Capacitance Calculations

The formulas can be found here.

http://www.nepsi.com/formulas.htm

More technical information can also be found on the site including here.

http://www.nepsi.com/del_new.htm

Obviously you need to be careful and take all necessary steps to ensure the capacitors are discharged before replacing, and shorted so they don't recharge due to memory effect and cause a nasty surprise (like they did to a coworker who serviced a previously discharged capacitor bank and forgot to do so).

The Formulae are as under:

Xc= 1/(2∏fC)

Xc=(Kv²)* 1000/Kvar

C=(Kvar*1000)/((2∏f)*(Kv²))

Kvar=1000*(Kv²)/Xc

Where

f = Frequency

C = Capacitance

Xc = Capacitive reactance

Kvar = Kilo Reactive Power

Kv = Kilo volts