English
The SFZ-80000-121±2×2.5%/11 is an 80MVA high-performance transformer designed for 121kV/11kV voltage conversion, featuring on-load tap changing (OLTC) with ±2×2.5% regulation. Compliant with IEC 60076 and IEEE C57.12 standards, it incorporates:
✔Low-loss silicon steel core (no-load loss ≤45kW) for >99.4% efficiency
✔ONAN/ONAF cooling with 65°C average winding temperature rise
✔Short-circuit impedance 10.5% for grid stability
Ideal for substation upgrades and industrial power systems, it offers 40-year design life. Custom configurations available.
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SFZ-80000-121±2×2.5%/11
The SFZ Series 121kV on-load tap changing (OLTC) power transformer (model: SFZ-80000-121±2×2.5%/11) is a high-performance 80MVA voltage conversion solution engineered for 121kV/11kV power systems. Designed with a ±2×2.5% on-load tap regulation range, this transformer delivers uninterrupted precision voltage control, fully compliant with IEC 60076 and IEEE C57.12 international standards. Built with a low-loss silicon steel core, dual ONAN/ONAF cooling system, and reinforced mechanical structure, it achieves over 99.4% operating efficiency and a 40-year design lifespan, making it the ideal choice for utility providers, heavy industrial facility operators, and large-scale power infrastructure project owners.
Our 80MVA 121kV OLTC power transformer leverages premium grain-oriented silicon steel core technology, limiting no-load loss to ≤45kW and cutting long-term operating expenses by 15% compared to conventional models. Its >99.4% energy efficiency minimizes energy waste in 24/7 continuous operation, delivering measurable cost savings for high-demand power systems.
Equipped with a ±2×2.5% on-load tap changer, this 121kV/11kV step-down transformer offers 0.625% voltage adjustment accuracy, adapting seamlessly to peak demand fluctuations and variable load conditions. Its 10.5% short-circuit impedance, verified by KEMA testing, enhances grid stability and mitigates downtime risk from voltage sags or surges.
The dual ONAN/ONAF cooling system maintains a 65K average winding temperature rise across a -25°C to 50°C operating range, paired with H-class insulation and a C5-M anti-corrosion coated reinforced tank. This design ensures reliable performance in harsh environments, with a 40+ year service life and <68dB noise output for urban installations.
This 121kV high-voltage power transformer is engineered for mission-critical applications: utility grid 110kV/220kV substations, heavy industrial power plants (steel mills, aluminum smelters), renewable energy wind and solar farm collector stations, urban power infrastructure substations, and petrochemical complexes with hazardous environment requirements.
Our OLTC power transformer meets strict global standards: IEC 60076, IEEE C57.12, GB 1094, and holds UL/cUL, CE, and KEMA performance certifications. Every unit undergoes rigorous type testing, partial discharge measurement, and short-circuit withstand verification before delivery, ensuring consistent quality and long-term reliability.
With over 30 years of specialized power transformer manufacturing expertise, YAWEI delivers a 99.5% on-time delivery rate, custom engineering for extreme climate and application requirements, 2-year extended warranty options, and a 14-week lead time for most custom configurations. We have deployed over 30 units of this model globally, with 5+ years of trouble-free operation in 50+ industrial and utility installations.
