Bezpieczeństwo eksploatacji generatorów ze względu na zagrożenia ziemnozwarciowe

Optimization of operating conditions of ground-fault protection systems for unit-connected generators may be achieved solely after estimation of effects of ground-faults in generator stator winding, with simultaneous consideration both stator core and insulation damages, and ground-fault overvoltages. In this paper estimation of ground-faults effects in generators with neutral isolated and grounded through resistor was presented. Both ground-fault damages and ground-fault overvoltages were considered. The analysis was performed for 200 MW unit-connected generator running in domestic power system.