JP3141986B2 - Remote monitoring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote monitoring device at a data collection site such as a governor of a city gas supply system.

[0002]

2. Description of the Related Art The current patrol inspection work in a governor for supplying city gas involves leak inspection every seven days based on security regulations.
It is implemented for the purpose of collecting pressure recording paper and the like, and therefore, a recorder for recording the primary pressure, the secondary pressure, and the governor opening is installed in the governor chamber containing the governor. The recorder records the measurement data on a recording paper. The recorded data is collected, brought back, and processed collectively by a host computer or the like. Some recorders have a relative measurement method.
In such a recorder, setting is made in advance so that the measured value is equal to the actual value.

[0003] In addition, there has been an attempt to remotely monitor governors installed at a large number of locations using a common center monitoring device.
For example, as an attempt, a data collection device equipped with communication means with the center monitoring device is installed in each governor, and monitoring measurement data collected by the data collection device and temporarily recorded on a recording medium is monitored by the center monitoring device. There is a method in which a call is periodically transmitted from the device to a center monitoring device through a communication line, and the center monitoring device collects data to record and determine an abnormality or the like.

[0004] As an example of a recorder or measuring instrument of the relative measurement type, there is an optical governor opening meter. This travel meter is
An optical grating is formed on a scale plate that responds to the governor valve body, and the displacement of this optical grating is read and counted optically by transmitted light or reflected light to measure the amount of movement of the scale plate incrementally. This is a configuration in which the position of the valve element, that is, the opening is measured in a relative manner.In such a configuration, the absolute position of the scale plate cannot be measured. The measurement output is set as a reference for the zero point, and the correspondence with the valve opening is performed.

[0005]

In the former method, the governor cannot be monitored in real time, the processing after data collection is very troublesome, and the above inspection is indispensable.

In the latter method, the amount of data collected by the center monitoring device becomes enormous, and the amount of arithmetic processing such as abnormality determination becomes enormous.
Human resources, that is, system resources, are enormous and impractical. In the latter method, data recorded on a recording medium is cleared after communication with a center monitoring device within a predetermined time, and actual data is not stored on the recording medium.

[0007] In either of the former and the latter, when the standard of a recorder or a measuring device of the relative measurement method is lost due to a power failure or the like, the measurement becomes impossible or the measured value becomes an appropriate value. In addition, there is no function for manually restoring the measured value to an actual value by returning the measurement value to a value that enables measurement. Accordingly, an object of the present invention is to solve such a problem.

[0008]

In order to solve the above-mentioned problems, the present invention provides an on-site processing device installed at a data collection site and a common center monitoring device connected to a number of on-site processing devices via a communication line. The on-site processing device includes a main body processing unit including a data collecting unit from a monitoring measuring device, a data recording unit on a nonvolatile recording medium, and a data abnormality monitoring unit, and a center monitoring unit. The main processing unit constitutes a communication processing unit with the device, and the main processing unit has a function of recording past performance data on a non-volatile recording medium together with sequential data, and also measures a measurement value of a relative measurement type measuring device. The present invention proposes a remote monitoring device having a function of correcting a past result data to a constant value in a time zone in which a constant value continues for a predetermined time or more.

According to the present invention, in the above configuration,
The operation of correcting the measurement value of the measurement device to a constant value in the past performance data is performed after the correction command is issued from the main processing unit itself of the field processing device or the center monitoring device, and the measurement value continues for a certain time or more. It is assumed that the measurement is performed during a time period when the power becomes a constant value, the measurement is continued from the time of the power failure to the completion of the correction, and it is proposed that the measurement data be corrected in accordance with the correction operation.

The above-mentioned correction command is generated by the center monitoring device or the main processing unit itself after the restoration of the power failure, or issued by the main processing unit when the deviation of the measured value from the actual data is increased by a predetermined width or more. Suggest to do.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 schematically shows the entire structure of the present invention. Reference numerals 1 (1a, 1b,..., 1n) denote governor chambers installed in a city gas supply system. 2 together with a measuring instrument group for monitoring the governor body 2 such as an opening meter of the governor body 2, a primary side sensor, a secondary side pressure sensor, a flow meter, and a gas detector, a governor cut-off detection sensor, and an SI sensor abnormality detection. Various monitoring devices (not shown) such as an abnormality detection device group such as a sensor are installed, and the data collection site for governor monitoring is provided. An on-site processing device 3 for collecting and processing data from these various devices is installed outside the governor room 1.

