JP2742849B2 - Power monitoring recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of recording a waveform of a load current, a leakage current and a line voltage in a distribution board for a short time and recording an effective value of the waveform for a long time. Suspension of power used via distribution board (that is, power outage)
The present invention relates to a power supply monitoring recorder that analyzes and determines the cause of the above and reports the result of the determination.

[0002]

2. Description of the Related Art In recent years, power has been used via a distribution board regardless of the demand for electric lights or electric power for business use.
As shown in FIG. 5, for example, a distribution board 1 used in a general home includes overload circuit breakers (current limiters, circuit breakers for wiring) 2,
3 and an earth leakage breaker 4 are provided.

If the power used exceeds the permissible range of the current limiter 2 and each wiring breaker 3, the relay of each of the current limiter 2 and each wiring breaker 3 is activated, or a short circuit occurs. Occurs, the relay of the earth leakage breaker 4 operates.

[0004] Therefore, even if an over-rating or leakage occurs, the supply of electric power is immediately stopped. For example, it is possible to prevent a fire or the like from occurring, and the safety is extremely high.

By the way, in order to stop the supply of the power used through the distribution board 1, that is, to know the cause of the power failure, it is necessary to constantly measure the AC current and AC voltage waveform of the power. A meter or a waveform recorder may be used.

[0006]

However, in the above-described measurement, for example, a short-time waveform recording by the distribution board 1 and a long-term effective value recording cannot be performed at the same time. It requires a device for recording and a device for long-term waveform recording.It also requires a number of devices depending on the items to be investigated, such as load current, leakage current, and line voltage. Must be placed as one external device.

Further, as shown in the waveform diagram of the AC voltage and the AC current in FIG. 6, at the time of the power failure, it is necessary to measure the waveforms of the AC voltage and the AC current (shown in FIGS. A and b) until the power failure. Although it is possible, it is difficult to determine from the measured waveform whether the cause of the power failure is due to overload, earth leakage, phase loss, etc. There is a problem that cannot be analyzed. 5A shows an AC voltage waveform, and FIG. 5B shows an AC current waveform.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to automatically determine the cause of power supply interruption (power failure) via a distribution board without requiring many measuring devices. It is an object of the present invention to provide a power supply monitoring recorder which can make a judgment and display, and which enables ordinary persons to easily know the cause of the power failure.

[0009]

In order to achieve the above object, a power supply monitoring recorder according to the present invention includes a plurality of current clamps for detecting a load current and a leakage current, and at least one voltage probe for detecting a line voltage. An input unit for inputting the detected current and voltage for each channel and digitally converting the input current and voltage signals, a waveform capturing unit for capturing waveform data digitally converted by the input unit for each channel, A waveform data recording unit for recording the obtained waveform data in a ring system; a calculating means (CPU) for calculating an effective value based on the fetched waveform data to obtain effective value data; The effective value data recording unit to be recorded is compared with at least one of the elements of the commercial power supply to be used and the reference value. A power supply monitoring unit that monitors the load current, the leakage current and the line voltage, calculates effective value data based on the detected current and voltage waveform data, and records at least the same effective value data when recording. A clock section (CPU) for measuring the time from the start of calculation and recording;
The time read by the clock section is read, and when the read time is a predetermined time, the counter section is operated, and the calculation and recording of the effective value data are restarted at a predetermined time based on the count value of the counter. A measurement timing control means (CPU), a time storage unit (CPU) for storing the time at which the calculation and recording of the effective value data are started and the time at which the calculation and recording are restarted, and displaying the recorded effective value data In doing so, at least the start time stored in the time storage unit, the restart time is displayed, and when the supply of the power to be used is stopped, the recording of the waveform data and the recording of the effective value data are stopped,
In addition to reading out waveform data of one waveform (voltage and current waveforms) until the supply of power is stopped for each of the above channels,
Calculates the effective value based on the same waveform data, compares each effective value with a preset rated value, detects and displays an abnormal channel based on the comparison result, and determines the cause of the power supply stop. And a CPU for informing.

