JP5905374B2 - Cathodic protection remote monitoring system - Google Patents

Description

  The present invention relates to a cathodic protection remote monitoring system that remotely monitors the operating status of a cathodic protection facility such as an external power supply device.

  Patent Document 1 below describes a cathodic protection facility and a remote monitoring system for anticorrosion data. This prior art includes an anticorrosion data monitoring device and a monitoring data collecting device that collects monitoring data of the anticorrosion data monitoring device. The anticorrosion data monitoring apparatus here includes data measuring means for measuring anticorrosion data including a coupon (probe) current, and transmission means for transmitting the anticorrosion data measured by the data measuring means to the monitoring data collecting apparatus. . The monitoring data collecting device includes a receiving unit that receives the anticorrosion data transmitted by the transmitting unit, a storage unit that stores the anticorrosion data received by the receiving unit, a display unit that displays the anticorrosion data, and the anticorrosion data. And an abnormality detecting means for detecting the abnormality.

JP 2004-83996 A

  If an abnormality is monitored in the anticorrosion data by the conventional remote monitoring system described above, and the cause of the abnormality is thought to be the deterioration of the anode in the external power source type cathodic protection facility, the anode can be replaced. I need it. However, the anode of the external power source type cathodic protection facility is usually buried deep underground (for example, 120 m below ground), so that construction by boring is required. For this reason, replacing and replacing one anode requires a large construction cost and construction period, and the anode replacing and replacing work cannot be completed immediately. As described above, the conventional remote monitoring system has a problem in that even if an abnormality of the anticorrosion data is monitored, when the cause of the abnormality is degradation of the anode, it is not possible to quickly cope with it.

  The present invention has been proposed to deal with such a situation. That is, as a result of remote monitoring of the cathodic protection facility, even if a situation in which quick repair is difficult, such as deterioration of the anode of the external power source cathodic protection facility, is confirmed, the anticorrosion of the anticorrosive object can be performed by emergency measures. The object of the present invention is that the state can be returned to an appropriate state.

  In order to achieve such an object, a cathodic protection remote monitoring system according to the present invention comprises at least the following configuration.

  A center server, connected to the center server via a communication line and individually connected to a plurality of cathodic protection facilities, measuring a total circuit resistance of the cathodic protection facility, and transmitting the measured resistance to the center server; An anti-corrosion monitoring device that receives an instruction signal from and controls the output of the cathodic anti-corrosion facility, and the center server measures the total circuit resistance when the received total circuit resistance indicates an abnormal value. Select another cathodic protection facility capable of preventing the anticorrosion range of the cathodic protection facility and increasing the output, and output the output of the cathodic protection facility to the anticorrosion monitoring device connected to the selected other cathodic protection facility. A cathodic protection remote monitoring system, wherein an instruction signal for raising is transmitted.

  If there is an abnormality in the total circuit resistance measurement result at the cathodic protection facility, the center server selects a nearby cathodic protection facility that can assist the cathodic protection facility with an abnormality, and outputs it to the cathodic protection facility. As the cause of the abnormality is the anode deterioration of the external power source cathodic protection facility, it is possible to return the anticorrosion state of the anticorrosion target to an appropriate state by the first aid. In addition, it is possible to reduce the corrosion risk of the anticorrosive object.

It is explanatory drawing which showed the structural example of the cathodic protection remote monitoring system which concerns on one Embodiment of this invention. It is explanatory drawing which showed the structural example of the cathodic protection facility and anticorrosion monitoring apparatus in embodiment of this invention. It is explanatory drawing which showed an example of the measuring method of remote monitoring information. It is explanatory drawing which showed the various functions of the center server in the cathodic protection remote monitoring system which concerns on embodiment of this invention. It is explanatory drawing which showed the centralized management function of the some cathodic protection facility by the center server in embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing a configuration example of a cathodic protection remote monitoring system according to an embodiment of the present invention. The cathodic protection system according to the embodiment of the present invention is provided at each site where a plurality of cathodic protection facilities 1 (1-1, 1-2,...) And the cathodic protection facility 1 are installed. And a central server 5 connected to the anticorrosion monitoring device 2 via a communication line.

