Compared with prepreg taped material, the restrained damage area due to special designed stacking sequence, lamina thickness and the weft nylon binder make the woven fabric reinforcement a good choice for the fabrication of lightning protection structures.
Last month lightning hit the structure, causing several stone chunks to crumble to the ground.
The great part of such overvoltages are originated by direct and nearby lightning flashes to structures and to lines, it is then important to evaluate the reliability of the protective device.
(It is important to stress that the evaluation of NALDN in the vicinity of the tower is mainly based on tall-structure lightning, which is upward-initialed, due to the rarity of recording downward-initiated lightning at the extremely tall tower).
Aim of the paper is to give the rationale for evaluating the coordinated surge protective device (SPD) system characteristics in order to reduce the probability of damage of electrical and electronic equipment within a structure against lightning surges due to direct lightning stroke to the connected low voltage overhead lines (source of damage S3 according to IEC standard 62305).
On May 11th Mary Schapiro, the chairman of the Securities and Exchange Commission SECC), remained non-committal about the cause when she testified before Congress.In the meantime Ms Schapiro is turning her attention to the fragmented structure and lightning speed of stockmarkets.
The conclusion: no lightning will strike the structure to be protected if its striking distance is greater than the radius of the sphere.
The paper proposes practical procedures for the selection of SPD systems able to protect, with a given probability, electronic and electrical equipment within a structure against lightning surges.
These results suggest that the fiberglass layer is not expected to protect the integrity of the carbon fiber reinforced polymer structure from lightning strike damage.
Examples of application of such procedures to different types of SPD systems are shown in the worst cases of direct lightning stroke to the structure or to the connected low voltage overhead line; also the cases of lightning stroke to ground nearby the structure or the connected line are considered.
The present paper aims to illustrate the influence of the main factors which affect the selection and installation of an SPD for the protection of electrical and electronic systems against overcurrent and overvoltage due to direct lightning flash to a structure.
