EN IEC 60034-27-1:2018

Rotating electrical machines - Part 27-1: Off-line partial discharge measurements on the winding insulation

This part of IEC 60034 provides a common basis for: - measuring techniques and instruments; - the arrangement of test circuits; - normalization and testing procedures; - noise reduction; - the documentation of test results; - the interpretation of test results, with respect to partial discharge off-line measurements on the winding insulation of rotating electrical machines. The measurement methods described in this document are applicable to stator windings of machines with or without conductive slot coating and to the stator windings of machines made with form wound or random wound windings. In special cases like high voltage rotor field windings, this document is applicable as well. The measurement methods are applicable when testing with alternating sinusoidal voltages from 0,1 Hz up to 400 Hz. Interpretation guidelines are given in this document and are applicable only if all the following requirements are fulfilled: - Measurements performed with power frequency of 50 Hz or 60 Hz, or when testing with power supply within a frequency range of 45 Hz to 65 Hz. - Form wound windings and winding components such as bars and coils. - Winding with conductive slot coating. This is usually valid for machines with voltage rating of 6 kV and higher. For machines with random wound windings, form-wound windings without conductive slot coating, and testing at frequencies differing from power frequencies, the interpretation guidelines are not applicable. The testing procedures for off-line PD-measurements of this document can be used for assessing the uniform quality of manufacturing or/and the trending of these kind of windings as well as converter driven machine windings. NOTE Testing of low voltage machines with so called Type I insulation systems is defined in reference [10]1. Testing procedures for qualification of converter driven high voltage machines with so called Type II insulation systems are dealt with in IEC 60034-18-42 (in addition to the optional electric tests described therein).

Drehende elektrische Maschinen - Teil 27-1: Off-line Teilentladungsmessungen an Ständerwicklungsisolierungen drehender elektrischer Maschinen

Machines électriques tournantes - Partie 27-1: Mesurages à l’arrêt des décharges partielles effectués sur le système d'isolation des enroulements

La présente partie de l’IEC 60034 présente des modalités communes concernant: - les techniques et les appareils de mesure; - la mise en place des circuits d'essai; - les procédures de normalisation et d'essai; - la réduction du bruit; - la documentation des résultats des essais; - l'interprétation des résultats des essais; pour les besoins des mesurages à l’arrêt des décharges partielles dans les systèmes d'isolation des enroulements des machines électriques tournantes. Les méthodes de mesure décrites dans le présent document s’appliquent aux enroulements statoriques des machines avec ou sans revêtement d'encoches conducteur et aux enroulements statoriques des machines constitués avec des enroulements préformés ou des enroulements en vrac. Le présent document s’applique également dans des cas particuliers tels que des enroulements d’excitation rotorique haute tension. Les méthodes de mesure s’appliquent pour des essais effectués avec des tensions sinusoïdales alternatives comprises entre 0,1 Hz et 400 Hz. Le présent document fournit des lignes directrices d'interprétation qui s’appliquent uniquement si toutes les exigences suivantes sont satisfaites: - Mesurages effectués avec une fréquence industrielle de 50 Hz ou 60 Hz, ou lorsque les essais sont effectués avec une source d’alimentation comprise dans une plage de fréquences de 45 Hz à 65 Hz. - Enroulements préformés et composants d’enroulement tels que des barres et des bobines. - Enroulement avec un revêtement d'encoches conducteur. Ces exigences sont généralement valables pour les machines dont la tension assignée est supérieure ou égale à 6 kV. Les lignes directrices d'interprétation ne s’appliquent pas aux machines avec enroulements en vrac et enroulements préformés sans revêtement d'encoches conducteur. Elles ne s’appliquent pas non plus aux essais effectués à des fréquences différentes des fréquences industrielles. Les procédures d’essai applicables aux mesurages à l’arrêt des DP spécifiés dans le présent document peuvent être utilisées pour évaluer la qualité uniforme de fabrication et/ou l’évolution de ces types d’enroulements, ainsi que les enroulements de machines entraînées par convertisseur. NOTE L’essai des machines basse tension avec le système d’isolation appelé système de type 1 est défini à la référence [10]1. L’IEC 60034-18-42 traite des procédures d’essai de qualification des machines haute tension entraînées par convertisseur avec des systèmes d'isolation appelés systèmes de type II (outre les essais électriques facultatifs qui y sont décrits).

