JP3029922B2 - Portable digital recording device and security system for electrical equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention enables easy and reliable collection and analysis of information necessary for maintenance and maintenance of electrical equipment, and enables quick and accurate maintenance of electrical equipment. The present invention relates to a security system for a recording device and electrical equipment.

[0002]

2. Description of the Related Art Leakage current and deterioration of high-voltage cables in electrical equipment installed in ordinary households, stores, and companies, etc., may cause disasters such as electrical leak fires and electric shocks. Constantly monitor the occurrence of
In addition, by performing various equipment inspections as necessary,
It is very important to prevent the accident before it happens by investigating the cause of the leakage and the deterioration of the cable and taking appropriate measures. In such monitoring and inspection, various measuring devices, which will be described later, are properly used depending on the purpose, and the measurement results obtained by those measuring devices are used to determine the cause of subsequent leakage or cable deterioration. The information is recorded by a predetermined method so as to be used for analysis and equipment diagnosis. Conventionally, regardless of what kind of measuring device is used as a recording device for the recording, in other words, regardless of the purpose of the measured data, An analog recording device of a type that prints the output from a measuring device on recording paper as it is by a recording method or a dot recording method has been used.

[0003]

However, since the analog recording apparatus has a mechanically movable portion for transporting the recording paper, the recording paper may be caught halfway and not sent to the end. There are various troubles caused by the physical structure of the apparatus, such as that printing cannot be performed because the ink dries and does not come out during printing, and conversely, the recording paper is broken due to too much ink. there were.

Further, when recording, it is necessary to check the remaining amount of ink and recording paper, and to replenish them if necessary, especially when performing measurement recording over a long period of time. Due to the length of the paper, such a refilling operation was an inevitable effort. In order to utilize this for subsequent data analysis, equipment diagnosis, etc., additional manual labor such as cutting at regular intervals and arranging and attaching them to reports etc. is required, so the work efficiency of data processing is remarkable descend. Moreover, it is not easy to determine the cause of the leakage and to judge the deterioration of the cable based on such data. As a result, it takes a lot of work to complete a series of security operations. There was a problem.

Further, as described above, since the analog recording apparatus records data by the same means irrespective of the type of target measurement data, it is indispensable for investigating the cause of the occurrence of electric leakage or cable deterioration in equipment. There is a problem that accurate data cannot always be obtained or accurate recording cannot be performed. Specifically, these problems are, in particular, that electrical leakage often occurs instantaneously over a long period of time, such as once a week or once a month, and data showing such instantaneous changes in current or its data. Data showing the situation before and after is often not able to be measured in inspections and regular inspections after notification of the occurrence of equipment abnormalities, and in measurement for cable deterioration diagnosis,
Due to the limitations of the mechanical structure of the analog recording device, it is difficult to reliably follow the so-called kick phenomenon in which the measured current changes greatly instantaneously. Therefore, the original data measured by the measuring device is faithfully recorded. The problem is that you can't.

The present invention has been made in view of the above-mentioned problems, and can easily and reliably record output information from various measuring devices, and can easily diagnose electric equipment from the recorded information. It is an object of the present invention to provide a recording apparatus and a security system for electrical equipment, which can obtain necessary information and perform security work for electrical equipment quickly and accurately.

[0007]

A portable digital recording apparatus according to the present invention is a recording apparatus which is used by connecting to a measuring apparatus for measuring a voltage or a current value required for securing electrical equipment. Input means for inputting an analog output signal or digital data output from the input device, amplifying means for amplifying an analog output signal of the measuring device input via the input means, and the analog output amplified by the amplifying means A / D converter for converting a signal into digital data, data storage means for storing digital data input via the input means or digital data output from the A / D converter, and the data storage means Digital data is stored from the first area to the last area of the first area, and when storage in the last area is completed, the first area is stored again. The storage operation is continued by restarting the storage from, and when predetermined information is obtained in the process of the continuous storage, control is performed so as to stop the storage operation after continuing the storage for a predetermined period from that time. And control means. Setting means for setting a data sampling time interval in the A / D converter and a data storage time interval in the data storage means; and setting the input means during the storage time interval set by the setting means. Control means for selecting a maximum value from digital data input through the A / D converter or digital data input from the A / D converter, and controlling the maximum value to be stored in the data storage means. Is also good.

