A tubular equipotential electrode for a converter valve

Abstract

A tubular equipotential electrode for converter valve is composed of a circular tube with threads at both ends of outer wall, an annular groove on the end face of said circular tube, an O-shaped sealing ring in said annular groove, and an equipotential electrode connecting plate fixed on outer wall of said circular tube. The equipotential electrode is arranged at both ends of the transverse waterpipe of the valve section of the converter valve and arranged along the axial direction of the water pipe diameter. The utility model has the advantages of simple structure, high reliability, large contact area with cooling medium and obvious anti-electrolytic corrosion effect. The equipotential electrode is arranged along the axial direction of the water pipe and parallel to the flow of water andcurrent, which reduces the leakage point and the current density on the electrode surface, and effectively solves the corrosion and fouling problems of the equipotential electrode. At the same time,the sealing ring does not contact with the cooling medium, which effectively prevents the sealing ring from corrosion and improves the sealing reliability of the waterway system.

Description

technical field [0001] The invention relates to the technical field of direct current transmission, in particular to a tubular equipotential electrode for a converter valve. Background technique [0002] With the continuous development of high-voltage direct current transmission technology in my country, the number of direct current transmission projects continues to increase. The converter valve is the core equipment of the DC transmission system, and the operation of the internal cooling system directly affects the safe and stable operation of the converter valve. Therefore, it is very important to ensure the reliable and efficient operation of the cooling system. [0003] Converter valves usually use deionized water as the heat transfer medium. There is a potential difference between the water-cooling pipes inside the valve tower. The cooling water has a certain conductivity, which is generally maintained at 0.1-0.5μS / cm, so there will be a certain leakage current. This...

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Problems solved by technology

[0004] At present, the common equipotential electrode structure is complicated, and the reliability of multi-channel sealing rings is poor; it is necessary to punch holes in the water pipe, which increases the joints and leakage points of the waterway; for example: the Chinese patent with the publication number of CN 105118825 A provides an equipotential electrode , the installation direction of the equipotential needle in this equipotential electrode assembly is perpendicular to the direction of water flow, the surface current density is high, it is easy to corrode and scale, and the life cycle is short

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