Shunt Capacitor Banks
Shunt Capacitor Banks - Related Videos
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FAQs
The key mechanism is phase compensation: capacitor current leads system voltage, while inductive equipment draws lagging reactive current. Their reactive components partially cancel at the network connection point, so the source supplies less net reactive current without changing the useful real-power demand. This phase relationship explains why capacitor banks can improve power factor and support bus voltage.
Reducing reactive current lowers the current carried by lines and transformers for a given operating load. That can reduce associated losses and release transmission capacity, while the voltage improvement helps equipment operate on a better-supported bus. The benefit depends on matching bank output to the network’s reactive demand; excessive compensation can instead create undesirable voltage conditions.
Fixed banks keep compensation connected, whereas switched banks allow the connected compensation to be adjusted through system operation. The choice therefore depends on how stable the reactive-power requirement and voltage conditions are at the installation point. Control is especially important when connection or disconnection could cause overvoltage or switching transients.
Sizing should correspond to network reactive-power requirements and operating voltage conditions. The control strategy should determine when bank sections are connected or disconnected, particularly where demand changes. Engineers also check that compensation does not produce overvoltage, excessive switching transients, or resonance with system harmonics. These checks balance efficiency gains against power-quality and equipment-stress risks.
Common installation points include distribution feeders, substations, and industrial plant buses. At each location, engineers can use the bank to address local reactive-power demand, support the bus voltage, and reduce current in upstream network elements. The selected site also needs coordination with the system’s operating conditions so efficiency gains do not introduce overvoltage or harmonic resonance.
Performance should be judged by both electrical benefit and operating risk. Relevant outcomes include improved power factor, lower line current, reduced losses, supported voltage, and released transmission capacity. Engineers must also check for overvoltage, switching transients, and resonance with system harmonics, because a bank that improves one measure can still create unacceptable network conditions if poorly sized or controlled.