Electromagnet principle-based reliable detection device and detection method for potential of sacrificial anode of offshore wind power

Abstract

The invention provides a reliable detection device and detection method for the potential of an offshore wind power sacrificial anode based on an electromagnet principle, and belongs to the technical field of offshore wind power detection. The detection device comprises a reference electrode, a multimeter, a wire, an electromagnet, a wire length automatic calculation device and a power supply, the reference electrode is connected with the multimeter through the wire, the electromagnet is closely close to the reference electrode, the wire length automatic calculation device is matched with the wire, and the power supply controls the electromagnet to be powered on and powered off. According to the detection method, the wire placement length is set through the wire length automatic calculation device, the electromagnet is powered on to adsorb the surface of the steel structure to achieve positioning, detection points are switched after potential detection is completed, and all-directional detection is achieved through the orientation calibration module. Accurate positioning of the reference electrode is achieved through gravity and magnetism of the electromagnet, environment and man-made interference is eliminated through automatic calculation of the length of the wire and orientation calibration, the detection accuracy is improved, and a reliable basis is provided for sacrificial anode protection effect analysis.

Description

Technical Field

[0001] This invention relates to the field of offshore wind power equipment testing technology, and in particular to a reliable testing device and method for the sacrificial anode potential of offshore wind power based on the principle of electromagnets. Background Technology

[0002] According to relevant industry standards, when sacrificial anode corrosion protection is used for offshore wind turbine foundations, potential testing must be conducted annually. The traditional testing method involves placing a reference electrode with a conductor in seawater and using a multimeter to test the voltage between the electrode and the exposed steel of the platform. Simultaneously, reference electrodes are placed downwards on the platform at intervals of one meter, and the same test is conducted at three different locations to obtain the sacrificial potential value of the foundation and determine the protection effect.

[0003] However, traditional methods have significant drawbacks: the reference electrode is relatively lightweight, and its distance from the structure under test is uncontrollable under the influence of wind and water flow; furthermore, the reference electrode cannot be kept vertically downward, and even with a one-meter-long wire placed on the platform, the actual vertical height during measurement is often less than one meter. These factors lead to deviations in the test results, thus affecting the accuracy of judging the effectiveness of sacrificial anode protection. Therefore, a new detection technology that can eliminate interference from external environmental factors is urgently needed. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a reliable detection device and method for the sacrificial anode potential of offshore wind power based on the principle of electromagnetism. This solves the problems of inaccurate reference electrode positioning and significant environmental interference in traditional detection methods, thereby improving the accuracy and reliability of the detection results.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A reliable detection device for sacrificial anode potential in offshore wind power based on the principle of electromagnetism is disclosed. The device includes a reference electrode, a multimeter, a conductor, an electromagnet, an automatic conductor length calculation device, and a power supply. The reference electrode is connected to the multimeter via the conductor and is used to collect the potential signal of the steel structure of the offshore wind turbine foundation and transmit it to the multimeter. The electromagnet is positioned close to the reference electrode and has a preset weight, which is designed to withstand the impact of seawater currents. The power supply is electrically connected to the electromagnet and is used to control the on / off state of the electromagnet. When energized, the electromagnet generates magnetism and can be attracted to the surface of the steel structure; when de-energized, the magnetism disappears.

[0006] The automatic conductor length calculation device works in conjunction with the conductor to obtain the placement length of the conductor in real time and automatically set the placement length of the next section of conductor based on the length of the already deployed conductor, achieving automated and precise conductor placement. The automatic conductor length calculation device is also linked to a power supply; when the conductor reaches the set position, it triggers the power supply to energize the electromagnet. The detection device also includes a position calibration module, which can calculate and calibrate the detection positions in other directions based on the detection position in one direction, reducing the influence of human factors.

[0007] To adapt to the harsh marine environment, the surface of the reference electrode's conductor is equipped with a wear-resistant and corrosion-resistant layer, and the connection between the conductor and the reference electrode and the multimeter is equipped with a sealing structure to prevent seawater erosion from causing poor contact.

[0008] The present invention also provides a detection method comprising the following steps: Step 1: Lower the reference electrode of the detection device and the electromagnet together from the cage platform of the offshore wind power platform into the seawater. The automatic wire length calculation device obtains the initial wire placement length in real time. Step 2: The automatic wire length calculation device sets the target placement length of the next section of wire based on the initial placement length, and controls the wire to be accurately placed to the target position through the automatic wire placement device; Step 3: After the conductor reaches the target position, the automatic conductor length calculation device sends a trigger signal to the power supply, and the power supply automatically energizes the electromagnet. The electromagnet generates magnetism and is stably attracted to the steel structure surface of the offshore wind turbine pile foundation. Step 4: After the electromagnet has stabilized, the operator reads the potential value between the reference electrode and the steel structure using a multimeter to complete the test at this point. Step 5: After the test is completed, the operator cuts off the power. The electromagnet loses its magnetism and remains vertical under the action of gravity. Repeat steps 2)-4). The wire length automatic calculation device controls the wire to continue to be lowered to perform potential detection at different height positions. Step 6: Using the first orientation as a reference, calculate and calibrate the detection positions of the second and subsequent orientations through the orientation calibration module. After completing the potential detection of at least six detection points in each orientation, switch to the next orientation and repeat steps 1)-5) to complete the all-round potential detection.

