In this paper a short-circuit computation (SCC) procedure for large-scale distribution systems with high penetration of distributed generators based on contemporary technologies is proposed.The procedure is suitable for real-time calculations.Modeling of mod distributed generators differs from the modeling of traditional synchronous and induction generators.Hence,SCC procedures found on the presumption of distribution systems with only traditional generators are not suitable in nowadays systems.In the work presented in this paper,for computation of the state of the system with short-circuit,the improved backward/forward sweep (IBFS) procedure is used.Computation results show that the IBFS procedure is much more robust than previous SCC procedures,as it takes into account all distribution system elements,including mod distributed generators.