[0010]

With the above configuration, the waveform capturing section captures the detected current and voltage waveform data obtained by each current clamp and voltage probe, and the waveform data is stored in the waveform data recording section in a short time in a ring system. For example, the effective value data is calculated based on the waveform data captured within a certain time (for example, one minute), and is recorded in the effective value data recording unit for a long time (for example, about two weeks).

At this time, the time from the start of the calculation and recording (measurement) of the effective value data is measured by the clock section,
When the current time reaches a predetermined time (eg, 29 minutes or 59 minutes) before a good time (eg, 30 minutes or 0 minutes), the counter (eg, a counter that counts down every second) is set to “59”. Is done.

When this counter is "0" (that is, 1 minute has elapsed)
Then, the above measurement is restarted, the effective value data is calculated again based on the waveform data taken within a fixed time (for example, one minute), and is recorded in the effective value data recording unit for a long time.

Thus, when the display operation for confirming the state of the power consumption is performed, the effective value is displayed based on the effective value data recorded in the effective value data recording section, and The start time and the restart time of the measurement are displayed. However, since this time is not a time, a minute, and a time, but is a good delimitation, such as a time of 30 minutes and a time of 0 minutes, it is easy for the observer to confirm.

When the supply of electric power used via the distribution board is stopped, that is, when the current limiter or the circuit breaker (breaker) of the same distribution board falls due to overload and leakage, etc., the waveform data is output. And the recording of the effective value data are stopped.

Thereafter, an effective value is calculated for each channel based on the waveform data of one waveform until the power failure, and the calculated effective value and the rated current value of the overload breaker, the sensitivity current value of the earth leakage breaker or Fixed line rated voltage (120
V).

As described above, since the comparison according to the measured object (load current, leakage current, line voltage) of each channel is performed, the cause of the power failure is determined based on the comparison result, and the abnormal channel is determined. You can judge.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A power supply monitoring recorder according to the present invention records, for example, waveform data of a load current, a leakage current and a line voltage in a short time in a distribution panel in a ring system, and based on the waveform data for a long time. The calculated effective value data is recorded, and at least the calculation and recording of the effective value data are restarted at a good time (eg, 30 minutes or 0 minutes).

The above-mentioned waveform data is recorded at least until a power failure occurs.
For 6 waveforms, 19.2 waveforms in the case of 60 Hz), the recording of the above-mentioned effective value data is performed, for example, at intervals of 1 minute for about 2 weeks so that the status of the electric power use can be observed. Done.

For this reason, the power supply monitoring record shown in FIG.
The configuration shown in FIG. In the drawing, the same parts as those in FIG. 5 are denoted by the same reference numerals, and the duplicate description will be omitted.

In FIG. 1, a power supply monitoring recorder according to the present invention is connected to a predetermined measuring object in the distribution board 1 in order to measure at least a load current, a leakage current and a line voltage in the distribution board 1. Enabling at least one voltage probe (sensor) 10 and a plurality of current clamps (sensors) 1
1, the voltage probe 10 and the current clamp 11
A plurality of input units 12 for digitally converting the detection signals of the respective channels to be input and fetchable, a waveform fetching unit (memory controller) 13 for fetching these digitally converted waveform data,
A power supply monitoring unit 14 for monitoring the electric power (commercial power supply) used through the distribution board 1, and the waveform data captured by the waveform capturing unit 13 is recorded in a short time in a ring form. Calculates and records effective value data of power consumption (current and voltage) for a long time based on the waveform data, and performs display processing of a measured waveform and a measured effective value based on the waveform data and the effective value data. CPU 15 and waveform data recording section 16 for recording the waveform data
And an effective value data section 17 for recording the calculated effective value data.

The power supply monitoring recorder includes a monitor (LCD) 18 and a printer 19 for displaying and printing measurement results (causes of power failure and analysis results), and a keyboard 20.
And an input / output device 21 comprising:

Further, the input unit 12 of each channel has an amplifier and an A / D which can input a current and a voltage.
It consists of a converter and a photocoupler. The power supply monitoring unit 14 compares at least one of each element of electric power (commercial power supply) used through the distribution board 1 with a reference value (for example, a threshold voltage; 60 V to 70 V), and compares at least one of the elements. A trigger is generated when one of them becomes equal to or less than the reference value, and is provided inside the measuring instrument of the power supply monitoring recorder.

