A novel prototype design for a transformer for high voltage, high frequency, high power use

A prototype transformer has been designed and built which is novel in its c ombination of high voltage (50 kV), high frequency (20 kHz) and high power (25 kVA) specifications. The design technique utilized a spreadsheet approa ch which facilitated an iterative design procedure, The transformer used a ferrite! core, nylon insulated secondary bobbins and pressurized sulfur hex afluoride encapsulation. It was designed as part of a high-voltage switched -mode power supply for driving electrostatic precipitators. The transformer was field tested at a large coal-fired power station and was found to have an efficiency of butter than 98%.