Interception efficiency is the most important parameter to show the effectiveness of air-termination systems. The dynamic electro-geometrical model (DEGM), a numerical method, is capable of calculating such interception efficiencies. This model is purely based on international accepted models, parameters, deviations and dependencies, which are also comprised in the IEC 62305 series.
It is possible to optimize the positioning of the rods in order to obtain interception efficiency as high as the one calculated for the selected level of protection (90%). The rods with the lowest efficiency can be neglected and it is even possible to position the rods in an optimized way using the DEGM.
This approach is particularly interesting for complex shaped sites.