Further, the CPU 15 measures the time from the start of the measurement by the clock unit 15a, and determines and calculates at least the time of the calculation and recording when calculating and recording the effective value data every minute. What time is good 3
A counter unit (SCNT) 15b which counts down every second from, for example, 29 minutes or 59 minutes and becomes "0" after one minute in order to match 0 minutes or what time 0 minutes, and its calculation, recording start time, and restart A time storage unit 15c for storing time.

Next, the operation of the power supply monitoring recorder having the above configuration will be described in detail with reference to the flowcharts of FIGS. 2 and 3 and the time chart of FIG.

First, electric power is used through the distribution board 1, and the current limiter 2 and the circuit breaker 3 of the distribution board 1 are used.
And that the earth leakage breaker 4 has not fallen, it is determined whether or not the CPU 15 has recorded that the measurement has been performed before after the necessary initial setting by turning on the power of the power monitoring recorder. At this time, the CPU
The clock section 15a in 15 keeps track of the current time.

If the power supply monitoring recorder has not taken in the waveform data of each channel and the effective value of the input waveform of each channel has not been calculated, it is determined whether or not to start the measurement. It is determined whether or not the measurement switch of the monitoring recorder is on.

If the measurement switch is on, the measurement item is displayed on the LCD 18 and the measurement item can be selected. When this measurement item is selected with the keyboard 20, each measurement item is selected according to the selected measurement item. The range setting of the channel is displayed on the LCD 18, so that the same range setting can be confirmed.

Subsequently, an instruction to connect the voltage probe 10 and the current clamp 11 of each channel to a predetermined object is displayed on the LCD 18 in accordance with the selected item.

The voltage probe 10 and the current clamp 11
Is connected to a predetermined object to be measured, that is, for example, at a point where a load current, a leakage current, a line voltage, or the like can be measured according to a survey item, or the voltage probe 10, the current, Clamp 11
Is connected, measurement processing is executed.

In this measurement process, recording of waveform data in a short time and recording of effective value data in a long time are performed. At this time, the waveform data is sampled and recorded at a period of, for example, 40 μs (sampling period), and the effective value data is calculated and stored based on the waveform data captured for one minute, for example.

That is, when recording the waveform data captured by the waveform capturing section 13, a predetermined number of waveform data are recorded in the waveform data recording section 16 in a ring manner, and based on the waveform data sampled for a long time. The calculated effective value data is recorded in the effective value data recording unit 17.

In this case, the measurement start time is set to the clock 15
a, and starts the same measurement (calculation of effective value data,
It is stored in the time storage unit 15c as a (recording start) time.

After the start of the measurement, the one-minute interrupt routine shown in FIG. 2 is executed, and the "minute" of the measurement time of the clock section 15a is read (step ST1), and the read "minute" is 29. It is determined whether the time is minutes (minutes, minutes, minutes) or 59 minutes (step ST2).

For example, if the measurement start time is 10:06:30 and it is not 10:29, the waveform data is fetched, and the effective value data is calculated based on the fetched waveform data. The recording is repeated.

When the time reaches 10:29, the counter unit (SCNT) that counts down every second is set to 59 (step ST3), and the processing for setting the interrupt to one second, that is, the one-second interrupt shown in FIG. The process is executed (step ST4).

In the one-second interrupt routine, the counter (SCNT) 15b counts down every second (step ST10), and the counter (SCNT)
When 15b becomes "0" (step ST11), the measurement (calculation and recording of the effective value data) is restarted.

For example, as shown in FIG. 4, since the calculation and recording of the previous effective value data were performed before 10:29, the counter (SCNT) 15b becomes "0" at 10:30. The measurement is restarted every minute, and the calculation and recording (measurement) of the effective value data are started, and the time of this restart is stored in the time storage unit 15c.

