Failure detection device of cathode protection sensor

Abstract

A failure detection device of a cathode protection sensor comprises a monitoring terminal, a monitoring sensor, a polarized wire, a reference block and a test ampere meter, the reference block is buried underground and electrically connected with the polarized wire, a main switch is closed, and the reference block and a monitoring block are both electrically connected with a protected pipeline; and the test ampere meter is arranged on the polarized wire and is positioned between the electrical connection point of the reference test piece and the electrical connection point of the monitoring test piece, and the test ampere meter judges whether the monitoring test piece fails or not according to the current reading of the test ampere meter when the main circuit switch is switched off. According to the embodiment of the utility model, the comparison test piece is arranged, so that whether the monitoring test piece fails or not is judged by testing whether the current reading on the ammeter flows from the monitoring test piece to the comparison test piece and exceeds a threshold value or not when the polarization connection of the two is disconnected, and remote monitoring of whether the cathode protection monitoring sensor fails or not can be realized; in addition, reference electrode failure and test piece failure can be accurately distinguished, and the monitoring difficulty and workload are reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of cathodic protection anticorrosion technology, especially relates to a failure detection device of cathodic protection sensor. BACKGROUND

[0002] In order to carry out real-time monitoring to the state of cathodic protection, the cathodic protection monitoring device carries out monitoring to the potential state of the protected pipeline through its sensor, and the sensor generally comprises a test piece and a long-acting reference electrode, the test piece is made of the same or similar material as the material of the protected pipeline, and is generally carbon steel material.The long-acting reference electrode for buried cathodic protection is generally a saturated copper sulfate reference electrode, which is composed of a copper rod / silk in the middle and surrounding saturated copper sulfate.

[0003] In actual use, the long-acting copper sulfate reference electrode exchanges ions with the external electrolyte (such as soil, water, etc.) through low-permeability materials (such as ceramic, cork, etc.) to realize potential measurement.In addition, the test piece and the long-acting reference electrode are as close as possible to use, so as to reduce the IR drop error introduced in the process of measuring potential.Due to the long-term burying of the sensor in the wild, once the long-acting copper sulfate reference electrode fails or the test piece fails, it will cause error in the measurement of potential, so that the monitoring device cannot represent the actual cathodic protection effect, and the potentiostat outputs and adjusts according to the wrong potential, resulting in abnormal cathodic protection state of the protected pipeline.

[0004] The failure of the long-acting reference electrode is mainly due to the excessive loss of internal copper sulfate, which leads to unsaturation of the copper sulfate solution or suspension of the internal copper rod (cannot contact with the saturated copper sulfate solution), resulting in positive potential measurement error.The main reason for the failure of the test piece is that the copper flowing out of the test piece and the reference electrode causes displacement reaction, resulting in copper (or its oxide) covering the surface of the test piece, and further causing abnormal potential of the test piece or premature failure (copper ion pollution).

[0005] At present, the judgment of sensor failure anomaly is mainly through manual judgment of uploaded potential data, and it is often difficult to directly distinguish the failure of the reference electrode and the failure of the test piece through the data, so that only manual on-site monitoring of the sensor can be carried out, the sensor is laid in the wild, and on-site monitoring is more difficult, which increases the work burden of the management personnel. UTILITY MODEL CONTENTS

[0006] In view of the deficiencies in the related art, the utility model provides a failure detection device of cathodic protection sensor to solve the problems that current cathodic protection monitoring sensor failure monitoring needs manual judgment and cannot be distinguished.

[0007] The utility model provides a failure detection device of cathodic protection sensor, comprising:

[0008] The monitoring terminal has a monitoring voltmeter and a main switch.

