As of my last knowledge update in September 2021, the term "transformer zero-phase sequence voltage" doesn't appear to be a widely recognized or commonly used concept in the field of electrical engineering or power systems. However, I can provide some information on related concepts that might be relevant.
Zero-Sequence Voltage: In power systems, zero-sequence voltage refers to the sum of the three-phase voltages at a common reference point. It represents a symmetrical fault condition where all three phases experience the same magnitude and phase shift. Zero-sequence voltages are important in analyzing unbalanced fault conditions, grounding systems, and the behavior of transformers and other equipment during faults.
Transformer Phasor Diagram: When analyzing transformers, phasor diagrams are commonly used to represent the relationship between primary and secondary voltages and currents. These diagrams help visualize the phase shifts and magnitudes of these quantities. It's possible that "transformer zero-phase sequence voltage" could be referring to a specific phasor diagram representation of the zero-sequence voltage in a transformer.
Transformer Connections and Sequences: Transformers can be connected in different ways, such as delta (Δ) or wye (Y) configurations. Each configuration affects the way voltages and currents are transformed between primary and secondary sides. The concept of positive-sequence, negative-sequence, and zero-sequence components comes into play when analyzing unbalanced conditions in power systems.
Sequence Networks: Power system analysis often involves breaking down the system into positive-sequence, negative-sequence, and zero-sequence components. This is particularly important when studying faults and disturbances. Sequence networks help engineers model system behavior under various conditions.
It's possible that the term "transformer zero-phase sequence voltage" could be a specific term coined for a certain research or application, or it might have emerged after my last update. If this term has gained significance after September 2021, I recommend consulting more recent literature or resources in the field of power systems or electrical engineering for a precise understanding.