Električni rotacijski stroji - 27-1. del: Meritve delne praznitve izolacije statorskega navitja odklopljenih električnih rotacijskih strojev (IEC 60034-27-1:2017)

Ta del standarda IEC 60034 podaja skupno podlago za:
– merilne tehnike in instrumente;
– razporeditev preskusnih tokokrogov;
– postopke normalizacije in preskušanja;
– zmanjšanje hrupa;
– beleženje rezultatov preskusov;
– tolmačenje rezultatov preskusov
v povezavi z meritvami delne praznitve izolacije navitja odklopljenih električnih rotacijskih strojev.
Merilne metode, opisane v tem dokumentu, se uporabljajo za statorska navitja strojev s prevodno prevleko ali brez nje ter statorska navitja strojev, izdelanih iz predhodno oblikovanih ali naključnih navitij. Ta dokument se uporablja tudi v posebnih primerih, npr. za visokonapetostna rotorska navitja. Merilne metode se uporabljajo pri preskušanju z izmeničnimi sinusoidnimi napetostmi od 0,1 Hz do vključno 400 Hz.
V tem dokumentu so podane razlagalne smernice, ki se uporabljajo samo, če so izpolnjene naslednje zahteve:
– Meritve, izvedene z omrežno frekvenco 50 Hz ali 60 Hz, oziroma pri preskušanju z napajanjem v frekvenčnem območju med 45 Hz in 65 Hz.
– Predhodno oblikovana navitja in ovojne komponente, kot so palice in tuljave.
– Navitje s prevodno prevleko. To običajno velja za stroje z nazivno napetostjo, višjo od 6 kV.
Razlagalne smernice se ne uporabljajo za stroje z naključnimi navitji, stroje s predhodno oblikovanimi navitji brez prevodne prevleke in preskušanje pri frekvencah, ki se razlikujejo od omrežnih frekvenc. Preskusne postopke za meritve delne praznitve odklopljenih strojev v tem dokumentu je mogoče uporabljati za ocenjevanje enotne kakovosti proizvodnje in/ali določanje trendov teh vrst navitij ter navitij strojev, ki jih poganjajo pretvorniki.
OPOMBA: Preskušanje nizkonapetostnih strojev s t. i. izolacijskimi sistemi tipa I je opredeljeno v sklicu [10]1.
Preskusni postopki za vrednotenje visokonapetostnih strojev, ki jih poganjajo pretvorniki, s t. i. izolacijskimi sistemi tipa II so obravnavani v standardu IEC 60034-18-42 (skupaj z opisi izbirnih električnih preskusov).

General Information

• Status: Published
• Publication Date: 28-Jun-2018
• Withdrawal Date: 28-Jun-2021
• ICS: 29.160.01 - Rotating machinery in general
• Technical Committee: CLC/TC 2 - Rotating machinery
• Drafting Committee: IEC/TC 2 - IEC_TC_2
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 29-Jun-2018
• Completion Date: 29-Jun-2018
• Ref Project: SIST EN IEC 60034-27-1:2018 - Rotating electrical machines - Part 27-1: Off-line partial discharge measurements on the stator winding insulation of rotating electrical machines (IEC 60034-27-1:2017)

Relations

• Replaces: CLC/TS 60034-27:2011 - Rotating electrical machines - Part 27: Off-line partial discharge measurements on the stator winding insulation of rotating electrical machines
• Effective Date: 03-Jul-2018

