1、 IEC/IEEE 62582-4 Edition 1.0 2011-08 INTERNATIONAL STANDARD Nuclear power plants Instrumentation and control important to safety Electrical equipment condition monitoring methods Part 4: Oxidation induction techniques Centrales nuclaires de puissance Instrumentation et contrle-commande importants p
2、our la sret Mthodes de surveillance de ltat des matriels lectriques Partie 4: Techniques dinduction loxydation IEC/IEEE 62582-4:2011NORME INTERNATIONALE THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2011 IEC, Geneva, Switzerland Copyright 2011 IEEE All rights reserved. Unless otherwise specified
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12、3 00 . IEC/IEEE 62582-4 Edition 1.0 2011-08 INTERNATIONAL STANDARD Nuclear power plants Instrumentation and control important to safety Electrical equipment condition monitoring methods Part 4: Oxidation induction techniques Centrales nuclaires de puissance Instrumentation et contrle-commande import
13、ants pour la sret Mthodes de surveillance de ltat des matriels lectriques Partie 4: Techniques dinduction loxydation U ICS 27.120.20 ISBN 978-2-88912-666-8 INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE PRICE CODE CODE PRIX NORME INTERNATIONALE 2 62582-4 g148 IE
14、C/IEEE:2011 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope and object 8 2 Terms and definitions . 8 3 Abbreviations and acronyms . 8 4 General description 9 5 Applicability and reproducibility 9 6 Measurement procedure . 9 6.1 Stabilisation of the polymeric materials 9 6.2 Sampling . 10 6.2.1 Genera
15、l . 10 6.2.2 Sample requirements . 10 6.2.3 Precautions . 10 6.3 Sample preparation . 10 6.4 Instrumentation . 11 6.5 Calibration . 11 6.6 OIT measurement method . 11 6.6.1 Measurement procedure 11 6.6.2 Temperature profile . 12 6.6.3 Gas flow 13 6.6.4 Determining the value of oxidation onset . 13 6
16、.6.5 Reporting 14 6.7 OITP measurement method . 15 6.7.1 Measurement procedure 15 6.7.2 Temperature profile . 16 6.7.3 Gas flow 16 6.7.4 Determining the value of oxidation onset . 16 6.7.5 Reporting 16 Annex A (informative) Interpretation of thermograms . 18 Annex B (informative) Example of a measur
17、ement report from OITP measurements 23 Annex C (informative) Influence of set temperature on the OIT value . 25 Bibliography 26 Figure 1 OIT measurement Schematic of temperature and gas profile and corresponding heat flow 12 Figure 2 Schematic showing the types of baselines (flat, sloping, endotherm
18、ic dip, melting endotherm) observed for OIT and OITP measurements 13 Figure 3 Schematic showing definition of onset value for OIT and OITP measurements 14 Figure 4 Schematic of the temperature for OITP measurements and the corresponding heat flow 15 Figure A.1 Example of an OIT plot with clear basel
19、ine and onset . 18 Figure A.2 Example of OIT plot with multiple onsets 19 Figure A.3 Example of OIT plot where the baseline is difficult to define 20 62582-4 g148 IEC/IEEE:2011 3 Figure A.4 Example of OIT plot where heat flow is too low to use standard 0,1 Wg1threshold 20 Figure A.5 Example of an OI
20、TP plot with a well-defined baseline and onset . 21 Figure A.6 Example of an OITP plot for a semi-crystalline material showing a melting endotherm prior to the oxidation onset 22 Figure A.7 Example of an OITP plot showing an endothermic dip immediately prior to the oxidation onset . 22 Figure C.1 Ex
21、ample of the influence of set temperature on the OIT value 25 4 62582-4 g148 IEC/IEEE:2011 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ NUCLEAR POWER PLANTS INSTRUMENTATION AND CONTROL IMPORTANT TO SAFETY ELECTRICAL EQUIPMENT CONDITION MONITORING METHODS Part 4: Oxidation induction techniques FOREWOR
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41、 Power this is used as the baseline. In some materials, there is a linear change in heat flow before the onset of oxidation. This can also be used as a baseline and is referred to as a sloping baseline. Heatflow(W g117g1) Time (OIT) or temperature (OITP) Flat Sloping Endothermic dip (OITP) Melting e
42、ndotherm (OITP) IEC 1976/11 Figure 2 Schematic showing the types of baselines (flat, sloping, endothermic dip, melting endotherm) observed for OIT and OITP measurements 6.6.4.2 Definition of the threshold and onset time The threshold shall be defined at 0,1 Wg1relative to the baseline. The onset tim
43、e is defined by the intersection of the test curve with the threshold relative to the baseline, as shown in Figure 3. 14 62582-4 g148 IEC/IEEE:2011 Heatflow(W g117g1) Time (OIT) or temperature (OITP) Onset Baseline + threshold Baseline Definition of onset of OIT/OITP IEC 1977/11 Figure 3 Schematic s
44、howing definition of onset value for OIT and OITP measurements Examples of the types of OIT thermogram that are observed in practice are given in Annex A. 6.6.5 Reporting The measurement report shall include the following items. a) Identification of the equipment sampled. This shall include: g120 de
45、tails of the material being sampled, e.g. the generic polymer type, specific formulation numbers; g120 where the sample was taken from, e.g. surface scraping, through thickness slice; g120 for samples taken in plant, location within the plant. b) Pre-history of the equipment sampled. This shall incl
46、ude: g120 time in service, or ageing time for laboratory aged samples; g120 the environmental conditions to which it has been exposed, e.g. temperature, radiation. c) Sampling method, including sample preparation (6.3). d) Place and date of the measurements. e) Instrument used and software version u
47、sed for analysis (6.4). f) Calibration procedure (6.5). g) Type of sample pan used (6.3). h) Oxygen flow rate during test (6.6.3). i) Temperature profile, including ramp rates and hold times (6.6.2). NOTE If the instrument is capable of generating the information, the actual temperature profile shou
48、ld be included. 62582-4 g148 IEC/IEEE:2011 15 j) Baseline type and the rationale for using that specific baseline (6.6.4.1). k) Onset type and the rationale for the selection of the onset in multiple onsets. l) Threshold value used and the rationale if a non-standard value is used (6.6.4.2). m) Numb
49、er of samples measured (6.3). n) Mean value of OIT, and standard deviation, in minutes. o) Examples of the heat flow vs. time plot, particularly if the material does not show a flat baseline with single well-defined onset. 6.7 OITP measurement method 6.7.1 Measurement procedure The measurement procedure is illustrated in Figure 4. It includes the following steps: g120 The sample is heated in the instrument in oxygen at 10 Cmin1g120 The oxidation
