Coating failure monitoring device, monitoring system and wind generating set

Abstract

The utility model provides a coating failure monitoring device and system and a wind generating set, the coating failure monitoring device comprises a shell, a measuring element connected to the shell and a measuring circuit electrically connected with the measuring element, the measuring element comprises a working electrode array, a reference electrode and a temperature compensation electrode, the working electrode array comprises a plurality of working electrodes, the working electrodes are arranged on the shell at intervals in the first direction and extend in the second direction, and the reference electrodes are connected to the shell and arranged on one side of the working electrode array in the second direction at intervals; the temperature compensation electrodes are connected to the shell and arranged on the other side of the working electrode array in the second direction at intervals, the temperature compensation electrodes extend in the first direction, and the coating failure monitoring device can conduct integrity monitoring on a coating of a basic structure and can further conduct deep monitoring on the metal corrosion condition under the condition that the coating is peeled off.

Description

TECHNICAL FIELD

[0001] The present disclosure belongs to the technical field of coating monitoring, and particularly relates to a coating failure monitoring device, a monitoring system and a wind turbine generator set. BACKGROUND

[0002] With the wide popularity of clean energy, offshore wind turbine generators have gradually attracted people's attention. Since the foundation structure of the offshore wind turbine generator is usually fixed to the seabed, the environment of part of the foundation structure is humid or even in contact with seawater for a long time, so that the foundation structure is prone to corrosion. In order to improve the use safety of the foundation structure, it is necessary to provide a coating failure monitoring device capable of detecting the coating failure state of the foundation structure of the wind turbine generator. CONTENT OF THE UTILITY MODEL

[0003] The main purpose of the present disclosure is to provide a coating failure monitoring device, a monitoring system and a wind turbine generator set, so as to detect the coating failure state of the foundation structure.

[0004] In order to achieve the above purpose, the present disclosure provides the following technical solutions:

[0005] In one aspect of the present disclosure, a coating failure monitoring device is provided for monitoring the coating failure of a wind turbine generator set component, the coating failure monitoring device comprising a housing, a measurement element connected to the housing, and a measurement circuit electrically connected to the measurement element, the measurement element comprising a working electrode array, a reference electrode, and a temperature compensation electrode, the working electrode array comprising a plurality of working electrodes, the plurality of working electrodes being arranged at intervals along a first direction in the housing, the working electrodes extending along a second direction, the reference electrode being connected to the housing and arranged at intervals on one side of the working electrode array in the second direction, the temperature compensation electrode being connected to the housing and arranged at intervals on the other side of the working electrode array in the second direction, the temperature compensation electrode extending along the first direction.

[0006] In an example embodiment of the present disclosure, the housing is a conductive housing, the measurement circuit comprises an electrochemical measurement circuit, the electrochemical measurement circuit comprises a test module, the test module has three wiring ports of a working electrode port, a counter electrode port, and a reference electrode port, and is electrically connected to the working electrode array, the housing, and the reference electrode through a first relay respectively, for measuring the potential difference between the working electrode and the reference electrode, wherein each working electrode in the working electrode array is controlled by a switching circuit.

[0007] Optionally, the measurement circuit further comprises a resistance method measurement circuit, the resistance method measurement circuit comprising a power supply, a second relay, a galvanometer and a first voltmeter, the resistance method measurement circuit being electrically connected with the working electrode array and the temperature compensation electrode through the second relay, for measuring the voltage of the working electrode and the temperature compensation electrode, and then obtaining the wall thickness loss of the working electrode according to the voltage of the working electrode.

[0008] In particular, the resistance method measurement circuit further comprises a second voltmeter for measuring the voltage of the temperature compensation electrode, the second voltmeter being connected in parallel with the temperature compensation electrode.

[0009] Further, the coating failure monitoring device further comprises an external lead wire electrically connected with the working electrode, for being electrically connected with the foundation structure of the wind turbine generator.

[0010] In another example embodiment of the present disclosure, the distance between adjacent working electrodes is not greater than 2 mm; and / or, the plurality of working electrodes are arranged in isolation from each other; and / or, the temperature compensation electrode and the working electrode are of the same material; and / or, the shell is filled with epoxy resin filling glue, so that the plurality of working electrodes and the temperature compensation electrode are positioned and separated from each other; and / or, the reference electrode is a cylindrical solid-state reference electrode, the reference electrode is arranged in isolation from the working electrode, and the reference electrode is electrically connected with the working electrode; and / or, the working electrode array comprises 8 working electrodes arranged in parallel, the working electrodes are arranged in isolation from the temperature compensation electrode, 8 working electrodes are arranged in parallel with each other and the temperature compensation electrode is arranged in series with the working electrode array through a lead wire; and / or, the working electrode is a hexahedral structure, the temperature compensation electrode and the working electrode are of the same shape, and the epoxy resin filling glue covers the temperature compensation electrode.

