JPH0431027B2 - - Google Patents

Description

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

(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 Unexamined Patent Publication No. 123383/1983. 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 to centrally process 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 transmission to slave stations is not possible.

(Problem that the invention aims to solve) For this reason, even if an abnormality that requires urgent response occurs in the cathodic protection device corresponding to one of the slave stations, this cannot be immediately transmitted to the master station. , the slave station may have to wait until the sending command is issued.

Further, even if an abnormality occurrence signal is transmitted from the slave station to the master station, the master station cannot instruct the slave station to perform corresponding processing.

Furthermore, in systems that use the pipeline body and the ground as a signal transmission path, they are susceptible to noise such as stray current, which requires countermeasures, and the transmission distance is limited due to large signal attenuation. 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 Problem)
To explain based on FIGS. 3 to 3, the present invention applies to cathodic protection devices 2, _{2 1} , ₂ 2 _, . , line termination device 3, 3 ₁ , 3 ₂ , ..., 3 _o
Install slave stations 4, _{4 1} , 4 ₂ , ..., 4 _o equipped with
In addition, line termination devices 5, 5 ₁ , 5 ₂ , . . . corresponding to the respective slave stations 4 _{, 4} 1 , 4 ₂ , . . . , 4 _o are placed at appropriate locations.
..., 5 _o is installed, and the main station 6 and each of the slave stations 4, _{4 1} , 4 ₂ , ..., 4 _o are connected to dedicated lines 7, _{7 1} , 7 ₂ , ..., respectively. 7 Connect with _o ,
The slave stations 4 _{, 4 1} , 4 ₂ , . . . , 4 _o are provided with corrosion protection management data _collection and transmission means 8 , 8 ₁ , 8 ₂ , . 4 ₁ , 4
₂ ,..., ₄ constitutes a corrosion protection management data collection means 9 from the respective subordinate stations 4, ₄₁ , ₄₂ ,...,4
The control _means 10, _{10 1} , 10 ₂ , ..., 10 _o of the cathodic protection devices 2, 2 1 , _{2 2 ,} ..., 2 _o are configured in the main station 6, and the control means 10, 10 ₁ are provided in the main station 6. ,1
0 ₂ , . . . , 10 _o .

(Function) In the above configuration, each of the cathodic protection devices 2, 2 ₁ ,
2 ₂ , . . . , 2 _o perform corrosion protection by supplying an anticorrosion current to the structure 1 to be electrolytically protected based on preset conditions. and the respective cathodic protection devices 2, 2 ₁ , 2
Slave stations 4, 4 ₁ , 4 ₂ , ... corresponding to ₂ , ..., 2 _o
..., 4 _o is corrosion protection management data collection and transmission means 8, 8
₁ , 8 ₂ , ..., 8 _o , the cathodic protection device 2 , _{2 1} , 2 ₂ , ..., 2 is installed based on the preset procedure.
Corrosion control management data of _o , for example, potential difference between target structure 1 and reference electrode 12, corrosion prevention rectifier (not shown)
Collect measurement values such as output current and output voltage.

The corrosion protection management data collected at the slave stations ₄ , 4 1 , 4 ₂ , ..., 4 _o in this way is transmitted to the respective line termination devices 3 , _{3 1} , 3 ₂ , ..., 3 _o and the dedicated line 7 ，
7 ₁ , 7 ₂ , . . . , 7 _o and is collected by the line termination device 5 , 5 ₁ , 5 _{2 ,} . The corrosion protection management data of each cathodic protection device 2, _{2 1} , 2 ₂ , . . . , 2 _o can be centrally managed in the main station 6 .

At this _time , each slave station 4 _{, 4} 1 , 4 ₂ , . . _. , 4 _o has a control means 10 _, 10 ₁ , 10 ₂ , . The main station 6 has control _{means 10, 10 1 ,} 1
Since the main station ₆ constitutes the control signal sending means 11 to the slave stations 4 _, 4 ₁ , 4 ₂ ,
The control signal sending means 11 sends a control signal based on the corrosion protection management data sent from ..., 4 _o from time to time to the corresponding slave station 4, _{4 1} , 4 ₂ , ..., 4 _o , and the slave station 4, _{4 1} , 4 ₂ , ..., 4 _o , the control means 10 , 10 based on the control signal
₁ , 10 ₂ , ..., 10 _o by cathodic protection device 2,
2 ₁ , 2 _{2 ,} .

