Slight leakage monitoring method for valve cooling system based on temperature compensation and least squares

Abstract

Disclosed is a slight leakage monitoring method for a valve cooling system based on temperature compensation and least squares. The valve cooling system comprises a main circulation pump, a main filter, a converter valve, an expansion water tank and a cooling tower which are sequentially connected through pipelines and form a loop; the expansion water tank is connected with the main circulation pump and internally provided with a water level sensor; the method has the advantages that the problem that there is no means of detecting slight leakage of cold water in a valve cooling system of a converter station is effectively solved, the method is beneficial to shortening the unplanned power outage time of a direct current system, the stability of the direct current system is improved, and themethod has high popularization and application value.

Description

technical field [0001] The invention relates to the technical field of maintenance of a valve cooling system of a power grid, in particular to a method for monitoring slight leakage of a valve cooling system based on temperature compensation and the least square method. Background technique [0002] Each pole of the DC transmission system needs to be equipped with a set of valve cooling system. The valve cooling system is an important auxiliary part of the high-voltage DC transmission system. within the normal range. Each set of valve cooling system can be divided into two parts, the inner cooling water system and the outer cooling water system. The inner cooling water system is a closed circulating water system, which consists of a main circulation pump, a main filter, an expansion tank, a cooling tower, and a large number of diverter valves. Its main function is to discharge the power consumption and heat generation of each component on the converter valve to the outside ...

AI Technical Summary

Problems solved by technology

It can be seen from this that the setting of relevant fixed values ​​is based on the assumption that there is a serious water leakage in the valve cooling system, and it is impossible to effectively detect the slight water leakage that will cause the water level of the expansion tank to drop after several hours

The cold water pipeline in the valve is long, especially when the water flows through the diverter valve, it is divided into many small pipelines, and there are many interfaces. During long-term operation, water leakage is easy to occur

According to the current operating data, minor water leakages account for the vast majority. If the leakage point is at the diverter valve, it may cause a short circuit of the diverter valve, which is very harmful to the equipment.

In addition, due to the high temperature of the diverter valve, small leaks are easily evaporated, making it difficult to find leaks

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