Concept design of CFETR steady-state electrical network

Chinese Fusion Engineering Testing Reactor (CFETR) will be the first fusion energy generation device of China, which is based on the structure of ITER-like superconducting tokamak. The fusion power of CFETR is designed at 50-200MW in its first phase and its duty cycle is designed as 0.3-0.5. In order to optimize its steady-state electrical network (SSEN), the T-type transformer model is used to analyze the influence of the short-circuit impedance on the voltage regulation factor, the reactive power loss and the short-circuit current. Then the ITER-like lower short-circuit impedance will be implemented in the 500 kV main step-down transformers. In accordance with the comparisons of the annual operating cost, the 10-year comprehensive loss and the efficiency between the silicon steel transformers and the amorphous transformers, the amorphous core can be adopted in the 22 kV distribution step-down transformers to realize high efficiency for energy saving.