Explosion Resistance Performance Analysis and Structural Optimization of Explosion-Proof Box for Cable Joints

Explosion resistance is the most critical performance parameter of an explosion-proof box. Ensuring reliable protection for cable joints in the structural design is crucial in reducing the range of faults. This paper aimed to explore the explosion resistance performance of the explosion-proof box and determine its optimal structural parameters. To achieve this, the breakdown arc energy of cable joints was equated to TNT explosion energy. The dynamic response of the explosion-proof box under the explosive impact of 20kV three-core cable joints was analyzed using the explicit dynamics finite element method. Additionally, an orthogonal experiment was conducted to investigate the influence of structural parameters on its explosion resistance performance. The findings indicated that increasing the shell thickness and cavity diameter effectively enhance explosion resistance, while the shell length and end diameter had minimal impact. Therefore, a shell length of 2200mm, end diameter of 140mm, shell thickness of 8mm, and cavity diameter of 120mm were considered appropriate. These research results provide valuable technical insights for designing explosion-proof boxes and safeguarding cable joints, ultimately contributing to the safe and stable operation of cables.