A design method of three-winding transformer suitable for 35kv distribution construction

Abstract

The invention provides a three-winding transformer design method suitable for 35kV distribution construction. The method comprises the steps: (1) according to the layout scheme of a 35kV distribution transformer substation, determining 0.4kV side capacity; (2) setting the capacity of a transformer, and designing the body of the three-winding transformer; (3) carrying out material selection for the three-winding transformer; (4) calculating the operation loss of the three-winding transformer; (5) carrying out economic analysis on the power distribution station. The three-winding transformer design method suitable for 35kV distribution construction, provided by the invention, aims at the current distribution construction of 35kV transformer substations in remote and border areas, a main transformer of each 35kV transformer substation mainly adopts a 35 / 10 / 0.4kV three-winding transformer, the 0.4kV side is configured with proper capacity to be used as a power supply for loads of the substation and surrounding loads of the transformer substation, the economical efficiency is analyzed in the two aspects of cost saving and loss reduction, meanwhile, an on-load tap changer is equipped after selectivity is considered, and the economical operation of the transformer is realized.

Description

technical field [0001] The invention belongs to the field of power distribution, and in particular relates to a design method for a three-winding transformer suitable for 35kV power distribution construction. Background technique [0002] Due to the large coverage of rural areas in my country, especially the remote rural areas in the central and western regions, mountainous areas or mid-mountainous areas, the land is sparsely populated, the load is small and scattered, and the distribution of 35kV power supply is insufficient, which seriously affects the normal production and life of rural residents. The construction of 35kV power distribution combined with the actual situation in remote areas, adopts differentiated design, which effectively alleviates the problems of rural power grid funding shortage, difficulty in adding points, and long construction period, optimizes the rural grid network structure and power supply mode, and improves the quality of power supply voltage. ...

AI Technical Summary

Problems solved by technology

Due to the obvious seasonality and timeliness of residential electricity load and station load in remote areas, while the station transformer has a large loss and does not have a voltage regulation function, which is not conducive to the economic operation of the substation

The substation power supply system includes the primary system and the secondary system protection equipment is relatively complex, has high requirements for reliability, and is easy to be ignored, directly affecting the safe operation of the substation

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