[0008] The security system for electrical equipment according to the present invention, wherein the portable digital recording device further comprises communication means for transferring digital data stored in the data storage means to a data processing device, and the portable digital recording device. A data processing device that fetches digital data stored in the data storage means and performs data processing for generating information necessary for security of electrical equipment; and displays or prints a data processing result by the data processing device. And output means for outputting the output.

[0009]

As described above, according to the present invention, information input from the input means is temporarily stored in the data storage means in the form of digital data. This storage is appropriately controlled by the control unit based on the sampling time interval and the data storage time interval set by the setting unit. That is, a maximum value is selected from a plurality of digital data sampled at each set sampling time interval at each data storage time interval, and the selected digital data is shifted from the first area to the last area of the data storage means. , And when the storage in the last area is completed, the storage is restarted from the first area again. Then, when predetermined information is obtained in the process of the continuous storage, the storage operation is stopped after the storage is continued for a predetermined period from that time. The data stored in the data storage means is transferred to the data processing device via the communication means, and the data processing device generates information necessary for securing the electrical equipment based on the transferred data. Is performed.

[0010]

FIG. 1 is a block diagram showing the configuration of a security system for electrical equipment to which the present invention is applied.

In FIG. 1, a portable digital recording device 1 includes an external input control unit 2 and an operational amplifier 3.
a, 3b, A / D converter 4, control unit 5, RAM 6, RO
M7 and an RS-232C interface 8 as communication means, and a personal computer 10 (for example, a personal computer “5
2 NOTE ”) is connected via the RS-232C interface 8.

The external input control unit 2 includes a system for inputting an analog output signal output from an analog measuring device such as a digital clamp meter 20 through a terminal 9 and a radiation thermometer 5.
And a system for inputting digital data output from a digital measuring device such as 0 through an input terminal 9.

Operational amplifiers 3a, 3b, A / D converter 4
Operates when an analog signal is input to the external input control unit 2, and converts the input analog signal into an operational amplifier 3a,
After the signal is amplified to a predetermined level in 3b, the signal is converted into digital data by the A / D converter 4.

The control unit 5 is substantially a CPU (not shown).
(For example, TMPZ84C015A), a programmable oscillator, and the like, and controls the entire recording apparatus 1 based on a program stored in the ROM 7.

The RAM 6 is a battery that is backed up by a battery, and stores digital data input through the external input control unit 2 or digital data output from the A / D converter 4 for a time specified by the control unit 5. It is stored at intervals.

The RS-232C interface 8 is an input / output interface conforming to the international standard. By using this interface, versatility can be given to data communication between the recording apparatus 1 and the personal computer 10.

The personal computer 10 performs a predetermined operation or the like on digital data obtained from the recording device 1 via the interface 8 to generate information necessary for the security of the electrical equipment. It is configured so that it can be displayed on a display unit or printed out. 2 and 3 show that the computer 10 is a recording device 1
FIG. 4 is a diagram showing an example in which the measured data obtained from the above are arranged and output as a graph or a frequency distribution table. FIG. FIG. 5 is a diagram showing an example in which data in an arbitrary measurement period is selected and output in order to observe a part of the measurement data in detail.

FIG. 6 is a diagram showing the appearance of the recording apparatus 1. The recording device 1 includes an instruction for various controls executed by the control unit 5, a switch SW for designating information related to the control, an LED 1 for confirming a power display, and a confirmation for confirming data transfer. An LED 2 and an LED 3 for confirming storage of data are provided.

