The EU FP7 ECCOFLOW is aimed at developing and testing a 24 kV-1kA Superconducting Fault Current Limiter (SFCL) able to satisfy the specifications of two different grid installation sites of practical interest: San Juan de Dios substation (Palma de Mallorca – Spain) belonging to the Spanish utility ENDESA and ES Juh substation (Kosice-Repubblica Slovacca) belonging to the Slovak utility VSE. In this work, we reported on fault simulations aimed at the study and conceptual design of a resistive-type 3-phase SFCL demonstrator for the aforesaid two case studies. The simulations performed fully describe the behaviour of SFCL devices made by means of the stateof- the-art commercially available 2G HTS composite conductors, at nominal and limiting conditions. These results are very important to study the impact of SFCL on electric networks andto give useful hints to the design of practical SFCL devices, since a FCL with small impedance at nominal operation and very fast increase of impedance at fault conditions almost becomes a necessity to meet future power system requirements. Simulation results showed that in case of fault, the SFCL significantly reduces the peak short-circuit current at the very first current rise. In fact, in the presence of the SFCL, in few milliseconds the prospective peak short circuit current of about 26 kA is effectively reduced down to 10 kA. Within the first 12 months of the project the specification for both applications has been worked out and an appropriate conceptual design of the SFCL system has been conceived. A next major step is to complete the ongoing electrical, mechanical, and thermal measurements in order to fix the detailed SFCL design for construction . This work has been financed by the Research Fund for the Italian Electrical System under the Contract Agreement between RSE S.p.A. and the Ministry of Economic Development – General Directorate for Nuclear Energy, Renewable Energy and Energy Efficiency in compliance with the Decree of March 8, 2006.