JPH05264295A - Power source monitoring recorder - Google Patents

Abstract

PURPOSE:To judge the cause of a service interruption according to the voltage and current waveforms at the time of supply stop (service interruption) of a using power, and display it so that the cause of service interruption can be easily found. CONSTITUTION:The waveform data of load current, leak current and line voltage is fetched to a waveform fetch part 13 every channel in a distribution board 1, the fetched waveform data is recorded timewise in ring type in a waveform data recording part 16, and the effective value of the waveform data is recorded in an effective value data recording part 17 in point of long time. A using power (commercial power source) is monitored by a power source monitoring part 14, recording is stopped by the supply stop of the using power (measurement is stopped). One waveform up to the service interruption is converted to an effective value by a CPU 15, the effective value is compared with a preset rated value to judge the cause of the service interruption, and the cause and an abnormal channel are displayed on a monitor (LCD).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention records the waveforms of load current, leakage current and line voltage in a distribution board in a short time, and records the effective value of the waveform for a long time. Stopping the supply of power used through the distribution board (that is, power failure)
The present invention relates to a power supply monitoring recorder that analyzes and determines the cause of the above and notifies the determination result.

[0002]

[Prior art] In recent years, power has come to be used via a distribution board regardless of the demand for electric lights or the demand for commercial power.
As shown in FIG. 5, an overload circuit breaker (current limiter, wiring circuit breaker) 2,
3 and an earth leakage breaker 4 are provided.

If the power to be used exceeds the permissible range of the current limiter 2 and the circuit breaker 3 for each wiring, the relays of the current limiter 2 and the circuit breaker 3 for each wiring are activated, or the electric leakage occurs. Occurs, the relay of the earth leakage breaker 4 operates.

Therefore, even if the rating is exceeded or the electric leakage occurs, the supply of electric power is immediately stopped, so that it is possible to prevent the occurrence of fire or the like, and the safety is extremely high.

By the way, in order to know the cause of power supply stoppage, that is, power failure, through the distribution board 1, 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 measurement, for example, short-time waveform recording by the distribution board 1 and long-term effective value recording cannot be performed at the same time. A device for recording and a device for long-term waveform recording are required, and a plurality of devices are required according to the survey items such as load current, leakage current and line voltage. 1 must be installed as an external device.

Further, as shown in the waveform diagrams of the AC voltage and the AC current in FIG. 6, during the power failure, the waveforms of the AC voltage and the AC current up to the power failure (shown in a and b in the same figure) can be measured. It is possible, but it is difficult to determine from the same measured waveform the cause of the above power failure, for example, whether it is due to overload, leakage, open phase, etc. There is a problem that can not be analyzed. 5A shows an AC voltage waveform, and FIG. 5B shows an AC current waveform.

The present invention has been made in view of the above problems, and an object thereof is to automatically eliminate the cause of power supply stoppage (power failure) of electricity used via a distribution board without requiring many measuring devices. An object of the present invention is to provide a power supply monitoring recorder which can be judged and displayed, and which enables an ordinary person 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 load current, a current clamp for detecting a leakage current, and at least one voltage probe for detecting a line voltage. An input unit that inputs the detected current and voltage for each channel (channel) and digitally converts at least the same input voltage and current signals, and a waveform acquisition unit that acquires the waveform data digitally converted by the input unit of each channel, A waveform data recording unit for recording the captured waveform data in a ring system, and an arithmetic processing unit for calculating an effective value based on the captured waveform data to obtain effective value data (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 each element of the commercial power source of the electric power used with a reference value, and monitors the electric 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, current waveform) until the supply of the power is stopped is read for each channel, and the same waveform data is also read. Calculate the effective value based on, compare the effective value with the preset rated value, detect the abnormal channel based on the comparison result, execute the display process, and determine the cause of the power supply stop, The gist is to have a CPU that executes the notification process.

[0010]

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

When the supply of electric power to be used through the distribution board is stopped, that is, when the current limiter or the circuit breaker for the wiring of the distribution board goes down due to overload or leakage, a power failure occurs. The recording of 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, the rated current value of the overload circuit breaker, and the sensitivity current value of the earth leakage circuit breaker or Fixed line voltage rating (120
V) is compared.

In this way, since the comparison is made according to the measured object (load current, leakage current, line voltage) of each channel, the cause of the power failure is judged from the comparison result, and the abnormal channel Is determined and the cause of the abnormal channel and power failure is displayed on the screen of the LCD or the like.

Therefore, the cause of the power failure 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 survey items (load current, leakage current, line voltage). It is not necessary to provide a new channel, and a new survey item can be dealt with by increasing the number of channels in advance.