  The communication line connecting the anticorrosion monitoring device 2 and the center server 5 is a line capable of bidirectional communication, and can be performed via the repeater 4 as shown in the figure, for example. In this example, the anticorrosion monitoring device 2 and the repeater 4 including the wireless information communication network 4A are connected so as to be capable of two-way communication by wireless communication, and the exchange / router 4B of the repeater 4 and the router 5A of the center server 5 are connected. Are connected to each other by a dedicated line 6 so as to be capable of bidirectional communication.

  The center server 5 includes, for example, a terminal management server 5B, a database server 5C, and an application server 5D. In this example, the terminal management server 5 </ b> B has a function of managing the information terminal 7 that can access the center server 5. The database server 5C has a function of storing information sent from the anticorrosion monitoring device 2 in a database. The application server 5D has a function of providing application software (remote monitoring information display means) for outputting information stored in the database server 5C to the display unit 7A of the information terminal 7 connected via the Internet.

  FIG. 2 is an explanatory diagram showing a configuration example of the cathodic protection facility and the anticorrosion monitoring device according to the embodiment of the present invention. The illustrated cathodic protection facility 1 is an external power source type cathodic protection device that supplies an anticorrosion current from an underground anode 1B to an embedded pipeline P, which is an anticorrosion object. Here, the target cathodic protection facility 1 only needs to have the external power supply device 1A, and may be a forced drainer or the like in addition to the illustrated example.

  The external power supply apparatus 1A of the cathodic protection facility 1 is operated by, for example, an AC power supply 10, and the output of the AC power supply 10 is adjusted by a transformer and converted into direct current by a rectifier. An anticorrosion monitoring device 2 is connected to the external power supply device 1A.

  The anticorrosion monitoring device 2 is arranged at each installation site of the cathodic protection facility 1 and connected to the cathodic protection facility 1, and is always driven by the AC power supply 10. An AC relay 11 is provided on the electric power supply line of the AC power supply 10. When the AC power supply 10 becomes abnormal in power supply such as a power failure or lightning, the AC relay 11 is cut off and is always turned off upon detection of this. The battery switch 21 is turned on. Thereby, the power supply of the anticorrosion monitoring device 2 is switched to the battery 20 when the power supply of the AC power supply 10 is abnormal. The battery 20 is normally charged by a charger 22 connected to the AC power source 10.

  The anticorrosion monitoring means 2 includes a measurement control means 23 and a bidirectional communication means 24. The anticorrosion monitoring means 2 includes an information storage means 25. The measurement control means 23 measures the anticorrosion information of the pipeline P, which is the anticorrosion object, and the operation information of the cathode anticorrosion facility 1. The anticorrosion information measured by the measurement control means 23 is a pipe ground potential and a coupon direct current density in the illustrated example. The tube-to-ground potential is obtained by measuring a potential difference between the reference electrode 26 installed in the ground and the pipeline P, which is an anticorrosion object, with a voltmeter 26A. The coupon direct current density is obtained by measuring the current flowing into the coupon 27 installed in the ground and flowing through the pipeline P, which is an anticorrosion object, by the ammeter 27A, and calculating the current value. .

  One of the operation information of the cathodic protection facility 1 measured by the measurement control means 23 is the total circuit resistance of the cathodic protection facility 1. The total circuit resistance can be obtained by dividing the average value of the output voltage during the set measurement time (for example, 2 hours) by the average value of the output current during the set measurement time. The output voltage is measured by a voltmeter 28 connected between the input / output terminals of the external power supply device 1A, and the output current is measured by an ammeter 29 inserted in the wiring between the output terminal of the external power supply device 1A and the anode 1B. . This total circuit resistance is composed of the ground resistance of the anode 1B and the pipeline P, which is the cathode, the resistance of the electrolyte (soil, water, etc.), the wiring resistance in the cathodic protection facility 1, and the resistance of the contact point between the metal and metal. It becomes an indicator such as deterioration of the anode 1B.

  The measurement control means 23 controls the output of the cathodic protection facility 1 by controlling the external power supply device 1A. The measurement control means 23 controls the output of the cathodic protection facility 1 on the basis of the measured anticorrosion information (tube-to-ground potential and / or coupon DC current density) of the anticorrosion object or the measured operation information of the cathodic protection facility 1. Further, the measurement control means 23 also controls the output of the cathodic protection facility 1 by an instruction signal sent from the center server 5.