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 60034-27-1:2018
01-oktober-2018
1DGRPHãþD
SIST-TS CLC/TS 60034-27:2011
(OHNWULþQLURWDFLMVNLVWURMLGHO0HULWYHGHOQHSUD]QLWYHL]RODFLMHVWDWRUVNHJD
QDYLWMDRGNORSOMHQLKHOHNWULþQLKURWDFLMVNLKVWURMHY,(&
Rotating electrical machines - Part 27-1: Off-line partial discharge measurements on the
stator winding insulation of rotating electrical machines (IEC 60034-27-1:2017)
Drehende elektrische Maschinen - Teil 27-1: Off-line Teilentladungsmessungen an
Ständerwicklungsisolierungen drehender elektrischer Maschinen (IEC 60034-27-1:2017)
Machines électriques tournantes - Partie 27-1: Mesures à l'arrêt des décharges partielles
effectuées sur le système d'isolation des enroulements statoriques des machines
électriques tournantes (IEC 60034-27-1:2017)
Ta slovenski standard je istoveten z: EN IEC 60034-27-1:2018
ICS:
29.160.01 Rotacijski stroji na splošno Rotating machinery in
general
SIST EN 60034-27-1:2018 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

SIST EN 60034-27-1:2018
SIST EN 60034-27-1:2018
EUROPEAN STANDARD EN IEC 60034-27-1

NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2018
ICS 29.160.01 Supersedes CLC/TS 60034-27:2011
English Version
Rotating electrical machines - Part 27-1: Off-line partial
discharge measurements on the stator winding insulation of
rotating electrical machines
(IEC 60034-27-1:2017)
Machines électriques tournantes - Partie 27-1: Mesures à Drehende elektrische Maschinen - Teil 27-1: Off-line
l'arrêt des décharges partielles effectuées sur le système Teilentladungsmessungen an Ständerwicklungsisolierungen
d'isolation des enroulements statoriques des machines drehender elektrischer Maschinen
électriques tournantes (IEC 60034-27-1:2017)
(IEC 60034-27-1:2017)
This European Standard was approved by CENELEC on 2018-01-17. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60034-27-1:2018 E

SIST EN 60034-27-1:2018
European foreword
The text of document 2/1877/FDIS, future edition 1 of IEC 60034-27-1:2017, prepared by IEC/TC 2
"Rotating machinery" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC
as EN IEC 60034-27-1:2018.
The following dates are fixed:
(dop) 2018-12-29
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2021-06-29
standards conflicting with the
document have to be withdrawn
This document supersedes CEN/TS 60034-27:2011.

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 60034-27-1:2017 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:

IEC 60034-18-41 NOTE Harmonized as EN 60034-18-41 (not modified).
SIST EN 60034-27-1:2018
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  When an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60034-18-32 -  Rotating electrical machines -- Part 18-32: EN 60034-18-32 -
Functional evaluation of insulation systems
- Test procedures for form-wound windings
- Evaluation of electrical endurance
IEC 60034-18-42 -  Rotating electrical machines - Part 18-42: EN 60034-18-42 -
Partial discharge resistant electrical
insulation systems (Type II) used in
rotating electrical machines fed from
voltage converters - Qualification tests
IEC 60034-27-4 -  Rotating electrical machines - Part 27-4: EN IEC 60034-27-4 -
Measurement of insulation resistance and
polarization index of winding insulation of
rotating electrical machines
IEC 60060-1 -  High-voltage test techniques - Part 1: EN 60060-1 -
General definitions and test requirements
IEC 60060-2 -  High-voltage test techniques - Part 2: EN 60060-2 -
Measuring systems
IEC 60270 2000 High-voltage test techniques - Partial EN 60270 2001
discharge measurements
+ A1 2015  + A1 2016
IEC/TS 60034-27-2 -  Rotating electrical machines - Part 27-2: - -
On-line partial discharge measurements on
the stator winding insulation of rotating
electrical machines
SIST EN 60034-27-1:2018
SIST EN 60034-27-1:2018
IEC 60034-27-1 ®
Edition 1.0 2017-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Rotating electrical machines –

Part 27-1: Off-line partial discharge measurements on the winding insulation

Machines électriques tournantes –

Partie 27-1: Mesurages à l’arrêt des décharges partielles effectués sur le

système d'isolation des enroulements

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.160.01 ISBN 978-2-8322-5104-1

