500kV 1200MVA Oil-Immersed Power Transformer

Product Advantages

• Gigantic Capacity for EHV Transmission:
◦ Features a massive 1200 MVA rated capacity and a 500 kV EHV design.
◦ Tailor-made for inter-regional backbone grids and massive clean energy bases (such as gigawatt-scale nuclear and hydroelectric plants), effectively resolving bottlenecks in high-capacity, long-distance power transmission.
• High-Efficiency Auto-Transformer Design:
◦ Utilizes an autotransformer three-winding configuration, significantly optimizing energy conversion efficiency between the 500 kV and medium-voltage grid levels.
◦ Compared to conventional transformers of the same capacity, it drastically reduces the consumption of copper wire and silicon steel sheets, effectively lowering both total manufacturing costs and transportation weight.
• Ultra-Low Losses & Optimized Thermal Management:
◦ The core employs world-class high-permeability, low-loss cold-rolled grain-oriented silicon steel combined with advanced multi-stage step-lap joint technology to minimize no-load losses.
◦ Features a fully directed oil-forced air-cooled (ODAF) system, ensuring uniform temperature rise within windings and the core—and preventing localized overheating—during 100% full-load operation or sudden overloads.
• Superior Short-Circuit Withstand Capability:
◦ Engineered to withstand the immense mechanical and electromagnetic forces inherent to the 1200 MVA class; the structure incorporates high-strength internal supports, robust fasteners, and advanced mechanical clamping processes to ensure equipment integrity during sudden grid faults.
• Smart OLTC & Online Monitoring:
◦ Equipped with a high-end vacuum On-Load Tap Changer (OLTC) for smooth, stepless voltage regulation without interrupting the power supply.
◦ Supports integration with intelligent online monitoring systems for partial discharge (PD) and dissolved gas analysis (DGA), enabling full-lifecycle condition-based alerts and maintenance-free operation.