On the other hand, since the effective value data is recorded in the effective value data recording section for a long time, the power used through the distribution board is used for a long time (for example, about two weeks).
It can also be used for surveying the power usage status, for example.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A power supply monitoring recorder according to the present invention records waveform data of load current, leakage current and line voltage in a ring system in a short time in a distribution board, and for a long time based on the waveform data. It records the effective value data that is calculated dynamically.

The recording of the above waveform data is at least a predetermined number of waveform data until a power failure (for example, 1 at 50 Hz).
6 waveforms, 19.2 waveforms in the case of 60 Hz) are recorded, and the recording of the effective value data is performed, for example, for about 2 weeks so that the state of power usage can be observed.

Therefore, the power supply monitoring record is shown in FIG.
It has the configuration shown in. In the figure, the same parts as those in FIG.

In FIG. 1, the power supply monitoring recorder of the present invention is connectable to a predetermined object to be measured in the distribution board 1 in order to measure at least load current, leakage current and line voltage in the distribution board. And at least voltage probe (sensor)
10 and a plurality of current clamps (sensors) 11, a plurality of input units 12 capable of inputting the detection signals of the respective channels (channels) by the voltage probe 10 and the current clamps 11, and digitally converting the detection signals, and these. A waveform capturing unit (memory controller) 13 for capturing digitally converted waveform data,
A power supply monitoring unit 14 that monitors 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 ring system in a short time, and Calculates and records the effective value data of the used power (current, voltage) for a long time based on the waveform data and records the measured waveform and the measured effective value based on the waveform data and the effective value data. CPU 15 and waveform data recording unit 16 for recording the above waveform data
And an effective value data section 17 for recording the calculated effective value data.

Further, this power supply monitoring recorder has a monitor (LCD) 18 and a printer 19 for displaying and printing measurement results (causes of power failure, analysis results) and the like, and a keyboard 20.
And an input / output device 21 composed of

Further, the input unit 1 for each of the above channels
Reference numeral 2 is composed of an amplifier capable of inputting current and voltage, an A / D converter, and a photocoupler. Furthermore, the power supply monitoring unit 14 compares at least one of each element of the electric power (commercial power supply) used via the distribution board 1 with a reference value (for example, threshold voltage; 60V to 70V), and then compares each element. It is configured to generate a trigger when at least one of them falls below a 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 structure will be described in detail with reference to the flow charts of FIGS.

First, electric power is used through the distribution board 1, and the current limiter 2 and the wiring breaker 3 of the distribution board 1 are used.
If it is assumed that the earth leakage breaker 4 has not descended, it is determined whether or not a record indicating that the measurement was previously performed is made in the CPU 15 after the initial setting required by turning on the power supply of the power supply monitoring recorder ( Step ST1).

When the waveform data of each channel is not captured by the power supply monitoring recorder and the effective value of the input waveform of each channel has not been calculated, it is judged whether or not to start the measurement, that is, the same power supply. It is determined whether or not the measurement switch of the surveillance recorder is on (step ST
2).

When 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, which allows confirmation of the same range setting (step ST4).
The range setting of each channel can be set by the operation unit provided in the main body of the power monitoring recorder 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 in accordance with the selected item (step ST5).

The voltage probe 10 and the current clamp 11
Is connected to a predetermined object to be measured, that is, a place where load current, leakage current, line voltage, etc. can be measured, or the voltage probe 10 and the current according to the instruction of the LCD 18 are measured. Clamp 11
Is connected, the measurement process is executed (step S
T6).

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

That is, when recording the waveform data captured by the waveform capturing unit 13, a predetermined number of waveform data are recorded in the waveform data recording unit 16 in a ring type, 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 unit 16 always stores, for example, a waveform portion of 320 ms (16 at 50 Hz).
Waveform data, that is, 19.2 waveforms in the case of 60 Hz) is constantly recorded in a ring system, 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 recorded in the effective value data recording unit 17
Will be recorded in sequence.

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

When the breaker (current limiter 2 or circuit breaker 3 for the distribution board) of the distribution board 1 goes down for some reason, at least one of the elements of the commercial power source for the electric power through the distribution board 1 Therefore, a signal (trigger) is generated from the power supply monitoring unit 14.

At this time, although the measurement in the power supply monitoring recorder is stopped by the trigger, the waveform data recording unit 16 records waveform data of 320 ms of waveform until the power failure.

Then, it is judged whether or not the stop state is caused 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 of the power supply monitoring recorder (measurement switch off operation).

In the case of the manual stop, the process returns to 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 the stop due to the signal (trigger) from the power supply monitoring unit 14, that is, in the case of the power failure, the fact that the measurement object is being measured is stored (step 9).

