Tap Changers Transformers in parallel

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Discussion Overview

The discussion revolves around the operation of tap changers in transformers, specifically when switching from automatic to manual mode in the context of harmonic filtering. The scenario involves three transformers in parallel supplying power to variable speed drives (VSDs) and the implications for neutral Earth harmonics.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions the effects of switching tap changers from auto to manual when harmonics are filtered out, seeking clarity on the implications for system performance.
  • Another participant expresses confusion about how tap changers can act as filters for harmonics, indicating a need for further explanation.
  • A participant clarifies that the context involves three transformers in parallel supplying power to four VSDs, emphasizing that harmonics have been managed through capacitors and tuning at the VSDs while the tap changers were on auto.
  • There is a query regarding which equipment the tap changer refers to, highlighting the need for specificity in the discussion.
  • A participant identifies the equipment in question as transformers and discusses the role of on-load tap changers and automatic voltage regulation (AVR) systems in controlling RMS voltage and preventing circular currents between parallel transformers, suggesting that harmonics should not affect control loops.
  • It is proposed that suitable transformer vector groups (e.g., Dy5,7) should be chosen in conjunction with static filters to manage neutral current harmonics effectively.

Areas of Agreement / Disagreement

Participants express varying levels of understanding and clarity regarding the role of tap changers and harmonics, indicating that multiple competing views remain without a consensus on the implications of switching modes.

Contextual Notes

The discussion includes assumptions about the effectiveness of harmonic filtering and the specific configurations of transformers and VSDs, which may not be universally applicable. The relationship between tap changers and harmonic management remains unresolved.

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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