UNE 21428-1-1:2017现行
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 1: Requirement For Dual Voltage Transformers In High-Voltage
出版：Asociacion Espanola de Normalizacion
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