UNE 21428-4:1996被替代
Three Phase Oil-immersed Distribution Transformers 50 Hz, From 2500 Kva With Highest Voltage For Equipment Not Exceeding 36 Kv - Part 4: Determination Of The Power Rating Of A Transformer Loaded With Non-sinusoidal Currents
出版：Asociacion Espanola de Normalizacion
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