Research on the lightning risk assessment method for Chongqing based on fuzzy mathematics

Reasonable and scientific lightning disaster risk assessment can effectively reduce losses caused by lightning, but at present the lightning risk assessment system is not perfect, sometimes it cannot well evaluate actual lightning disaster risks. For some certain occasions, IEC62305-2 standard dose not well reflect the true lightning risk, such as large-scale residential district, a large area factory, etc. In these cases, On the basis of in-depth study on the mechanism of lightning disaster, we can analyze the lightning risk by three aspects of hazard, exposure and vulnerability of hazard bearing body. Then we select eleven lightning risk factors such as ground flash density, lightning current intensity, lightning current steepness, the number of personnel, the equivalent property, relative height, floor space, nature of use, effective spacing, etc. At last by AHP and fuzzy mathematics theory, we obtain the lightning risk assessment formula for Chongqing region. Through the lightning risk assessment method Specific assessment verification shows that this method has better applicability and can better serve lightning protection and disaster reduction in Chongqing region, it can be a good supplement for IEC62305-2 lightning risk assessment.