Dynamic simulation of the nuclear power plant auxiliaries

The scale and complexity of present day power systems are increasing. To plan and design such a system, it is necessary to have computer models for both the transmission grid and the power plant in detail. As an example of computer simulation support for designers, this paper presents the upgrading procedure of 6 kV bus transfer system in a large nuclear power plant. There are described some important features of the NPP electrical diagram and issues connected with bus transfer and its simulation. The paper outlines a general purpose automaton model used for relays and protection systems simulation. Several examples of transient phenomena computation illustrate using the advanced network simulator MODES for power system analysis and protection design.