JP5269539B2 - Abnormal operation detection method and abnormal operation detection system for selective drain - Google Patents

Description

  The present invention relates to an abnormal operation detection method and an abnormal operation detection system for a selective drain.

  A current that flows out from the rail to the ground during operation of the DC electric railway vehicle (referred to as a rail leakage current) may flow into the metal pipeline buried under the rail of the DC electric railway vehicle. If it flows through the part where the ground resistance is low, DC stray current corrosion will occur there. One of the methods for preventing the DC stray current corrosion due to the leakage of the rail leakage current is a selective drainage method. The metal pipeline here includes a gas conduit, a water pipe, a communication wiring protection pipe, and the like, and includes both those that are cathodic-proofed and those that are not cathodic-proofed.

  As shown in FIG. 1, the selective drainage method uses a rail-to-ground potential (rail R and ground S) with respect to the pipe-to-ground potential P / S of the buried metal pipeline P (potential difference between the buried metal pipeline P and the ground S). When the potential difference between the buried metal pipeline P and the rail R (or the lead-in wire from the rail to the substation) is electrically connected via the selective drain 1, the buried metal pipeline P flows. In this method, the current is returned to the rail R in a lump without directly flowing the current to the ground (see Non-Patent Document 1). In the figure, D1 represents a DC electric railway vehicle, D2 represents a train line, and D3 represents a substation. The selective drainage method uses the phenomenon that current is sucked up by the rail R in the vicinity of the substation D3 and where braking of the regenerative braking vehicle is frequently performed. By connecting the buried metal pipeline P and the rail R with electric wires and allowing only the current from the buried metal pipeline P to the rail R, the current flowing out from the buried metal pipeline P to the ground is reduced. is there.

As the selective drainer 1, a silicon diode and a resistor connected in series are generally used, and the cathode side of the silicon diode is connected to a buried metal pipeline P to be protected against corrosion. The maintenance check of the selective exhaust device 1 is usually performed by a periodic inspection performed about once a year, and the electrical characteristics of the selective exhaust device 1 are confirmed.
The Institute of Electrical Engineers, Electrochemical Corrosion Prevention Research Committee, “New edition of Electric Corrosion / Soil Corrosion Handbook” published by the Institute of Electrical Engineers, May 1977, p. 239

  Since the selective drainer is connected to the rail, it is usually installed in the railway site. To perform maintenance and inspection of this selective drainer, the railway administrator's permission to enter the railway site is required. I need it. Therefore, when there is a concern about lightning strikes on the selective drain, there is a situation where it is impossible to promptly check and confirm. Lightning strikes are increasing in urban areas due to abnormal weather, which has been regarded as a problem in recent years, but since lightning strikes are likely to occur on grounded conductive facilities, lightning falls on grounded rails and selective drainers. There are concerns about the frequent occurrence of accidents.

  The breakdown of the selective drainage device due to lightning strikes, etc., can be considered dielectric breakdown and conduction breakdown. When a dielectric breakdown occurs in the selective drain, the selective drain is originally generated in a place where current is sucked up from the ground to the rail, such as near a substation or where braking of a regenerative braking vehicle is likely to occur. Since the vessel is connected, current flowing out from the buried metal pipeline to the ground is increased in the vicinity thereof, and a fatal defect may occur in the buried metal pipeline in a short period of time. In addition, when continuity breakdown occurs in the selective drain, current is actively introduced from the rail into the buried metal pipeline when the DC electric railway vehicle passes over the connection point of the selective drain. As a result, the risk of corrosion at the location where the flowed-in current flows out increases.

  As described above, the failure of the selective drainage device is detected when the selective drainage device is installed in the electric railway site, although it is necessary to detect it early and immediately replace it with a new selective drainage device. Under certain circumstances, early detection of damage was difficult. In order to cope with this, it is conceivable to remotely monitor the operation state of the selective exhaust, but the current flowing through the selective exhaust changes frequently depending on the operation status of the DC railway vehicle, Since there is a measurement drift due to the temperature change, there is a problem that it is not possible to clearly grasp the damage by remote monitoring of the exhaust current, except when the reverse current phenomenon of the exhaust current can be surely confirmed.

  The present invention has been proposed in order to deal with such a situation, and is capable of promptly detecting an abnormal operation of the selective drainage device and performing an immediate replacement operation. It is an object of the present invention to be able to properly notify the abnormal operation of the flow device, to remotely monitor the abnormal operation of the selective drainage device without entering or leaving the railway site.

