1、 IEC/TR 61912-2Edition 1.0 2009-05TECHNICAL REPORT Low-voltage switchgear and controlgear Over-current protective devices Part 2:Selectivity under over-current conditions IEC/TR 61912-2:2009(E)LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY B
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10、mail:csciec.ch Tel.:+41 22 919 02 11 Fax:+41 22 919 03 00 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.IEC/TR 61912-2Edition 1.0 2009-05TECHNICAL REPORT Low-voltage switchgear and controlgear Over-current protective devices Part 2:S
11、electivity under over-current conditions INTERNATIONAL ELECTROTECHNICAL COMMISSION VICS 29.130 PRICE CODEISBN 2-8318-1042-0 Registered trademark of the International Electrotechnical Commission LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY
12、BUREAU.2 TR 61912-2 IEC:2009(E)CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.7 2 Normative references.7 3 Terms,definitions and abbreviated terms.8 3.1 Alphabetical index of terms.8 3.2 Terms and definitions.9 3.3 Abbreviated terms.10 4 Scope of selectivity requirements.11 4.1 General.11 4.2 Motor prot
13、ection circuit-breaker/Manual motor starter.12 5 Selectivity determination.12 5.1 Circuit-breaker as UD.12 5.1.1 Selectivity between circuit-breakers.12 5.1.2 Selectivity between a circuit-breaker(UD)and a fuse to IEC 60269-1(DD).15 5.1.3 CB/CPS Selectivity between a circuit-breaker to IEC 60947-2(U
14、D)and a CPS to IEC 60947-6-2(DD).16 5.1.4 Circuit-breaker/MOR Selectivity between a circuit-breaker(UD)and a motor protection overload relay to IEC 60947-4-1 or IEC 60947-4-2(DD).17 5.2 Fuse(s)to IEC 60269-1 as UD.18 5.2.1 Fuse/circuit-breaker Selectivity between a fuse to IEC 60269-1(UD)and a circu
15、it-breaker(DD).18 5.2.2 FU/FU Selectivity between fuses to IEC 60269-1(UD and DD).20 5.2.3 FU/CPS Selectivity between fuse(s)to IEC 60269-1(UD)and a CPS to IEC 60947-6-2(DD).21 5.2.4 FU/MOR Selectivity between fuse(s)to IEC 60269-1(UD)and a motor overload protection relay to IEC 60947-4-1 or IEC 609
16、47-4-2(DD).21 6 Residual current devices(RCDs).21 6.1 General.21 6.2 Selectivity RCD/RCD.22 6.2.1 Selectivity between RCDs in the case of earth-leakage current.22 6.2.2 Selectivity between RCDs in the case of earth-fault(ground-fault)current.23 7 Zone Selective Interlocking(ZSI).24 7.1 General.24 7.2 Operating principle.24 7.3 Example.25 8 Over-current protection relay(OCR)Single input energizing quantity measuring relays with dependent or independent time.26 Annex A(informative)Examples of sele
