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This vector group test is done to confirm whether the vector group provided in the name plate is correct or not and also to confirm that the winding has not been damaged during transport, installation and erection.

Taking a particular example, for Dyn11 transformer we have to apply 3~ 400v to the primary, with primary 'U' & secondary 'u' shorted....

then check the voltage across different terminals such as V-v, V-w, W-w, W-v

for Dyn11 configuration (V-v = V-w = W-w)less than W-v....

you can compare the results after drawing the vector diagram for the same......

the purpose of shorting the primary U & secondary u is to nullify the phase shift, to obtain a reference vector...

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Zigzag is the special kind of winding which has both delta and star connection.It has two coils, one coil is connected as a delta and another coil has a star point as Neutral and give to Earth through Neutral earthing resistor.

Procedure of vector group testing:

1. Ensure the system is isolated or not and remove the earthing from the System.

2. Make shot between HV R-Phase and LV R-phase of the Transformer.

3. Apply 3 phase supply to the HV of the Transformer.

4. Measure the combinations of voltages between HV and LV sides compared with the vector diagram.

5. Make sure the combinations are correct or not.

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13y ago
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Q: How can you test ZNyn11 Vector group transformer?
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