[0009] The monitoring sensor is buried underground and has a monitoring test piece and a monitoring reference electrode, and a monitoring voltmeter is electrically connected to the monitoring test piece and the monitoring reference electrode, respectively;

[0010] The polarization conductor is electrically connected to the protected pipeline buried underground, the monitoring test piece is electrically connected to the polarization conductor, and a main circuit switch is arranged on the polarization conductor and located between the electrical connection point of the monitoring test piece and the protected pipeline;

[0011] The contrast test piece is buried underground and electrically connected to the polarization conductor, and the contrast test piece and the monitoring test piece are electrically connected to the protected pipeline by closing the main circuit switch.

[0012] The test ammeter is arranged on the polarization conductor and located between the electrical connection point of the contrast test piece and the electrical connection point of the monitoring test piece, and the test ammeter determines whether the monitoring test piece is invalid by the current reading when the main circuit switch is opened.

[0013] In some embodiments, a soil pipe is buried underground, and the monitoring test piece and the monitoring reference electrode are located in the soil pipe.

[0014] In some embodiments, a contrast reference electrode is further buried underground, and the monitoring terminal further has a test voltmeter, which is electrically connected to the contrast reference electrode and the monitoring reference electrode, respectively.

[0015] In some embodiments, the contrast reference electrode is a high-purity zinc reference electrode.

[0016] In some embodiments, the contrast reference electrode is located above the monitoring reference electrode.

[0017] In some embodiments, the positive electrode of the test ammeter is connected to the electrical connection point of the monitoring test piece, and the negative electrode of the test ammeter is connected to the electrical connection point of the contrast test piece.

[0018] In some embodiments, the contrast reference electrode, the monitoring test piece, and the monitoring reference electrode are located in the soil pipe buried underground.

[0019] In some embodiments, the contrast test piece is located on one side of the monitoring sensor in the horizontal direction.

[0020] In some embodiments, the distance between the contrast test piece and the monitoring test piece is greater than or equal to 0.5 m.

[0021] In some embodiments, a contrast circuit switch is arranged on the polarization conductor, and the contrast circuit switch is located between the electrical connection point of the contrast test piece and the electrical connection point of the monitoring test piece.

[0022] Compared with the prior art, the utility model discloses the beneficial effect lies in: the utility model discloses an embodiment through setting comparative test piece, connect it with monitor test piece to same line, make both connect the polarization of protected pipeline, thereby when disconnecting the polarization connection of both, whether the current reading that monitor test piece flows to comparative test piece and exceeds threshold value on test ammeter, thereby judge whether monitor test piece is invalid, can realize remote monitoring of whether invalid of cathodic protection monitoring sensor, and can distinguish reference electrode invalid and test piece invalid accurately, reduced the difficulty and work burden of monitoring, solved the problem that current cathodic protection monitoring sensor invalid monitoring needs manual judgment and cannot distinguish. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and serve to explain the utility model without limiting the utility model unnecessarily. In the drawings:

[0024] Figure 1 It is the structural schematic diagram of the invalid detection device of the cathodic protection sensor of the utility model;

[0025] In the drawings:

[0026] 1, monitoring terminal;2, monitoring sensor;21, monitor test piece;22, monitor reference electrode;3, polarization lead;4, comparative test piece;5, test ammeter;6, protected pipeline;7, monitoring voltmeter;8, main switch;9, soil pipe;10, comparative reference electrode;11, test voltmeter;12, comparative switch. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0028] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "center", "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.

[0029] The terms "first", "second", "third", are only used for descriptive purposes and should not be construed as indicating or implying relative importance or a specific number of the technical features indicated. Thus, the features defined with "first", "second", "third" can explicitly or implicitly include one or more of the features.

[0030] In the description of the utility model, it needs to explain, unless another explicit stipulation and limitation, the term "installation", "connection", "connect" should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be direct connection, also can be indirectly connected through the intermediate medium, can be two elements inside the intercommunication. For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to specific circumstances.

[0031] As Figure 1 As shown in one illustrative embodiment of the cathodic protection sensor failure detection device of the utility model, the cathodic protection sensor failure detection device includes monitoring terminal 1, monitoring sensor 2, polarization lead 3, comparison test piece 4 and test ammeter 5.

