Hydropower station set vibration measurement monitoring method

Abstract

The invention relates to the hydropower station set detection field, and particularly relates to a hydropower station set vibration measurement monitoring method. A piezoelectric acceleration sensor and a pre processing module are provided. A protection data acquisition device finishes A / D data acquisition and is in charge of suppressing sensor resonance signals at the same time; and a low-noise and low-attenuation cable is adopted between the piezoelectric acceleration sensor and the pre processing module, so as to ensure electric signals not to bring attenuation and larger noise in the transmission process. When the piezoelectric acceleration sensor is applied to hydropower station set vibration measurement, features of high sensitivity, low noise, low frequency response and the like are provided, voltage signals outputted by low-frequency small-amplitude vibration signals can be ensured to be strong enough, true low-frequency small-amplitude acceleration signals can be ensured not to be overwhelmed by the noise signals, vibration signals as low as 0.5Hz can be detected, and problems of distortion, or failure, poor precision and the like of the original inertial low-frequency vibration sensor measurement signals are solved.

Description

[0001] technical field

[0002] The invention relates to the detection field of a hydropower station unit, namely a method for measuring and monitoring the vibration of a hydropower station unit. Background technique

[0003] In the prior art, at present, the magnetoelectric (moving coil) inertial low-frequency vibration sensor is mainly used in the field of structural vibration measurement of domestic conventional hydroelectric generating units. The minimum response frequency of the sensor can reach about 0.5Hz, and the maximum response frequency can reach more than 200Hz. It is widely used in the absolute vibration displacement measurement of the frame, top cover and other positions of the hydroelectric generating set. This type of sensor can obtain the lowest frequency signal of 0.5Hz at the frame and top cover, but due to design principle problems, its reliability and stability in long-term use have been difficult to solve, and measurement signal distortion or failure, poo...

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