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Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Yes, in theory, because as you suspect, the capacitance can 'cancel' the effects of the effective source inductance but No, because the current available is usually limited by overheating of the winding resistances etc, the effective source inductance is not the limiting factor.
EDIT: where you see 'effective source' above I originally wrote 'leakage', which is not correct.
P.S. 's . I assumed an alternator but the principle is similar for a transformer- if the transformed in-circuit primary impedance is included in your calculations. . The cost of the capacitor required vs. 'savings' may need consideration.
Registered Member #11591
Joined: Wed Mar 20 2013, 08:20PM
Location: UK
Posts: 556
As Sulaiman said, all that will do is remove the current limiting effect of the leakage inductance and make it easier for whatever is driving your transformer to explode due to over current (dependant on application). It would not reduce the power loss from the transformer.
In other words, it would decrease reactive power to the transformer, leave real power unchanged, and leave the output unchanged with a reduced current limiting capability.
Registered Member #61406
Joined: Thu Jan 05 2017, 11:31PM
Location:
Posts: 268
Another forum mentioned power factor capacitor, based along the same lines. How would you select the values, would it just be parrellel resonance. cheers
Registered Member #11591
Joined: Wed Mar 20 2013, 08:20PM
Location: UK
Posts: 556
If you want it to be resonant under full load, short the secondary out (when the transformer is off obviously) and measure the inductance on the primary. This is the combined leakage inductance and magnetising inductance in parallel.
Use this inductance and the formula f = 1/(2pi*sqrt(LC)) (you'll need to rearrange) to calculate the required capacitance. This is only an approximation, as it does not take into account the increased resistance on the secondary you would see under real load.
Registered Member #61406
Joined: Thu Jan 05 2017, 11:31PM
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Posts: 268
I would like to learn about PFC, I just assumed that it is parrellel resonance. After read wiki I assume it's any capacitor that can handle kvar. It also said you can overdo it. would it add much for a three phase genny, going through the a bridge recifter then ripple capacitor to a mppt solar grid inverter
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A generator with a resonance capacitor
