A device and method for real-time detection of fan blade downconductor breakage

Abstract

The invention discloses a real-time detection device and method for the breakage of the down-conductor of the fan blade, comprising a sensor installed between the down-conductor inside the blade and the flange of the blade, and the sensor includes a first sensor electrically connected to the down-conductor A terminal and a second terminal electrically connected to the blade flange, a spark gap is formed between the first terminal and the second terminal; both the first terminal and the second terminal are electrically connected to a spark gap charge measurement circuit; the sensor is wired or wirelessly connected There are signal analysis and logic units. The invention can judge the operation state of the down conductor of the blade in real time, quickly locate the faulty fan, monitor in real time, ensure the operation reliability of the fan and greatly shorten the fault detection time of the fan.

Description

technical field [0001] The invention relates to the technical field of fan lightning protection, in particular to a real-time detection device for the breakage of the downconductor of the fan blade. Background technique [0002] The fan unit is struck by lightning during normal operation. If there is no down conductor installed inside, it will cause mechanical failure or partial electrical failure of the fan blades. In severe cases, accidents such as blade bursting will affect the operation of the entire fan unit. The installation cost is high, the expensive parts are not easy to repair, and once a failure occurs, it will easily cause huge property losses. Therefore, it is essential to install down conductors on the fan blades. However, the down conductors are prone to strand breakage after a long period of work. Or fracture problem, if can not be discovered in time, then will endanger the safe and stable operation of blade or even the whole fan, and how to detect the operat...

AI Technical Summary

Problems solved by technology

According to survey data, 60% of natural accidents in wind farms are lightning strike accidents, and blade damage accounts for 7% to 10% of all lightning strike accidents. The point generates huge heat energy, which causes the temperature of the down conductor to rise rapidly, causing the blade to deform or crack

When the down conductor breaks, an arc is easily generated when the lightning current flows through the conductive channel, and the high temperature generated by the arc will also cause huge damage to the blade, which is also one of the main reasons for the damage of the fan blade. Deformation or cracking will have a huge impact on the safe operation of the fan, resulting in huge property losses, and will also cause the fan to be out of operation, reducing the utilization rate of the fan

[0004] In the existing research, there are very few detection methods for the state of the down-conductor of the fan blade. Germany Senweian Co., Ltd. has studied a blade lightning protection device, which strips the cable section of the down-conductor cable, and the stripped wire Connectors are installed in the cable section and electrically coupled with lightning receivers, but this method can only detect lightning strikes, and cannot judge the operating status of the down conductor; Inner Mongolia University of Science and Technology proposed a test for the disconnection of the down conductor of the wind turbine blade The system and method are used to detect the broken wire position of the down conductor. By loading a pulse signal generating device on the down conductor at the root of the blade and putting a sensor on it, the sensor establishes a signal transmission connection with the computer through a signal conditioning circuit. The computer-controlled pulse signal generator sends a pulse signal and loads it onto the down conductor, and uses an algorithm to determine whether the down conductor is disconnected and where it is broken. It is very inconvenient to measure at the hub; most wind farms now use manual inspection to detect the operation status of the blade down-conductor. This method is not only inefficient but also highly subjective, which can easily lead to misjudgment

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