Reference numeral 4 denotes a common center monitoring device for monitoring the operation and the like of the governor body 2 at a plurality of locations. The center monitoring device 4 and the on-site processing device 3 at each data collection site are connected via a communication line 5. Connected to form a remote monitoring device. The communication line 5 applies a public line, a dedicated line, and a wireless line alone or in combination. The center monitoring device 4 and each on-site processing device 3 constitute communication means corresponding to these communication lines. Note that a plurality of center monitoring devices 4 may be provided.

FIG. 2 is a schematic block diagram showing an example of the configuration of the on-site processing device 3 constituted by a microcomputer application device or the like. The on-site processing device 3 includes a monitoring data collecting means A and a non-volatile recording medium. Data recording means B to
And a data processing unit M comprising data abnormality monitoring means C
And a communication processing unit S with the center monitoring device 4,
They constitute the CPUs 6m and 6s, respectively.

Reference numeral 7a connected to the on-site processing unit 3 indicates a measuring instrument group such as an opening meter of the governor main body 2, pressure sensors on the primary and secondary sides of the governor main body 2, a flow meter, and a gas detector. , Are configured to output measurement data in analog quantities. For example, the opening meter is of a relative measurement type as described above. Reference numeral 7b denotes a group of abnormality detection devices such as a governor cutoff detection sensor and an SI sensor abnormality detection sensor, which are contact outputs.

The on-site processing apparatus 3 includes the above-described measuring equipment group 7a
And input means 8a and 8b for connecting the abnormality detection device group 7b to the input device 8b. That is, reference numeral 8a is a measurement data input means, which comprises an analog pre-processing circuit, an A / D converter, a level converter, etc., and has a function of converting analog data of each measuring device into a predetermined digital signal. It is configured to have. Reference numeral 8b denotes an abnormality detection data input means, which comprises a level conversion circuit and the like.

The data which is converted into a predetermined digital signal by each of the data input means 8a and 8b is temporarily read by a data reading means 9 into an appropriate storage area of the main processing unit M for performing subsequent processing. And For example, the data reading means 9 has a function of controlling each of the data input means 8a and 8b and intermittently transferring data to a predetermined temporary recording area such as a RAM every time, for example, every 0.5 second sampling time. The monitoring data collection means A is constituted by these configurations.

The monitoring data collecting means A has a correction function for making the output value correspond to the actual value in correspondence with the measuring device 7a of the above-mentioned relative measuring method. The correction function is a function for making the measured values collected from the measuring device 7a via the data input means 8a and the data reading means 9 correspond to the actual values. For example, this function is used when the actual value is zero. Set as zero point of
When the actual value is a known constant value, it is realized by an operation of setting a reference so that the value is used as a measured value, but the specific method is to use the above-described incremental displacement measurement mechanism or the like. It is possible to use a conventional method of operation for correcting a measured value in a relative-measurement-type measuring device used.

In the above configuration, the data of the measuring instrument group 7a read into the data reading means 9 is not changed from raw data.
Alternatively, after performing appropriate arithmetic processing or the like, the data is recorded over time on the non-volatile recording medium 11 such as an IC memory card via the recording medium read / write means 10 at predetermined time intervals, and the actual data for the period up to that time is recorded. For example, it is configured to record a statistic of each measurement target item at each time, for example, data such as an average value and a standard deviation, and the recording medium read / write means 10 constitutes the data recording means B.

The data recording capacity of the non-volatile recording medium 11 is, for example, one year of the above-mentioned data. When the recording time is exceeded, the oldest data is sequentially erased when recording new data. Always
For a predetermined period from now, that is, in this case, data for the latest one year can be held. The data recording interval on the non-volatile recording medium 11 is determined in consideration of the capacity of the non-volatile recording medium 11 and the continuous recording period of data. For example, in the case of the above example, it is longer than the sampling time. Time, for example, every minute. Note that the recording interval can be different for each measurement target item.