In the present invention, as described above, the main station 6 and each slave station 4, _{4 1} , 4 ₂ , ..., 4 _o have a one-to-one correspondence with the line termination devices 3 , _{3 1} , 3 ₂ , ... ...,3 _o ;5,
5 ₁ , 5 ₂ , ..., 5 _o and dedicated lines 7, _{7 1} , 7
₂ , ..., 7 _o , the collection of the corrosion protection management data can be carried out all the time, at appropriate intervals, or at any time according to a command from the main station 6. Device 2, _{2 1} , 2 ₂ ,
. . , 2 _o , the main station 6 can detect the occurrence of an abnormality such as a failure of equipment or the generation of noble potential in a very short time, and can perform predetermined abnormality response processing. Such abnormality response processing is performed at the main pole 6.
In addition to various processes such as displaying the occurrence of an abnormality that has identified the slave _station 4, 4 _{1 , 4 2} , ..., _4o , displaying and recording alarms and abnormalities, as described above, the slave station 4, 4 ₁ , 4 ₂ , ... …
..., 4 _o control means 10, 10 ₁ , 10 ₂ , ...,
10 _and the main station 6, it is possible to preset appropriate processing such as abnormality response processing by remote control in the case of an abnormality that can be controlled remotely as described above.

As explained above, in the present invention, the main station 6 and a large number of slave stations 4, 4 ₁ , 4 ₂ ,
..., 4 _o and dedicated lines 7, 7 ₁ , 7 ₂ , ..., respectively.
Since the line is connected via 7 _o , each slave station 4,
Cathodic protection device 2 corresponding to 4 ₁ , 4 ₂ , ..., 4 _o ,
Collection of corrosion protection management data for 2 ₁ , 2 ₂ , ..., 2 _o ,
and a cathodic protection device 2 based on this collected data,
2 ₁ , 2 ₂ , ..., 2 _o can be controlled at all times, at appropriate intervals, or at any time by commands from the main station 6.
Corrosion control management data of 2 ₁ , 2 ₂ , ..., 2 _o is sent to the main station 6.
In addition, based on the corrosion protection management data, it is possible to remotely control the cathodic protection devices 2, _{2 1} , 2 ₂ , . . . , 2 _o , such as controlling the corrosion protection current. Then, the main station 6 detects the occurrence of an abnormality such as equipment failure or generation of noble potential in the cathodic protection equipment 2, _{2 1} , 2 ₂ , ..., 2 _o in an extremely short time. It is possible to perform predetermined abnormality response processing. The above data is transmitted through dedicated lines 7, 7 ₁ , 7 ₂ , ..., 7 _o
Since the data transmission is performed via the transmission line, the required data transmission can be performed without being affected by noise or having a limited transmission distance, and the entire mechanism can be constructed at low cost.

In addition, the main station 6 and each slave station 4, 4 ₁ , 4 ₂ , ..., 4 _o
That is, data transmission may be performed in either full-duplex or half-duplex mode, and the number of lines may be appropriate. Furthermore, the mechanism of the present invention described above is based on one main station 6.
and a large number of corresponding slave stations 4, _{4 1} , 4 ₂ , ..., 4
_o as one independent system S, as shown in Figure 4, multiple systems S,
Each main station 6 of S ₁ , ..., S _o is connected to a higher station N
It can be configured as a hierarchical system managed by

(Embodiment) Next, an embodiment will be described. FIG. 5 shows an embodiment in which the main station 6 is configured as a computer system. Storage device,
16 is a printer, 17, 17 ₁ , 17 ₂ , ..., 1
7 _o is a modem as a line terminating device. In addition, FIG. 6 shows that the slave station 4 is connected to the microcomputer device 18.
This microcomputer device 18 is connected to terminals a, b, c, d, e, f, and g of the cathodic protection device 2, and is configured with a modem 19. The configuration is such that it collects corrosion protection management data and controls the device 2, and is connected to a terminal h of a modem 19 connected to a dedicated line 7. Note that terminals a and b of the electrolytic protection device 2 are terminals for measuring the output current and output voltage of the corrosion protection rectifier, respectively, and c is a relay contact terminal that operates when an abnormality occurs.
d is a relay contact input terminal that controls the cathodic protection device 2, e is an analog input terminal for controlling the corrosion protection current, and f and g are connected to the reference electrode 12 and the target structure 1, respectively, and a potential difference is created between them. This is a terminal for measurement. As shown in the seventh block diagram, this microcomputer device 18 sends the analog outputs of the terminals a, b, f, and g to a multiplexer 20 and an A/A converter 2 according to a predetermined procedure.
1, stored in the memory 24 via the insulation circuit 22 and the CPU 23. In this way, the corrosion protection management data is sequentially stored in the memory 24 at predetermined time intervals, but if the amount of data exceeds the storage capacity of the memory 24, the previous data is discarded and updated to the latest data. , the data in the memory 24 is retrieved in a last-in, first-out manner.

