Constant-magnetic-flux voltage regulating structure for ultrahigh-voltage self coupling electric transformer

Abstract

The invention relates to the technical field of a self coupling transformer, in particular to a constant-magnetic-flux voltage regulating structure for an ultrahigh-voltage self coupling electric transformer. The constant-magnetic-flux voltage regulating structure comprises a main transformer body and a voltage regulating transformer body, wherein the main transformer body comprises a serial connection winding, a public winding and a third winding, the voltage regulating transformer body comprises a voltage regulating winding and an exciting winding, the voltage regulating winding and the exciting winding sleeve the same iron core, the serial connection winding and the voltage regulating winding are connected in series and are then connected in series with the public winding, the main transformer device body is also provided with an exciting voltage regulating winding, the exciting voltage regulating winding, the serial connection winding and the public winding sleeve the same iron core, the exciting voltage regulating winding and the exciting winding are connected in parallel, and the exciting voltage regulating winding is provided with a voltage regulating switch. The self coupling transformer adopting the constant-magnetic-flux voltage regulating structure provided by the invention can realize the connection between two ultrahigh-voltage electric networks; a constant-magnetic-flux voltage regulating mode is adopted, so the third winding voltage fluctuation and the iron core overexcitation cannot be caused; meanwhile, the insulation level of the voltage regulating winding is reduced, and the manufacturing difficulty and the cost of a tap switch are reduced.

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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