Calcolatore Corrente di Cortocircuito — Formula

Power Factor Correction

Low power factor means the utility must deliver more current (and apparent power) than the load actually uses. Capacitor banks supply reactive power locally.

Formula

kVAR needed = kW x (tan(arccos(PF_current)) - tan(arccos(PF_target)))

Benefits

  • Reduced utility power factor penalties
  • Lower line current (smaller cables, less loss)
  • Freed transformer and distribution capacity

    • Most utilities penalize power factors below 0.90. Correcting to 0.95 is a common economic target.

    Esempio Risolto

    100 kW load at PF 0.75, correcting to PF 0.95.

    1. Current angle: arccos(0.75) = 41.41 degrees, tan = 0.8819
    2. Target angle: arccos(0.95) = 18.19 degrees, tan = 0.3287
    3. kVAR needed: 100 x (0.8819 - 0.3287) = 55.3 kVAR
    4. kVA reduction: 100/0.75 - 100/0.95 = 133.3 - 105.3 = 28.1 kVA