The switch SW has seven switches SW1.
~ SW7. The switch SW1 is connected to the RAM6
Is for instructing the transfer of the measurement data stored in the RAM 6 to the computer 10. After the storage of the data in the RAM 6 is completed, the recording device 1 is moved to the computer 10 as shown in FIG.
When the switch SW1 is turned on by connecting to the RAM 6, the data to be transferred is stored in the RAM 6 from the computer 10.
Is forwarded to

The switch SW2 is connected to a RAM 6 for measuring data.
The instruction is for instructing the start and stop of the storage in the memory, and is constituted by, for example, a manual operation / manual return type push button switch. When the switch SW2 is turned on, storage of data in the RAM 6 is started, and when the switch SW2 is turned off, the storage operation is stopped.

When the measured data input to the recording device 1 is not an analog signal but digital data output from the radiation thermometer 50 or the like, the data stored in the RAM 6 is obtained by simultaneously turning on the switches SW1 and SW2. It is performed by By such an operation, the control unit 5
Controls the input data to be stored as it is without performing amplification of the input data by the operational amplifiers 3a and 3b and A / D conversion by the A / D converter 4. According to the above configuration, the selection of the recording method based on whether the measurement data input to the recording apparatus 1 is an analog signal or digital data is performed by two switches, SW1 and SW2. However, another switch may be provided and used to make a selection, or the controller 5 may automatically determine the type of the input signal and select the recording method.

The switch SW3 is connected to the C
The reset state of the PU is turned on to set the initial state (the state at power-on) forcibly.

The switch SW4 is used to specify a sampling time interval when performing A / D conversion by the A / D converter 4. In the case of the present embodiment, the switch SW4 is set to 0.
5msec, 1msec, 100msec, 1s, 5s
Any of the sampling time intervals is designated.

The switch SW5 stores the measured data in the RAM6.
This is for designating a time interval (a multiple of the sampling time interval) in which data is written to the memory. In the case of this embodiment, the operation is performed once or ten times the sampling time interval specified by operating the switch SW4. , 60
One of the time intervals of double or 120 times is designated. The control unit 5 determines whether the sampling time interval specified by the operation of the switch SW4 and the switch S
A predetermined process is performed on a plurality of digital data sampled during the storage time interval as shown in the matrix of Table 1 specified by the multiple of the sampling time interval specified by the operation of W5 (the plurality of digital data , Or a process of calculating an average value of the plurality of digital data), and the processed data is written to the RAM 6 at each storage time interval.

[0025]

[Table 1]

The switch SW6 is used to specify the number of input circuits when measuring a multi-circuit as shown in FIG. 8. When a plurality of circuits are specified, a switch corresponding to the number of circuits is used. Only the RAM 6 is divided and stored.

The switch SW7 is switched in accordance with the purpose of measurement to thereby diagnose cable deterioration (leakage current measurement).
Mode or a ring memory storage mode. Here, when the cable deterioration diagnosis mode is designated, the measurement data is sequentially stored from the start address of the storage area, and thereafter, when the storage of the data at the last address is completed, the storage operation automatically ends. On the other hand, when the ring memory storage mode is specified, when the storage of the data at the last address is completed, the head address is specified again, the storage is returned to the head of the storage area, and the storage is continued. When an abnormality is detected, the storage capacity of the RAM 6 is reduced to 1 /
After continuing storage for only 2 minutes, switch SW2 is turned off.
Control is performed by the control unit 5 so that the storage is automatically stopped regardless of the presence or absence of the operation.

Next, connection examples in the case where various measurements are performed using the recording apparatus 1 will be described with reference to FIGS.