[0032] Monitoring terminal 1 is installed in the test pile adjacent to the protected pipeline 6, which has monitoring voltmeter 7 and main switch 8. Monitoring sensor 2 includes monitoring test piece 21 and monitoring reference electrode 22, both of which are buried underground, and monitoring voltmeter 7 is electrically connected with both of them respectively. Polarization lead 3 is electrically connected with the protected pipeline 6 buried underground, monitoring test piece 21 is electrically connected with polarization lead 3, and main switch 8 is installed on polarization lead 3 and located between the electrically connected point of monitoring test piece 21 on polarization lead 3 and the protected pipeline 6. Comparison test piece 4 is buried underground and electrically connected with polarization lead 3, and closing main switch 8 electrically connects comparison test piece 4 and monitoring test piece 21 with the protected pipeline 6. Test ammeter 5 is installed on polarization lead 3 and located between the electrically connected point of comparison test piece 4 on polarization lead 3 and the electrically connected point of monitoring test piece 21 on polarization lead 3.

[0033] Closing main switch 8, monitoring test piece 21 is electrically connected with the protected pipeline 6 through polarization lead 3, so that monitoring test piece 21 is polarized after a period of time, and the potential of monitoring test piece 21 is the same as that of the protected pipeline 6. Keeping main switch 8 closed, monitoring terminal 1 measures the voltage between monitoring reference electrode 22 and monitoring test piece 21 through monitoring voltmeter 7, so as to measure the energized potential of the protected pipeline 6. Opening main switch 8, so as to disconnect the electrical connection between test piece and the protected pipeline 6, at this time, monitoring terminal 1 measures the voltage between monitoring reference electrode 22 and monitoring test piece 21 through monitoring voltmeter again, so as to measure the de-energized potential of the protected pipeline 6.

[0034] When the copper sulfate in the monitoring reference electrode 22 is lost, the lost copper sulfate contacts the monitoring test piece 21. Since the monitoring test piece 21 is made of iron material, a displacement reaction occurs between the copper sulfate and the monitoring test piece 21, resulting in the surface of the test piece being covered with copper or its oxide, causing the monitoring test piece 21 to be contaminated with copper ions, resulting in the monitoring test piece 21 being disabled. Further, since the monitoring test piece 21 is disabled, the copper (or its oxide) which is more positive than the natural potential of iron is on the surface of the monitoring test piece 21, so that when the monitoring terminal 1 measures the potential of the monitoring test piece 21, the measured potential is more positive than the true potential on the protected pipeline 6, causing the potentiostat to output adjustment according to the potential measured by the monitoring terminal 1, which is easy to mistake the potential value on the protected pipeline 6 as being within the cathodic protection potential standard range, thereby increasing the output, adjusting the true potential on the protected pipeline 6 to the cathodic protection potential standard range, so that the protected pipeline 6 cannot be in the best cathodic protection state.

[0035] The comparative test piece 4 is far away from the monitoring reference electrode 22 and will not contact the lost copper sulfate, so it will not be disabled due to copper ion contamination. The comparative test piece 4 is electrically connected to the polarization lead 3, and the main switch 8 connects the polarization lead 3, so that the comparative test piece 4 and the monitoring test piece 21 are both electrically connected to the protected pipeline 6 through the polarization lead 3, so that after a period of time, both of them reach the same polarization state. Since the comparative test piece 4 and the monitoring test piece 21 are both electrically connected to the protected pipeline 6, the protected pipeline 6 receives cathodic protection, so that the comparative test piece 4 and the monitoring test piece 21 are also protected by cathodic protection and will not be corroded.

