ABSTRACT
Transformers are equipped with an array of ancillary equipment in order to survive and function in the field. This chapter describes how this equipment is designed, how it functions, and how it should be maintained. The proper design and maintenance of ancillary equipment is just as important as the proper design and maintenance of the transformer itself and can present its own set of problems, since unlike the transformer proper, ancillary equipment may contain moving parts that are subject to wear. Many transformer failures have been the result of carelessness with regard to ancillary equipment.
