Speed ​​sensor CS-1-UNF-A075-B08 uses electromagnetic induction principle to realize speed measurement function. Its internal structure is mainly composed of induction element and signal processing circuit. When the rotating parts of the turbine, such as the gear plate with a specific tooth shape, rotate at high speed near the sensor, the change of the gap between the teeth of the gear will cause the magnetic field around the sensor to change alternately. This dynamic change of the magnetic field is keenly captured by the induction element, and then an induced electromotive force is generated in the induction element.

The generated induced electromotive force signal will then be transmitted to the signal processing circuit. In the circuit, the signal will first undergo amplification processing to enhance the weak induction signal to an intensity that is convenient for subsequent processing. Then, through the shaping circuit, the original induction signal is converted into a standard square wave pulse signal. The frequency of these square wave pulse signals is closely related to the speed of the turbine. The higher the speed, the more pulses are generated per unit time, and vice versa. By accurately measuring the frequency of these pulse signals and according to the pre-set conversion relationship, the real-time speed of the steam turbine can be accurately calculated.

Performance characteristics

1. High-precision measurement: In the scenario of steam turbine speed measurement, the importance of accuracy is self-evident. CS-1-UNF-A075-B08 has extremely high accuracy, and the speed linearity can reach ±0.05%, which can provide extremely reliable data support for steam turbine operation control. In key stages such as steam turbine startup, speed increase, speed reduction and load adjustment, the sensor can accurately reflect the dynamic changes of speed, ensuring that the control system can respond promptly and appropriately based on accurate speed information, thereby maintaining the stable operation of the steam turbine. For example, during the start-up process of the steam turbine, the speed increase can be accurately monitored to ensure that it increases smoothly according to the predetermined speed increase curve, preventing damage to the equipment due to abnormal speed increase.

2. Wide measurement range: The sensor has a wide measurement range of 0~20KHz (depending on the external gear parameters), which can fully meet the speed measurement needs of steam turbines of different models. Whether it is a small steam turbine or a large megawatt-class steam turbine, CS-1-UNF-A075-B08 can provide an adaptive measurement range according to the actual working conditions, showing strong adaptability.

3. Strong anti-interference ability: The use of metal soft shielding wire can effectively suppress external electromagnetic interference and ensure stable and accurate output of measurement signals in complex electromagnetic environments. There are many sources of interference when the steam turbine is running, and the good anti-interference performance of the sensor can greatly reduce the measurement error and signal fluctuation caused by interference, providing a strong guarantee for the long-term stable operation of the steam turbine.

4. Good environmental adaptability: The operating temperature range is – 40°C~+120°C, and the protection level reaches IP67. It can adapt to the high temperature environment during the operation of the steam turbine, as well as possible water vapor, dust and other harsh conditions. Whether it is in the low temperature environment at the beginning of the unit startup in the cold winter, or in the high temperature full load operation in the summer, or in complex environments such as high humidity, the sensor can work normally to ensure the stability and accuracy of the speed measurement.

5. High resolution and forward and reverse resolution: The resolution is as high as 1 division, which can accurately distinguish the slight changes in the speed. At the same time, it has the forward and reverse resolution function, which can monitor the rotation direction of the rotating parts of the steam turbine in real time, providing key information for a comprehensive understanding of the operating status of the steam turbine.

6. Low noise output: The noise level is ≤1mVpp, and the output signal is pure, which is conducive to subsequent signal processing and analysis, and further improves the reliability of the measurement data.

7. Passive design: No external power supply is required, which simplifies the installation and use process, reduces the possible failure points caused by power supply problems, and improves the overall reliability of the system.

Application in steam turbines

1. Speed ​​monitoring: Real-time and continuous monitoring of the speed of the steam turbine, and timely transmission of the measurement data to the control system. The operator can intuitively understand the real-time speed of the steam turbine through the control system interface and determine whether it is in normal operation. For example, during the normal operation of the steam turbine, by continuously monitoring the speed, abnormal fluctuations in the speed can be discovered in time, so that corresponding measures can be taken to adjust quickly to ensure the stable operation of the steam turbine.

2. Overspeed protection: When the steam turbine is running, once overspeed occurs, it will pose a great threat to the safety of equipment and personnel. CS-1-UNF-A075-B08, as a key component of the overspeed protection system, can monitor the speed of the steam turbine in real time. When the speed exceeds the preset safety threshold, the sensor will quickly transmit the overspeed signal to the protection system. After receiving the signal, the protection system will immediately take corresponding protection measures, such as quickly closing the steam inlet valve of the steam turbine to quickly decelerate the steam turbine, avoiding serious equipment damage and safety accidents caused by overspeed, and building a solid defense line for the safe operation of the steam turbine.

3. Performance optimization and fault diagnosis: The speed data provided by the sensor can be used for performance optimization and fault diagnosis of the steam turbine. Through in-depth analysis of the speed data accumulated over a long period of time, technicians can understand the operating performance of the steam turbine under different working conditions, explore the optimal parameter range of equipment operation, and thus optimize and adjust the operation of the steam turbine to improve the operating efficiency and economy of the equipment. At the same time, when a turbine fails, abnormal changes in speed data can often provide important clues for fault diagnosis. By analyzing the changing trend and fluctuation of the speed data and the correlation with other operating parameters, technicians can quickly and accurately determine the cause of the fault, formulate corresponding maintenance plans, shorten equipment downtime, and improve equipment availability.

The speed sensor CS-1-UNF-A075-B08 plays an irreplaceable role in the measurement of steam turbine speed with its unique working principle, excellent performance characteristics and precise technical parameters. With the continuous development of steam turbine technology, the requirements for speed measurement accuracy and reliability are increasing. CS-1-UNF-A075-B08 will also continue to be optimized and upgraded to provide a more solid guarantee for the safe and efficient operation of steam turbines.

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