20 kHz, 25 kVA node power transformer

The electrical and mechanical design information and the electrical and thermal testing performed on the 440-208 V RMS, 20 kHz, 25 kVA prototype node transformer are summarized. The calculated efficiency of the node transformer is 99.3% based on core loss and copper loss test data, and its maximum calculated load regulation is 0.7%. The node transformer has a weight of 19.7 lb and has a power density of 0.8 lb/kW. The hot-spot temperature rise is estimated to be 33° above the cold plate mounting base. This proof-of-concept transformer design is a viable candidate for the Space Station Freedom application