Instantaneous fluctuations in turbine bearing vibration
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Since February 2018, the vibration levels in the four channels of the turbine in this unit have shown frequent fluctuations, with these fluctuations being particularly evident in the two channels at the junction of the turbine and the low-pressure cylinder (VT18111X & VT811Y). The range of these fluctuations is around 10–15 μm, and the maximum vibration level reached nearly 45 μm； At the same time, there was no significant change in the vibration values of the various channels in the high-pressure and low-pressure cylinders of the compressor. Could my colleagues analyze the reasons?
Has the lubricating oil pressure been reduced? Has there been any change in the rotation speed?
Have you checked the wiring? Is the probe loose? Are there any interfering signals in the vicinity, such as those from high-current welding operations or strong magnetic fields?