JP2001281274A - Consumed power measuring system and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a consumed power measuring system which permits centralized control at one location at a lower cost. SOLUTION: Current value alone flowing to equipment 5 is detected by a current sensor 7. The calculation of consumed power uses the current value and a voltage value and a power factor inputted by an operator from an information processor 6 through a network. This eliminates the need for constant measurement of a voltage element thereby dispensing with a voltage detector and also permits the measurement of consumed power by one measuring tool 4 for a plurality of distribution systems different in voltage value as well.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to measurement of energy consumption, and to a power consumption measurement system in which simple calculation is applied to calculation of power consumption.

[0002]

2. Description of the Related Art In recent years, environmental awareness has increased. Also, with the enforcement of the revised Energy Conservation Law in April 1999, reduction of power consumption in factories and plants has been promoted. In factories and plants, in order to maintain and improve environmental management and energy saving measures, it is necessary to grasp the power usage status of each device and equipment in the facility such as machine tools. For this reason, a power consumption measurement system is installed to measure the power used by each device, and to monitor the integrated value of the power consumption at each time and every day and month.

FIG. 8 is a diagram showing a measuring method in a conventional power consumption measuring system. In the measurement of integrated power by the conventional power consumption measurement system, a current detector, voltage detector and measurement tool are installed for each distribution system to be measured, and the voltage, current, power factor, etc. of the power line to each device are measured. Measure,
The power consumption is calculated based on these data, and the results are integrated. In the case of FIG. 8, a circuit breaker 102 and a transformer 103 are provided for each distribution system 101, and a current for detecting a current flows between the transformer 105 and a device 105 such as a machine tool connected to the secondary side of the transformer 103. Detector CT and voltage detector P for detecting voltage
A measurement tool 104 for integrating and summing up the power consumption of the device 105 from T and the detection results of these detectors is provided. Then, the measurement tool 104 calculates the power factor from the current value and the voltage value detected by the current detector CT and the voltage detector PT, and integrates and sums up the power consumption from these.
Is monitoring power consumption.

[0004]

In a factory or a plant,
Operating devices have various input voltages, and a distribution system having a plurality of voltage values is prepared. For example, in FIG. 8, the power distribution system 101-1 has 200V, the power supply 101-2 has 400V,
1-m is a power distribution system that supplies 6.6 kV of power.

[0005] Even in a distribution system having the same voltage value, the secondary voltage of the transformer does not have the same voltage value due to various reasons. For example, the output of the transformer 103-1 on the secondary side should be 200V, but there is a variation such as 193V or 205V. The power factor is also generally considered to fluctuate greatly. Therefore, in the above-described conventional power consumption measurement system, each distribution system 1
The voltage value must be measured every 01-1 to 101-m, and therefore, a measurement tool 104 must be installed for each distribution system. For this reason, the measurement system becomes large-scale, and the cost of the equipment is increased. In addition, the measurement tools 104 are scattered in the facility, and the human cost increases to collect data from them.

[0006] In view of the above problems, an object of the present invention is to provide a power consumption measuring system which enables low-cost, centralized management at one place.

[0007]

According to a first aspect of the present invention, there is provided a power consumption measuring system comprising: a voltage value / power factor input unit;
A plurality of current value detection means and power value calculation means are provided. The voltage value / power factor input means receives input of a voltage value and a power factor from an operator.

[0008] The current value detecting means detects a current value flowing through the object to be measured. The power value calculation means obtains a power consumption value for each of the measurement objects from the current value detected by the current value detection means and the input voltage value and power factor. According to the power consumption means of the first aspect, since the power consumption of each measurement target is obtained from the voltage value and the power factor input by the operator to each measurement target, it is necessary to measure the voltage element. There is no. Therefore, the configuration can be reduced in size and simplified.

A power consumption measurement system according to a second embodiment of the present invention includes a voltage value / power factor storage unit instead of the voltage value / power factor input unit in the first embodiment. Voltage value
The power factor storage means stores the voltage value and the power factor. Further, in the case of this configuration, the power value calculation means obtains the power consumption value of each of the measurement objects from the current value detected by the current value detection means and the voltage value and the power factor stored in the voltage value / power factor storage means.

In the second embodiment, the voltage value / power factor storage means stores a plurality of voltage values and power factors, and the power value calculation means stores an operator value among the plurality of power values and power factors. The power consumption value can be obtained by using the voltage value and the power factor specified by the above.

In this configuration, when the operator inputs, for example, the name of the device to be measured, the power value calculation means calculates the corresponding voltage value and power factor stored in the voltage / power factor storage means. The power consumption value can be obtained by using this. Further, the power consumption measuring system according to the third embodiment of the present invention is premised on a configuration including an information processing device and a plurality of measurement tools connected to the information processing device via a network.