  In order to achieve such an object, the present invention provides, in part, an abnormal operation of a selective drain connected between a rail of a DC electric railway and a buried metal pipeline buried under the rail. And a drain current flowing from the buried metal pipeline to the rail via the selective drain, and at a connection point between the selective drain and the buried metal pipeline. A monitoring step for monitoring the tube-to-ground potential, and the selective discharge when the discharge current is negative or when the discharge current is positive or zero and the tube-to-ground potential is more positive than the anticorrosion reference potential. A selective exhaust device abnormality determining step for determining that there is an abnormality in the flow device, and an abnormality notification step for notifying the abnormality when determined to be abnormal in the selective exhaust device abnormality determining step, Do

  One is a system for detecting abnormal operation of a selective drain connected between a rail of a DC electric railway and a buried metal pipeline buried under the rail, the buried metal pipeline A drain current monitoring means for monitoring a drain current flowing in the rail through the selective drain from the pipe, and a tube ground for monitoring a pipe ground potential at a connection point between the selective drain and the buried metal pipeline When the drainage current is negative or when the drainage current is positive or zero and the tube-to-ground potential is more positive than the anticorrosion reference potential, there is an abnormality in the selective drainer And a selective drainage abnormality judging means for judging that the selective drainage abnormality judging means judges that there is an abnormality in the selective drainage abnormality judging means. To.

  According to such a feature, the exhaust current flowing from the buried metal pipeline to the rail through the selective drain is monitored, and the pipe ground potential is monitored at the connection point between the selective drain and the buried metal pipeline. Therefore, it is possible to objectively detect the abnormal operation of the selective exhaust device based on not only the monitor value of the exhaust current that frequently fluctuates but also the change in the anticorrosion status of the pipeline. Thereby, it is possible to notify abnormal operation detection information with high reliability.

  Further, when the monitored exhaust current is negative, or when the exhaust current is positive or zero and the pipe-to-ground potential is more positive than the anticorrosion reference potential, it is determined that there is an abnormality in the selective exhaust device. When the discharge current is zero and the pipe-to-ground potential is more positive than the anticorrosion reference potential, it is possible to detect the dielectric breakdown of the selective drain, and when the drain current is negative, the selective breakdown can be detected. . This makes it possible to appropriately determine various abnormalities of the selective drainage device.

  Furthermore, by notifying the abnormal determination result of the selective exhaust device described above, for example, the abnormal state of the selective exhaust device can be grasped remotely, so that even if it does not enter the electric railway site, it can be detected early. Abnormality can be detected and appropriate countermeasures can be taken.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 2 is an explanatory diagram (process flow) illustrating a method for detecting abnormal operation of a selective drain according to an embodiment of the present invention. The method for detecting abnormal operation of a selective drain according to the embodiment of the present invention includes, as main processes, a monitoring process S1, a selective exhaust apparatus abnormality determination process S2, and an abnormality notification process S3. An abnormal operation of a selective drain connected between a rail of a DC electric railway and a buried metal pipeline buried under the rail is detected.

  The monitoring step S1 monitors the drain current I flowing from the buried metal pipeline to the rail via the selective drain, and also calculates the pipe-to-ground potential P / S at the connection point between the selective drain and the buried metal pipeline. This is a monitoring process. This is always performed after the start of abnormality detection of the selective exhaust device, and the exhaust current I and the pipe ground potential P / S are monitored for 24 hours, and the monitored values are determined in the selective exhaust device abnormality determination step S2. It is processed.

In the selective drainage abnormality determination step S2, the monitored drain current I is negative, or the monitored drain current I is positive or zero, and the monitored tube ground potential P / S is the anticorrosion standard. This is a step of determining that there is an abnormality in the selective drain when the potential is more positive than the potential. According to this, in addition to determining whether the monitored exhaust current I is positive, zero, or negative, the pipe-to-ground potential P / S of the buried metal pipeline is set to a value greater than the anticorrosion reference potential. Therefore, it is determined whether or not the value is inappropriate in the anticorrosion management, and the abnormal operation of the selective drainage device is determined. The anticorrosion reference potential here is a natural corrosion potential (for example, −500 mV _{CSE on the} basis of saturated copper sulfate electrode (CSE)) when the target buried metal pipeline is not cathodic protected, and the target embedded metal In the case where the pipeline is cathodic-proofed, the anticorrosion control standard value (for example, −1000 mV _CSE ) serving as the base is used.

