Double-joint connection structure between converter transformers and converter valves

Abstract

The invention provides a double-joint connection structure between converter transformers and converter valves. The double-joint connection structure comprises converter transformers and converter valves. Conductive connection is formed between each phase of converter transformer and an independent converter valve. A first rotating joint armour clamp, a first suspension insulator, a second rotating joint armour clamp and a second suspension insulator are arranged between at least one phase of converter transformer and the corresponding converter valve; the two opposite ends of the first suspension insulator are connected with a suspension rack and the first rotating joint armour clamp; and the two opposite ends of the second suspension insulator are connected with the suspension rack and the second rotating joint armour clamp. Conductive connection is formed between the at least one phase of converter transformer and the corresponding first rotating joint armour clamp, second rotatingjoint armour clamp, and converter valve successively. According to the invention, the relatively rotation type movable connection structure is formed between the converter transformers and the converter valves by the first rotating joint armour clamps and the second rotating joint armour clamps, so that the seismic displacement of the converter valve tower is reduced or even cancelled and thus theseismic performance is enhanced.

Description

technical field [0001] The invention relates to the field of connection structure design of a converter transformer and a converter valve, in particular to a double-joint connection structure between a converter transformer and a converter valve. Background technique [0002] The valve side bushing of the converter transformer (referred to as "converter", the same below) is directly inserted into the valve hall, and after the star connection is completed at the end of the post insulator on the valve side through 6 split soft wires in the valve hall, then through The telescopic pipe busbar is connected from the end of the valve-side post insulator to the terminal of the corresponding converter valve. For UHV converter stations in areas with conventional low seismic intensity, due to the small horizontal acceleration of the earthquake, the corresponding swing range of the converter valve under seismic conditions is relatively small. The seismic displacement between the termin...

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Problems solved by technology

[0003] However, for UHV converter stations located in areas with high seismic intensity, such as areas where the seismic intensity is not lower than 8 degrees, due to the high seismic intensity of the site, the displacement of the converter valve under seismic conditions is relatively large

For example, after actual simulation analysis and calculation, for an 800kV UHV converter station in a high-seismic intensity area, the seismic swing amplitude at the terminal of the high-end 800kV converter valve may reach 1.5m. earthquake resistance

In addition, since the body weight of the 800kV converter valve is 4-5t, if the conventional telescopic tube nut connection scheme is adopted, the seismic stress of the converter valve will cause the The terminal block and post insulator of the flow valve are damaged

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