FIG. 4 shows an example of actual data recorded on the non-volatile recording medium 11. The solid line indicates the opening measured by an optical governor opening meter which is a relative measuring type measuring device for one day. It is shown as an average value at each time of 24 hours. According to this performance data, T _{1 in the} early morning
Opening becomes zero, the opening degree for a period of daytime T ₂ has a constant value A in the period.

In the main processing unit M, among the data intermittently read by the data reading means 9, the data of the measuring equipment group 7a is set by the data processing means 12 to the set values such as the upper and lower limits and the deviation as the actual data. , And other processing, such as determining an abnormality and generating a warning as a result.

For example, the primary and secondary pressures of the governor body 2 from the measuring instrument group 7a, the opening degree of the governor body 2, the flow rate,
Data such as gas concentration is read by the data reading means 9 at every sampling time of 0.5 seconds, for example, as described above, and is recorded in the non-volatile recording medium 11 and the upper and lower set values preset in the data processing means 12. The abnormality is monitored by comparing with the deviation as the actual data. In addition, if necessary, a predetermined calculation such as a calculation of a data difference between adjacent sampling times, a pressure correction of a flow rate, or a time-based weighted averaging process of the data is performed. Is compared.

As a result of the above processing, when it is determined that the data is abnormal, the data processing means 12 issues an alarm output to the abnormality processing means 13 and, at the same time, stores the corresponding data as the elapsed data together with the data before and after the data. To record. The progress data storage unit 14 is constituted by a nonvolatile storage unit such as an SRAM backed up by a battery. These data processing means 12, abnormality processing means 13 and progress data storage means 14
Is composed.

The abnormality processing means 13 monitors an alarm from the data processing means 12 and an abnormality detection output from the abnormality detection equipment group 7b obtained via the data reading means 9, and monitors the equipment group 7a,
In addition to the processing for the data abnormality of 7b, the processing for the equipment abnormality of the on-site processing device 3 itself such as the operation error of the data reading means 9 is performed. That is, the abnormality processing means 1
3 indicates the importance of the abnormality when the data processing unit 12 issues an alarm, when the abnormality detection device group 7b issues an abnormality detection output, or when an operation error signal of the data reading unit 9 or the like is issued. It performs classification processing, processing corresponding to the degree of importance of abnormality, and abnormality handling processing such as output to the communication processing unit S.

For example, when the data processing unit 12 issues an alarm, the abnormality processing unit 13 determines whether the abnormality is a process-related abnormality based on the content of the abnormality data.
Is determined to be abnormal. At this time, the abnormality processing unit 13 accesses the non-volatile recording medium 11 via the recording medium read / write unit 10 as necessary, depending on the content of the abnormality, and stores the abnormal data in the past recorded in the non-volatile recording medium 11. The abnormality can be determined by comparing the data with similar data. In addition, in the determination operation of such an abnormality, in addition to the abnormality data itself, the elapsed data temporarily recorded in the elapsed data storage unit 14 can be used.

In this way, the main body processing section M determines the abnormality in the abnormality processing means 13 as described above, and determines the content of the abnormality, for example, the most important, important, less urgent, and less urgent. Classification processing is performed into four levels of importance and the like, and a report request to the center monitoring device 4 is output to the communication processing unit S according to the contents.

The communication processing unit M comprises a communication management means 15, a communication control means 16 managed by the communication management means 15, and a transmission / reception means 17 controlled by the communication control means 16. That is, 16a is a dedicated / wireless line communication control means, 16b is a public line communication control means, 16c is a serial communication communication control means, and the communication control means 16a is a wireless communication via the dedicated / wireless line communication modem 17a. Connected to the communication device 22, the communication device control means 18, the control output means 1
9, the communication control unit 16b controls the activation of the wireless communication device 22, and the communication control unit 16b controls the public communication modem 17b.
Is connected to the public line 20 via the public telephone line. With the above configuration, the communication management unit 15 can perform communication using either the dedicated / wireless line 21 or the public line 20 as the communication line 5 with the center monitoring device 4. On the other hand, the communication control means 16c is a modemless serial interface 17c.
The transmission / reception means 16c is connected to a portable terminal device 23 and other modems.

