Constant magnetic flux voltage regulation structure of ultra-high voltage autotransformer

Abstract

A constant magnetic flux voltage regulating structure of ultrahigh voltage self-coupling power transformer, comprising a main transformer body and a voltage regulating transformer body, the main transformer body comprising a series winding (HV), a common winding (MV), an excitation voltage regulating winding (JTV) and a third winding (LV) sleeved on the same iron core, the voltage regulating transformer body comprising a voltage regulating winding (TV) and an excitation winding (JV) sleeved on the same iron core; the series winding is in serial connection with the voltage regulating winding, and is subsequently in serial connection with the common winding; the excitation voltage regulating winding is in parallel connection with the excitation winding; the excitation voltage regulating winding is provided with a voltage regulating switch (K). The self-coupling transformer can connect two ultrahigh power grids, and by utilizing a constant magnetic flux voltage regulating method does not cause a third winding voltage fluctuation and iron over-excitation, reduces the level of insulation of a voltage regulating winding, and reduces cost and difficulty in manufacturing a voltage regulating switch.

Description

technical field [0001] The invention relates to the technical field of autotransformers, in particular to a constant magnetic flux voltage regulating structure of an ultra-high voltage autotransformer. Background technique [0002] Ultra-high voltage autotransformers are often used as connection transformers between two ultra-high voltage transmission systems. If the power grids connected to them are all ultra-high voltage systems, the series windings and common windings of the autotransformer are all ultra-high voltage voltages. grade. [0003] If the ultra-high voltage autotransformer adopts a voltage regulation structure, it generally adopts public winding line end voltage regulation or neutral point voltage regulation. The public winding line end voltage regulation is constant flux voltage regulation, and the neutral point voltage regulation is variable flux voltage regulation. Voltage regulation; in view of the fact that the neutral point voltage regulation method will...

AI Technical Summary

Problems solved by technology

The higher the insulation level of the common winding end, the more difficult and expensive it is to manufacture the tap changer. If the insulation level of the common winding side exceeds the manufacturing level of the existing switch, the traditional line end voltage regulation structure can no longer be used.

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