Guidance background:In 2014, in response to the demand for blade monitoring from domestic customers, we developed a lightning protection sensor for blade monitoring. Through online monitoring and system analysis of wind turbine blades, we can detect problems such as blade vibration exceeding limits, excessive loads, blade cracking, and icing as early as possible. By real-time monitoring and exceeding limit alarms, we can adjust the operating status of the wind turbine in a timely manner to prevent blade accidents, which is of great practical significance for wind turbine safety. At the same time, the accumulated raw data has high reference value for the subsequent design, manufacturing, and optimization of wind turbines, and plays a positive role in the sustainable development of the wind power industry. The online monitoring system for wind turbine blades can monitor the operation and health status of the blades in real time. If abnormal vibration is detected, the system can automatically issue an alarm message to detect the location and development trend of the fault in advance, ensuring the safety of the wind turbine. However, with the continuous improvement of the power generation and efficiency of wind power equipment, the power generation of wind turbines has increased from 0.6MW in the past to 25MW now (such as Goldwind Technology's wind turbine, model: GWH300-20 (25) MW, with a single unit capacity covering 20-25 MW and an impeller diameter of 300 meters, specially designed for deep and distant seas, capable of withstanding typhoons of 60 meters per second. The data is sourced from the website. If there are any errors, please notify and correct them at any time). Recently, it has been found that the sensor has been damaged by direct lightning strikes during use. Therefore, in order to help customers better use this blade sensor, this guide is compiled to jointly promote the application and development of the industry!

322ATThe dual axis acceleration belt temperature output sensor is widely used for monitoring wind turbine blades. In practical applications, due to the high distance between the blades and the ground, the probability of being struck by lightning is relatively high. At the same time, the entire blade is made of non-metallic material, which has poor conductivity and shielding ability. The sensors and cables installed in the blade are more likely to be damaged by lightning strikes.

In order to prevent sensors and cables from being damaged by lightning strikes, it is necessary to install flashers or lightning rods on the blades in a standardized manner:

• The lightning rod or lightning arrester needs to be extended to the front of the sensor, near the blade tip position.

• Sensors and cables need to be kept at a distance of at least 20cm from the lightning arrester/lightning rod, and ensure sufficient insulation between the two.

• The grounding resistance of the lightning arrester/lightning rod needs to be

• If it is not possible to ensure the grounding resistance of the lightning arrester/lightning rod, a common mode filter can be added in front of the data acquisition equipment to increase the sensor cable to

  The resistance between the ground drives the lightning current to be released along the lightning arrester/lightning rod to the ground.

Common mode filters can be made in the following two ways:

1. Using common mode inductors to make filters. The filter circuit is shown in the following figure. When designing PCB, it is necessary to ensure that the withstand voltage between the input/output of the filter inductor is greater than 5kV. The filter should be installed in an insulated housing to avoid breakdown and conduction of surrounding equipment. The filter should be located close to the data acquisition device.

2. Using manganese zinc ferrite magnetic ring winding to make common mode filters. Choose a manganese zinc ferrite magnetic ring with a size of 63 * 38 * 25mm or larger, thread the cable through the magnetic ring for at least 10 turns, and then connect it to the data collector. During the threading process, do not damage the insulation layer. As shown in the figure below, the magnetic ring should be close to the data acquisition device.

Finally, a special reminder and attention should be paid to the above suggested solutions. Sensor manufacturers aim to help users make good use of relevant monitoring solutionsThe suggestion is to make every effort to protect from perception and collection; But for high-energy lightning strikes, it is difficult to provide protection from circuits and data collection. More importantly, it is necessary to do a good job in lightning protection and lightning protection for wind power generation equipment.For further information on product installation and application, please contact us: