Abstract:

The mechanical fatigue issue of door-crossing secondary cables during the opening and closing of instrument compartment doors is addressed by proposing an optimized wiring scheme based on an arc-shaped buffer transition.By increasing the reserved length of door-crossing cables and implementing pre-bending treatment, a arc-shaped flexible structure is constructed, achieving a 20% reduction in tensile strain and a 34% decrease in stress concentration values during cable movement.Cable harness flexibility is effectively enhanced and insulation layer lifespan is extended.Simulation experiments and prototype verification results demonstrate that the proposed solution significantly improves the uniformity of strain distribution in cable harnesses, providing both theoretical foundations and practical guidance for ensuring the reliable operation of intelligent switchgear.

Key words: switchgear instrument compartment, secondary cable, arc-shaped buffer transition, mechanical fatigue, wiring optimization