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BSI PD CLC IEC/TS 60034-32:2021

BSI PD CLC IEC/TS 60034-32:2021

$198.66

Rotating electrical machines – Measurement of stator end-winding vibration at form-wound windings

Published By Publication Date Number of Pages
BSI 2021 68
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This part of IEC 60034 is intended to provide consistent guidelines for measuring and reporting end-winding vibration behaviour during operation and at standstill. It

  • defines terms for measuring, analysis and evaluation of stator end-winding vibration and related structural dynamics,

  • gives guidelines for measuring dynamic / structural characteristics offline and stator endwinding vibrations online,

  • describes instrumentation and installation practices for end-winding vibration measurement equipment,

  • establishes general principles for documentation of test results,

  • describes the theoretical background of stator end-winding vibrations.

This part of IEC 60034 is applicable to:

  • three-phase synchronous generators, having rated outputs of 150 MVA and above driven by steam turbines or combustion turbines;

  • three-phase synchronous direct online (DOL) motors, having rated output of 30 MW and above.

This document is limited to the description of measurement procedures for 2-pole and 4-pole machines. For smaller ratings of machines than defined in this document, agreement can be made between the vendor and the purchaser for the selection of measurements in this document to be applied.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 Annex ZA (normative)Normative references to international publications with their corresponding European publications
7 CONTENTS
10 FOREWORD
12 INTRODUCTION
Figures
Figure 1 – Stator end-winding of a turbogenerator (left)and a large motor (right) at connection end with parallel rings
13 Figure 2 – Example for an end-winding structure of an indirect cooled machine
15 1 Scope
2 Normative references
16 3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
18 3.2 Abbreviated terms
19 4 Causes and effects of stator end-winding vibrations
20 5 Measurement of stator end-winding structural dynamics at standstill
5.1 General
5.2 Experimental modal analysis
5.2.1 General
21 5.2.2 Measurement equipment
22 5.2.3 Measurement procedure
24 Figure 3 – Measurement structure with point numbering and indication of excitation
25 5.2.4 Evaluation of measured frequency response functions, identification of modes
5.2.5 Elements of test report
Table 1 – Node number of highest mode shape in relevant frequency rangeand minimum number of measurement locations
26 5.2.6 Interpretation of results
27 5.3 Driving point analysis
5.3.1 General
28 5.3.2 Measurement equipment
5.3.3 Measurement procedure
5.3.4 Evaluation of measured FRFs, identification of modes
29 5.3.5 Elements of test report
5.3.6 Interpretation of results
30 6 Measurement of end-winding vibration during operation
6.1 General
6.2 Measurement equipment
6.2.1 General
31 6.2.2 Vibration transducers
32 6.2.3 Electro-optical converters for fiber optic systems
6.2.4 Penetrations for hydrogen-cooled machines
6.2.5 Data acquisition
33 6.3 Sensor installation
6.3.1 Sensor locations
34 6.3.2 Good installation practices
35 6.4 Most relevant dynamic characteristics to be retrieved
36 6.5 Identification of operational deflection shapes
6.6 Elements of test report
37 6.7 Interpretation of results
38 7 Repeated measurements for detection of structural changes
7.1 General
7.2 Reference measurements, operational parameters and their comparability
40 7.3 Choice of measurement actions
Figure 4 – Simplified cause effect chain of stator end-winding vibrationand influencing operational parameters
41 7.4 Aspects of machine’s condition and its history
Table 2 – Possible measurement actions to gain insight intovarious aspects of the cause-effect chain.
42 Annex A (informative)Background causes and effects of stator end-winding vibrations
A.1 Stator end-winding dynamics
A.1.1 Vibration modes and operating deflection shape
43 A.1.2 Excitation of stator end-winding vibrations
A.1.3 Relevant vibration characteristics of stator end-windings
45 Figure A.1 – Illustration of global vibration modes
46 A.1.4 Influence of operational parameter
A.2 Increased stator end-winding vibrations
A.2.1 General aspects of increased vibration
47 A.2.2 Increase of stator end-winding vibrations levels over time and potential remedial actions
48 A.2.3 Transient conditions as cause for structural changes
49 A.2.4 Special aspects of main insulation
A.3 Operational deflection shape of global stator end-winding vibrations
A.3.1 General
A.3.2 Force distributions relevant for global vibrational behaviour
50 A.3.3 Idealized global vibration behaviour while in operation
Figure A.2 – Example of rotational force distribution for p = 1
51 Figure A.3 – Example of rotating operational vibration deflection wave for p = 1
52 A.3.4 General vibration behaviour of stator end-windings
Figure A.4 – Illustration of two vibration modes with different orientation in space (example for p = 1)
53 Figure A.5 – on-rotational operational vibration deflection wave (example for p = 1)
54 A.3.5 Positioning of sensors for the measurement of global vibration level
Figure A.6 – Amplitude and phase distribution for a general case.
55 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
56 A.4 Operational deflection shape of local stator end-winding vibrations
Figure A.9 – Example – Sensor positions for the measurement of local vibration level of the winding connection relative to global vibration level
57 Annex B (informative)Data visualization
B.1 General
Figure B.1 – Measurement structure with point numbering and indication of excitation
58 B.2 Standstill measurements
Figure B.2 – Example for linearity test  Force signal and variance of related FRFs
Figure B.3 – Example for reciprocity test – FRFs in comparison
59 Figure B.4 – Example – Two overlay-plots of the same transfer functions but different dimensions
60 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)
61 B.3 Measurements during operation
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
62 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
63 Figure B.11 – 2-pole, 60 Hz generator – Example of variation in vibration levels at comparable operating conditions
64 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
65 Figure B.14 – 2-pole, 60 Hz generator – Displacement spectrum
Figure B.15 – 2-pole, 60 Hz generator – Velocity spectrum
66 Figure B.16 – 2-pole, 60 Hz generator – Acceleration spectrum
67 Bibliography

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BSI PD CLC IEC/TS 60034-32:2021
$198.66