Remote detection device for shaft voltage of wind power step-up gearbox

Abstract

The utility model relates to the technical field of wind power generation, and discloses a wind power step-up gearbox shaft voltage remote detection device which comprises a detection mechanism, the detection mechanism comprises a carbon brush, a remotely controlled oscilloscope, and a grounding probe and an input probe which are connected to the oscilloscope, and the carbon brush is arranged at a sun gear spline shaft and detachably fixed on a box body. The carbon brush is contacted with the periphery of the sun gear spline shaft, one end of the carbon brush is grounded with the grounding probe, and the other end is connected with the oscilloscope input probe; the length of the wire between the oscilloscope and the carbon brush is not less than 20m. According to the scheme, the shaft voltage of the offshore wind turbine can be accurately and effectively detected, and the early warning function is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to wind power generation technical field, concretely relates to a wind power speed increasing gear box shaft voltage remote detection device. BACKGROUND

[0002] The wind power speed increasing gear box is an important mechanical component of offshore wind power generation, and its main function is to transmit the power generated by the blade under the action of wind to the generator and make it obtain corresponding rotating speed.

[0003] In addition, the shaft voltage is also generated by the generator inverter power supply, static charge and other external causes, and the shaft voltage generated by the generator is about 1-2V. If the closed loop is formed with the shaft bearing on both sides, the shaft current will be generated. If the shaft current exists between the bearing end or the rotating shaft and the bearing, the shaft will be corroded, and the service life of the bearing is greatly shortened. Therefore, the shaft voltage value detection device research has important engineering practical significance for determining whether the shaft voltage is caused by the generator and preventing it as soon as possible. However, the offshore wind turbine is far away from the land, and the offshore operation environment is poor, so the detection personnel have great difficulty in operation, and the detection process is very inconvenient. CONTENT OF UTILITY MODEL

[0004] The utility model intends to provide a kind of wind power speed increasing gear box shaft voltage remote detection device, to solve the inconvenient problem of the shaft voltage detection of offshore wind turbine.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: a kind of wind power speed increasing gear box shaft voltage remote detection device, including detection mechanism, detection mechanism includes carbon brush, remote controlled oscilloscope and the ground probe and input probe connected on the oscilloscope, carbon brush is set at sun gear spline shaft and can be detachably fixed on the box, carbon brush is contacted with the outer periphery of sun gear spline shaft, carbon brush one end is grounded with ground probe, and the other end is connected with the input probe of oscilloscope;The length of wire between oscilloscope and carbon brush is not less than 20m.

[0006] The principle and advantages of the present scheme are as follows:

[0007] 1. In actual application, to detect whether the shaft voltage is caused by the generator, the most accurate and real measurement point is the shaft of the generator and its adjacent bearing, but this measurement point cannot be measured, therefore, the carbon brush is arranged at the sun gear spline shaft, the sun gear spline shaft is a common shaft of the speed increasing gear box and the generator, the sun gear spline shaft and the generator rotor are assembled integrally and regarded as a potential body, the rotating potential of the sun gear spline shaft is led out through the carbon brush for voltage detection, which can maximize the accuracy and accuracy of the detection results.

[0008] 2. The detection object of the scheme is an offshore wind turbine, compared with the onshore wind turbine, the operating environment of the offshore wind turbine is more severe, and it is difficult to detect by using the onshore generator detection method, in the scheme, the oscilloscope is connected with the carbon brush to output and display the voltage information, under normal environmental conditions, when the oscilloscope is connected with the measured object for data output, in order to reduce transmission loss, the distance between them is as close as possible, but in the scheme, the oscilloscope cannot be fixed on the offshore wind turbine, and in order to ensure the safety of the detection workers, the oscilloscope is externally installed through a long distance wire, the length of the wire is not less than 20m in the scheme, which not only realizes safe detection, but also facilitates maintenance personnel to timely repair and maintain if the oscilloscope has problems or faults, thereby ensuring the reliability of the generator shaft voltage monitoring and avoiding excessive corrosion of the shaft voltage on the shaft, which affects the productivity of the generator.

