Im trying to figure out what the series-parallel capacitor configuration in a substation would be used for. Example: Each phase of the substation bus has 3 capacitor banks in series with each other. Each capacitor bank has 10 capacitors in parallel. Now each bank is going to have a high capacitance since the caps in the bank are in parallel, but then we have 3 banks which are in series with each other which is going to decrease the overall capacitance. I don't see the point in having high capacitance banks and then lowering that capacitance by connecting them in series.