Research on Characteristics and Selection of De-excitation Resistance of Hydro-generator

With the continuous increase of the installed capacity of hydroelectric generators, the excitation current that provides the magnetic field for electromagnetic induction is also increasing. When the system fails, the rapid, safe and reliable demagnetization of the generator set has become an urgent issue to be solved. In this paper, to dynamically analyze the demagnetization process of the hydro-generator, considering the influence of the saturation of the rotor core on the demagnetization time, the demagnetization performance of different types of demagnetization resistors is compared. The electromagnetic transient analysis software ATP-EMTP was used to establish a hydro-generator de-excitation simulation model and carried out the above research. This paper has an important reference value for the design, manufacture, and failure analysis of generator de-excitation resistance.