[0009] Compared with the prior art, the present invention has the following beneficial effects: The detection device and method of this invention utilize the gravity of an electromagnet to keep the reference electrode vertically downward, resisting the impact of seawater flow. Simultaneously, when energized, the electromagnet adheres to the steel structure surface, ensuring a stable distance between the reference electrode and the structure under test. An automatic conductor length calculation device enables precise control and automated lowering of the conductor, ensuring accurate positioning of detection points at different heights. An orientation calibration module calibrates other orientations based on a reference orientation, reducing human positioning errors. These designs effectively eliminate the influence of external environmental factors such as wind and water flow, as well as human operational factors, on the detection results, significantly improving the accuracy and reliability of offshore wind power sacrificial anode potential detection, and providing important evidence for a comprehensive analysis of the protection effect of sacrificial anode blocks. Attached Figure Description

[0010] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention.

[0011] Among them: 1. Wind turbine tower; 2. Multimeter; 3. Automatic conductor placement device; 4. Cage platform; 5. Sea level; 6. Conductor; 7. Electromagnet; 8. Reference electrode. Detailed Implementation

[0012] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Example 1 like Figure 1 As shown, in the detection device of this embodiment, the reference electrode 8 is a silver / silver chloride reference electrode, which has the characteristics of good stability and resistance to seawater corrosion. The multimeter 2 is a high-precision digital multimeter with a measurement range of -2V to 2V and an accuracy class of 0.01, which can accurately acquire potential signals.

[0014] Electromagnet 7 is made of neodymium iron boron and weighs 5kg. This weight has been verified through actual sea trials to withstand the impact of seawater at common ocean current speeds, ensuring that the reference electrode 8 remains vertically downward. Electromagnet 7 has a rated voltage of 24V DC and a rated power of 50W. The magnetic force generated when energized can stably adhere to the steel structure surface of the offshore wind turbine foundation. The magnetism disappears instantly when the power is off, without affecting the movement of the detection device.

[0015] Conductor 6 is made of marine-grade corrosion-resistant cable with a cross-sectional area of ​​1.5 mm². Its surface is covered with a wear-resistant and corrosion-resistant polyvinyl chloride (PVC) layer. The length of conductor 6 is selected based on the height of the offshore wind power platform, typically ranging from 50m to 100m. The connection points between conductor 6 and the reference electrode 8 and multimeter 2 utilize waterproof sealed joints with an IP68 sealing rating to prevent seawater intrusion and subsequent poor contact.

[0016] The automatic length calculation device for conductor 6 uses an encoder-type length measuring instrument, such as the Kübler Group brand: D125 wire encoder. The measuring length covers 6m to 10m, meeting the requirements for conductor length detection in short-to-medium height wind power platforms (such as pile foundations below 30m). It works in conjunction with the conductor 6 laying mechanism, achieving a measurement accuracy of ±0.5cm. It can collect the laying length data of conductor 6 in real time and automatically set the laying length of the next section of conductor 6 through a built-in controller. The controller uses a PLC controller, model S7-200, which can be linked with the power supply control module to achieve automatic energization control of the electromagnet 7.

[0017] The orientation calibration module is integrated into the PLC controller. It stores the detection position data of the first orientation through a preset program, and then calculates the detection position coordinates of other orientations based on the circumference of the offshore wind turbine foundation, ensuring that the detection points of each orientation are evenly distributed.

[0018] The specific operation of the detection method in this embodiment is as follows: At the cage platform 4 of the offshore wind power platform, the operator lowers the reference electrode 8 and the electromagnet 7 together into the seawater below the sea level 5. The automatic length calculation device for the conductor 6 is activated, and the initial placement length of the conductor 6 is obtained in real time and displayed on the operation panel.

[0019] The operator sets the height interval between adjacent detection points to 1m according to the detection requirements. The automatic length calculation device for conductor 6 automatically sets the target placement length of the next section of conductor 6 based on the initial placement length. The automatic placement device for conductor 6 controls the precise placement of conductor 6. When conductor 6 reaches the target position, the automatic length calculation device for conductor 6 sends a positioning signal.

[0020] The control module of the power supply is triggered by the arrival signal. The power supply is the electromagnet 7. The electromagnet 7 generates magnetism and is attracted to the steel structure surface of the offshore wind turbine pile foundation. After the attraction is stable (usually 3 seconds), the operation panel displays the "Measurable" prompt.

