Q. What is vector group?
A. In three phase transformers we can connect the winding in different fashion.Based on the wingding connection, we will determine vector group.generally vector group is indicated on the Name Plate of transformer by the manufacturer.The vector group teaches us about the phase difference between the primary and secondary sides.The Determination of vector group of transformers is very important before connecting two or more transformers in parallel.
If two transformers of different vector groups are connected in parallel then phase difference exist between the secondary of the transformers and large circulating current flows between the two transformers.
Q.What is the need of doing this test?
A. We just confirming the the vector group given on name plate details is correct or not.
PROCEDURE OF TESTING...
1. Give three phase supply to primary of the transformer .
2. Short the primary and secondary R phase externally.
3. Apply three phase voltage to the primary of the transformer (415 volts) .
4. Measure the voltages that we need .
5. Check the equations by using values.
Remove all electrical connections while doing test for better results.............
PROCEDURE OF TESTING...
1. Give three phase supply to primary of the transformer .
2. Short the primary and secondary R phase externally.
3. Apply three phase voltage to the primary of the transformer (415 volts) .
4. Measure the voltages that we need .
5. Check the equations by using values.
Remove all electrical connections while doing test for better results.............
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