  The two-way communication unit 24 receives information from the center server 5 and transmits to the center server 5 operation information of the cathodic protection facility 1 and measured anticorrosion information (remote monitoring information) of the anticorrosion object. The remote monitoring information transmitted to the center server 5 by the two-way communication means 24 includes power supply abnormality notification information (a) indicating whether or not the power supply of the cathodic protection facility 1 is on, and the output voltage of the cathodic protection facility 1 ( b), output current (c) of the cathodic protection facility 1, total circuit resistance (d), tube-to-ground potential or coupon DC current density (e). The above-described (a) to (d) are the operation information of the cathodic protection facility 1, and (e) is the anticorrosion information of the anticorrosion object. In addition, the bidirectional communication unit 24 receives an instruction signal from the center server 5 and outputs it to the measurement control unit 23.

  FIG. 3 is an explanatory view showing an example of a remote monitoring information measuring method. Here, a measurement section every two hours in the measurement time is referred to as a unit. One unit of 2h is composed of 7200 subunits (indicated as “sub 1”, “sub 2”, etc. in FIG. 3), and one subunit is 1 s. In one subunit, each information of tube-to-ground potential or coupon current density, output voltage, and output current is measured at intervals of 0.1 ms. As a result, 10,000 pieces of measurement data are obtained in one subunit. In one subunit, data processing is performed immediately after obtaining 10,000 pieces of measurement data, and the average of the 10,000 pieces of measurement data is obtained, and the measured tube-to-ground potential or coupon current density, output voltage, and output current information are obtained. The value for each subunit is output.

  In one unit, measurement and data processing for each subunit are repeated, and a value for each of 7,200 subunits is obtained. Immediately after the measurement and data processing of one unit is completed and the value for each of 7200 subunits is obtained, the data processing for each unit is performed, and the average value of the values for each of 7200 subunits in each information, Output the maximum and minimum values. The average value, maximum value, and minimum value of one unit of each information obtained here are stored in the information storage means 25 described above.

  Transmission of the obtained information to the center server 5 is performed once a day, for example. That is, after the measurement is started from the even time and 12 units of information are obtained per day (24 hours), the bidirectional communication unit 24 transmits the stored information of each unit to the center server. The transmission frequency once a day can be said to be an appropriate transmission frequency in consideration of the operating state of the cathodic protection facility 1 and communication costs.

  On the other hand, the transmission of the power supply abnormality notification information described above is transmitted to the center server 5 by the bidirectional communication means 24 when a power supply abnormality of the AC power supply 10 is detected. Specifically, a detection signal indicating that the AC relay 11 has been disconnected due to an abnormality in the power supply of the AC power supply 10 is input to the bidirectional communication means 24, and the bidirectional communication means 24 detects the power supply abnormality notification information based on this detection signal. Is transmitted to the center server 5.

  Each of the plurality of anticorrosion monitoring devices 2 has unique identification information (IP address), and the bidirectional communication means 24 of each anticorrosion monitoring device 2 sends various information to the center server 5 in combination with this identification information. Send. Therefore, on the center server 5 side, it is possible to grasp where the information sent from the received identification information is the information from the anticorrosion monitoring device 2 installed at the site.

  FIG. 4 is an explanatory diagram showing various functions of the center server in the cathodic protection remote monitoring system according to the embodiment of the present invention. The center server 5 includes a power supply abnormality confirmation unit 50 that grasps where the power supply abnormality has occurred by receiving the above-described power supply abnormality notification information. When power supply abnormality notification information is sent to the center server 5, the power supply abnormality confirmation means 50 generates power supply abnormality at any site where the cathodic protection facility is installed based on the identification information sent together with the power supply abnormality notification information. Make sure that

  The center server 5 includes an information transmission request unit 51 that transmits a request for transmission of anticorrosion information to the bidirectional communication unit 24 upon reception of the power supply abnormality notification information. The information transmission request unit 51 identifies the anticorrosion monitoring device 2 as the transmission source based on the identification information transmitted together with the power failure notification information, and outputs a corrosion request information transmission request signal to the identified anticorrosion monitoring device 2. The anticorrosion monitoring apparatus 2 that has received the transmission request signal transmits the information stored in the information storage means 25 to the center server 5 regardless of the information transmission frequency at all times, and then the information stored for each unit. Are transmitted to the center server 5 at set time intervals.