  The abnormality notification step S3 is a step of notifying the abnormality when it is determined that there is an abnormality in the selective drainage device abnormality determination step S2. This process includes not only a remote data transmission process described later but also various notifications by sound generation, light emission display, and the like.

  Since the method for detecting abnormal operation of the selective drain according to the embodiment of the present invention having such steps as described above always monitors the drain current I and the pipe-to-ground potential P / S, the selective drain When deviating from the proper operation, this abnormal operation can be immediately detected and notified. As a result, it becomes possible to detect insulation breakdown and conduction breakdown of the selective drainage at an early stage and quickly respond to such abnormal situations. In addition, any of the dielectric breakdown or continuity breakdown of the selective drain can be determined to be abnormal and promptly notified. Furthermore, by performing this notification remotely, even in a selective drainer installed in a railway site that requires entry permission, the abnormal operation of the selective drainer is recognized without entering the railway site. It becomes possible to cope with this.

  FIG. 3 is an explanatory diagram (process flow) showing a more specific embodiment of the method for detecting abnormal operation of a selective drain according to the embodiment of the present invention. In this embodiment, it has an analog processing step S10 for executing the above-described monitoring step S1 and a selective drainage device abnormality determining step S2, and a digital processing step S20 for executing the above-described abnormality notification step S3. Yes.

  The analog processing step S10 is a continuous monitoring of the exhaust current I and the pipe ground potential P / S, a comparison process for comparing the monitored exhaust current I and the pipe ground potential P / S with a threshold value, and the comparison process described above. It includes an alarm generation process for generating an alarm when an abnormality is determined as a result. The analog processing step S10 is performed by arithmetic processing of an analog circuit. By performing the monitoring process S1 and the selective drainage abnormality determination process S2 that are always performed with an analog circuit, power consumption can be suppressed, and continuous execution of a period in which periodic inspection is performed with a small power source such as a dry battery is possible. Become.

  On the other hand, the digital processing step S20 is executed by processing of a digital arithmetic processing means (CPU or the like), and may be started by an alarm generation in the analog processing step S10 described above or by its own timer interrupt.

An example of the analog processing step S10 will be described with reference to FIG. 3. From the start of abnormality detection, the monitoring of the exhaust current I (S11) and the monitoring of the pipe-to-ground potential P / S (S12) are always performed, and there is no timer interruption ( S13) If no alarm is triggered (S14), the monitored exhaust current I is compared with a threshold value (zero). If the exhaust current I is negative (S15: “NO”). An alarm is triggered (S17). When the monitored exhaust current I is zero or positive (S15: “YES”), the tube ground potential P / S is compared with a threshold value (corrosion protection reference potential E ₀ ), and the tube ground potential is compared. If P / S is greater (than plus than anticorrosion reference potential E ₀₎ than the threshold value (S16: "YES") to trigger the alarm also it is applied (S17). When the monitored exhaust current I is zero or positive (S15: “YES”), and the pipe ground potential P / S is equal to or lower than the threshold value (corrosion protection reference potential E ₀ or lower) (S16: “NO”). ), The above-mentioned monitoring is continued (monitor continuation: S18).

In the selective drainage abnormality determination step S2, when the exhaust current I> 0, no backflow of the exhaust current has occurred, but whether the selective exhaust has been operating normally or is broken in conduction. It is unknown by itself. In this case, the pipe ground potential P / S of the target buried metal pipeline is compared with the anticorrosion reference potential E _0, and whether or not the pipe ground potential P / S is more positive than the anticorrosion reference potential E _0. Judge by. If the pipe-to-ground potential P / S is more positive than the anticorrosion reference potential E ₀ , it can be determined that the drainage effect is not sufficient even if the selective drainer itself is operating normally. Judge that there is an abnormality.

Further, in the case of the exhaust current I = 0, if the rail leakage current does not flow into the buried metal pipeline, I = 0, so that it is not possible to determine whether the current is abnormal or normal. If the tube-to-ground potential P / S is equal to or lower than the anti-corrosion reference potential E ₀ , it is determined that there is no exhaust current I itself and the monitoring is continued, and the tube-to-ground potential P / S is greater than the anti-corrosion reference potential E _0. It is judged that an abnormality occurred due to dielectric breakdown.

