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: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• 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: 15-Oct-2010
• Completion Date: 22-Jul-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
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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/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 cla
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