Fan blade lightning conductor fault detection device

Abstract

The utility model discloses a fan blade lightning conductor fault detection device, which comprises a shell and a circuit board arranged in the shell, a battery unit, a power management unit connected with the battery unit, a processor, a human-computer interface arranged on the shell, a display controller connected with the human-computer interface, a memory, a signal acquisition board card for measuring pulse signals and reflected waves thereof, and a pulse power supply for emitting pulse current are integrated on the circuit board; the high-performance processor is respectively connected with the power management unit, the display controller, the memory, the signal acquisition board card and the pulse power supply, the shell is provided with a first wiring port used for being connected with a lightning conductor of a fan blade through an output lead and a second wiring port used for being connected with a ground wire through a ground lead, and the first wiring port is connected with the pulse power supply. And the second wiring port is connected with the signal acquisition board card. The device is convenient to operate, is accurate and reliable, effectively determines whether the lightning conductor of the fan blade is normal, and conveniently eliminates faults such as strand breakage and line segment of the lightning conductor.

Description

Technical Field

[0001] This utility model relates to a fault detection device for the lightning protection wire of a wind turbine blade. Background Technology

[0002] Wind turbines are typically built in mountainous areas or near coastlines at relatively high altitudes, making them more susceptible to lightning strikes. The turbine blades are the most vulnerable component to lightning strikes; because the blades are made of fiber materials, high-energy lightning currents can only be conducted to the ground through lightning protection wires.

[0003] Currently, the metal conductor of the lightning protection wire is mainly installed on or inside the blade surface to guide the lightning current to the blade root and then to the ground through the equipotential bonding system between the tower and the hub. However, when the leakage path fails, an arcing phenomenon will occur at the broken wire, generating high temperature instantly, which will cause the blade to crack or even explode, resulting in huge economic losses to the wind farm.

[0004] To avoid losses, it is necessary to detect faults in the lightning protection wires of wind turbine blades. Detecting faults in the lightning protection wires of wind turbine blades is a challenging problem in the operation and management of wind turbines. Domestic and international experts have conducted extensive research and applications in this area, but issues such as cumbersome on-site applications and low detection efficiency remain.

[0005] Currently, the main testing method for lightning protection wires both domestically and internationally is the Ohm's Law test. The principle is to apply voltage across the two ends of the lightning protection wire. When the lightning protection wire is intact and without breaks, its resistance is extremely low under the applied voltage. However, lightning protection wires with defects such as broken strands or complete fractures exhibit a relatively high resistance under the applied voltage. Therefore, when testing lightning protection wires, the measured wire must form a complete closed loop. For lightning protection wires and down conductors under wind turbine towers, the closed loop resistance can be measured using external testing instruments, yielding relatively accurate results. However, for lightning protection wires on wind turbine blades, the entire testing process requires connecting the lightning arrester at the blade tip, which is inconvenient. Utility Model Content

[0006] The purpose of this invention is to provide a wind turbine blade lightning protection wire fault detection device that is simple in structure, low in cost, accurate and reliable, and easy to operate.

[0007] The purpose of this utility model is achieved through the following technical measures: A fault detection device for the lightning protection wire of a wind turbine blade, characterized in that it includes a shell and a circuit board built into the shell. The circuit board integrates a battery unit, a power management unit connected to the battery unit, a processor, a human-machine interface on the shell, a display controller connected to the human-machine interface, a memory, a signal acquisition board for measuring pulse signals and their reflected waves, and a pulse power supply for emitting pulse current. The processor is connected to the power management unit, the display controller, the memory, the signal acquisition board, and the pulse power supply respectively. The shell is provided with a first terminal for connecting the lightning protection wire of the wind turbine blade through an output wire and a second terminal for connecting the ground wire through a grounding wire. The first terminal is connected to the pulse power supply, and the second terminal is connected to the signal acquisition board.

[0008] This invention employs the pulse current method for positioning. The principle is simple and feasible, the operation is convenient, and the accuracy and reliability are high. It can effectively determine whether the lightning protection wire of the wind turbine blades is normal, conveniently eliminate faults such as broken strands or broken wires in the lightning protection wires, and provide accurate diagnoses based on measurement information. It offers proactive, early warning-based maintenance for wind turbine status on-site, guiding on-site personnel to take timely preventative measures to eliminate potential hazards, improving the reliability of the company's wind turbine operation, reducing maintenance costs and significant economic losses caused by faults, and generating substantial economic benefits.

[0009] The processor described in this invention is a high-performance processor. A high-performance processor refers to a central processing unit (CPU) or other type of processor that excels in processing power and performance. These processors typically employ advanced process technology, efficient architectural design, and optimized instruction sets, enabling them to provide powerful computing performance with limited resources.