[0009] Further, the carbon brush comprises a copper handle and a carbon fiber brush fixed in the copper handle, the end of the carbon fiber brush is arc-shaped, and the minimum distance between the edge of the arc-shaped end of the carbon fiber brush and the outer periphery of the sun gear spline shaft is not more than 2mm.

[0010] Further, the plurality of carbon brushes are a group, and there are multiple groups, and the multiple groups of carbon brushes are evenly distributed around the sun gear spline shaft.

[0011] Further, a brush holder is arranged between the carbon brush and the box body, the brush holder is fixed on the box body, a U-shaped hole is opened on the brush holder, and the copper handle of the carbon brush is fixed by being inserted into the U-shaped hole.

[0012] Further, a wiring hole is opened at the end of the copper handle of the carbon brush, a wiring terminal is arranged at the end of the wire, and the wiring hole is used for accommodating the wiring terminal.

[0013] Further, the cross-sectional area of the wire between the carbon brush and the oscilloscope is not less than 2.5mm 2 .

[0014] Further, the model of the oscilloscope is 6500H.

[0015] Further, a controlled unit and an operation unit are further included, the controlled unit is in communication connection with the oscilloscope, the operation unit remotely controls the controlled unit, and the operation unit remotely controls the oscilloscope through the controlled unit.

[0016] Due to the harsh marine environment, workers on the tower cannot continue working at sea after the generator starts generating electricity. In this solution, the detection mechanism is connected and fixed, and the voltage data received by the oscilloscope is recorded and collected through the controlled unit and the operating unit. Remote control testing is realized, eliminating the need for testing personnel to work in harsh conditions. Moreover, compared with the offline detection method of existing shaft voltage detection devices, this solution tests the shaft voltage during the actual operation of the generator, resulting in higher data accuracy and more reliable early warning. Attached Figure Description

[0017] Figure 1 This is a structural block diagram of an embodiment of the present utility model.

[0018] Figure 2 This is a simplified diagram showing the relationship between the carbon brush and the rotating shaft in an embodiment of this utility model.

[0019] Figure 3 This is a simplified structural diagram of the brush holder and carbon brush according to an embodiment of the present invention. Detailed Implementation

[0020] The following detailed description illustrates the specific implementation method:

[0021] The reference numerals in the accompanying drawings include: carbon brush 1, copper handle 11, brush 12, oscilloscope 2, controlled unit 3, operating unit 4, brush holder 5, U-shaped hole 6, and wiring hole 7.

[0022] Example

[0023] The basics are as follows: Figures 1-3 The device illustrates a remote detection device for the shaft voltage of a wind turbine gearbox. It includes a detection mechanism comprising a carbon brush 1, a remotely controlled oscilloscope 2, and a grounding probe and an input probe connected to the oscilloscope 2. The carbon brush 1 is located at the sun gear spline shaft and is detachably fixed to the housing. The carbon brush 1 contacts the outer circumference of the sun gear spline shaft. One end of the carbon brush 1 is grounded to the grounding probe, and the other end is connected to the input probe of the oscilloscope 2. The wire between the oscilloscope 2 and the carbon brush 1 is 20-40m long, with a cross-sectional area of ​​not less than 2.5mm². 2 To prevent current overload from affecting the test results, and secondly, since oscilloscope 2 cannot be fixed on the offshore wind turbine, and to ensure the safety of the testing and construction personnel, oscilloscope 2 is externally installed through a long-distance cable. This not only enables safe testing, but also facilitates timely repair and maintenance by maintenance personnel if there are any problems or malfunctions with oscilloscope 2, thereby ensuring the reliability of generator shaft voltage monitoring.