To measure the leakage current or the load current, as shown in FIG. 7, a digital clamp 20 is connected to the target equipment, and the digital clamp 20 is connected to the recording device 1.
The connection is made. The digital clamp 20 measures a leakage current, a load current, a voltage, and the like according to a connection point. When the leakage current is measured, the digital clamp 20 is connected to a second-class ground on the secondary side of the transformer of the target equipment. Connected to the wire. If an abnormality is found in the measurement results, the leakage current in a plurality of wirings divided for each of a plurality of switches provided on the load side of the target equipment is measured by a plurality of digital clamps to investigate the cause. At the same time, the wiring which causes the abnormality is found by measuring at 20 and the cause of the insulation deterioration is removed based on the measurement result, thereby preventing the occurrence of the accident.

However, the leakage current often occurs instantaneously in a long period of time as described above, and it is extremely rare that the leakage current is measured at the time of the above-described measurement. It is a very difficult investigation to find the wiring that will be. For this reason, a collective ground fault detector capable of simultaneously detecting up to five signals indicating the presence or absence of leakage current by selecting three types of sensitivities is used in such an investigation. If this detector is used, the generation of leakage current is constantly monitored by the detector installed in the target equipment, and the leakage current that occurs irregularly is detected to find the wiring (circuit) that causes the abnormality. Becomes easier. However,
This detector has the drawback that it can only detect the presence or absence of a leakage current but cannot obtain detailed data indicating its temporal change or the like.

FIG. 8 shows a multi-circuit (maximum 8) measurement of leakage current.
FIG. 3 is a diagram showing a case where measurement is performed simultaneously. By performing such multi-circuit measurement, not only can the above-mentioned drawbacks of the collective ground fault detector be eliminated, but also a plurality of measurement devices that were impossible with a conventional analog recording device. Can be simultaneously stored in one recording device 1.

As shown in FIG. 9, the measurement of cable deterioration is performed by connecting a high rickester 30 and a microampere meter 31 to the target equipment, and further connecting the recording device 1.

As shown in FIG. 10, the constant monitoring of the leakage current is performed by connecting the recording device 1 to an insulation monitoring device 40 installed in the target facility. This insulation monitoring device 40 is connected to an alarm device and issues a warning when an abnormal signal is output from the monitoring device 40, and a transmitter is connected to the insulation monitoring device 40 through a telephone line when an abnormal signal is output from the monitoring device. There is a type in which a receiver installed in an office or the like is automatically notified. In addition to the above-mentioned abnormal signal that is generated when an abnormality occurs in the equipment from any type, an optional output that indicates the insulation status of the lighting system and the power system (motor) of the equipment that is constantly being measured to detect the abnormality is output. Is output.

Further, as shown in FIG.
When digital data measured using a digital measuring device such as 0 is input to the recording device 1, the digital data is input through a terminal 9c of the input terminal 9 dedicated to digital data input.

Next, the operation when a series of security operations (data measurement and storage and subsequent data processing) are performed using the electrical equipment security system of the present invention will be briefly described with reference to FIG.

The data measurement and storage are performed by the switches SW4 to S
This is performed by connecting the recording device 1 in which the control information is set according to the measurement purpose by operating W7 as described above. Switch SW
Recorder outputs or option outputs output from up to eight measurement devices designated by the operation 6 are simultaneously input from the external input control unit 2 to the recording device 1. When the input measurement data is an analog signal, the analog signal is amplified by the operational amplifiers 3a and 3b, and A
After A / D conversion by the / D converter 4, the data is stored in the RAM 6 in the form of digital data. When the input measurement data is digital data, the data is stored in the RAM 6 after the input data is converted into data of a certain form suitable for data processing by the computer 10. Note that these storage processes are performed by the switch SW.
1. Start by turning on SW2.

