The number of vector groups in transformers depends on the winding configurations (delta, star, or zigzag) and the phase displacement between primary and secondary windings.
How many vector group in transformer
According to the IEC 60076-1 standard, there are 12 standard vector groups commonly used, categorized based on the phase displacement angle.
Here are the common vector groups:
1. Delta-Delta (Dy):
- D-D-0: No phase displacement.
- D-D-6: 180° phase displacement.
2. Delta-Star (Dy):
- D-Y-1: +30° displacement.
- D-Y-5: -150° displacement.
- D-Y-11: -30° displacement.
3. Star-Delta (Yd):
- Y-D-1: +30° displacement.
- Y-D-5: -150° displacement.
- Y-D-11: -30° displacement.
4. Star-Star (Yy):
- Y-Y-0: No phase displacement.
- Y-Y-6: 180° phase displacement.
5. Zigzag-Star (Zy):
- Variants similar to star groupings with specific impedance benefits.
How to Select Transformer Vector Group
Types of Transformer Vector Groups
There are several common vector groups. Here are a few:
- Dyn11: Common in distribution transformers
- Yyn0: Used for grounding purposes
- Dy5: Often used in industrial applications
Key Points: vector group in transformer
- Phase displacement is denoted in clock hour positions (e.g., D-Y-11 means 30° lag, resembling the hour hand at 11 o’clock).
- Custom vector groups can exist but are rare and tailored for specific applications.
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