BS EN IEC 60071-1:2019
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Insulation co-ordination – Definitions, principles and rules
| Published By | Publication Date | Number of Pages |
| BSI | 2019 | 42 |
IEC 60071-1:2019 is available as IEC 60071-1:2019 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 60071-1:2019 applies to three-phase AC systems having a highest voltage for equipment above 1 kV. It specifies the procedure for the selection of the rated withstand voltages for the phase-to-earth, phase-to-phase and longitudinal insulation of the equipment and the installations of these systems. It also gives the lists of the standard withstand voltages from which the rated withstand voltages are selected. This document describes that the selected withstand voltages are associated with the highest voltage for equipment. This association is for insulation co-ordination purposes only. The requirements for human safety are not covered by this document. Although the principles of this document also apply to transmission line insulation, the values of their withstand voltages can be different from the standard rated withstand voltages. The apparatus committees are responsible for specifying the rated withstand voltages and the test procedures suitable for the relevant equipment taking into consideration the recommendations of this document. NOTE In IEC 60071-2, all rules for insulation co?ordination given in this document are justified in detail, in particular the association of the standard rated withstand voltages with the highest voltage for equipment. When more than one set of standard rated withstand voltages is associated with the same highest voltage for equipment, guidance is provided for the selection of the most suitable set. The main changes from the previous edition are as follows: – all references are updated to current IEC standards, and the bibliography is deleted; – some definitions are clarified in order to avoid overlapping and ensure clear understanding; – letter symbols are changed and corrected in order to keep the consistency with relevant IEC standards; – some titles are changed to clarify understanding (see Clauses A.2, A.3 and Annex B).
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 5 | Annex ZA(normative)Normative references to international publicationswith their corresponding European publications |
| 8 | English CONTENTS |
| 10 | FOREWORD |
| 12 | 1 Scope 2 Normative references |
| 13 | 3 Terms and definitions |
| 20 | 4 Abbreviated terms and symbols 4.1 General 4.2 Subscripts 4.3 Letter symbols |
| 21 | 4.4 Abbreviations 5 Procedure for insulation co-ordination 5.1 General outline of the procedure |
| 22 | 5.2 Determination of the representative voltages and overvoltages (Urp) Figure 1 – Flow chart for the determination of rated or standard insulation level |
| 23 | Table 1 – Classes and shapes of overvoltages, standard voltage shapesand standard withstand voltage tests |
| 24 | 5.3 Determination of the co-ordination withstand voltages (Ucw) 5.4 Determination of the required withstand voltage (Urw) |
| 25 | 5.5 Selection of the rated insulation level |
| 26 | 5.6 List of standard rated short-duration power frequency withstand voltages 5.7 List of standard rated impulse withstand voltages 5.8 Ranges for highest voltage for equipment 5.9 Environmental conditions 5.9.1 Normal environmental conditions 5.9.2 Standard reference atmospheric conditions 5.10 Selection of the standard insulation level |
| 28 | Table 2 – Standard insulation levels for range I (1 kV < Um ≤ 245 kV) |
| 29 | Table 3 – Standard insulation levels for range II (Um > 245 kV) (1 of 2) |
| 30 | 5.11 Background of the standard insulation level 5.11.1 General |
| 31 | 5.11.2 Standard rated switching impulse withstand voltage 5.11.3 Standard rated lightning impulse withstand voltage 6 Requirements for standard withstand voltage tests 6.1 General requirements |
| 32 | 6.2 Standard short-duration power-frequency withstand voltage tests 6.3 Standard impulse withstand voltage tests |
| 33 | 6.4 Alternative test situation 6.5 Phase-to-phase and longitudinal insulation standard withstand voltage tests for equipment in range I 6.5.1 Power-frequency tests |
| 34 | 6.5.2 Phase-to-phase (or longitudinal) insulation lightning impulse tests 6.6 Phase-to-phase and longitudinal insulation standard withstand voltage tests for equipment in range II |
| 35 | Annex A (normative) Clearances in air to assure a specified impulse withstand voltage installation A.1 General |
| 36 | A.2 Lightning impulse Table A.1 – Correlation between standard rated lightning impulse withstand voltages and minimum air clearances |
| 37 | A.3 Switching impulse Table A.2 – Correlation between standard rated switching impulse withstand voltages and minimum phase-to-earth air clearances |
| 38 | Table A.3 – Correlation between standard rated switching impulse withstand voltages and minimum phase-to-phase air clearances |
| 39 | Annex B (informative) Rated insulation levels for highest voltages of equipment, Um, not standardized by IEC Table B.1 – Rated insulation levels for highest voltagesof equipment, Um, not standardized by IEC |
| 40 | Bibliography |
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