In particular, when a storage process is performed in which an analog signal is converted into digital data and then stored, the measured data is set in accordance with the sampling time interval and the data writing time interval set in advance by operating the switches SW4 and SW5. Storage suitable for the type of data. That is, the data is stored in the RAM 6 by the control unit 5 so that only the maximum value of the sampling data selected from the storage time intervals of the data specified by the two specified values is stored for each storage time interval. When performing measurements for cable deterioration diagnosis, if the sampling time interval and the writing time interval are shortened and stored, high-precision data that reliably follows the so-called kick phenomenon When the leakage current is measured, the measurable time in one cycle (from the first address to the last address of the storage area) of the storage capacity of the RAM 6 is increased by increasing the data writing time interval. Can be longer. 30Kby
When a memory having a storage capacity of te is used, the maximum measurable time in one cycle when measuring one circuit is 512.
Even when the time becomes 0 hours and the measurement time is long, it is possible to cope with such effective use of the storage capacity of the memory.

When the ring memory storage mode is designated by the operation of the switch SW7, the control unit 5 is controlled to return to the beginning of the storage area and continue the storage when the storage capacity is full. Continuous storage can be performed regardless of the storage capacity of the RAM 6. Further, when an abnormality of the equipment is detected in the course of such continuous storage, the storage of only 1/2 of the storage capacity of the RAM 6 is continued from that point in time, and the storage is performed regardless of whether the switch SW2 is turned off. Is automatically stopped, so that the data at the time of occurrence of the abnormality and the data before and after the occurrence of the abnormality can be reliably stored.

This ring memory storage mode is used for investigating the cause of a frequent power failure, for example, when a high-voltage switch with a ground fault detector arranged on the first pillar of the private power receiving facility operates. It is preferable to specify it when performing measurement for measurement. That is, in order to investigate the cause of the above-mentioned power failure, it is necessary to reliably deal with irregularities that occur irregularly and relatively instantaneously. If the measurement is performed by specifying the memory storage mode, only the data before and after the occurrence of the abnormality necessary for investigating the cause can be reliably stored at high density. Measurement data for judging whether the operation is due to a normal operation caused by the occurrence or an unnecessary operation caused by an external factor can be easily and reliably obtained.

After the above-described measurement and storage are completed, the recording device 1 is connected to the computer 10 via the RS-232C interface 8 and the data stored in the RAM 6 is stored by turning on the switch SW1.
Transfer to 0. Further, if measurement and storage are performed with the computer 10 connected to the recording device 1, it is possible to simultaneously store data in the RAM 6 and transfer data to the computer 10.

Then, the computer 10 performs predetermined data processing for generating information necessary for security of the electrical equipment based on the transferred data. By this data processing, it is possible to automate various equipment diagnosis operations such as diagnosis of the presence or absence of leakage current and quality of cable deterioration, and analysis of data indicating the insulation state of equipment. Further, the obtained data can be stored in another storage medium such as a floppy disk or a hard disk, thereby enabling aging to be tracked.

Next, the operation of the recording apparatus 1 will be described with reference to FIG.
This will be described in detail with reference to FIG.

FIG. 12 is a flowchart showing the flow of the main processing executed by the control unit 5.

The control unit 5 starts the processing of the main routine when the power of the recording apparatus 1 is turned on.
Perform initial setting. In this initialization, the work area of the RAM 6 is initialized, and the start address of the storage area is specified.

Next, the control unit 5 reads the sampling time interval specified by the operation of the switch SW4 in step SP2, and then determines the operation mode in step SP3. The operation mode is determined by the switches SW1 and SW2.
Is performed based on the ON / OFF state of the switch SW1.
If it is determined that only one is in the ON state, step SP
4 to execute the data transfer process, and switch SW2
If it is determined that only one is in the ON state, step SP
5, the storage processing 1 is executed, and the switches SW1, S
When it is determined that both switches of W2 are ON,
The process proceeds to step SP6 to execute the storage process 2. When any of the switches is in the OFF state, no processing is performed, and the switch SW1 or SW2 is turned on.
Maintain the operation waiting state.

FIG. 13 is a flowchart showing the contents of the data transfer process in step SP4 of the main process shown in FIG.

In this process, the control unit 5 first performs a data reproduction output process shown in FIG. 16 in step SP7.
This data reproduction output process is for transferring the data stored in the RAM 6 to the computer 10 via the RS-232C interface 8, and will be described later in detail.

