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BS EN IEC 60071-11:2022:2023 Edition

BS EN IEC 60071-11:2022:2023 Edition

$145.44

Insulation co-ordination – Definitions, principles and rules for HVDC system

Published By Publication Date Number of Pages
BSI 2023 44
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PDF Pages PDF Title
2 undefined
7 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
9 English
CONTENTS
11 FOREWORD
13 INTRODUCTION
14 1 Scope
2 Normative references
15 3 Terms and definitions
16 Tables
Table 1 – Classes and shapes of overvoltages, standard voltage shapesand standard withstand voltage tests
20 4 Symbols and abbreviations
4.1 General
21 4.2 Subscripts
4.3 Letter symbols
22 4.4 Abbreviations
5 Principles of insulation co-ordination
5.1 General
5.2 Essential differences between AC and DC systems
23 5.3 Insulation co-ordination procedure
5.4 Differences of withstand voltage selection in AC and DC systems
Table 2 – Comparison of the insulation co-ordination procedure of AC and DC systems
24 Figures
Figure 1 – Comparison of the selection between withstand voltagesfor AC equipment and for HVDC converter station equipment
25 6 Design procedure of insulation co-ordination
6.1 General
6.2 Arrester characteristics
6.3 Insulation characteristics
6.4 Determination of the representative overvoltages (Urp)
26 6.5 Determination of the co-ordination withstand voltages (Ucw)
6.6 Determination of the required withstand voltages (Urw)
27 Table 3 – Indicative values of ratios of required impulsewithstand voltage to impulse protective level
28 6.7 Determination of the specified withstand voltage (Uw)
7 Requirements for withstand voltage tests
8 Creepage distances
8.1 General
29 8.2 Base voltage for creepage distance
8.3 Creepage distance for outdoor insulation under DC voltage
8.4 Creepage distance for indoor insulation under DC or mixed voltage
8.5 Creepage distance of AC insulators
30 9 Clearances in air
31 Annex A (informative)Typical HVDC converter station schemes
32 Figure A.1 – Possible arrester locations in one pole of bipoleLCC converter station with 12-pulse converters in series
33 Figure A.2 – Possible arrester locations in one pole of bipolar of VSC converter stations
Figure A.3 – Possible arrester locations in symmetricalmonopole VSC converter stations
34 Table A.1 – Symbol description
35 Annex B (informative)Example of air clearances calculation
B.1 Introductory remarks
B.2 Calculated minimum air clearance for switching impulse stress
B.2.1 General
36 B.2.2 Example calculation
B.3 Calculated minimum air clearance for lightning impulse stress
B.3.1 General
37 B.3.2 Example calculation
38 Annex C (normative)Example of typical DC voltages with possible insulationlevels and corresponding air clearances
C.1 Introductory remarks
C.2 List of typical DC voltagesand possible insulation levels
C.3 Example of presumed switching impulse insulation levels and minimum air clearances
39 Table C.1 – Typical DC voltages and switching/lightning impulse withstand voltage
40 C.4 Example of presumed lightning impulse insulation levels and minimum air clearances
C.5 Possible/Presumed specified DC withstand voltages
C.5.1 General
Table C.2 – Correlation between presumed rated switching impulse withstandvoltages and minimum phase-to-earth air clearances
41 C.5.2 Specified DC withstand voltages
C.5.3 List of specified power frequency withstand voltages
Table C.3 – Correlation between presumed rated lightning impulse withstandvoltages and minimum phase-to-earth air clearances
42 Annex D (informative)Typical arrester characteristics
Figure D.1 – Typical arrester V-I characteristics
43 Annex E (informative)The Correlation of clauses between IEC 60071-11 and IEC 60071-5:2014
44 Bibliography

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