Extra-high voltage single-phase autotransformer

Abstract

An extra-high voltage single-phase autotransformer belongs to transformer technology field for resolving low-voltage fluctuate problem. The technical scheme is: the transformer consists of autotransformer body, voltage-regulating transformer and low pressure compensate transformer, the autotransformer body is made up of low-pressure winding, public windings and series winding, the voltage-regulating transformer is made up of exciter winding and pressure regulating windings, the low-voltage compensate transformer is made up of low-voltage exciter winding and compensated winding, connected relation of each windings is: pressure regulating windings, public windings and series winding connect input voltage after connecting in series, pressure regulating windings and two terminal of public windings connect output circuit, low-voltage exciter winding and pressure regulating windings are parallel connection, low-pressure winding connects with exciter winding in parallel firstly, secondly, connects with compensated winding in series, then connects compensation network. The present invention can satisfy demand of various users with simple structure, low cost, little low-voltage voltage fluctuation and high insulation reliability.

Description

technical field [0001] The invention relates to a single-phase autotransformer with a voltage up to 1000kV and belongs to the technical field of transformers. Background technique [0002] There are two voltage regulation methods used in traditional single-phase autotransformers, namely constant flux voltage regulation method and neutral point variable flux voltage regulation method. The voltage regulating winding adopting the constant magnetic flux voltage regulating method is arranged at the line end of the common winding, so the insulation level of the voltage regulating winding and the selected voltage regulating switch is at least the insulation level of the medium voltage winding, figure 1 It is the schematic diagram of constant magnetic flux voltage regulation wiring. This single-phase autotransformer has the following technical characteristics: [0003] 1. The magnetic flux density of the core and the voltage of the winding with a constant number of turns, such as t...

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Problems solved by technology

[0005] 3. The selected switching voltage level is high and the price is expensive

[0010] For UHV single-phase autotransformers, such as 1000kV autotransformers, the rated voltage of the medium-voltage side is 500kV. If the constant magnetic flux voltage regulation method is used, it is necessary to select a switch with a voltage exceeding 330kV, which is currently impossible. Even if such a switch can be manufactured, its price is unacceptable; if the neutral point variable flux voltage regulation method is adopted, because the low voltage voltage fluctuates greatly under each tap, sometimes it cannot meet customer requirements at all

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