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대형 터빈-발전기에서의 유체 불안정진동 해소사례

A Case Study on the Vibration by Fluid Induced Instability at Large Steam Turbine-generator

  • 발행 : 2008.02.20

초록

This case study refers to turbine-generator with retrofitted turbine rotor. Vibration problem occurring after the retrofit was mainly due to high vibration from exciter side. However, repeated test run and operation during scheduled maintenance caused high vibration from generator bearing, and post-overhaul test run before turbine vibration correction caused oil whip on the bearing. This case study shows how to analyze vibration condition of high turbine generator vibration detected during the post-overhaul test run and vibration condition of offline and online data to reflect it on establishing maintenance schedule and overhaul correction procedure. Vibration data could be acquired during steady load operation or even with varying speed and load. Each data is important for machinery condition evaluation. This case study shows that the vibration data during extreme condition is the key factor in analysis, which helps to find the machinery problem.

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참고문헌

  1. ISO Standard, 1996, 'Mechanical Vibration of Non-reciprocating Machine-measurements on Rotating Shafts and Evaluation-', ISO/IS 7919
  2. Bong, S. K., et. al., 2007, 'Machinery Condition Monitoring and Diagnosis', KPS
  3. Donald, E. B., Charles, T. H., Edited by Bob Grissom, 2002, 'Fundamentals of Rotating Machinery Diagnostics', Bently Pressurized Bearing Press, pp. 209-272
  4. ISO Standard, 1990, 'Vibration and Shock - Experimental Determination of Mechanical Mobility -, Part 2 : Measurements Using Single-point Translation Excitation with an Attached Vibration Excitation', ISO7626-2
  5. Han, S. W. and Roh, C. W., 2007, Maintenance Engineering Report, No. 62202-240, KPS Technology Research and Development Institute
  6. Kim, I. C., Joo, I. G. and Kim, M. S., 2007, Maintenance Engineering Report No. 62202-231, KPS Technology Research and Development Institute