  In the case of the exhaust current I <0, the reverse current phenomenon of the exhaust current is detected. When the selective drainage diode is broken due to a lightning strike, etc., if the tube-to-ground potential P / S at the discharge point becomes negative than the rail-to-ground potential R / S, it is buried from the rail regardless of the value of P / S. Current flows through the metal pipeline, and corrosion occurs where this current is released to the ground. The reverse flow of the exhaust current I is quickly detected by comparing the exhaust current I with a threshold value (zero), and is determined to be abnormal.

  When a trigger is activated by the occurrence of an alarm (S17), the digital processing step S20 for executing the abnormality notification step S3 is started. When an alarm is triggered, when the digital processing step S20 is executed and then the processing returns to the analog processing step S10, the exhaust current I monitoring step S11 and the pipe-to-ground potential P / S monitoring step S12 are performed. Step S14 becomes “YES”, and the measurement data calculation process in the digital processing step S20 is performed by the monitored exhaust current I and the pipe-to-ground potential P / S.

  A specific feature of the abnormality notification step S3 is that, in part, the abnormality detection information is transmitted to a preset remote monitoring destination to notify the abnormality of the selective drainer, and in part, the selection is made. A data storage step S23 for storing the measurement data of the drain current I and the pipe-to-ground potential P / S for a set measurement time after it is determined that there is an abnormality in the exhaust device abnormality determination step S2, and the stored measurement And a data transmission step S25 for transmitting data to a remote monitoring destination.

  According to this, by sending anomaly detection information to a preset remote monitoring destination, even if a selective drainage device is installed in a place where authorization is required such as a railway site, it can be selectively discharged without entering it. It is possible to detect the abnormality of the fluency. Also, by sending the measurement data of the exhaust current I and the pipe-to-ground potential P / S to the remote monitoring destination as abnormality detection information, the measurement data is analyzed at the remote monitoring destination and the specific contents of the abnormality are grasped. And measures against it can be examined. Analyzing the stored data even at the site where the selective drainer is installed, and examining the correspondence by temporarily storing the data before sending the measurement data of the drain current I and the pipe-to-ground potential P / S Is possible.

  The digital processing step S20 in which the abnormality notification step S3 is executed will be described more specifically with reference to FIG. First, the arithmetic processing means (CPU) is activated by an alarm generation (S17) trigger (S21). The arithmetic processing means is normally in a dormant state (sleep state) and changes from a dormant state to an activated state (wake-up state) upon receiving an alarm (S17) in the analog processing step S10. The activated arithmetic processing means samples the monitored exhaust current I and the pipe-to-ground potential P / S, performs measurement / calculation processing, and generates measurement data (measurement / calculation processing step S22).

  The measurement data generated in the measurement / arithmetic processing step S22 is saved as needed in the data storage means in the arithmetic processing means (data saving step S23). The sampling, measurement / calculation processing step S22, and data storage step S23 of the drain current I and the pipe ground potential P / S are repeatedly executed until the measurement time set by the calculation processing means ends (S24: “NO”). ) When the set measurement time ends (S24: “YES”), data transmission is performed (data transmission step S25).

  In the embodiment shown in FIG. 3, the sampling, measurement / calculation processing step S22 and data storage step S23 of the exhaust current I and the pipe-to-ground potential P / S are performed not only when an alarm is triggered, but also by a timer interrupt. Is also done. That is, not only when the selective drain is abnormal, but also during normal times, for example, once a day, etc., periodically, for example, by the sampling of the measured current I and the pipe-to-ground potential P / S and the measurement calculation process. The measured data is stored, and the stored measurement data is transmitted to a preset remote monitoring destination.

  This operation is executed by a timer interrupt in the digital processing circuit. Steps S21 to S23 in the digital processing step S20 are executed by a timer interrupt that operates periodically, and steps S11 to S23 are repeatedly executed until the set measurement time has elapsed (S24: “NO”, S13: “YES”). "), After the set time has elapsed (S24:" YES "), data is transmitted (S25).