[0011] In another aspect of the present disclosure, a monitoring system is provided, the monitoring system comprising a controller and a coating failure monitoring device as described above, the coating failure monitoring device being communicatively connected with the controller, the controller obtaining voltage information and current information of the working electrode from the coating failure monitoring device, and determining the corrosion state of the working electrode according to the voltage information and the current information.

[0012] In an example embodiment of the present disclosure, the monitoring system comprises a plurality of coating failure monitoring devices, the plurality of coating failure monitoring devices being used to be connected at different parts of the foundation structure of the wind turbine generator.

[0013] In another aspect, this disclosure provides a wind turbine generator set, the wind turbine generator set including a foundation structure and a monitoring system as described above, wherein a plurality of coating failure monitoring devices of the monitoring system are arranged at intervals along the height direction of the foundation structure.

[0014] In another exemplary embodiment of this disclosure, the wind turbine is an offshore wind turbine, and the coating failure monitoring device located in the tidal zone and / or the fully submerged zone is electrically connected to the part of the foundation structure to be tested.

[0015] The coating failure monitoring device, monitoring system, and wind turbine generator provided in this disclosure have at least the following beneficial effects: The coating failure monitoring device includes a working electrode array consisting of multiple working electrodes spaced apart along a first direction, and a reference electrode and a temperature compensation electrode spaced apart on both sides of the working electrode array in a second direction. The coating failure monitoring device can monitor the integrity of the coating of the base structure, and can also conduct in-depth monitoring of metal corrosion when the coating peels off. Attached Figure Description

[0016] The above and / or other objects and advantages of this disclosure will become clearer from the following description of embodiments taken in conjunction with the accompanying drawings, in which:

[0017] Figure 1 This is a structural diagram of a coating failure monitoring device provided as an exemplary embodiment of the present disclosure.

[0018] Figure 2 for Figure 1 The layout diagram of the measuring elements of the coating failure monitoring device.

[0019] Figure 3 for Figure 1 A simplified structural diagram of the electrochemical testing circuit of the coating failure monitoring device.

[0020] Figure 4 for Figure 1 A simplified diagram of the resistance measurement circuit of the coating failure monitoring device.

[0021] Figure 5 A simplified structural diagram of a test system provided for an exemplary embodiment of this disclosure applied to an infrastructure.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Shell; 2. Top wall;

[0024] 3. Bolts; 4. Bottom wall;

[0025] 6. Working electrode; 7. Temperature compensation electrode;

[0026] 8. Electrochemical workstation;

[0027] 9. Reference electrode; 10. Epoxy resin filling glue;

[0028] 11. First relay; 12. Second relay;

[0029] 13. First voltmeter; 14. Second voltmeter;

[0030] 15. Ammeter;

[0031] 51. Cable joint; 52. Wire;

[0032] 80. Terminal server; 90. Infrastructure;

[0033] 100. Coating failure monitoring device. DETAILED DESCRIPTION

[0034] Example embodiments will now be described more fully with reference to the accompanying drawings. The example embodiments, however, are not to be construed as limiting the scope of the disclosure. Like reference numerals in different drawings denote like structural elements and the detailed description of them will be omitted.

[0035] Referring to Figure 1 and Figure 2 , the disclosure provides a monitoring system including a coating failure monitoring device 100 for monitoring coating failure of a wind turbine component.

[0036] The coating failure monitoring device 100 is used to monitor whether the coating of the wind turbine component at the location thereof is failed, and can obtain a metal corrosion state parameter of the wind turbine component according to the monitoring data. For example, but not limited to, the metal corrosion state parameter can include a metal corrosion depth, and / or a metal corrosion rate, etc.

[0037] In the present embodiment, the coating failure monitoring device 100 is taken as an example to monitor the coating failure of the infrastructure of the wind turbine, but is not limited thereto.

[0038] The coating failure monitoring device 100 provided by the disclosure is used to monitor the coating failure state of the wind turbine component, and the coating failure state can include whether the coating is complete. When the coating damage is monitored, the metal corrosion state parameter can be further monitored. Generally, the coating failure includes coating peeling or coating cracking, but is not limited thereto.

[0039] Continuing to refer to Figure 1 and Figure 2The coating failure monitoring device 100 comprises a housing 1, a measuring element connected to the housing 1, and a measuring circuit electrically connected to the measuring element. The measuring element comprises a working electrode array, a reference electrode 9, and a temperature compensation electrode 7. The working electrode array comprises a plurality of working electrodes 6. The plurality of working electrodes 6 are arranged in a first direction on the housing 1. The working electrodes 6 extend in a second direction. The reference electrode 9 is connected to the housing 1 and is arranged on one side of the working electrode array in the second direction. The temperature compensation electrode 7 is connected to the housing 1 and is arranged on the other side of the working electrode array in the second direction. The temperature compensation electrode 7 extends in the first direction.

[0040] As an example, the first direction and the second direction are arranged perpendicularly, but are not limited thereto.

