capacitor bank use for pf

The way we used to check large capacitor banks in our transmitter unit, was to time its discharge cycle through a large wire wound resistor of known resistance. This would give us the RC time constant and thus its capacitance.

By rule of thumb current measurement(to the capacitor) is a good indication of the condition of the capacitors ,IF all the phases have the same inductive load than the current flow will be the same.

reliable way is to use a capacitor meter to measure tha capacitance of each of the capacitor,the reading should be withine +/- 10% of the name plate.

But if your PF is being maintained by the Caps ,you only need to regularly take the current readings and record in a log book,this will give you a good history to refer when in doubt.