Stallcup's Transformer Theory is a pivotal publication in the field of electrical engineering, authored by James Stallcup. Published initially in 1987, this comprehensive work delves into the intricate workings of transformers, crucial devices in electrical power transmission and distribution systems. Stallcup's theory elucidates the principles governing transformer design, operation, maintenance, and safety protocols. It serves as a foundational resource for engineers, electricians, and students seeking to understand the fundamental aspects and advanced concepts of transformers, contributing significantly to the advancement and standardization of practices within the industry.