The development of toroidal core transformers for medium-voltage applications is a project supported by the US Department of Energy under Grant DEOE0000072. The idea is to benefit from the virtues of the toroidal construction to manufacture, test and install toroidal transformers suitable for power distribution applications.

For more information, please check the following links.

• Brief details
• P. Gómez, F. de León, and I. Hernández, “Impulse Response Analysis of Toroidal Core Distribution Transformers for Dielectric Design”, IEEE Transactions on Power Delivery, Vol. 26, No. 2, April 2011, pp. 1231-1238.
• S. Purushothaman and F. de León, “Heat Transfer Model for Toroidal Transformers”, Transactions on Power Delivery, Vol. 27, No. 2, April 2012, pp. 813-820
• I. Hernández, F. de León, and P. Gómez, “Design Formulas for the Leakage Inductance of Toroidal Distribution Transformers”, IEEE Transactions on Power Delivery, Vol. 26, No. 4, October 2011, pp. 2197-2204
• F. de León, S. Purushothaman, and L. Qaseer, “Leakage Inductance Design of Toroidal Transformers by Sector Winding”, IEEE Transactions on Power Electronics, Vol. 29, No. 1, January 2014, pp. 473-480