The Application of Initiative Lightning Protection Technology Based on Lightning Nowcasting and Warning

Based on traditional passive lightning protection technology, an initiative of lightning protection technology is proposed on the basis of lightning nowcasting and warning system, considering features of electron system thunderbolt disaster. An application system is developed based on B/S framework. The system can automatically block lightning surge channel of protection when lightning is coming, and return to normal when the alarm is clear. Through the visualization of GIS, the process of lightning, the evolution of effective warning and the implementation of control terminal are shown dynamically. A survey is carried out on terrain conditions of four radio stations at Quanzhou, and the historical lightning environment and the main route of lighting wave invasion are analyzed in detail. The initiative lightning protection technology is used in the serious area of thunderbolt disaster by the way of key locations. Combining the electromagnetic field of the lightning current radiation and the anti-jam effect of electronic apparatus, the key location is determined within a 5-kilometer radius. In order to evaluate the effect, the response time of sub-closing and the advanced direction and time detecting (ADTD) of monitoring data of each terminal is analyzed. The efficiency of initiative lightning protection is tested by two methods in these four radio stations from August 2013 to August 2014. One method is to calculate the efficiency of thunderbolt disaster depending by counting the total number of lightning in range of key locations, the number of lightning when the warning level is at dangerous or too dangerous level. The forecast scoring method is also used to estimate the efficiency, giving the POD (probability of detection), FAR (false alarm rate) and TS (threat score).The result demonstrates that the initiative lightning protection technology is a better improvement and supplement for the passive lightning protection technology. In contrast with the quantity of lightning flashes, warning results of 4 radio stations is 69%, and with the forecast scoring method the probability of detection is 53%. The system gives better warning result in the area where lightning activities are centralized than that in the area where lightning activities is scattered.