Description

The GSU (Generator Step-Up) Transformer plays a critical role in nuclear power plants as a core electrical device connecting nuclear generators to the transmission grid. Within the plant, nuclear reactors produce massive thermal energy, which is converted into high-temperature, high-pressure steam via steam generators to drive turbine generators and generate electricity. At this stage, the generator outputs medium-low voltage alternating current (typically 10–20kV). The primary function of the GSU transformer is to significantly boost this voltage to levels such as 110kV, 220kV, or higher, meeting the demands of long-distance, large-capacity power transmission, reducing energy loss during transmission, and enabling efficient integration of nuclear power into the grid. Its operational status directly impacts the stability and reliability of nuclear power output, as well as the safe and stable operation of the entire power system, making it a key hub for ensuring continuous and stable power supply from nuclear plants.

• 1-Ph 484MVA/500kV

Features

• Ultra-High Reliability and Stability: Nuclear power plants have extremely stringent operational requirements. GSU transformers use top-quality high-permeability silicon steel sheets for cores and high-purity oxygen-free copper for windings, combined with advanced manufacturing processes and insulation technologies. This ensures reliable and stable operation under long-term high loads and continuous service, minimizing failure risks and reducing disruptions to nuclear power generation. They are also equipped with redundant protection and monitoring systems, such as multiple relay protection devices that real-time monitor current, voltage, and temperature. These systems act quickly to cut off circuits in case of abnormalities, preventing fault escalation. Additionally, smart sensors continuously track equipment performance, providing data support for preventive maintenance to keep the device in optimal condition.

• Strong Short-Circuit Resistance: The internal power grid of nuclear plants is complex, and short-circuit faults may occur under abnormal conditions, generating powerful short-circuit currents and electromagnetic forces. GSU transformers feature specially wound windings to enhance mechanical strength and stability between windings, enabling them to effectively withstand the impact of strong electromagnetic forces during short circuits. This maintains structural integrity, ensures transformer safety, and avoids severe consequences such as equipment damage or even nuclear plant shutdowns caused by short circuits.

• Adaptability to Harsh Environments: Nuclear power plants have complex internal environments with factors like radiation, high temperatures, high humidity, and chemical corrosion. GSU transformers are designed with enclosures featuring excellent shielding performance to effectively block radiation and protect internal electrical components. They use high-temperature-resistant, moisture-resistant, and corrosion-resistant insulation materials and protective coatings, ensuring stable insulation performance in high-temperature and high-humidity environments. This prevents issues like insulation aging or short circuits caused by environmental factors, guaranteeing long-term normal operation in harsh nuclear plant conditions.

• Large Capacity and High-Voltage Compatibility: As nuclear power plant generation capacity continues to increase, demands for GSU transformer capacity and voltage levels have risen. These transformers typically offer capacities of several hundred MVA or higher, with voltage levels that match grid connection requirements—stepping up from tens of kV to 110kV, 220kV, or higher. This enables efficient large-scale transmission of nuclear power, meeting society’s massive electricity needs.

• Low Loss and Energy Efficiency: Amid growing emphasis on energy utilization and environmental protection, GSU transformers for nuclear power plants focus on minimizing losses. Through optimized core structures and improved winding designs, they reduce core hysteresis losses and winding resistance losses, enhancing energy conversion efficiency. This lowers power generation costs, reduces unnecessary energy waste and carbon emissions, and aligns with green development concepts.