Performance Evaluation of Non-Conventional Lightning Protection Systems Based on NLDN Data

Charge Transfer Systems (CTS) are non-conventional lightning protection devices that, according to vendor specifications, prevent lightning from terminating within a defined area. The devices have been installed at facilities around the world in lieu of traditional Franklin rod lightning protection systems. Two prominent CTS installations in the United States are at the Browns Ferry Nuclear Plant and the Memphis FedEx World Hub. Historical NLDN data from 1995-2019 are analyzed for these two sites to illustrate whether the vendor claims of lightning prevention are, in fact, accurate. Ground-stroke densities are computed in areas where CTS are installed versus those without CTS to determine if there is a statistically significant difference that could be attributed to DAS installation.