[0010] The power management unit described in this invention employs a high-efficiency DC / DC power supply and power conversion circuit.

[0011] The signal acquisition board described in this utility model is an ultra-high-speed signal acquisition board, which adopts a 3PA1030 chip sampling circuit with a sampling rate of 50MHz.

[0012] The pulse power supply described in this invention is an all-solid-state programmable pulse power supply. This all-solid-state programmable pulse power supply consists of a working power supply, a high-speed D / A converter, an anti-glitch filter, and a high-power follower connected in sequence. The high-speed D / A converter is connected to the high-performance processor, and the high-power follower is used to connect to the lightning protection wire of the wind turbine blades via an output wire. Solid-state devices have the advantages of small size, high efficiency, long service life, high repetition frequency, low cost, stable operation, and simple maintenance.

[0013] The high-speed D / A converter described in this invention uses a high-performance 3PD5651E, which has a 10-bit digital-to-analog conversion bit and a maximum conversion speed of 125 MSPS.

[0014] The battery unit described in this invention is connected to an external DC power source for charging it.

[0015] The average power consumption of the wind turbine blade lightning protection wire fault detection device described in this utility model is 10W.

[0016] Compared with the prior art, the present invention has the following significant advantages:

[0017] (1) This utility model uses the pulse current method for positioning. The principle is simple and feasible, the operation is convenient, accurate and reliable. It can effectively determine whether the lightning protection wire of the wind turbine blade is normal, conveniently eliminate faults such as broken strands and broken wires of the lightning protection wire of the wind turbine blade, and provide accurate diagnosis based on measurement information. It provides early warning and proactive maintenance of wind turbine status on site, guides on-site personnel to take preventive measures in a timely manner to eliminate hidden dangers, improves the reliability of the company's wind turbine operation, reduces maintenance costs and the significant economic losses caused by faults, and can generate significant economic benefits.

[0018] (2) The all-solid-state programmable pulse power supply of this utility model has the characteristics of small size, high efficiency, long service life, high repetition frequency, low cost, stable operation and simple maintenance.

[0019] (3) This utility model has a simple structure, low cost, strong practicality, and is suitable for widespread promotion and use. Attached Figure Description

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0021] Figure 1 This is a schematic diagram of the composition structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the composition structure of the all-solid-state programmable pulse power supply of this utility model;

[0023] Figure 3 This is a schematic diagram of the detection principle of this utility model;

[0024] Figure 4 This is a schematic diagram of the present invention in use;

[0025] Figure 5 This is the waveform displayed on the human-machine interface during the testing process of this utility model.

[0026] In the diagram: 1-Fault detection device for lightning protection wire of wind turbine blade, 2-Output wire, 3-Grounding wire, 4-Wind turbine tower, 5-Wind turbine blade, 6-Slip ring. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] like Figure 1 As shown, this utility model discloses a wind turbine blade lightning protection wire fault detection device 1, which includes a housing and a circuit board built into the housing. The circuit board integrates a battery unit (lithium-ion battery) connected to an external DC power supply, a power management unit connected to the battery unit, a high-performance processor, a human-machine interface on the housing, a display controller connected to the human-machine interface, a memory (including hard disk and memory accessories), a signal acquisition board (ultra-high-speed signal acquisition board) for measuring pulse signals and their reflected waves, and an all-solid-state programmable pulse power supply for emitting pulse current. The high-performance processor is connected to the power management unit, the display controller, the memory, the signal acquisition board, and the all-solid-state programmable pulse power supply. The battery unit has a first terminal on the housing for connecting to the wind turbine blade lightning protection wire through an output wire 2 and a second terminal for connecting to the ground wire through a grounding wire 3. The first terminal is connected to the all-solid-state programmable pulse power supply, and the second terminal is connected to the signal acquisition board.

[0029] in,

[0030] The lithium battery can power 20 tests per day, 4 hours of operation, and last for about 5 days of continuous use.

[0031] The power management unit uses a high-efficiency DC / DC power supply and power conversion circuit, resulting in an average power consumption of approximately 10W for this detection device.

[0032] To achieve accurate measurement of pulse signals and their reflected waves, the signal acquisition board is an ultra-high-speed signal acquisition board. It uses a 3PA1030 chip sampling circuit with a sampling rate of 50MHz, and integrates an on-chip sample-and-hold amplifier and a reference voltage source, featuring high performance and low power consumption.

