Детальная информация

This masters thesis studies overvoltages in a 220 kV network and selects the main characteristics of a 220 kV metal-oxide surge arrester for insulation protection of electrical equipment. An EMTP-RV model of the Krivoporozhskaya Hydroelectric Power Station network was developed and verified by three-phase and single-phase short-circuit calculations. Planned line closing, incomplete-phase switching, and successful automatic reclosing were simulated. The results show that line surge arresters reduce switching overvoltages, while voltage transformers affect residual voltage decay before reclosing. The permissible switching residual voltage was set at 412 kV; the calculated switching current was 893 A, and 1000 A was accepted as the design current. The required specific energy was 2.73 kJ/kV. Based on these results, the ОПНп-220/1000/154-10-IV УХЛ1 arrester was selected.