JPH0375634B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a remote centralized control mechanism for cathodic protection for remotely and centrally controlling cathodic protection of metal structures such as pipelines installed underground or underwater. It is something.

(Prior art) In order to remotely and centrally manage the corrosion protection status of metal structures such as underground pipelines, it is necessary to carry out corrosion protection management using cathodic protection equipment installed at many separate locations on the structure. Data must be centrally captured at a remote, predetermined location. In this regard, a corrosion protection management data transmission system has been known, for example, as disclosed in Japanese Patent Publication No. Sho 63-12942. This system installs slave stations (slave stations) for transmitting corrosion protection management data near the cathodic protection equipment installed at many separate points on the underground pipeline, and also installs slave stations at predetermined positions along the pipeline. A main station is installed for centrally managing corrosion protection management data, and the corrosion protection management data is transmitted from each slave station to the main station using the pipeline body and the ground as signal transmission paths. In this method, the master station issues a data transmission command to each slave station in sequence, and only the slave stations that receive this transmission command transmit data to the master station, and the appropriate slave station takes the initiative. Data cannot be transmitted to the main station.

(Problem to be solved by the invention) Therefore, even if an abnormality that requires urgent response occurs in the cathodic protection device corresponding to any slave station, this can be immediately transmitted to the master station. First, there is a problem in that the slave station may have to wait until a sending command is issued. In addition, in a system that uses the pipeline body and the ground as a data transmission path, it is susceptible to stray currents and other effects from the nozzle, and countermeasures must be taken to deal with this.In addition, due to the large signal attenuation, the transmission distance There are problems in that transmission is limited and requires the installation of repeaters, and in cases where the target structure is electrically discontinuous, transmission is impossible.

The present invention aims to solve the above problems.

(Means for solving the problems)
To explain based on _{FIG . , . _}
…, 4 _o ) with slave station 5 (5 ₁ , 5 ₂ , …, 5 _o )
and a main station 7 equipped with a line termination device 6 (6a, 6b,...) at an appropriate location via the switched line 3.
The slave station 5 includes a corrosion protection management data collection and transmission means 8, a corrosion protection abnormality detection means 9, and an automatic dialing means 10 to the main station 7, which is activated when the corrosion protection abnormality detection means 9 detects an abnormality. In addition, the main station 7 is provided with each of the slave stations 5 (5 ₁ , 5
₂ ,..., _5o ); automatic dialing means 11;
Corrosion protection management data collection means 12 that collects corrosion protection management data from slave stations 5 in a line-connected state via the line termination device 6, and slave stations 5 that correspond to the abnormality detection.
A line connection control means 13 is provided for controlling line connection based on a call from a user.

In addition, the invention described in claim 2 is
In the cathodic protection remote centralized control mechanism described in Section 1, each slave station 5 (5 ₁ , 5 ₂ , ..., 5 _o ) has a control means 14 for the cathodic protection device 2 ( 2 ₁ , 2 ₂ , ..., 2 _o ). At the same time, the master station 7 has a slave station 5 connected to the line.
Furthermore, a control signal sending means 15 for sending a control signal to the control means 14 is configured.

(Function) In the above configuration, each cathodic protection device 2 (2 ₁ ,
2 ₂ ,..., 2 _o ) performs corrosion protection by supplying an anti-corrosion current to the structure 1 to be cathodic-protected based on preset conditions. And each cathodic protection device 2 (2 ₁ ,
slave station 5 (5 ₁ , _{5 2} , 2 _o ) corresponding to
..., _5o ) is collected by the corrosion protection management data collection and sending means 8 based on a preset procedure to collect the corrosion protection management data of the cathodic protection device 2, such as the potential difference between the target structure 1 and the reference electrode 16, the corrosion protection rectifier ( Collect measured values such as the output current and output voltage (not shown).

Thus, the master station 7 automatically dials each slave station 5 at preset time intervals using the automatic dialing means 11.
(5 ₁ , 5 ₂ ,..., 5 _o ) are sequentially called to make the line connection state, and then the line termination device 6, the switched line 3, and the line termination device 4 of the slave station 5 in the line connection state are called.
A data sending command is issued. The slave station 5 that has received the data transmission command transmits the corrosion protection management data collected in the corrosion protection management data collection and transmission means 8 via the line termination device 4, the switched line 3, and the line termination device 6 according to a preset procedure. Send to main station 7. The main station 7 then collects the corrosion protection management data into the corrosion protection management data collection means 12 and performs predetermined processing.
When the predetermined communication with the slave station 5 is completed, the line is disconnected, and then another slave station is called and the same process as above is performed.

