Capacitor Bank maintenance

Reading the current to each capacitor phase is a good way to identify sections that have lost capacitive elements. Have a competent electrician use the properly rated clamp meter.

The current in each capacitor phase should be the bank KVAR / (L-L Volt) / 1.73 * 1000

Allow for a +/-10% variation.

The time between maintenance cycle depends on the site. If you have a lot of harmonics and or lightening strikes and or power failures, verifications on a monthly period is advisable. If you never see any change do it less often.

In addition to these checks recomended in 1 keeping the capacitor banks clean and dust free helps prenvent tracking between terminals. use a soft brush like a paint brush. and if neccessary a proprietry evaporitive cleaner such as CRC Contact Clean

Thanks to all..

But I think the use of capacitor banks (used with APFC relay) also induces harmonics into the system. So do we need to put in harmonics filter with capacitor banks?