[0033] like Figure 2As shown, the pulse power supply adopts an all-solid-state programmable pulse power supply, which consists of a working power supply, a high-speed D / A converter, an anti-glitch filter, and a high-power follower connected in sequence. The high-speed D / A converter is connected to a high-performance processor, and the high-power follower is used to connect to the lightning protection wire of the wind turbine blades through the output wire. The high-speed D / A converter uses the high-performance domestically produced 3PD5651E device, which has a 10-bit digital-to-analog (D / A) conversion bit, a maximum conversion speed of 125 MSPS, and flexible adjustable parameters (pulse amplitude, pulse width, repetition frequency, and number of pulses), making it suitable for different scenarios and fully meeting the detection requirements.

[0034] like Figure 3 As shown, the detection principle of this utility model is: the pulse current method is used for positioning. The basic principle is the wave process in high voltage theory. During the transmission process, the pulse signal propagates along the lightning protection line in the form of electromagnetic waves at a speed close to the speed of light. When it encounters a point where the wave impedance is discontinuous (i.e., the fault point), a reflection phenomenon will occur.

[0035] like Figure 4 As shown, when using this utility model for testing, the output wire 2 connected to the first terminal is connected to the lightning protection wire installed on the wind turbine blade 5 (the wind turbine blade 5 is installed on the slip ring 6), and the ground wire is connected to the grounding wire 3 connected to the second terminal (through the equipotential bonding system of the wind turbine tower 4).

[0036] The working process of this utility model is as follows: After the power switch is turned on, the lithium-ion battery supplies power to the power management unit (when this device is connected to an external DC power supply, the external power supply charges the lithium-ion battery and supplies power to the power management unit at the same time); the power management unit converts the 10.2V~12.6V voltage of the lithium battery into a constant 5V DC power supply for use by other modules and units; after the high-performance processor is powered on, it sends a command to the display controller, the human-machine interface displays the required interface, and waits for command input. Then, after the user selects the corresponding function through the human-machine interface, the high-performance processor responds. For example, if the user selects "fan", the high-performance processor will respond. The "Lightning Protection Wire Disconnection Fault Detection" function involves the high-performance processor sending a specific waveform data sequence signal to the all-solid-state programmable pulse power supply. Simultaneously, the ultra-high-speed acquisition board is activated to measure and sample the signal of the wind turbine's lightning protection wire. After the sampled data is parsed by the high-performance processor, it is stored in the hard drive and memory. Upon receiving the signal, the all-solid-state programmable pulse power supply generates the required pulse signal and transmits it to the wind turbine's lightning protection wire through the output wire. After the signal output is complete, the high-performance processor analyzes the waveform data stored in the hard drive and memory to obtain the detection result, which is then displayed through the human-machine interface, awaiting user input.

[0037] This invention was tested as follows: A 100-meter cable was cut at 70 meters, and the invention was then tested. If... Figure 5 As shown, the reflected wave can be observed on this utility model, and the fault point can be correctly located at 70 meters, indicating that this utility model can accurately and reliably determine the fault point of the cable.

[0038] It should be understood that this embodiment is for illustrative purposes only and is not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A wind turbine blade lightning conductor fault detection apparatus characterised in that: The fan blade lightning arrester fault detection device comprises a shell and a circuit board built in the shell, a battery unit, a power management unit connected with the battery unit, a processor, a man-machine interface arranged on the shell, a display controller connected with the man-machine interface, a memory, a signal acquisition board card for measuring pulse signals and reflected waves thereof, and a pulse power supply for emitting pulse current are integrated on the circuit board, the processor is connected with the power management unit, the display controller, the memory, the signal acquisition board card and the pulse power supply respectively, first wiring ports for connecting fan blade lightning arrester lines through output wires and second wiring ports for connecting ground wires through grounding wires are arranged on the shell, the first wiring ports are connected with the pulse power supply, and the second wiring ports are connected with the signal acquisition board card.

2. The fan blade lightning wire fault detection apparatus of claim 1, wherein: The processor is a high-performance processor.

3. The fan blade lightning wire fault detection apparatus of claim 2, wherein: The power management unit is a high-efficiency DC / DC power supply and a power conversion circuit.

4. The fan blade lightning wire fault detection apparatus of claim 3, wherein: The signal acquisition board card is a super-high-speed signal acquisition board card, which adopts a 3PA1030 chip sampling circuit and has a sampling rate of 50 MHz.

5. The fan blade lightning wire fault detection apparatus of claim 4, wherein: The battery unit is connected with an external DC power supply for charging.

6. The fan blade lightning wire fault detection apparatus of claim 5, wherein: The average power consumption of the fan blade lightning arrester fault detection device is 10 W.

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