[0041] In the embodiment, the projections of the center of the reference electrode 9 and the center of the temperature compensation electrode 7 on the top wall 2 (described below) of the housing 1 are arranged approximately symmetrically with respect to the working electrode array, but are not limited thereto.

[0042] Continuing to refer to Figure 1 and Figure 2 , in the embodiment, the housing 1 is a hexahedral housing. The housing 1 comprises a bottom wall 4, which can be used to be fixed on the foundation structure of the wind turbine generator set, for example but not limited to, can be fixed on the foundation structure by means of fasteners or welding. As an example, the bottom wall 4 can be connected to the foundation structure of the wind turbine generator set to be measured by means of bolts 3, but is not limited thereto.

[0043] In the embodiment, the top wall 2 of the housing 1 is arranged opposite to the bottom wall 4. The housing 1 has an accommodation cavity enclosed by the top wall 2 and the bottom wall 4. The measuring element can be arranged in the accommodation cavity. The working electrode array can be arranged on the top wall 2, but is not limited thereto. The top wall 2 can be provided with an opening. The top surface of the working electrode 6 can be in contact with the external environment through the opening, for example but not limited to, the external environment can be seawater, but is not limited thereto. According to the needs, the top surface of the working electrode 6 can be flush with the surface of the top wall 2, but is not limited thereto. According to the needs, the top surface of the working electrode 6 can be arranged outwardly protruding relative to the surface of the top wall 2, or arranged inwardly recessed relative to the surface of the top wall 2, but is not limited thereto.

[0044] As an example, the housing 1 can be sealed to avoid seawater entering the accommodation cavity of the housing 1 and causing corrosion damage to the measuring element in the housing 1, affecting the test accuracy, but is not limited thereto. The side wall of the housing 1 is provided with a cable joint 51. The lead 52 is electrically connected to the measuring element through the cable joint 51, but is not limited thereto.

[0045] In the embodiment, the shell 1 can be a conductive shell, for example but not limited to, the shell 1 can be a metal shell, but not limited thereto. According to the need, the shell 1 can be a corrosion-resistant metal shell, or a corrosion-resistant protective layer is coated on the surface of the ordinary metal shell, but not limited thereto.

[0046] With reference to Figure 1 and Figure 2 , among the plurality of working electrodes 6 of the working electrode array, adjacent working electrodes 6 are arranged at intervals, for example but not limited to, arranged at intervals along the first direction, so that adjacent working electrodes 6 are insulated, and the plurality of working electrodes 6 are formed in an insulated manner, but not limited thereto. According to the need, the distance between adjacent working electrodes 6 in the embodiment is not more than 2mm, so as to enhance the test signal, but not limited thereto. As an example, the plurality of working electrodes 6 can be connected in parallel by wires, but not limited thereto.

[0047] As an example, the working electrode 6 is substantially in a hexahedral structure, for example but not limited to, can be in a cuboid structure, the width direction of the working electrode 6 can be parallel to the first direction, and the length direction of the working electrode 6 can be parallel to the second direction, but not limited thereto. The height direction of the working electrode 6 can be parallel to the height direction of the shell 1, that is, the height direction is perpendicular to the bottom wall 4 and the top wall 2, but not limited thereto.

[0048] The embodiment takes 8 working electrodes 6 arranged in parallel and at equal intervals as an example for illustration, but not limited thereto.

[0049] In an optional embodiment, the working electrode 6 is made of the same material as the foundation structure of the wind turbine generator set, so that the corrosion condition of the working electrode 6 can approximately represent the corrosion condition of the foundation structure, so that the corrosion rate of the working electrode 6 is closer to the true value of the foundation structure of the wind turbine generator set, thereby improving the test accuracy of the coating failure monitoring device 100.

[0050] As an example, the top surface of the working electrode 6 in the height direction is a test surface, and the metal corrosion depth of the foundation structure of the wind turbine generator set can be fed back by detecting the corrosion depth of the test surface. Further, a coating layer can be coated on the top surface of the working electrode 6, and the material of the coating layer can be the same as the material of the coating layer arranged on the foundation structure of the wind turbine generator set, that is, the surface coating of the working electrode 6 is the same as the surface coating of the foundation structure, so that the corrosion condition of the working electrode 6 is closer to the corrosion condition of the foundation structure, so that the test of the coating failure monitoring device 100 is closer to the true value, thereby improving the test accuracy of the coating failure monitoring device 100, but not limited thereto.

[0051] With reference to Figure 1 and Figure 2Eight working electrodes 6 are spaced apart along a first direction and are parallel to each other. A reference electrode 9 and a temperature compensation electrode 7 are respectively spaced apart on both sides of the working electrode array along a second direction. The reference electrode 9 and the temperature compensation electrode 7 are spaced apart from and insulated from the working electrodes 6. This arrangement improves the space utilization of the coating failure monitoring device 100, but is not a limitation. Further, the reference electrode 9 and the temperature compensation electrode 7 are respectively located in the middle of the working electrode array along the first direction, but are not a limitation. As an example, the reference electrode 9 and the temperature compensation electrode 7 are electrically connected to the working electrodes 6 via wires, but are not a limitation.

