Monitoring Method for Slight Leakage of Valve Cooling System Based on Temperature Compensation and Least Square Method

Abstract

A method for monitoring slight leakage of a valve cooling system based on temperature compensation and the least squares method, wherein the valve cooling system includes a main circulation pump, a main filter, a diverter valve, an expansion tank, and a cooling tower that are sequentially connected through pipelines and form a loop; The expansion water tank is connected to the main circulation pump, and a water level sensor is installed inside the expansion water tank; the advantage is that it effectively solves the problem of blank detection means for slight leakage of the cooling water in the valve cooling of the converter station, and is conducive to reducing unplanned power outages in the DC system time, improve the stability of the DC system, and have broad 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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