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Why Must Have TD-2 Thermal Expansion Sensor in Steam Turbine?

December 22, 2022
Why Must Have TD-2 Thermal Expansion Sensor in Steam Turbine?

The modern large steam turbine automatic control system is a huge and complicated system, which includes many high-precision instruments and sensors. These sensors can control and monitor the steam turbine rotational speed, vibration, temperature, and so on. Here we will introduce one of the sensors: thermal expansion sensor TD-2.


Why Must Have TD-2 Thermal Expansion Sensor in Steam Turbine?


Why Must Have TD-2 Thermal Expansion Sensor in Steam Turbine?

The steam turbine casing expansion refers to the change value of the thermal expansion of the casing, also known as the absolute expansion value. After warming up, the steam turbine expands with the increase of casing temperature. When the casing expands, due to the different dead center positions of the sliding pin, the casing may extend to the compression side or low pressure side, or it may expand to the left or right. In order to prevent uneven thermal expansion, unsmooth jamming or friction accidents of dynamic and static parts of the casing and ensure the safe operation of the unit, the casing expansion value must be monitored.


The thermal expansion sensor TD-2 is used to monitor the thermal expansion of steam turbine cylinder and rotor in varying degrees when the temperature changes or the operating conditions change during startup and shutdown. The sensor is used with thermal expansion monitor DF9032 MaxA.



thermal expansion monitor DF9032 MaxA

Thermal Expansion Monitor DF9032 MaxA



In order to ensure the normal use of the thermal expansion sensor TD-2 and obtain the proper monitoring effect, attention shall be paid to the following when installing the thermal expansion sensor TD-2:


When installing and adjusting the thermal expansion sensor under normal conditions, the rotor thrust disc shall be pushed to the working surface for zero position locking under normal temperature. If the sensor needs to be replaced after the unit startup, the turbine is in a hot state and the rotor has obtained a certain expansion. In this state, if you wait for the equipment to cool to install and zero the sensor, it will take a lot of time. If the faulty sensor is replaced in the hot state, the existing axial and radial expansion of the rotor is an important factor affecting the sensor installation. The radial expansion affects the adjustment of the clearance between the sensor and the rotor boss during installation, and the axial expansion affects the determination of the zero position of the sensor and the compensation and correction of the heat expansion.

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