500kV single-phase self-coupling on-load voltage regulating transformer with built-in compensation transformer

Abstract

The invention relates to a 500kV single-phase self-coupling on-load voltage regulating transformer with a built-in compensation transformer, and belongs to the technical field of transformers. According to the technical scheme, the compensation transformer is arranged in a 500kV single-phase autotransformer oil tank, and neutral point side on-load voltage regulation is achieved through an on-loadswitch; the single-phase autotransformer and the compensation transformer are placed in the same oil tank, and the compensation transformer is installed at the end of an iron core of the single-phaseautotransformer through a fixing device and connected into a whole through a lead. The transformer has the advantages that the voltage classes of the voltage regulating winding and the on-load switchare low, a tapping lead is simple and compact in structure, the two transformers can be hoisted and transported at the same time, the cost is saved, and the electrical performance is improved.

Description

technical field [0001] The invention relates to a 500kV single-phase auto-coupling on-load voltage regulating transformer with a built-in compensation transformer, belonging to the technical field of transformers. Background technique [0002] The 500kV single-phase autotransformer adopts on-load power regulation on the neutral point side, and can use relatively economical low-voltage insulation level on-load tap-changers, voltage regulating windings and voltage regulating winding leads. However, if figure 1 It is the schematic diagram of the neutral point voltage regulating transformer. The magnetic flux of this kind of transformer changes continuously during the voltage regulation process, and the voltage fluctuation of the third winding (low voltage winding) appears. This voltage drift must have requirements on the load. In the third Windings cause great difficulties when connecting loads (reactors, capacitors) that impose certain voltage requirements. Contents of the ...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a 500kV single-phase auto-coupling on-load tap-changing transformer with a built-in compensation transformer, which solves the problem of voltage drift of the third winding, the voltage level of the voltage-regulating winding of the transformer and the on-load switch is low, and the structure of the tap leads is simple. The structure is compact, and two transformers can be hoisted and transported at the same time, which not only saves the cost but also improves the electrical performance, and solves the above-mentioned technical problems existing in the existing technology

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