Optimizing Transformer Specification Based on Application and Rating

In today’s fast-paced world, technology is evolving rapidly and impacting every field. When it comes to transformers, the fundamentals haven’t changed, but there are several new innovations that can aid with maintenance, protection and increasing the life of the asset. IEEE C57.12.10 provides standard requirements for power transformers. Beyond the standard requirements, user specification can cover a wide range of design parameters and options. Applying the same requirements for the entire range of transformers on a project may lead to gold-plating and increased cost. On the other hand, critical applications may require more careful consideration and investment. Example of some common questions that may arise-Should one specify high temp fluids or stay with mineral oil? Should sealed type or conservator type preservation system be specified? How far can one deviate from standard impedance before it has a significant impact on cost? Is standard Basic Insulation Level (BIL) adequate or is enhanced BIL required? Should maximum core flux density be specified? Should one specify online monitoring? This paper will explore many of the parameters and options that can be selected and specified by users taking into consideration recommendations from IEEE and transformer industry best practices. The goal is to provide guidance based on rating and application that may enable users to optimize and bring the best value for their project.