FIG. 4 is an explanatory diagram showing a specific example of the measurement / calculation processing step S22. In the illustrated example, if a timer interrupt is started at time hh: mm: 0 (S13: “YES”) or an alarm is triggered (S17), then a measurement time of 10 minutes is set. Until the end of the measurement time (S24: “NO”), the monitoring of the discharge current I (S11) and the monitoring of the pipe-to-ground potential P / S (S12) are performed simultaneously, and 1/2 ⁸ s. The measurement / calculation process step S22 is performed every 1 s at the sampling interval. In the measurement / calculation processing step S22, average values (I ^ave and (P / S) ^ave ) in units of 1 s are obtained from 250 sampling values obtained during 1 s.

First, an average value (I ^ave ) ₁ of the discharge current I and an average value (P / S) ^ave ₁ of the pipe-to-ground potential P / S during 1 s from time hh: mm: 0 to time hh: mm: 01 This is obtained and temporarily stored in the data storage step S23. Then, the average value (I ^ave ) ₂ of the discharge current I and the average value (P / S) ^{ave of the} pipe-to-ground potential P / S during 1 s from the next time hh: mm: 01 to the time hh: mm: 02 ₂ are ^compared with (I ^ave ) ₁ and (P / S) ^ave _1, and the larger one is the maximum value I _max , (P / S) _max , and the smaller one is the minimum value I _min , (P / S) As _min , these are temporarily stored in the data storage step S23.

Such a process is repeated, and I _ave , I _max , I _min and (P / S) _ave , (P / S) _max , (between time hh: mm: 0 and time hh: (mm + 1): 0 P / S) _{Find min} . Eventually, I _ave , I _max , I _min and (P / S) _ave , (P / S) _max , (P / S) from time hh: mm: 0 to time hh: (m + 10): 0 _Min is obtained, and these are stored in the data storage step S23. At that time, the maximum value and the minimum value are stored together with the appearance time. Here, I _ave , I _max , and I _min indicate the average value, maximum value, and minimum value of the exhaust current I, and (P / S) _ave , (P / S) _max , (P / S) _min Indicates the average value, maximum value, and minimum value of the tube-to-ground potential P / S.

  Here, the set time hh: mm: 0 in the timer interruption is preferably performed at the time of rush hour of the DC electric railway vehicle (for example, around 8:00 am). Since the occurrence of rail leakage current is considered to be large during rush hour when the operation of the DC electric railway vehicle is frequently performed, changes in the exhaust current I and the pipe-to-ground potential P / S can be recognized remarkably. The set measurement time may be a time when the influence of the DC electric railway operation can be grasped, but as an example, 10 minutes can be adopted as described above.

  In the data transmission step S25, the measurement data stored as described above is transmitted to the remote monitoring destination using various communication means. As an example of this process, a wireless remote line connects to a center server set on a network line such as the Internet, and data is transmitted to the receiving means of the center server (S25).

  After that, when no alarm is generated (S26: "NO"), that is, in the case of timer interruption, the arithmetic processing means (CPU) is suspended and the process proceeds to the monitor continuation S18 of the analog processing step S10 again. Further, when an alarm is generated (S26: "YES"), for example, the connection with the center server is maintained and an instruction from the center server is awaited (center server instruction waiting step S28).

  FIG. 5 is an explanatory diagram showing an abnormal operation detection system for a selective drain according to an embodiment of the present invention. This system is a system for executing the above-described method for detecting abnormal operation of a selective drain. A selective drainer 1 is connected between the rail R of the DC electric railway D1 and the buried metal pipeline P buried under the rail R. The selective drainer 1 has a shunt resistor 11 connected in series to a diode 10 and is selected between electric wires L1 and L2 to which the connection point P1 between the selective drainer 1 and the buried metal pipeline P and the rail R are connected. A drain 1 is connected.

A voltmeter 12 is connected in parallel on both sides of the shunt resistor 11, and the voltage across the shunt resistor 11 is constantly measured by the voltmeter 12. Exhaust current monitoring means for monitoring the exhaust current I flowing from the buried metal pipeline P to the rail R through the selective exhaust device 1 by an arithmetic circuit that divides the voltage V between both ends by the resistance value R _S of the shunt resistor 11. 13 is configured.

  In addition, a voltmeter 15 that constantly measures the tube-to-ground potential P / S is connected between the electric wires L3 and L4 that connect the connection point P1 and the reference electrode 14 installed on the ground. Thus, a pipe-to-ground potential monitoring means (voltmeter 15) for monitoring the pipe-to-ground potential P / S at the connection point P1 between the selective drain 1 and the buried metal pipeline P is configured. Here, a metal electrode (zinc electrode, magnesium electrode, etc.) is used as the reference electrode 14 in order to constantly measure the tube-to-ground potential P / S.

