What is the S9-(M), S10-(M), S11-(M) 50~3150/35 transformer typically used for?
Answer: The key difference is the voltage regulation method:
SZ series (e.g., SZ9/10/11) are on-load tap-changer transformers, allowing voltage adjustment while
energized. They are suitable for grids with frequent voltage fluctuations.
S series (e.g., S9/10/11) are off-circuit tap-changer transformers and must be de-energized for voltage
adjustment. They are commonly used in stable distribution networks.
Both are three-phase oil-immersed transformers rated 35kV with capacities from 1000 to 31500 kVA.