In this way, under normal conditions, the main station 7
sequentially transmits the corrosion protection management data of each cathodic protection device 2 (2 ₁ , 2 ₂ , ..., 2 _o ) corresponding to each slave station 5 (5 ₁ , _{5 2} , ..., 5 _o ) via the switched line 3. In this way, the corrosion protection management data of the cathodic protection devices 2 (2 ₁ , 2 ₂ , . . . , 2 _o ) distributed over a wide area can be centrally managed at the main station 7 .

At this time, each slave station 5 (5 ₁ , 5 ₂ , ..., 5 _o ) is configured with the control means 14 for the cathodic protection device 2 ( 2 ₁ , 2 ₂ , ..., 2 _o ), and the main station 7 is provided with the following: By configuring the control signal sending means 15 that sends the control signal of the control means 14 to the slave station 5 connected to the line, the main station 7 can control the control signal based on the corrosion protection management data sent from the slave station 5. Signal sending means 15
is transmitted to the slave station 5, and based on the control signal, the cathodic protection device 2 can be controlled by the control means 14 in the slave station 5, thus making it possible to carry out remote control, for example, controlling the corrosion protection current. .

When an abnormality such as equipment failure occurs in one of the cathodic protection devices, for example, the device 2 ₁ , and the corrosion protection abnormality detection means 9 detects this, the slave station 5 ₁ operates the automatic dialing means 11, Exchange line 3
Call the main station 7 via , connect the line,
The data corresponding to the abnormality is sent to the main station 7 through the same route as the normal corrosion protection management data.
The main station 7 then performs a predetermined abnormality handling process corresponding to the abnormality handling data.

Such abnormality response processing includes, in the main station 7, displaying the occurrence of an abnormality that has identified the slave station 5, displaying and recording alarms and abnormality contents, and, as mentioned above, the control means 14 and the control means 14 in the slave station 5. In a configuration in which the main station 7 is provided with the control signal sending means 15, appropriate processing can be set in advance, such as abnormality response processing by remote control in the case of an abnormality that can be controlled remotely as described above.

As mentioned above, when an abnormality occurs in the cathodic protection device 2 ₁ and the slave station 5 ₁ calls the main station 7 via the exchange line 3, the master station 7 connects the line with other slave stations 5 ₂ ,..., 5 _o . If the main station 7 is in the connected state, the main station 7 operates the line connection control means 13 according to a preset procedure to perform control to give priority to the line connection with the slave station 5 ₁ .

Control of such line connections can be performed according to various procedures such as those described below.

First, when the number of lines of the master station 7 for the switched line 3 is one, the master station 7 connects other slave stations 5 ₂ ,...,
If the line is normally connected to 5 _o , communication with other slave stations 5 ₂ ,..., 5 _o is temporarily interrupted and the line is disconnected, and then the line is connected to slave station 5 ₁ that called the main station 7. The procedure for calling the slave stations 5 ₂ , ..., 5 _o , whose communication has been temporarily interrupted, again from the master station 7 to set the line connection state after performing the prescribed communication as the state, and the procedure for making the slave stations 5
After the predetermined communication with another slave _station 5 ₂ ,..., 5 _o that was connected to the line when the main station 7 was called by the slave station 5 1 is completed, the line is connected to the slave station 5 ₁ that called the main station 7. The line connection with the slave station ₅₁ that called the master station 7 is established by performing prescribed communication procedures as a connected state.
Priority can be given to line connections with other slave stations 5 ₂ , ..., 5 _o . In such a case, the procedure has the advantage that although normal communication with the other slave stations 5 ₂ , ..., 5 _o is temporarily interrupted, the time required for notification from the slave station 5 ₁ where an abnormality has occurred to the master station 7 is short. The reverse procedure is to temporarily suspend normal communication, instead of requiring the time required for normal communication per slave station as waiting time to notify the main station 7 of the occurrence of an abnormality from the slave station ₅₁ . The advantage is that there is no Next, in the above procedure, when the main station 7 and the slave station ₅₁ where the abnormality has occurred are in a line connection state,
An abnormality also occurred in the other slave stations 5 ₂ ,..., 5 _o, and the main station 7
, the line connection control means 13 may connect the slave stations 5 ₂ , . . . , 5 _o sequentially in a queue.