[0036] Disconnecting the main switch 8 simultaneously disconnects the electrical connection between the comparative test piece 4 and the monitoring test piece 21 and the protected pipeline 6. If the monitoring test piece 21 is disabled due to copper ion contamination, making its potential more positive than the true potential of the protected pipeline 6, while the comparative test piece 4 will not be contaminated by copper ions and will not be corroded and rusted, it will always be in an effective state. The potential on the comparative test piece 4 is accurate and the same as the true potential of the protected pipeline 6, resulting in a potential difference between the comparative test piece 4 and the monitoring test piece 21. Since the two are electrically connected through the polarization lead 3 at this time, the potential difference causes a current to flow between the two through the polarization lead 3, and this current can be detected by the test ammeter 5. If the monitoring test piece 21 is not disabled, the potential of the monitoring test piece 21 is similar to that of the comparative test piece 4, both being the true potential of the protected pipeline 6, and there is no or little potential difference between the two, so no current or a current close to 0 will flow between the two through the polarization lead 3, resulting in no current data being measured by the test ammeter 5 or the current reading being extremely small.

[0037] Therefore, after the main switch 8 is turned off, when the current reading on the test ammeter 5 is large, it can be determined that the monitoring test piece 21 is invalid; when the current reading on the test ammeter 5 is 0 or close to 0, it can be determined that the monitoring test piece 21 is normal. More specifically, by testing whether the current reading on the test ammeter 5 exceeds the set threshold, it is determined whether the value of the current reading is large or small, and then it is determined whether the monitoring test piece 21 is invalid or valid.

[0038] In addition, according to the connection of the test ammeter 5 and the positive and negative of the current reading, the current flow direction between the monitoring test piece 21 and the comparison test piece 4 is determined, so that when the current flow direction is from the monitoring test piece to the comparison test piece, the current reading exceeds the set threshold, and it is determined that the monitoring test piece 21 is invalid, ensuring the accuracy of the invalidity determination.

[0039] Further, after the operator manually determines that the sensor is invalid abnormally through the uploaded potential data, it is determined that the monitoring reference electrode 22 is invalid if the invalidity detection device determines that the monitoring test piece 21 is normal.

[0040] In order to further ensure the accuracy of the measurement, the monitoring test piece 21 and the comparison test piece 4 are made of the same material and have the same exposed area, and are buried in the same soil environment, so as to avoid the difference in exposed area, material and soil environment, which may cause potential difference between the two in the case of no invalidity.

[0041] In the above-mentioned exemplary embodiment, the invalidity detection device of the cathodic protection sensor connects the comparison test piece 4, which will not be invalid due to copper ion pollution, to the same polarization lead 3 as the monitoring test piece 21, so that both are connected to the protected pipeline 6 and polarized at the same time. When the polarization lead 3 is turned off and the polarization connection of both is turned off at the same time, it is determined by the test ammeter 5 whether there is a current reading flowing from the monitoring test piece to the comparison test piece and exceeding the threshold, so as to determine whether the monitoring test piece 21 is invalid, and then determine whether the monitoring reference electrode 22 is invalid according to whether the sensor is invalid abnormally obtained by uploading data manually. The remote monitoring of whether the cathodic protection monitoring sensor 2 is invalid can be realized, and the reference electrode invalidity and test piece invalidity can be accurately distinguished, which reduces the difficulty and workload of monitoring and solves the problem that the current invalidity monitoring of the cathodic protection monitoring sensor 2 needs manual judgment and cannot be distinguished.

[0042] In some embodiments, the soil pipe 9 is buried underground, and the monitoring test piece 21 and the monitoring reference electrode 22 are both located in the soil pipe 9. The monitoring test piece 21 and the monitoring reference electrode 22 are both buried in the soil pipe 9, and the interference of stray current in the soil on the measurement of the potential difference between the monitoring test piece 21 and the monitoring reference electrode 22 is eliminated by the barrier of the soil pipe 9, thereby improving the accuracy of the measured potential. In addition, the comparison test piece 4 is located outside the soil pipe 9, so that the copper sulfate leaked from the monitoring reference electrode 22 is only inside the soil pipe 9 or directly below the soil pipe 9, and does not contact the comparison test piece 4, thereby ensuring that the comparison test piece 4 will not be invalid due to copper ion pollution.