[0024] Combination Figure 2As shown, the carbon brush 1 includes a copper handle 11 and a carbon fiber brush 12 fixed in the copper handle 11, the end of the carbon fiber brush 12 is arc-shaped, and the arc-shaped end is pressed to contact the surface of the shaft. Compared with the rectangular block carbon brush 1, the brush type carbon brush 1 reduces the matching process, reduces the detection period and cost during use. Preferably, the distance L between the edge of the arc-shaped end of the carbon fiber brush 12 and the outer periphery of the sun gear spline shaft is 1-2mm, and the reason for such design is:

[0025] On the one hand, in the actual detection process, the distance L initially set by the detection personnel is 3-4mm, the contact area between the arc-shaped end of the brush 12 of the carbon brush 1 and the outer periphery of the sun gear spline shaft is reduced, and after running for a period of time, the end of the carbon brush 1 is deformed due to wear, the carbon brush 1 cannot contact the rotating shaft, and the rotating shaft cannot be accurately tested. The voltage, for example, the actual shaft voltage of a certain generator set rotating shaft has exceeded 2V, but the detection voltage is lower than 2V, which will lead to the detection personnel to make a wrong judgment on the detection of the generator set, and the rotating shaft will continue to be corroded in the subsequent running process, greatly reducing its service life; if the detection structure reliability needs to be ensured, the operator needs to frequently adjust the position of the carbon brush 1, but the offshore environment is harsh, and the detection or maintenance cost will increase significantly; on the other hand, if the distance is set to be less than 1mm, the end of the brush 12 of the carbon brush 1 will be excessively deformed due to space problems, although the contact between the rotating shaft and the carbon brush 1 is good, but the brush 12 part of the carbon brush 1 will be excessively deformed and cannot be restored after a long time of running, the carbon brush 1 cannot be used repeatedly, resulting in increased detection cost; the present scheme limits the above distance to 1-2mm, which can ensure the contact accuracy of the carbon brush 1 and the rotating shaft, ensure the reliability of the detection result, and does not need to frequently adjust the position due to wear and deformation after a long time of use and has low deformation degree, so that the carbon brush 1 can be repeatedly used and the enterprise cost is saved.

[0026] The carbon brush 1 and the box body are provided with a brush holder 5, and the brush holder 5 is provided with a U-shaped hole 6. Figure 3 As shown, the brush holder 5 is rectangular and is bolted on the box body, the brush holder 5 is provided with a U-shaped hole 6, the copper handle of the carbon brush 1 is inserted into the U-shaped hole 6 for interference fit, the end of the copper handle 11 of the carbon brush 1 is provided with a wire connecting hole 7, the end of the wire is provided with a wire terminal, the wire terminal is in the form of a circular ring sheet, the wire connecting hole 7 is used to accommodate the wire terminal, and during installation, the wire terminal is aligned with the wire connecting hole 7, then a bolt is inserted into the wire connecting hole 7 for tightening to realize the installation and fixation of the wire, which is simple in structure, convenient to install and low in subsequent maintenance cost.

[0027] The plurality of carbon brushes 1 are in a group, the number is multiple groups, the plurality of carbon brushes 1 are evenly distributed around the sun gear spline shaft in a ring shape, in the embodiment, one group includes 4-5 carbon brushes 1 arranged in parallel in series, there are four groups in total, and the two adjacent groups of carbon brushes 1 are 90° apart; such arrangement is to ensure the contact reliability between the carbon brush 1 and the measured rotating shaft, and if one of the carbon brushes 1 fails to contact, there is a backup option to ensure the accuracy and reliability of the detection; on the other hand, the number of carbon brush groups should not be too large, too many groups will not only interfere with the internal structure of the generator itself, but also make some carbon brushes 1 idle, increasing the cost.

[0028] Through the above arrangement, on the one hand, to detect whether the shaft voltage is caused by the generator, the most accurate and real measurement point position is the generator shaft and its adjacent bearing, but this measurement point position cannot be measured, therefore, the carbon brush 1 is arranged at the sun gear spline shaft in the scheme, the sun gear spline shaft is a common shaft of the speed increasing gear box and the generator, the sun gear spline shaft and the generator rotor are assembled as a whole and are regarded as a potential body, the rotating potential of the sun gear spline shaft is led out by the carbon brush 1 for voltage detection, which can maximize the accuracy and accuracy of the detection result.