[0052] Reference Figure 3 In this embodiment, the reference electrode 9 is a cylindrical solid-state reference electrode, with the central axis of the cylinder parallel to the height direction of the working electrode 6, but this is not a limitation. In an optional embodiment, the reference electrode 9 is connected in series with the working electrode array via wires, and multiple working electrodes 6 in the working electrode array are connected in parallel.

[0053] Since temperature changes cause variations in the resistance of the metal at the test site, in this embodiment, the temperature compensation electrode 7 can be used to eliminate measurement errors caused by temperature changes, thereby improving the monitoring stability of the coating failure monitoring device 100. Specifically, under the action of the temperature compensation electrode 7, the parameter indicators are kept as constant as possible or changed as little as possible when the temperature changes, so as to ensure that the measurement circuit operates normally and stably within a certain temperature range.

[0054] To prevent the temperature compensation electrode 7 from being corroded, the top surface of the temperature compensation electrode 7 is covered with an insulating protective layer, for example, but not limited to, the insulating protective layer can be made of epoxy resin filler, that is, epoxy resin filler 10 covers the top surface of the temperature compensation electrode 7.

[0055] Specifically, the working electrode array may include eight working electrodes 6, which may be arranged in parallel. The temperature compensation electrode 7 may be connected in series with the working electrode array. Thus, when measuring a single working electrode 6, the temperature compensation electrode 7 may be connected in series with that single working electrode 6, but this is not a limitation.

[0056] In the embodiment, the temperature compensation electrode 7 has the same structural parameters as the working electrode 6, but is not limited thereto. The temperature compensation electrode 7 has the same shape as the working electrode 6. It can be understood that the temperature compensation electrode 7 has a hexahedral structure in the embodiment, and the size of each direction of the temperature compensation electrode 7 is the same as the size of each direction of the working electrode 6. The difference is that the length direction of the temperature compensation electrode 7 is parallel to the first direction, the width direction of the temperature compensation electrode 7 is parallel to the second direction, the thickness direction of the temperature compensation electrode 7 is parallel to the height direction of the shell 1, and is parallel to the thickness direction of the working electrode 6, but is not limited thereto. Further, in the embodiment, the temperature compensation electrode 7 and the working electrode 6 can be made of the same material, but are not limited thereto.

[0057] Return Figure 2 In the embodiment, the coating failure monitoring device 100 can further include an epoxy resin filling glue 10 filled in the shell 1. The epoxy resin filling glue 10 is filled between adjacent working electrodes 6, between the working electrode 6 and the reference electrode 9, and between the temperature compensation electrode 7 and the working electrode 6, so as to position the working electrode 6, the reference electrode 9 and the temperature compensation electrode 7 by the epoxy resin filling glue 10. Further, since the epoxy resin filling glue 10 is an insulating structure, the gap between the working electrode 6, the reference electrode 9 and the temperature compensation electrode 7 filled by the epoxy resin filling glue 10 can reliably insulate the working electrode 6, the reference electrode 9 and the temperature compensation electrode 7, but is not limited thereto.

[0058] In the embodiment, the epoxy resin filling glue covers each surface of the temperature compensation electrode 7, so as to avoid corrosion damage of the temperature compensation electrode 7 caused by contact with seawater, and improve the service life of the temperature compensation electrode 7. That is, the epoxy resin filling glue 10 covers each surface of the temperature compensation electrode 7, but is not limited thereto.

[0059] In order to further improve the service life of the temperature compensation electrode 7, the outer periphery of the temperature compensation electrode 7 can be sprayed with a protective layer as needed, for example but not limited to, the protective layer is a chromium oxide ceramic. Under the action of the protective layer, corrosion damage of the temperature compensation electrode 7 can be prevented.

[0060] The disclosure can effectively reduce the influence of temperature change on the resistance measurement accuracy of the working electrode 6 by including the temperature compensation electrode 7 in the coating failure monitoring device 100, and stabilize the measurement current performance, thereby improving the measurement accuracy. As an example, the temperature compensation electrode 7 and the working electrode 6 are connected in series in the resistance measurement circuit, so as to reduce the influence of temperature change on the working electrode 6 when the working electrode 6 is connected to the circuit. As an example, the two ends of the working electrode 6 in the length direction are connected in series with the two ends of the temperature compensation electrode 7 in the length direction by wires, but are not limited thereto.

[0061] In this embodiment, the measurement circuit includes an electrochemical measurement circuit (as shown in Figure 3 The electrochemical measurement circuit includes a test module having three connection ports of working electrode (WE) port, counter electrode (CE) port and reference electrode (RE) port, which are electrically connected with the working electrode array, the shell 1 and the reference electrode 9 through the first relay 11 respectively, for measuring the potential difference between the working electrode and the reference electrode 9, wherein each working electrode in the working electrode array is controlled by the switching circuit.

