Transmission Equipment

Shunt Capacitor Bank

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Definition

A bank of capacitors connected between a transmission bus and ground, providing a local source of reactive power (MVAR) to support bus voltage. Shunt capacitor banks are the most common and economical form of reactive power compensation, typically switched on when voltage sags under heavy load and switched off under light load. Their reactive power output is proportional to the square of the bus voltage (Q = V² / Xc), which means their effectiveness decreases exactly when it is most needed — during low-voltage conditions following a large disturbance, a limitation overcome by dynamic compensation devices like SVCs and STATCOMs.

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Topic Deck

Transmission Equipment

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Source

FERC Pro Forma OATT / LGIP

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