On-line monitoring system for scaling of voltage-sharing electrode of converter valve

Abstract

An on-line monitoring system for scaling of a voltage-sharing electrode of a converter valve comprises a voltage-sharing electrode monitoring terminal on a converter valve tower and a voltage-sharingelectrode monitoring host in a control room under the converter valve tower, and the terminal and the host are connected with data communication through an optical fiber or a wireless network. The voltage-sharing electrode monitoring terminal comprises a light transmitting unit, a light receiving unit, a received light signal processing unit and a received light data transmitting unit; the light transmitting unit transmits incident light to irradiate the voltage-sharing electrode; reflected light of the voltage-sharing electrode is received by the light receiving unit, after a received signalis processed by the received light signal processing unit, the received light data sending unit sends a processing result to the voltage-sharing electrode monitoring host in a wireless mode or throughan optical fiber, and the host carries out data storage and scaling and oxidation warning of the voltage-sharing electrode. By installing the voltage-sharing electrode monitoring terminal based on alight reflection principle on a valve cold water pipe, corrosion and scaling conditions of the voltage-sharing electrode of the converter valve can be monitored on line, and the maintenance problem ofthe voltage-sharing electrode is effectively solved.

Description

technical field [0001] The invention relates to the technical field of a converter valve cooling system, in particular to an on-line monitoring system for fouling of a converter valve equalizing electrode. Background technique [0002] In recent years, with the completion and operation of the converter valves of the HVDC project, the valve cooling water circuit responsible for the cooling of the converter valves has been put into use in large quantities. The cooling water circuit of the valve operates in a closed manner, adopts a series / parallel combination design, and connects components that require heat dissipation, such as different IGBT heat sinks and water-cooled resistors on the valve tower. These components are at different potentials, and the water circuit between metal parts with different potentials Electrolytic current may be generated, which may cause electrolytic corrosion to metal. Therefore, in order to ensure good insulation of the waterway and reduce the c...

AI Technical Summary

Problems solved by technology

[0003] With the long-term operation of the water cooling system, the voltage equalizing electrode will start to produce electrochemical corrosion and deposition from the surface, manifested as discoloration and scaling, which will reduce the effective working area of ​​the electrode, resulting in a decrease in the conductivity of the voltage equalizing electrode. Decreased effect

When the scaling of the voltage equalizing electrode is serious, there is also the problem that the scale peels off and enters the water circuit, blocking the cooling water pipe and causing equipment shutdown, which will affect the stability of the converter valve operation and cause certain economic losses.

[0004] Since the pressure equalizing electrode is installed on the water pipe of the valve tower, personnel cannot approach the inspection when the valve tower is running at high pressure, so the operation and maintenance of the equalizing electrode has always been to check the equalizing electrode on the tower when the converter valve is out of service. Corrosion and fouling, it is impossible to detect the status of the equalizing electrode in real time

As a result, the status of the voltage equalizing electrodes is unknown when the valve tower is running, and it can only be checked when the converter valve is out of service; This not only prolongs the downtime of the converter valve for operation and maintenance, but also poses certain safety hazards.

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