Investigations concerning the Possibility of Dangerous Resonance Conditions at the Breed Plant during Unit Maintenance and Unit Start-Up

Fast restoration of a critical remote load area using a gradual voltage build‐up procedure

“…If the short-circuit current level of the island is low during the restoration, switching transients and harmonic resonances may occur. They may slow down or even prevent the restoration [2,[7][8][9][10][11][12][13][14][15][16][17][18]. Although not clearly specified, the literature implies that at first, generator voltages are raised to the nominal value, and after that the segments are connected [8-10, 15, 19].…”

“…The risks of harmonic resonances during the conventional system restoration have been widely presented in the literatures [7][8][9][10][11][12][13][14][15][16][17][18][19]. The switching operations such as transformer energisation, may excite transients, which have a frequency range close to the system resonance frequency.…”