Tap Changers Transformers in parallel

AI Thread Summary
Switching tap changers from auto to manual while harmonics are filtered can disrupt the balance in a parallel transformer setup supplying variable speed drives (VSDs). The tap changers help manage RMS voltage and prevent circulating currents, which is crucial for maintaining system stability. When harmonics are filtered out, the transformers' vector groups must be correctly configured to handle neutral current harmonics effectively. Manual operation may lead to unfiltered harmonics affecting performance if not managed properly. Proper selection of transformer configurations and static filters is essential for optimal operation in such scenarios.
luc4van
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If tap changers are on auto and the harmonics are filtered out, what would happen if the tap changers are switched to manual i.e. harmonics/noise
 
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luc4van said:
If tap changers are on auto and the harmonics are filtered out

Tap changer as filter of harmonics!? how
 
Sorry should have explained, 3 transformers in parallel supplying power to 4 VSD's, if the harmonics/noise have been filtered out by adding capacitors and or tuned out at the VSD's and this was done with the tap changers on auto, what will happen if the tap changers are switch to manual? the question is really about the neutral Earth harmonics
 
tap changer of which equipment? transformers,VSD or capacitor as harmonic filter ?
 
Transformers
 
Transformers on load tap changer and relevant AVR systems is considered for RMS voltage control and preventing of circular current between parallel transformer with using of voltage and current output of transformer as feedback signals, therefore voltage or current harmonics cannot influence on its loop control. For control of neutral current harmonic you must choose suitable transformer vector groups (Dy5,7) in addition of static filters.


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