The SZ11 Three-Phase Oil-Immersed Transformer is a high-performance medium-voltage transformer designed for power grid voltage regulation. It uses oil immersion as the main insulation and cooling medium, ensuring efficient heat dissipation and stable electrical performance. Unlike traditional transformers, the SZ11 features a corrugated oil tank and optimized core design, reducing energy loss and operating noise. It has passed national energy efficiency class 2 certification, making it an eco-friendly choice for modern power grids. Equipped with an on-load tap-changer (using vacuum arc extinguishing), the transformer delivers precise voltage regulation—critical for end grids with large voltage fluctuations. It serves as a core device in power systems, ensuring stable voltage for industrial, commercial, and residential users.
The SZ11 Transformer uses high-quality silicon steel sheets and an optimized electromagnetic structure, reducing no-load loss by 10% below national standards. This efficiency lowers operational costs and aligns with green energy goals.
The on-load tap-changer (with vacuum arc extinguishing) offers multiple voltage regulation taps and ±0.5% accuracy. This ensures stable voltage output even when the grid fluctuates, meeting the needs of precision equipment (e.g., medical devices, data center servers).
The corrugated oil tank provides a large heat dissipation area, enhancing cooling efficiency without external fans. This design reduces noise and eliminates fan maintenance, making the transformer suitable for noise-sensitive areas. The fully sealed tank also minimizes oil leakage, ensuring long-term reliability.
The transformer’s windings use strengthened insulation, increasing mechanical strength significantly. This allows it to withstand short-circuit currents, preventing internal damage and ensuring continuous operation during faults.
The core adopts stepped seams and shock absorption pads, reducing operating noise compared to traditional models. This makes it ideal for residential areas, hospitals, and commercial centers where noise is a concern.
The SZ11 Three-Phase Oil-Immersed Transformer complies with national energy efficiency class 2 standards, ensuring high energy performance. It is designed for 10-35kV medium-voltage systems, with a voltage regulation range to adapt to grid fluctuations. The transformer uses oil immersion for insulation and cooling, with a corrugated oil tank that enhances heat dissipation. The on-load tap-changer uses vacuum arc extinguishing, supporting a high number of switch operations for long-term reliability. The windings’ strengthened insulation enables it to pass short-circuit tests, while the core’s stepped seams reduce noise. The fully sealed tank has a minimal annual oil leakage rate, minimizing maintenance.
Hub Substations
Hub substations are critical for grid distribution—they rely on the SZ11 Transformer for voltage regulation, ensuring stable power transmission to downstream networks (e.g., urban grids, industrial zones).
Shopping malls, office buildings, and hotels require stable power for lighting, air conditioning, and electronic equipment. The SZ11’s low noise and high efficiency make it suitable for these areas, avoiding disruptions to occupants.
Industrial Parks
Industrial facilities (e.g., automotive plants, electronics factories) have fluctuating power demands. The transformer’s precision voltage regulation and short-circuit resistance ensure stable power for machinery, preventing production downtime.
End Grids with Voltage Fluctuations
Remote rural or mountainous grids often experience large voltage swings. The SZ11’s on-load tap-changer adjusts voltage in real time, ensuring reliable power for residential and agricultural users.
What is the benefit of the corrugated oil tank?
The corrugated oil tank provides a larger heat dissipation area, improving cooling efficiency. Its flexible structure accommodates oil expansion/contraction, reducing tank damage risk and oil leakage.
Can it be installed near residential buildings?
Yes. The SZ11 Transformer’s low-noise design (stepped core seams + shock absorption pads) makes it suitable for residential areas, with noise levels that comply with local regulations.
How does the on-load tap-changer work without power interruption?
The on-load tap-changer uses vacuum arc extinguishing to switch taps without disrupting power. This ensures continuous voltage regulation, critical for sensitive loads like hospitals or data centers.
