This standard specifies the terms and definitions, usage conditions, product models, performance parameters, technical requirements, test classifications and test items, test requirements and test methods, nameplates, and signs of single-phase traction transformers used in electrified railway traction substations with AT power supply. , packaging, transportation and storage. This standard is applicable to AT power supply mode single-phase oil-immersed traction transformers with a voltage level of 110 kV~330 kV, a rated capacity of 6 300 kVA~90 000 kVA, and a rated frequency of 50 Hz. AT power supply mode single-phase oil-immersed traction transformers with other capacities may refer to this standard.