4. Transformer Winding Relationship Vector Diagrams also referred to as Vector Groups. Vector groups describe the phase displacement and winding configuration between primary and secondary sides of a transformer. • They follow IEC 60076-1 notation (e.g., Dyn11, Yyn0, Yd1). • Common Winding Configurations: Common Winding Config Symbol Config Description Y Wye (Star) Neutral available D Delta
No neutral, closed loop Used for grounding or harmonic suppression
Z
Zigzag
• Clock Notation (Phase Shift)
o Indicates phase displacement between HV and LV windings o Clock positions: 0 = 0° shift 1 = 30° lead (voltage leads current)
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