UNE 21428-1-2:2017現行
Three-Phase Oil-Immersed Distribution Transformers 50 Hz, From 25 Kva To 3150 Kva With Highest Voltage For Equipment Not Exceeding 36 Kv - Part 1: General Requirements - Section 2: Requirements For Dual-Voltage Transformers In Low-Voltage
出版：Asociacion Espanola de Normalizacion
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