JP2016170120A - Recorder and measurement system having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a measurement system capable of making measurements in further precise synchronization of measurement time with a simple configuration.SOLUTION: A measurement system has a plurality of recorders 1, each having a frequency timepiece that keeps time on the basis of a power supply frequency. The frequency timepieces of the plurality of recorders 1, 1, ... are configured to keep time on the basis of the power supply frequency extracted from power supply voltage of the same power supply.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a recorder that measures at least one of the voltage and current of a power distribution path connected to a watt-hour meter, and a measurement system that uses the recorder.

  Patent Document 1 discloses a voltage / current recorder that is temporarily installed in a consumer's watt-hour meter, etc., and that can measure, display, and record the voltage fluctuation state and the load current state and check the distribution line state. ing.

  In recent years, with the spread of renewable energy, such as solar power generation, to homes, inquiries regarding output suppression, voltage, etc. from power consumers are increasing. In some cases, the measurement of the voltage fluctuation state and the load current state is performed over a long period of time (for example, several days) using such a recorder.

  In the above measurement, for example, in the case of household use, a plurality of measurement points such as a watt hour meter, a lead-in branch point, and a pole transformer provided in each household of the power consumer are set, and a recording meter is set at each measurement point. May be installed and measured. In that case, for example, an operator such as an operator wirelessly receives measurement data at each measurement location using a terminal device such as a tablet after measurement, and displays display data created based on the measurement data as a power consumer. In some cases, explanations are given.

  As mentioned above, when acquiring measurement data from recorders installed at multiple measurement locations and performing confirmation, analysis, etc., if there is a time lag between multiple recorders, accurate confirmation, analysis, etc. Therefore, it is strongly desired that the time of the measurement data is exactly the same.

  A general recorder is provided with a clock device based on an RTC (Real-Time Clock) circuit or the like, but it is difficult to accurately match the time due to manufacturing variations of components and circuits. In some cases, a time lag of several seconds may occur between several recorders in several days. Therefore, it is conceivable that each recorder is equipped with a clock having a time correction function using wireless communication such as a GPS (Global Positioning System) clock, but the time information is high in an environment where the cost is high and there are obstacles. Cannot be received with high accuracy.

  On the other hand, for example, in Patent Document 2, when a plurality of waveform recording devices are installed, the sampling timing between the waveform recording devices can be matched on the time axis, and sampling data can be recorded as one waveform recording device group. And a waveform recording method are disclosed. In this device, the main machine and the sub machine are connected by a dedicated cable or a communication network, and the sampling time on the time axis is made to coincide using a common sampling signal.

  Patent Document 3 discloses a clock device used for an electronic watt hour meter or the like, which counts pulses corresponding to a power frequency and keeps time as a power synchronized clock. In this case, the time of the backup clock is adjusted to the time of the frequency clock at regular intervals, and when the pulse is shorter than the reference power cycle (for example, when noise is mixed in the power supply), by switching to the backup clock, It prevents the clock from moving forward.

JP-A-7-92200 Japanese Patent No. 4649397 Japanese Patent Laid-Open No. 8-21884

  However, in the case of a method of transmitting a sampling signal via a dedicated cable as in Patent Document 2, for example, between measurement points such as a home watt-hour meter, a service branch point, and a secondary side of a pole transformer Need to be connected with a dedicated cable, but it is not realistic to perform such work for each measurement (every time the measurement location is different). Further, even if an existing wireless communication line is used as a communication network and a sampling signal is transmitted / received via the wireless communication line, the wireless communication line may have a steady or sudden noise in a long-term measurement. In some cases, the measurement times of a plurality of recorders may be shifted during the measurement period. In other words, it may be difficult to keep accurate time coincidence.

