Ultrasonic-based voltage-sharing electrode handheld descaling device and descaling method

Abstract

The invention requests to protect a handheld descaling device for performing valve cold water loop voltage-sharing electrode based on an ultrasonic technology, and belongs to the technical field of ultrasonic nondestructive removal. The voltage-sharing electrode descaling device mainly comprises a current injection module, a scale layer thickness detection module, a high-frequency electric signalgeneration module, a power amplification module and a transducer signal module. The thickness detection module measures the potential of the voltage-sharing electrode by applying current excitation, and determines the scaling thickness of the voltage-sharing electrode according to different measurement impedances; the frequency of a signal sent by the high-frequency electric signal generation module, the amplification factor of the power amplification module and the ultrasonic action time are intelligently optimized through the measured thickness information, and the optimal descaling effect is achieved; and finally, ultrasonic waves are output through a transducer module, and a scale layer on the surface of the electrode is removed through a cavitation effect. In the past, the voltage-sharing electrode needs to be dismounted by sampling during converter valve maintenance.

Description

technical field [0001] The invention belongs to a cooling system for equipment in a high-voltage direct current transmission system, in particular to a hand-held descaling device and a descaling method based on ultrasonic waves Background technique [0002] In the UHV power transmission system, the converter valve is not only the core equipment of the system, but also the weak link of the system. Converter valves will generate a lot of heat during system operation, and its overheating is an important cause of converter valve failures. More than 25% of converter valve failures are caused by valve cooling systems. The cooling system of the converter valve is referred to as the valve cooling system. When the valve cooling system is working, the cooling water takes away heat to ensure that the temperature of the converter valve remains normal. The metal components in the converter valve have different potentials and are in direct contact with the cooling water. If the potential...

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Problems solved by technology

Scaling and detachment of electrodes will cause problems such as blockage of cooling water pipes, resulting in shutdown of the converter station due to failure of the valve cooling system

[0003] At present, the domestic method to solve the fouling of voltage equalizing electrodes is regular inspection and cleaning, but the method adopted is to remove the scales by the staff using mechanical means after dismantling the electrodes. Because the process of disassembling the equalizing electrodes is cumbersome, and the equalizing electrodes are repeatedly disassembled It is very easy to loosen the sealing gasket. When cleaning the voltage equalizing electrode, it is often checked by sampling. If the scale of the sample is not obvious, all electrodes will not be cleaned, which also causes serious safety hazards.

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