Next, the control unit 5 checks the timer at step SP8 (processing for synchronizing the data reading by the control unit 5 and the data output by the interface 8).
Is performed, it is determined in step SP9 whether all the data stored in the RAM 6 has been reproduced and transferred. here,
If it is determined that all data has been transferred, step S
When the process has proceeded to P10 and the data transfer process has been completed, and it is determined that there is still data to be transferred, step SP
Return to step 7 until all data has been transferred.
The processing of P7 and SP8 is continued.

FIG. 14 is a flowchart showing the contents of the storage processing 1 in step SP5 of the main processing shown in FIG. 12, and shows the processing executed when an analog output signal is input as measurement data. is there.

In this process, the control unit 5 first reads the data storage time interval specified by the operation of the switch SW5 in step SP11, and then reads the data in step SP12.
Is used to determine the presence or absence of an interrupt signal. This interrupt signal is given to the control unit 5 at each sampling time interval specified by the operation of the switch SW4. When the control unit 5 detects the interrupt signal, the process proceeds to step SP13 and the external input control unit After amplifying the analog output signal input from 2 to a predetermined level (for example, 50 times), the signal is converted into digital data.

Next, at step SP14, the converted digital data is written to the RAM 6. The data to be written at this time is only the maximum value of the digital data existing during the storage time interval specified by the operation of the switch SW5. As a method of storing only the maximum value, for example, digital data converted at each sampling time interval is stored in a work area in the RAM 6, and the stored data is compared with the digital data converted at the current sampling time. Then, the work area having the larger value is selected to rewrite the work area, and when the end time of each storage time interval is reached, the data stored in the work area is written to the storage area of the RAM 6. be able to. When data is written to the storage area at the end of the storage time interval, the contents of the work area need to be reset to select the maximum value during the next storage time interval.

Subsequently, in step SP15, step SP
After performing the reproduction output process of the data written in the storage area in FIG. 14 (FIG. 16), it is determined in step SP16 whether or not the storage process 1 is to be terminated, and when it is determined to be terminated (switch SW7) When the cable deterioration diagnosis mode is specified by the operation of
When it is determined that the data has been stored in all of the storage area from the start address to the end address of the storage area of M6,
(Step SP17) only when the control unit 5 determines that the storage of 1/2 of the storage capacity of the RAM 6 has been completed from the time when the control unit 5 detects an abnormality in the electrical equipment). And the storage processing 1 ends. If it is determined that the processing should not be terminated (when the ring memory storage mode is designated, the storage is not terminated even when data is stored in all of the storage areas, and the head address of the storage area is written again. The storage is continued by designating it as an address), and the process returns to step SP12 to continue the storage processing 1. The determination as to whether or not to end the storage can be made using, for example, counter information counted at each storage time interval or designated address information for managing data stored in the RAM 6.

FIG. 15 is a flowchart showing the contents of the storage processing 2 in step SP6 of the main processing shown in FIG. 12, and shows the processing executed when digital data is input as measurement data. .

When storing digital data from a digital measuring device such as the radiation thermometer 50, the switch SW
The storage time interval specified by the operation 5 is specified by a multiple of the data output time interval in the radiation thermometer 50,
In the storage process 2, first, the storage time interval is read in step SP18.

The digital data output from the radiation thermometer 50 includes unnecessary data (for example, data for confirming that the radiation thermometer 50 is for low temperature) in addition to the measured temperature data. Since it is included, the control unit 5 separates the digital data into measured temperature data and other unnecessary data in step SP19, and further separates the separated temperature data into 8-bit data (this is the step shown in FIG. 14). By converting the data into the same format as the digital data written in SP14), the writing of the data to the RAM 6 in step SP20 is controlled so that only the temperature data can be written. The fact that the data to be written is only the maximum value of the digital data included in the storage time interval is the same as in the data writing shown in step SP14 of FIG.

