JP2741130B2 - 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 comprises a current clamp for detecting a load current, a leakage current, and at least one voltage probe for detecting a line voltage. An input unit for inputting a detection current and a voltage for each channel (channel) and digitally converting at least the same input voltage and current signal, a waveform capturing unit for capturing waveform data digitally converted by the input unit of each channel; A waveform data recording unit for recording the acquired waveform data in a ring form; and an arithmetic processing means for calculating an effective value based on the acquired waveform data to obtain effective value data (a CP (described later)).
U), an effective value data recording unit that records the calculated effective value data, a power supply monitoring unit that compares at least one of the elements of the commercial power supply to be used with a reference value, and monitors the power. 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, and the waveform data of one waveform (voltage and current waveforms) until the supply of power is stopped is read out for each channel. Based on the calculated effective value, comparing the effective value with a preset rated value, based on the comparison result, to detect an abnormal channel, execute display processing, and determine the cause of the power supply stop, The gist of the invention is to provide a CPU for executing the notification process.

[0010]

With the above configuration, the waveform capturing section captures the current and voltage waveform data detected by each clamp and probe, and this waveform data is recorded in the waveform data recording section in a short time in a ring system. On the other hand, the effective value data obtained based on the waveform data is recorded in the effective value data recording unit for a long time.

When the supply of electric power used through the distribution board is stopped, that is, when a current limiter or a circuit breaker (breaker) of the same distribution board is dropped 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. Is determined, and the abnormal channel and the cause of the power failure are displayed on a screen such as an LCD.

Therefore, the cause of the power outage can be easily understood by ordinary persons, even if they are not experienced in measurement, and many measuring devices are externally connected according to the above-mentioned investigation items (load current, leakage current, line voltage). Need to be provided, and by increasing the number of channels in advance, it is possible to deal with new survey items.

On the other hand, since the effective value data is recorded in the effective value data recording section for a long time, the electric power used through the distribution board is reduced for a long time (for example, about two weeks).
And can be used, for example, for investigating the state of power use.

[0016]

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 effective value data calculated in a typical manner is recorded.

The above-mentioned waveform data is recorded at least until a power failure occurs.
The recording of the effective value data is performed, for example, for about two weeks so that the state of the power consumption can be observed.

For this reason, the power supply monitoring record shown in FIG.
The configuration shown in FIG. In the figure, the same parts as those in FIG. 4 are denoted by the same reference numerals, and the duplicate description will be omitted.

In FIG. 1, the power supply monitoring recorder of the present invention can be connected to a predetermined DUT 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. At least the voltage probe (sensor)
10 and a plurality of current clamps (sensors) 11, a plurality of input units 12 for enabling each of the detection signals of each channel (channel) by the voltage probe 10 and the current clamp 11 to be input, and for digitally converting the signals to be fetchable; A waveform capturing unit (memory controller) 13 for capturing 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 (the cause of power failure, analysis results) and the like, and a keyboard 20.
And an input / output device 21 comprising:

Further, the input unit 1 of each of the above channels
Reference numeral 2 denotes an amplifier, an A / D converter, and a photocoupler capable of inputting current and voltage. Furthermore, the power supply monitoring unit 14 compares at least one of the elements of the electric power (commercial power supply) used via the distribution board 1 with a reference value (for example, a threshold voltage; 60 V to 70 V), and The trigger is generated when at least one of them falls below the reference value, and is provided inside the measuring instrument of the power supply monitoring recorder.

Next, the operation of the power supply monitoring recorder having the above configuration will be described in detail with reference to flowcharts shown in FIGS.

First, electric power is used via 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 off, it is determined whether or not the CPU 15 has recorded that the measurement was previously being performed in the CPU 15 after the initial setting required by turning on the power supply of the power supply monitoring recorder ( Step ST1).

If the power supply monitoring recorder has not taken in the waveform data of each channel and has not calculated the effective value of the input waveform of each channel, it is determined whether or not to start the measurement. It is determined whether the measurement switch of the monitoring recorder is on (step ST).
2).

If the measurement switch is turned on, the measurement item is displayed on the LCD 18, and the measurement item can be selected (step ST3).
If 0 is selected, the range setting of each channel is displayed on the LCD 18 in accordance with the selected measurement item, whereby the same range setting can be confirmed (step ST4).
Note that the range setting of each channel can also be set by the operation unit provided in the power supply monitoring recorder main body or the keyboard 20 of the input / output device 21.

Subsequently, an instruction to connect the voltage probe 10 and the current clamp 11 of each channel to a predetermined object to be measured is displayed on the LCD 18 according to the selected item (step ST5).

The above voltage probe 10 and current clamp 11
Is connected to a place where the load current, leakage current, line voltage, etc. can be measured according to a predetermined object to be measured, that is, a survey item, or the voltage probe 10, the current, Clamp 11
Is connected, the measurement process is executed (step S
T6).

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, for example, a 40 μs cycle (sampling cycle), and the effective value data is calculated and stored based on, for example, the waveform data captured for one minute.

