This standard covers certain electrical@ dimensional@ and mechanical characteristics and safety features of single- and three-phase@ 60 Hz@ mineral-oil-immersed@ self-cooled@ overhead-type distribution transformers 500 kVA and smaller@ high voltages 34 500 V and below and low voltages 7970/13 800Y V and below.
C57.12.20-2005由IEEE - The Institute of Electrical and Electronics Engineers@ Inc. 发布于 2005-06-09,并于 2011-09-22 实施。
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