The information processing apparatus includes a voltage value / power factor input means for receiving an input of a voltage value and a power factor as setting information for an object to be measured from an operator; A transmission unit for transmitting the measurement result to the tool; and a measurement result storage unit for storing a measurement result from the measurement tool.

Each of the measuring tools includes a plurality of current value detecting means for detecting a current value flowing through the measuring object, and a power value of the measuring object based on the current value detected by the current value detecting means and the setting information. Power calculating means for calculating the power consumption; and a measurement result transmitting means for transmitting the power consumption value as a measurement result to the information processing apparatus.

According to the third configuration, when the operator inputs the setting information from the information processing device, the setting information is set in the corresponding measurement tool via the network. The measurement results obtained by each measurement tool are collected in the information processing device via a network.

Further, in the power consumption measuring system according to the present invention, setting information can be set and input for each measurement object. Therefore, if, for example, an average value or the like at a specific time measured precisely is used as the setting information, the accuracy can be improved. Can be measured.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In the power consumption measurement system of the present embodiment, it is only the current value that is actually measured for the distribution system to be measured, and the measured value of the current and the voltage value and the power factor input in advance are used. Deriving power consumption.

FIG. 1 is a diagram showing a simple measuring method in the power consumption measuring system according to the present embodiment. In the measurement system according to the present embodiment, what is directly measured from the power distribution system is only the current value flowing through the power distribution system 1 that supplies power to the devices 5 and the equipment to be monitored. Therefore, the present system includes a current sensor 7 including a plurality of current detectors CT and a converter 71 installed on each measurement target,
One to a plurality of measurement tools 4 having a plurality of connection ports for connecting the current sensor 7 (the configuration having a plurality of measurement tools 4 will be described later), and an information processing device 6 connected to the measurement tool 4 via a network. Be composed.
In the system shown in the figure, only the current value is detected without detecting the voltage value. Therefore, even if the voltage levels are different, the measurement of a plurality of power distribution systems can be performed by one measurement tool 4.

In the case of FIG. 1, the distribution systems 1-1, 1-2,. . For 1-m, a current sensor 7 is installed on the secondary side of the transformer 3 to detect a current value flowing to each device 5-1 to 5-m to be monitored.
Then, from the detection result and the voltage value and the power factor input and set in advance from the information processing device 6 via the network,
The measurement tool 4 calculates the integrated value of the power consumption by the following equation.

Power amount = measured current × voltage set value × power factor set value × operating time The measuring tool 4 calculates the integrated and measured results at regular intervals or at a timing specified by the information processing device 6. Transfer to The information processing device 6 stores and manages the power consumption of each device.

In the present embodiment, the power consumption and the power consumption are calculated by the measurement tool 4 using the fixed values input by the operator from the information processing device 6 in advance. The voltage value and the power factor fluctuate greatly when viewed as an instantaneous value, but are based on an experimental result by the present applicant that the average value at a specific time takes a stable value.

FIG. 2 is a diagram showing the power load characteristics of the molding machine measured every 5 minutes. In general, it is considered that the power factor of equipment used in a factory or the like varies greatly. However, as can be seen from FIG. 2, the power factor changes instantaneously, but becomes a stable value when an average value of about one hour is taken.
In the figure, the instantaneous value of the power factor fluctuates greatly between 0.69 and 0.87. However, when the average value is taken, it is 0.
It can be seen that the value is almost stable around 73 to 0.75.

The voltage value also fluctuates instantaneously, for example, when the device 5 is started, but when the average value is taken, there is no large fluctuation. In the case of the figure, if the average value of the three phases is taken for about one hour, it will be a substantially constant value per 0.260 kWh / Ah. As described above, the voltage value and the power factor may fluctuate instantaneously, but it can be seen that the average value takes a substantially constant value in about one hour. In this embodiment, focusing on this point,
A voltage value and a power factor are measured and obtained in advance by a precision device for each measurement object such as a device or facility, and these values are set and input to the input measurement tool 4 from the information processing device 6 in advance.

Although the method of calculating power consumption by this simple calculation cannot be used when a high-precision measurement value is required, sufficient accuracy can be obtained as a measure of power consumption in each system or as trend data. However, there is no problem if the usage does not require high precision as in the present system. In addition, by using a value precisely measured in advance for each device to be measured as the set value, it is possible to perform measurement with high accuracy to some extent. Furthermore, precise measurement can be performed by finely changing the conditions at the time of measurement, and high-precision measurement can be performed by properly using the results.

