Online Monitoring System for Generators in Nuclear Power Plants

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1 Online Monitoring for Generators in Nuclear Power Plants Dipl. Ing. Otto Gansner PI Electronics AG 5405 Baden-Dättwil

2 Contents PI Electronics AG

3 PI Electronics AG Baden-Dättwil, ABB Research Center NI Alliance partner for 16 years 12 employees Software development integration Electronics engineering EMC consulting Execution of measurements

4 PI Electronics AG Integration Hardware Development Software Development Measurement and Control Devices Analog Instrumentation (Signal Conditioning) (LabVIEW, RT, FPGA, DSC, TestStand) Image Processing Digital Technology Sensor Data Automated Test Equip. Motion Control

5 One monitoring system for the complete power plant

6 of remote monitoring centre architecture HQ Remote Centre Training and support In house remote monitoring center Local server DAQ modules Sensors Equipments DB WEB Servers Firewall Local User Local Servers Plant A Internet / Intranet Plant B Local User Local Servers Shaft Vibration, PD,RFM,VIC, ROMON WIND FAS Sensors Gas Turbine, ST, Generator, Boiler Wind Turbine

7 Stator windings of large generators Vibration Sensors Winding overhang Front end (Turbine) Rotor Vibration Sensors Rear end Vibration Sensors Terminal box (3 phase connection)

8 Instrumentations As a standard 12 sensors are fitted, 6 at each end of the generator Piezoelectric sensor mounted in an isolated block Fiber optical sensor installation

9 Possible causes of damage Long-term operation with high vibration levels can lead to fatigue failure of winding components and a forced outage The higher vibration amplitude, and the higher the acceleration at heightened amplitudes, the higher is the risk of some weakness especially in the end winding support Allow to decide whether tightening of the end-windings will be required during next planned outage Early signs of damage caused by high end winding vibrations

10 Case study After a period of stable vibration, there was a strong increase in vibration amplitudes, which lead to the decision for a quick repair Decision for a scheduled outage

11 and Benefit Main Targets Enhanced operational reliability, through the reduction of unscheduled and costly downtime, using supervision of online monitoring. Safe operation for an extended period may be achieved if a fault is monitored using online trending capability. Efficient planning of preventative and condition-based maintenance. Optimized reinvestment planning for lifetime extension. Access to Alstom s Expert Center and their knowledge base and fleet experience.

12 Customer Service

13 Communication Use of Delay loaded DLLs

14 Software (1) Use of LV DLL (Communication of different applications)

15 Software (2) DAQmx analog edge start trigger, delay for the first call (reference voltage will be created at that analog value onboard the DAQ device) Specify hysteresis as a condition for analog triggering (adaptive) Trigger Level Level Hysteresis

16 Hardware Connection of fiber optic and piezo-electrical sensors Ethernet connection

17 Measurement presentation Measured amplitude and phase Alarming control with different limits

18 Commissioning Tools Helps to reduce time for starting up Fast system diagnosis Simulation mode for calculation evaluation

19 No limit for LabVIEW and c++ working together Thank you for your attention For further information please visit our stand at the exhibition

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