WO2011111569A1 - 電力計測システム、電圧計測装置、電流計測装置、および電力計測方法 - Google Patents
電力計測システム、電圧計測装置、電流計測装置、および電力計測方法 Download PDFInfo
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- WO2011111569A1 WO2011111569A1 PCT/JP2011/054622 JP2011054622W WO2011111569A1 WO 2011111569 A1 WO2011111569 A1 WO 2011111569A1 JP 2011054622 W JP2011054622 W JP 2011054622W WO 2011111569 A1 WO2011111569 A1 WO 2011111569A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
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- the present invention relates to a power measurement system, a voltage measurement device, a current measurement device, and a power measurement method, and in particular, a power measurement system, a power measurement method, and such a power measurement system for calculating power supplied to a device.
- the present invention relates to a voltage measuring device and a current measuring device used in the above.
- Patent Document 1 A system for calculating the power consumed by a device is disclosed in, for example, Japanese Patent Application Laid-Open No. 2001-281274 (Patent Document 1). According to Patent Document 1, the system detects only the value of a current flowing through a device. Then, the power consumed by the device is calculated using the detected current value, the voltage value input by the operator, and the power factor input by the operator.
- Patent Document 1 power is calculated using a voltage value input by an operator.
- the voltage value of the actual device is different from the voltage value input by the operator, it is difficult to calculate accurate power.
- a power measuring device that calculates power generally includes a voltage measuring unit that measures voltage and a current measuring unit that measures current as one device. Therefore, for example, when calculating the power supplied to a plurality of devices from one distribution board, the power is measured for each device to measure the current even though the supplied voltage is constant for each device. It was necessary to attach a device and connect the voltages of a plurality of power measuring devices. However, voltage connections are dangerous and cannot be easily performed. Also, when connecting, it is necessary to turn off the power of the device, and depending on the device, the power may not be easily turned off. Therefore, it is desirable that the voltage measurement unit and the current measurement unit are separate devices, and each current is attached to each device, and the number of attachments is reduced in voltage, so that connection is reduced as much as possible.
- the voltage measurement unit and the current measurement unit are configured as separate devices, it is necessary to notify the measured data to one side.
- it is going to calculate electric power correctly many measured data will be needed and the number of data in communication will become enormous.
- An object of the present invention is to provide a power measurement system, a power measurement method, a voltage measurement device used in such a power measurement system, and a current measurement device that can accurately calculate power with a simple configuration. .
- a power measurement system is a power measurement system including a voltage measurement device that measures a voltage and a current measurement device that measures a current.
- the voltage measurement device includes a voltage measurement unit that measures a voltage at a predetermined time interval, and a transmission unit that transmits voltage information based on the voltage measured by the voltage measurement unit to the current measurement device.
- the current measuring device is provided separately from the voltage measuring device, and current measuring means for measuring current at a predetermined time interval, receiving means for receiving voltage information from the voltage measuring device, and voltage information received by the receiving means And power calculation means for calculating power based on the current measured by the current measurement means.
- a voltage measurement device that cannot be easily attached has a reduced number of attachments
- a current measurement device calculates power.
- the power can be calculated by arbitrarily attaching it to the desired device. That is, the voltage measuring device and the current measuring device can be attached according to their convenience. Specifically, measurement of current can be performed without cutting the circuit, for example, by sandwiching a clamp on a power supply line that supplies power and detecting a magnetic field induced around the power supply line . Therefore, if only current is measured, there is no need to attach a voltage measuring device.
- the voltage measurement device transmits voltage information based on the measured voltage to the current measurement device
- the current measurement device can calculate electric power based on the measured voltage and the measured current. Further, since the voltage measuring device only needs to transmit voltage information, it is not necessary to transmit data of many measured voltages. As a result, power can be accurately calculated with a simple configuration.
