Important tests on Transformers Tamil 

Thanks

Thanks

Agreed for safety purpose

@@electricalvathiyar1753 earthed in other end not for Saftey else values will come in Mega ohms instead as Giga ohms..if you have doubt you can trail IR values with & without opposite end earthed.

It will be measured with Transformer ohm meter. By testing with multimeter you will get continuity (only beep) in secondary LV sides and a small ohm value on primary HV side but no beep.

megger.com/10-a-transformer-ohmmeter-mto210 The Transformer Ohmmeter is extremely useful when testing the windings and contact resistance of tap-changers with “make-before-break” contacts and voltage regulators. This action will check for pitted or misaligned contacts as the instrument will give an indication if either condition occurs.

Thanks sir.can you upload one video about how to check transformer winding resistance test

Ok

Star connectionla neutral common point. Phase to phasem kudukkalm.

@@electricalvathiyar1753 nandri sir I also have another doubt earth value withgrid yeavalavu irukkanum sir without grid yeavalavu irukkanum sir withgrid and without grid details sollunga sir

Less than 1 Ohm

For 11 kv transformer, cable, VCB, OCB We have to give only 5000 V DC is enough. For LT 500 V DC is enough to find the IR Value