[0029] On the other hand, the detection object of the scheme is an offshore wind turbine, compared with a land-based wind turbine, the operating environment of the offshore wind turbine is more severe, and it is difficult to detect using a land-based generator detection method, in the scheme, the oscilloscope 2 is connected to the carbon brush 1 to output and display the voltage information, under normal environmental conditions, when the oscilloscope 2 is connected to the measured object for data output, in order to reduce transmission loss, the distance between the two is as close as possible, but in the scheme, the oscilloscope 2 cannot be fixed on the offshore wind turbine, and in order to ensure the safety of the detection workers, the oscilloscope 2 is installed by long distance wire, the length of the wire is not less than 20m in the scheme, which not only realizes safe detection, but also facilitates maintenance personnel to timely repair and maintain if the oscilloscope 2 has problems or faults, thereby ensuring the reliability of the generator shaft voltage monitoring, avoiding excessive corrosion of the shaft voltage on the rotating shaft, and affecting the productivity of the generator.

[0030] In combination Figure 1As shown, the remote detection device of the present solution further comprises a controlled unit 3 and an operation unit 4, the controlled unit 3 is in communication connection with the oscilloscope 2, including wireless connection and wired connection, the controlled unit 3 is used for collecting data of the oscilloscope 2, and the operation unit 4 remotely controls the controlled unit 3; the controlled unit 3 is installed with parameter adjustment software for adjusting parameters of the oscilloscope 2 and interface control software for controlling the interface of the oscilloscope 2, the parameter adjustment software and the interface control software are existing software, such as Ultra Sigma, Ultra Scope and the like; the controlled unit 3 and the operation unit 4 are both installed with remote control software, the remote control software is existing software, such as sunflower software; the controlled unit 3 comprises a desktop computer and a notebook computer, and the operation unit 4 comprises a control computer and a terminal server, whether the control computer or the terminal server is used for controlling the controlled unit 3; the controlled unit 3 collecting data of the oscilloscope 2 and the operation unit 4 remotely controlling the controlled unit 3 can both be realized by existing technology, and the present solution will not be described in detail for the existing software or the existing technology.

[0031] In an embodiment, the controlled unit 3 is a notebook computer, and the operation unit 4 is a control computer, and the detection personnel carries the notebook computer to maintain and detect the oscilloscope 2 when going to the sea for detection. The notebook computer and the oscilloscope 2 are in wireless connection, and the notebook computer and the control computer can be in remote wireless connection or wired connection.

[0032] In an embodiment, the controlled unit 3 is a desktop computer, and the operation unit 4 is a terminal server. The desktop computer is used for remote monitoring, and the terminal server is used for remotely controlling the desktop computer. The desktop computer can be in wireless connection with the oscilloscope 2 or in wired connection. The terminal server is in remote wired connection with the desktop computer.

[0033] Preferably, in the present embodiment, the oscilloscope 2 is of type 6500H, compared with other types of oscilloscopes 2, the oscilloscope 6500H can be controlled and adjusted by inserting a programming program, can display a waveform function in real time on a computer desktop of the controlled unit 3, or can filter in data of the oscilloscope 2 through a program code to obtain required data, such as statistical peak-to-peak value, reading of duty cycle, reading of rise time and the like.

[0034] The specific implementation process is as follows:

[0035] In the specific detection, the carbon brush 1 is in contact with the measured rotating shaft of the wind power speed increasing gearbox and is fixed in position, the ground probe of the oscilloscope 2 is grounded with one end of the carbon brush 1, and the other end of the carbon brush 1 is connected with the input probe of the oscilloscope 2. In order to avoid a large peak value in the offshore test site, the oscilloscope 2 is broken down, the pen amplification multiple of the oscilloscope 2 needs to be adjusted to 50 times, and the gear position needs to be adjusted to 300V. In the specific implementation process, the controlled unit 3 is a notebook computer, the operation unit 4 is a control computer, the notebook computer and the oscilloscope 2 are in communication through a USB, and the notebook computer and the control computer are connected through a wireless network; the notebook computer is installed with software Ultra Sigma for adjusting the parameters of the oscilloscope 2, software Ultra Scope for controlling the interface of the oscilloscope 2, and the notebook computer and the control computer are both installed with remote control software, and the remote control software is an existing software, such as Sunflower software, the control computer can enter the desktop of the notebook computer through the Sunflower software, and all operations of the oscilloscope 2 can be controlled, and the test waveform is saved through screen recording and then data saving; in addition, the notebook computer can also be controlled through the network cable to configure an IP address, and at this time, the Sunflower software is not needed. Through the two networking modes of the wireless network and the network cable, two optional remote control modes are provided, and personnel are not needed to collect data on site.

