Concept and requirements of a simulator for substation automation systems

Increase of dispersed generation in medium-voltage-grids and lack of practical experience with new standards form dangerous impacts on current control- and protection functions that are part of substation automation systems. To overcome these problems a simulator proposed, that supports the development of new protection systems and provides practical training opportunities in terms of IEC 61850. Real secondary equipment forms a substation, while the subimposed process, the primary equipment of the substation and the ambient power system, is simulated with a real-time simulator. Amplifiers are coupled to the simulator and allow for the emulation of the secondary currents and voltages of instrument transformers at a maximum frequency of up to 20 kHz. Conclusively relevant fault scenarios including transients during earth faults can be simulated.