[0043] In some embodiments, the comparison reference electrode 10 is further buried underground, and the monitoring terminal 1 further has a test voltmeter 11 electrically connected to the comparison reference electrode 10 and the monitoring reference electrode 22, respectively.

[0044] The content of copper sulfate in the monitoring reference electrode 22 is relatively large, and a small amount of copper sulfate leakage will cause the monitoring test piece 21 to be invalid due to copper ion pollution, but the monitoring reference electrode 22 does not necessarily fail. Therefore, when the failure detection device determines that the monitoring test piece 21 is invalid, it cannot accurately determine whether the monitoring reference electrode 22 is invalid. In addition, if the monitoring reference electrode 22 is invalid, the potential difference between the monitoring reference electrode 22 and the comparison reference electrode 10 will be smaller than when the monitoring terminal 1 and the monitoring sensor 2 are initially installed. Therefore, the potential difference between the comparison reference electrode 10 and the monitoring reference electrode 22 is measured in real time by the test voltmeter 11, and when the measured potential difference decreases, it is determined that the monitoring reference electrode 22 is invalid, thereby more comprehensively and accurately distinguishing between reference electrode failure and test piece failure.

[0045] In some embodiments, the comparison reference electrode 10 is a high-purity zinc reference electrode. The high-purity zinc reference electrode is a metal member itself and does not contain a copper sulfate solution, thereby eliminating the problem of copper sulfate leakage and failure, and being able to stably maintain effectiveness for a long time, ensuring that the change in the potential difference between the comparison reference electrode 10 and the monitoring reference electrode 22 can accurately reflect whether the monitoring reference electrode 22 is invalid, thereby ensuring the accuracy of failure detection.

[0046] In some embodiments, the comparison reference electrode 10 is located above the monitoring reference electrode 22, so that the copper sulfate solution leaked from the monitoring reference electrode 22 will not contact the comparison reference electrode 10 during the downward flow of the copper sulfate solution, thereby avoiding copper ion pollution of the comparison reference electrode 10 due to contact with the copper sulfate solution, and further ensuring that the change in the potential difference between the comparison reference electrode 10 and the monitoring reference electrode 22 can accurately reflect whether the monitoring reference electrode 22 is invalid, thereby ensuring the accuracy of failure detection of the monitoring reference electrode 22.

[0047] In some embodiments, the positive pole of the test ammeter is connected to the electrical connection point of the monitoring test piece, and the negative pole of the test ammeter is connected to the electrical connection point of the contrast test piece, so that when the current reading on the test ammeter is positive, it can be clearly indicated that the current flow direction between the monitoring test piece and the contrast test piece is from the monitoring test piece to the contrast test piece; when the current reading on the test ammeter is negative, it can be clearly indicated that the current flow direction between the monitoring test piece and the contrast test piece is from the contrast test piece to the monitoring test piece. By determining the relationship between the positive and negative of the current reading and the current flow direction through the connection mode of the test ammeter, it is further determined that the failure condition of the monitoring test piece 21 is that the current reading is positive and exceeds the threshold, making the failure determination of the monitoring test piece 21 easier and more direct.

[0048] In some embodiments, the contrast reference electrode 10, the monitoring test piece 21 and the monitoring reference electrode 22 are all located in the soil pipe 9 buried underground. The soil pipe 9 further sheaths the contrast reference electrode 10, avoiding the interference of stray current on the measured potential difference between the contrast reference electrode 10 and the monitoring reference electrode 22, and ensuring that the potential difference between the contrast reference electrode 10 and the monitoring reference electrode 22 accurately reflects whether the monitoring reference electrode 22 is invalid.

[0049] In some embodiments, the contrast test piece 4 is located on one side of the monitoring sensor 2 in the horizontal direction, away from the space below the monitoring sensor 2, to avoid pollution of the contrast test piece 4 by leaked copper sulfate.