By adopting this simple calculation, the system does not need to measure the voltage element at all times, so that there is no need to install a voltage detector (PT). In addition, since only the current value is measured, the measurement tools 4 that have been required for each monitoring target can be combined into one for a plurality of distribution systems having different voltage values. In addition, since a voltage value and a power factor can be set for each device to be measured, a highly accurate measurement result can be obtained as a measurement value of an integrated value at a specific time.

FIG. 3 is an example of a screen on which the operator inputs settings from the information processing device 6 to the present system. The operator inputs setting information on each device 5 and equipment to be monitored from the screen of the information processing device 6 as shown in FIG. In this case, in order to specify the setting object, first, a unit number or a unit name for specifying the measurement tool 4 (when there are a plurality of measurement tools) and a port number of the measurement tool 4 are input as input elements. Next, the name of the device or equipment to be measured by the port, the type (measurable range) of the current sensor 7 connected to the port, the power output type of the distribution system (single-phase two-wire, Phase 3 line, balanced 3 phase 3 line, etc.), whether or not data from the port is to be collected, and a voltage setting value and a power factor setting value for calculating power consumption as a setting value are input. The setting information for each device or equipment to be measured is stored in a database in advance and stored in the information processing device 6, and the operator inputs, for example, equipment 1 as the equipment name from the setting screen in FIG. When a target device or facility is specified, the circuit system of the corresponding distribution system and the voltage set value and the power factor set value measured and stored in advance may be automatically input.

When the operator has finished inputting these settings from the information processing device 6 to all the devices and equipment to be measured, the setting information is transmitted to the respective measurement tools 4 via the network. The measurement tool 4 performs various settings required for measurement based on the transmission information.

Based on these settings, the measurement tool 4 obtains a measured current value from the current sensor 7 connected to each port and a power factor set value and a voltage set value set for each device to be measured. The integrated value of the power consumption is calculated for each specific time, for example, the measured value for every one hour.
Send to The information processing device 6 sequentially stores and manages the measurement data.

The measurement data of the power consumption stored in the information processing device 6 is processed into a format designated by the operator.
The information is output on the screen of the information processing device 6 or by a printer or the like. FIG. 4 is an example of a setting screen of the output format of the measurement data. The data of the measured power consumption of each device is a daily report showing the transition of each hour in the day according to the purpose of use,
It is output in the form of a monthly report showing the transition within the month and an annual report showing the transition within the year.

FIG. 4 shows an arbitrary date (February 1, 1999).
Is a screen for designating the output of a daily report for the equipments 1 to 8 monitored by the measurement tool unit A. The operator first outputs information in the form of a daily report, a monthly report,
From the screen 21 for selecting the annual report, the user selects the daily report 22 specifying the day, and then inputs and specifies the date to be output from the day specification screen 23. Then, after specifying one or a plurality of facilities for outputting power consumption data from the facility selection screen 24 by the name of the monitoring measurement tool and the facility name, a graph or a report is designated as a display format.

FIG. 5 is a diagram showing an output example when a form is designated as a display format from the screen 24 of FIG. 4, the integrated value of the power consumption and the maximum value, the minimum value, the average value, and the total value of the power consumption for each of the facilities 1 to 8 designated in FIG. Note another display by electric energy terms (kWh) As the display manner of power consumption, power rate, CO ₂ consumption, include oil consumption in terms, it can be freely changed by the specification of the operator.

FIG. 6 is a diagram showing an output example when a graph is designated as a display format from the screen 24 of FIG. In the case of the figure, the integrated value of the power consumption is displayed in a line graph for each time of the facilities 1 to 8 specified in FIG. 4, and the maximum value, the minimum value, and the average value of the integrated value for each hour of the power consumption are displayed. And the total value are displayed in a form. The type of the graph can be freely changed according to the designation of the operator, such as a line graph and a bar graph.

FIG. 7 is a diagram showing a configuration of a power consumption measurement system having a plurality of measurement tools 4. In the measurement system according to the present embodiment, basically, the power consumption can be measured for all the monitoring targets with only one measurement tool 4. However, if there are many objects to measure,
In general, the measurement is not performed by one measurement tool 4 but distributed to a plurality of measurement tools 4 for measurement. In addition, when the measurement targets are dispersedly arranged in a wide facility, or when the respective measurement targets are distributed and installed in different buildings or a plurality of floors, the power consumption measurement system includes a plurality of measurement tools 4.

