IEC 61378-2 pdf download.Convertor transformers 1 General 1.1 Scope This part of IEC 61378 applies to oil-immersed three-phase and single-phase convertor transformers for use in HVDC power transmission. It applies to transformers having two, three or multiple windings. This standard does not apply to – convertor transformers for industrial applications (see IEC 61378-1); – convertor transformers for traction applications (see...