After the power failure, when the power of the power supply monitoring recorder is turned on again, the analysis and display routine of the cause of the power failure shown in FIG. 3 is executed. The routine shown in FIG. 3 is executed even when the measurement was previously being performed in step ST1 of the routine shown in FIG.

First, in the same manner as the measurement routine shown in FIG. 2, the power is turned on again (step ST10) to judge 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, the step ST1 is performed.
Proceed to 2 and the voltage probe 1 connected to the DUT.
For each channel of 0 and the current clamp 11, a calculation is performed on the basis of the waveform data for one waveform, with one waveform (shown in the graph of FIG. 5) as the effective value until the power failure.

Subsequently, the calculated effective value of each channel and the preset rated value (rated value input before measurement)
And are respectively compared (step ST13). This rated value is the rated current value of the current limiter 2, the circuit breaker 3 for wiring, 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 rated current value, respectively.

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

Then, it is determined whether or not the measurement result in 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, electric leakage or overload. A message is displayed on the same 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 a person who is 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, a waveform analysis according to the purpose, for example, a harmonic analysis is performed, and 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, the waveform of the power used (AC voltage, AC current) can be observed on the screen of the LCD 18,
Moreover, it is possible to know the effective value of the electric power used for a long time (about two weeks).

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

[0047]

As described above, according to the power supply monitoring recorder of the present invention, at least the load current in the distribution board,
The leak current and line voltage are detected by multiple current clamps and voltage probes, and the waveform data obtained by digitally converting the detection signals of each channel are recorded in a ring format in a short time, and the effective value data based on the waveform data is recorded. It records for a long time and monitors 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, the effective value is calculated based on the waveform data of one waveform up to the power failure, and the same effective value and various preset ratings are set. Compare the values (sensed current value, rated current value, line voltage value), determine the cause of the power failure by this comparison result, and display the abnormal channel and the cause of the power failure on the screen of LCD etc. Therefore, if there is a power supply stoppage through the distribution board, the cause of the power supply stoppage can be easily seen on the screen, and the state of the power supply used can be known for a long time. There is a useful effect that can be.

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 attached to the distribution board, and the survey items (load current, leakage current, line spacing) can be attached. It is not necessary to provide many measuring devices externally depending on the voltage, etc., and it is possible to deal with new survey items by increasing the number of channels in advance.

[Brief description of 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.

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. 4. FIG.

[Explanation of symbols]

 1 Distribution board 2 Current limiter 3 Wiring circuit breaker 4 Leakage breaker 10 Voltage probe (sensor) 11 Current clamp (sensor) 12 Input unit 13 Waveform capture unit (memory controller) 14 Power supply monitoring unit 15 CPU 16 Waveform data Recording unit 17 Effective value data recording unit 18 Monitor (LCD) 19 Printer 20 Keyboard 21 Input / output device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiaki Fusegawa 1-3-3 Uchisaiwaicho, Chiyoda-ku, Tokyo Within Tokyo Electric Power Company (72) Eiji Kogure 1-3-1 Uchisaiwaicho, Chiyoda-ku, Tokyo Within Tokyo Electric Power Company

Claims (2)

[Claims] 1. A plurality of current clamps for detecting load current and leakage current, and at least one voltage probe for detecting line voltage, and inputting the detected current and voltage for each channel. Input means for digitally converting the respective waveforms, a capturing means for capturing the waveform data digitally converted by the input means of each channel, a waveform data recording means for recording the captured waveform data in a ring format, and the captured data. A calculating means for calculating the effective value based on the waveform data to obtain the effective value data, an effective value data recording means for recording the calculated effective value data, and at least one of each element of the commercial power source of the electric power to be used and the reference. Power supply monitoring means for monitoring the commercial power source by comparing the measured value with the value, and recording the waveform data and the effective value data when the power to be used is stopped. Stop recording, the one waveform to the power supply stop for each channel (voltage, current waveform)
While reading the waveform data of, the effective value is calculated based on the same waveform data, the effective value is compared with the preset rated value, and the abnormal channel is detected based on the comparison result.
A power supply monitoring recorder, comprising: a control unit for displaying and determining and notifying the cause of the power supply stop. 2. The preset rated value is at least a sensitivity current value of an earth leakage breaker and a rated current value of an overload circuit breaker provided in a distribution board, and the load current and the leakage current are based on the waveform data. The effective value of the current and the line voltage is calculated, and when the effective value of the leakage current is larger than the sensitivity current, it is determined as leakage, and when the effective value of the same load current is larger than the rated current, it is determined as overload, The power supply monitoring recorder according to claim 1, wherein when the effective value of the line-to-line voltage is larger than the fixed line-to-line rated voltage, it is determined that the phase is open.