Presented by: Hari Prasad Rimal (Engineering Department, University of Perugia, Italy)
Advancement in technologies has established at least two new trends in the operation and design of aircraft structure. There is increase in the use of miniaturized, solid state components in the avionic equipments, the practice that loses robustness over functionality. Similarly, the body structure of the modern aircrafts are increasingly constructed from the carbon fibre and its composites, the practice that reduces the electromagnetic shielding, as a result the electromagnetic cleanliness inside the aircraft is compromised during the transient events such as the lightning phenomenon. In the light of these facts, the lightning indirect effect protection of the avionic equipments is still a challenging job. We present an inductive filter in combination with a Metal Oxide Varistor (MOV) for a robust and reliable protection of the avionic equipments against the lightning indirect effects. Ferromagnetic core or ferrite inductor and a MOV combination has been proposed to analyse their performance in protecting the Equipments under Test (EUT) for the indirect lightning waveforms reported in the International standard for Airborne equipments RTCA/DO-160G. The results from the test of this protection system on actual avionic equipment such as DC-DC converter are also presented.