... : Factory direct sale, most competitive price. 1. Technical Data 33KV S9 Series three Phase Oil Immersed Distribution Power Transformer ... Short Circuit Impedance: Standard impedance (For details see technical data sheet)Features: S9 33kV transformer equipped characters as low loss, low ... the wall of tank is as wave form. Technical Data of 33KV S9 Series Three Phase Oil Immersed Distribution Transformer ...