  When a technique such as that disclosed in Patent Document 3 is applied to one recorder among a measurement system having a plurality of recorders, and a clock based on an RTC circuit or the like is built in another recorder, It is difficult to make the measurement times coincide between the two recorders. Even when the technique disclosed in Patent Document 3 is applied to all of the plurality of recorders, the recorder alone determines whether or not the power cycle falls within a specified range for each predetermined period. Thus, the time can be corrected, that is, the advance of the clock can be prevented every predetermined period, but there are cases where the time cannot be accurately matched among a plurality of recorders. Specifically, it is not possible to correct a time lag between a plurality of recorders during a predetermined period in which the power cycle is determined. In addition, even in a period exceeding the predetermined period, when the power supply cycle is deviated between the plurality of recorders within the specified range, the time between the plurality of recorders is shifted as the measurement period elapses. May occur and the time cannot be accurately matched.

  The present invention has been made in order to solve the above-mentioned problems, and its main purpose is to make the measurement time coincide with each other more accurately when measuring with a plurality of recorders attached to the low piezoelectric path. It is an object of the present invention to provide a recorder and a measurement system that can perform the above-mentioned.

  The measurement system according to the present invention is a measurement system including a plurality of recorders attached to different places in the low piezoelectric path, and includes a frequency clock in which each recorder counts time based on a power supply frequency, Each of the total frequency clocks was configured to keep time based on the power supply frequency extracted from the power supply voltage of the same power supply.

  In other words, according to the first aspect of the present invention, there is provided a measurement system including a plurality of recorders attached to different places in the low piezoelectric path, and each recorder records a time based on a power supply frequency. A frequency clock, a measurement unit that measures at least one of the voltage and current of the mounting location, a storage unit that stores data, and measurement data measured by the measurement unit based on the time of the frequency clock or a predetermined number of times And a control unit that stores the data in the storage unit over a predetermined period, and the frequency clocks of the plurality of recorders are configured to keep time based on the power supply frequency extracted from the power supply voltage of the same power supply.

  According to this aspect, since each recorder is configured to perform measurement over a predetermined number of times or a predetermined period based on the power supply frequency of the same power supply, noise is mixed into the power supply due to load fluctuation or the like during measurement. Even if the frequency clock deviates from the standard time (for example, Japan Standard Time) due to slight fluctuations in the power supply frequency, the time of the frequency clocks of the multiple recorders will be uniformly shifted. Measurement can be continued without any time lag between the two. Thereby, it becomes possible to analyze the measurement data more accurately. In addition, it is not necessary to transfer a special signal such as a sampling signal between the recorders when the time is matched between the recorders.

  The measurement system according to the aspect described above includes a terminal device configured to be capable of bidirectional wireless communication with each of the recorders and having an internal clock, and each of the recorders transmits and receives data to and from the terminal device. A wireless communication unit that transmits the current time of the internal clock wirelessly to each recorder, and the control unit of each recorder receives from the terminal device via the wireless communication unit The current time of the internal clock is reflected in the time of the frequency clock, and the measurement data measured by the measurement unit based on the time of the frequency clock after the reflection is stored in the storage unit. May be.

  According to this aspect, since each recorder reflects the current time of the internal clock received from the terminal device in the time of the frequency clock and starts measurement based on the time of the frequency clock, each recorder at the measurement start time The time between can be matched more accurately. Here, even when the time of the terminal device is deviated from the standard time, the measurement start times between the recorders coincide. Therefore, regardless of the relationship between the time of the terminal device and the standard time, the measurement can be started in a state where there is no time lag between the measurement data of each recorder. In addition, when the time of a terminal device corresponds with standard time, the some recorder can perform the measurement based on standard time, and it is more preferable.

  In the measurement system of the above aspect, the terminal device is configured to wirelessly transmit a measurement start time to each of the recorders in addition to the current time of the internal clock, and the control unit of each of the recorders includes: After reflecting the current time of the internal clock on the time of the frequency clock, the measurement data measured by the measurement unit based on the time of the frequency clock from the measurement start time is stored in the storage unit May be.

  According to this aspect, since the recorder is configured to start measurement from the measurement start time, the current time of the internal clock can be set to each recorder from the terminal device prior to the start of measurement. As a result, the management of the measurement time is facilitated, and for example, the operator can send the time in the order (time adjustment) while individually confirming the reception status of each recorder at the terminal device. Become. That is, the convenience for the operator is improved, and the measurement can be started after the time setting of the plurality of recorders is completed.

