IEEE C57.12.52 : 2012
IEEE C57.12.52 : 2012
SEALED DRY-TYPE POWER TRANSFORMERS, 501 KVA AND HIGHER, THREE-PHASE, WITH HIGH-VOLTAGE 601 TO 34500 VOLTS, LOW-VOLTAGE 208Y/120 TO 4160 VOLTS - GENERAL REQUIREMENTS
Institute of Electrical & Electronics Engineers