Zero-sequence voltages in unit-connected generator for different methods of grounding generator neutral

In this paper, the influence of parameters of the generator and transformer, the additional capacitance to ground of the generator breakers on the zero-sequence voltages in generators during faults in the stator winding and the power system was determined. The analysis of zero-sequence components was carried out for unit-connected generators of power up to 1200 MVA. The voltage zero-sequence components feeding the measuring element of the protections were determined at faults along the whole length of the generator stator winding.