  In the measurement system of the above aspect, the recorder further includes a real-time clock circuit that generates time data, and the controller of the recorder calculates the time of the frequency clock at a predetermined time. The measurement by the measurement unit is switched from the measurement based on the time of the frequency clock to the measurement based on the time of the real-time clock circuit when the power supply frequency is reflected in the time and the power supply frequency is out of a predetermined frequency range. It may be configured.

  According to this aspect, for example, even if there is a deviation in the time of the real-time clock circuit between the respective recorders due to manufacturing variations of parts, circuits, etc., the time of the real-time clock circuit is changed every predetermined period. The time can be corrected at the same time. Thereby, even if a power failure occurs, measurement can be continued after power recovery. As a result, the recorder according to this aspect can continue the measurement with as little time error as possible even in an emergency or the like while keeping the time coincidence between the plurality of recorders during the normal operation.

  In the above aspect, even when power supply noise is mixed, the frequency clocks of a plurality of recorders are uniformly shifted according to the noise, so that the time between recorders can be changed without switching to the real-time clock circuit. Measurement can be continued without any deviation. On the other hand, the controller of the recorder can be switched to the real-time clock circuit, so that accurate time coincidence between multiple recorders during normal operation can be achieved, but if power supply noise is mixed, it is standard. There is an advantage that the measurement can be continued by eliminating the deviation from the time as much as possible.

  In the measurement system of the above aspect, the terminal device collects the measurement data measured by the display unit capable of displaying data and the measurement unit of each recorder by wireless communication, and for the display unit, A terminal control unit that displays waveform data that is at least one of the measurement data of each recorder and the processing data calculated based on the measurement data on the same time axis. Good.

  According to this aspect, since the waveform data based on the measurement data received from each recorder by the terminal device can be displayed on the same time axis, the voltage fluctuation state and load current state fluctuation at each measurement point can be displayed. The comparison of the state (hereinafter, also referred to as a voltage fluctuation state) becomes easy. In addition, for example, when an operator explains the fluctuation state etc. to an electric power consumer, the waveform data can be shown and explained, and the explanation is easy and easy to understand for the electric power consumer. There are advantages that can be made.

  In the measurement system of the above aspect, the display unit of the terminal device includes a first display unit configured to display the waveform data on the same time axis, and waveform data to be displayed on the first display unit. A second display unit configured to be able to display the different waveform data on the same time axis, and the first display unit and the second display unit are arranged vertically so that the time in the horizontal direction of the screen is aligned. You may be comprised so that it may arrange in the direction.

  According to this aspect, for example, when the voltage fluctuation state is displayed on the first display unit and the load current state is displayed on the second display unit, the time in the horizontal direction of the screen is aligned. The data can be confirmed while comparing the data displayed on the second display unit on the same time axis. As a result, for example, the waveforms of items that are correlated, such as voltage fluctuations and current fluctuations, can be displayed with separate display and aligned time axes. There is an advantage that the explanation using the relationship becomes easy and the explanation can be easily understood for the electric power consumer.

  In a second aspect of the present invention, a recorder attached to a low piezoelectric path, a frequency clock that clocks time based on a power supply frequency, a measuring unit that measures at least one of voltage and current at the mounting location, and data And a control unit for storing the measurement data measured by the measurement unit in the storage unit for a predetermined number of times or a predetermined period based on the time of the frequency clock, the frequency clock of the recorder is The time is recorded based on the power supply frequency extracted from the power supply voltage of the same power supply as other recorders having the same configuration attached to different places in the low piezoelectric path.

  According to this aspect, the recorder is configured to perform the measurement over a predetermined number of times or a predetermined period based on the power supply frequency of the same power source as the other recorders. Even when the power supply frequency fluctuates slightly and the frequency clock deviates from the standard time (for example, Japan Standard Time), measurement continues without any time lag with other recorders. can do. Thereby, for example, when collecting measurement data from an external device after measurement, it is possible to provide data in which time coincides with other recorders.

