An automatic self regulating capacitor bank is for what purpose ?

An automatic self regulating capacitor  banks are banks that correct the 

whole of an installation’s power factor. 

The total reactive power that they can supply is divided into steps made up of 

suitably powered capacitors. The combination of these capacitors allow power 

generated to be matched to demand over a period of time. 

Being automatic equipment, once it is installed it does not require any special 

maintenance nor handling. Only certain safety procedures need to be followed on 

connecting. 

to improve power factor

improve power factor to avoid penalty by electricity authorities

Power factors control 

To Controlling The power And also for the protection of circuit ,to regulate the voltages as well 

This is for power factor correction , for variable loads

it will use to improve the inductive load as capactive load and mantain power factor..