IEC TS 60034-18-33:2010

Rotating electrical machines - Part 18-33: Functional evaluation of insulation systems - Test procedures for form-wound windings - Multifactor evaluation by endurance under simultaneous thermal and electrical stresses

IEC/TS 60034-18-33:2010 describes procedures for evaluation of insulation systems by endurance testing where thermal and electrical stresses are applied simultaneously. The procedures are intended for insulation systems used in a.c. electrical machines using form-wound windings. The test procedures provide a comparison of performance between reference and candidate systems at combinations of voltage and temperature which have been used separately to assess quality in the past and which are chosen to produce failures within a suitable timescale and at stresses within practical limits. The outcome of the test on the candidate insulation system will indicate whether it is better or worse than the reference system with proven service experience. The main changes of this new edition with respect to the previous one are as follows:
- the requirement to investigate the nature of interactions between thermal and electrical stresses has been abandoned;
- the use of single stress acceleration factors has been removed;
- the selection of stress levels has been adjusted and the temperatures are now related to the thermal class temperature of the insulation system;
- the introduction of end-point criteria;
- a simplified method to display results.

General Information

• Status: Published
• Publication Date: 21-Jul-2010
• ICS: 29.160.01 - Rotating machinery in general
• Technical Committee: TC 2 - Rotating machinery
• Drafting Committee: MT 10 - TC 2/MT 10
• Current Stage: PPUB - Publication issued
• Start Date: 22-Jul-2010
• Completion Date: 15-Oct-2010

Standards Content (Sample)

IEC/TS 60034-18-33 ®
Edition 2.0 2010-07
TECHNICAL
SPECIFICATION
Rotating electrical machines –
Part 18-33: Functional evaluation of insulation systems – Test procedures for
form-wound windings – Multifactor evaluation by endurance under simultaneous
thermal and electrical stresses

IEC/TS 60034-18-33:2010(E)
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IEC/TS 60034-18-33 ®
Edition 2.0 2010-07
TECHNICAL
SPECIFICATION
Rotating electrical machines –
Part 18-33: Functional evaluation of insulation systems – Test procedures for
form-wound windings – Multifactor evaluation by endurance under simultaneous
thermal and electrical stresses

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
P
ICS 29.160 ISBN 978-2-88912-066-6
– 2 – TS 60034-18-33 © IEC:2010(E)
CONTENTS
FOREWORD.4
INTRODUCTION.6
1 Scope.7
2 Normative references .7
3 General description of test procedures .8
3.1 Relationship to other standards .8
3.2 Test procedures .8
3.3 Reference insulation system.8
3.4 Characteristics of test procedures .8
3.4.1 General characteristics.8
3.4.2 Ageing sub-cycle .8
3.4.3 Conditioning and diagnostic sub-cycle .8
3.5 Means of heating and definition of thermal stress level.8
3.5.1 Methods of heating .8
3.5.2 Thermal stress level .9
3.5.3 Temperature measuring techniques.9
3.6 Means of electrical ageing.9
3.7 Definition of ageing sub-cycle duration .9
3.8 Reference operating conditions .10
3.8.1 General .10
3.8.2 Reference ageing factors.10
3.8.3 Reference conditioning factors .10
3.8.4 Reference diagnostic factors .10
4 Test objects.10
4.1 Construction of test objects .10
4.1.1 General aspects .10
4.1.2 Considerations on turns and strands in test objects .10
4.2 Number of test specimens .11
4.3 Initial quality control tests.11
4.4 Initial diagnostic tests.11
5 Ageing sub-cycle .11
5.1 Ageing stress levels .11
5.2 Acceleration factors.11
5.3 Duration and number of ageing sub-cycles .12
5.4 Full multifactor testing procedure .12
5.5 Single-point testing procedure .12
6 Conditioning and diagnostic sub-cycle.12
6.1 General .12
6.2 Mechanical tests .13
6.2.1 General mechanical test .13
6.2.2 Shake-table test .13
6.3 Moisture tests.13
6.3.1 General moisture test .13
6.3.2 Moisture test with water immersion.13
6.4 Voltage tests .13
6.5 Other diagnostic tests.14

TS 60034-18-33 © IEC:2010(E) – 3 –
7 End point criteria .14
8 Analyzing the data, reporting and evaluation .14
8.1 Analyzing the data.14
8.2 Reporting .14
8.3 Evaluation .14
Bibliography.15

Table 1 – Guidelines for the selection of stress levels.11

– 4 – TS 60034-18-33 © IEC:2010(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ROTATING ELECTRICAL MACHINES –

Part 18-33: Functional evaluation of insulation systems –
Test procedures for form-wound windings –
Multifactor evaluation by endurance under
simultaneous thermal and electrical stresses

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
The main task of IEC technical committees is to prepare International Standards. In
exceptional circumstances, a technical committee may propose the publication of a technical
specification when
• the required support cannot be obtained for the publication of an International Standard,
despite repeated efforts, or
• the subject is still under technical development or where, for any other reason, there is the
future but no immediate possibility of an agreement on an International Standard.
Technical specifications are subject to review within three years of publication to decide
whether they can be transformed into International Standards.
IEC/TS 60034-18-33, which is a technical specification, has been prepared by IEC technical
committee 2: Rotating machinery.

