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IEC/TS 60034-32 Ed. 1.0 en:2016 Rotating electrical machines - Part 32: Measurement of stator end-winding vibration at form-wound windings, 2016
- CONTENTS
- FOREWORD
- INTRODUCTION
- 1 Scope
- 2 Normative references
- 3 Terms, definitions and abbreviated terms [Go to Page]
- 3.1 Terms and definitions
- 3.2 Abbreviated terms
- 4 Causes and effects of stator end-winding vibrations
- 5 Measurement of stator end-winding structural dynamics at standstill [Go to Page]
- 5.1 General
- 5.2 Experimental modal analysis [Go to Page]
- 5.2.1 General
- 5.2.2 Measurement equipment
- 5.2.3 Measurement procedure
- 5.2.4 Evaluation of measured frequency response functions, identification of modes
- 5.2.5 Elements of test report
- 5.2.6 Interpretation of results
- 5.3 Driving point analysis [Go to Page]
- 5.3.1 General
- 5.3.2 Measurement equipment
- 5.3.3 Measurement procedure
- 5.3.4 Evaluation of measured FRFs, identification of modes
- 5.3.5 Elements of test report
- 5.3.6 Interpretation of results
- 6 Measurement of end-winding vibration during operation [Go to Page]
- 6.1 General
- 6.2 Measurement equipment [Go to Page]
- 6.2.1 General
- 6.2.2 Vibration transducers
- 6.2.3 Electro-optical converters for fiber optic systems
- 6.2.4 Penetrations for hydrogen-cooled machines
- 6.2.5 Data acquisition
- 6.3 Sensor installation [Go to Page]
- 6.3.1 Sensor locations
- 6.3.2 Good installation practices
- 6.4 Most relevant dynamic characteristics to be retrieved
- 6.5 Identification of operational deflection shapes
- 6.6 Elements of test report
- 6.7 Interpretation of results
- 7 Repeated measurements for detection of structural changes [Go to Page]
- 7.1 General
- 7.2 Reference measurements, operational parameters and their comparability
- 7.3 Choice of measurement actions
- 7.4 Aspects of machine’s condition and its history
- Annex A (informative)Background causes and effects of stator end-winding vibrations [Go to Page]
- A.1 Stator end-winding dynamics [Go to Page]
- A.1.1 Vibration modes and operating deflection shape
- A.1.2 Excitation of stator end-winding vibrations
- A.1.3 Relevant vibration characteristics of stator end-windings
- A.1.4 Influence of operational parameter
- A.2 Increased stator end-winding vibrations [Go to Page]
- A.2.1 General aspects of increased vibration
- A.2.2 Increase of stator end-winding vibrations levels over time and potential remedial actions
- A.2.3 Transient conditions as cause for structural changes
- A.2.4 Special aspects of main insulation
- A.3 Operational deflection shape of global stator end-winding vibrations [Go to Page]
- A.3.1 General
- A.3.2 Force distributions relevant for global vibrational behaviour
- A.3.3 Idealized global vibration behaviour while in operation
- A.3.4 General vibration behaviour of stator end-windings
- A.3.5 Positioning of sensors for the measurement of global vibration level
- A.4 Operational deflection shape of local stator end-winding vibrations
- Annex B (informative)Data visualization [Go to Page]
- B.1 General
- B.2 Standstill measurements
- B.3 Measurements during operation
- Bibliography
- Figures [Go to Page]
- Figure 1 – Stator end-winding of a turbogenerator (left)and a large motor (right) at connection end with parallel rings
- Figure 2 – Example for an end-winding structure of an indirect cooled machine
- Figure 3 – Measurement structure with point numbering and indication of excitation
- Figure 4 – Simplified cause effect chain of stator end-winding vibrationand influencing operational parameters
- Figure A.1 – Illustration of global vibration modes
- Figure A.2 – Example of rotational force distribution for p = 1
- Figure A.3 – Example of rotating operational vibration deflection wave for p = 1
- Figure A.4 – Illustration of two vibration modes with different orientation in space (example for p = 1)
- Figure A.5 – on-rotational operational vibration deflection wave (example for p = 1)
- Figure A.6 – Amplitude and phase distribution for a general case.
- Figure A.7 – Sensors for the measurement of global vibration level centred in the winding zones
- Figure A.8 – Measurement of global vibration level with 6 equidistantly distributed sensors in the centre of winding zones
- Figure A.9 – Example – Sensor positions for the measurement of local vibration level of the winding connection relative to global vibration level
- Figure B.1 – Measurement structure with point numbering and indication of excitation
- Figure B.2 – Example for linearity test Force signal and variance of related FRFs
- Figure B.3 – Example for reciprocity test – FRFs in comparison
- Figure B.4 – Example – Two overlay-plots of the same transfer functions but different dimensions
- Figure B.5 – Shapes of the 4, 6 and 8-node modes with natural frequencies, measurement in one plane
- Figure B.6 – Mode shape of a typical 4-node mode with different viewing directions (stator end-winding and outer support ring)
- Figure B.7 – Example – Amplitude and phase of dynamic compliance and coherence
- Figure B.8 – 2-pole, 60 Hz generator – Trend in displacement over time for 10 stator end-winding accelerometers, as well as one accelerometer mounted on the stator core
- Figure B.9 – 2-pole, 60 Hz generator – End-winding vibration, winding temperature trends over time, constant stator current
- Figure B.10 – 2-pole, 60 Hz generator – End-winding vibration,stator current trends over time, constant winding temperature
- Figure B.11 – 2-pole, 60 Hz generator – Example of variation in vibration levels at comparable operating conditions
- Figure B.12 – 2-pole, 60 Hz generator – Raw vibration signal, acceleration waveform
- Figure B.13 – 2-pole, 60 Hz generator – FFT and double integratedvibration signal, displacement spectrum
- Figure B.14 – 2-pole, 60 Hz generator – Displacement spectrum
- Figure B.15 – 2-pole, 60 Hz generator – Velocity spectrum
- Figure B.16 – 2-pole, 60 Hz generator – Acceleration spectrum
- Table 1 – Node number of highest mode shape in relevant frequency rangeand minimum number of measurement locations
- Table 2 – Possible measurement actions to gain insight intovarious aspects of the cause-effect chain. [Go to Page]
