On April 11, 2026, Zhongxin General completed delivery of one 16,000 kVA on-load tap-changing oil-immersed transformer to a dedicated 35kV industrial zone substation. This unit will serve as the main step-down transformer for the entire zone, taking dedicated 35kV incoming power and stepping it down to 10.5kV for zone-wide distribution. This case study documents the complete production process from core stacking through factory acceptance testing to dispatch