Understanding the Open Circuit Test in Single Phase Auto Transformers

  • Thread starter Thread starter noor.lalu
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Discussion Overview

The discussion revolves around the open circuit test in single phase auto transformers, specifically addressing why the test is conducted on the low voltage side rather than the high voltage side. The scope includes technical explanations and conceptual clarifications related to transformer testing.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions why the open circuit test is performed on the low voltage side of a single phase auto transformer.
  • Another participant explains that the open circuit test aims to determine the characteristics of the magnetizing circuit, suggesting that results should be consistent regardless of which winding is used, and mentions safety and convenience as reasons for using the low voltage side.
  • A different participant expresses confusion and requests a clearer explanation of the reasoning.
  • It is noted that the open circuit test is performed from the low voltage side in all transformers to supply full voltage safely, as the full voltage on the low voltage side is lower than that on the high voltage side.

Areas of Agreement / Disagreement

Participants express differing levels of understanding regarding the rationale behind the choice of the low voltage side for the open circuit test, indicating that the discussion remains somewhat unresolved with varying perspectives on clarity and explanation.

Contextual Notes

Some assumptions about safety and convenience are mentioned, but the discussion does not fully explore the implications or definitions of these terms.

noor.lalu
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pleasezz give answer to my question

why in single phase auto transformer experiment in open circuit test all sources are connected to low voltage side why not to high voltage side?
 
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The open circuit test is about determining the characteristics of the magnetizing circuit (core common to both windings) so the results should be the same when referred to either winding. Presumably the low voltage winding is chosen for safety and convenience.
 


no it not understandaable please give clear explanation
 


Not just auto, but with every transformer, open circuit test is done from L.V. side because in open circuit test you have to supply full Voltage (to study magnetic reactances). Since Full voltage in L.V. side is lower than H.V. side its safer to work with L.V.
 

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