Understanding the Open Circuit Test in Single Phase Auto Transformers

[noor.lalu]

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?

 

[uart]

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.

 

[noor.lalu]

no it not understandaable please give clear explanation

 

[I_am_learning]

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.

 

[DeeNos]

In a single phase auto transformer experiment, the open circuit test is used to determine the no-load current and losses of the transformer. This test is performed by disconnecting the secondary winding and applying rated voltage to the primary winding. The reason for connecting all sources to the low voltage side is to ensure that the primary winding is not overloaded and to avoid any potential safety hazards.

If the sources were connected to the high voltage side, the primary winding would be subjected to the full rated voltage, which could lead to overheating and potential damage to the transformer. Additionally, the high voltage side may pose a safety risk to the experimenter, as it carries a higher voltage.

By connecting all sources to the low voltage side, the primary winding is only subjected to a fraction of the rated voltage, reducing the risk of damage and ensuring the safety of the experiment. This also allows for accurate measurement of the no-load current and losses of the transformer, as these values are typically lower on the low voltage side.

In summary, connecting all sources to the low voltage side in the open circuit test of a single phase auto transformer is a necessary precaution to ensure the safety of the experiment and obtain accurate results.