Szukana fraza: [Abstrakt = "The specificity of the DC transmission systems creates a lot of problems if you wish to model these systems in short\-circuit programs. Short\-circuit programs are mainly used to determine the size of short\-circuit in the convention states of quasi\-state. They lack the ability of mapping transients state. The article presents a simplified approach to modeling HVDC systems in the short\-circuit calculations based on the idea of regulated current sources."]