Capacitor banks can improve the power factor if the load is leading, which is unusual. Typically in substations capacitor banks are employed to reduce over voltage.
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As capacitor are needed to store energy it is necessary to increase the total capacity therefore add in parallel to increase storage. And the word BANK was used to imply just that
Use of rvt in capacitor bank
Adding a capacitor bank makes absolutely no difference whatsoever to the amount of energy consumed (in kilowatt hours). The capacitor bank might reduce the load current, but this does not affect the amount of energy consumed. Anyone who tries to sell you a 'capacitor bank' in order to save you energy is selling a SCAM!
It depends upon at how much voltage level 400 kvar capacitor bank is used.
Cable sizing is based on amperage of the load. The rating of the capacitor bank and the voltage at which it operated need to be stated to give an answer.
Reduce the harmonic current in the electrical supply system.