  The recorder according to the aspect includes a wireless communication unit that transmits and receives data to and from a terminal device that collects measurement data, and the control unit is included in the terminal device from the terminal device via the wireless communication unit. When the current time of the internal clock is received, the current time is reflected in the time of the frequency clock, and after the reflection, the measurement data measured by the measurement unit based on the time of the frequency clock is stored in the storage unit You may be comprised so that.

  According to this aspect, since the recorder starts the measurement based on the time of the frequency clock after reflecting the current time of the internal clock received from the terminal device in the time of the frequency clock, the time at the measurement start time is set to the terminal device. The measurement can be started in a state in which the time of the internal clock is matched. Thereby, the recorder according to the present disclosure can provide measurement data that can be easily confirmed and analyzed by the terminal device. Furthermore, for example, when performing measurement using a plurality of recorders, the time of the plurality of recorders at the measurement start time can be made coincident with the time of the internal clock of the terminal device. It is possible to more reliably prevent the measurement time from shifting.

  According to the present invention, when measurement is performed by installing recorders at a plurality of different points on the power distribution path, the measurement time can be more accurately matched with a simple configuration.

1 is an overall configuration diagram including a measurement system according to an embodiment. It is a block diagram which shows the connection state of a recorder. It is a block diagram which shows the connection state of a terminal device. It is a flowchart which shows the flow of the clock setting of a recorder. It is a flowchart which shows the flow of the process which concerns on the measurement of a measurement system. It is the figure which showed an example of the display screen of a measurement result.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiments is merely exemplary in nature and is not intended to limit the invention, its scope of application, or its application.

  As shown in FIG. 1, the plurality of recorders 1, 1,... According to this aspect are attached to different locations in the low piezoelectric path 90. In the example of FIG. 1, the recorder 1 is connected to the connection terminal on the secondary side (low voltage distribution line 93 side) of the pole transformer 92, the connection terminal of the lead-in branch point 94, and the connection terminal at the instrument attachment point 95. Yes. More specifically, the recorder 1 has a voltage measurement cable proximal end connected to a voltage terminal 26 described later, and a current measurement cable proximal end 25 (25a, 25b, 25c) described later. A detection unit (not shown) provided at the tip of each cable is connected so that the voltage and current of the low piezoelectric path 90 can be measured at each mounting location. In the present disclosure, the low piezoelectric path 90 is an instrument attachment point from the terminal on the low-voltage wire side of the pole transformer 92 connected between the high-voltage distribution line 91 and the low-voltage distribution line 93 via the lead-in branch point 94. The concept includes a low-voltage distribution route 97 and an indoor wiring route 96 up to 95. The indoor wiring path 96 is a wiring path on the indoor side of the meter attachment point 95 to which the watt hour meter 99 is attached, and between the power conditioner to which the solar power generation device 83 is connected and the distribution board 85. And a wiring path from the distribution board 85 to each load. In the following embodiments, the distribution path to be measured is described as being a single-phase / three-phase three-wire system.

(Configuration of recorder)
As shown in FIG. 2, the recorder 1 is provided with a current terminal 25 and a voltage terminal 26 provided on the substrate 10, and the current signals I <b> 1 to I <b> 3 and voltage of the low piezoelectric path 90 from these terminals 25 and 26. P1 to P3 are input. The current signals I1 to I3 are input to the measurement unit 12 via the current input circuit 11 having a burden resistance configured to be switchable according to the current measurement range of the detection unit. The voltages P1 to P3 are input directly or divided into the measurement unit.

  The measurement unit 12 receives the current signals I1 to I3 and the voltages P1 to P3, performs A / D (Analog / Digital) conversion, and outputs the measurement result to the CPU 13 as a digital signal. In addition, the sampling period by the measurement part 12 can be set arbitrarily. Further, the measurement unit 12 may be configured to measure any one of the current signals I1 to I3 and the voltages P1 to P3.