The exhaust current monitoring means 13 and the pipe-to-ground potential monitoring means (voltmeter 15) are connected to the selective exhaust current abnormality determining means 16 and the exhaust current I monitored by the selective exhaust current abnormality determining means 16 and The tube-to-ground potential P / S is always input. The selective drainage abnormality determination means 16 is used when the drain current I is negative or when the drain current I is positive or zero and the tube-to-ground potential P / S is more positive than the anticorrosion reference potential E _0. Therefore, it is determined that there is an abnormality in the selective drainage device 1. This selective drainage abnormality determining means 16 can be constituted by an analog arithmetic processing circuit, and a comparison circuit for comparing the drain current I and a threshold value (zero), a pipe-to-ground potential P / S, and a threshold value (corrosion prevention standard). It can be configured by a combination of comparison circuits for comparing the potential E ₀ ).

  The exhaust current monitoring means 13 and the pipe-to-ground potential monitoring means (voltmeter 15) execute the above-described monitoring step S1, and the selective exhaust device abnormality determining means 16 performs the above selective exhaust device abnormality determining step S2. It is something to execute.

  And the abnormality alerting means 17 which alert | reports the abnormality of the selective exhaust device 1 is provided when the selective exhauster abnormality determining means 16 determines that there is an abnormality. The abnormality notification unit 17 executes the above-described abnormality notification step S3, and can be configured by an electronic device provided with a digital arithmetic processing unit (CPU).

  The abnormality notifying means 17 includes information transmitting means for transmitting abnormality detection information to a preset remote monitoring destination. More specifically, the abnormality notifying means 17 is connected to the center server 20 set on the network line 2 such as the Internet when abnormality is detected, and transmits abnormality detection information to the center server 20. The abnormality detection information is accumulated in the center server 20, and the abnormality detection information is transmitted from the center server 20 via the network line 2 to the remote monitoring destination information terminals 3 and 4 connected to the center server. As the information terminals 3 and 4, a mobile phone or a portable information terminal that can be connected to the network line 2 can be used.

  FIG. 6 is an explanatory diagram showing a specific functional configuration example of the abnormality notifying unit 17. The abnormality notifying unit 17 includes a data sampling unit 17A, a measurement / arithmetic processing unit 17B, a data storage unit 17C, a data transmission unit 17D, a measurement time counting unit 17E and the like as necessary. Furthermore, a timer interrupt means 17F is provided as necessary in order to periodically transmit data not only when an abnormality is detected but also during normal times.

The data sampling means 17A is a means for sampling the monitored drain current I and the tube-to-ground potential P / S at a set sampling interval (for example, 1/2 ⁸ s). The measurement / calculation processing means 17B is a means for executing the above-described measurement / calculation processing step S22 on the drain current I and the pipe-to-ground potential P / S sampled by the data sampling means 17A. For example, when the process shown in FIG. 4 is executed, I _ave , I _max , I _min and (P / S) _ave , (P / S) _max , (P / S) _min within the measurement time are Desired.

The data storage unit 17C is a unit that stores the calculation processing result of the measurement / calculation processing unit 17B in the storage unit. When the process shown in FIG. 4 is executed, I _ave , I _max , I _min and (P / S) _ave , (P / S) _max , (P / S) _min obtained within the measurement time are In addition to data storage, the appearance time of I _max and I _min and (P / S) _max and (P / S) _min is stored.

The data transmission unit 17D selectively saves measurement data such as I _ave , I _max , I _min and (P / S) _ave , (P / S) _max , (P / S) _min stored in the data storage unit 17C. It is means for transmitting data to the remote monitoring destination together with the specific information of the fluency device 1. Here, the specific information of the selective drainage 1 is data measured for any one of the selective drainage pipes 1 installed in a plurality of buried metal pipelines P or a plurality of buried metal pipelines P. For example, in the above-described center server 20, the selective drainer in which the measurement data sent is installed at which location of which buried metal pipeline by this identification information. It is possible to identify whether it is 1 measurement data. A specific example of the data transmission means 17D is a communication connection with the above-described center server 20 at the time of data transmission, and I _ave , I _max , I _min and (P / S) _ave , (P / Measurement data such as S) _max and (P / S) _min and the specific information of the selective drain 1 are transmitted to the center server 20 as abnormality detection information.