The count unit (SCNT) 15b is not "0" before the next calculation and recording (measurement) of the effective value data, that is, 30 minutes before indicated by the two-dot chain line in FIG. The calculation and recording of the effective value data may be performed. As a result, the measurement result before the restart of the measurement (the time indicated by the two-dot chain line in FIG. 4) can also be known.

The measurement start time is, for example, 10: 4
In the case of 5 minutes and 30 seconds, at 10:59, the same processing as described above is performed, and the measurement (calculation and recording of the effective value data) is restarted at 11:00. At this time, the restart time of the measurement is stored in the time storage unit 15c similarly to the first measurement start time.

After the restart, the above-described measurement, that is, the acquisition of the waveform data is performed, and the recording of the waveform data and the recording of the effective value data based on the acquired waveform data are performed.

Here, by operating the keyboard 20 of the input / output device 21 to confirm the use status of the power, the effective value of the power recorded over a long time is displayed on the LCD 18. At the same time, the measurement start and measurement restart times stored in the time storage unit 15c are displayed.

As described above, even if the measurement is started at, for example, 10:06:30, the measurement is restarted at 10:30 and the restart time is stored. When displaying the power consumption, etc., the measurement time displayed at the same time is
Minutes or hours and minutes are good and are very easy for the observer to see and understand.

On the other hand, during the measurement, when the breaker (current limiter 2 or circuit breaker 3) of the distribution board 1 falls for some reason, each of the commercial power of the electric power passing through the distribution board 1 Since at least one of the elements is equal to or smaller than the reference value, a signal (trigger) is generated from the power supply monitoring unit 14.

At this time, the measurement in the power supply monitoring recorder is stopped by the trigger, but the waveform data recording section 16 records the waveform data of the 320 ms waveform up to the power failure.

Subsequently, it is determined whether or not the stop state has been manually generated. That is, the power supply monitoring recorder can be stopped not only by the trigger from the power supply monitoring unit 14 but also by, for example, the operation of stopping the power supply monitoring recorder (turning off the measurement switch).

In the case of the manual stop, when the measurement switch is turned on, the measurement is started again. Also,
In the case of a stop due to a signal (trigger) from the power supply monitoring unit 14, that is, in the case of a power failure, the fact that the measurement of the DUT is being performed is stored.

After the power failure, when the power of the power supply monitoring recorder is turned on again, a power failure cause analysis and display routine is executed.

First, similarly to the above measurement, it is determined whether or not the measurement has been performed before the power failure by turning on the power again. Since the waveform data is recorded in the waveform data recording section 16 and the effective value data is recorded in the effective value data recording section 17, the voltage probe 10 connected to the object to be measured and the current For each channel of the clamp 11, a calculation is performed based on the waveform data for one waveform, with one waveform up to the power failure as an effective value.

Subsequently, the calculated effective value of each channel is compared with a preset rated value (rated value input before measurement). This rated value is the rated current value of the current limiter 2, the wiring breaker 3, the sensitivity current value of the earth leakage breaker 4, and the fixed line-to-line rated voltage value (for example, 120 V).
It is.

In this case, for example, the effective value (measured value of the line voltage) of the waveform data detected by the voltage probe 10 is compared with the line voltage value (120 V), and the waveform data detected by the plurality of current clamps 11 is compared. The effective value of (leakage current and load current) is compared with the sensitivity current value and the rated current value, respectively.

According to the result of the comparison, if the measured value (effective value) of the line voltage exceeds 120 V, it is determined that the phase is open, and the measured value (effective value) of the leakage current exceeds the sensitivity current. If the measured value (effective value) of the load current exceeds the rated current, it is determined that an electric leakage has occurred.

Then, it is determined whether or not the measurement result of each channel is abnormal, the channel determined to be abnormal is displayed on the screen of the LCD 18, and the cause of the power failure operation, that is, the above-mentioned phase loss, leakage, or overload. Is displayed on the same screen.

As described above, the display screen of the LCD 18 makes it possible to know which channel is abnormal and the cause of the power failure, so that even ordinary persons who are not experienced in measurement can easily understand the cause of the power failure.

Further, based on the waveform data recorded in the waveform data recording section 16, the analysis of the waveform according to the purpose, for example, the harmonic analysis is performed, and the waveform is recorded in the effective value data recording section 17. A display process of the effective value is performed based on the effective value data.

