JP2001202583A - Remote monitoring system for gas supply pressure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of call times and to shorten communication time until a center side obtains required pressure data which becomes the history of pressure fluctuation before the occurrence of abnormality after pressure abnormality occurs, to eliminate the need of a trouble until the center-side obtains pressure data and to simultaneously and easily process plural pressure abnormalities. SOLUTION: The inlet pressure and the outlet pressure of a governor 2 are converted into electric signals by pressure sensors 3 and 4 and are inputted to a digital self-registering pressure gage. The signals are sampled, are A/D- converted and are stored in a memory. When pressure abnormality occurs, pressure data including the history of pressure fluctuation for prescribed time is added to alarm information and it is sent to a center device 7 by a telephone line 9 from a communication unit 6 through a base station 10. A personal computer 8 graphs the time lapse of pressure data and displays it with the content of alarm information and a governor name and assists the judgment of a worker.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote monitoring system for reporting an abnormal gas supply pressure to a center.

[0002]

2. Description of the Related Art In a gas supply business, a governor for reducing and maintaining a constant gas pressure is provided at a base of a high / medium pressure conduit which is a main line for supplying gas, and a governor chamber is provided with a primary side of the governor. A digital self-pressure gauge that converts the pressure on the secondary side into an electric signal and records it is provided.

When a pressure abnormality exceeding or falling below the threshold occurs, a function of notifying the center as an alarm signal is provided. The message format of the alarm call information at this time is shown in FIG.

[0004]

The data of the electronic message shown in FIG. 5 sent from the digital self-pressure gauge to the center when a pressure abnormality occurs is only alarm information indicating an alarm event. On the side, a display such as that shown in FIG. 6 is displayed on the center device, and it is determined only by the contents of the message shown in FIG. 5 whether the alarm needs an urgent dispatch or whether monitoring should be continued by watching the situation. I can't.

Therefore, it is necessary to make a judgment by looking at the history of the pressure change from several hours to about one day before the occurrence of the abnormal pressure.

In order to check the history of this pressure change, the center side requests the digital self-manometer again for pressure data, and receives the pressure data in a message format as shown in FIG.

However, after the telegram of the alarm information shown in FIG. 5 is received by the center side, the telephone line is disconnected by transmitting the end telegram from the center device, so that the past history of the pressure change is viewed. For this reason, it is necessary to make a telephone call again to request the corresponding pressure data again, and there is a problem that a time delay occurs when a quick response is required.

Another problem is that the number of calls increases and the communication cost increases.

Further, after the message of FIG. 5 is received at the center, the line is temporarily disconnected, and thereafter, the message of FIG. 7 is requested and received again. Therefore, as shown in FIG. Must be sent and received.

Normally, the terminal call reception and the center polling device are separate. Therefore, after confirming the alarm by the terminal call reception device, the center polling device selects the governor concerned and requests the pressure data. However, it takes a long time to obtain the pressure data from the viewpoint of the above, and there is a problem that a quick response cannot be performed.

Accordingly, an object of the present invention is to provide a gas supply pressure remote monitoring system which can solve these problems.

[0012]

In order to achieve the above object, a remote monitoring system for gas supply pressure according to claim 1 is provided.
In a remote monitoring system for gas supply pressure using a digital self-management pressure gauge and a communication unit, alarm information is called out by communication when a pressure error occurs, and the pressure data before the error occurrence is attached to the alarm information and transmitted. It is characterized by having made it.

According to a second aspect of the present invention, there is provided a remote gas supply pressure monitoring system having a digital self-recording pressure gauge, a communication unit, and a center device connected to the communication unit via a telephone line. When the center device receives the alarm information called by communication at the time of occurrence, the center device judges the content of the alarm information, and if it needs the pressure data before the occurrence of pressure abnormality etc. from the In this case, the telegram of the pressure data request is automatically and continuously transmitted without performing the above operation.

[0014] Upon receiving the telegram of the pressure data request from the center device side, the digital type self-recording pressure gauge side continues the pressure data within a predetermined time of several hours to one day from the time of occurrence of the pressure abnormality to the center device. To send.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments of the present invention will be described with reference to the drawings.

[Embodiment 1] In FIG. 1 (a), the inlet side pressure and the outlet side pressure of a governor 2 installed in a governor chamber 1 are converted into electric signals by pressure sensors 3 and 4, respectively. The data is input to the total 5, sampled at predetermined intervals, further A / D converted, and stored in the memory of the CPU. Reference numeral 5a denotes a battery box of the digital self-managing pressure gauge 5, which contains a battery and a current limiting resistor connected in series to the battery and supplies power to the digital self-managing pressure gauge.

The pressure data stored in the digital self-recording pressure gauge is transmitted to the PHS communication unit 6 at regular intervals and stored. Reference numeral 6a denotes a battery box containing a battery for supplying operating power to the communication unit 6, and a current limiting resistor for explosion protection is connected in series to the battery.

If a pressure abnormality occurs for some reason, the communication unit 6 wirelessly transmits the alarm information and the pressure data within several hours to one day from the time of occurrence of the pressure abnormality in the form of a message shown in FIG. To the center device 7 via the.

