부산대학교 도서관

Capacitor banks are critical substation assets that play a vital role in providing reactive power support, thereby increasing the power system capacity. High-voltage capacitor banks are constructed as single-wye, double-wye, or H-bridge configurations and can be grounded or ungrounded. Capacitor banks consist of a number of single-phase capacitor units connected in series and parallel to achieve the desired voltage and VAR rating. The capacitor units can be externally or internally fused, fuseless, or unfused. When the unbalance resulting from unit or element failures becomes too high, the capacitor bank needs to be taken out of service by the protection system before the resulting unit overvoltages lead to a cascading failure and the faulty units must be replaced.