Next, when the number of lines of the master station 7 to the switching circuit 3 is plural, the slave station 5 ₁ in which the abnormality has occurred,
When calling the master station 7 via a line connected to other slave stations 5 ₂ ,..., 5 _o , the line connection control means 13 first calls the slave station 5 ₁ and the master station 7 via an empty line. By controlling the line connection between
As mentioned above, control is performed to prioritize the line connection with the relevant slave station ₅₁ , and in this case, if there is no idle line, priority is given according to the same procedure as in the case where the number of lines is single as described above. can be controlled. As explained above, in the present invention, a large number of slave stations 5 (5 ₁ , 5 ₂ , ..., 5 _o ) are sequentially called from the main station 7 and each cathodic protection device 2 corresponding to each slave station 5 is called. (2 ₁ , 2 ₂ ,..., 2 _o ) corrosion protection management data can be collected sequentially and centrally managed in the main station 7, and if an abnormality occurs in any of the slave stations 5. In this case, the slave station 5 can independently call the master station 7 and notify the occurrence of an abnormality, so that the master station 7 can promptly detect the occurrence of an abnormality and take appropriate action. . Since these data are transmitted via the exchange line 3, the required data can be transmitted without being affected by the nozzle or with any limitations on the transmission distance. By using a public line as the exchange line 3, the entire mechanism of the present invention can be constructed at low cost.

The mechanism of the present invention explained above is based on one main station 7.
and a corresponding number of slave stations 5 (5 ₁ , 5 ₂ ,..., 5 _o )
In addition to configuring one system S independent from the above, as shown in _FIG .
..., S _o ) can be configured as a hierarchical system managed by a higher-ranking station N.

(Embodiment) Next, an embodiment will be described. FIG. 5 shows an embodiment in which the main station 7 is configured as a computer system. Storage device,
20 is a printer, 21 and 21' are modems, and 22 is a two-line line switch. In addition, FIG. 6 shows that the slave station 5 is connected to a microcomputer device 23 and a modem 24
This microcomputer device 23 is connected to the terminals a, b, c, d, e, f, and g of the cathodic protection device 2, and reads the corrosion protection management data of the cathodic protection device 2. It collects information and controls the device 2, and is connected to a terminal h of a modem 24 connected to an exchange line 3. Note that terminals a and b of the cathodic protection device 2 are terminals for measuring the output current and output voltage of the corrosion protection rectifier, respectively, c is a relay contact terminal that operates when an abnormality occurs, and d is a relay contact input that controls the cathodic protection device 2. The terminal e is an analog input terminal for controlling the corrosion protection current, and the terminals f and g are terminals connected to the reference electrode 16 and the target structure 1, respectively, and for measuring the potential difference therebetween. As shown in the block diagram in FIG. 7, such a microcomputer device 23 has terminals a, b, f,
The analog output of
7, and stored in the memory 29 via the CPU 28. In this way, the corrosion protection management data is sequentially stored in the memory 29 at predetermined time intervals, but if the amount of data exceeds the storage capacity of the memory 29, the previous data is discarded and updated to the latest data one after another. ,
The data in the memory 29 is retrieved in a last-in, first-out manner.

Thus, the data sending command from the main station 7 is inputted to the microcomputer device 23 as a predetermined serial signal from the terminal h of the modem 24, and then inputted to the CPU 28 via the voltage conversion circuit 30 and serial interface 31. Upon receiving this data transmission command, the CPU 28 transmits the latest corrosion protection management data to the main station 7 via the serial interface 31, voltage conversion circuit 30, modem 24, and exchange line 3 according to a predetermined procedure. When receiving the control signal for the cathodic protection device 2 from the main station 7 via the path, the CPU 28 outputs a predetermined analog control output to the terminal e of the cathode protection device 2 via the D/A converter 32. to control the anti-corrosion current.

