Vibration Failure Of Generator Hydraulic Motor

It is inevitable that there will be various abnormal conditions in the operation of water turbine and generator set. Therefore, when analyzing the fault phenomenon, it is necessary to analyze and judge according to the instrument indication, the operating sound of the unit, vibration and temperature, combined with the accident symptom and conventional treatment experience, and take the disassembly inspection of disassembled parts when necessary, so as to fundamentally eliminate the fault. When an accident occurs to the unit, no matter whether the automatic protection is activated or not, as long as the safety of the unit equipment is endangered, emergency shutdown measures should be taken immediately to avoid the occurrence of various situations. The following analysis and treatment are carried out.

1. Judgment method of vibration failure of generator hydraulic motor

Judgment of turbine vibration failure

In the actual vibration fault detection, the accuracy of vibration source judgment is improved according to the previous maintenance experience. By summarizing the characteristics of vibration in the past, the technical level and experience of power plant maintenance department can be improved, and the foundation for improving the vibration maintenance of hydraulic turbine unit can be laid.

1.1 Method of fault determination by instrument vibration measurement

In modern turbine vibration detection and treatment, instrument vibration measurement and analysis is also an important means to diagnose abnormal vibration in hydropower plants. In this method, the vibration source of abnormal vibration is found by analyzing and calculating the measured vibration waveform and related frequency value.

2. The turbine output drops

Reasons:

The turbine guide blade opening does not change and the unit output decreases obviously. There are several common reasons for turbine output decline:

First, the upstream water level drops;

Second, the intake barrage is seriously blocked;

Third, the water level of the power station tail water rises;

Fourth. The turbine guide vane shear pin is cut off, and individual guide vanes are in a free state;

Fifth, the water turbine guide mechanism card has sundries.

Inspection and treatment

First, the reservoir water level decreases, the effective head decreases, the unit efficiency decreases, the unit output is low, the reservoir water level is too low, should stop the power generation operation, storage water, power generation after the water level rises. Water level is too low, turbine efficiency is low, cavitation damage is very serious.

Second, the debris should be cleaned up in time, to prevent debris blockage, affecting the unit output.

Third, check whether the tail water level rises.

Fourth, check in detail whether the Angle of the crank arm of the hydraulic guide vane is consistent, and stop processing when the Angle of the individual guide vane is inconsistent.

Fifth, check the noise inside the water wheel and remove debris by fully open and closed action. It is necessary to open the tail pipe of the water wheel or open the water inlet hole to enter the volute and take away debris.

Sixth, hydraulic turbine output decline, often appear abnormal noise and vibration, volute pressure gauge indication decline or fluctuation is large, should be judged and analyzed according to the situation. 

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