Method for improving operation reliability of converter valve towers through converter station

Abstract

The invention provides a method for improving the operation reliability of converter valve towers through a converter station. According to the method, a connection terminal in the middle of an A-phase converter valve tower (12A) is electrically connected with an upper valve side bushing (2) of an A-phase converter transformer (1A) and a lower valve side bushing (3) of a B-phase converter transformer (1B) separately; the connection terminal in the middle of a B-phase converter valve tower (12B) is electrically connected with the upper valve side bushing (2) of the B-phase converter transformer(1B) and the lower valve side bushing (3) of a C-phase converter transformer (1C) separately; the connection terminal in the middle of a C-phase converter valve tower (12C) is electrically connectedwith the lower valve side bushing (3) of the A-phase converter transformer (1A) and the upper valve side bushing (2) of the C-phase converter transformer (1C); and the connection terminals at the bottoms of the converter valve towers (12) are electrically connected. According to the method, the trigger order can be ensured without changing a logic control time sequence in a valve control protection system for the converter valve towers, and the operation safety and reliability of the converter valve towers are improved.

Description

technical field [0001] The invention relates to the field of connection design between a converter transformer and a converter valve tower, in particular to a method for improving the operation reliability of a converter valve tower in a converter station. Background technique [0002] In the ±800kV UHV converter station, two sets of twelve-pulse converter valve towers are usually connected in series, and each set of twelve-pulse valve sets is arranged in a valve hall. A, B, and C three-phase converter transformers (abbreviated as "converter transformers", the same below) have valve-side bushings directly inserted into the valve hall, and are respectively connected to A, B, C The connection terminal of the three-phase converter valve tower. Although this one-to-one phase sequence wiring method is simple to operate, for the valve control protection system of the converter valve tower, in order to ensure the trigger sequence of the converter valve tower, it is necessary to ch...

AI Technical Summary

Problems solved by technology

Obviously, the wiring radian of the soft wire connected by conventional suspension insulators cannot meet the seismic requirements of converter valves in areas with high seismic intensity

At the same time, since the body weight of the 800kV converter valve tower is 4-5t, if the conventional suspension insulator is used to connect the flexible wire, the seismic displacement of the converter valve tower will be limited due to the margin of the flexible wire connected to the suspension insulator Therefore, the seismic stress of the converter valve tower will directly pull the valve-side bushing of the converter through the connecting flexible wire, which may cause damage to the terminal of the valve-side bushing of the converter.

[0004] In addition, in the conventional UHV converter substation converter valve side outlet structure design scheme, the A, B, and C three-phase converters are all connected to the bottom insulator of the suspension pipe bus through six split soft wires, and the six The lead wires of the split flexible wires are long, the electrical distance between the down-conductor of the side-phase short-circuit of the suspension pipe mother and the upper-lead wire of the side phase to the outlet line of the converter valve tower is not easy to control, and the swing of the suspension pipe mother (especially Earthquake conditions) may cause the adjacent six-split flexible wires to collide with each other, thus affecting the safety and reliability of the connection and outgoing wires at the converter valve side

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