Transformer specification course – e-lesson #7: Power transformer technical specifications – fundamental rules

This transformer specification course provides an in-depth look at the technical requirements and industry standards for building power transformers. The instructor, Marcos Ferreira, focuses on IEEE standards used in the United States, while noting the compatibility with IEC and CIGRE standards worldwide. Key topics covered include defining the transformer's scope and purpose, outlining the table of contents for technical specifications, and detailing the critical rating data like cooling classes, voltage, and impedance. The lesson also explores transformer construction, including bushings, accessories, and short-circuit testing. Particular emphasis is placed on managing transformer temperature rise and its impact on performance and lifespan. The instructor explains how transformer nameplates provide essential information and how routine factory testing verifies the design. The course concludes by highlighting the importance of transformer commissioning and warranty considerations. Throughout, the instructor provides practical guidance and reference materials to help attendees develop comprehensive transformer specifications.