FIG. 7 shows an example of the configuration in such a case. A plurality of measurement tools 4-1 to 4-n are connected to a network 8
Is connected to the information processing device 6 via the. In the case of this configuration, the setting of the setting information such as the voltage set value and the power factor set value for each measurement target to each of the measurement tools 4-1 to 4-n is performed by the measurement tool 4 whose operation is set from the information processing device 6. Is specified and the setting information is transmitted via the network 8. Each of the measurement tools 4-1 to 4-n transmits a measurement result of the power consumption of the plurality of devices 5 monitored by itself to the information processing device 6 at a specific cycle, and the information processing device 6 transmits these data. Save and manage.

As described above, in the configuration of FIG.
The setting information is set from the information processing device 6 via the network 8, and the measurement results by the respective measurement tools 4 are accumulated in the network 6 via the network 8, so that the setting is changed as in the conventional system. When collecting and collecting measurement results, there is no need to change settings or collect measurement data around each measurement tool dispersed in the facility.

By using a wireless network disclosed in Japanese Patent Application No. 11-206810 "Process Control System" by the same applicant as the present application, the measurement point can be freely changed or the system can be changed. It is possible to realize a power consumption measurement system having a flexible configuration capable of flexibly adding or changing the power consumption.

[0036]

According to the power consumption measuring system according to the present invention, it is not necessary to always measure the voltage element, so that it is not necessary to provide a voltage detector. Therefore, the configuration can be reduced in size and simplified.

Since only the current value is measured, a plurality of distribution systems having different voltage values can be monitored by one measurement tool. Further, since setting of setting information and collection of measurement results can be performed from one place, there is no need for an operator to go around the facility as in the conventional system.

As described above, according to the present invention, the system can be realized with a configuration that is less expensive than the conventional one, the human cost required for operation can be reduced, and an economical system can be constructed. Furthermore, since a voltage value and a power factor can be set for each device to be measured, a value precisely measured in advance for each measurement object can be used as a set value, and a highly accurate measurement result can be obtained. I can do it.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a power consumption measurement system according to an embodiment.

FIG. 2 is a diagram showing power load characteristics of a molding machine measured every 5 minutes.

FIG. 3 is an example of a screen on which an operator inputs settings from the information processing apparatus to the present system.

FIG. 4 is an example of a setting screen of an output format of measurement data.

FIG. 5 is a diagram showing an output example in a form format.

FIG. 6 is a diagram showing an output example in a graph format.

FIG. 7 is a diagram illustrating a configuration of a power consumption measurement system using a plurality of measurement tools.

FIG. 8 is a diagram showing a configuration of a conventional power consumption measurement system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 101 Distribution system 2, 102 Circuit breaker 3, 103 Transformer 4, 104 Measurement tool 5, 105 Equipment 6 Information processing device 7 Current sensor 8 Network

Claims (7)

[Claims] 1. A voltage / power factor input means for receiving an input of a voltage value and a power factor from an operator; a plurality of current value detecting means for detecting a current value flowing to a measurement object; A power consumption measuring system, comprising: a detected current value; and a power value calculating means for calculating a power consumption value for each of the measurement objects from the input voltage value and power factor. 2. A voltage / power factor storage means for storing a voltage value and a power factor; a plurality of current value detection means for detecting a current value flowing through a measurement object; and a current value detected by the current value detection means. A power value calculating means for calculating a power consumption value of each of the measuring objects from a voltage value and a power factor stored in a voltage value / power factor storing means. 3. The voltage value / power factor storage means stores a plurality of voltage values and power factor, and the power value calculation means stores a voltage value designated by an operator from the plurality of power values and power factor. The power consumption measurement system according to claim 2, wherein the power consumption value is obtained using a power factor. 4. A power consumption measurement system comprising an information processing device and a plurality of measurement tools connected to the information processing device via a network, wherein the information processing device is configured to set a measurement target by an operator. A voltage value / power factor input unit that receives input of a voltage value and a power factor as information; a transmitting unit that transmits the setting information to a measurement tool that is measuring the measurement target; and stores a measurement result from the measurement tool. A plurality of current value detecting means for detecting a value of a current flowing through the measurement object; anda measuring object based on the setting value and the current value detected by the current value detecting means. Power value calculating means for calculating the power consumption value of the information processing apparatus, and measurement result transmitting means for transmitting the power consumption value to the information processing apparatus as the measurement result. Power consumption measurement system that. 5. The power consumption measurement system according to claim 1, wherein an average value at a specific time is used as the voltage value and the power factor. 6. The power consumption of a measuring object is detected from a value of a current flowing through the measuring object, and a power consumption value of the measuring object is obtained from the detected current value and a voltage value and a power factor set and input by an operator. Measurement method. 7. The power consumption measuring method according to claim 6, wherein an average value at a specific time is used as the voltage value and the power factor.