UNE 21428-1-1:2004被替代
Three-phased Oil-immersed Distribution Transformers 50 Hz, From 50 To 2500 Kva With Highest Voltage For Equipment Not Exceeding 36 Kv - Part 1: General Requirements - Section 1: Requirement For Multi-voltage Transformers In High-voltage
出版：Asociacion Espanola de Normalizacion
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