- the voltage information is an approximate expression for obtaining a voltage
- the receiving means receives the approximate expression from the voltage measuring device
- the power calculating means calculates the voltage from the approximate expression received by the receiving means. Power is calculated based on the voltage calculated by the voltage calculation means and the current measured by the current measurement means.
- the voltage measurement device and the current measurement device are separately provided, it is only necessary to transmit and receive an approximate expression as voltage information. Therefore, the number of data does not become enormous in communication between the voltage measuring device and the current measuring device.
- the approximate equation, the voltage of calculating V, and a nominal voltage V a, when the angular velocity and .omega.t, is V V a cos ⁇ t.
- the voltage measurement device includes a signal transmission unit that transmits a signal for adjusting the time with the current measurement device, and the current measurement device includes a signal reception unit that receives a signal for adjusting the time from the voltage measurement device.
- the voltage calculating means obtains the voltage at the time when the current measuring device measures the current from the approximate expression based on the signal received by the signal receiving means. By doing so, even if there is a difference between the time of the voltage measuring device and the time of the current measuring device, the current measuring device can match the time of the voltage measuring device. Therefore, the voltage at the time when the current is measured can be accurately calculated from the approximate expression.
- the present invention relates to a voltage measuring device for measuring a voltage.
- the voltage measurement device is provided with voltage measurement means that measures voltage at predetermined time intervals and voltage information based on the voltage measured by the voltage measurement device, separately from the voltage measurement device, and measures the current to calculate power Transmitting means for transmitting the current to the current measuring device.
- the number of attachments can be reduced. For example, even when a plurality of current measuring devices are attached, only one is required in the voltage measuring device. Further, since the voltage measurement device transmits voltage information based on the measured voltage to the current measurement device, the current measurement device can calculate power based on the measured voltage and the measured current. Further, since the voltage measuring device only needs to transmit voltage information, it is not necessary to transmit data of many measured voltages. As a result, power can be accurately calculated with a simple configuration.
- Still another aspect of the present invention relates to a current measuring device that measures current.
- the current measuring device is provided separately from the voltage measuring device that measures the voltage, and receives current information that measures the current at a predetermined time interval and voltage information based on the measured voltage from the voltage measuring device.
- power calculating means for calculating power based on the voltage information received by the receiving means and the current measured by the current measuring means.
- a current measuring device is configured to be provided separately from the voltage measuring device, for example, the voltage measuring device that cannot be easily attached is reduced in the number of attachments, and the current measuring device is arbitrarily assigned to the device for which power is to be calculated. It can be installed to calculate power. Further, since the current measurement device transmits voltage information based on the measured voltage from the voltage measurement device, the current measurement device can calculate power based on the measured voltage and the measured current. Moreover, since only the voltage information needs to be transmitted from the voltage measuring device, it is not necessary to transmit a lot of measured voltage data. As a result, power can be accurately calculated with a simple configuration.
- the power measurement method includes a voltage measurement step for measuring a voltage at a predetermined time interval in a voltage measurement device, and voltage information based on the voltage measured in the voltage measurement step in the voltage measurement device separately from the voltage measurement device. Transmitting to the current measuring device for measuring the current being measured, the current measuring step for measuring the current at a predetermined time interval in the current measuring device, and the current measuring device for obtaining voltage information from the voltage measuring device.
- a power measurement method has a configuration in which a voltage measurement device and a current measurement device are provided separately, the voltage measurement device and the current measurement device can be attached according to their convenience.
- the voltage measurement device transmits voltage information based on the measured voltage to the current measurement device, the current measurement device can calculate electric power based on the measured voltage and the measured current. Further, since the voltage measuring device only needs to transmit voltage information, it is not necessary to transmit data of many measured voltages. As a result, power can be accurately calculated with a simple configuration.
- the power measurement system has a configuration in which the voltage measurement device and the current measurement device are separately provided.