[0062] Continuing to refer to Figure 3 The electrochemical measurement circuit is used to perform electrochemical impedance spectroscopy measurement to obtain the coating water permeability information and the metal potential and galvanic current information under the coating, for positioning the location of the coating failure part of the infrastructure. The electrochemical impedance spectroscopy can provide detailed information of the coating protection performance, failure mechanism and its change over time, for evaluating the integrity of the coating, but not limited thereto. When the impedance value is high, it indicates that the coating is complete, and when the impedance value is low, it indicates that the coating is failed, and the coating may have micropores, or cracks, or peeling, etc.

[0063] As an example, the test module can include an electrochemical workstation 8, but not limited thereto.

[0064] The electrochemical workstation 8 can have three connection ports of working electrode (WE) port, counter electrode (CE) port and reference electrode (RE) port, which are electrically connected with the working electrode array, the shell 1 and the reference electrode 9 in the coating failure monitoring device through the first relay 11 respectively, and each working electrode 6 in the working electrode array is controlled by the switching circuit, the electrochemical workstation 8 is used to measure the electrochemical impedance spectroscopy of the working electrode 6, the potential difference between the working electrode 6 and the reference electrode 9, and the galvanic current between each working electrode 6 in the working electrode array, for judging whether the coating of the metal structure at the location of the coating failure monitoring device is complete.

[0065] When the first relay 11 is closed and conducted, there will be current flowing between different working electrodes 6 under the condition that the coating surface of the to-be-measured part of the infrastructure is covered with liquid film (i.e. the infrastructure is located in seawater), the current signals on the loops of the plurality of working electrodes 6 can be monitored, and the characteristics of each current signal can be analyzed, for example but not limited to, the time domain characteristics and frequency domain characteristics of the current signal can be analyzed, and the impedance value at the location of the working electrode 6 is calculated to judge whether the coating is failed, so that the coating damage location can be positioned by the electrochemical measurement circuit.

[0066] Specifically, the electrochemical workstation can be used to measure the potential and galvanic current of the working electrode 6, for judging whether the coating of the to-be-measured part is failed, specifically as follows:

[0067] Firstly, the first relay 11 can be activated to control the switching circuit, and the electrochemical workstation 8 can be used to measure the potential difference between each working electrode 6 and the reference electrode 9 in the working electrode array;

[0068] Then, the first relay 11 can be activated to control the switching circuit, and the electrochemical workstation 8 can be used to measure the galvanic current between the predetermined working electrode 6 and the remaining working electrodes 6 in the working electrode array.

[0069] Further, based on the measurement results of the potential difference and the galvanic current, the integrity of the coating of the foundation structure can be confirmed, and the location of the damaged part of the coating can be found.

[0070] In addition, after the location of the coating failure is determined, the coating failure monitoring device can further monitor the damaged part. In this embodiment, the measurement circuit further includes a resistance measurement circuit (as shown in Figure 4 For example, but not limited to, the size of the coating failure area can be calculated, the rate of coating peeling can be calculated, and information such as the depth of metal corrosion and the rate of metal corrosion can be monitored.

[0071] Specifically, the resistance measurement circuit of the coating failure monitoring device can be used to measure the voltage of the working electrode 6 and the temperature compensation electrode 7, and then the wall thickness loss of the working electrode 6 can be obtained according to the voltage.

[0072] In this embodiment, the resistance measurement circuit includes a power supply, a second relay 12, a current meter 15, and a first voltage meter 13. The resistance measurement circuit is electrically connected to the working electrode 6 and the temperature compensation electrode 7 of the working electrode array through the second relay 12, and is used to measure the voltage of the working electrode 6 and the temperature compensation electrode 7, and then the wall thickness loss of the working electrode 6 can be obtained according to the voltage of the working electrode 6.

[0073] In this embodiment, each working electrode 6 in the working electrode array is connected to the first voltage meter 13 in a matrix manner through a relay group. Each relay group includes 8 relays, respectively corresponding to each working electrode 6, so that a closed loop is formed between the power supply, the temperature compensation electrode 7, and the working electrode 6.

[0074] When the coating failure monitoring device detects that the coating of the to-be-measured part is damaged, the relays at different positions of the matrix circuit can be disconnected or connected to selectively connect different working electrodes 6 to the circuit to measure the voltage of different working electrodes 6, thereby monitoring the physical signal of the corrosion position and further monitoring the corrosion position. For example, but not limited to, the depth of metal corrosion and / or the rate of metal corrosion can be monitored.

[0075] Continuing to refer toFigure 4 The following explanation uses the test of working electrode W1 in the figure as an example, but is not limited to this. First, relays C4, C8, D1, and D4 can be closed, and the voltage data of working electrode W1 can be measured using the first voltmeter. The thickness reduction of each working electrode 6 can be calculated using the resistance method to obtain the wall thickness loss of the base structure. The corrosion rate of the base structure can also be further calculated.

