oSIST prEN IEC 60034-27-2:2022
(Main)Rotating electrical machines - Part 27-2: On-line partial discharge measurements on the stator winding insulation of rotating electrical machines
Rotating electrical machines - Part 27-2: On-line partial discharge measurements on the stator winding insulation of rotating electrical machines
Drehende elektrische Maschinen – Teil 27-2: On-line-Teilentladungsmessungen an der Statorwicklungsisolierung drehender elektrischer Maschinen
Machines électriques tournantes - Partie 27-2: Mesurages en fonctionnement des décharges partielles effectués sur le système d’isolation des enroulements statoriques
Električni rotacijski stroji - 27-2 del: Spletne meritve delne izpraznitve na izolaciji statorskih navitij neaktivnih električnih rotacijskih strojev
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN IEC 60034-27-2:2022
01-julij-2022
Električni rotacijski stroji - 27-2 del: Spletne meritve delne izpraznitve na izolaciji
statorskih navitij neaktivnih električnih rotacijskih strojev
Rotating electrical machines - Part 27-2: On-line partial discharge measurements on the
stator winding insulation of rotating electrical machines
Ta slovenski standard je istoveten z: prEN IEC 60034-27-2:2022
ICS:
29.160.01 Rotacijski stroji na splošno Rotating machinery in
general
oSIST prEN IEC 60034-27-2:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN IEC 60034-27-2:2022
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oSIST prEN IEC 60034-27-2:2022
2/2099/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60034-27-2 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2022-06-03 2022-08-26
SUPERSEDES DOCUMENTS:
2/2070/CC, 2/2072/DTS
IEC TC 2 : ROTATING MACHINERY
SECRETARIAT: SECRETARY:
United Kingdom Mr Charles Whitlock
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
Other TC/SCs are requested to indicate their interest, if any, in this
CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
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is drawn to the fact that this Committee Draft for Vote (CDV) is
submitted for parallel voting.
The CENELEC members are invited to vote through the
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This document is still under study and subject to change. It should not be used for reference purposes.
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and to provide supporting documentation.
TITLE:
Rotating electrical machines – Part 27-2: On-line partial discharge measurements on the stator winding insula-
tion of rotating electrical machines
PROPOSED STABILITY DATE: 2025
NOTE FROM TC/SC OFFICERS:
This project was changed from TS into an IS, IEC 60034-27-2 ED1, as per documents 2/2086/Q and 2/2093/RQ.
Copyright © 2022 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to download this
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.
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CONTENTS
FOREWORD . 6
INTRODUCTION . 2
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Cause and effects of on-line PD . 6
5 Noise and disturbances . 7
General . 7
Noise and disturbance sources . 7
6 Measuring techniques and instruments . 8
General . 8
Pulse propagation in windings . 8
Signal transfer characteristics . 9
PD sensors . 12
General . 12
Design of PD sensors . 12
Reliability of PD sensors . 13
PD measuring device . 13
PD measuring parameters . 13
General . 13
PD magnitude . 13
Additional PD parameters . 14
7 Installation of measuring systems . 14
General . 14
Installation of PD sensors . 14
Outside access point and cabling . 15
Installation of the PD measuring device . 15
Installation of operational data acquisition systems . 16
8 Normalization of measurements . 16
General . 16
Normalization for low frequency systems . 16
General . 16
Normalization procedure . 17
Normalization / sensitivity check for high and very high frequency systems . 18
Specification for the electronic pulse generation . 18