TS 60034-18-33 © IEC:2010(E) – 5 –
This new edition was originally issued as a technical report in 1995 but has been revised
extensively prior to re-issue as a technical specification. The main changes with respect to
the earlier version of this document are as follows.
a) the requirement to investigate the nature of interactions between thermal and electrical
stresses has been abandoned;
b) the use of single stress acceleration factors has been removed;
c) the selection of stress levels has been adjusted and the temperatures are now related to
the thermal class temperature of the insulation system;
d) the introduction of end-point criteria;
e) a simplified method to display results.
The text of this technical specification is based on the following documents:
Enquiry draft Report on voting
2/1581/DTS 2/1601/RVC
Full information on the voting for the approval of this technical specification can be found in
the report on voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 60034 series, published under the general title Rotating electrical
machines, can be found on the IEC website.
NOTE A table of cross-references of all IEC TC 2 publications can be found on the IEC TC 2 dashboard on the
IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be be
• transformed into an International standard,
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

– 6 – TS 60034-18-33 © IEC:2010(E)
INTRODUCTION
This document is being issued as a technical specification (according to the ISO/IEC
Directives, Part 1, 3.1.1.1) for provisional application in the field of insulation systems for
rotating electrical machines, because there is a need for guidance on how standards in this
field should be used to meet an identified need.
This document is not to be regarded as an International Standard. It is proposed for
provisional application so that information and experience of its use in practice may be
gathered. Comments on the content of this document should be sent to the IEC Central
Office.
Part 18-1 of IEC 60034 presents general guidelines for the evaluation and classification of
insulation systems used in rotating machines.
Part 18-33 deals exclusively with insulation systems for form-wound windings and
concentrates on multifactor functional evaluation under simultaneous thermal and electrical
ageing.
TS 60034-18-33 © IEC:2010(E) – 7 –
ROTATING ELECTRICAL MACHINES –

Part 18-33: Functional evaluation of insulation systems –
Test procedures for form-wound windings –
Multifactor evaluation by endurance under
simultaneous thermal and electrical stresses

1 Scope
This part of IEC 60034-18 describes procedures for evaluation of insulation systems by
endurance testing where thermal and electrical stresses are applied simultaneously. The
procedures are intended for insulation systems used, or proposed to be used, in a.c. electrical
machines using form-wound windings. The test procedures provide a comparison of
performance between reference and candidate systems at combinations of voltage and
temperature which have been used separately to assess quality in the past and which are
chosen to produce failures within a suitable timescale and at stresses within practical limits.
The outcome of the test on the candidate insulation system will indicate whether it is better or
worse than the reference system with proven service experience but will not enable a lifetime
in service to be calculated. The evaluation described in this technical specification does not
include stress grading.
The test procedures in this technical specification are not intended to establish the interaction
between thermal and electrical stress in the ageing process nor endurance lines. If additional
information is required on this interaction or in order to achieve endurance lines, it is
necessary to undertake further tests in which electrical ageing is carried out at constant
temperature and different voltages (IEC 60034-18-32) and thermal ageing is performed at
different temperatures and constant voltage.
2 Normative references
The following referenced documents are indispensable for the application 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.
IEC 60034-15, Rotating electrical machines – Part 15: Impulse voltage withstand levels of
form-wound stator coils for rotating a.c. machines
IEC 60034-18-1:2010, Rotating electrical machines – Part 18-1: Functional evaluation of
insulation systems – General guidelines
IEC/TS 60034-18-42, Rotating electrical machines – Part 18-42: Qualification and acceptance
tests for partial discharge resistant electrical insulation systems (Type II) used in rotating
electrical machines fed from voltage converters
IEC 60085, Electrical insulation –Thermal evaluation and designation
IEC 60505, Evaluation and qualification of electrical insulation systems
IEC 62539, Guide for the statistical analysis of electrical insulation breakdown data

– 8 – TS 60034-18-33 © IEC:2010(E)
3 General description of test procedures
3.1 Relationship to other standards
The principles of IEC 60034-18-1 and IEC 60505 shall be followed, unless the
recommendations or proposals of this part indicate otherwise.
3.2 Test procedures
Testing may be performed either as a full multifactor or as a single point test procedure
involving the application of temperature and voltage simultaneously. The single point test
procedure provides a c
...