IEC 60076-21:2011 Edition 1.0 2011-12 IEEE Std C57.15 Power Transformers – Part 21: Standard Requirements, Terminology, and Test Code for Step-Voltage Regulators
Institute of Electrical and Electronics Engineers (IEEE)
Scope
Description of design types, tables of 50 Hz and 60 Hz ratings, supplementary ratings, construction, and available accessories are provided. Methods for performing routine and design tests applicable to liquid-immersed single and three-phase step-voltage regulators are described. Winding resistance measurements, polarity tests, insulation power factor and resistance tests, ratio tests, no load los...