feeder current input section 44, feeder power amount measuring section 46 and low voltage power amount total measuring section 47 constitute a low voltage power total measuring section.
[0034]
Numeral 48 denotes an electric energy metering selection unit connecting the output of the internal metering unit 36 and the output of the low-voltage electric energy total metering unit 47, and 49 denotes a demand electric power calculating unit connected to the output of the electric energy metering selecting unit 48. Input unit 34, current input unit 35, internal metering unit 36, feeder voltage input unit 41, feeder current input unit 42, feeder power amount measuring unit 45, feeder voltage input unit 43, feeder current input unit 44, feeder power amount measuring unit , A low-voltage power amount total measuring unit 47, a power amount measuring selecting unit 48 and a demand power calculating unit 49 constitute a demand monitoring device.
[0035]
The operation of the demand monitoring device configured as described above will be described with reference to FIG. First, only one of the high-pressure internal measuring means and the low-voltage electric energy total measuring means is selected by the electric energy measuring and selecting means 48.
[0036]
When the high-voltage internal measuring means is selected by the electric-power-measuring selecting means 48, the voltage from the high-voltage PT32 and the current from the high-voltage CT33 do not pass through the watt-hour meter with the transmitting device, but directly enter the voltage input section of the demand monitoring device. 34 and the current input unit 35. The internal measuring unit 36 measures the electric power from the waveform input of the voltage and the current and measures the electric energy. In this method, it is necessary to input a voltage and a current from the high-voltage PT and the CT. In this case, however, it is not necessary to separately provide an external watt-hour meter with a transmitter.
[0037]
When the low-voltage power amount summing and measuring unit is selected by the power amount measuring and selecting unit 48, for example, in the case of two low-voltage circuits, in the first circuit, the voltage from the low-voltage PT 37 and the current from the low-voltage CT 38 feed the feeder of the demand monitoring device. In the second circuit, the voltage from the low-voltage PT 39 and the current from the low-voltage CT 40 are input to the voltage input unit 41 and the feeder current input unit 42, respectively, and the feeder voltage input unit 43 and the feeder current input unit 44 of the demand monitoring device are used. Respectively. The feeder power metering section 45 measures the feeder power from the waveform input of the voltage and current of the first circuit, and measures the feeder power. The feeder power meter 46 performs the second circuit in the same manner as described above. The feeder power amounts measured by the feeder power amount measuring units 45 and 46 are all summed up by the low-voltage power amount summing and measuring unit 47 and are measured as the electric power amount. In this method, the electric energy of each low-voltage feeder is measured and the total electric power of the feeder is measured, so that the PT and CT on the high voltage side are not required.
[0038]
Further, since demand power calculation is performed by the demand power calculating means 49 from the measured value of the power quantity selected only by the power quantity measuring means selecting means 48, any power measuring means is selected by the power quantity measuring selecting means 48. Demand monitoring can be performed by a selected type of demand monitoring device. For this reason, it can respond flexibly according to various equipment actual conditions.
[0039]
The number of branch circuits at low voltage may be any number.
[0040]
(Embodiment 4)
A fourth embodiment of the present invention will be described with reference to FIG. In FIG. 4, reference numeral 50 denotes a transformer connected to an AC circuit. An AC transformer 51 (hereinafter, referred to as PT) and a current transformer (hereinafter, referred to as CT) 52 are connected to the AC circuit on the high voltage side of the transformer 50. Have been.
[0041]
53 is a watt hour meter with a transmitter connected to the secondary side of PT2, 54 is a power pulse input unit connected to the output of the watt meter 53 with the transmitter, and 55 is connected to the output of the power pulse input unit 54. In the electric energy pulse input measuring section, the PT51, CT52, the electric energy meter 53 with the transmitting device, the electric energy pulse input section 54, and the electric energy pulse input measuring section 55 constitute an external pulse input measuring means.
[0042]
Reference numeral 56 denotes a voltage input unit connected to the secondary side of the PT 51, 57 denotes a current input unit connected to the output of the CT 52, 58 denotes an internal weighing unit connecting the respective outputs of the voltage input unit 56 and the current input unit 57. , CT 52, voltage input section 56, current input section 57, and internal weighing section 58 constitute high-pressure internal weighing means. Two circuits, a circuit via PT59 and CT60 and a circuit via PT61 and CT62, are connected to the low-voltage side AC electric circuit of the transformer 50.
[0043]
63 is a feeder voltage input section connected to the secondary side of the PT 59, 64 is a feeder current input section connected to the output of the CT 60, and the output of the feeder voltage input section 63 and the output of the feeder current input section 64 are the feeder power. It is connected to the quantity measuring section 67. 65 is a feeder voltage input unit connected to the secondary side of the PT 61, 66 is a feeder current input unit connected to the output of the CT 62, and the output of the feeder voltage input unit 65 and the output of the feeder current input unit 66 are feeder power metering. It is connected to the section 68.
[0044]
Outputs of the feeder power metering section 67 and the feeder power metering section 68 are connected to a low-voltage power metering and metering section 69, and are provided with PT59, CT60, PT61, CT62, feeder voltage input section 63, and feeder current input section. The low-voltage power amount metering unit 64 comprises the feeder power metering unit 67, the feeder voltage input unit 65, the feeder current input unit 66, the feeder power metering unit 68, and the low-voltage power metering unit 69.
[0045]
Reference numeral 70 denotes an electric energy metering selection unit which connects the output of the electric energy pulse input measuring unit 55, the output of the internal measuring unit 58, and the output of the low voltage electric energy total measuring unit 69, and 71 denotes the output of the electric energy metering selecting unit 70. The connected demand power calculating means is a power amount pulse input unit 54, a power amount pulse input measuring unit 55, a voltage input unit 56, a current input unit 57, an internal measuring unit 58, a feeder voltage input unit 63, and a feeder current input unit 64. Demand monitoring by feeder power metering unit 67, feeder voltage input unit 65, feeder current input unit 66, feeder power metering unit 68, low voltage power meter summing meter 69, power meter selection unit 70 and demand power calculation unit 71 Make up the device.