SIST EN 60034-27-1:2018
– 2 – IEC 60034-27-1:2017 © IEC 2017

CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 10
4 Nature of PD in rotating machines . 12
4.1 Basics of PD . 12
4.2 Types of PD in rotating machines . 13
4.2.1 General . 13
4.2.2 Internal discharges . 13
4.2.3 Slot discharges . 13
4.2.4 End-winding gap and surface discharges . 14
4.2.5 Foreign conductive materials discharges . 14
4.3 Pulse propagation in windings . 14
5 Measuring technologies and instrumentation . 15
5.1 General . 15
5.2 Influence of frequency response of measuring system . 15
5.3 Effects of PD coupling units . 16
5.4 Effect of the measuring instrument . 17
6 Visualization of measurements . 17
6.1 General . 17
6.2 Minimum scope of PD data presentation . 17
6.3 Additional means of PD data representation. 18
6.3.1 General . 18
6.3.2 Partial discharge pattern . 19
7 Test circuits . 19
7.1 General . 19
7.2 Individual winding components. 20
7.3 Complete windings . 21
7.3.1 General . 21
7.3.2 Standard measurements (SX.X) . 22
7.3.3 Optional, extended measurements (EX.X) . 23
7.3.4 Using integrated test equipment (IX.X) . 24
8 Normalization of measurements . 25
8.1 General . 25
8.2 Individual winding components. 26
8.3 Complete windings . 26
9 Test procedures . 28
9.1 Acquiring PD measurements on windings and winding components . 28
9.1.1 General . 28
9.1.2 Test equipment and safety requirements . 28
9.1.3 Preparation of test objects . 28
9.1.4 Conditioning . 29
9.1.5 Test voltages . 29
9.1.6 PD test procedure . 30

SIST EN 60034-27-1:2018
IEC 60034-27-1:2017 © IEC 2017 – 3 –
9.2 Identifying and locating the source of partial discharges . 32
10 Interpretation of test results . 32
10.1 General . 32
10.2 Interpretation of PD magnitude, inception and extinction voltage. 33
10.2.1 Basic interpretation . 33
10.2.2 Trend in PD in a machine over time . 34
10.2.3 Comparisons between winding components or between windings . 34
10.3 PD pattern recognition . 35
10.3.1 General . 35
10.3.2 Basic interpretation . 35
11 Test report . 37
Annex A (informative) Influence parameters of test frequency to testing procedure . 39
Annex B (
...

SLOVENSKI STANDARD
01-oktober-2018
Nadomešča:
SIST-TS CLC/TS 60034-27:2011
Električni rotacijski stroji - 27-1. del: Meritve delne praznitve izolacije statorskega
navitja odklopljenih električnih rotacijskih strojev (IEC 60034-27-1:2017)
Rotating electrical machines - Part 27-1: Off-line partial discharge measurements on the
stator winding insulation of rotating electrical machines (IEC 60034-27-1:2017)
Drehende elektrische Maschinen - Teil 27-1: Off-line Teilentladungsmessungen an
Ständerwicklungsisolierungen drehender elektrischer Maschinen (IEC 60034-27-1:2017)
Machines électriques tournantes - Partie 27-1: Mesures à l'arrêt des décharges partielles
effectuées sur le système d'isolation des enroulements statoriques des machines
électriques tournantes (IEC 60034-27-1:2017)
Ta slovenski standard je istoveten z: EN IEC 60034-27-1:2018
ICS:
29.160.01 Rotacijski stroji na splošno Rotating machinery in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60034-27-1

NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2018
ICS 29.160.01 Supersedes CLC/TS 60034-27:2011
English Version
Rotating electrical machines - Part 27-1: Off-line partial
discharge measurements on the stator winding insulation of
rotating electrical machines
(IEC 60034-27-1:2017)
Machines électriques tournantes - Partie 27-1: Mesures à Drehende elektrische Maschinen - Teil 27-1: Off-line
l'arrêt des décharges partielles effectuées sur le système Teilentladungsmessungen an Ständerwicklungsisolierungen
d'isolation des enroulements statoriques des machines drehender elektrischer Maschinen
électriques tournantes (IEC 60034-27-1:2017)
(IEC 60034-27-1:2017)
This European Standard was approved by CENELEC on 2018-01-17. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60034-27-1:2018 E

European foreword
The text of document 2/1877/FDIS, future edition 1 of IEC 60034-27-1:2017, prepared by IEC/TC 2
"Rotating machinery" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC
as EN IEC 60034-27-1:2018.
The following dates are fixed:
(dop) 2018-12-29
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2021-06-29
standards conflicting with the
document have to be withdrawn
This document supersedes CEN/TS 60034-27:2011.

