SZ22 35kV Substation Transformer High Efficiency OLTC Grid Power

The SZ22 series 35kV power transformers represent the pinnacle of JNCN Power’s engineering excellence. Developed using internationally advanced technology and rigorous manufacturing processes, these transformers are designed for urban and rural power grids, industrial and mining enterprises, and large-scale infrastructure projects.

Compared to standard national models, our energy-saving design reduces no-load losses by 20–30% and no-load current by 50–60%, reaching leading international performance levels.

• Superior Core Technology for Silent Power Constructed with ultra-thin, high-quality cold-rolled grain-oriented silicon steel sheets using a 45° full miter joint and a 3-step stacking process. This innovative structure reduces no-load losses by an additional 5%. Our specialized research into vibration dampening—including epoxy resin bonding and corrugated rubber padding—reduces noise levels by 5–10dB compared to conventional units.

• Advanced Winding & Short-Circuit Resilience The windings utilize a cylindrical structure with diamond-shaped, thermosetting epoxy-resin-impregnated paper for interlayer insulation. After vacuum drying, the windings bond into a solid, rigid mass, significantly enhancing mechanical strength and short-circuit resistance. High-voltage coils use a layered structure to ensure even impulse voltage distribution, providing superior lightning strike protection.

• Intelligent Thermal & Pressure Management Featuring a microcomputer-controlled, fully automated production line for our corrugated oil tanks. The hermetically sealed design isolates the transformer oil from the atmosphere, preventing moisture and oxidation. This "breathing" tank design automatically regulates internal pressure, while integrated pressure relief valves and oil level monitors ensure 24/7 operational safety.

• On-Load Voltage Regulation (OLTC) The 35kV side is equipped with a high-performance On-Load Tap Changer (OLTC). During grid voltage fluctuations, the transformer automatically or electrically switches taps to maintain a stable output voltage, protecting downstream equipment and improving overall power efficiency.

• Maintenance-Free "Plug-and-Play" Reliability Every unit features high and low voltage leads connected with specialized cold-press technology, eliminating risks of carbonization and ensuring high conductivity. The robust positioning system prevents internal movement during long-distance transportation, allowing the unit to be energized directly upon arrival without internal inspection.

• Altitude: ≤ 1,000 meters.

• Ambient Temperature: -25°C to +40°C.

• Max Daily/Annual Average Temp: +30°C / +20°C.

• Installation Environment: Suitable for locations free from violent vibrations, corrosive gases, or fire/explosion hazards.