What's the need of stages in a Power Factor Improvement for an inductive load with capacitor banks ?What's the need of stages in a Power Factor Improvement for an inductive load with capacitor banks ? How to create the control wiring of Power Factor Improvement Capacitor Bank ? Why there are equal amount of contactors to the equal amount of capacitors ? How to calculate the Contactors Power Capacity and... | |
1. Stages are needed where the load consists of a number of individual pieces of equipment that may be turned on and off at various times.
2. Control is usually done by using measurement equipment to determine the power factor of the load and connecting or disconnecting compensating capacitors to achieve the desired power factor. One 3-pole contactor per capacitor would allow the capacitors to be connected or disconnected one at a time. Fewer contactors could be used to connect and disconnect groups of capacitors.
3. Contactor power capacity is matched to VA rating of capacitors to be switched. Contactors need to be classified as suitable for capacitor switching. Coil voltage is coordinated with selected pilot relays or driver circuits. Capacity rating is selected for desired increments to reach total VAR of compensation required per load study. Discharge resistors selected per capacitor rating and discharge time set by safety requirements.
I see four distinct questions here.
1. I don't know that there is a need for stages in power factor improvement.
2. You create the control wiring for a capacitor bank by following the wiring diagram.
3. I don't know that the number of contactors always equals the number of capacitors.
4. You determine the control power ratings based on the accommodation to the available control power in the facility where the bank is to be located.
