Research on the blast effects of explosion-proof casings for high-voltage cables

The cable joint is the primary component where faults occur in high-voltage cable lines. Installing explosion-proof casings can effectively mitigate secondary damage caused by incidents such as arc-induced blasts. To address the design rationality of a specific type of explosion-proof casing, this study employs the finite element analysis (FEA) to numerically simulate its dynamic response under explosive loading. The analysis focuses on the dynamic response and stress distribution of the casing when a quantified TNT is detonated inside it, as well as the influence of casing thickness on stress levels. Finally, the results indicate that the annular region around the blast center experiences the highest stress and deformation during detonation. Casing thickness is a critical factor significantly affecting stress magnitude. Furthermore, relocating pressure relief vents to the annular region around the blast center could potentially optimize future designs. Findings of this study provide valuable insights for the structural optimization of such explosion-proof casings.