Moldoveanu, V.; Rusu, I; Marin, I.
In Romania the super fluent Distribution Networks, builds before 1989, gives to the Distribution Operator a high level of the flexibility. From the economic aspect this super fluent involves big expenses for operation and maintenance in ratio with electric power sold. The 110 kV Distribution Network studied is operating partial locked. It is include three districts and it is supplied from Transmission Network by five injection points, a Thermal Electric Power Station and ten Hydro Electric Power Stations. Safety and Economic Dispatching of load is the main objective for the Distribution Operator System and for it need to use the modern method for calculate both short-circuit and steady state.