Sneak circuit analysis for electrical system with different grounding schemes

The sneak circuits in two grounding designs for launch vehicle electrical systems： a grounding shell and a floating ground-grounding shell are analyzed， and the sneak circuits are presented in both designs. Based on electromagnetic field theory， a sneak circuit model is established for the launch vehicle electrical system grounding system under transient high voltage and electromagnetic radiation conditions. The impact of transient high voltage and electromagnetic radiation on the operation and failure phenomena of the launch vehicle electrical system is analyzed theoretically. Based on the sneak circuit model， grounding design principles are proposed for both grounding schemes， which suppress sneak circuits in the electrical system. The analytical approach and methods presented in this paper can serve as a reference for other designers and the reliability and robustness of launch vehicle electrical systems can further be improved.