# Power Quality systems Capacitor banks and substations

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#### Project Desciption

How do you answer this homework question:

Consider a 230-kV, 50 Hz substation with two 3-phase wye grounded capacitor installations. 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 inductance of the busbar be 1 µH/m. Each capacitor bank has an internal self-inductance of 10 µH. 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. Evaluate whether general purpose breaker is suitable for isolated switching of Bank#1. Is an inrush current limiting reactor required? If required, calculate the reactor value

2)Bank #2 is energised only when Bank #1 is already in service. Evaluate whether general purpose breaker is suitable for switching of Bank#2. Is an inrush current limiting reactor required? If required, calculate the reactor value.

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