Based on deepening of cognition to the cavern wall_rock and its structure attribute, the main transformers and step_up substation are laid out in underground cavern in inviting design stage instead of that on the ground_surface.

• 基于对洞室围岩认识的深化以及围岩所具有的结构属性 ,介绍招标设计阶段将主变及升压站由初设阶段的地面布置方案优化为地下布置方案后的地下厂房洞室布置情况及其主要特点。