Subsequently, after performing the reproduction output process (FIG. 16) of the data written in the RAM 6 in step SP20 in step SP21, the control unit 5 executes step SP21.
At 22, a timer check is performed. And step SP2
In 3, it is determined whether or not to terminate the storage process 2 (similar to the determination shown in step SP <b> 14 of FIG. 14). Alternatively, the process returns to step SP19 to continue the storage process 2.

FIG. 16 is a flowchart showing the contents of the reproduction output processing shown in FIGS.

This reproduction output process is a process commonly performed in the data transfer process of FIG. 13 and the storage processes 1 and 2 of FIGS. 14 and 15, and the designation of the address of the storage area of the RAM 6 is included in this process. When performing the storage process, the data write address and the read address are specified at the same time, and if the measurement storage is performed with the computer 10 connected to the recording device 1, the data storage And data transfer to the computer 10 can be performed simultaneously.

The control unit 5 reads out the data stored at the address currently specified in step SP25 and blinks LED1 or LED2 in step SP26 to confirm that data transfer processing or storage processing is being performed. indicate. After that, the process shifts to step SP27 to transfer the data read in step SP25 to the computer 10 via the interface 8.

Subsequently, in step SP28, the next address is designated by incrementing the address number, an overflow check of the storage capacity is performed, and the reproduction output processing ends.

Thus, the measurement data output from the various measuring devices is temporarily stored in the form of digital data in the memory, and thereafter, data processing is performed based on the stored data. By making it possible to perform the operation in the mode, it is possible to improve the efficiency of the security work of the electrical equipment as a whole.

The recording apparatus 1 itself may be provided with the above-described data processing function, display and printout function performed by the computer 10. If the memory for taking the measurement data is a card-type memory that is detachable from the recording device 1, only the card-type memory storing the measurement data can be brought back from the measurement site, which is convenient. Is large, and a large amount of data can be stored. Furthermore, if the storage device 1 is connected to a computer in a business office or the like via a telephone line via a modem, it is possible to perform security work for electrical equipment more quickly and with higher working efficiency.

[0063]

As described above, according to the portable digital recording apparatus and the security system for electrical equipment of the present invention, when the storage capacity of the data storage means is full, the storage area returns to the beginning of the storage area to continue the storage. Since the control is performed by the control means as described above, continuous storage can be performed regardless of the storage capacity of the data storage means. Further, when predetermined information is detected during such continuous storage, the storage operation is stopped for a predetermined period from that point in time, and then the storage operation is stopped. And it can be memorized reliably. According to another feature of the present invention, storage suitable for the type of measurement data can be performed according to a preset data sampling time interval and data storage time interval. That is, the data storage in the data storage means is controlled so that only the maximum value of the sampling data selected from the set storage time interval is stored for each storage time interval. When performing measurements for diagnosis, if the sampling time interval and the storage time interval are shortened and stored, high-precision data that reliably follows the so-called kick phenomenon can be obtained. When performing the measurement, the measurable time in one cycle of the storage capacity of the data storage means can be increased by increasing the data storage time interval. From the above, according to the present invention, output information from various measuring devices can be easily and reliably recorded, and information necessary for diagnosing electric equipment can be easily obtained from the recorded information quickly and accurately. Can perform security work on electrical equipment.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a security system for electrical equipment to which the present invention has been applied.

FIG. 2 is a graph in which measurement data obtained from the recording device 1 is arranged by a computer 10 and the occurrence rate for each level of data is expressed in%.

FIG. 3 is a diagram in which the computer 10 arranges measurement data obtained from the recording apparatus 1 and outputs an occurrence rate for each level of data in a frequency distribution.

FIG. 4 is a diagram in which the measurement data is subjected to 1/60 time axis compression processing, and all the measurement data is displayed and output.

FIG. 5 is a diagram in which a 1/10 time axis compression process is performed on the measurement data to display and output a part of the measurement data.

