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This type of transformer using Z-type wiring (or zigzag wiring), the difference between ordinary transformers is that each phase of the coil is divided into two groups were reverse wound in the phase on the magnetic column, so that the advantage of the connection is the zero-sequence flux can be circulated along the magnetic column, while the zero-sequence flux of the ordinary transformer is circulated along the leakage magnetic circuit, so the Z-type grounding transformer's zero-sequence impedance is very small (10Q or so), and the The zero sequence impedance of Z-type grounding transformer is very small (about 10Q), while that of ordinary transformer is much larger. According to the regulations, with ordinary transformer with arc-canceling coil, its capacity shall not exceed 20% of the capacity of the transformer. z-type transformer can be 90% to 100% capacity of the arc-canceling coil, grounding transformer in addition to arc-canceling coil, can also take the secondary load, can replace the station variable, thus saving investment costs.