An Online Fault Diagnosis Method for Proportional Servo Valve of Hydraulic Turbine Governor

Abstract

The invention discloses a method for diagnosing on-line faults of a proportional servo valve of a hydraulic turbine governor. The method comprises the following steps that electric current of an electromagnet coil of the proportional servo valve is collected, and judgment of the line breakage fault of a proportional servo valve control coil is conducted; feedback voltage of the proportional servovalve is collected, and judgment of the line breakage fault of proportional servo valve feedback is conducted; a proportional servo valve control input change rate, a feedback change rate and change rates fed back by a main distributing valve and a servomotor are collected, and judgment of the unsmooth fault of the proportional servo valve is conducted; and proportional servo valve feedback voltage and a main distributing valve feedback signal are collected, and judgment of the fault that a valve element of the proportional servo valve is stuck is conducted. According to the method, proportional servo valve control coil electric current information, proportional servo valve control input information, proportional servo valve feedback information, main distribution feedback information andservomotor stroke feedback information are judged comprehensively, so that the on-line faults of the proportional servo valve of the hydraulic turbine governor are diagnosed, the method is accurate and timely in judgment, the judgment basis is comprehensive, and the positions where the faults occur can be precisely judged.

Description

technical field [0001] The invention relates to the technical field of controlling a proportional servo valve of a water turbine governor, in particular to an online fault diagnosis method for a proportional servo valve of a water turbine governor. Background technique [0002] The turbine governor is an important piece of equipment in a hydropower plant. It undertakes the task of adjusting the speed of the turbine and controlling the output. The proportional servo valve is one of its most important actuators. The governor uses the proportional servo valve of the electro-hydraulic converter. The signal is converted into the oil pressure direction and flow signal, and the signal is amplified by the main pressure distribution valve to operate the guide vane servomotor, which is one of the most important links. Proportional servo valves are prone to jamming due to problems such as oil viscosity, impurity particles, and wear during actual use. The quality of the working state o...

AI Technical Summary

Problems solved by technology

This method can perform a detailed performance test on the hydraulic valve itself, but it is not suitable for the normal operation of the governor system. This offline verification method can only be used for the detection of valves after shutdown maintenance or failure. It cannot detect the occurrence of faults during operation, nor can it prevent the expansion of fault damage, which has great limitations in actual promotion and application.

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