three phase oil immersed transformer
1.Double-winding structure: 35 kV main transformer level, simple wiring and stable operation.
2.Low loss & energy saving: Type 11 energy efficiency, more power-saving than traditional models with low temperature rise.
3.Oil-immersed forced-air cooling: Excellent heat dissipation, strong overload capacity, suitable for long-term full-load operation.
4.High short-circuit withstand capability: High reliability, suitable for substations and industrial & mining main step-down stations.
5.Low noise, long service life and maintenance-free.
一、Product Introduction
The SF11 series is a three-phase, oil-immersed forced-air cooled, double-winding, Type 11 low-loss power transformer.
It is mainly used in 35 kV power transmission and distribution systems, and is the mainstream main transformer equipment for substations, industrial and mining enterprises, and industrial parks.
The product adopts high-permeability silicon steel sheets and all-copper winding structure, combined with forced-air cooling design.
It features low loss, low noise, stable operation and strong overload capacity, meeting the requirements of high-efficiency, safe and long-term operation of the power grid, and conforms to the national Level 1 energy efficiency standard.
二、Technical Parameters （customizable）
Rated capacity: 630 kVA ～ 31500 kVA
Rated voltage: 35±5%/0.4 kV, 35/10.5 kV, 35/6.3 kV (customizable)
Rated frequency: 50 Hz
Connection group: YNd11, Yyn0
Cooling mode: ONAN/ONAF (Oil Natural Air Natural / Oil Natural Air Forced)
Voltage regulation: off-circuit tap changer or on-load tap changer (optional)
Insulation level: Standard insulation for 35 kV class
Implementation standards: GB/T 1094, GB/T 6451, GB/T 10228
三、Main Features
Energy saving & low loss
Adopting high-permeability oriented silicon steel sheets and 45° full-step lap joint lamination technology,
no-load loss and load loss are far lower than national standards.
It has obvious power-saving effect compared with traditional models and lower long-term operation cost.
Forced-air cooling & strong overload capacity
Equipped with forced-air cooling system for high heat dissipation efficiency.
It can meet peak load and short-time overload operation, with stable temperature rise control and longer service life.
Reliable structure & high short-circuit withstand capability
All-copper windings with high mechanical strength, firm clamping of core and coil assembly, optimized insulation structure.
It has excellent ability to withstand sudden short circuit, ensuring safe and stable operation.
Low noise & low partial discharge
Optimized core and tank structure, low vibration and noise;
low partial discharge, excellent insulation performance, suitable for long-term continuous operation.
Totally sealed & maintenance-free
Sealed oil tank structure effectively prevents transformer oil from oxidation and moisture,
reduces maintenance workload and adapts to harsh outdoor environments.
四、Application Scenarios
Main transformer / distribution transformer for 35 kV substations
Main step-down substations for industrial and mining enterprises
Power supply systems for industrial parks and commercial complexes
Urban power grid renovation, new energy supporting stations
Key power supply places such as hospitals, data centers and transportation hubs
