This part of IEC 62271 applies to AC high-speed earthing switches (hereafter termed HSES) designed for indoor and outdoor installation and for operation at service frequencies of 50 Hz and 60 Hz on systems having voltages of 550 kV and above. HSESs described in this document are intended to extinguish the secondary arc remaining after clearing faults on transmission lines by the circuit-breakers. For more detailed information on HSESs, refer to Annex A.<\/p>\n
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| 2<\/td>\n | undefined <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | Annex ZA (normative)Normative references to international publicationswith their corresponding European publications <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | English CONTENTS <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 1 Scope 2 Normative references 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | Figure 1 \u2013 Explanation of a multi-phase auto-reclosing scheme <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 4 Normal and special service conditions 5 Ratings Figures <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 6 Design and construction Figure 2 \u2013 Timing chart of HSES and circuit-breakers <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | Tables Table 1 \u2013 Nameplate information <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 7 Type tests <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | Table 2 \u2013 Standard values of rated induced currents and voltages <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 8 Routine tests 9 Guide to the selection of HSESs (informative) 10 Information to be given with enquiries, tenders and orders (informative) 11 Transport, storage, installation, operating instructions and maintenance <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 12 Safety <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | Annex A (informative) Background information on the use of HSESs <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | Figure A.1 \u2013 Single-line diagram of a power system Figure A.2 \u2013 Timing chart of the HSESs in relation to the transmission line circuit-breakers <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | Figure A.3 \u2013 Typical timing chart showing the time between fault initiation and a successful re-close of the transmission line circuit-breakers <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | Table A.1 \u2013 Comparison of earthing switches <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | Table A.2 \u2013 Comparison of a four-legged reactor and HSES <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | Annex B (informative) Induced current and voltage conditions for other cases <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | Figure B.1 \u2013 System condition to explain successive fault Figure B.2 \u2013 Example of waveforms of delayed current zero phenomena <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | Table B.1 \u2013 Preferred values for single-phase earth fault with delayed current zero phenomena in the presence of a successive fault <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | Figure B.3 \u2013 Typical test circuit for electromagnetic coupling test-duty of a HSES with delayed current zero crossings Figure B.4 \u2013 Typical test circuit for electrostatic coupling test-duty of HSES with delayed current zero crossings <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | Table B.2 \u2013 Preferred values for multi-phase earth faults in a double-circuit system Table B.3 \u2013 Preferred values for covering the cases of categories 0 and 1 <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" High-voltage switchgear and controlgear – Alternating current high-speed earthing switches for secondary arc extinction on transmission lines<\/b><\/p>\n |