[0050] In some embodiments, the distance between the contrast test piece 4 and the monitoring test piece 21 is greater than or equal to 0.5m, ensuring that there is enough distance between the two to avoid pollution of the contrast test piece 4 by leaked copper sulfate.

[0051] In some embodiments, the contrast road switch 12 is installed on the polarization lead 3, and the contrast road switch 12 is located between the electrical connection point of the contrast test piece 4 and the electrical connection point of the monitoring test piece 21. When the monitoring device is monitoring the de-energized potential of the protected pipeline 6, the contrast road switch 12 is disconnected at the same time as the main road switch 8 is disconnected, eliminating the electrical connection between the monitoring test piece 21 and the contrast test piece 4, ensuring that the monitoring voltmeter 7 only measures the potential difference between the monitoring test piece 21 and the monitoring reference electrode 22, and ensuring accurate potential measurement.

[0052] Finally, it should be noted that: the various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts of each embodiment can be referred to.

[0053] The above examples are only used to illustrate the technical solutions of the present application and not to limit them; although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the specific embodiments of the present application can be modified or some technical features can be replaced by equivalent ones; without departing from the spirit of the technical solutions of the present application, all of them should be covered in the technical solution range of the present application claimed.

Claims

1. A failure detection device for a cathodic protection sensor, characterized by, The utility model relates to a kind of soil corrosion monitoring device, including: Monitoring terminal, with monitoring voltmeter and main road switch; Monitoring sensor, buried in underground, with monitoring test piece and monitoring reference electrode, the monitoring voltmeter is electrically connected with the monitoring test piece and the monitoring reference electrode respectively; Polarization wire, electrically connected with buried underground protected pipeline, the monitoring test piece is electrically connected with the polarization wire, the main road switch is installed on the polarization wire, and located between the electrically connected point of the monitoring test piece and protected pipeline; Contrast test piece, buried in underground, and electrically connected with the polarization wire, close the main road switch, and the contrast test piece and the monitoring test piece are electrically connected with protected pipeline; Test ammeter, installed on the polarization wire, and located between the electrically connected point of the contrast test piece and the electrically connected point of the monitoring test piece, whether the monitoring test piece is invalid is judged by the current reading of the test ammeter when the main road switch is disconnected.

2. The apparatus for detecting failure of a cathodic protection sensor according to claim 1, characterized by Soil pipe is buried in underground, and the monitoring test piece and the monitoring reference electrode are located in the soil pipe.

3. The apparatus for detecting failure of a cathodic protection sensor according to claim 1, wherein Further including contrast reference electrode buried in underground, the monitoring terminal further has test voltmeter, and the test voltmeter is electrically connected with the contrast reference electrode and the monitoring reference electrode respectively.

4. The apparatus for detecting failure of a cathodically protected sensor according to claim 3, wherein The contrast reference electrode is high-purity zinc reference electrode.

5. The apparatus for detecting failure of a cathodically protected sensor according to claim 3, wherein The contrast reference electrode is located above the monitoring reference electrode.

6. The apparatus for detecting failure of a cathodically protected sensor of claim 1, wherein The positive pole of the test ammeter is connected with the electrically connected point of the monitoring test piece, and the negative pole of the test ammeter is connected with the electrically connected point of the contrast test piece.

7. The apparatus for detecting failure of a cathodically protected sensor according to claim 3, wherein The contrast reference electrode, the monitoring test piece and the monitoring reference electrode are located in the soil pipe buried in underground.

8. The apparatus for detecting failure of a cathodically protected sensor of claim 1, wherein The contrast test piece is located on one side of the monitoring sensor in horizontal direction.

9. The apparatus for detecting failure of a cathodically protected sensor of claim 1, wherein The distance between the contrast test piece and the monitoring test piece is greater than or equal to 0.5m.

10. The apparatus for detecting failure of a cathodically protected sensor of claim 1, wherein Contrast road switch is installed on the polarization wire, and the contrast road switch is located between the electrically connected point of the contrast test piece and the electrically connected point of the monitoring test piece.

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