In the above configuration, as described above, when the main body processing unit M outputs a report request to the center monitoring device 4 to the communication processing unit S, the communication management unit 15 The notification processing to the center monitoring device 4 is performed with the priority set in advance according to the importance thus set.

FIG. 3 is a block diagram showing the basic configuration of the center monitoring device. The center monitoring device 4 includes a communication processing unit D for communicating with a communication processing unit S of the on-site processing device 3, a monitoring unit 24, and a display unit. Means 25, alarm means 26, operation input means 27 and the like. The communication processing unit D includes, similarly to the on-site processing device 3, a dedicated / wireless communication control unit 29a corresponding to the wireless device 28, a dedicated / wireless communication modem 30a, and a dedicated / wireless communication modem 30a corresponding to the public line 20. Line communication control means 29b, public communication modem 30
b.

In the above configuration, the center monitoring device 4 displays on the display means 25 the data of the content of the abnormality transmitted from the communication processing section D of the on-site processing device 3 via the communication line 5 and, if necessary, An alarm is generated by the alarm means 26. As described above, the center monitoring device 4 can detect the occurrence of the abnormality and its content without processing the raw data of the equipment at the data collection site, and can take prompt action.

The center monitoring device 4 collects and analyzes raw data of the equipment at each data collection site, that is, data of the non-volatile recording medium 11 and the temporary storage means 14 of the elapsed data as needed. You can also.

In the above remote monitoring operation, when the power supply is temporarily stopped due to the power failure of a certain on-site processing device 3, the relative measurement type measuring device 7a is used to make the measured value correspond to the actual value. Since the reference is lost, the measurement becomes impossible even if the power supply is restored, or the measured value becomes an appropriate value. For example, assuming that the solid line in FIG. 4 is the actual angle of the governor, the measured value shifts to a direction larger than the actual angle as shown by the one-dot chain line in the figure, It shifts to a small direction, so that accurate measurement of the opening cannot be performed.

Therefore, in the remote monitoring apparatus of the present invention, the function of correcting the measured value according to the past actual data is operated for the on-site processing apparatus 3 in which the power supply is temporarily stopped.
The operation of the correction function is configured to be automatically performed after power supply is restored by a power failure monitoring function configured in the main body processing unit M of the on-site processing device 3 and to be operated by a command from the center monitoring device 3. be able to.

The main processing unit M responds to the correction command by itself or the correction command from the center monitoring device 3 to record the measured value in a time zone in which the measured value continues to be an arbitrary constant value for a predetermined time or more. An operation of correcting the data to a constant value is performed. Since the fixed value to be corrected is actual data, that is, a statistical value, an error corresponding to a deviation from an actual value can be considered.

[0035] To describe an example of a corrective action for an example of a corrective action for the FIG. 4, for example when receiving the correction instruction from the center monitoring device 3 at time t ₁ after power is restored, the main body processing portion M is determined Until the time when the value continues for a certain time and becomes constant, data collection continues in the state after the power failure, and when the measured value becomes constant,
Central segments T ₁ of the measured values during a certain period of time T _1, T ₂ ',
At an appropriate time point of T ₂ ′, a correction operation is performed to make the measured value at that time point correspond to a fixed value that is the actual data. That is, when the correction is performed in the section T ₁ ′, the correspondence is set so that the measured value at that time is set to zero, and when the correction is performed in the section T ₂ ′, the measured value is set to A. Set the relationship.

By performing the correction operation in this manner, even if the measuring device of the relative measurement method loses the standard due to a power failure, the standard can be set again based on the actual data within one day and the measurement can be continued. However, as described above, this criterion prevents the measurement from being impossible at all, or having an appropriate value and being substantially impossible to measure, even though the actual value includes an error of a deviation from the actual value. Therefore, it is possible to ensure the remote monitoring of the device.

The measured values of the relative measurement type measuring instruments collected during the period from the restoration of the power failure to the time when the correcting operation is performed are obtained by applying the deviation of the measured value in the correcting operation to the data during this period. Can be corrected by
Therefore, data collection can be performed without interruption, excluding the power outage period.

The above-mentioned correcting operation can be performed not only after the restoration of the power failure but also when the measured data gradually deviates from the actual data, and the main processing unit itself issues a correction command when the deviation is expanded by a predetermined width or more. it can.

