In the power plant automation control system, the rapid action of the turbine valve is often accompanied by significant mechanical shock, which poses a challenge to the long-term stability of the LVDT displacement sensor. Take the 0508.902T0102.AW021 LVDT sensor as an example. As a key position feedback element, it needs to maintain high accuracy and reliability under complex working conditions. The following discusses how to reduce the impact of mechanical shock on sensor life through multiple links from three dimensions: system design, installation practice, and operation and maintenance.

1. Shock suppression strategy in system design

The dynamic response characteristics of the turbine valve directly determine the intensity of the mechanical shock. If the valve generates severe vibration or transient pressure fluctuations during the opening and closing process, such energy is easily transmitted through the valve body to the core structure of the LVDT sensor 0508.902T0102.AW021, resulting in magnetic ring offset or coil deformation. To alleviate this problem, the valve action curve needs to be optimized from the control logic level. For example, a staged closing technology is used: when the valve is close to the fully closed position, it switches to a low-speed mode so that the fluid kinetic energy is gradually released instead of instantaneously converted.

In addition, the layout design of the hydraulic system cannot be ignored. Adding an accumulator near the valve actuator can absorb the pressure ripples caused by fluid inertia. The gas medium filled in the accumulator has good compressibility and can buffer the sudden increase in pressure within milliseconds to prevent the impact energy from being directly transmitted to the sensor body. For long-distance pipeline layout, shortening the pipeline length and reducing the bending radius can also help to weaken the water hammer effect. Studies have shown that for every 10 meters of straight pipe section, the system impact response can be reduced by about 15%, which provides a more stable external environment for the sensor 0508.902T0102.AW021.

2. Refined requirements for installation process

The physical installation state of the LVDT displacement sensor directly affects its impact resistance. The rigid connection between the displacement sensor 0508.902T0102.AW021 housing and the valve body must ensure sufficient preload to avoid resonance caused by small vibrations. It is recommended to use a three-point suspension structure, that is, fix the sensor on a non-metallic vibration isolation base through three independent fulcrums to block the propagation path of high-frequency vibrations. At the same time, the wiring of the signal cable should avoid high-pressure oil pipes and power lines to prevent electromagnetic interference from being superimposed on mechanical vibration to form a composite damage source.

For the unique sealing design of the 0508.902T0102.AW021 displacement sensor, it is recommended to select an IP68 waterproof connector and fill the connection part with silicone sealant. This can not only resist corrosion in humid environments, but also enhance the toughness of the mechanical interface. When the sensor needs to be embedded in a high-temperature area, thermal expansion coefficient matching becomes the key-selecting a metal bracket similar to the valve body material can minimize the structural misalignment stress caused by temperature change.

3. Dynamic compensation mechanism in operation

Even if the above preventive measures are taken, it is still difficult to completely eliminate occasional abnormal impact events. At this time, the introduction of an intelligent diagnostic system becomes a necessary supplement. The health monitoring network based on fiber Bragg grating can deploy micro strain gauges inside the sensor to capture abnormal fluctuations in the displacement of the core in real time. When vibration exceeding the threshold is detected, the system automatically triggers the protection program: on the one hand, a deceleration command is sent to the DEH system, and on the other hand, the backup sensor channel is activated to achieve seamless switching.

The design of the signal conditioning circuit also undertakes a secondary protection function. Based on the traditional filtering circuit, the integrated adaptive notch filter can dynamically identify and attenuate harmonic interference of specific frequencies. For example, a power plant successfully reduced the signal noise caused by valve impact by 42% by installing an elliptical filter with a bandwidth of 0.1-10kHz at the output end of the LVDT. Although this electronic compensation cannot replace physical protection, it can effectively slow down the degradation rate of sensor performance.

4. Closed-loop management of the maintenance system

Establishing a scientific preventive maintenance system is the core guarantee for extending the service life of the LVDT sensor 0508.902T0102.AW021. It is recommended to formulate a three-level inspection standard: daily visual inspection focuses on confirming that there are no cracks on the appearance of the sensor and no loose connectors; quarterly in-depth inspection includes measuring the insulation resistance of the coil with a megohmmeter and testing the DC resistance of the primary winding with a multimeter; annual calibration requires full-stroke calibration with a standard gauge block to ensure that the output voltage and displacement are strictly linear.

When looking for high-quality, reliable LVDT Displacement Sensors, YOYIK is undoubtedly a choice worth considering. The company specializes in providing a variety of power equipment including steam turbine accessories, and has won wide acclaim for its high-quality products and services. For more information or inquiries, please contact the customer service below:
E-mail: sales@yoyik.com
Tel: +86-838-2226655
Whatsapp: +86-13618105229

Yoyik offers various types of spare parts for steam turbines, generators, boilers in power plants:
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POSITIONER ELECTRO PNEUMATIC DOUBLE 6DR 4004 6J
transducer for measurement of displacement ZDET250B
GAUGE PRESSURE 251009sW02L1500
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HEAVY DUTY NEMA LIMIT SWITCH 9007C
TEMPERATURE TRANSMITTER PT100 5333A
Air Pressure Regulator with Gauge 06E17A21AC
DC Signal Isolator (GLG) XGL-W6
SPEED TRANSMITTER JM-C-3ZS-100
Level gauge UHZ-10 C01N
LCUCabinet switch power supply YF120
24 volt proximity sensor DF310880-50-03-01
Casing Expansion Transducers TD-2 0-25mm
bi metal temperature gauge WSS-471
k type thermocouple thermometer WREK2-294
SUPPORT HOUSING GT2160107
Ethernet switches EDS-408A-MM-SC
ARGUS PRESSURE SWITCH PS511SPP10/BB10N1/S2F
THERMOMETER WTY-1021
Pressure switch 0811200-1801
MAGNETIC LIQUID LEVEL INDICATOR UHZ-10007B
RELAY PROTEKSI IN ST571H-100-VM
Thermocouple WRAK2-431NM
Sensor Unit FMU41 G2
ELECTRIC ACTUATOR SND-Q90-1S
RELAY ASSEMBLY YT-300
Vibration Sensor ST-A3-B3
LIMIT SWITCH C62ED
SENSOR SPEED TYPE DF6101 L=100mm
EDI Module TM0182-A50-B01-C00
Sodium Probe for HK-51 Model 5201S-L9-0.6M
CABLE CONNECTOR 10SL-4
electrode+Gland DZ-02-19Q
AD Change Card AC6682
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