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.