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When we change new power capacitor (PF Improvement)?

When we change new power capacitor (PF Improvement)?

When we change new power capacitor (PF Improvement)?

(OP)
When we change new power capacitor (PF Improvement)?

Ex. Cap 50 kVAR 400V  Ir = 72.2 A  Cab = 497.36 uF(Delta connection)

In catalogue shown -5% to +10% (Tolerance 472.5 - 547.1 uF)

- Why new cap have Capacitance more than calculated value?
  Ex Ccal = 497.36 uF   Cnew = 570 uF(more than 10%)

- When we change new power capacitor?
  Cmeasured <= xx% of Ccal  or Imeasured <= xx% of Ir

RE: When we change new power capacitor (PF Improvement)?

Are you calculating the capacitance using the same voltage as the rating of the capacitor?

RE: When we change new power capacitor (PF Improvement)?

(OP)
Yes, I calculate capacitance from capacitor rated.
In Delta loop had Cx, Cy and Cz,
So when we measure at terminal AB, Cab = Cx // (Cy + Cz)

at 50 kVAR 400V  Cab = 497.36 uF

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