How about loss of MV tuned filter?

[kia]

We measured Active, Reactive and Apparent power of tuned filters.

6.6 kV system. Indoor, Aircore reactor, Cable length < 35 meters.

1. 5th Filter#1 3.9 MVAR(Design)
P = 54 kW Q = 4.19 MVAR I = 365 A THDi < 5%(Measured)

2. 7th and 11th Filter#1 7.8 MVAR(Design)
P = 159 kW Q = 8.17 MVAR I = 711A THDi < 5% (Measured)

3. 5th Filter#2 3.9 MVAR(Design)
P = 34 kW Q = 3.95 MVAR I = 350A THDi < 5% (Measured)

4. 5th Filter#3 5.0 MVAR(Design)
P = 103 kW Q = 5.05 MVAR I = 440A THDi < 5% (Measured)

5. 7th and 11th Filter#2 5.0 MVAR(Design)
P = 136 kW Q = 5.10 MVAR I = 440A THDi < 5% (Measured)

How about loss of all MV tuned filters, Normal or Abnormal?
We calculate loss from capacitor(.12kW/MVAR) and loss from cable (I^2Rloss < 1kW) but it very less than measured value(we don't know Resistance of Reactor).
What was causes the loss of tuned filters?
Can we reduce loss of all filters? How ???

 

[jghrist]

Reducing the loss of filters increases the sharpness of the tuning. This may reduce the effectiveness in filtering out harmonics. There is a balance between reducing losses and optimizing the filter for harmonic reduction.

 

[kia]

So, how about loss of all MV tuned filters?

Normal or Abnormal.

Thank

 

[LionelHutz]

The losses of each filter seems to be 2% of the VAR or less. Seems reasonable to me.