for power factor correction kVAR
for lasers Joules
if you make them with capacitors and know the voltage and frequency you can figure either from microfarads
energy =joules=kg-meters=watt -seconds= (C * e^2)/2
var = X(c) * e
If you are talking about a capacitor bank used for power-factor improvement, then it is rated in reactive volt amperes (var). Otherwise, it is rated in farads (F).
by using capacitor on the line we can reduce spike current or we can use a capacitor bank for the rated line capacity.
Use of rvt in capacitor bank
Capacitors are rated in Microfarads
Series reactors may be used in switching in capacitor banks. These are used to minimize the transient voltage spikes on the system resulting from switching in a 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!
The primary reason for a capacitor bank in an electrical substation is for power factor correction. There may also be some secondary purpose for the capacitor bank but the primary reason is power factor correction.
capacitor bank
It depends upon at how much voltage level 400 kvar capacitor bank is used.
It doesn't ?
If the motor is rated at 370 v and the supply is 370 v, the capacitor needs to be rated at 370 or more volts, so a 440 v capacitor will be OK.
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.