When an abnormal situation such as generation of a noble potential occurs and the relay in the cathodic protection device 2 operates, the operating signal of the contact is transmitted from the terminal c to the insulation circuit 33,
CPU 28 via parallel interface 34
Therefore, the CPU 28 can detect the occurrence of an abnormality, and then, according to a predetermined procedure, the CPU 28 operates the automatic dialing means 10 provided in the modem 24 to call the main station 7 as described above. . Then, due to such a call, the main station 7
and the slave station 5 are connected to the line, and a predetermined control signal is sent from the master station 7 to the CPU 28 via the above-mentioned path.
, the CPU 28 outputs a control output to the contact point d via the parallel interface 34 and the insulation circuit 33, thereby operating a predetermined relay in the electrolytic protection device 2, and performing abnormality processing.
Incidentally, reference numeral 35 is a timer that controls the above operations of the CPU 28 and the like.

In addition to the above-described embodiments, the specific circuits and the like of each configuration are arbitrary. Furthermore, in the present invention, it is not necessary that the cathodic protection devices corresponding to a large number of slave stations all have the same function; for example, in the configuration shown in FIG.
The cathodic protection devices corresponding to some of the slave stations do not have the functions corresponding to terminals a, b, c, d, and e shown in Fig. 6, and control signals from the master station are not transmitted to these slave stations. It is also possible to have a configuration in which the data is not sent.

(Effects of the Invention) As described above, the present invention mainly uses a large number of slave stations installed corresponding to each of the cathodic protection devices installed at a large number of distant locations on a structure subject to cathodic protection such as an underground pipeline. The corrosion protection management data of each cathodic protection device corresponding to each slave station can be collected sequentially by calling from the station, and can be centrally managed at the main station. When an abnormality occurs, the slave station can independently call the master station and notify it of the abnormality, allowing the master station to quickly detect the occurrence of the abnormality and take appropriate action. The effect is that it can be done. In addition, since this data is transmitted via a switched circuit, the required data can be transmitted without being affected by noise or having limited transmission distance. By utilizing this, there is an effect that the entire mechanism of the present invention can be constructed at low cost.

[Brief explanation of drawings]

Fig. 1 is a system explanatory diagram schematically representing the basic concept of the present invention, Figs. 2 and 3 are system explanatory diagrams representing the constituent elements of the basic concept, and Fig. 4 is a system explanatory diagram showing the basic concept of the present invention. Fig. 5 and Fig. 6 are system explanatory diagrams showing specific examples of the main station and slave station sides, respectively, and Fig. 7 shows a specific example of the main part configuration of the slave station. FIG. Code 1...Structure subject to cathodic protection, 2 (2 ₁ , 2
₂ ,..., _2o )...Cathodic protection device, 3...Switched line, 4( _{41,42 ,} ..., _4o )...Line termination device,
5 (5 ₁ , 5 ₂ ,..., 5 _o ) ... slave, 6 (6a,
6b,...,)...Line termination device, 7...Main station, 8
...Corrosion protection management data collection and sending means, 9...Corrosion protection abnormality detection means, 10, 11...Automatic dialing means, 12...Corrosion protection management data collection means, 13...
Line connection control means, 14... Control means, 15...
Control signal sending means, 16... reference electrode.

Claims (1)

[Scope of Claims] 1. A slave station equipped with a line termination device connected to a predetermined exchange line is installed in each of the cathodic protection devices installed at a number of distant locations of the structure to be electrolyzed, and the exchange A main station equipped with a line termination device is installed at an appropriate location along the line, and the slave station includes corrosion protection management data collection and transmission means, corrosion protection abnormality detection means, and is activated when an abnormality is detected by the corrosion protection abnormality detection means.
In addition to configuring automatic dialing means for the master station, the master station also includes an automatic dialing means for each of the slave stations, and a corrosion control system for collecting corrosion control management data from the slave stations connected to the line via the line termination device. A remote centralized management mechanism for cathodic protection, characterized in that it comprises a management data collection means and a line connection control means for controlling line connection by a call from a slave station when the abnormality is detected. 2. In the cathodic protection remote centralized management mechanism described in paragraph 1, each slave station is configured with a control means for the cathode protection device, and the main station is configured to send control signals to the control means to the slave stations connected to the line. 1. A remote centralized management mechanism for cathodic protection, characterized in that it comprises control signal sending means for sending out control signals. 3. The cathodic protection remote centralized control mechanism according to paragraph 1 or paragraph 2, characterized in that the exchange line is a public line.