IEC TS 60034-32:2016

IEC TS 60034-32 ®
Edition 1.0 2016-12
TECHNICAL
SPECIFICATION
colour
inside
Rotating electrical machines –
Part 32: Measurement of stator end-winding vibration at form-wound windings

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IEC TS 60034-32 ®
Edition 1.0 2016-12
TECHNICAL
SPECIFICATION
colour
inside
Rotating electrical machines –

Part 32: Measurement of stator end-winding vibration at form-wound windings

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.160.01 ISBN 978-2-8322-3714-4

– 2 – IEC TS 60034-32:2016  IEC 2016
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 10
2 Normative references . 10
3 Terms, definitions and abbreviated terms . 11
3.1 Terms and definitions . 11
3.2 Abbreviated terms . 13
4 Causes and effects of stator end-winding vibrations . 14
5 Measurement of stator end-winding structural dynamics at standstill . 15
5.1 General . 15
5.2 Experimental modal analysis . 15
5.2.1 General . 15
5.2.2 Measurement equipment . 16
5.2.3 Measurement procedure . 17
5.2.4 Evaluation of measured frequency response functions, identification of
modes . 20
5.2.5 Elements of test report . 20
5.2.6 Interpretation of results . 21
5.3 Driving point analysis . 22
5.3.1 General . 22
5.3.2 Measurement equipment . 23
5.3.3 Measurement procedure . 23
5.3.4 Evaluation of measured FRFs, identification of modes . 23
5.3.5 Elements of test report . 24
5.3.6 Interpretation of results . 24
6 Measurement of end-winding vibration during operation . 25
6.1 General . 25
6.2 Measurement equipment . 25
6.2.1 General . 25
6.2.2 Vibration transducers . 26
6.2.3 Electro-optical converters for fiber optic systems . 27
6.2.4 Penetrations for hydrogen-cooled machines . 27
6.2.5 Data acquisition . 27
6.3 Sensor installation . 28
6.3.1 Sensor locations . 28
6.3.2 Good installation practices . 29
6.4 Most relevant dynamic characteristics to be retrieved . 30
6.5 Identification of operational deflection shapes . 31
6.6 Elements of test report . 31
6.7 Interpretation of results . 32
7 Repeated measurements for detection of structural changes . 33
7.1 General . 33
7.2 Reference measurements, operational parameters and their comparability . 33
7.3 Choice of measurement actions . 35
7.4 Aspects of machine’s condition and its history . 36
Annex A (informative) Background causes and effects of stator end-winding vibrations . 37

A.1 Stator end-winding dynamics . 37
A.1.1 Vibration modes and operating deflection shape . 37
A.1.2 Excitation of stator end-winding vibrations . 38
A.1.3 Relevant vibration characteristics of stator end-windings . 38
A.1.4 Influence of operational parameter . 41
A.2 Increased stator end-winding vibrations . 41
A.2.1 General aspects of increased vibration . 41
A.2.2 Increase of stator end-winding vibrations levels over time and potential
remedial actions . 42
A.2.3 Transient conditions as cause for structural changes . 43
A.2.4 Special aspects of main insulation . 44
A.3 Operational deflection shape of global stator end-winding vibrations . 44
A.3.1 General . 44
A.3.2 Force distributions relevant for global vibrational behaviour . 44
A.3.3 Idealized global vibration behaviour while in operation . 45
A.3.4 General vibration behaviour of stator end-windings . 47
A.3.5 Positioning of sensors for the measurement of global vibration level . 49
A.4 Operational deflection shape of local stator end-winding vibrations . 51
Annex B (informative) Data visualization . 52
B.1 General . 52
B.2 Standstill measurements . 53
B.3 Measurements during operation . 56
Bibliography . 62

Figure 1 – Stator end-winding of a turbogenerator (left) and a large motor (right) at
connection end with parallel rings . 7
Figure 2 – Example for an end-winding structure of an indirect cooled machine . 8
Figure 3 – Measurement structure with point numbering and indication of excitation . 19
Figure 4 – Simplified cause effect chain of stator end-winding vibration and influencing
operational parameters . 35
Figure A.1 – Illustration of global vibration modes . 40
Figure A.2 – Example of rotational force distribution for p = 1 . 45
Figure A.3 – Example of rotating operational vibration deflection wave for p = 1 . 46
Figure A.4 – Illustration of two vibration modes with different orientation in space
(example for p = 1) . 47
Figure A.5 – on-rotational operational vibration deflection wave (example for p = 1) . 48
Figure A.6 – Amplitude and phase distribution for a general case. . 49
Figure A.7 – Sensors for the measurement of global vibration level centred in the
winding zones . 50
Figure A.8 – Measurement of global vibration level with 6 equidistantly distributed
sensors in the centre of winding zones . 50
Figure A.9 – Example – Sensor positions for the measurement of local vibration level
of the winding connection relative to global vibration level . 51
Figure B.1 – Measurement structure with point numbering and indication of excitation . 52
Figure B.2 – Example for linearity test − Force signal and variance of related FRFs . 53
Figure B.3 – Example for reciprocity test – FRFs in comparison . 53
Figure B.4 – Example – Two overlay-plots of the same transfer functions but different
dimensions . 54

– 4 – IEC TS 60034-32:2016  IEC 2016
Figure B.5 – Shapes of the 4, 6 and 8-node modes with natural frequencies,
measurement in one plane . 55
Figure B.6 – Mode shape of a typical 4-node mode with different viewing directions
(stator end-winding and outer support ring) . 55
Figure B.7 – Example – Amplitude and phase of dynamic compliance and coherence . 56
Figure B.8 – 2-pole, 60 Hz generator – Trend in displacement over
...