Wind energy cable test method and device

Abstract

The invention relates to a wind energy cable testing method and device, and the method comprises the steps: selecting a section of wind energy cable, removing the covering of two ends of the wind energy cable, and exposing the two ends of a conductor; lifting the first end of the conductor to a set height, and leaving the second end of the conductor from the ground; applying a downward pulling force to the second end of the conductor; and testing the performance of the wind energy cable. By fixing a cable carrying route and connecting the cable with the lifting motor, one-key starting ascending and descending are achieved, potential safety hazards of cable carrying by personnel are reduced, time-consuming and labor-consuming carrying by multiple persons is converted into cable carrying by one person independently, the test efficiency is improved, waste of human resources in the carrying process is reduced, and the labor intensity of workers is reduced. And the possible risk that the cable falls off and is injured in the fixing process of experimenters is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power cable testing, and in particular to a wind power cable testing method and equipment. Background Art

[0002] The main function of wind power cables is to transform the low-frequency AC power generated by the generator into DC power through rectification, and then transform it into AC power with the same frequency, amplitude and phase as the power grid through DC / AC inverter, and finally connect it to the power grid through the box transformer to complete the task of transmitting electricity to the power grid. Wind power cables are generally laid in towers and are suspended inside the towers for a long time. The load test simulates the long-term suspension of the cable, and observes whether the cable has cracks on its appearance and whether the conductor resistance meets the requirements. In general, the existing detection methods have the following defects:

[0003] During the test, the cable needs to be transported to a high place and hung. The transportation process requires the cooperation of multiple people, which is time-consuming and labor-intensive. It is a waste of transportation and human resources, and there is a risk of people being injured due to improper transportation or improper fixation of the sample.

[0004] Therefore, it is necessary to provide a wind power cable testing method and equipment that facilitates cable handling, reduces safety hazards of personnel handling cables, and improves work efficiency. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a wind power cable testing method and equipment.

[0006] The technical solution of the present invention is as follows:

[0007] A wind power cable testing method, comprising:

[0008] S1: Select a section of wind power cable, remove the coverings at both ends of the wind power cable and expose both ends of the conductor;

[0009] S2: hoist the first end of the conductor to a set height, and the second end of the conductor is off the ground;

[0010] S3: applying a downward pulling force to the second end of the conductor;

[0011] S4: Test the performance of wind power cables.

[0012] As a further improvement of the present invention, a step SA is provided between step S2 and step S3: measuring the cross-sectional area of ​​the conductor and calculating the pulling force value on the conductor.

[0013] As a further improvement of the present invention, the cross-sectional area of ​​the conductor is S, in units of mm 2 , the tension value is F, in N, satisfying:

[0014] F=S*15.

[0015] As a further improvement of the present invention, the set height is 2-3 m, and the set height is greater than the length of the wind power cable.

[0016] As a further improvement of the present invention, the performance of the wind power cable comprises the resistance of the conductor and the surface appearance of the wind power cable.

[0017] A testing device based on the above-mentioned wind power cable testing method comprises a frame, a lifting assembly arranged on the frame, a detection assembly for testing the wind power cable, and a load assembly for providing tension to the conductor.

[0018] As a further improvement of the present invention, the lifting assembly includes a fixed pulley arranged on the frame, a transmission rope matched with the fixed pulley, and a lifting motor driving the transmission rope to lift and lower.

[0019] As a further improvement of the present invention, the detection assembly includes a resistance measuring device and an infrared device, and two electrode clamps of the resistance measuring device clamp the first end and the second end of the conductor respectively.

[0020] As a further improvement of the present invention, the load assembly includes a clamp for clamping the conductor, a driving member for driving the clamp to pull down, and a control panel electrically connected to the driving member, and the control panel sets the pulling force value of the clamp on the conductor.

[0021] As a further improvement of the present invention, the testing equipment also includes a controller and a display. The lifting component, the detection component, the load component and the display are all electrically connected to the controller. The controller controls the operation of the lifting component, the detection component and the load component respectively and feeds back the setting parameters and detection data to the display.