  The measurement time counting means 17E is a function for controlling the operation of the abnormality notification means 17 while measuring the set measurement time. The abnormality notification means 17 has a power supply individually, but in order to suppress power consumption and ensure a power supply life, it is preferable to have a system configuration in which the system is always inactive and activated only when necessary. The time measuring means 17E has a function of measuring the measurement time set after the abnormality notifying means 17 is activated, and setting the abnormality notifying means 17 to the sleep state again after the measurement time has elapsed.

  The timer interrupt means 17F is a function for causing the abnormality notifying means 17 to periodically operate the digital arithmetic processing means not only at the time of abnormality but also at normal times. Start. After the activation, when the measurement time elapses due to the function of the measurement time counting means 17E, the operation again enters the resting state.

  The abnormality notifying unit 17 can be configured by a program that executes the digital arithmetic processing unit. As shown in FIG. 6, the abnormality notifying means 17 as the main program causes the data sampling means 17A, the measurement / arithmetic processing means 17B, the data storage means 17C, the data transmission means 17D, the measurement time counting means 17E, and the timer as subprograms. Each function of the interrupt means 17F is executed.

  FIG. 7 is an explanatory diagram showing a configuration example of the center server 20. The center server 20 set on the network line includes data receiving means 21 for receiving the measurement data and specific information transmitted from the data transmitting means 17D of the abnormality information notifying means 17, and the received measurement data based on the specific information. Database construction means 22 for constructing the database 22A by storing for each individual selected drainer, information terminal management means 23 for managing information terminals connectable to the center server 20 via the network line 2, and information terminal management An information terminal connection unit 24 that outputs data constructed in the database 22A to the information terminal 3 managed by the unit and connected to the center server 20 is provided.

  The data transmission unit 17D and the data reception unit 21 of the abnormality information notification unit 17 are connected by communication using a radio telephone line or the like, and the center server 20 receives the signal from the data reception unit 21 and operates thereafter. To start. When the data receiving means 21 receives the measurement data and the specific information, the database construction means 22 selects, based on the received specific information, the selected drainage device 1 where the sent measurement data is installed in which buried metal pipeline. The database 22A is constructed for each individual selective drainer 1. Since the database 22A stores measurement data during normal times and abnormal times, all remote monitoring information of the selective drainage device 1 is stored.

  For example, the information terminal management unit 23 determines whether the information terminal 3 is an information terminal that can access the center server 20 based on the identification information sent from the information terminal 3 via the network line 2. To do. When the information terminal management means 23 grants access to the center server 20, the information terminal 3 can be connected to the database 22A via the information terminal connection means 24, and information can be obtained based on a request from the information terminal 3. The terminal connection means 24 can output the data constructed in the database 22A to the information terminal 3. That is, according to the information terminal 3 as described above, the remote monitoring information of the selective drainage device 1 can be acquired anytime and anywhere as long as it can be connected to the network line 2.

  Further, the center server 20 is managed by the information terminal management means 23 and sends an abnormality detection information to the information terminal 3 connected to the center server 20 when the data reception means 21 receives the abnormality detection mail. A transmission means 25 is provided. The abnormality detection mail transmission means 25 determines whether or not the measurement data and specific information sent to the data reception means 21 are those at the time of occurrence of an alarm. Recognizing that the measurement data is received by detecting the abnormal operation of the drainage device 1, the abnormality detection information is transmitted to the information terminal 3 by e-mail. According to this, it becomes possible to notify the information terminal 3 at the remote monitoring destination of the occurrence of the abnormality of the selective drainage device 1 at an early stage.

It is explanatory drawing of the selective drainage method. It is explanatory drawing (process flow) which shows the abnormal operation detection method of the selective exhaust device which concerns on embodiment of this invention. It is explanatory drawing (process flow) which showed further more concrete embodiment of the abnormal operation detection method of the selective drainer which concerns on embodiment of this invention. It is explanatory drawing which showed the specific example of the measurement and arithmetic processing process in the abnormal operation detection method of the selective drainer which concerns on embodiment of this invention. It is explanatory drawing which shows the abnormal operation detection system of the selective drainage which concerns on embodiment of this invention. It is explanatory drawing which showed the specific structural example of the abnormality alerting | reporting means in the abnormal operation detection system of the selective exhaust device which concerns on embodiment of this invention. It is explanatory drawing which showed the example of a structure of the center server in the abnormal operation detection system of the selective drainage which concerns on embodiment of this invention.