FIG. 6 is a diagram showing an appearance of the recording apparatus 1.

FIG. 7 is a diagram illustrating a connection example in a case where a leakage current or a load current is measured using the recording device 1.

FIG. 8 is a diagram showing a connection example in the case where the measurement of the leakage current or the load current is performed by multiple circuits.

FIG. 9 is a diagram illustrating a connection example in a case where measurement for cable deterioration diagnosis is performed using the recording device 1.

FIG. 10 is a diagram illustrating a connection example in a case where the insulation state of equipment is measured using the recording device 1.

FIG. 11 is a diagram showing a connection example in the case of measuring a radiation temperature using the recording device 1.

FIG. 12 is a flowchart showing a flow of a main process executed by the control unit 5;

FIG. 13 is a step SP4 of the main process shown in FIG. 12;
9 is a flowchart showing the contents of the data transfer process.

FIG. 14 is a step SP5 of the main processing shown in FIG. 12;
5 is a flowchart showing the contents of a storage process 1 of FIG.

FIG. 15 is a step SP6 of the main processing shown in FIG. 12;
9 is a flowchart showing the contents of a storage process 2 of FIG.

FIG. 16 is a flowchart showing the contents of the reproduction output processing shown in FIGS. 13 to 15;

[Explanation of symbols]

 Reference Signs List 1 portable digital recording device 2 external input control unit 3a, 3b operational amplifier 4 A / D converter 5 control unit 6 RAM 7 ROM 8 RS-232C interface 9a, 9b, 9c external input terminal 10 personal computer (52NOTE) 20 digital clamp Meter 30 high rickester 31 microampere meter 40 insulation monitoring device 50 radiation thermometer

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) G08B 29/12 G01D 9/00 G06F 17/40

Claims (4)

(57) [Claims] 1. A recording device connected to a measuring device for measuring a voltage or a current value necessary for security of electrical equipment, wherein the input device receives an analog output signal or digital data output from the measuring device. Means, amplifying means for amplifying an analog output signal of the measuring device input via the input means, and an A / D converter for converting the analog output signal amplified by the amplifying means into digital data. data storing means for storing digital data outputted from the digital data or the a / D converter is input via the input means, towards the end region from the head area of the data storage means
Digital data is stored and stored in the final area.
By restarting storage from the top area again when completed
Continue the storage operation, and in the process of the continuous storage,
When you get
Control means for controlling the storage operation to be stopped after the recording. Wherein upper and setting means for setting a storage time interval data into the A / D sampling time interval of data in the converter and the data storing means, in the storage time in interval set by the setting means
Digital data input through the input means or
In the digital data output from the A / D converter
And select the maximum value and store it in the data storage means.
2. The portable digital recording apparatus according to claim 1 , further comprising a second control unit for controlling the digital recording. 3. A voltage or current value required for securing electrical equipment.
A recording device connected to a measuring device that measures
Te, the analog output signal or di outputted from the measuring device
Input means for inputting digital data, and an analog of the measurement device input via the input means.
Amplifying means for amplifying the analog output signal, and the analog output signal amplified by the amplifying means.
An A / D converter for converting to digital data, and digital data or digital data input through the input means.
Record the digital data output from the A / D converter.
Between the data storage means to be stored and the data sampling time in the A / D converter.
And the time interval for storing data in the data storage means.
Setting means for setting, and an upper limit during the storage time interval set by the setting means.
Digital data input through the input means or
A plurality of digital data output from the A / D converter
Select the maximum value from the above and store it in the data storage means.
Control means for controlling so that
Portable digital recording device. 4. The portable digital recording device according to claim 1, further comprising communication means for transferring digital data stored in said data storage means to a data processing device. A data processing device that fetches digital data stored in the data storage means and performs data processing for generating information necessary for securing electrical equipment; and displaying or printing out a data processing result by the data processing device. A safety system for electrical equipment, comprising: