As an inexpensive source of reactive power, capacitor banks bring many benefits to a facility.  They are widely deployed to avoid penalties on utility bills, lower distribution losses, increase transformer/Genset capacity, maintain nominal voltage, and to reduce energy losses resulting in decreased carbon emissions. When coupled with reactors, capacitor banks can filter harmonics generated by Variable Frequency Drives (VFDs) and other non-linear loads that otherwise distort both voltage and current waveforms. This helps reduce the risks of premature insulation breakdown in motor windings and transformers, excessive heating, nuisance tripping of circuit breakers, and operational problems with sensitive equipment.

Capacitor Bank is a combination of numerous capacitors of similar rating that are joined in parallel or series with one another to collect electrical energy. The resulting bank is then used to counteract or correct a power factor lag or phase shift in an AC power supply. They can also be utilized in a DC power supply to step up the total amount of stored energy or to step up the ripple current capacity of the power supply.

Capacitor banks are generally used to

1. Power Factor Correction
2. Reactive Power Compensation

Capacitors have the opposite effect to the inductive motors where it cancels out a large current flow and thereby, this capacitor bank reduces your electricity bill.

Capacitor banks typically have a design lifetime of 20+ years, but in-service deviations from the specified operation conditions can significantly reduce operational life and result in premature failures.

Facilities managers and service providers should always be aware of the consequences for their operation if a capacitor bank fails. These can range from disrupted operations, expensive and unbudgeted repair or replacement costs, utility penalties, and other operational risks

So updating or replacing capacitor banks are highly recommended. It will avoid huge penalty from electricity company.

ZDDQ Capacitor banks

Low voltage capacitor banks

Medium voltage capacitor banks