Explanation of symbols

1: selective drain, 2: network line, 3, 4: information terminal,
10: Diode, 11: Shunt resistor, 12, 15: Voltmeter,
13: Exhaust current monitoring means, 14: Reference electrode,
16: Selective drainage abnormality judging means,
17: Abnormality notification means,
17A: data sampling means, 17B: measurement / calculation processing means,
17C: Data storage means, 17D: Data transmission means,
17E: Measurement time counting means, 17F: Timer interruption means,
20: Center server,
21: Data receiving means, 22: Database construction means, 22A: Database,
23: Information terminal management means, 24: Information terminal connection means,
P: buried metal pipeline, P1: connection point,
R: Rail, D1: DC electric railway vehicle, L1-L4: Electric wire

Claims (8)

A method for detecting an abnormal operation of a selective drain connected between a rail of a DC electric railway and a buried metal pipeline buried under the rail,
A monitoring step of monitoring a drain current flowing from the buried metal pipeline through the selective drain to the rail and monitoring a pipe-to-ground potential at a connection point between the selective drain and the buried metal pipeline. When,
When the exhaust current is negative, or when the exhaust current is positive or zero and the pipe-to-ground potential is more positive than the anticorrosion reference potential, it is determined that the selective exhaust device is abnormal. Fluency abnormality determination process,
An abnormal operation detection method for a selective exhaust device, comprising: an abnormality notification step for notifying the abnormality when it is determined in the selective exhaust device abnormality determination step that there is an abnormality.   The abnormality of the selective exhaust device according to claim 1, wherein the abnormality notification step notifies the abnormality of the selective exhaust device by transmitting abnormality detection information to a preset remote monitoring destination. Motion detection method.   The abnormality notification step is a data storage step of storing data of measurement data of the exhaust current and the pipe-to-ground potential for a set measurement time after it is determined that there is an abnormality in the selective exhaust device abnormality determination step; The method according to claim 1, further comprising a data transmission step of transmitting the stored measurement data to a remote monitoring destination. A system for detecting an abnormal operation of a selective drain connected between a rail of a DC electric railway and a buried metal pipeline buried under the rail,
A drain current monitoring means for monitoring a drain current flowing from the buried metal pipeline to the rail via the selective drain;
A pipe-to-ground potential monitoring means for monitoring a pipe-to-ground potential at a connection point between the selective drain and the buried metal pipeline;
When the exhaust current is negative, or when the exhaust current is positive or zero and the pipe-to-ground potential is more positive than the anticorrosion reference potential, it is determined that the selective exhaust device is abnormal. Fluency abnormality judging means,
An abnormal operation detection system for a selective exhaust device, comprising: an abnormality notification means for notifying the abnormality of the selective exhaust device when the selective exhaust device abnormality determining means determines that there is an abnormality.   5. The abnormal operation detection system for a selective drain according to claim 4, wherein the abnormality notification means includes means for transmitting abnormality detection information to a preset remote monitoring destination.   The abnormality notifying unit is a data storage unit that stores the measurement data of the drain current and the tube-to-ground potential for a set measurement time after the selection exhauster abnormality determination unit determines that there is an abnormality, 6. The abnormal operation detection system for a selective exhaust device according to claim 4, further comprising: a data transmission unit configured to transmit the measured data that has been measured together with the specific information of the selective exhaust device to a remote monitoring destination. . It has a center server set on the network line,
The center server
Data receiving means for receiving the measurement data and the specific information transmitted from the data transmitting means;
A database construction means for constructing a database by storing the received measurement data for each individual selective drainer based on the specific information;
Information terminal management means for managing information terminals connectable to the center server via a network line;
7. An information terminal connection means for outputting data constructed in the database to an information terminal managed by the information terminal management means and connected to the center server. The system for detecting abnormal operation of the described selective drain. The center server is
It comprises an abnormality detection mail transmission means for sending abnormality detection information by e-mail to the information terminal managed by the information terminal management means and connected to the center server upon reception of the data reception means, The abnormal operation detection system for a selective drainer according to claim 7.

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