Lightning early warning system technical indicators and early warning classification
A. Technical indicators
1. The advance time of lightning warning is not less than 10 minutes.
2. The average effective alarm rate of lightning is not less than 80%.
3. The detection radius is not less than 10 kilometers.
4. The detection accuracy of atmospheric electric field is better than ±5%.
5. With three-level lightning warning function.
6. The storage time of historical lightning warning data is not less than 3 years.
7. The lightning detection module installed on site should meet the electrical explosion-proof requirements of large oil and gas storage bases. The protection level is not lower than IP65.

8. The life of the lightning detection module is not less than 3 years.

B. Early warning classification
Lightning warning information is divided into three levels:
1. First-class early warning: there may be lightning activities, the atmospheric electric field in the coverage area is increasing, the electric field is fluctuating, and the location of the ground flashback strike is located in a nearby area 10 kilometers away from the large oil and gas storage base, which may cause lightning accidents.
2. Secondary early warning: the possibility of lightning occurrence is high, the atmospheric electric field in the coverage area increases rapidly, the fluctuation of the electric field intensifies, and the location of the ground flashback strike point is 5-10 kilometers away from the large oil and gas storage base, which may increase the possibility of lightning strike accidents .

3. Three-level early warning: lightning is about to occur, the atmospheric electric field in the coverage area fluctuates violently, and the location of the ground flashback strike point is 0-5 kilometers away from the large oil and gas storage base, which is likely to cause a lightning strike accident.

C. Operation and maintenance
1. Before the rainy season every year, the hardware equipment, network interface, software platform and surrounding environment should be checked in time to ensure that the lightning early warning system is in normal operation, including sensors (probes), host, temperature and humidity conditions in the chassis, solar module panels , battery, etc.
2. When the data of the lightning detection module cannot be received normally, the operating status and communication of the equipment should be checked immediately.