Final answer:
The bushings for each phase in a multi-unit three-phase capacitor bank are connected in parallel. This arrangement contrasts with a series combination, where the total capacitance decreases due to increased plate separation.
Step-by-step explanation:
If more than one three-phase unit is used in a capacitor bank, the bushings for each phase are connected in parallel from unit to unit. When capacitors are connected in parallel, each capacitor is connected directly to the voltage source. This connection results in the total capacitance being the sum of the individual capacitances, which is crucial for maintaining the necessary power factor correction in electrical power systems.
In contrast, a series combination in a circuit has components arranged one after the other. In a series combination of capacitors, the total capacitance is less than any of the single capacitor's capacitance since the effective plate separation increases, resulting in smaller total capacitance, as explained with Figures 8.11 and 8.12, and conservation of charge. An AC Voltage in a Capacitor causes the voltage to follow the current by a 90° phase angle. This knowledge plays an important role in power systems where AC voltage is commonly used.