66kv side structure of compact 500kv main transformer

Abstract

A 66kv side structure of a compact 500kv main transformer comprises an A, B, C three-phase transformer. The three-phase transformer is connected to a main loop through a triangle bus. The main loop is connected with a 66kv bus and a switch branch loop. The 66kv bus and the switch branch loop are connected with each branch loop. The branch loop comprises: a capacitance branch loop and a reactance branch loop. The capacitance branch loop comprises: a shunt capacitor group and a series reactor connected with the shunt capacitor group. The reactance branch loop comprises a three-phase reactor. The triangle bus uses a gas insulation bus to complete triangle winding. In the capacitance branch loop, A, B, C three phases are superposed to place in the each shunt capacitor group. In the reactance branch loop, the reactor is a superposition-type dry parallel hollow reactor or a magnetic-shielding parallel reactor.

Description

technical field [0001] The invention relates to a compact 500kv main transformer 66kv side structure. Background technique [0002] my country's 500kv substation adopts 550kv / 220kv / 66kv three-level voltage, and the low-voltage side is connected to reactive power compensation device and station power, which is an important part of the substation. [0003] At present, in the design of substations, the design optimization of high voltage levels is generally emphasized. By optimizing the wiring type, adopting compact equipment, and reducing the size of power distribution devices, the reliability of the substation is improved, the floor area is reduced, and the project cost is reduced. However, the original ideas and models are still continued for the low-voltage side of the main transformer, and conventional equipment and conventional power distribution devices are used. There has been no obvious development and change over the years, and it occupies a large area. In the substa...

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Problems solved by technology

[0014] The shortcomings of conventional dry resistance are also obvious. Its size is relatively large, and it must meet the magnetic shielding distance between them. It is generally arranged in a "shaped" or "shaped" and occupies a large area, such as image 3 , Figure 4 , Figure 5 and Image 6 As shown in the figure, the dotted line box of the reactor indicates the magnetic shielding distance

[0015] Conventional capacitor complete sets are arranged in separate phases in substations, resulting in a large footprint, such as Figure 7 , Figure 8 shown

In the figure, each phase reactor is installed on a tower, and each phase reactor is divided into two sections. This arrangement occupies a large amount of land area

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