- the power can be calculated by arbitrarily attaching to the device to be calculated. That is, the voltage measuring device and the current measuring device can be attached according to their convenience. Specifically, measurement of current can be performed without cutting the circuit, for example, by sandwiching a clamp on a power supply line that supplies power and detecting a magnetic field induced around the power supply line . Therefore, if only current is measured, there is no need to attach a voltage measuring device.
- the voltage measurement device transmits voltage information based on the measured voltage to the current measurement device, the current measurement device can calculate electric power based on the measured voltage and the measured current. Further, since the voltage measuring device only needs to transmit voltage information, it is not necessary to transmit data of many measured voltages. As a result, power can be accurately calculated with a simple configuration.
- the voltage measuring device according to the present invention is provided separately from the current measuring device, the number of attachments can be reduced. For example, even when a plurality of current measuring devices are attached, only one is required in the voltage measuring device. Further, since the voltage measurement device transmits voltage information based on the measured voltage to the current measurement device, the current measurement device can calculate power based on the measured voltage and the measured current. Further, since the voltage measuring device only needs to transmit voltage information, it is not necessary to transmit data of many measured voltages. As a result, power can be accurately calculated with a simple configuration.
- the current measurement device is provided separately from the voltage measurement device, for example, the voltage measurement device that cannot be easily attached has a reduced number of attachments, and the current measurement device is a device for which power is to be calculated.
- the power can be calculated by arbitrarily attaching to the power.
- the current measurement device transmits voltage information based on the measured voltage from the voltage measurement device, the current measurement device can calculate power based on the measured voltage and the measured current.
- the voltage information needs to be transmitted from the voltage measuring device, it is not necessary to transmit a lot of measured voltage data. As a result, power can be accurately calculated with a simple configuration.
- the power measuring method according to the present invention has a configuration in which the voltage measuring device and the current measuring device are provided separately, the voltage measuring device and the current measuring device can be attached according to their convenience.
- the voltage measurement device transmits voltage information based on the measured voltage to the current measurement device, the current measurement device can calculate electric power based on the measured voltage and the measured current.
- the voltage measuring device since the voltage measuring device only needs to transmit voltage information, it is not necessary to transmit data of many measured voltages. As a result, power can be accurately calculated with a simple configuration.
- FIG. 1 It is a block diagram which shows the structure of the electric power measurement system which concerns on one Embodiment of this invention. It is a block diagram which shows the case where the electric power measurement system shown in FIG. 1 is applied to the apparatus in a factory. It is a flowchart shown about the case where an electric power measurement system calculates the electric power supplied to a 2nd apparatus. It is a graph which shows the data of the measured voltage. It is a graph which shows the data of the measured electric current. It is a block diagram which shows the case where two or more current measuring devices are attached.
- FIG. 1 is a block diagram showing a configuration of a power measurement system 10 according to an embodiment of the present invention.
- a power measurement system 10 includes a voltage measurement device 11 that measures a voltage, and a current measurement device 12 that is provided separately from the voltage measurement device 11 and measures a current. Then, power is calculated using the voltage measured by the voltage measuring device 11 and the current measured by the current measuring device 12. In addition, the electric power said here points out instantaneous electric power.
- the voltage measurement device 11 includes a control unit 11c that controls the entire voltage measurement device 11, a measurement unit 11b that measures a voltage, a storage unit 11a that stores a voltage measured by the measurement unit 11b, a current measurement device 12, and a time A signal generation unit 11d that transmits a signal for matching the current to the current measurement device 12, and an I / F (interface) unit 11e that serves as an interface for connecting to an external device.
- the current measuring device 12 includes a control unit 12c that controls the entire current measuring device 12, a measuring unit 12b that measures current, a storage unit 12a that stores current measured by the measuring unit 12b, and signal reception that receives signals.
- Unit 12d and an I / F unit 12e serving as an interface for connecting to an external device.
- FIG. 2 is a block diagram showing a case where the power measurement system 10 shown in FIG. 1 is applied to equipment in the factory 16.