[0036] The whole embodiment avoids complex on-site installation by adopting the carbon brush 1, the oscilloscope 2, the electric wire, the controlled unit 3 and the operation unit 4, realizes simple hardware structure, convenient packaging, carrying and installation and simple troubleshooting, the oscilloscope 2 measures voltage based on the voltage comparison technology and converts the voltage into a waveform image, through the controlled unit 3 and the operation unit 4, the tester can remotely debug the equipment and remotely process the collected waveform and data at the same time, the whole detection device is convenient to install and debug, has low maintenance cost, can store data in real time, realizes remote testing research of the shaft voltage of the wind power speed increasing gearbox, and can be widely applied to the shaft voltage testing enterprises and engineering projects of the wind power speed increasing gearbox.

[0037] The above is only an embodiment of the present application, and the known specific technical solutions and / or common knowledge of characteristics in the scheme are not described in detail. It should be noted that, for those skilled in the art, without departing from the technical scheme of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. A remote detection device for the shaft voltage of a wind turbine speed-increasing gearbox, characterized in that: The testing mechanism includes a carbon brush, a remotely controlled oscilloscope, and a grounding probe and an input probe connected to the oscilloscope. The carbon brush is located at the sun gear spline shaft and is detachably fixed to the housing. The carbon brush is in contact with the outer circumference of the sun gear spline shaft. One end of the carbon brush is grounded to the grounding probe, and the other end is connected to the oscilloscope input probe. The length of the wire between the oscilloscope and the carbon brush is not less than 20m.

2. The remote detection device for the shaft voltage of a wind turbine speed-increasing gearbox according to claim 1, characterized in that: The carbon brush includes a copper handle and carbon fiber bristles fixed inside the copper handle. The ends of the carbon fiber bristles are arc-shaped, and the minimum distance between the edge of the arc-shaped end of the carbon fiber bristles and the outer periphery of the sun gear spline shaft does not exceed 2mm.

3. The remote detection device for the shaft voltage of a wind turbine speed-increasing gearbox according to claim 2, characterized in that: Multiple carbon brushes are grouped together, and there are multiple groups of carbon brushes. These multiple groups of carbon brushes are evenly distributed in a ring around the spline shaft of the sun gear.

4. The remote detection device for the shaft voltage of a wind turbine speed-increasing gearbox according to claim 3, characterized in that: A brush holder is provided between the carbon brush and the housing. The brush holder is fixed to the housing and has a U-shaped hole. The copper handle of the carbon brush extends into the U-shaped hole for fixation.

5. The remote detection device for the shaft voltage of a wind turbine speed-increasing gearbox according to claim 4, characterized in that: The copper shank of the carbon brush has a wiring hole at its end, and the wire end has a terminal block. The wiring hole is used to accommodate the terminal block.

6. The remote detection device for the shaft voltage of a wind turbine speed-increasing gearbox according to claim 5, characterized in that: The cross-sectional area of ​​the wire between the carbon brush and the oscilloscope is not less than 2.5 mm². 2 .

7. The remote detection device for the shaft voltage of a wind turbine speed-increasing gearbox according to claim 6, characterized in that: The oscilloscope model is 6500H.

8. The remote detection device for the shaft voltage of a wind turbine speed-increasing gearbox according to claim 1, characterized in that: It also includes a controlled unit and an operating unit. The controlled unit is connected to the oscilloscope for communication, and the operating unit remotely controls the controlled unit and the oscilloscope through the controlled unit.

Images