  The CPU 13 performs various controls such as changing various settings related to the measurement operation and acquiring, recording, and transmitting measurement data. Further, based on settings from the operation unit 32 or an external device or predetermined settings, the current measurement values based on the voltages P1 to P3 and the current signals I1 to I3 and various setting information are displayed on the display unit 31. Control the display. Further, the CPU 13 digitally converts the voltage (for example, P1) input from any of the voltage terminals 26 by the A / D conversion circuit 17 for frequency counting, and records the time based on the voltage (power supply frequency). It is configured to The frequency timepiece according to the present disclosure refers to a configuration in which time is recorded based on the power supply frequency extracted from the voltage received from the low piezoelectric path.

  The wireless communication unit 16 is configured to be capable of bidirectional data communication with a wireless communication unit 42 of a terminal device (for example, a tablet terminal) 40 described later. For example, the wireless communication unit 16 receives various setting information from the terminal device 40 and transmits measurement data and the like to the terminal device 40. Specifically, a beacon signal indicating the presence of the own device is transmitted, or measurement data received from the CPU 13 in response to a measurement data request received from the terminal device 40 is transmitted to the terminal device 40.

  The power of each circuit provided on the substrate 10 is supplied from the power supply unit 15, and the power supply unit 15 receives the voltages P1 and P2 and generates a DC power supply. The recorder 1 includes a real-time clock circuit (hereinafter also referred to as RTC circuit) 18 connected to the CPU 13 as an internal clock, and operates by receiving power from the built-in battery 19.

(Configuration of terminal device)
As shown in FIG. 3, a terminal device 40 used by an operator or the like includes a wireless communication unit 42 configured to be capable of bidirectional data communication with the wireless communication unit 16 included in each recorder 1, and a wireless communication unit 42. CPU 43 for controlling the communication. Data transmitted to and received from the wireless communication unit 16 of each recorder 1 is as described above.

  The CPU 43 performs various controls. Specifically, various settings related to the measurement operation are changed for each recorder 1, measurement data is acquired from each recorder 1, the acquired measurement data is recorded in the memory 44, and recorded in the memory 44 Various controls are performed such as processing the measured data and displaying it on the display unit 41a of the touch panel 41. Data (information) transmitted from the CPU 43 to the recorder includes, for example, various setting information such as time information, measurement cycle information, and current measurement range setting information from the terminal device 40. Further, a data request signal or the like is transmitted to each recorder 1 to request each recorder 1 to transmit measurement data.

(Recorder clock setting and measurement (1))
In the following, an example of a clock setting flow and voltage / current measurement flow of the recorder 1 will be described in detail with reference to FIG. In this “clock setting and measurement (1) of recorder”, it is assumed that the times of all the RTC circuits 18 of the plurality of recorders 1, 1,.

  First, the operator installs a plurality of recorders 1, 1,... At each measurement location, and attaches the voltage measurement cable and the current measurement cable detection unit to the low piezoelectric path 90.

  In each recorder 1, when the detection unit is attached to the low piezoelectric path 90, the CPU 13 performs frequency determination (50 Hz / 60 Hz) based on the output result of the A / D conversion circuit 17 (S11). Specifically, it is confirmed whether the power supply frequency is within a predetermined range with respect to 50 Hz or 60 Hz, and the power supply frequency (50 Hz or 60 Hz) of the connected low piezoelectric path is determined.

  When the frequency determination is confirmed in S11, the time of the RTC circuit 18 is reflected in the frequency clock (S12), and then the CPU 13 stores the time based on the frequency clock and the measurement data at the time in the memory 14 (S13). It is determined whether or not the number of acquisitions (the number of stored data) has reached a predetermined number (a predetermined number of data) (S14).

  If the number of data acquisition times is less than the predetermined number (No in S14), it is confirmed whether or not the power frequency of the low piezoelectric path at the measurement location is within the predetermined range (S15). It is confirmed whether time has passed (S16). Then, until the data acquisition count reaches the predetermined count (Yes in S14) or until the clock update time elapses (No in S16), the flow repeatedly performs the processing from S13 to S16. That is, the CPU 13 accumulates the measurement data in the storage unit until a predetermined number of times is reached every predetermined time based on the time of the frequency clock.

