This part of IEC 60947 covers low-voltage arc quenching devices, hereinafter referred to as AQDs, which are intended to eliminate arc-faults in low-voltage assemblies (typically low-voltage switchgear and controlgear assemblies in accordance with the IEC 61439 series), by creating a lower impedance current path, to cause the arcing current to transfer to the new current path. This new current path is maintained until a short-circuit protection device (SCPD) interrupts the short-circuit current.<\/p>\n
AQDs are installed in low-voltage assemblies, connected to the main circuit, preferably as close as possible to all primary power sources.<\/p>\n
Their rated voltage does not exceed 1 000 V AC or 1 500 V DC. This document does not cover:<\/p>\n
sensors intended to detect arc-faults;<\/p>\n<\/li>\n
devices intended to trigger the functioning of the arc quenching device;<\/p>\n<\/li>\n
devices intended to interrupt arc-fault current;<\/p>\n<\/li>\n
special requirements for AQDs for use in explosive atmospheres (e.g. ATEX).<\/p>\n<\/li>\n<\/ul>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 2<\/td>\n | National foreword <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | Annex ZA(normative)Normative references to international publicationswith their corresponding European publications <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | English CONTENTS <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | INTRODUCTION <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 1 Scope 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 3 Terms and definitions 4 Classification 4.1 According to the number of operations 4.1.1 Single shot AQD <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 4.1.2 Resettable AQD 4.2 According to the mounting characteristics 4.2.1 Fixed AQD 4.2.2 Withdrawable or plug-in AQD 5 Characteristics 5.1 Rated operational voltage (Ue) 5.2 Rated insulation voltage (Ui) 5.3 Rated impulse withstand voltage (Uimp) 5.4 Rated short-time withstand current (Icw) 5.5 Maximum voltage drop in low-impedance state <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 5.6 Maximum operating time 5.7 Number of operating cycles (of a resettable AQD) 5.8 Maximum permissible temperature of the AQD main circuit terminals 6 Product information 6.1 Nature of information 6.2 Marking <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 6.3 Instructions for installation, operation, maintenance, decommissioning and dismantling 7 Normal service, mounting and transport conditions 8 Constructional and performance requirements 8.1 Constructional requirements Table 1 \u2013 Product information <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 8.2 Performance requirements 8.3 Electromagnetic compatibility (EMC) <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 9 Tests 9.1 Kind of tests 9.2 Compliance with constructional requirements 9.3 Type tests 9.3.1 Performance tests <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 9.3.2 Electromagnetic compatibility tests <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 9.4 Routine tests 9.4.1 Closing operation 9.4.2 Dielectric test <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | Annex\u00a0A (informative)Rationale for defining the maximum voltage drop valuein low-impedance state A.1 Condition for arc extinction <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | A.2 Determination of minimum distance and corresponding voltage drop <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Low-voltage switchgear and controlgear – Active arc-fault mitigation systems. Arc quenching devices<\/b><\/p>\n |