Summary The temperature of the water turbine bearing varies depending on whether the rotating parts and the bearing itself are normal, and the cooling water amount, water temperature, room temperature, oil te
The temperature of the water turbine bearing varies depending on whether the rotating parts and the bearing itself are normal, and the cooling water amount, water temperature, room temperature, oil temperature and other conditions. From the point of view of the maintenance of the water turbine bearings, it is always desirable to press the bearing temperature. Conditions such as cooling water setting, water temperature, and room temperature were corrected to the same level for monitoring. To meet this condition, it is not difficult to achieve in a stable operating state, and it is difficult to achieve it in a transitional state. For example, when starting, the bearings, lubricants, etc. are warmed from the cold state until the generated heat and the emitted heat are balanced. During this period, the change in heat has a certain time constant and shows a linear hysteresis. For this reason, two methods are currently implemented for processing: linear lag processing under limited conditions} or linear lag processing is not considered, and processing is performed according to the rate of change of time. However, regardless of the type of field stage, the measured value, converted value, and time change rate of the bearing temperature must also be monitored at the same time.
Before the failure of the water turbine bearing, the temperature change rate was abnormal in most cases. The actual conditions show that the time change rate of the water turbine bearing temperature is mainly affected by the operating conditions (uniformity of the oil temperature in the bearing oil tank and the increase of the unit speed when the unit starts). Rate, etc.). If the oil tank is mixed with water, the bearing temperature will decrease for a short time.