Configuration of the machine . 19
Sensitivity check . 19
9 Measuring procedures . 19
General . 19
Machine operating parameters . 20
Baseline measurement . 20
General . 20
Comprehensive test procedure . 20
Periodic measurements . 21
Continuous measurements . 22
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10 Visualization of measurements . 22
General . 22
Visualization of trending parameters . 22
Visualization of PD patterns . 23
11 Interpretation of on-line measurements. 26
General . 26
Evaluation of basic trend parameters. 26
Evaluation of PD patterns . 27
General . 27
PD pattern interpretation . 27
Effect of machine operating factors . 28
General . 28
Machine operating factors . 28
Steady state load conditions . 29
Transient load conditions . 29
12 Test report. 30
Annex A (informative) Nature of PD in rotating electrical machines . 33
A.1 Types of PD in rotating electrical machines . 33
A.1.1 General . 33
A.1.2 Internal discharges . 33
A.1.3 Slot discharges . 33
A.1.4 Discharges in the end-winding . 34
A.1.5 Conductive particles . 34
A.2 Arcing and sparking . 34
A.2.1 General . 34
A.2.2 Arcing at broken conductors . 34
A.2.3 Vibration sparking . 34
Annex B (informative) Disturbance rejection and signal separation . 35
B.1 General . 35
B.2 Frequency domain separation . 35
B.3 Time domain separation . 35
B.4 Combination of frequency and time domain separation . 36
B.5 Synchronous multi-channel measurement . 37
B.6 Signal gating . 37
B.7 Pattern recognition . 38
Annex C (informative) Examples of Phase Resolved Partial Discharge (PRPD) pattern. 40
C.1 General . 40
C.2 Principal appearance of phase resolved PD patterns . 40
C.3 Example of typical PRPD patterns recorded in laboratory . 42
C.3.1 General . 42
C.3.2 Internal discharges . 42
C.3.3 Slot partial discharges . 44
C.3.4 Discharges in the end-winding . 45
C.4 Example of typical PRPD patterns recorded on-line . 47
C.4.1 General . 47
C.4.2 Internal discharges . 47
C.4.3 Slot partial discharges . 49
C.4.4 Discharges in the end-winding . 50
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C.5 Other complex examples . 53
Annex D (normative) Specifications for conventional PD coupling capacitors . 55
D.1 General . 55
D.2 Datasheet information . 55
D.3 Type tests . 55
D.3.1 Voltage endurance . 55
D.3.2 Tracking resistance? . 55
D.3.3 Lightning impulse test . 55
D.3.4 Dissipation factor . 55
D.3.5 Capacitance stability in temperature . 56
D.3.6 Thermal cycling . 56
D.3.7 Frequency response . 56
D.4 Mechanical vibration and shock capabilities . 56
D.5 Routine tests . 56
D.5.1 Dielectric withstand test at power frequency . 56
D.5.2 Partial discharge extinction voltage test . 56
D.5.3 Capacitance and dissipation factor . 56
Figure 1 – generic overview of PD measuring system and its subsystems . 8
Figure 2 – Cascade of frequency response channels . 9
Figure 3 – Idealized frequency response of a PD pulse at the PD source and at the
machine terminals; frequency response of different PD measuring systems: a) low
frequency range, b) high frequency range, c) very high frequency range . 10
Figure 4 – Measuring object, during normalization . 17
Figure 5 – Arrangement for sensitivity check . 18
Figure 6 – Recommended test procedure with consecutive load and temperature
conditions . 21
Figure 7 – Example of the trend in peak PD activity in three phases over an 18-year
interval using periodic measurements. The data has been filtered to only show the PD
occurring when the generator is operating between 35 to 40.9 MW and from 98 to 108
C 23
Figure 8 – Examples of a PRPD pattern. a) PD pulse activity captured by a 100 MHz
digital oscilloscope during one AC cycle. b) PRPD pattern acquired on the same test
object in (a) over 80 seconds (4800 AC cycles) using a commercial PD detector in the
40 – 350 MHz range. The detector automatically suppresses oscillations from each PD
pulse. C) PD pulse activity captured by a commercial PD detector during one AC cycle.
