IEC TS 62332-1:2011

IEC/TS 62332-1 ®
Edition 2.0 2011-03
TECHNICAL
SPECIFICATION
Electrical insulation systems (EIS) – Thermal evaluation of combined liquid and
solid components –
Part 1: General requirements
IEC/TS 62332-1:2011(E)
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IEC/TS 62332-1 ®
Edition 2.0 2011-03
TECHNICAL
SPECIFICATION
Electrical insulation systems (EIS) – Thermal evaluation of combined liquid and
solid components –
Part 1: General requirements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
R
ICS 29.080.30 ISBN 978-2-88912-404-6

– 2 – TS 62332-1  IEC:2011(E)
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Thermal ageing test apparatus . 10
4.1 General description . 10
4.2 Construction of the test apparatus . 10
4.2.1 Ageing cells . 10
4.2.2 Immersion heaters . 11
4.2.3 Power supply . 11
4.2.4 Control circuit system . 11
4.2.5 Gas blanketing system . 11
4.2.6 Safety system . 12
4.3 Monitoring and data collection . 12
5 Construction of the test object . 12
5.1 General . 12
5.2 Determination of component volumes . 12
5.3 Test object . 12
5.3.1 General . 12
5.3.2 Conductor assembly . 13
5.3.3 Liquid component . 13
5.3.4 Other components . 14
6 Test procedures . 14
6.1 General . 14
6.2 Preparation of the test objects . 14
6.2.1 General . 14
6.2.2 Reference test object. 14
6.2.3 Candidate test object . 15
6.3 Diagnostic tests . 15
6.3.1 General . 15
6.3.2 Solid insulation . 15
6.3.3 Liquid insulation . 16
6.4 Thermal ageing . 16
6.4.1 Recommended solid-component ageing temperatures . 16
6.4.2 Recommended liquid ageing temperatures . 16
6.4.3 Reference EIS ageing temperatures . 16
6.4.4 Ageing procedures of the candidate EIS . 17
6.5 End-point testing . 17
7 Analysis of data . 17
7.1 End-point criteria . 17
7.1.1 General . 17
7.1.2 End-of-life of the liquid component . 17
7.1.3 End-of-life of the solid component . 18
7.1.4 Extrapolation of data . 18
7.2 Report . 18

TS 62332-1  IEC:2011(E) – 3 –
Annex A (informative) Component volume ratio spreadsheet example . 19
Bibliography . 20

Figure 1 – Ageing cell cross-section . 11
Figure 2 – Example of an insulation package for a transformer winding . 13

Table 1 – Recommended ageing temperatures and periods for expected thermal class . 16
Table A.1 – Examples of component volume ratio calculations . 19

– 4 – TS 62332-1  IEC:2011(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
ELECTRICAL INSULATION SYSTEMS (EIS) –
THERMAL EVALUATION OF COMBINED LIQUID
AND SOLID COMPONENTS –
Part 1: General requirements
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 62332-1, which is a technical specification, has been prepared by IEC technical
committee 112: Evaluation and qualification of electrical insulating materials and systems.

TS 62332-1  IEC:2011(E) – 5 –
This second edition cancels and replaces the first edition, published in 2005, and constitutes
editorial and technical revisions.
The following significant technical changes with respect to the previous edition have been
made:
Modifications have been made to the technical specification based on an extensive test series
conducted using this methodology based on the first edition. This included updating expected
times and temperatures to use in order to get useful results, as well as making the range of
equipment covered more broad. The method can now cover electrotechnical devices using
different sealing systems, as well as devices using enamel covered wires
The text of this technical specification is based on the following documents:
Enquiry draft Report on voting
112/160/DTS 112/168/RVC
Full information on the voting for the approval of this technical specification can be
...