Detailed Introduction: The S11–S13 series of 10kV–35kV class low-loss off-circuit tap-changing transformers offers excellent economic performance. Compared to the S9 series, the S11–S13 series reduces no-load losses by an average of 30% and decreases no-load current by 70%–85%. Long service life: The transformer tank features a fully sealed structure; the tank body and rim are connected via bolting or welding, preventing the transformer oil from coming into contact with air, thereby extending service life. High operational reliability: Components related to tank sealing have been improved to enhance reliability, and manufacturing processes have been upgraded to ensure seal integrity.

The S11–S13 series of 10kV–35kV class low-loss off-circuit tap-changing transformers offers excellent economic performance.
Compared to the S9 series, the S11–S13 series reduces no-load losses by an average of 30% and decreases no-load current by 70%–85%.
Long service life
The transformer tank features a fully sealed structure; the tank body and rim are connected via bolting or welding, preventing the transformer oil from coming into contact with air, thereby extending service life. High operational reliability.
Components related to tank sealing have been improved to enhance reliability, and manufacturing processes have been upgraded to ensure seal integrity.
Compact footprint
The S11-M and S13-M series transformers utilize corrugated fin radiators for the tank; the thermal expansion and contraction of the corrugated fins accommodate oil temperature fluctuations, eliminating the need for a separate oil conservator. The corrugated fin tank offers an aesthetically pleasing appearance and a compact footprint.