Vibration Monitoring System for Steam Turbine

Monitoring System for Steam Turbine Generator Train

HPTURBINE

GENE-RATOR

STEAM VALVE

LP TURBINE

① ① ① ① ① ①②③ ④

⑤

⑥ ⑦ ⑧

Bearing

①

No Monitoring Parameter No Monitoring Parameter

① Shaft Vibration ⑤ Case Expansion

② Axial Position ⑥ Rotating/Zero Speed

③ Eccentricity p-p ⑦ Phase Marker

④ Differential Expansion ⑧ Valve Posotion

Monitoring ParametersMonitoring Parameter Description

Shaft Vibration Relative vibration (displacement) between shaft and bearing at each bearing. 1 or 2 points par each bearing.

Bearing Vibration Absolute vibration (velocity or acceleration) of bearing housing/casing. 1 or 2 points par each bearing.

Axial Position

To monitor clearance of thrust bearing. Critical monitoring parameter during operating machine, especially at start up and shut down.

Eccentricity p-p

Shaft can be bent because of its own weight and partial heating. It’s necessary to monitor bending of rotor as observing shaft eccentricity during slow speed turning at non-operating of turbine.

Monitoring ParametersMonitoring Parameter Description

Differential Expansion

Differential Expansion between rotor and casing because of different thermal expansion of them during start up and operating of turbine.

Case Expansion Thermal expansion of turbine case. Contortion of case expansion is also monitored.

Rotating Speed Rotating speed of turbine shaft (rotor).

Phase Marker Phase reference for vibration analysis. Detection of one rotation for measuring eccentricity p-p.

Valve Position

To observe opening position of main steam inlet valve of steam turbine. This is used for controlling rotating speed of turbine.

Vibration & Displacement Transducer

VK SeriesVibration Transducer

CA Series Acceleration Transducer

CV SeriesVelocity Transducer

RD SeriesTacho Driver

MS SeriesMagnetic Pickup

LVDT SeriesDifferential Transformer

VM-11 SeriesSignal Conditioner

VM-5 Series TSI Monitor

Monitor

VM-15 Monitor

VM-16 Monitor

MP-1 Series Machine Protection

System

Oscillator-Demodulator(Driver)

VibrationMonitor

Sensor

Sensor

Rotor

45° 45°

Vertical center

Extension cable

Radial Shaft Vibration

Radial Shaft Vibration

Radial Shaft Vibration

Casing Vibration

VibrationMonitor

Accelerometer

Double-Helical Gear

Casing Vibration

Casing Vibration

Axial Position

ThrustMonitor

Sensor

Rotor

Oscillator-Demodulator(Driver)Extension

cable

Axial Position

Speed Monitor(Tachometer)

Rotor

Sensor

Shaft rotational speed

Extension cable

Oscillator-Demodulator(Driver)

Rotating Speed

Phase Marker

Differential Expansion

Ramp targettype

DifferentialExpansion

Monitor

Driver

SensorRotor

Rotor

RotorComplementary input type

Ramp targettype

Differential Expansion

Differential Expansion

LVDTTransmitter

LVDT

Case ExpansionMonitor

Case Expansion

LVDT (Linear Variable Differential Transformer)

EccentricityMonitorDriver

Sensor forEccentricity

Rotor

Sensor forPhase Mark Sensor for

Phase Mark

Eccentricity peak to peak

Eccentricity peak to peak

Phase Marker for Eccentricity

LVDT

Actuator

Main Steam

Valve

LVDTTransmitter

Valve PositionMonitor

Rotor

Valve Position