Can we use this formula for a 3 phase LC filter?
f=1/(sqrt(L*C)*2*pi)

Does the capacitor configuration, Delta or Y, will affect the formula?

Thanks

 

Responding to FLH's Mon, Mar 15, 8:37pm query:

The formula for fundamental frequency is unaffected by capacitor configuration. However, the resutant value will change!

Regards,
Phil Corso, PE {Boca Raton, FL, USA}
[[email protected]] ([email protected]) {[email protected]}

 

> f=1/(sqrt(L*C)*2*pi) <

This is the formula for resonant frequency for ideal LC filter. What formula are you looking for? If you are trying to make a frequency domain analysis, you can use Laplace transform methods, taking into account of the internal resistances of L and C.

You can make the analysis for a single phase system and simply multiply the results by 3 or sqrt(3) depending on what you are calculating.

By the way, an LC filter can be low-pass or high-pass depending on the combination of L and C. "The" formula you are asking for will completely change for both cases.

 

What would be the formula for calculating the cutoff frequency for a low-pass LC circuit with a cap. then two induct. in series, followed by another cap. in parallel with the first cap.?