[0055]

As described above, according to the power supply monitoring recorder of the present invention, the load current,
Leakage current and line voltage are detected by a plurality of current clamps and voltage probes, and the waveform data obtained by digitally converting the detection signal of each channel is recorded in a short time in a ring format, and the effective value data based on the waveform data is recorded. Record for a long time, measure the time from the start of the measurement, and restart the effective value data and recording time of the measurement according to the predetermined time, and then restart the effective value, measurement start time, The start time can be displayed, the used electric power (commercial power supply) is monitored, and when the supply of used electric power is stopped (power failure), a predetermined number of waveform data up to the same power failure is recorded. The RMS value is calculated based on the waveform data, and the RMS value is compared with various preset values (current sensing value, rated current value, line voltage value). The cause of the power failure is determined, and the abnormal channel and the cause of the power failure are displayed on a screen such as an LCD, so that the state of the power consumption can be known for a long time, and the measurement of the power consumption is interrupted. (Restart) at a good time, it is easy to find the measurement start time (restart time) when trying to check the status of the power consumption. When the supply is stopped, the cause of the supply stop can be easily known on the screen.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of a power supply monitoring recorder showing an embodiment of the present invention.

FIG. 2 is a schematic flowchart illustrating the operation of the power supply monitoring recorder shown in FIG.

FIG. 3 is a schematic flowchart illustrating the operation of the power supply monitoring recorder shown in FIG. 1;

FIG. 4 is a schematic time chart illustrating an operation of starting a measurement in the power supply monitoring recorder shown in FIG. 1;

FIG. 5 is a schematic block diagram of a distribution board.

FIG. 6 is a schematic waveform diagram of an AC voltage and an AC current of electric power used via the distribution board shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Distribution board 2 Current limiter 3 Wiring breaker 4 Leakage breaker 10 Voltage probe (sensor) 11 Current clamp (sensor) 12 Input unit 13 Waveform acquisition part (memory controller) 14 Power supply monitoring part 15 CPU 15a Clock part 15b Counter unit (SCNT) 15c Time storage unit 16 Waveform data recording unit 17 Effective value data recording unit 18 Monitor (LCD) 19 Printer 20 Keyboard 21 Input / output device

 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Eiji Kogure 1-3-3 Uchisaiwai-cho, Chiyoda-ku, Tokyo Inside Tokyo Electric Power Company (56) References JP-A-59-202023 (JP, A) JP-A-1 −160317 (JP, A)

Claims (1)

(57) [Claims] 1. A plurality of current clamps for detecting a load current and a leakage current and at least one voltage probe for detecting a line voltage, and the detected current and the voltage are inputted for each channel, and the input current and the voltage signal are inputted. Input means for digitally converting the input data, input means for inputting the waveform data digitally converted by the input means for each channel, waveform data recording means for recording the input waveform data in a ring system, Calculating means for calculating the effective value based on the waveform data to obtain the effective value data; effective value data recording means for recording the calculated effective value data; and at least one of the elements of the commercial power of the power to be used and a reference Power supply monitoring means for monitoring the commercial power supply, and detecting the load current, the leakage current and the line voltage, and detecting the detected current and the voltage. When calculating and recording the effective value data based on the waveform data, at least when calculating the effective value data, a clock means for measuring the time from the start of recording, and reading the time by the clock means, according to the read time Measurement timing control means for restarting the calculation and recording of the effective value data at a predetermined time, and storing the time when the calculation and recording of the effective value data are started and the restart time of the calculation and recording. Time storage means, when displaying the recorded effective value data, at least a start time stored in the time storage means, a restart time is displayed, and when the supply of the power to be used is stopped, the waveform data is recorded and Stop the recording of the effective value data, and wait for 1
The waveform data of the waveforms (voltage and current waveforms) are read out, an effective value is calculated based on the waveform data, each effective value is compared with a preset rated value, and an abnormal channel is determined based on the comparison result. And a control means for detecting, displaying, and judging and reporting the cause of the power supply stop.