  On the other hand, when the clock update time has elapsed in S16 (Yes in S16), the time of the frequency clock is reflected in the time of the RTC circuit 18 (S17), and the flow returns to S13. As a result, the time of the RTC circuit 18 can be updated to the time of the frequency clock at every clock update time.

  Further, when the frequency determination is unconfirmed in S11, or when the power supply frequency of the low piezoelectric path 90 related to the measurement location is out of the predetermined range (in the case of abnormality) in S15, the CPU 13 determines the predetermined frequency of the RTC circuit 18. For each time, the time of the RTC circuit 18 and the measurement data at the time are stored in the memory 14.

  A plurality of recorders 1, 1,... Perform the above flow at each measurement location. In the normal flow (when the measurement is completed by repeatedly performing S13 to S16), for example, after a sufficient period of time has elapsed from the start of measurement (after the measurement is completed), the terminal device 40 or the like is used. When the measurement data is requested to the recorder 1, the data stored for a predetermined number of times can be acquired from each recorder 1 based on the time of the frequency clock.

  Here, since the frequency clock of each recorder 1 is configured so as to keep the time based on the power supply frequency extracted from the voltage of the same power source (on the same low piezoelectric path), Even when noise is mixed in the power supply during measurement or the power supply frequency fluctuates slightly and the frequency clock deviates from the standard time (for example, Japan Standard Time), the frequency clocks of multiple recorders 1 Since the time is uniformly shifted, the measurement can be continued in a state where there is no time difference between the recorders 1. As a result, it is possible to measure the voltage, current, etc. more accurately by matching the measurement times, and to more accurately analyze and display the measurement data.

  Further, when the power supply frequency of the low piezoelectric path 90 is out of a predetermined range, the CPU 13 records the measurement data based on the time of the RTC circuit 18 corrected by the frequency clock, so that it can be used during normal operation. Measurement can be continued with as little time error as possible even when there is an abnormality while keeping time coincidence among a plurality of recorders.

  In the present invention, even when power supply noise is mixed, the frequency clocks of the plurality of recorders 1, 1,... Are evenly shifted in accordance with the noise, so there is no need for the branching of S15 and the processing of S18. It doesn't matter. However, by providing the above branching of S15 and the processing of S18, accurate time coincidence among a plurality of recorders during normal operation is realized, and if power supply noise is mixed, a deviation from the standard time is achieved. This is useful when there is a need to eliminate measurement as much as possible and continue measurement.

(Recorder clock setting and measurement (2))
Next, another example of the clock setting flow and voltage / current measurement flow of the recorder 1 will be described in detail with reference to FIG. Note that S11, S12, and S15 to S18 are the same as or similar to the flow in FIG. 4 and may not be described in detail.

  First, the operator installs a plurality of recorders 1, 1,... At each measurement location, and attaches the voltage measurement cable and the current measurement cable detection unit to the low piezoelectric path 90. Then, in each recorder, the processing of S11 and S12 in FIG. 4 is performed.

  Next, the operator operates the operation unit 41b of the terminal device 40 to sequentially transmit the time of the internal clock of the terminal device 40 and the measurement start time to the plurality of recorders 1, 1,... (S21). At this time, each recorder 1 is transmitting a beacon (S30), and the worker confirms the recordable recorder 1 among the recorders 1 installed on the terminal device 40 (S20), The time of the internal clock is transmitted from the communicable recorder 1 to the desired recorder 1.

  Each recorder 1 that has received the time of the terminal device 40 reflects the received terminal time on the time of the frequency clock and the time of the RTC circuit 18 (S31), and causes the measurement unit 12 to measure voltage, current, and the like (S32). ). In S <b> 32, the CPU 13 causes the measurement unit 12 to measure voltage, current, etc., but does not store the measurement result in the memory 14. Then, the CPU 13 of each recorder 1 repeats the measurement of S32 until the measurement start time (reserved time in FIG. 5) (No in S33). At this time, the CPU 13 may display the measurement result in S32 on the display unit 31.

