IEEE C57.12.40-2017
IEEE C57.12.40-2017
IEEE Standard for Network, Three-Phase Transformers, 2500 kVA and Smaller; High Voltage, 34 500 V and Below; Low Voltage, 600 V and Below; Subway and Vault Types (Liquid Immersed)standard by IEEE, 08/31/2017
standard by IEEE, 08/31/2017