The fields with the red border are required.

    CALCULATION OF VOLTAGE RISE WITH ADDITIONAL CAPACITORS

    The following calculators compute the approximate steady state voltage rise associated with the application of a shunt power capacitor banks and harmonic filter banks on medium voltage power systems. When applying reactive vars, it is important to calculate the resulting voltage rise. If too high, the kvar size or kvar increment of the bank should be decreased. Generally, voltage rise for single bank switching is recommended to be no higher than 3%.

    The voltage rise resulting from the application of a shunt capacitor bank is related to the system strength (i.e. KVAsc) and kvar of the bank. The voltage rise is directly proportional to the bank kvar rating and inversely proportional to the system short circuit level.

    For multi-stage power capacitor bank and harmonic filter banks, the total kvar can be used to calculate the total expected voltage rise when all stages are online. For single stage voltage rise, use the stage kvar rating.

    Calculator-1
    Input the three phase reactive power rating of the capacitor bank (stage) and the three-phase short circuit capacity in kVA to obtain the expected voltage rise.

    Calculator-2
    Input the three phase reactive power rating of the capacitor bank (stage), three-phase transformer rating, and short circuit impedance (in %) to obtain the expected voltage rise.

    Calculator-3
    Input the three phase reactive power rating of the capacitor bank (stage), System Line-to-Line Voltage Rating at the Capacitor Bank, and the three-phase phase short circuit capacity in kVA at the capacitor bank to obtain the expected voltage rise.

    Calculator-1

    Known variables: kvar, kVAsc

    Input Three Phase Capacitor Bank Rating (kvar):    
    Input Short Circuit Capacity at Capacitor Bank (KVASC):  
    % Voltage Rise: 

    Calculator-2

    Known variables: kvar, Transformer kVA, ZXFMR(%)

    Input Three Phase Capacitor Bank Rating (kvar):  
    Input Transformer Three Phase Power Rating (kVA)     
    Input Short Circuit Impedance of Transformer (%)     
    Short Circuit Capacity at Capacitor Bank (kVASC)     
    % Voltage Rise

    Calculator-3

    Known variables: kvar, System Line to Line Voltage, KVAsc

    Input Three Phase Capacitor Bank Rating (kvar):  
    Input System Voltage (kVLL)  
    Input Three Phase Short Circuit Current at Capacitor Bank (kAsc)  
    Short Circuit Capacity at Capacitor Bank (kVASC)  
    % Voltage Rise  
    Voltage at Capacitor Bank (kVLL)  
          

    Variables

















    Diagram