  Thereafter, when the measurement start time is reached (Yes in S33), each recorder 1 continuously accumulates measurement data in the storage unit until it reaches a predetermined number of times every predetermined time (S34). When the recording of the measurement data a predetermined number of times is completed (Yes in S35), the recorder 1 enters a standby state in which the measurement data can be transmitted (S36). At this time, the determinations of S15 and S16 in FIG. 4 are also performed in parallel, and the flow proceeds to S17 and S18 as necessary.

  Next, the operator receives a beacon from the recorder 1 using the terminal device 40 or the like after a sufficient period of time has elapsed since the start of measurement (after completion of the measurement), and confirms the recorder 1 that can communicate. At the same time, it is confirmed whether or not the measurement is completed (S22). After that, when the operator operates the operation unit 41b of the terminal device 40 to request measurement data from each recorder 1 (S23), the recorder 1 sends the terminal device 40 to the terminal device 40 based on the time of the frequency clock. The data stored for a predetermined number of times is transmitted (S37). The measurement data collected in the terminal device 40 is stored in the memory 44 (S24) and displayed on the display unit 41a according to the operation of the operator (S25).

  FIG. 6 is a diagram showing a display example of measurement data on the touch panel 41. The upper part of FIG. 6A shows an example in which the voltage waveforms of a plurality of recorders 1, 1,... Are superimposed and displayed, the solid line is the lead-in branch point 94, and the broken line is the secondary of the pole transformer 92. The two-dot chain line indicates the voltage waveform at the instrument attachment point 95. The lower part of FIG. 6A is a waveform displayed together with the magnitude and direction of the tidal current at the instrument attachment point 95. FIG. 6B shows an example in which the power amounts of a plurality of recorders 1, 1,... At each time are displayed side by side as a bar graph. The amount, black are the forward power of the instrument attachment point 95, and the white are the reverse power of the instrument attachment point 95.

  As shown in FIG. 6A, the waveform data (voltage) based on the measurement data received from each recorder 1 is displayed in an overlapping manner on the same time axis, thereby making it easy to confirm the comparison of the voltage variation state. ing. Further, by displaying the voltage waveform and the reverse power flow waveform at the installation location of each recorder 1 in the vertical direction so that the time in the horizontal direction of the screen of the touch panel 41 is aligned, the voltage at each measurement location and the reverse power flow are displayed. The relationship can be easily grasped. In addition, as shown in FIG.6 (b), you may display by a bar graph and you may make it display several measurement data of the same recorder 1 in piles.

  As described above, according to this aspect, each recorder 1 starts the measurement based on the time of the frequency clock after reflecting the current time of the internal clock received from the terminal device 40 in the time of the frequency clock. The time between the recorders 1 at the start time can be more accurately matched. Further, since each recorder 1 is configured to start measurement from the measurement start time designated by the terminal device 40, the management of the measurement time becomes easy.

  In addition, by notifying the beacon from each recorder 1 at the application level, data collection and operation mode setting can be performed while recognizing the existence of the recorder 1 on the terminal device side. Furthermore, by using the beacon, it is not necessary to register information of each recorder 1 in advance in the terminal device, and data collection and operation mode setting can be made for an unspecified recorder 1.

  While the preferred embodiments of the present invention have been described above, various modifications are possible.

-Modification-
For example, in the present embodiment, the low-piezoelectric path 90 to be measured has been described as being a single-phase / three-phase three-wire type, but the present invention is not limited to this, and the recorder 1 and the measurement system according to the present invention are single. The present invention can also be applied to the phase 2-wire type low piezoelectric path 90.

  In addition, instead of the voltage waveform or power flow (current waveform) in FIG. 6A, waveforms such as power factor, phase, and power may be displayed. In FIG. 6B, a bar graph indicating the amount of power may be displayed in the upper stage, and waveforms such as voltage, power flow (current), power factor, phase, and power may be displayed in the lower stage.

