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BSI PD IEC TR 61244-4:2019

BSI PD IEC TR 61244-4:2019

$167.15

Determination of long-term radiation ageing in polymers – Effects of different temperatures and dose rates under radiation condition

Published By Publication Date Number of Pages
BSI 2019 36
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This part of IEC 61244 provides general guidance for the evaluation/verification of electrical insulation materials (EIM) and electrical insulation systems (EIS) intended to be used in types of equipment exposed to ionizing radiation. Beside sensors, actuators/motors as well as plugs and terminals, cables are a well-known typical application of those EIM and EIS. Their type spectrum covers low voltage power cables, control cables and instrumentation cables. Because of their comparable simple design, cables are the ideal type of equipment to study EIM and EIS degradation processes. But the results of these studies can be easily transferred to the enumerated types of equipment.

Nonetheless, this document provides a state-of-the art report on qualification/verification procedures used to simulate simultaneous effects of temperature and radiation at varying intensities rather than give detailed test programmes valid for specific test methods.

NOTE 1 Use of this document with specific products can require specification of additional product related procedures.

NOTE 2 Some of the procedures described in this document are emerging technologies. Therefore, specified prerequisites, former experiences as well as boundary conditions can be additionally taken into account.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 CONTENTS
5 FOREWORD
7 INTRODUCTION
8 1 Scope
2 Normative references
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
9 3.2 Abbreviated terms
10 4 Radiation induced degradation mechanisms at standard ambient conditions
4.1 General conventions
11 4.2 Effect of presence of oxygen
4.3 Effect of dose-rate effect-1: Physical aspects
12 4.4 Effect of dose-rate-2: Chemical aspects
4.5 Research on degradation mechanism
Tables
Table 1 – Dose rate conditions which do not cause inhomogeneous degradation
13 4.6 Experiences and acceleration factors
4.7 Low dose-rate tests and LOCA survivability
4.8 Effect of LOCA test environment
14 4.9 Order effects, synergistic effects, and antagonistic effects
4.10 Sequential test conditions equivalent to simultaneous methods
15 4.11 Studies after TMI and later
4.12 Arrhenius law and limitations
16 Table 2 – Ea value according to materials, manufacturers, and grades
18 4.13 Slow degradation behaviour observed in service-aged cables
19 4.14 Inverse temperature effects
4.15 Role of antioxidants
Table 3 – Changes in various properties due to inverse temperature and annealing recovery effects, investigated by several instrumental analyses [111].
20 4.16 Other thermal and radiation environment degradation characteristics
5 Accelerated ageing test methods
5.1 Sequential ageing test
5.1.1 General
21 5.1.2 Sequence of testing and synergistic effects
Table 4 – Typical standard acceleration ageing sequence for qualification
Table 5 – More recent standard acceleration ageing sequence for qualification
22 5.1.3 Guidance on test sequences
5.1.4 Assessment of accelerated ageing
23 5.2 Simultaneous ageing test
24 6 Conclusion
25 Bibliography

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BSI PD IEC TR 61244-4:2019
$167.15