Self-coupling power transformer in 330kV three-phase and three-winding neutral point on-load voltage regulation mode

Abstract

The invention relates to a self-coupling power transformer in a 330kV three-phase and three-winding neutral point on-load voltage regulation mode, and belongs to the technical field of manufacturing of transformers. According to the technical scheme, the self-coupling power transformer comprises a three-phase and five-column iron core, wherein the iron core (12) is sleeved with a low-voltage winding (13), a voltage adjusting winding (14), a public winding (15) and a series-connection winding (16) sequentially in a concentric mode, and an on-load tap-switch (11) is arranged directly at the tail end of the public winding. The mode of neutral point on-load voltage regulation is adopted, the insulation level of the voltage adjusting winding and the insulation level of the on-load tap-switch are equivalent to that of a neutral point, and the current flowing through the on-load tap-switch is the current of the public winding. The voltage adjusting winding is tightly adjacent to the low-voltage winding, the overall structure of the transformer is compact, and the overall performance requirement of the transformer is met. The self-coupling power transformer is simple in structure, low in overall manufacturing cost and wide in adjusting range of voltage, has the advantages of small size, light weight, low losses and the like, and can be widely applied to power systems with frequent voltage fluctuation.

Description

technical field [0001] The invention relates to a 330kV three-phase three-winding self-coupling power transformer with on-load voltage regulation at a neutral point, belonging to the technical field of transformer manufacturing. Background technique [0002] Autotransformers are widely used in power systems for their advantages of less material consumption, low cost, high efficiency, and easy transportation. Autotransformers often adopt the method of voltage regulation at the end of the series winding and voltage regulation at the medium-voltage side line. When the voltage regulation at the end of the series winding is adopted, the insulation level and working voltage of the voltage regulating winding and the on-load switch are high, and the spatial arrangement of the voltage regulating winding , the connection mode and the mutual position of other windings must be considered overall; when the medium voltage side line end voltage regulation method is adopted, the current flo...

AI Technical Summary

Problems solved by technology

The above two voltage regulation methods will make the structure of the transformer complex, difficult in the manufacturing process, the transformer is bulky, and the overall cost is high.

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