[0022] According to the present invention of the above scheme, the beneficial effects of the present invention are:

[0023] 1. The present invention fixes the cable handling route, connects the cable to the lifting motor, realizes one-button start of ascending and descending, reduces the potential safety hazard of personnel carrying cables, and transforms the time-consuming and labor-intensive cable handling by multiple people into one person alone, thereby improving the test efficiency, reducing the waste of human resources in the handling process, and reducing the risk of cable falling off and being injured by the experimenter during the fixing process;

[0024] 2. The present invention eliminates the weight counterweight method in terms of load. By importing the weight counterweight calculation formula into the control panel and directly inputting the cross-sectional area of ​​the sample into the control panel, the fixture automatically applies a constant force to the lower end of the wind power cable, reducing the operational inconvenience caused by the load and weight configuration;

[0025] 3. The present invention adds an infrared device for real-time scanning in the observation of the cable surface state, and the test is stopped when cracks are found on the surface.

[0026] 4. The present invention adds a controller and a display, which can monitor the resistance in a vertical hanging state in real time, monitor the change of the conductor resistance of the cable in a hanging state in real time, and improve the accuracy and reliability of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a flow chart of a first embodiment of the present invention;

[0028] Figure 2 is a flow chart of a second embodiment of the present invention;

[0029] Figure 3 It is a schematic diagram of the structure of the present invention;

[0030] Figure 4 It is a structural schematic diagram of the load component of the present invention.

[0031] In the figure: 1. Wind power cable; 2. Frame; 3. Fixed pulley; 4. Transmission rope; 5. Lifting motor; 6. Resistance measuring device; 7. Clamp; 8. Driving part; 9. Control panel. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] See also Figure 1 The present invention provides a first embodiment of a wind power cable testing method, the wind power cable testing method comprising:

[0036] S1: Select a section of the wind power cable 1, remove the coverings at both ends of the wind power cable 1 and expose both ends of the conductor;

[0037] S2: hoist the first end of the conductor to a set height, and the second end of the conductor is off the ground;

[0038] Preferably, since the length of the selected wind power cable 1 will not be too long, it is only necessary to satisfy that the lifting height of the first end of the conductor is greater than the length of the wind power cable 1 and the second end of the conductor is off the ground, so that the wind power cable 1 as a whole can be in a suspended state. Therefore, the set lifting height of the first end of the conductor is 2-3m, and the set height is greater than the length of the wind power cable 1. This can not only realize that the wind power cable 1 is in the suspended state required for the test and simulate the working state of the wind power cable 1, but also effectively control the lifting height to avoid unnecessary influence caused by lifting the wind power cable 1 too high, and at the same time can also improve a certain test safety and reduce safety risks;

[0039] S3: applying a downward pulling force to the second end of the conductor;

[0040] S4: Testing the performance of the wind power cable 1 . Preferably, the performance test includes the resistance of the conductor and the surface appearance of the wind power cable 1 .

[0041] The present invention simulates the working environment of the wind power cable 1 being suspended inside the tower for a long time by hanging the wind power cable 1, highly restores the working state of the wind power cable 1, and tests the surface appearance and conductor resistance of the wind power cable 1 in this suspended state, effectively improving the accuracy and reliability of the test of the wind power cable 1.

[0042] See also Figure 2 The present invention provides a second embodiment of a wind power cable testing method, the wind power cable testing method comprising:

[0043] S1: Select a section of the wind power cable 1, remove the coverings at both ends of the wind power cable 1 and expose both ends of the conductor;

[0044] S2: hoist the first end of the conductor to a set height, and the second end of the conductor is off the ground;

[0045] SA: Measure the cross-sectional area of ​​the conductor and calculate the pulling force on the conductor;

[0046] Preferably, the cross-sectional area of ​​the conductor is S, in mm 2 , the tension value is F, the unit is N, and it satisfies:

[0047] F = S * 15;

[0048] S3: applying a downward pulling force to the second end of the conductor;

[0049] S4: Testing the performance of the wind power cable 1 .

[0050] The present invention calculates the tension value of the conductor by measuring the cross-sectional area of ​​the conductor, and can design respective suitable tension values ​​for wind power cables 1 of different sizes, thereby increasing the overall applicable scope and further improving the accuracy and reliability of the test of the wind power cable 1.

[0051] See also Figure 3 The present invention provides a test device applying the above-mentioned wind power cable test method, comprising a frame 2, a lifting component arranged on the frame 2, a detection component for testing the wind power cable 1, and a load component for providing tension to the conductor. Preferably, the detection component comprises a resistance measuring device 6 and an infrared device. The two electrode clamps of the resistance measuring device 6 respectively clamp the first end and the second end of the conductor. One end of the wind power cable 1 is lifted by the lifting component so that the wind power cable 1 is in a suspended state as a whole, and a downward pulling force is applied to the conductor in the wind power cable 1 by the load component, which can highly simulate the working state of the wind power cable 1 in normal operation. Then, the detection component is used to test the surface appearance of the wind power cable 1 and the resistance of the conductor, which can effectively improve the accuracy and reliability of the test.

