This work presents a methodology for designing a 50 kW RF transformer operating at a frequency of 400 kHz with a view to operation with minimal magnetic losses used in the project experimental treatment of industrial wastes and effluents of petrochemical thermal plasma. This innovator model of a RF transformer offers many advantages over traditional transformers, the main ones being their small size for this power level, high power density, low electromagnetic radiation level, and easy and economic manufacturing. The equivalent circuit was obtained practically and theoretically at the university lab. From the project, simulations are made to evaluate the performance of different parameters as a function of magnetic induction, current density, and temperature.