As of my last knowledge update in September 2021, I am not aware of a specific concept called a "transformer zero-sequence voltage grounding reactor." However, I can provide you with information about transformers, zero-sequence voltage, grounding reactors, and their potential relevance.
Transformer: A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction. It typically consists of two or more coils of wire (windings) that are used to transfer electrical energy by varying the magnetic field.
Zero-Sequence Voltage: In power systems, voltages and currents are often categorized into three sequences: positive-sequence, negative-sequence, and zero-sequence. Zero-sequence voltage refers to the component of voltage that is equal in magnitude and phase for all three phases in a three-phase system. It is typically associated with unbalanced or earth-fault conditions.
Grounding Reactor: A grounding reactor, also known as an earthing reactor or neutral grounding reactor, is a device used in power systems to limit the flow of zero-sequence currents during ground faults. Grounding reactors are connected in series with the neutral point of transformers or generators. They are designed to provide impedance to the zero-sequence currents, which helps to limit fault currents and protect equipment from damage during ground faults.
Based on these definitions, it's possible that the term "transformer zero-sequence voltage grounding reactor" could refer to a grounding reactor specifically designed to address the zero-sequence voltage and associated currents that can occur in a transformer during ground faults. This would be a measure to enhance the safety and stability of power systems.
It's worth noting that power system technology and terminology can evolve over time, and new concepts or terminologies may emerge beyond my last knowledge update. If this term has emerged after September 2021, I recommend consulting more recent sources or experts in the field for accurate and up-to-date information.