Method for improving troubleshooting efficiency of shear pin system of water turbine

Abstract

The invention discloses a method for improving the troubleshooting efficiency of a shear pin system of a water turbine and belongs to the technical field of maintenance of water turbine equipment in power plants. According to the method, in order to overcome defects existing in design and installation of an original system, segmenting of the whole system is determined so that all shear pins can be controlled independently, it is that a hand control valve is additionally installed on an inlet of an air supply branch pipe of each shear pin, an air inflation test is carried out on the air supply branch pipes of all the shear pins independently, when the pressure is kept for 30min, the inflated air supply branch pipes and connectors of the shear pins are brushed with soap water if the pressure is found to decrease, and a fault point is judged out according to foaming conditions. The method overcomes the defects that for maintenance personnel, because the number of the connectors of the shear pin air supply system is too large, the troubleshooting range is wide, an air leakage point is different to find and determine, the troubleshooting work hours are long, working efficiency is low, and the unit cannot recover to be normal timely. After the improvement, the troubleshooting range is shrunken, the technology is easy and convenient to carry out, work hours are shortened, the defects are eliminated timely, and safe operation of the master equipment is not affected after the implementation.

Description

technical field [0001] The invention belongs to the technical scope of maintenance of hydraulic turbine equipment in a power plant, and in particular relates to a method for improving the troubleshooting efficiency of a shear pin system of a hydraulic turbine. Background technique [0002] Beijing Mingling Energy Storage Power Plant is a power plant directly under State Grid Xinyuan Holdings Co., Ltd., with a single unit capacity of 200,000 kilowatts and a total of 4 units. There is a shear pin, and forms a signal monitoring system with the signal device and the gas supply system. The shearing pin is a safety protection device for the water guiding mechanism of the water turbine. According to the design principle of the shearing pin, when the guide vane is blocked by foreign objects and cannot rotate during the operation of the water guiding mechanism, the shearing pin is cut off, thereby completing the protection of the entire water guiding mechanism. However, the actual ...

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Problems solved by technology

[0004] (1) According to the judgment of pigment leakage, when a small amount of leakage occurs due to small cracks in the shearing pin, the fault point cannot be determined through pigment leakage

[0005] (2) Brush each joint with soapy water and judge according to the foaming situation. Because there are many joints and the scope of investigation is large, it is impossible to accurately determine the specific fault point in time, which greatly increases the working hours and reduces the work efficiency.

[0006] (3) Check the fault points one by one and dismantle them if necessary. The process is relatively more complicated and the working hours are relatively longer

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