Thus, the CPU 23 transfers the corrosion protection management data stored in the memory 24 to the serial interface 2.
5. The signal is transmitted to the main station 6 via the voltage conversion circuit 26, the modem 19, and the dedicated line 7, and signals such as control signals from the main station 6 are input to the CPU 23 through the reverse route. The CPU 23 that received this control signal,
A predetermined analog control output is outputted to the terminal e of the cathodic protection device 2 via the D/A converter 27 to control the corrosion protection current.

When an abnormal situation such as generation of 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 28,
CPU 23 via parallel interface 29
Therefore, the CPU 23 can detect the occurrence of an abnormality, and then the CPU 23 notifies the main station 6 of the occurrence of the abnormality via the same route as the normal corrosion protection management data transmission circuit. Then, in response to a control signal from the main station 6 in response to the occurrence of such an abnormality, the CPU 23 controls the parallel interface 2.
9. A control output is output to the contact point d via the insulating circuit 28, and thus a predetermined relay in the electrolytic protection device 2 is operated, and abnormality processing is performed. In addition, code 30
is a timer that controls the above operations of the CPU 23 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, the cathodic protection devices for a large number of slave stations do not need to all have the same function; for example, cathodic protection devices for some of the n slave stations in the configuration shown in FIG. The corresponding cathodic protection device has terminals a, b, c, as shown in FIG.
It is also possible to adopt a configuration in which the master station does not have the functions corresponding to d and e, and the control signal is not sent from the master station to this slave station.

(Effects of the Invention) As described above, the present invention provides a large number of slave stations installed corresponding to each of the cathodic protection devices installed at a large number of distant locations of a structure to be protected against cathodic protection such as an underground pipeline; Since the line is connected to a common main station installed at an appropriate location via a dedicated line, the corrosion protection management data of each cathodic protection device can be collected at all times, at appropriate intervals, or at any time according to instructions from the main station. In this way, the corrosion protection management data of each cathodic protection device can be centrally managed at the main station, and based on this corrosion protection management data, the cathode protection device can be remotely controlled, and at the same time, it is possible to detect when an abnormality occurs in the cathodic protection device. In such a case, the main station can detect the abnormality within a very short time, and the slave station can perform predetermined abnormality response processing. The above data is transmitted via a dedicated line, so
The desired data transmission can be performed without being affected by noise or the transmission distance is limited, and the entire mechanism 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 , ..., 2 _o ... cathodic protection device, 3, 3 ₁ , 3 ₂ ,
..., 3 _o ... line terminal equipment, 4, 4 ₁ , 4 ₂ , ...
..., 4 _o ... slave, 5, 5 ₁ , 5 ₂ , ..., 5 _o ...
Line termination device, 6... Main station, 7, 7 ₁ , 7 ₂ ,...
..., 7 _o ... Dedicated line, 8 ... Corrosion protection management data collection and transmission means, 9 ... Corrosion protection management data collection means, 1
0, 10 ₁ , 10 ₂ , ..., 10 _o ... control means,
11... Control signal sending means, 12... Reference electrode.

Claims (1)

[Claims] 1. A slave station equipped with a line termination device is installed in each of the cathodic protection devices installed at a number of separate points in the structure subject to cathodic protection, and a line termination device corresponding to each of the slave stations is installed at an appropriate location. A master station is installed, and the master station and each of the slave stations are connected through a dedicated line, and the slave station is configured with means for collecting and transmitting corrosion protection management data, and the master station is configured with means for collecting corrosion prevention management data from each slave station. What is claimed is: 1. A remote centralized control mechanism for cathodic protection, characterized in that each slave station is provided with a control means for the cathodic protection device, and the main station is provided with a means for sending a control signal to the control means.