IEC/IEEE 62582-4:2022

IEC/IEEE 62582-4 ®
Edition 2.0 2022-11
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Nuclear power plants – Instrumentation and control important to safety –
Electrical equipment condition monitoring methods –
Part 4: Oxidation induction techniques

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IEC/IEEE 62582-4 ®
Edition 2.0 2022-11
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Nuclear power plants – Instrumentation and control important to safety –
Electrical equipment condition monitoring methods –
Part 4: Oxidation induction techniques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 27.120.20
ISBN 978-2-8322-6032-6
– 2 – IEC/IEEE 62582-4:2022 RLV
© IEC/IEEE 2022
CONTENTS
FOREWORD . 4
INTRODUCTION . 7
1 Scope and object . 10
2 Normative references . 10
3 Terms and definitions . 10
4 Abbreviated terms and acronyms . 11
5 General description . 11
6 Applicability and reproducibility . 11
7 Measurement procedure . 12
7.1 Stabilisation of the polymeric materials . 12
7.2 Sampling. 12
7.2.1 General . 12
7.2.2 Sample requirements . 12
7.2.3 Precautions . 12
7.3 Sample preparation . 13
7.4 Instrumentation . 13
7.5 Calibration . 13
7.6 OIT measurement method . 13
7.6.1 Measurement procedure . 13
7.6.2 Temperature profile . 14
7.6.3 Gas flow . 15
7.6.4 Determining the value of oxidation onset . 15
7.6.5 Reporting . 16
7.7 OITP measurement method . 17
7.7.1 Measurement procedure . 17
7.7.2 Temperature profile . 17
7.7.3 Gas flow . 17
7.7.4 Determining the value of oxidation onset . 18
7.7.5 Reporting . 18
Annex A (informative) Interpretation of thermogram . 20
A.1 Interpretation of OIT thermograms . 20
A.2 Interpretation of OITP thermograms . 23
Annex B (informative) Example of a measurement report from OITP measurements
and OIT . 25
B.1 OITP measurements . 27
B.2 OIT measurements . 29
Annex C (informative) Influence of set temperature on the OIT value . 31
Bibliography . 32

Figure 1 – OIT measurement – Schematic of temperature and gas profile and
corresponding heat flow . 14
Figure 2 – Schematic showing the types of baselines (flat, sloping, endothermic dip,
melting endotherm) observed for OIT and OITP measurements . 15
Figure 3 – Schematic showing definition of onset value for OIT and OITP
measurements . 16

© IEC/IEEE 2022
Figure 4 – Schematic of the temperature for OITP measurements and the
corresponding heat flow . 17
Figure A.1 – Example of an OIT plot with clear baseline and onset . 20
Figure A.2 – Example of OIT plot with multiple onsets. 21
Figure A.3 – Example of OIT plot where the baseline is difficult to define . 22
–1
Figure A.4 – Example of OIT plot where heat flow is too low to use standard 0,1 W∙g
threshold . 22
Figure A.5 – Example of an OITP plot with a well-defined baseline and onset . 23
Figure A.6 – Example of an OITP plot for a semi-crystalline material showing a melting
endotherm prior to the oxidation onset . 24
Figure A.7 – Example of an OITP plot showing an endothermic dip immediately prior to
the oxidation onset . 24
Figure B.1 – Example of test plot .
Figure B.1 – Example of OITP test plot . 28
Figure B.2 – Example of OIT test plot . 30
Figure C.1 – Example of the influence of set temperature on the OIT value . 31

Table B.1 – Example of a measurement report from OITP . 27
Table B.2 – Example of a measurement report from OIT . 29

– 4 – IEC/IEEE 62582-4:2022 RLV
© IEC/IEEE 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
NUCLEAR POWER PLANTS – INSTRUMENTATION AND CONTROL
IMPORTANT TO SAFETY – ELECTRICAL EQUIPMENT
CONDITION MONITORING METHODS –

Part 4: Oxidation induction techniques

FOREWORD
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