In the temperature detection of steam turbine bearings, the commonly used thermal resistance is the PT100 type. In order to measure the temperature of bearings, PT100 thermal resistance are usually installed near the bearings and indirectly obtain the temperature by measuring the resistance value. The measurement of resistance value can be carried out using a bridge or resistance measuring equipment, usually requiring the conversion of resistance value into temperature value.

Due to the vibration of turbine bearings, it may have a certain impact on the temperature measurement of the thermal resistance, which may cause the thermal resistance to detach from its original position or cause poor contact, thereby affecting the accuracy of temperature measurement.

In order to reduce the impact of vibration on thermal resistance temperature measurement, the following measures can be taken to ensure good contact with the bearing to obtain accurate temperature measurement results:

• Ensure stable installation of bearings and thermal resistance to reduce mechanical stress and the possibility of poor contact;
• Select appropriate thermal resistance and installation locations to minimize the impact of vibration on temperature measurement as much as possible;
• Combining other sensors, such as accelerometers or vibration sensors, to monitor and analyze bearing vibration to gain a more comprehensive understanding of the impact of vibration on temperature measurement;
• After installation, use a suitable bridge or resistance measuring equipment to measure the resistance and ensure its accuracy and stability.

Yoyik recommends the following commonly used thermal resistance models for measuring bearing temperature.