[0021] The operator reads the potential value displayed by the multimeter 2 and records the location and orientation information of the detection point.

[0022] After the detection point is completed, the operator presses the power-off button, the power is cut off, the electromagnet 7 loses its magnetism and remains vertical under the action of gravity. The automatic calculation device for the length of the wire 6 automatically sets the placement length of the wire 6 for the next detection point. Repeat steps 2)-4) to complete the potential detection of the six detection points in this position in sequence.

[0023] After one azimuth detection is completed, the azimuth calibration module automatically calculates and calibrates the detection position of the second azimuth based on the detection position data of the first azimuth. The operator moves the detection device to the second azimuth and repeats steps 1)-5) to complete the detection work of three different azimuths in sequence, and finally obtains the all-round sacrificial anode potential data of the offshore wind turbine pile foundation.

[0024] When tested using the apparatus and method of this embodiment, the reference electrode 8 can always remain vertically downward, the distance error between it and the steel structure surface is controlled within ±2cm, the error in the placement length of the wire 6 is controlled within ±0.5cm, and the orientation positioning error is controlled within ±1°. The accuracy and reliability of the test results are significantly better than those of traditional test methods.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A reliable detection device for sacrificial anode potential in offshore wind power based on the principle of electromagnetism, characterized in that, It includes a reference electrode, a multimeter, a wire, an electromagnet, an automatic wire length calculation device, and a power supply; the reference electrode is connected to the multimeter via a wire, the electromagnet is positioned close to the reference electrode, the automatic wire length calculation device works with the wire to obtain the placement length of the wire, and the power supply is electrically connected to the electromagnet to control the on / off state of the electromagnet.

2. The offshore wind power sacrificial anode potential reliable detection device based on the electromagnet principle as described in claim 1, characterized in that, The electromagnet has a preset weight, which can withstand the impact of seawater flow and keep the reference electrode vertically downward under the action of gravity.

3. The offshore wind power sacrificial anode potential reliable detection device based on the electromagnet principle as described in claim 1, characterized in that, The automatic conductor length calculation device can automatically set the placement length of the next conductor segment and is linked to the power supply for control.

4. The offshore wind power sacrificial anode potential reliable detection device based on the electromagnet principle as described in claim 1, characterized in that, It also includes a azimuth calibration module, which can calculate and calibrate the detection positions of other azimuths based on the detection position of one azimuth.

5. The offshore wind power sacrificial anode potential reliable detection device based on the electromagnet principle as described in claim 1, characterized in that, The surface of the reference electrode's wire is provided with a wear-resistant and corrosion-resistant layer, and the connection between the wire and the reference electrode and the multimeter is provided with a sealing structure.

6. A reliable detection method for sacrificial anode potential in offshore wind power based on the principle of electromagnetism, characterized in that, Includes the following steps: Step 1. Lower the reference electrode of the detection device and the electromagnet into the seawater together, and obtain the initial wire placement length through the wire length automatic calculation device; Step 2. The automatic wire length calculation device sets the target placement length of the next wire segment based on the initial placement length and controls the wire to be lowered to the target position; Step 3. Turn on the power supply to energize the electromagnet, so that the electromagnet becomes magnetic and attracts to the steel structure surface of the offshore wind turbine pile foundation; Step 4. After the electromagnet has stabilized, use a multimeter to measure the potential between the reference electrode and the steel structure. Step 5. After the test is completed, cut off the power to make the electromagnet lose its magnetism, and repeat steps 2)-4) to detect the potential at different height positions; Step 6. Using the first orientation as a reference, use the orientation calibration module to calibrate the detection positions in other orientations. Repeat steps 1)-5) in different orientations to complete the all-round detection.

7. A reliable detection method for sacrificial anode potential in offshore wind power based on the principle of electromagnets as described in claim 6, characterized in that, In step 1), the reference electrode and the electromagnet are lowered synchronously, and the weight of the electromagnet keeps the reference electrode in a vertically downward position.

8. A reliable detection method for sacrificial anode potential in offshore wind power based on the principle of electromagnets as described in claim 6, characterized in that, In step 3), after the automatic wire length calculation device confirms that the wire has reached the target position, it sends a trigger signal to the power supply, and the power supply automatically energizes the electromagnet.

9. A reliable detection method for sacrificial anode potential in offshore wind power based on the principle of electromagnets as described in claim 6, characterized in that, In step 5), the height interval of each test is precisely controlled by the automatic wire length calculation device, and the height interval of adjacent test points is consistent.

10. A reliable detection method for sacrificial anode potential in offshore wind power based on the principle of electromagnetism as described in claim 6, characterized in that, In step 6), after completing the potential detection of at least six detection points in each orientation, the system switches to the next orientation for calibration detection.

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