[0076] In this embodiment, after the working electrode 6 is connected to the resistance measurement circuit, the length of the working electrode 6 remains unchanged. When it is corroded in the height direction, the dimension of the working electrode 6 in the height direction becomes smaller. At this time, the area of ​​the cross-section of the working electrode 6 (the cross-section is perpendicular to the length direction of the working electrode 6) becomes smaller, and the resistance of the working electrode 6 will increase (the cross-sectional area of ​​the working electrode 6 is linearly related to the resistance). The amount of corrosion reduction of the working electrode 6 in the height direction, i.e. the amount of thickness reduction, is calculated by testing the change in resistance of the working electrode 6.

[0077] In this embodiment, the resistance measurement circuit further includes a second voltmeter 14, which is connected to the temperature compensation electrode 7 to measure the voltage of the temperature compensation electrode 7, but is not limited thereto.

[0078] like Figure 4 As shown, the second relay 12 can be activated to turn on the power supply. By adjusting the two sets of relays C1~C8 and D1~D8 in the circuit, a closed loop is formed between the power supply, the temperature compensation electrode 7, and the single working electrode 6. Taking the test of the working electrode W1 in the figure as an example, relays C4, C8, D1, and D4 are closed, and the voltage data is measured using the first voltmeter 13 and the second voltmeter 14. The thickness reduction of each working electrode 6 is calculated using the resistance method, and the corrosion rate of the working electrode 6 is further calculated.

[0079] To improve the monitoring accuracy of the coating failure monitoring device, the device may also include an external conductor (not shown in the figure). This external conductor is electrically connected to the working electrode 6 and is used for electrical connection with the foundation structure. Typically, to provide cathodic protection for the wind turbine foundation structure, current flows through it. By electrically connecting the coating failure monitoring device to the foundation structure at its location, the same cathodic protection is achieved, ensuring that the environment of the coating failure monitoring device and the corresponding measured part of the foundation structure is identical, thereby improving the monitoring accuracy of the coating failure monitoring device.

[0080] The failure status of the foundation structure of the wind turbine generator was monitored using the aforementioned coating failure monitoring device, and the general description is as follows:

[0081] First, the coating failure monitoring device can be placed on the part of the wind turbine's foundation structure to be tested.

[0082] Then, the second relay 12 can be disconnected, so that the resistance method measurement circuit is disconnected, and the first relay 11 is connected, so that the electrochemical measurement circuit is turned on;

[0083] Then, the current signal is collected by the ammeter, and when a large coupling current signal is generated between two working electrodes 6, it is judged that there is a coating damage near the two working electrodes 6. If the coating is damaged, the coating damage position can be located.

[0084] After the coating damage position is determined, the first relay 11 is disconnected, so that the electrochemical measurement circuit is disconnected, and the second relay 12 is connected, so that the resistance method measurement circuit enters the preparation state;

[0085] The relays Cn and Dn on both sides of the predetermined working electrode 6 are sequentially turned on, and the values of the first voltage meter and the second voltage meter are measured;

[0086] Until the data measurement of the voltage of all working electrode 6 measurement areas is completed;

[0087] According to the voltage data, the wall thickness loss of each working electrode 6 is calculated, that is, the metal loss of the basic structure at the position of the working electrode 6 can be fed back.

[0088] Another aspect of the present disclosure provides a monitoring system, which comprises a controller and a coating failure monitoring device as described above, the coating failure monitoring device is in communication connection with the controller, the controller obtains the voltage information and current information of the working electrode 6 from the coating failure monitoring device, and judges the corrosion state of the working electrode 6 according to the voltage information and current information.

[0089] Specifically, the electrochemical measurement circuit of the coating failure monitoring device can perform electrochemical impedance spectroscopy measurement to obtain coating water permeability information and metal potential and galvanic current information under the coating, so as to preliminarily locate the corrosion position of the basic structure. The resistance method measurement circuit can measure the metal corrosion information, for example, but not limited to, the thickness of the metal loss at the corrosion position can be calculated according to the measured voltage data, and the metal corrosion information under the coating can be obtained.

[0090] In order to be able to monitor different height positions of the basic structure, the coating failure monitoring device can be provided as needed. Multiple coating failure monitoring devices can be arranged on the basic structure in the height direction of the basic structure, so as to monitor different parts of the basic structure by different coating failure monitoring devices, but not limited thereto.

[0091] Another aspect of the present disclosure provides a wind turbine generator, which comprises a basic structure and a monitoring system as described above, and multiple coating failure monitoring devices are arranged in the height direction of the basic structure.

[0092] Specifically, the wind turbine generator set is an offshore wind turbine generator set, and the coating failure monitoring device arranged in the tidal zone and / or the full immersion zone is electrically connected with the to-be-measured part of the foundation structure. By arranging the coating failure monitoring device at different height positions of the foundation structure, the corrosion environment and corrosion condition of different partitions can be effectively compared in the spatial level, and theoretical guidance can be provided for subsequent coating of the offshore wind power foundation, thereby facilitating subsequent coating selection.

