Differences between fixed and switched capacitors
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Capacitor banks are used to improve power factor in supply system and industry.
Banks in industry can be connected permanently across large motors, or at supply mains, and remain in service so long as the load is connected, when it may be switched off. In such case, corrected power factor keeps varying depending on load conditions. In case these fixed capacitors are not disconnected after working hours, or when load is switched off, the power factor will actually go down drastically.
Automatic power factor control panels (APFC panels) are commonly used in many industries to sense load power
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