[0046]
The operation of the demand monitoring device configured as described above will be described with reference to FIG. First, only one of the external pulse input measuring means, the high voltage internal measuring means, and the low voltage electric energy total measuring means is selected by the electric energy measuring and selecting means 70. When the external pulse input measuring means is selected by the electric energy measuring and selecting means 70, the voltage from the high voltage PT 51 and the current from the high voltage CT 52 are input to the electric energy meter 53 with the transmitting device, and the electric energy meter 53 with the transmitting device is supplied. , And the measured value is transmitted as a power amount pulse, and the power amount pulse is input to the power amount pulse input unit 54 of the demand monitoring device. The input electric energy pulse is multiplied by a pulse constant for each pulse in the electric energy pulse input measuring section 55 to measure the electric energy. Also, a pulse receiving device may be provided between the watt hour meter 53 with the transmitting device and the demand monitoring device. In this method, it is possible to use the pulse input of a watt hour meter with a transmitter for mounting of a power company, and therefore, it is possible to perform management without difference from a transaction meter. In addition, if there is an existing watt-hour meter with a transmitter, only the pulse is input, so that the input wiring requires only two-core input wires, and installation is easy.
[0047]
When the high-voltage internal metering means is selected by the electric energy metering selecting means 70, the voltage from the high-voltage PT 51 and the current from the high-voltage CT 52 do not pass through the watt-hour meter 53 with the transmitting device, but directly enter the voltage input of the demand monitoring device. The signals are input to the unit 56 and the current input unit 57, respectively. The internal measuring unit 58 measures the electric power from the voltage input of the voltage and the current and measures the electric energy. In this method, it is necessary to input a voltage and a current from the high-voltage PT and the CT. In this case, however, it is not necessary to separately provide an external watt-hour meter with a transmitter.
[0048]
When the low-voltage electric power summing and measuring means is selected by the electric energy measuring and selecting means 70, for example, in the case of two low-voltage circuits, in the first circuit, the voltage from the low-voltage PT 59 and the current from the low-voltage CT 60 are fed to the demand monitoring device feeder. In the second circuit, the voltage from the low-voltage PT 61 and the current from the low-voltage CT 62 are input to the voltage input unit 63 and the feeder current input unit 64, respectively, and the feeder voltage input unit 65 and the feeder current input unit 66 of the demand monitoring device are used. Respectively. The feeder power amount measuring section 67 measures the feeder power from the voltage and current waveform inputs of the first circuit, and measures the feeder power amount. The second circuit is performed in the feeder power amount measuring section 68 in the same manner as described above. The feeder power amounts measured by the feeder power amount measuring units 67 and 68 are all summed up by the low-voltage power amount summing and measuring unit 69 and measured as an electric power amount. In this method, the electric energy of each low-voltage feeder is measured and the total electric power of the feeder is measured, so that the PT and CT on the high voltage side are not required.
[0049]
Furthermore, since the demand power calculation is performed by the demand power calculation means 71 from the measured value of the power quantity selected only by the power quantity measurement selection means 70, any of the power quantity measurement means is selected by the power quantity measurement selection means 70. Since demand monitoring can be performed by a single type of demand monitoring device, it is possible to flexibly respond to equipment conditions in various situations.
[0050]
Note that a pulse receiving device may be provided between the watt hour meter 53 with the transmitting device and the demand monitoring device. The number of branch circuits at low voltage may be any number.
[0051]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the weighing apparatus which can respond flexibly to various installations can be provided.
[Brief description of the drawings]
FIG. 1 is a block diagram of a weighing device according to a first embodiment of the present invention. FIG. 2 is a block diagram of a weighing device according to a second embodiment of the present invention. FIG. 3 is a third embodiment of the present invention. FIG. 4 is a block diagram of a weighing device according to a fourth embodiment of the present invention. FIG. 5 is a block diagram of a weighing device in a conventional example.
1, 12, 31, 50 Transformer 2, 13, 18, 20, 32, 37, 39, 51, 59, 61 Transformer for instrument (PT)
3, 14, 19, 21, 33, 38, 40, 52, 60, 62 Current transformer (CT)
4, 15, 53 watt-hour meter with transmitter 5, 16, 54 watt-hour pulse input unit 6, 17, 55 watt-hour pulse input metering unit 7, 34, 56 voltage input unit 8, 35, 57 current input unit 9, 36, 58 Internal metering sections 10, 29, 48, 70 Electricity metering selecting means 11, 30, 49, 71 Demand power calculating means 22, 24, 41, 43, 63, 65 Feeder voltage input sections 23, 25, 42, 44, 64, 66 Feeder current input units 26, 27, 45, 46, 67, 68 Feeder electric energy metering units 28, 47, 69 Low voltage electric energy total metering unit

Claims (1)

External pulse input measuring means for measuring the electric energy by inputting the electric energy pulse output from the electric energy meter with the transmitter, and high-pressure internal measuring means for measuring the electric energy from the measured high- voltage side voltage and current, The low-voltage power amount sum calculation means for summing the power amount to be measured from the voltage and current measured in each circuit on the low voltage side branched from the high voltage side , comprising at least two means , the external pulse input measurement means , A weighing device comprising: a high-voltage internal weighing unit ; and a power amount weighing selection unit that selects one of the low-voltage power amount sum calculation unit .

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