Generator transformer and power generation system

Abstract

The invention provides a generator transformer and a power generation system, in particular to a three-phase split type transformer. According to the invention, a coil structure meets the technical requirement of a unit for secondary reheating. The generator transformer is formed by connecting three single-phase transformers, wherein an iron core of each single-phase transformer is of a four-column structure, namely two main column iron cores and two side column iron cores; each main column iron core is provided with a high-voltage coil and a low-voltage coil, and the capacities of the two columns are 300 MVA and 240 MVA respectively; the two high-voltage coils are both of an inner shielding continuous structure, the head ends of the two high-voltage coils are hand in hand at the middle portions of the coils and are then parallelly led out, the tail ends of the two high-voltage coils are hand in hand at the upper and lower portions of the coils and are then parallelly led out, and voltage-regulating branching line segments are arranged at the middle portions of the high-voltage coils; and the two low-voltage coils are of a double-layer spiral structure and are respectively and independently led out. Under the same generator set condition, the transformer of the invention is configured according to a conventional transformer and has a huge cost advantage and a smaller occupied area.

Description

technical field [0001] The invention belongs to the technical field of power transformers, and in particular relates to a generator transformer applied to the arrangement of ultra-supercritical double reheating high and low units and a power generation system using the transformer. Background technique [0002] With the continuous development of my country's electric power industry, especially under the tremendous pressure of continuous improvement of the atmospheric environment and the continuous reduction of CO2 emissions in response to climate change, the demand for thermal power generation equipment is towards larger capacity, higher parameters, higher efficiency, lower consumption, and lower pollution. And develop in a more intelligent direction. The development of ultra-supercritical technology from 600°C to 700°C and from primary reheating to secondary reheating is an inevitable trend, and the demand for larger-capacity generator transformers is also increasing. [...

AI Technical Summary

Problems solved by technology

At present, the maximum three-phase capacity of a 500KV voltage level transformer is 1230MVA, which is difficult to meet the needs of a higher capacity such as a 1350MW turbogenerator set. The development of super-large capacity transformers has become an urgent need for domestic and foreign transformer manufacturers.

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