Mathematical modeling of the auxiliary system 6 KV in Kozloduy NPP

In the article the setup and the operation of mathematical model of the auxiliary system 6V in the Kozloduy NPP are described. The model is worked out with the help of the program products Matlab and Simulink. All mechanisms are presented by a mathematical model of electro-machinery aggregate operating by induction motor. Different rates of operation are realized, while supplying from operating or stand-by transformer, as the variation of the current and the voltage at the time of the transient mode, is reading. The model gives opportunity for diagnostics of the aggregates, for investigation of different operation models and for damages analysis. The model is a good instrument for training of the operative staff. (authors)