D) PRPD pattern captured over xyz seconds (n AC cycles) … with colour code for the
pulse number H(n)/s . 24
Figure 9 – Phase to phase PD PRPD plots where the PD is caused by insufficient
spacing between the endwindings of Phases B and C. The activity in A phase is not
PD in A phase, but rather it is capacitively coupled from B and C phases. . 25
Figure B.1 – Example for time domain separation by time of pulse arrival . 36
Figure B.2 – Combined time and frequency domain disturbance separation (time
frequency-map) . 36
Figure B.3 – 3 phase star diagram of multi-channel measurement - a) measured
signals of each single PD in the phases L1, L2, L3 - b) vector sum of the three
measured PD amplitudes within the star diagram – c) visualization of total measured
PD over a longer period of time . 37
Figure C.1 – Phase-earth driven PD - PD predominantly centered on 45° and 225°
after zero crossing of phase-to-earth voltage . 40
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Figure C.2 – PD events and other sources, e.g. non-PD sources, that are not centered
on 45° and 225° after zero crossing of phase-to-earth voltage . 41
Figure C.3 – Example of internal void discharges PRPD pattern, recorded during
laboratory simulation. 43
Figure C.4 – Example of internal delamination PRPD pattern, recorded during
laboratory simulation. 43
Figure C.5 – Example of delamination between conductor and insulation PRPD pattern,
recorded during laboratory simulation . 44
Figure C.6 – Slot partial discharges activity and corresponding PRPD pattern, recorded
during laboratory simulation . 44
Figure C.7 – Corona activity at the S/C and stress grading coating, and corresponding
PRPD pattern, recorded during laboratory simulation . 45
Figure C.8 – Surface tracking activity along the end arm and corresponding PRPD
pattern, recorded during laboratory simulation . 45
Figure C.9 – Surface discharges at end corona protection. a) Insulating tape simulating
a bad electrical connection between conductive slot coating and EPG and the
corresponding PRPD – b) and c) the connection is completely interrupted. . 46
Figure C.10 – Gap type discharge activities and corresponding PRPD patterns,
recorded during laboratory simulations . 47
Figure C.11 – Example of internal void discharges PRPD pattern, recorded on-line . 48
Figure C.12 – Example of internal delamination PRPD pattern, recorded on-line. 48
Figure C.13 – Example of delamination between conductor and insulation PRPD
pattern, recorded on-line . 49
Figure C.14 - PD pattern of phase 2 recorded on-line in April 2012 without any filtering
indicating slot PD . 50
Figure C.15 - Picture of a bar removed for expertise chosen to be the one with the
highest level on phase 2 and close to line side when scanning slots using the TVA
probe in January 2014. . 50
Figure C.16 - PD pattern recorded on-line on phase 2 in September 2016. Max scale is
1 V 50
Figure C.17 – PRPD plot and photo of a stator bar in the same phase of a large air-
cooled turbine generator showing signs of deterioration of the slot conductive coating,
as well deterioration of the interface between the slot conductive coating and the
stress control coating . 51
Figure C.18 – Surface tracking activity along the end arm and corresponding PRPD
pattern, recorded on-line . 51
Figure C.19 – Degradation caused by gap type discharges and corresponding PRPD
patterns, recorded on-line . 52
Figure C.18 – PRPD pattern recorded on-line, illustrating multiple PD sources . 53
Figure C.19 - Three phase PRPD showing phase to phase PD between A and B
phases as well as B and C phases together with a photo showing the as-found PD in
the endwinding area due to inadequate separation between the phases. . 54
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INTERNATIONAL ELECTROTECHNICAL COMMISSION
______________
ROTATING ELECTRICAL MACHINES –
Part 27-2: On-line partial discharge measurements on the stator
winding insulation of rotating electrical machines
FOREWORD
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Technical specifications are subject to review within three years of publication to decide whether
they can be transformed into International Standards.
IEC/IS 60034-27-2, which is an international standard, has been prepared by IEC technical
committee 2: Rotating machinery.
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oSIST prEN IEC 60034-27-2:2022
IEC CDV 60034-27-2 © IEC 2022 – 7 –
The text of this international standard is based on the following documents:
Enquiry draft Report on voting
2/1636/DTS 2/1649/RVC
Full information on the voting for the approval of this international standard can be found in the
report on voting indicated in the above table.
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1 INTRODUCTION
2 Partial Discharge (PD) on-line measurement of rotating electrical machines has gained wide-
3 spread acceptance as it could reveal the presence of localized weak points of the stator insu-
4 lation system and also various arcing and sparking phenomena. Nevertheless, it has emerged
5 from several studies that not only are there many different methods of measurement in exist-
6 ence but also the criteria and methods of analysing and finally assessing the measured data
7 are often very different and not really comparable. Consequently, there is a need to have an
8 International Standard (IS) to give defined guidelines to the users of on-line PD measurements
9 to assess the condition of their insulation systems.
10 On-line PD measurements are recorded with the rotating electrical machine experiencing all of
11 the operating stresses; thermal, electrical, environmental and mechanical. Due to the realistic
12 stress impact on the winding during meas
...
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