This guide describes selection and application considerations for the unit power transformer and unit auxiliaries power transformer. Consideration is given to connections that include direct connection and connections through generator circuit breakers and load-break switches. The considerations referred to in this guide apply to hydroelectric and thermal electric generating stations. Various power transformer connections and possible operating problems under normal and abnormal conditions are treated. Phasing procedures@ basic impulse insulation level selection@ and loading practices are not covered. Purpose The terminology@ function@ application@ theory of operation and protection@ and design of unit power transformers and unit auxiliaries power transformers are not covered by existing transformer standards and guides. The purpose of this document is to provide guidance for specifying@ designing@ and applying these types of power transformers.
IEEE C57.116-2014 history
2023IEEE C57.116-2022 IEEE Guide for Transformers Directly Connected to Generators
2014IEEE C57.116-2014 Guide for Transformers Directly Connected to Generators
1989IEEE C57.116-1989 Guide for Transformers Directly Connected to Generators