A New Concept For A Compressed Gas-Insulated Power Transformer

A power transformer concept based on compressed-gas insulation, sheet-wound coils, polymer film insulation within the coils, and forced liquid cooling is discussed. Coil insulation structure, high voltage insulation from coil to ground, eddy current generation, and cooling aspects of the design have been examined analytically and experimentally. The concept shows promise as a means of increasing the power density of power transformers. No insurmountable technical barriers have been identified in the work conducted to date, but considerable development is required before the potential benefits of the concept can be realized. A novel core configuration, suitable for single-phase, compressed gas-insulated transformers is also described.