DIN 42500-21 : 1995被替代
THREE PHASE OIL-IMMERSED DISTRIBUTION TRANSFORMERS 50 HZ, FROM 50 TO 2500 KVA WITH HIGHEST VOLTAGE FOR EQUIPMENT NOT EXCEEDING 36 KV - DISTRIBUTION TRANSFORMERS WITH CABLE BOXES ON THE HIGH VOLTAGE AND/OR LOW VOLTAGE SIDE; GENERAL REQUIREMENTS
出版：German Institute for Standardisation (Deutsches Institut für Normung)
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