This standard specifies the terms and definitions, performance parameters, technical requirements, test items, marking, lifting, transportation and storage of single-phase oil-immersed distribution transformers. This standard applies to single-phase oil-immersed distribution transformers (hereinafter referred to as transformers) with voltage levels of 6 kV and 10kV, rated capacities of 5kVA~160kVA, and rated frequencies of 50 Hz.