IEC 62975:2021 provides procedures and guidelines that are intended for the use and maintenance of natural ester liquid in sealed transformers and other electrical equipment. This document is applicable to natural esters, originally supplied conforming to IEC 62770 and other applicable standards (e.g. ASTM D6871) in transformers, switchgear and electrical apparatus where liquid sampling is practical and where the normal operating conditions specified in the equipment specifications apply. At present, there is a limited amount of information available for electrical equipment other than transformers. This document is also intended to assist the power equipment operator to evaluate the condition of the natural ester and maintain it in a serviceable condition. It also provides a common basis for the preparation of more specific and complete local codes of practice. The document includes recommendations on tests and evaluation procedures and outlines methods for reconditioning and reclaiming the liquid, when necessary.<\/p>\n
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|---|---|---|---|---|---|---|---|
| 7<\/td>\n | English \n CONTENTS <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | INTRODUCTION <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 1 Scope 1.1 General 1.2 Application: new and pre-existing plants 1.3 Framework <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | Figures \n Figure 1 \u2013 Overall framework of this standard <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | Figure 2 \u2013 Typical relations of hardware and software in a computer-based system Figure 3 \u2013 Relations between system failure, random failure and systematic fault <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | 4 Symbols and abbreviations 5 Overall I&C safety life cycle 5.1 General <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | Tables \n Table 1 \u2013 Overview of the overall I&C safety life cycle <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | 5.2 Deriving the I&C requirements from the plant safety design base Figure 4 \u2013 Connections between the overall I&C safety life cycle and the safety life cycles of the individual I&C systems <\/td>\n<\/tr>\n | ||||||
| 35<\/td>\n | 5.3 Output documentation 5.4 Design of the overall I&C architecture and assignment of the I&C functions <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | Table 2 \u2013 Correlation between classes of I&C systems and categories of I&C functions <\/td>\n<\/tr>\n | ||||||
| 41<\/td>\n | 5.5 Overall planning <\/td>\n<\/tr>\n | ||||||
| 46<\/td>\n | 5.6 Output documentation <\/td>\n<\/tr>\n | ||||||
| 47<\/td>\n | 6 System safety life cycle 6.1 General Table 3 \u2013 Overview of the system safety life cycle <\/td>\n<\/tr>\n | ||||||
| 49<\/td>\n | 6.2 Requirements Figure 5 \u2013 System safety life cycle <\/td>\n<\/tr>\n | ||||||
| 62<\/td>\n | 6.3 System planning <\/td>\n<\/tr>\n | ||||||
| 68<\/td>\n | 6.4 Output documentation <\/td>\n<\/tr>\n | ||||||
| 73<\/td>\n | 6.5 System qualification <\/td>\n<\/tr>\n | ||||||
| 77<\/td>\n | 7 Overall integration and commissioning 7.1 General Figure 6 \u2013 Product- and plant-application-specific topics to be addressedin the system qualification plan <\/td>\n<\/tr>\n | ||||||
| 78<\/td>\n | 7.2 Requirements on the objectives to be achieved 7.3 Output documentation 8 Overall operation and maintenance 8.1 General 8.2 Requirements on the objectives to be achieved <\/td>\n<\/tr>\n | ||||||
| 79<\/td>\n | 8.3 Output documentation <\/td>\n<\/tr>\n | ||||||
| 80<\/td>\n | Annex A (informative) \nBasic safety issues in the NPP <\/td>\n<\/tr>\n | ||||||
| 83<\/td>\n | Annex B (informative) \nCategorisation of functions and classification of systems <\/td>\n<\/tr>\n | ||||||
| 84<\/td>\n | Figure B.1 \u2013 Relations between I&C functions and I&C systems <\/td>\n<\/tr>\n | ||||||
| 87<\/td>\n | Table B.1 \u2013 Typical classification of I&C systems <\/td>\n<\/tr>\n | ||||||
| 89<\/td>\n | Table C.1 \u2013 Examples of CCF sensitive in safety groups <\/td>\n<\/tr>\n | ||||||
| 92<\/td>\n | Annex D (informative) Relations of IEC 61508 with IEC 61513 \nand standards of the nuclear application sector <\/td>\n<\/tr>\n | ||||||
| 99<\/td>\n | Annex E (informative) Changes to be performed in later revisions of SC 45A standards \nto adapt to this version of IEC 61513 <\/td>\n<\/tr>\n | ||||||
| 101<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Nuclear power plants. Instrumentation and control important to safety. General requirements for systems<\/b><\/p>\n |