- a distribution board 17 and first to third devices 15 a to 15 c to which power is supplied via the distribution board 17 are provided in the factory 16.
- the distribution board 17 is provided with a plurality of breakers, and the plurality of breakers includes a main breaker 13 and first to third breakers 14a to 14c.
- the main breaker 13 cuts off the circuit when a certain current or more flows in the factory 16.
- the first breaker 14a is connected to the first device 15a, and cuts off the circuit when a current of a certain level or more flows toward the first device 15a.
- the second breaker 14b is connected to the second device 15b and shuts off the circuit when a certain current or more flows toward the second device 15.
- the third breaker 14c is connected to the third device 15c, and shuts off the circuit when a current of a certain level or more flows toward the third device 15c.
- the voltage measuring device 11 is attached to the main breaker 13 and measures the voltage supplied into the factory 16.
- the voltage supplied via the distribution board 17 is constant in the main breaker 13 and the first to third breakers 14a to 14c. That is, the voltage supplied from one distribution board 17 is constant.
- the current measuring device 12 is attached between the second breaker 14b and the second device 15b, and measures the current supplied to the second device 15b.
- FIG. 3 is a flowchart illustrating a case where the power measurement system 10 calculates the power supplied to the second device 15b. This will be described with reference to FIGS.
- the voltage measuring device 11 measures a voltage, for example, every 1 millisecond (ms) as a predetermined time interval (step S11 in FIG. 3 and the following steps are omitted).
- the voltage is measured continuously for 1 second, for example.
- the measuring unit 11b operates as the voltage measuring unit 18a.
- voltage information is created based on the measured voltage data.
- an approximate expression for obtaining the voltage is calculated as the voltage information (S12).
- FIG. 4 is a graph showing measured voltage data.
- the horizontal axis indicates time, and the vertical axis indicates voltage.
- an expression of a graph indicated by a dotted line is calculated from the voltage data shown in FIG. That is, the voltage data is converted into an approximate expression.
- the voltage measurement device 11 transmits the calculated approximate expression to the current measurement device 12 via the I / F unit 11e (S13).
- the controller 11c operates as the transmission means 18b.
- the voltage measuring device 11 transmits a signal for adjusting the time from the signal generating unit 11d to the current measuring device 12 (S14). For example, it is the time when voltage measurement is started, and the time t 0 in FIG. 4 is transmitted.
- the signal generator 11d operates as the signal transmission means 18c.
- the current measuring device 12 receives the approximate expression transmitted from the voltage measuring device 11 via the I / F unit 12e (S15).
- the control unit 12c operates as the receiving unit 19b.
- the current measuring device 12 receives a signal for adjusting the time from the voltage measuring device 11 in the signal receiving unit 12d (S16).
- the signal receiving unit 12d operates as the signal receiving unit 19e.
- the current measuring device 12 matches the time in the current measuring device 12 with the time in the voltage measuring device 11 based on the received signal (S17). This is because the voltage measuring device 11 and the current measuring device 12 are provided separately, and there may be a difference between the time of the voltage measuring device 11 that calculated the approximate expression and the time of the current measuring device 12. The deviation is adjusted. In addition, when adjusting time, the conventional method is utilized suitably.
- FIG. 5 is a graph showing measured current data.
- the horizontal axis represents time, and the vertical axis represents current.
- the measuring unit 12b operates as the current measuring unit 19a.
- the current measuring device 12 applies the time when the current was measured to the approximate expression, and obtains the voltage at the time when the current measuring device 12 measured the current from the approximate expression (S19).
- the control unit 12c operates as the voltage calculation unit 19d.
- the control unit 12c operates as the power calculation unit 19c.