[0093] The wind turbine generator set provided by the embodiment can be an offshore wind turbine generator set, but is not limited thereto. The foundation structure can include a single pile foundation or a jacket foundation structure, but is not limited thereto.

[0094] With reference to Figure 5 The marine environment where the foundation structure of the offshore wind turbine generator set is located can be divided into an atmospheric zone, a splash zone, a tidal zone, a full immersion zone, and a sea mud zone (not shown in the figure) from top to bottom. In order to improve the service life of the foundation structure, protective coating needs to be arranged on the foundation structure except for the sea mud zone. These regions are key parts of the foundation structure, and therefore, the coating needs to be detected to determine whether the coating in each partition has failed and the corrosion condition after the coating failure.

[0095] In order to monitor the entire region of the foundation structure, multiple coating failure monitoring devices are arranged in the atmospheric zone, the splash zone, the tidal zone, and the full immersion zone of the site where the foundation structure is located. The coating surface parameters are crucial for coating failure determination.

[0096] Generally, the foundation structure located in the tidal zone and the full immersion zone is supplied with current to obtain cathodic protection. As an example, the coating failure monitoring device arranged in the tidal zone and the full immersion zone is electrically connected with the foundation structure at the location. The coating failure monitoring device is electrically connected with the foundation structure at the location to obtain the same cathodic protection as the foundation structure, so that the coating failure monitoring device and the foundation structure at the measured part corresponding to the coating failure monitoring device are in the same environment, thereby improving the monitoring accuracy of the coating failure monitoring device, but is not limited thereto.

[0097] Since the foundation structure located in the atmospheric zone and the splash zone does not need to be supplied with current for cathodic protection, the coating failure monitoring device arranged on the foundation structure in the atmospheric zone and the splash zone does not need to be electrically connected with the wind turbine contact structure, but is not limited thereto.

[0098] When the monitoring starts, the electrochemical measurement circuit and the resistance method measurement circuit independently participate in work, for example but not limited to, when the electrochemical measurement circuit is turned on, the resistance method measurement circuit can be turned off, and when the resistance method measurement circuit is turned on, the electrochemical measurement circuit can be turned on.

[0099] The electrochemical measurement circuit performs electrochemical impedance spectroscopy measurement to obtain coating water permeability information and metal potential and galvanic current information under the coating, so as to detect whether the coating is complete and whether there is coating peeling, thereby being able to preliminarily locate the corrosion position.

[0100] The resistance measurement circuit performs resistance measurement to obtain metal corrosion information under the coating.

[0101] The detection data of the electrochemical measurement circuit and the resistance measurement circuit are uniformly uploaded to a data processing device, for example but not limited to, a terminal server 80, and data processing is performed by the terminal server to integrate information to obtain corrosion information of the offshore foundation structure 90 in all partitions.

[0102] The coating peeling condition of the foundation structure 90 is monitored under the action of the resistance measurement circuit, the corrosion condition of the corrosion position is judged by monitoring the voltage condition of different working electrodes 6, and the corrosion state of the coating damage position is monitored in real time.

[0103] The coating failure monitoring device 100 provided by the present disclosure uses resistance method to monitor the corrosion condition of the foundation structure of the wind turbine generator set, that is, by placing the coating failure monitoring device 100 on the foundation structure of the wind turbine generator set, the corrosion state of the working electrode is judged by measuring the potential information of the working electrode 6 in the coating failure monitoring device 100 and the galvanic current between each working electrode, and then the corrosion state of the foundation structure of the wind turbine generator set is obtained.

[0104] The corrosion state of the foundation structure of the wind turbine generator set can be monitored by the coating failure monitoring device 100, for example but not limited to, the corrosion position of the foundation structure 90 can be located by the electrochemical measurement circuit, after the corrosion position is found, the resistance measurement circuit can be switched to, according to the measured voltage data, the metal corrosion thickness at the corresponding position of each working electrode 6 at the corrosion position is calculated, and the metal corrosion rate can be obtained.

[0105] The coating failure monitoring device 100 described above can provide a basis for formulating a corrosion prevention scheme, and can also be used to evaluate the effectiveness of the current corrosion prevention scheme, so as to be able to adjust the corrosion prevention strategy in a timely manner according to the monitoring result.

[0106] By the setting of the resistance measurement circuit and the electrochemical measurement circuit, the coating failure monitoring device of the present disclosure can be used to monitor whether the coating of the foundation structure 90 at the position is failed, so as to preliminarily locate the coating corrosion position, and can also be used to deeply detect the metal corrosion condition at the coating damage area.

[0107] The coating failure monitoring device provided by the present disclosure can track the wind power infrastructure and monitor the corrosion behavior of the infrastructure 90, and corrosion parameters such as the corrosion rate and the corrosion depth of the infrastructure 90 can be obtained by analysis, so as to timely and accurately find the position where corrosion occurs, and take anti-corrosion measures, thereby improving the service life of the infrastructure 90.

