Advancements in Resiliency Transformers: Case of a 58/65/93 MVA Reconfigurable Area Station Transformer

The paper presents the development and deployment of a new generation of resiliency transformers, focusing on a highly versatile 58/65/93 MVA reconfigurable area station transformer (AST) engineered for rapid response and enhanced grid resilience in urban environments such as New York City. The transformer utilizes an advanced insulation system based on aramid paper and aramid pressboard, combined with synthetic ester liquid, which materials provide superior thermal stability, dielectric strength, and fire safety. This insulation system enables safe operation at higher temperatures and supports demanding overload requirements, with the transformer capable of operating at hot spot temperatures up to 220°C.