  The center server 5 includes facility management information storage means 52. In the database server 5C of the center server 5, management information of a plurality of cathodic protection facilities 1 managed by the center server 5 is stored. This management information includes the rated output (rated output current and rated output voltage) of the external power supply device 1A in each cathode protection facility 1, installation location information (such as map information) of each cathode protection facility 1, and individual cathode protection. This is system information of the pipeline to which the facility 1 is connected. The facility management information storage means 52 associates the management information of the plurality of cathodic protection facilities 1 stored in the database server 5C with the identification information (IP address) of the anticorrosion monitoring device 2 connected to each of the cathodic protection facilities 1. Managed and saved.

  The center server 5 includes a remote monitoring information storage unit 53. Remote monitoring information (operation information of the cathodic protection facility 1 and anticorrosion information of the pipeline P) sent from the anticorrosion monitoring device 2 connected to each cathodic protection facility 1 to the center server 5 by the remote monitoring information storage means 53 is These are stored in the database server 5C as needed for each anticorrosion monitoring device 2 of the transmission source.

  The center server 5 includes remote monitoring information display means 54. The remote monitoring information display means 54 has a function of sending information stored in the remote monitoring information storage means 53 of the database server 5C to the information terminal 7 connected to the center server 5 via the Internet and displaying it on the display unit 7A. Have.

  The center server 5 includes remote output control means 55 for controlling the output of the cathodic protection facility 1 selected from the center server 5 side. The remote output control means 55 sends an instruction signal to the bidirectional communication means 24 in the anticorrosion monitoring apparatus 2 connected to each cathode anticorrosion facility 1, and the bidirectional communication means 24 outputs the instruction signal to the measurement control means 23. Thus, the measurement control unit 23 controls the output (output current or output voltage) of the external power supply device 1A in the cathode anticorrosion facility 1.

  The remote output control means 55 of the center server 5 specifies the cathodic protection facility 1 (1-1) in which the total circuit resistance is measured when the total circuit resistance indicates an abnormal value from the received remote monitoring information, The other cathodic protection facility 1 (1) is selected by selecting another cathodic protection facility 1 (1-2) capable of preventing the corrosion of the cathodic protection facility 1 (1-1) and increasing the output. -2) An instruction signal for increasing the output of the cathodic protection facility 1 (1-2) is transmitted to the anticorrosion monitoring device 2 connected to -2.

  Here, the judgment as to whether or not the anticorrosion range of the cathodic protection facility 1 (1-1) is anticorrosive is made based on the facility management information managed by the center server 5, and the cathodic protection facility 1 (1- 1) A nearby cathodic protection facility 1 is selected. Whether the output of the cathodic protection facility 1 can be increased or not is determined based on the rating of the cathodic protection facility 1, which is one of the facility management information managed by the center server 5, and the output voltage transmitted. The output voltage is selected with respect to the rating.

  FIG. 5 is an explanatory diagram showing a centralized management function of a plurality of cathodic protection facilities by the center server. One center server 5 manages a plurality of cathodic protection facilities 1 in a wide area Ar. Each cathode anticorrosion facility 1 is connected with an anticorrosion monitoring device 2, and each anticorrosion monitoring device 2 connected to the plurality of cathode anticorrosion facilities 1 and the center server 5 are connected by a communication line in a state where bidirectional communication is possible. Yes.

  The center server 5 stores the remote monitoring information sent from each anticorrosion monitoring device 2 at a transmission frequency of once a day in the database server 5C, and the operation status of each cathodic protection management facility 1 and each cathodic protection facility 1 The anti-corrosion status of the pipeline P that is anti-corrosive is managed. For example, when the total circuit resistance of a certain cathodic protection facility 1 (1-1) shows an abnormal value and the anode deterioration of the facility A is confirmed from the value of the total circuit resistance, the most recent cathodic protection facility 1 (1) -2) is considered. In order to perform backup by the cathodic protection facility 1 (1-2), first, from the facility management information of the cathodic protection facility 1 (1-2) and the anticorrosion monitoring device 2 connected to the cathodic protection facility 1 (1-2). The remote monitoring information sent is confirmed, it is confirmed how much the output can be increased from the current operating status with respect to the rated output of the cathodic protection facility 1 (1-2), and the output can be increased. In this case, the output of the cathodic protection facility 1 (1-2) is controlled to increase, and the anticorrosion information sent from the anticorrosion monitoring device 2 connected to the cathodic protection facility 1 (1-1) becomes a normal value. Until it becomes, the output increase of the cathodic protection facility 1 (1-2) is continued. At this time, when the pipeline in the cathodic protection range of the cathodic protection facility 1 (1-1) and the pipeline in the cathodic protection range of the cathodic protection facility 1 (1-2) are connected by an insulating joint, the insulating joint It is necessary to take measures to connect the pipelines at both ends of the cable with cables.

