The transformer's vector group is a combination of letters and numbers that represents the winding configuration of the transformer. These letters and numbers indicate the number of primary and secondary winding phases, the winding connections, and the phase displacement between the primary and secondary windings. The vector group is typically expressed in letters, such as Yyn0, Dyn11, or Z1y0.
Transformer Winding configurations:
D: Delta connection
Y: Wye(star,Y)connection
Z: Zigzag(z) connecttion.
N: Neutral point available
Phase Displacement
Represented by number(0 to 11), each indicating a 30-degree phase shift, between primary and secondary windings.
One commonly used instrument for testing transformers is the transformer turn ratio tester. This instrument is used to determine the turns ratio of a transformer, which is the ratio of the number of turns in the primary winding to the number of turns in the secondary winding. This ratio is critical in ensuring that the transformer provides the correct voltage output under different load conditions.
The IEC 60076-1 international standard defines vector group notation, testing procedures, and allowable phase displacements for power transformers worldwide. Wuhan Huayi electric power technology is making the transformer turn ratio tester(TTR meter), it can test transformer Vector group automatically.
The transformer vector group is critical in ensuring the proper operation and protection of transformers in power systems. Understanding the vector group is essential for specifying, testing, and operating power transformers efficiently and safely. The transformer turn ratio tester is a valuable tool in determining the turn ratio of transformers, which is crucial in ensuring their proper operation.