[0108] In the description of the present disclosure, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0109] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present disclosure, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0110] In the description of the present disclosure, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected, it can be mechanically connected, or it can be electrically connected, or it can be communicatively connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0111] The features, structures or characteristics described in the present disclosure can be combined in any suitable manner in one or more embodiments. In the above description, many specific details are provided to give a sufficient understanding of the embodiments of the present disclosure. However, those skilled in the art will realize that the technical solutions of the present disclosure can be practiced without one or more of the specific details, or other methods, components, materials, etc. can be used. In other cases, well-known structures, materials or operations are not shown or described in detail to avoid obscuring the aspects of the present disclosure.

Claims

1. A coating failure monitoring device for monitoring coating failure of wind turbine generator components, characterized in that, The coating failure monitoring device includes a housing (1), a measuring element connected to the housing (1), and a measuring circuit electrically connected to the measuring element. The measuring element includes: The working electrode array includes a plurality of working electrodes (6), which are spaced apart in the housing (1) along a first direction and extend along a second direction. A reference electrode (9) is connected to the housing (1) and spaced apart on one side of the working electrode array in the second direction. A temperature compensation electrode (7) is connected to the housing (1) and spaced apart on the other side of the second direction of the working electrode array, and the temperature compensation electrode (7) extends along the first direction.

2. The coating failure monitoring device as described in claim 1, characterized in that, The housing is a conductive housing. The measurement circuit includes an electrochemical measurement circuit, which includes a test module. The test module has three connection ports: a working electrode port, a counter electrode port, and a reference electrode port. These ports are electrically connected to the working electrode array, the housing (1), and the reference electrode (9) via a first relay (11), respectively, and are used to measure the potential difference between the working electrode and the reference electrode (9). Each working electrode in the working electrode array is controlled by a switching circuit.

3. The coating failure monitoring device as described in claim 2, characterized in that, The measurement circuit also includes a resistance measurement circuit, which includes a power supply, a second relay (12), an ammeter, and a first voltmeter (13). The resistance measurement circuit is electrically connected to the working electrode array and the temperature compensation electrode (7) through the second relay (12) to measure the voltage of the working electrode (6) and the temperature compensation electrode (7), and then obtain the wall thickness loss of the working electrode (6) based on the voltage of the working electrode (6).

4. The coating failure monitoring device as described in claim 3, characterized in that, The resistance measurement circuit also includes a second voltmeter (14) for measuring the voltage of the temperature compensation electrode (7), the second voltmeter (14) being connected in parallel with the temperature compensation electrode (7).

5. The coating failure monitoring device as described in claim 3, characterized in that, The coating failure monitoring device also includes an external wire electrically connected to the working electrode (6) for electrical connection to the foundation structure of the wind turbine generator set.

6. The coating failure monitoring device as described in any one of claims 1-5, characterized in that, The distance between adjacent working electrodes (6) is no greater than 2 mm; And / or, The plurality of said working electrodes (6) are insulated from each other; and / or, The temperature compensation electrode (7) and the working electrode (6) are made of the same material; and / or, The housing (1) is filled with epoxy resin filler (10) to position and space the plurality of working electrodes (6) and the temperature compensation electrode (7) from each other; and / or, The reference electrode (9) is a cylindrical solid-state reference electrode. The reference electrode (9) is insulated from the working electrode (6), and the reference electrode (9) is electrically connected to the working electrode (6); and / or, The working electrode array includes eight working electrodes (6) arranged in parallel. The working electrodes (6) are insulated from the temperature compensation electrode (7). The eight working electrodes (6) are connected in parallel with each other, and the temperature compensation electrode (7) is connected in series with the working electrode array via a wire; and / or, The working electrode (6) has a hexahedral structure, the temperature compensation electrode (7) has the same shape as the working electrode (6), and the epoxy resin filler (10) covers the temperature compensation electrode (7).

7. A monitoring system, characterized in that, The monitoring system includes a controller and a coating failure monitoring device as described in any one of claims 1-6. The coating failure monitoring device is communicatively connected to the controller. The controller obtains voltage and current information of the working electrode (6) from the coating failure monitoring device and determines the corrosion state of the working electrode (6) based on the voltage and current information.

8. The monitoring system as described in claim 7, characterized in that, The monitoring system includes multiple coating failure monitoring devices, which are connected to different parts of the foundation structure of the wind turbine generator.

9. A wind turbine generator set, characterized in that, The wind turbine generator set includes a foundation structure and a monitoring system as described in claim 7 or 8, wherein a plurality of coating failure monitoring devices of the monitoring system are arranged at intervals along the height direction of the foundation structure.

10. The wind turbine generator set as described in claim 9, characterized in that, The wind turbine generator set is an offshore wind turbine generator set, and the coating failure monitoring device located in the tidal zone and / or the fully immersed zone is electrically connected to the part of the foundation structure to be tested.

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