- the voltage measurement device 11 and the current measurement device 12 can be attached according to their convenience. Moreover, since the voltage measuring device 11 transmits voltage information based on the measured voltage to the current measuring device 12, the current measuring device 12 calculates power based on the measured voltage and the measured current. Can do. Moreover, since the voltage measuring device 11 only needs to transmit voltage information, it is not necessary to transmit data of many measured voltages. As a result, power can be accurately calculated with a simple configuration.
- a voltage measuring device 11 transmits voltage information based on the measured voltage to the current measuring device 12, the current measuring device 12 calculates power based on the measured voltage and the measured current. Can be made. Moreover, since the voltage measuring device 11 only needs to transmit voltage information, it is not necessary to transmit data of many measured voltages. As a result, power can be accurately calculated with a simple configuration.
- the current measuring device 12 since the current measuring device 12 receives voltage information based on the measured voltage from the voltage measuring device 11, the current measuring device 12 calculates power based on the measured voltage and the measured current. It can be performed. Moreover, since only the voltage information needs to be transmitted from the voltage measuring device 11, it is not necessary to transmit a lot of measured voltage data. As a result, power can be accurately calculated with a simple configuration.
- FIG. 6 is a block diagram showing a case where a plurality of current measuring devices 22 and 23 are attached in the factory 16 of the embodiment shown in FIG.
- the current measuring device 22 is attached between the second breaker 14b and the second device 15b, and the current measuring device 23 includes the third breaker 14c and the third device 15c. It is attached between. Since the voltage is constant as described above, only one voltage measuring device 21 needs to be attached. In this case, the voltage measuring device 21 calculates an approximate expression based on the measured voltage, and transmits the calculated approximate expression toward the current measuring devices 22 and 23.
- each of the current measuring devices 22 and 23 based on the received approximate expression, the voltage at the time when the current is measured is calculated, and the calculated voltage is multiplied by the measured current of each device, whereby the power of each device is calculated. Is calculated.
- the power measurement system 20 calculates the power by reducing the number of attachments in the voltage measurement device 21 that cannot be easily attached and arbitrarily attaching the current measurement devices 22 and 23 to the device for which the power is desired to be calculated. can do. Further, even when a plurality of current measuring devices 22 and 23 are attached, it is only necessary to attach one in the voltage measuring device 21.
- the present invention is not limited to this, and can be applied to, for example, household electrical equipment.
- the electric power measurement system 10 demonstrated the example of a structure provided with the voltage measurement apparatus 11 and the electric current measurement apparatus 12, it is not restricted to this, An electric power measurement system is voltage measurement.
- the structure provided with an apparatus, an electric current measurement apparatus, and an electric power measurement apparatus may be sufficient.
- the power measuring device is, for example, a computer, and may display the power on a display or the like when notified of the power calculated from the current measuring device.
- the voltage measuring device 11 calculates an approximate expression based on the measured voltage as voltage information, and transmits the calculated approximate expression to the current measuring device 12.
- the present invention is not limited to this, and the voltage measuring device 11 may transmit a pulse signal to the current measuring device 12 at a timing when the measured voltage becomes zero. That is, the voltage information may be information indicating that the measured voltage is zero. Then, the current measuring device 12 may receive a pulse signal and calculate an approximate expression for obtaining a voltage based on the received pulse signal and a predetermined amplitude.
- the voltage information may be voltage data at a predetermined timing among measured voltage data, or may be information other than an approximate expression and based on the measured voltage.
- the voltage measuring device 11 is attached to the main breaker 13 .
- the present invention is not limited to this.
- the voltage measuring device 11 may be attached to the third breaker 14c. You may attach to the other breaker etc. which are provided in.
- the voltage measuring device 11 has been described with respect to the example including the signal generating unit 11d that transmits a signal for adjusting the time.
- the present invention is not limited to this. It may be provided as an external device.
- This invention is effectively used when power calculation is required.
