IEEE C57.12.20-2005
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Standard for Overhead Type Distribution Transformers, 500 kVA and Smaller: High Voltage, 34500 Volts and Below; Low Voltage, 7970/13800Y Volts and Below
This project is a revision of an existing product standard covering 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 34500 volts and below with Low Voltages 7970/13800Y volts and below.
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