[0052] As an embodiment of the present invention, the lifting assembly includes a fixed pulley 3 arranged on a frame 2, a transmission rope 4 coordinated with the fixed pulley 3, and a lifting motor 5 for driving the transmission rope 4 to lift and lower. During testing, the lifting motor 5 is first controlled to drive the transmission rope 4 to be lowered, and the tester connects the first end of the wind power cable 1 to the transmission rope 4, and then controls the lifting motor 5 to drive the transmission rope 4 to rise to a set height. This structure can realize the transportation and lifting of the wind power cable 1 by one person alone, which can not only improve work efficiency, but also effectively reduce the number of testers and effectively reduce work intensity. At the same time, it can also effectively avoid the risk of testers being injured due to improper transportation or improper fixation of the wind power cable 1, thereby improving test safety.

[0053] See also Figure 4 As an embodiment of the present invention, the load assembly includes a clamp 7 for clamping the conductor, a driving member 8 for driving the clamp 7 to pull down, and a control panel 9 electrically connected to the driving member 8. The control panel 9 sets the pulling force of the clamp 7 on the conductor. In conventional counterweight tests, this is often achieved by increasing or decreasing the weight of the weight. However, according to the calculation formula of the load weight F=S*15N, since the cross-sectional area of ​​the wind power cable 1 is large, it is usually greater than 240mm 2 , that is, the load weight is greater than 3600N, so the required loading weight is large, and the weight is a precision instrument, and the configuration, maintenance and fixation are relatively complicated, and the operation is not convenient. The present invention adopts a clamp 7 with adjustable tension value to replace the weight. The operator imports the calculation formula of the counterweight on the control panel 9, and directly inputs the cross-sectional area of ​​the wind power cable 1 on the control panel 9, so as to appropriately adjust the tension value of the clamp 7. The driving member 8 can automatically drive the clamp 7 to apply a constant force to the wind power cable 1, thereby solving the inconvenience caused by manually configuring the load with weights, and can effectively improve work efficiency. In addition, when the test is completed, the tension value of the clamp 7 is adjusted again through the control panel 9, so that the tension applied by the clamp 7 to the wind power cable 1 is 0, which saves the step of the tester removing the load, further improves the work efficiency, and also avoids the accidents and risks that may occur to the tester when removing the load, thereby improving the safety and reliability of the work.

[0054] As an embodiment of the present invention, the test equipment also includes a controller and a display. The lifting component, the detection component, the load component and the display are all electrically connected to the controller. The controller controls the operation of the lifting component, the detection component and the load component respectively and feeds back the setting parameters and the detection data to the display. The tester can operate and control the entire set of test equipment through the controller, which is simple and convenient. The relevant setting parameters of the lifting component and the load component can be displayed on the display. The tester can control and adjust the setting parameters in real time. If the parameter setting is wrong, it can be discovered and modified in time to avoid unnecessary impact on the test results due to the error in setting the parameters. At the same time, the monitoring data of the detection component can also be fed back to the display in real time, and the resistance change of the wind power cable 1 can be monitored in real time to improve the accuracy and reliability of the test. When cracks are detected on the surface of the wind power cable 1, the detection personnel can know and end the test in the first time, which improves the safety and stability of the test.

[0055] As an embodiment of the present invention, the first end of the conductor is provided with an upper clamp and an electric motor, and the transmission rope is connected to the upper clamp. When the wind power cable 1 needs to be lifted, the electric motor drives the upper clamp to automatically clamp. Compared with the conventional fixing method of copper nose crimping, the cooperation of the electric motor and the upper clamp can reduce the copper nose not being pressed tightly during the operation of the tester, causing the wind power cable 1 to fall off, affecting the test results and test safety performance, and is convenient for the tester to operate and improve work efficiency.

[0056] Workflow: The operator controls the lifting motor 5 through the button on the controller to lower the transmission rope 4, removes the coverings at both ends of the wind power cable 1 to expose the conductor, places the first end of the conductor on the upper clamp, starts the electric motor to drive the upper clamp to clamp, clamps the two electrode clamps of the resistance measuring device 6 at the two ends of the conductor respectively, and clamps the clamp 7 at the second end of the conductor. The operator controls the lifting motor 5 to raise the transmission rope 4 and lift the wind power cable 1 to the set height. The operator inputs the cross-sectional area of ​​the wind power cable 1 into the control panel 9, and the driving part 8 automatically drives the clamp 7 to apply a constant force to the wind power cable 1. The resistance measuring device 6 and the infrared device are started to detect the wind power cable 1. The operator records and analyzes the results displayed on the display.