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Claims (7)
- 電圧を計測する電圧計測装置と、電流を計測する電流計測装置とを備える電力計測システムであって、
前記電圧計測装置は、
所定の時間間隔で、電圧を計測する電圧計測手段と、
前記電圧計測手段により計測した電圧に基づく電圧情報を、前記電流計測装置に向けて送信する送信手段とを含み、
前記電流計測装置は、
前記電圧計測装置と別に設けられており、
所定の時間間隔で、電流を計測する電流計測手段と、
前記電圧計測装置から前記電圧情報を受信する受信手段と、
前記受信手段により受信した前記電圧情報と前記電流計測手段により計測した電流とに基づいて、電力を算出する電力算出手段とを含む、電力計測システム。 - 前記電圧情報は、電圧を求める近似式であって、
前記受信手段は、前記電圧計測装置から前記近似式を受信し、
前記電力算出手段は、前記受信手段により受信した前記近似式から、電圧を算出する電圧算出手段を含み、前記電圧算出手段により算出した電圧と、前記電流計測手段により計測した電流とに基づいて、電力を算出する、請求項1に記載の電力計測システム。 - 前記近似式は、算出する電圧をV、公称電圧をVa、角速度をωtとすると、V=Vacosωtである、請求項2に記載の電力計測システム。
- 前記電圧計測装置は、前記電流計測装置と時刻を合わせるための信号を送信する信号送信手段を含み、
前記電流計測装置は、前記電圧計測装置から前記時刻を合わせるための信号を受信する信号受信手段を含み、
前記電圧算出手段は、前記信号受信手段により受信した前記信号に基づいて、前記電流計測装置が電流を計測した時間における電圧を前記近似式から求める、請求項2に記載の電力計測システム。 - 電圧を計測する電圧計測装置であって、
所定の時間間隔で、電圧を計測する電圧計測手段と、
前記電圧計測手段により計測した電圧に基づく電圧情報を、前記電圧計測装置とは別に設けられ、電流を計測して電力を算出する電流計測装置に向けて送信する送信手段とを備える、電圧計測装置。 - 電流を計測する電流計測装置であって、
電圧を計測する電圧計測装置と別に設けられており、
所定の時間間隔で、電流を計測する電流計測手段と、
前記電圧計測装置から、計測した電圧に基づく電圧情報を受信する受信手段と、
前記受信手段により受信した前記電圧情報と前記電流計測手段により計測した電流とに基づいて、電力を算出する電力算出手段とを備える、電流計測装置。 - 電圧計測装置において、所定の時間間隔で、電圧を計測する電圧計測ステップと、
電圧計測装置において、前記電圧計測ステップにより計測した電圧に基づく電圧情報を、電圧計測装置と別に設けられている電流を計測する電流計測装置に向けて送信する送信ステップと、
電流計測装置において、所定の時間間隔で、電流を計測する電流計測ステップと、
電流計測装置において、電圧計測装置から電圧情報を受信する受信ステップと、
電流計測装置において、前記受信ステップにより電圧計測装置から受信した電圧情報と前記電流計測ステップにより計測した電流とに基づいて、電力を算出する電力算出ステップとを含む、電力計測方法。
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CN109374991A (zh) * | 2018-07-31 | 2019-02-22 | 国网江苏省电力有限公司徐州供电分公司 | 一种基于不同位置电场变化测量的高压输电线路电压等级确认装置及其确认方法 |
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JP2006337193A (ja) * | 2005-06-02 | 2006-12-14 | Toshiba Corp | 電力計測装置 |
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JPH10201140A (ja) * | 1997-01-09 | 1998-07-31 | Hitachi Ltd | 電気的特性値の監視方法およびその監視装置 |
JP2009008580A (ja) * | 2007-06-29 | 2009-01-15 | Chugoku Electric Power Co Inc:The | ハンディ電力計および3相電力測定方法 |
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JP5488072B2 (ja) | 2014-05-14 |
KR20120092177A (ko) | 2012-08-20 |
KR101351129B1 (ko) | 2014-01-14 |
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