A Comprehensive Design Procedure for High Voltage Pulse Power Transformers

In this paper, a comprehensive design procedure for high voltage pulse power transformers is presented. The procedure is based on the finite element method (FEM) and contains an electrical model, a magnetical model, a thermal model of the transformer and a procedure for the isolation design. In addition, to avoid overvoltages within the winding, a model for the dynamic voltage distribution is included in the approach, as well. For validation of the models and the design procedure, a prototype has been built. There, the main focus is on evaluating the parasitics, which are crucial for the shape of the output voltage pulse. Further, the isolation design will be proofed by high voltage impulse tests. In the considered application, the required nominal pulse voltage amplitude is 44.2 kV with a pulse power of 4.42 MW, a pulse length of 5 µs and a maximal rise time of 1 µs.