  The recorder according to the present invention is very useful as a recorder for measuring the voltage fluctuation state of the low piezoelectric path and the like because it can measure with a simple configuration and more accurately by matching the measurement time.

1 Recorder 12 Measuring unit 13 CPU (Control unit)
14 Memory (storage unit)
16 wireless communication unit 18 real-time clock circuit 22a groove 22b plate-like closed part 33 belt 40 terminal device 41a display unit 43 CPU (terminal control unit)

Claims (8)

A measurement system comprising a plurality of recorders mounted at different locations in a low piezoelectric path,
Each recorder is
A frequency clock that ticks the time based on the power supply frequency;
A measuring unit for measuring at least one of voltage and current at the mounting location;
A storage unit for storing data;
A control unit that stores measurement data measured by the measurement unit in the storage unit over a predetermined number of times or a predetermined period based on the time of the frequency clock,
The frequency clock of the plurality of recorders is configured to clock each time based on the power supply frequency extracted from the power supply voltage of the same power supply. The measurement system according to claim 1,
Each terminal is configured to be capable of bidirectional wireless communication with each recorder, and includes a terminal device having an internal clock,
Each of the recorders further includes a wireless communication unit that transmits and receives data to and from the terminal device,
The terminal device wirelessly transmits the current time of the internal clock to each recorder,
The control unit of each recorder reflects the current time of the internal clock received from the terminal device via the wireless communication unit in the time of the frequency clock, and after the reflection, based on the time of the frequency clock A measurement system characterized in that measurement data measured by a measurement unit is stored in the storage unit. The measurement system according to claim 2, wherein
The terminal device is configured to wirelessly transmit a measurement start time to each recorder in addition to the current time of the internal clock,
The control unit of the recorder reflects the current time of the internal clock on the time of the frequency clock, and then stores the measurement data measured by the measurement unit based on the time of the frequency clock from the measurement start time A measurement system characterized by being stored in a unit. The measurement system according to any one of claims 1 to 3,
The recorder is
It further includes a real-time clock circuit that generates time data,
The controller of the recorder reflects the time of the frequency clock on the time of the real-time clock circuit every predetermined time, and the measurement by the measurement unit when the power supply frequency is out of the predetermined frequency range. Switching from measurement based on the time of the frequency clock to measurement based on the time of the real-time clock circuit. The measurement system according to claim 2 or 3,
The terminal device
A display unit capable of displaying data;
Collecting measurement data measured by the measurement unit of each recorder by wireless communication, and for the display unit, at least of the measurement data of each recorder and the processing data calculated based on the measurement data On the other hand, a measurement system comprising: a terminal control unit that displays certain waveform data superimposed on the same time axis. The measurement system according to claim 5, wherein
The display unit of the terminal device
A first display unit configured to be able to display the waveform data on the same time axis;
A second display unit configured to display the waveform data different from the waveform data to be displayed on the first display unit on the same time axis;
The measurement system, wherein the first display unit and the second display unit are arranged in the vertical direction so that the time in the horizontal direction of the screen is aligned. A recorder attached to the low piezoelectric path,
A frequency clock that ticks the time based on the power supply frequency;
A measuring unit for measuring at least one of voltage and current at the mounting location;
A storage unit for storing data;
A control unit that stores measurement data measured by the measurement unit in the storage unit over a predetermined number of times or a predetermined period based on the time of the frequency clock,
The frequency clock of the recorder is configured to keep time based on the power supply frequency extracted from the power supply voltage of the same power supply as other recorders having the same configuration attached to different places in the low piezoelectric path. Recorder characterized by being. The recorder according to claim 7,
A wireless communication unit that transmits and receives data to and from a terminal device that collects measurement data is provided.
When the control unit receives the current time of the internal clock of the terminal device from the terminal device via the wireless communication unit, the control unit reflects the current time on the time of the frequency clock, and after the reflection, the frequency A recorder that stores measurement data measured by the measurement unit based on the time of a clock in the storage unit.

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