NFC 52 112-4:1995现行
Three-phase Oil-immersed Distribution Transformers 50 Hz, From 50 To 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：Association Francaise de Normalisation
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