110kV SF22 Series Oil-immersed Transformers: Technical Overview The 110kV SF22 series oil-immersed transformer is a high-voltage power transformer designed for efficient energy transmission and distribution in electrical grids. These transformers are widely used in substations, industrial plants, and utility networks due to their reliability, durability, and high performance under demanding operating conditions. Design and Construction The SF22 series features a robust oil-immersed design, where mineral oil serves as both an insulating and cooling medium. The core is constructed from high-grade grain-oriented silicon steel, ensuring low no-load losses and reduced hysteresis effects. The windings are made of electrolytic copper or aluminum, depending on the application requirements, and are carefully insulated to withstand high voltages and thermal stresses. The tank is fabricated from carbon steel with anti-corrosion treatment, ensuring long-term durability in harsh environments. Radiators or cooling fins are integrated to enhance heat dissipation, maintaining optimal operating temperatures. Some models may include on-load tap changers (OLTC) or off-circuit tap changers (OCTC) to regulate voltage levels without interrupting power supply. Key Technical Features - Rated Voltage: 110kV (primary) with secondary voltages tailored to grid requirements. - Capacity Range: Typically from 10 MVA to 63 MVA, supporting various load demands. - Efficiency: Complies with international standards (e.g., IEC, IEEE) for energy efficiency, with low no-load loss (P₀) and load loss (Pₖ). - Cooling Method: ONAN (Oil Natural Air Natural) or ONAF (Oil Natural Air Forced) cooling systems for effective thermal management. - Insulation System: High-quality oil-paper insulation ensures dielectric strength and long service life. - Protection Features: Includes Buchholz relays, pressure relief devices, and temperature monitors for safe operation. Applications These transformers are ideal for: - Power transmission networks (110kV substations). - Renewable energy integration (wind/solar farms). - Industrial power supply (steel plants, mining operations). - Urban and rural grid upgrades. Advantages - High reliability with minimal maintenance requirements. - Low environmental impact due to efficient oil containment and recyclable materials. - Flexible configurations (e.g., modular accessories, bushings, and monitoring systems). Compliance and Testing The SF22 series undergoes rigorous testing, including: - Dielectric tests (lightning impulse, power frequency withstand). - Temperature rise tests to verify thermal performance. - Short-circuit withstand tests ensuring mechanical stability. Conclusion The 110kV SF22 oil-immersed transformer is a critical component in modern power systems, offering a balance of efficiency, durability, and adaptability. Its advanced design ensures stable operation in diverse environments, making it a preferred choice for utilities and industries worldwide. (Word count: 500)