[0039]

As described above, according to the present invention, each on-site processing device determines an abnormality of monitored data and transmits predetermined data to the center monitoring device via the communication processing unit. The effect is as follows. Eliminating the collection operation every short period as in the on-site recording paper system is unnecessary. The data can be processed directly by computer without performing the necessary input work in the case of the on-site recording paper system. The processing load on the center monitoring device is small, and neither the hardware nor the software is enormous. Since the operation in the center monitoring device is simple, a skilled person is not required. By recording performance data on a portable non-volatile recording medium and using it as data for judging abnormality of measured data, abnormality of a sensor such as a measuring device can be detected. When the measuring instrument of the relative measurement method loses the standard at all due to a power outage or the deviation has expanded by more than a predetermined value, the standard can be set again based on the actual data within one day and the measurement can be continued, and this standard is described above. As described above, even if the actual value includes an error corresponding to the deviation, it is possible to prevent the measurement from being impossible at all, or from being an appropriate value and substantially impossible from being measured. Remote monitoring can be assured. The measured values of the relative measurement type measuring device collected during the period from the restoration of the power failure to the time when the correcting operation is performed are corrected by applying the deviation of the measured value in the correcting operation to the data during this period. Therefore, data collection can be performed without interruption, except for a power outage period. It is possible to omit the task of managing the measurement failure or the error of the measured value due to the power outage, and the task of a person going around each on-site processing apparatus and performing the correcting operation of the measuring device of the relative measurement method.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically showing an overall configuration of the present invention.

FIG. 2 is a block diagram illustrating an example of a basic configuration of a field processing apparatus according to the present invention.

FIG. 3 is a block diagram showing an example of a basic configuration of a center monitoring device according to the present invention.

FIG. 4 is an explanatory diagram showing a correction operation according to the present invention.

[Explanation of symbols]

A monitoring data collecting means B data recording means C abnormality monitoring means M main body processing section S communication processing section D communication processing section 1 (1a, 1b, ..., 1n) governor room 2 governor main body 3 field processing device 4 center monitoring device 5 Communication line 6m, 6s CPU 7a Measuring equipment group 7b Abnormality detecting equipment group 8a Measurement data input means 8b Abnormality detection data input means 9 Data reading means 10 Recording medium reading / writing means 11 Non-volatile recording medium 12 Data processing means 13 Abnormal processing means 14 Progress Data storage means 15 Communication management means 16a, 29a Dedicated / wireless line communication control means 16b, 29b Public line communication control means 16c Serial communication communication control means 17a, 30a Dedicated / wireless line communication modem 17b, 30b Public communication modem 17c Modemless serial interface 18 Communication device control means 9 the control output unit 20 public line 21 only, wireless communication line 22 wireless communication device 23 accepted 搬端 end device 24 monitoring means 25 display means 26 alarm means 27 operational input means 29 wireless device

Claims (6)

(57) [Claims] An on-site processing device is installed at a data collection site, and a common center monitoring device is connected to a number of on-site processing devices via a communication line. A data processing unit for collecting data from the device, a data recording unit for storing data in a non-volatile recording medium, and a data abnormality monitoring unit; and a communication processing unit for communicating with the center monitoring device. In addition to the function of recording past performance data on a non-volatile recording medium along with the data of
A remote monitoring device characterized by comprising a function of correcting the measured value to a constant value in the past performance data in a time zone in which the measured value continues to be an arbitrary constant value for a predetermined time or more. 2. The operation of correcting a measured value of a measuring device to a constant value in past performance data is performed in a time zone where the measured value continues to be a constant value for a fixed time or more after a correction command is issued. 2. The remote monitoring apparatus according to claim 1, wherein the measurement is continued from the correction command to the completion of the correction, and the measurement data is corrected in accordance with the correction operation. 3. The remote monitoring device according to claim 1, wherein the correction command is issued from a center monitoring device. 4. The remote monitoring device according to claim 1, wherein the correction command is issued by the main processing unit itself of the on-site processing device. 5. The remote monitoring device according to claim 3, wherein the correction command is issued after restoration of the power failure. 6. The remote monitoring device according to claim 4, wherein the correction command is issued when a deviation of the measured value from the actual data is increased by a predetermined width or more.