Covers certain electrical, dimensional, and mechanical characteristics and takes into consideration certain safety features of three-phase, 60-Hz, liquid-immersed, secondary network transformers with a three-position grounding switch, subway and vault types rated 25000 KVA and smaller; primary 34 400 volts and below; secondary 216Y/125 volts and 480Y/277 volts interchangeability; and safety of the equipment described. Also assists in the proper selection of such equipment.
Số hiệu tiêu chuẩn
ANSI C 57.12.40
Tên tiêu chuẩn
Subway and Vault Types (Liquid Immersed) - Requirements
Ngày phát hành
2000-00-00
Tiêu chuẩn tương đương
IEEE C 57.12.40 (2000), IDT * NEMA C 57.12.40 (2000), IDT
Từ khóa
Applications * Dimensions * Electrical properties and phenomena * Mains transformers * Mechanical properties * Properties * Replaceability * Safety * Safety requirements * Specification (approval) * Transformers * Electrical properties * Power transformers * Implementation * Use