Turbine compressor bearing temperature
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We use compressors from Hangqi and Hitachi. Generally, the temperature of the shaft bearings is below 90°C. Sometimes there are fluctuations in this temperature. Upon inspection, no abnormalities were found in the resistors or wiring, and we also tightened the connections, but the fluctuations still occur occasionally. Could someone help explain this?
Are there any other sources of interference?
It is an instantaneous reaction; factors such as external interference and poor wire connections are involved, and one can only continue to pay attention.
Poster: You must be referring to the temperature of the turbine bearing shells. If this temperature is high, to determine the cause, check whether the shaft vibration is normal Is the thermocouple working properly? (Try another one?) ）? Is the high temperature caused by a leak in the steam chamber seal?
It is necessary to specify the interval time between 1, 3 or more pulsations, (whether it is periodic), and 2、whether the inlet and outlet valves as well as the control valves of the compressor operate during those pulsation periods For example, actions – how do they work? 3. Did the steam pressure change at that time? Has the rotation speed changed? 4. Do the two vibration probes change at the same time? 5. What is the form of the steam seal? Is there any air leakage at the site? 6. Are there any manual joints in the temperature measurement circuit? More information is needed to conduct a proper analysis
The accidental explanation is that interference is the more likely cause. The main aspects that can be checked include: 1. Whether there are any loose connections in the probe’s wiring, or whether the connections are not properly made; the inspection should cover all the connection points from the probe to the terminal in the control room ； 2. Check how many probes have mutations; consider swapping the wires with probes that do not experience mutations ； 3. Check for sources of interference. The presence of high-voltage electricity in the vicinity, any connection between the grounding system and high-voltage circuits, as well as the existence of equipment such as excitation cabinets that can cause interference, are all factors that may lead to interference; sometimes the transmitter itself can also cause interference.
This type of mutation does not take mechanical failures into account; instrument signal faults are the more likely cause. It is recommended to conduct further investigations
All other parameters are normal; it might be the probe