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Description / Abstract:
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.