  The replacement work of the deteriorated anode requires a boring work for digging the anode buried deep underground (for example, 120 m below ground), which requires a large amount of construction cost and a long construction period. I can't. Therefore, it is possible to take an emergency measure when the anode is deteriorated by performing the backup by the above-mentioned latest facility.

  When power failure notification information is sent from the anticorrosion monitoring device 2 connected to a certain cathodic protection facility 1 to the center server 5, the center server 5 immediately sends an information transmission request to the anticorrosion monitoring device 2. The anticorrosion monitoring device 2 that has received the message transmits the remote monitoring information immediately before the power failure and the subsequent remote monitoring information to the center server 5 as needed. As a result, the center server 5 side can consider the subsequent response while confirming the anticorrosion status of the pipeline after the power failure.

1: Cathodic protection facility, 1A: external power supply, 1B: anode,
2: anticorrosion monitoring device, 20: battery, 21: battery switch,
22: charger, 23: anticorrosion information measuring means,
24: Two-way communication means, 25: Information storage means,
26: Reference electrode, 26A, 28: Voltmeter,
27: Coupon, 27A, 29: Ammeter,
4: Repeater, 4A: Wireless information communication network, 4B: Switch / router,
5: Center server, 5A: Router, 5B: Terminal management server,
5C: Database server, 5D: Application server,
50: Power failure confirmation means 51: Information transmission request means,
52: Facility management information storage means, 53: Remote monitoring information storage means,
54: Remote monitoring information display means, 55: Remote output control means,
6: dedicated line, 7: information terminal, 7A: display unit,
10: AC power supply, 11: AC relay,
P: Pipeline

Claims (5)

With the center server,
Connected to the center server via a communication line and individually connected to a plurality of cathodic protection facilities, measuring the total circuit resistance of the cathodic protection facility and transmitting to the center server, an instruction signal from the center server And an anti-corrosion monitoring device for controlling the output of the cathodic anti-corrosion facility,
When the received total circuit resistance shows an abnormal value, the center server selects another cathodic protection facility capable of preventing the corrosion protection range of the cathode protection facility where the total circuit resistance is measured and capable of increasing the output. A cathode corrosion prevention remote monitoring system, wherein an instruction signal for increasing the output of the cathode corrosion prevention facility is transmitted to the corrosion prevention monitoring device connected to the selected other cathode corrosion prevention facility. The anticorrosion monitoring device is:
Measurement control means for measuring the anticorrosion information of the anticorrosion object and the operation information of the cathode anticorrosion facility, and controlling the output of the cathodic anticorrosion facility based on the measured information or the instruction signal from the center server,
2. A bidirectional communication unit that receives an instruction signal from the center server, outputs the instruction signal to the measurement control unit, and transmits information measured by the measurement control unit to the center server. Cathodic protection remote monitoring system. The center server is
Facility management information storage means for storing management information of the cathodic protection facility;
Remote monitoring information storage means for storing the operation information and the anticorrosion information for each cathode anticorrosion facility;
3. The cathodic protection remote monitoring system according to claim 1, further comprising remote output control means for transmitting the instruction signal to the selected cathodic protection facility. The center server is
4. The cathodic protection monitoring system according to claim 3, further comprising remote monitoring information display means for outputting information stored in the remote monitoring information storage means to a display unit of an information terminal connected via the Internet. The cathodic protection facility is operated by an AC power source,
The anticorrosion monitoring device is normally driven by the AC power source, and is switched to battery driving when the AC power source is abnormal.
The bidirectional communication means transmits power supply abnormality notification information to the center server when the power supply of the AC power supply is abnormal.
4. The cathode anticorrosion remote monitoring system according to claim 3, wherein the center server makes a transmission request for the anticorrosion information to the two-way communication means upon reception of the power supply abnormality notification information.

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