ENSC 813 AU Power Quality Systems Capacitor Banks and Substations Questions
Question Description
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Consider a 230-kV, 50 Hz substation with two 3-phase wye grounded capacitorinstallations. The adjusted rating of each 3-phase capacitor bank is 85-MVAr at 230-kV. The two capacitor banks are separated by a 41-m long busbar. Let the inductanceof the busbar be 1 µH/m. Each capacitor bank has an internal self-inductance of 10µH. Let the system short circuit capacity (SCC) be 11,000-MVA.
1) Bank#1 is automatically energized when the substation voltage is 0.98 pu. Evaluatewhether general purpose breaker is suitable for isolated switching of Bank#1. Is aninrush current limiting reactor required? If required, calculate the reactor value
2)Bank #2 is energised only when Bank #1 is already in service. Evaluate whethergeneral purpose breaker is suitable for switching of Bank#2. Is an inrush currentlimiting reactor required? If required, calculate the reactor value.
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