IEC-60364-4-44-2007.pdf
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1、 IEC 60364-4-44 Edition 2.0 2007-08 INTERNATIONAL STANDARD NORME INTERNATIONALE Low-voltage electrical installations Part 4-44: Protection for safety Protection against voltage disturbances and electromagnetic disturbances Installations lectriques basse tension Partie 4-44: Protection pour assurer l
2、a scurit Protection contre les perturbations de tension et les perturbations lectromagntiques IEC 60364-4-44:2007 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2007 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized
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15、ctroniques et lectriques. Il contient plus de 20 000 termes et dfinitions en anglais et en franais, ainsi que les termes quivalents dans les langues additionnelles. Egalement appel Vocabulaire Electrotechnique International en ligne. ? Service Clients: www.iec.ch/webstore/custserv/custserv_entry-f.h
16、tm Si vous dsirez nous donner des commentaires sur cette publication ou si vous avez des questions, 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 60364-4-44 Edition 2.0 2007-08 INTERNATIONAL STANDARD NORME INTERNATIONALE Low-vol
17、tage electrical installations Part 4-44: Protection for safety Protection against voltage disturbances and electromagnetic disturbances Installations lectriques basse tension Partie 4-44: Protection pour assurer la scurit Protection contre les perturbations de tension et les perturbations lectromagn
18、tiques INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE XA ICS 91.140.50 PRICE CODE CODE PRIX ISBN 2-8318-9261-9 2 60364-4-44 IEC:2007 CONTENTS FOREWORD.5 INTRODUCTION.7 440.1 Scope.8 440.2 Normative references8 441 (Vacant).9 442 Protection of low-voltage install
19、ations against temporary overvoltages due to earth faults in the high-voltage system and due to faults in the low-voltage system 9 442.1 Scope and object 9 442.1.1 General.9 442.1.2 Symbols10 442.2 Overvoltages in LV-systems during a high-voltage earth fault 11 442.2.1 Magnitude and duration of powe
20、r frequency fault-voltage.12 442.2.2 Magnitude and duration of power frequency stress-voltages.13 442.2.3 Requirements for calculation of limits 14 442.3 Power frequency stress voltage in case of loss of the neutral conductor in a TN and TT system 14 442.4 Power frequency stress voltage in the event
21、 of an earth fault in an IT system with distributed neutral14 442.5 Power frequency stress voltage in the event of short-circuit between a line conductor and the neutral conductor .14 443 Protection against overvoltages of atmospheric origin or due to switching.14 443.1 General 14 443.2 Classificati
22、on of impulse withstand voltages (overvoltage categories) 15 443.2.1 Purpose of classification of impulse withstand voltages (overvoltage categories)15 443.2.2 Relationship between impulse withstand voltages of equipment and overvoltage categories 15 443.3 Arrangements for overvoltage control16 443.
23、3.1 Inherent overvoltage control 16 443.3.2 Protective overvoltage control16 443.4 Required impulse withstand voltage of equipment18 444 Measures against electromagnetic influences.18 444.1 General 18 444.2 (void)19 444.3 Definitions 19 444.4 Mitigation of Electromagnetic Interference (EMI) .20 444.
24、4.1 Sources of EMI20 444.4.2 Measures to reduce EMI21 444.4.3 TN-system 22 444.4.4 TT system.26 444.4.5 IT system 27 444.4.6 Multiple-source supply.28 444.4.7 Transfer of supply .31 444.4.8 Services entering a building.33 444.4.9 Separate buildings.34 444.4.10 Inside buildings .34 444.4.11 Protectiv
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