[0057] In summary, the present invention provides a wind power cable testing method and equipment, which simulates the working environment of the wind power cable 1 being suspended inside the tower for a long time by hanging the wind power cable 1, highly restores the working state of the wind power cable 1, and tests the surface appearance and conductor resistance of the wind power cable 1 in this suspended state, effectively improving the accuracy and reliability of the wind power cable 1 test; by measuring the cross-sectional area of ​​the conductor to calculate the tension value on the conductor, it is possible to design respective suitable tension values ​​for wind power cables 1 of different sizes, thereby improving the overall applicable scope and further improving the accuracy and reliability of the wind power cable 1 test; the fixed pulley 3 is adopted to realize the transportation and lifting of the wind power cable 1 by one person alone, which can not only improve the work efficiency, but also effectively reduce the number of testers, effectively reduce the work intensity, and also effectively avoid the wind power cable 1 being damaged due to improper transportation or The risk of test personnel being injured by improper fixation is improved, and the test safety is improved; the use of a clamp 7 with adjustable tension value instead of weights can solve the inconvenience caused by manually configuring the load with weights, can effectively improve work efficiency, and saves the step of test personnel removing the load, further improving work efficiency, while also avoiding accidents and risks that may occur when the test personnel remove the load, and improving work safety and reliability; the test personnel can operate and control the entire set of test equipment through the controller, which is simple and convenient, and the relevant setting parameters of the lifting component and the load component can be displayed on the display, the test personnel can control and adjust the setting parameters in real time, avoiding unnecessary influence on the test results due to errors in setting parameters; at the same time, the monitoring data of the detection component can also be fed back to the display in real time, improving the accuracy and reliability of the test, and the safety and stability of the test.

[0058] It should be emphasized that the above are only preferred embodiments of the present invention and do not limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A wind power cable testing method, characterized in that: include: S1: Select a section of a wind power cable (1), remove covers at both ends of the wind power cable (1) and expose both ends of the conductor; S2: hoist the first end of the conductor to a set height, and the second end of the conductor is off the ground; S3: applying a downward pulling force to the second end of the conductor; S4: Testing the performance of the wind power cable (1).

2. The wind power cable testing method according to claim 1, characterized in that: A step SA is provided between step S2 and step S3: measuring the cross-sectional area of ​​the conductor and calculating the pulling force value on the conductor.

3. The wind power cable testing method according to claim 2, characterized in that: The cross-sectional area of ​​the conductor is S, in mm 2 , the tension value is F, in N, satisfying: F=S*15.

4. The wind power cable testing method according to claim 1, characterized in that: The set height is 2-3 m, and the set height is greater than the length of the wind power cable (1).

5. The wind power cable testing method according to claim 1, characterized in that: The properties of the wind power cable (1) include the resistance of the conductor and the surface appearance of the wind power cable (1).

6. A testing device based on the wind power cable testing method according to any one of claims 1 to 5, characterized in that: It comprises a frame (2), a lifting component arranged on the frame (2), a detection component for testing the wind power cable (1), and a load component for providing a pulling force to the conductor.

7. The testing device according to claim 6, characterized in that The lifting assembly comprises a fixed pulley (3) arranged on the frame (2), a transmission rope (4) matched with the fixed pulley (3), and a lifting motor (5) for driving the transmission rope (4) to rise and fall.

8. The testing device according to claim 6, characterized in that The detection assembly comprises a resistance measuring device (6) and an infrared device, and two electrode clamps of the resistance measuring device (6) clamp the first end and the second end of the conductor respectively.

9. The testing device according to claim 6, characterized in that The load assembly comprises a clamp (7) for clamping the conductor, a driving member (8) for driving the clamp (7) to pull down, and a control panel (9) electrically connected to the driving member (8), wherein the control panel (9) sets the pulling force value of the clamp (7) on the conductor.

10. The testing device according to claim 6, characterized in that The testing equipment also includes a controller and a display. The lifting component, the detection component, the load component and the display are all electrically connected to the controller. The controller controls the operation of the lifting component, the detection component and the load component respectively and feeds back the setting parameters and detection data to the display.

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