TSI (Turbine Supervisory Instrument) is a reliable multi-channel monitoring instrument that can continuously measure the mechanical operating parameters of the rotor and cylinder of the turbine-generator set, display the operating status of the machine, provide output signals to the signal instrument, and issue an alarm or even automatically shut down the turbine when the set operating limit is exceeded. In addition, TSI can also provide measurement signals for fault diagnosis and cooperate with other systems for fault analysis.
TSI monitoring items:
Bearing vibration
According to the relative position of the detection body, vibration can be divided into three types: absolute vibration of the shaft, absolute vibration of the bearing seat, and relative vibration of the shaft and the bearing seat. According to the principle of vibration, the axis trajectory can be obtained by synthesizing the vibration in the X and Y directions. There is no necessary internal connection between the vertical and horizontal directions of the shaft, that is, the vibration in the vertical direction (Y direction) is already very large, while the vibration in the horizontal direction (X direction) may be normal. Therefore, a probe is installed in the vertical and horizontal directions. Due to the influence of the horizontal center plane on the installation, in fact, the two probes can be installed perpendicular to each other. When the gap between the end of the sensor and the surface of the rotating shaft changes, the sensor outputs an AC signal to the plate, and the plate calculates the peak-to-peak (P-P) value of the gap change (i.e. vibration).
It has been shown in the measurement of shaft vibration that the vibration of the large shaft can be transmitted to the bearing shell. The speed sensor is used to measure the movement speed of the housing relative to the free space. The plate detects and integrates the speed signal from the sensor, converts it into a displacement value, and calculates the corresponding peak-to-peak position.
The steam turbine has 7 groups of vibration measuring points, each group of measuring points includes X-axis and Y-axis shaft vibration and corresponding bearing vibration. X-axis shaft vibration is installed in a single direction (participates in protection), and Y-axis shaft vibration and bearing vibration are installed in the same direction to form a composite vibration and also participate in protection. The vibration alarm value is 125um, and the trip value is 254um.