FIG. 2 shows a communication procedure at this time. First, a terminal call initiation message is transmitted from the digital self-managing pressure gauge side, and the center device receiving this transmits a call information request message. Upon receiving this, the digital self-recording pressure gauge side attached pressure data for a predetermined period to the alarm information.
A message in the form of (b) is transmitted. The center that has received this message transmits an end message and the communication ends. In total, only four transmissions and receptions are required.

Since the telegram of FIG. 1B includes pressure data for several hours before the occurrence of the abnormality, the center device 7 receiving the pressure data converts the pressure data into a graph on the personal computer 8. The change history is displayed as shown in FIG.

By looking at this display, it is possible to easily estimate the cause of the abnormality and determine whether or not emergency dispatch is necessary.

In FIG. 1A, 9 is a general telephone line,
Reference numeral 10 denotes a base station, and the base station 10 is connected to the center device 7 via a general telephone line 9.

[Embodiment 2] The hardware configuration of the system of this embodiment is similar to that of FIG.

If a pressure abnormality occurs for some reason, the communication unit 6 transmits alarm information to the center device 7 via the telephone line 9 in the form of a message shown in FIG.

FIG. 4 shows a communication procedure at this time. First, a terminal call activation message is transmitted from the digital self-managing pressure gauge 5 side, and the center device 7 receiving this transmits a call information request message. Digital self-recording pressure gauge 5 receiving this
The side transmits the alarm information in the form of a message shown in FIG. The center device 7 receiving this determines from the content of the alarm information whether the pressure data before the occurrence of a pressure abnormality or the like is necessary or unnecessary. If the pressure data is required, it is automatically set without disconnecting the line. Then, transmit a pressure data request message. On receiving the digital data, the digital self-managing pressure gauge 5 receives the pressure data for a predetermined time from several hours to one day before the occurrence of the abnormality as a pressure data response message as shown in FIG.
Send to

The center device that has received the pressure data message displays the history of the pressure fluctuation as a graph as shown in FIG.

When the center device 7 determines that there is no need to request pressure data at the time of receiving the alarm information in FIG. 5 from the digital type self-managing pressure gauge 5, the center device 7 sends an end message to end the communication.

Therefore, when it is not necessary to request the pressure data, the line is disconnected as in the conventional case, and the time for using the line is short.

[0029]

Since the gas supply pressure remote monitoring system of the present invention is configured as described above, the number of times of transmission and reception of the communication procedure from the occurrence of an abnormality to the reception of pressure change history data is reduced as compared with the conventional system. In addition, there is no waste in that the line is disconnected on the way and the call is made again. Therefore, the communication cost can be reduced by reducing the number of calls and the call time, and quick response can be made when an abnormality occurs.

Further, since necessary pressure data can be automatically obtained at the center side, the supervisor can easily judge based on the information. Therefore, the processing time for communication for each occurrence of an abnormality is shortened, and it is possible to efficiently deal with the occurrence of alarms from a plurality of locations.

[Brief description of the drawings]

FIG. 1A is a block diagram of a system, and FIG. 1B is a diagram showing a message format according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a communication procedure according to the first embodiment of the present invention.

FIG. 3 is a diagram illustrating an example of a display screen of a personal computer on the center device side according to the embodiment of the present invention.

FIG. 4 is a diagram showing a communication procedure according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a message format according to the related art.

FIG. 6 is a diagram showing an example of a display screen of a personal computer of a center device according to the related art.

FIG. 7 is a diagram showing a message format according to the related art.

FIG. 8 is a diagram showing a communication procedure according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Governor room 2 Governor 3, 4 Pressure sensor 5 Digital self-recording pressure gauge 5a Battery box 6 PHS communication unit 6a Battery box 7 Center device 8 Personal computer 9 General telephone line 10 Base station

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tsuyoshi Kanamaru 19-18 Sakuradacho, Atsuta-ku, Nagoya Toho Gas Co., Ltd. Aichi Clock & Electric Co., Ltd. BB12 BB32 BB74 DD33 EE03 EE20 FF01 FF04 FF23 GG66 GG70 GG79 GG83 5K048 AA08 BA37 CA03 DB01 DC01 DC07 EB02 EB03 EB10 HA04 HA06 HA37 5K101 KK12 LL01

Claims (2)

[Claims] In a remote monitoring system of gas supply pressure using a digital self-recording pressure gauge and a communication unit, alarm information is transmitted by communication when a pressure abnormality occurs, and pressure data before the occurrence of the abnormality is attached to the alarm information. A remote monitoring system for gas supply pressure, characterized in that the gas supply pressure is transmitted. 2. A gas supply pressure remote monitoring system having a digital self-recording pressure gauge, a communication unit, and a center device connected to the communication unit via a telephone line. The center device that has received the alarm information determines the content of the alarm information, and if it needs the pressure data before the occurrence of a pressure abnormality or the like from the content, automatically without disconnecting the line. A remote monitoring system for gas supply pressure, wherein a telegram of a pressure data request is sent out after that.