JP2004085413A - Measuring instrument for multi-circuit electric power - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate setting for every measuring channel. <P>SOLUTION: This multi-circuit electric power measuring instrument for measuring electric power consumptions of a plurality of load equipments connected to a distribution feeder 6 is provided with a CT 4 for detecting a current flowing from the each feeder 6 connected to the load equipment to supply a current signal corresponding to the current, and a measuring unit 3 provided in each of the plurality of load equipments, supplied with a voltage signal 36 from the each distribution feeder 6 and supplied with the current signal from the CT 4. Each of the plurality of measuring unit 3 is provided with an electric power computing part 31 for computing the electric power consumption of the load equipment, based on the current signal corresponding to the current flowing in the load equipment detected by the CT 4, and based on the voltage signal 36 supplied from the distribution feeder 6, and a non-volatile memory 33 for storing each of rated information in the CT 4. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a measurement device that can measure the power consumption of a plurality of channels of load equipment with one device.
[0002]
[Prior art]
Interest in energy saving has been increasing due to stricter regulations on energy consumption of factories and buildings. In order to save energy, it is important to replace power equipment, air conditioning, lighting equipment, etc. with energy-efficient ones, and to know where and how energy is currently used for effective improvement. It is a point.
Conventionally, in power energy, demand monitoring at a power receiving end from a power company has been mainly performed, but from the above circumstances, it is necessary to measure power consumption of individual load devices.
For such applications, recently, a multi-circuit power measurement device that measures the power consumption of a load device having a plurality of channels by one device has begun to be used.
[0003]
[Problems to be solved by the invention]
However, in the conventional multi-circuit power measuring device, when measuring the power of a plurality of measurement channels, it is necessary to perform an operation for setting a rating such as a current, a voltage, and a phase-wire system for each measurement channel. Was. Furthermore, there is a problem that every time a measurement channel is added, it is necessary to perform an operation for setting a rating such as a current, a voltage, or a phase-wire system.
In view of the above problems, an object of the present invention is to provide a multi-circuit power measuring device capable of eliminating settings for each measurement channel.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, a multi-circuit power measuring device according to the present invention is a multi-circuit power measuring device that measures the electric energy of a plurality of load devices connected to a power distribution system. A current detection unit that detects a current flowing from the system to the load device and supplies a current signal corresponding to the current; and a voltage signal provided from each of the plurality of load devices and connected to the load device. And a measurement unit to which a current signal from the current detection unit is supplied, wherein each of the plurality of measurement units corresponds to a current flowing through the load device detected by the current detection unit. Power calculating means for calculating the amount of power used by the load device based on the current signal and the voltage signal supplied from the wiring system, and a memory for storing rating information of each of the current detecting units. Characterized by comprising a means.
According to the multi-circuit power measuring device of the present invention, since the storage unit for storing rating information is provided in each measuring unit of the multi-circuit power measuring device, setting for each measurement channel can be eliminated.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a multi-circuit power measuring device according to the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram showing a multi-circuit power measurement device according to the present invention. The multi-circuit power measuring device shown in FIG. 1 measures the power consumption of a plurality of load devices 5a to 5c connected to a power distribution feeder 6 which is a distribution system, and includes a main unit 1 and a plurality of load devices 5a. -5c are connected to a plurality of measurement units 3a-3c provided in a one-to-one correspondence via a transmission line 2, and CT4a-4c for detecting a current flowing through each system is connected to each measurement unit. . The data measured by each of the measurement units 3a to 3c is downloaded to the main unit 1 by communication using the transmission line 2, and stored and displayed.
In this example, the case where only three measurement units are provided is described. However, the present invention is not limited to this, and two or four or more measurement units may be provided.
[0006]
FIG. 2 is a configuration diagram of the measurement unit in FIG.
The measuring unit 3 is connected to a CT 4 that detects a current flowing through the power distribution feeder 6 connected to the load device 5, and a different CT 4 is connected depending on rating information (for example, rated current) of each load device 5. A non-volatile memory 33 is built in the measuring unit 3, and rating information of the CT 4 is set at the time of shipment and stored in the non-volatile memory 33.
[0007]
When the measuring unit 3 is installed, the rating information stored in the non-volatile memory 33 via the communication control circuit 34 and the CPU 32 is communicated from the main unit 1 via the connector 35 connected to the transmission path 2. After reading the data, the main unit 1 automatically sets the rating.
On the other hand, when the measurement of the power usage is started, the power calculation unit 31 measures the power usage based on the voltage signal 36 supplied from the power distribution feeder 6 to the measurement unit and the current signal detected by CT4. The communication control circuit 34 is switched so as to transmit the measurement signal to the main unit 1 by communication, and the data of the power consumption is transmitted to the main unit 1 via the transmission path 2.
Further, when the load device 5 is added and the measurement units 3 and CT4 are added accordingly, the main unit 1 similarly reads the rating information of each measurement unit 3 by communication and automatically sets the rating.
[0008]
As described above, according to the multi-circuit power measuring device according to the above-described embodiment, the rating information of each CT is stored in the non-volatile memory inside each measuring unit, and each of the CTs is stored in the non-volatile memory by communication. Since the rating information is read and the rating is automatically set in the main unit, it is not necessary to set the rating for each measurement channel.
[0009]
【The invention's effect】
According to the above invention, since the storage unit for storing the rating information is provided for each measurement unit of the multi-circuit power measurement device, the setting for each measurement channel can be eliminated. Further, it is possible to easily add a measuring unit without setting a rating on the main unit.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a multi-circuit power measurement device according to the present invention.
FIG. 2 is a configuration diagram showing a measurement unit of the multi-circuit power measurement device according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Main unit, 2 ... Transmission path, 3a-3c ... Measurement unit, 4a-4c ... Current transformer CT, 5a-5c ... Load equipment, 6 ... Distribution feeder, 31 ... Power calculation unit, 32 ... CPU, 33 ... Non-volatile Memory, 34 communication control circuit, 35 connector, 36 voltage signal

Claims (2)

In a multi-circuit power measuring device for measuring the electric energy of a plurality of load devices connected to a distribution system, a current signal corresponding to the current is detected by detecting a current flowing from each wiring system connected to the load device to the load device. And a current detection unit that supplies a voltage signal from each wiring system connected to the load device and a current signal from the current detection unit. A measurement unit, wherein each of the plurality of measurement units is configured to detect a corresponding one of the load devices based on a current signal corresponding to a current flowing through the load device detected by the current detection unit and a voltage signal supplied from the wiring system. A multi-circuit power measuring device, comprising: a power calculating means for calculating the amount of power used; and a storage means for storing rating information of each of the current detecting units. In a multi-circuit power measuring device for measuring the electric energy of a plurality of load devices connected to a distribution system, a current signal corresponding to the current is detected by detecting a current flowing from each wiring system connected to the load device to the load device. And a current detection unit that supplies a voltage signal from each wiring system connected to the load device and a current signal from the current detection unit. A measurement unit, and a main unit that accumulates data from each of the measurement units, wherein each of the plurality of measurement units includes a current signal corresponding to a current flowing through the load device detected by the current detection unit and the current signal. Power calculating means for calculating the power usage of the load device based on a voltage signal supplied from a wiring system, and a memory for storing rating information of each of the current detecting units. And means, the body unit, multi-circuit power measurement apparatus characterized by comprising setting means for the nominal setting by rating information stored in the storage means of the measurement unit at the time of installation of the measuring unit.

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