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 60034-27-1:2017 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:

IEC 60034-18-41 NOTE Harmonized as EN 60034-18-41 (not modified).
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  When an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60034-18-32 -  Rotating electrical machines -- Part 18-32: EN 60034-18-32 -
Functional evaluation of insulation systems
- Test procedures for form-wound windings
- Evaluation of electrical endurance
IEC 60034-18-42 -  Rotating electrical machines - Part 18-42: EN 60034-18-42 -
Partial discharge resistant electrical
insulation systems (Type II) used in
rotating electrical machines fed from
voltage converters - Qualification tests
IEC 60034-27-4 -  Rotating electrical machines - Part 27-4: EN IEC 60034-27-4 -
Measurement of insulation resistance and
polarization index of winding insulation of
rotating electrical machines
IEC 60060-1 -  High-voltage test techniques - Part 1: EN 60060-1 -
General definitions and test requirements
IEC 60060-2 -  High-voltage test techniques - Part 2: EN 60060-2 -
Measuring systems
IEC 60270 2000 High-voltage test techniques - Partial EN 60270 2001
discharge measurements
+ A1 2015  + A1 2016
IEC/TS 60034-27-2 -  Rotating electrical machines - Part 27-2: - -
On-line partial discharge measurements on
the stator winding insulation of rotating
electrical machines
IEC 60034-27-1 ®
Edition 1.0 2017-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Rotating electrical machines –

Part 27-1: Off-line partial discharge measurements on the winding insulation

Machines électriques tournantes –

Partie 27-1: Mesurages à l’arrêt des décharges partielles effectués sur le

système d'isolation des enroulements

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.160.01 ISBN 978-2-8322-5104-1

– 2 – IEC 60034-27-1:2017 © IEC 2017

CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 10
4 Nature of PD in rotating machines . 12
4.1 Basics of PD . 12
4.2 Types of PD in rotating machines . 13
4.2.1 General . 13
4.2.2 Internal discharges . 13
4.2.3 Slot discharges . 13
4.2.4 End-winding gap and surface discharges . 14
4.2.5 Foreign conductive materials discharges . 14
4.3 Pulse propagation in windings . 14
5 Measuring technologies and instrumentation . 15
5.1 General . 15
5.2 Influence of frequency response of measuring system . 15
5.3 Effects of PD coupling units . 16
5.4 Effect of the measuring instrument . 17
6 Visualization of measurements . 17
6.1 General . 17
6.2 Minimum scope of PD data presentation . 17
6.3 Additional means of PD data representation. 18
6.3.1 General . 18
6.3.2 Partial discharge pattern . 19
7 Test circuits . 19
7.1 General . 19
7.2 Individual winding components. 20
7.3 Complete windings . 21
7.3.1 General . 21
7.3.2 Standard measurements (SX.X) . 22
7.3.3 Optional, extended measurements (EX.X) . 23
7.3.4 Using integrated test equipment (IX.X) . 24
8 Normalization of measurements . 25
8.1 General . 25
8.2 Individual winding components. 26
8.3 Complete windings . 26
9 Test procedures . 28
9.1 Acquiring PD measurements on windings and winding components . 28
9.1.1 General . 28
9.1.2 Test equipment and safety requirements . 28
9.1.3 Preparation of test objects . 28
9.1.4 Conditioning . 29
9.1.5 Test voltages . 29
9.1.6 PD test procedure . 30

IEC 60034-27-1:2017 © IEC 2017 – 3 –
9.2 Identifying and locating the source of partial discharges . 32
10 Interpretation of test results . 32
10.1 General . 32
10.2 Interpretation of PD magnitude, inception and extinction voltage. 33
10.2.1 Basic interpretation . 33
10.2.2 Trend in PD in a machine over time . 34
10.2.3 Comparisons between winding components or between windings . 34
10.3 PD pattern recognition . 35
10.3.1 General . 35
10.3.2 Basic interpretation . 35
11 Test report . 37
Annex A (informative) Influence parameters of test frequency to testing procedure .
...