IEC TR 61912-1-2007 Low-voltage switchgear and controlgear - Overcurrent protective devices - Part 1 Application of short-circuit ratings《低压开关装置和控制装置.过电流保护装置.第1部分 短路额定值的应用》.pdf

1、 IEC/TR 61912-1Edition 1.0 2007-08TECHNICAL REPORT RAPPORT TECHNIQUELow-voltage switchgear and controlgear Overcurrent protective devices Part 1: Application of short-circuit ratings Appareillage basse tension Dispositifs de protection contre les surintensits Partie 1: Application des caractristique

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16、stions, visitez le FAQ du Service clients ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC/TR 61912-1Edition 1.0 2007-08TECHNICAL REPORT RAPPORT TECHNIQUELow-voltage switchgear and controlgear Overcurrent protective devices Part 1: Application of short-circuit rati

17、ngs Appareillage basse tension Dispositifs de protection contre les surintensits Partie 1: Application des caractristiques de court-circuit INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE SICS 29.130 PRICE CODECODE PRIXISBN 2-8318-9273-2 2 TR 61912-1 IEC:2007 CON

18、TENTS FOREWORD.4 INTRODUCTION.6 1 Scope.7 2 Normative references .7 3 Alphabetical list of definitions and characteristics .8 4 Principle of application Installation 9 5 Characteristics Low-voltage assemblies (switchboard, distribution board, etc.)9 6 Characteristics Switching devices10 6.1 General

19、10 6.2 Switching devices Self-protection against short-circuit10 6.3 Switching devices Application as SCPD11 6.3.1 Fuse-combination units and fuses as SCPD 11 6.3.2 Circuit-breakers to IEC 60947-2 as SCPD .11 6.3.3 Control and protective switching devices (CPS) according to IEC 60947-6-2 as SCPD12

20、6.3.4 Circuit-breakers according to IEC 60898-1 (MCBs) and residual current operated circuit-breaker with integral overcurrent protection (RCBOs) according to IEC 61009-1 as SCPD 12 7 Examples of the practical application of the product characteristics13 7.1 General .13 7.2 Protection of cables.13 7

21、3 Short-circuit protection for LV assemblies13 7.3.1 Switchgear and controlgear assemblies (switchboard/motor-control centre (MCC)13 7.3.2 Busbar trunking systems (BTS) .13 7.4 Short-circuit protection for contactors and starters 14 7.4.1 General .14 7.4.2 Protected switching device and protected s

22、tarter .14 7.4.3 Control and protective switching device (CPS) according to IEC 60947-6-2 .15 7.5 Short-circuit protection using circuit-breakers for household and similar installations according to IEC 60898-1 (usually known as MCBs) and residual current operated circuit-breakers with integral over

23、current protection (RCBOs) according to IEC 61009-1 .15 Annex A (informative) Interpolation of the suitability of an alternative SCPD for the protection of contactors and starters (substitution)21 Bibliography22 Figure 1 Example of the I2t characteristic of a fuse17 Figure 2 Example of the I2t chara

24、cteristic of a circuit-breaker 17 Figure 3 Example of SCPDs in combination .18 Figure 4 Example of the derivation of a conditional rating from type-test parameters .19 Figure 5a Co-ordination of a motor-starter with a fuse20 TR 61912-1 IEC:2007 3 Figure 5b Co-ordination of a motor-starter with circu

25、it-breaker.20 Figure 5 Illustration of co-ordination between motor-starter and SCPD.20 Table 1 Ratio k between service short-circuit capacity (Ics) and rated short-circuit capacity (Icn) for an MCB according to IEC 60898-1 .16 Table 2 Value of the prospective test current according to the rated oper

26、ational current16 4 TR 61912-1 IEC:2007 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR OVERCURRENT PROTECTIVE DEVICES Part 1: Application of short-circuit ratings FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for stand

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37、ees is to prepare International Standards. However, a technical committee may propose the publication of a technical report when it has collected data of a different kind from that which is normally published as an International Standard, for example “state of the art“. IEC 61912-1, which is a techn

38、ical report, has been prepared by subcommittee 17B: Low-voltage switchgear and controlgear, of IEC technical committee 17: Switchgear and controlgear. This edition cancels and replaces the first edition of IEC 61912, published in 2006, and corrigendum 1 (May 2006). The changes are only editorial. TR

39、 61912-1 IEC:2007 5 The text of this technical report is based on the following documents: Enquiry draft Report on voting 17B/1547/DTR 17B/1564/RVC Full information on the voting for the approval of this technical report can be found in the report on voting indicated in the above table. This publica

40、tion has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all the parts of the IEC 61912 series, under the general title Low-voltage switchgear and controlgear Overcurrent protective devices, can be found on the IEC website. The committee has decided that the contents of thi

41、s publication will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 6 TR 61912-1 IEC

42、2007 INTRODUCTION Low-voltage equipment standards IEC 60947 and IEC 60439 currently include short-circuit ratings for products and assemblies respectively, defined in terms of the ability of the equipment to operate at a level of peak current, an r.m.s. current for a specified time and/or a level o

43、f current conditional upon a short-circuit protective device in series. In practice the correct application of the various short-circuit ratings needs to be fully understood by the circuit designer to avoid leaving a circuit or equipment with inadequate short-circuit protection. It is also useful to

44、 take full advantage of the capability of devices and systems to avoid over-engineering, with the consequent unnecessary additional cost. TR 61912-1 IEC:2007 7 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR OVERCURRENT PROTECTIVE DEVICES Part 1: Application of short-circuit ratings 1 Scope This technical re

45、port, which serves as an application guide for the short-circuit ratings given in IEC standards for low-voltage switchgear and controlgear and assemblies, summarises the definitions of the ratings and provides examples of their application. NOTE This document does not concern itself with household (

46、domestic) installations. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. I

47、EC 60255 (all parts), Electrical relays IEC 60269-1, Low-voltage fuses Part 1: General requirements IEC 60364 (all parts), Low-voltage electrical installations IEC 60439-1, Low-voltage switchgear and controlgear assemblies Part 1: Type-tested and partially type-tested assemblies IEC 60439-2, Low-vol

48、tage switchgear and controlgear assemblies Part 2: Particular requirements for busbar trunking systems (busways) IEC 60898-1, Electrical accessories Circuit-breakers for overcurrent protection for household and similar installations Part 1: Circuit-breakers for a.c. operation IEC 60947-1, Low-voltag

49、e switchgear and controlgear Part 1: General rules IEC 60947-2, Low-voltage switchgear and controlgear Part 2: Circuit-breakers IEC 60947-3, Low-voltage switchgear and controlgear Part 3: Switches, disconnectors, switch-disconnectors and fuse-combination units IEC 60947-4-1, Low-voltage switchgear and controlgear Part 4-1: Contactors and motor-starters Electromechanical