That is, when recording the waveform data captured by the waveform capturing unit 13, a predetermined number of waveform data is recorded in the waveform data recording unit 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 waveform data recording section 16 always has a waveform of 320 ms (16 Hz for 50 Hz).
(19.2 waveforms at 60 Hz) is always recorded in a ring format, while the effective value data recording unit 17 is operated for a long time, for example, for about two weeks. The effective value data is stored in the effective value data recording unit 17
Are sequentially recorded.

Subsequently, it is determined whether or not the power supply monitoring recorder is in a stopped state (step ST7). If there is no abnormality and the power monitoring recorder is not in a stopped state, the measurement processing is continued.

Here, when the breaker (current limiter 2 or wiring breaker 3) of the distribution board 1 falls for some reason, at least one of the components of the commercial power source of the electric power passing through the distribution board 1 is turned off. Since one of them is equal to or less 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 above-mentioned stop state has occurred manually (step ST8). That is,
This is because the power supply monitoring recorder can be stopped not only by a trigger from the power supply monitoring unit 14 but also by, for example, a stop operation (a measurement switch off operation) of the power supply monitoring recorder.

In the case of the manual stop, the process returns to the step ST2. Therefore, when the measurement switch is turned on, the steps are repeated, and the measurement is started again. Further, 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 outage, the fact that the measurement of the DUT is being performed is stored (step 9).

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 shown in FIG. 3 is executed. It should be noted that the routine shown in FIG. 3 is also executed in the case where the measurement was previously performed in step ST1 of the routine shown in FIG.

First, similarly to the measurement routine shown in FIG. 2, the power is turned on again (step ST10), and it is determined whether or not the measurement is performed before the power failure (step ST11).

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, step ST1 is executed.
Proceeding to step 2, the voltage probe 1 connected to the object to be measured
0, for each channel of the current clamp 11, based on the waveform data of one waveform, an operation is performed using one waveform (shown in the graph of FIG. 5) as an effective value until the power failure.

Subsequently, the calculated effective value of each channel and a preset rated value (rated value input before measurement)
Are compared with each other (step ST13). These rated values are the rated current value of the current limiter 2 and the wiring breaker 3, the sensitivity current value of the earth leakage breaker 4, and the fixed line rated voltage value (for example, 120 V).

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.

As a 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-described phase loss, leakage, or overload. Is displayed on the screen (ST14).

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. Display processing of the effective value is performed based on the effective value data (step ST15).

As a result, it is possible to observe the waveform of the power consumption (AC voltage, AC current) on the screen of the LCD 18,
In addition, it is possible to know the effective value of the power consumption for a long time (about two weeks).

In the above power supply monitoring recorder,
By increasing the number of channels in advance, according to the survey items other than the above-mentioned survey items, or according to the number of objects to be measured of the distribution board 1, for example, when the number of breakers 3 is large, the clamp, It is only necessary to increase the number of probes, and there is an effect that it is not necessary to increase the number of measuring devices as in the conventional example corresponding to each object to be measured.

[0047]

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, the waveform data obtained by digitally converting the detection signals of each channel are 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, monitor the power used (commercial power),
When the supply of used power is stopped (power failure), the waveform data of a predetermined number of waveforms up to the power failure is recorded, and the effective value is calculated based on the waveform data of one waveform up to the power failure. Values (current sensing value, rated current value, line voltage value), the cause of the power failure is determined based on the comparison result, and the abnormal channel and the cause of the power failure are displayed on a screen such as an LCD. Therefore, when the power supply via the distribution board is stopped, it is possible to easily know the cause of the power supply stop on the screen and to know the state of the power consumption for a long time. There is a useful effect that can be done.

Further, according to the power supply monitoring recorder of the present invention, the power supply monitoring unit for monitoring the commercial power supply can be mounted on the distribution board, and the investigation items (load current, leakage current, line-to-line It is not necessary to provide many measuring devices externally according to the voltage, etc.), and by increasing the number of channels in advance, it is possible to deal with new investigation items.

[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 block diagram of a distribution board.

5 is a schematic waveform diagram of AC voltage and 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 16 Waveform data Recording unit 17 Effective value data recording unit 18 Monitor (LCD) 19 Printer 20 Keyboard 21 I / O device

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshiaki Fusegawa 1-3-1 Uchisaiwaicho, Chiyoda-ku, Tokyo Inside Tokyo Electric Power Company (72) Eiji Kogure 1-1-3 Uchisaiwaicho, Chiyoda-ku, Tokyo Tokyo (56) References JP-A-59-202023 (JP, A) JP-A-1-160317 (JP, A)

Claims (2)

(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, recording the waveform data and ending the effective value data when the supply of the used power is stopped. Stop recording, the one waveform to the power supply stop for each channel (voltage, current waveform)
While reading the waveform data, the RMS value is calculated based on the waveform data, each RMS value is compared with a preset rated value, and an abnormal channel is detected based on the comparison result.
And a control means for displaying and judging and reporting the cause of the power supply stop. 2. The preset rated values are at least a sensitivity current value of an earth leakage breaker provided on a distribution board and a rated current value of an overload circuit breaker. The effective value of the current and the line voltage is calculated, and when the effective value of the current of the leakage is larger than the sensitivity current, it is determined that the current is short-circuited. 2. The power supply monitoring recorder according to claim 1, wherein when the effective value of the line voltage is larger than a fixed line rated voltage value, it is determined that the phase is open.