As a key component in the steam turbine monitoring system, the Turbine Zero Speed Sensor RS-2 bears the important responsibility of real-time monitoring of the rotor speed and ensuring the safety of the shutdown state. Turbine Zero Speed Sensor RS-2 has become a mainstream device widely used by power plants at home and abroad due to its high precision, strong anti-interference and environmental adaptability. This article will deeply explore the technical principles, performance advantages and practical applications of RS-2 in power plants.

The Turbine Zero Speed Sensor RS-2 is designed based on the principle of magneto-electric induction and is mainly composed of three parts: probe, signal processing module and output interface. Its core workflow is as follows:

1. Magnetic induction signal acquisition: The probe has a built-in permanent magnet and coil. When the gear or groove on the turbine shaft passes through the sensor, the magnetic field changes and generates an alternating voltage signal in the coil.

2. Signal conversion and processing: After filtering and amplification, the original signal is converted into a standard pulse signal by the processing module, and the frequency is linearly related to the speed.

3. Zero speed judgment logic: When the pulse signal disappears and the duration exceeds the preset threshold (usually set to 1-2 seconds), the system determines that the rotor enters the zero speed state and triggers the interlock protection.

The Turbine Zero Speed Sensor RS-2 supports 4-20mA analog output or RS-485 digital communication, and can be seamlessly connected to the DCS or PLC control system to meet the real-time monitoring needs.

Turbine Zero Speed Sensor RS-2 core technical advantages

1. Extreme environment adaptability

RS-2 adopts IP67 protection grade housing and high temperature resistant ceramic packaging technology, which can operate stably in an environment of -40℃ to 120℃, and can withstand high temperature, oil pollution, vibration and other harsh working conditions around the turbine. Its electromagnetic shielding design can effectively resist strong electromagnetic interference in power plants and ensure signal transmission accuracy.

2. Micron-level detection accuracy

By optimizing the magnetic circuit structure and the combination of high-sensitivity Hall elements, the speed detection resolution of RS-2 reaches ±0.1rpm, and even in the low-speed crawling stage of the rotor (such as the cranking state), it can accurately capture weak signals below 0.5rpm.

3. Dual redundant safety design

Some high-end models are equipped with dual probe redundant configuration. When the main sensor fails, the backup probe automatically switches, and the system availability is increased to 99.99%, which meets the SIL2 safety level certification in the nuclear power field.

Installation optimization and maintenance points

1. Installation location selection: The probe should be 0.5-1.2mm away from the gear disc, avoiding the high temperature radiation area (such as near the main steam valve). It is recommended to install it at a position with strong rigidity of the base frame on the low-pressure cylinder side of the turbine to reduce vibration interference.

2. Periodic calibration: On-site calibration is required every 6 months using a standard speed generator, focusing on checking the linearity of the 0-10rpm range. In one case, failure to calibrate in time caused the sensor to drift by 0.8rpm, which almost caused a shutdown timeout.

3. Intelligent diagnosis upgrade: The new RS-2+ version integrates self-diagnosis function, which can monitor parameters such as probe impedance and temperature drift in real time, and push health status reports through the Modbus TCP protocol, reducing MTTR (mean time to repair) by 40%.

As the “nerve endings” of safe operation of power plants, Turbine Zero Speed Sensor RS-2 continue to improve monitoring reliability through technological innovation. With the advancement of smart power plant construction, this device will be further integrated with technologies such as digital twins and edge computing in the future to play a greater role in predictive maintenance. For the power plant operation and maintenance team, in-depth understanding of the technical characteristics of RS-2 and the establishment of standardized management processes are important cornerstones for ensuring the safety of the unit throughout its life cycle.

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