IEC 62870-2015 Electrical installations for lighting and beaconing of aerodromes - Safety secondary circuits in series circuits - General safety requirements《机场照明和信标用电气设备 串联电路中的二次安全电路 通用安全要求》.pdf

1、 IEC 62870 Edition 1.0 2015-09 INTERNATIONAL STANDARD NORME INTERNATIONALE Electrical installations for lighting and beaconing of aerodromes Safety secondary circuits in series circuits General safety requirements Installations lectriques pour lclairage et le balisage des arodromes Circuits secondai

2、res de scurit dans des circuits srie Exigences gnrales de scurit IEC 62870:2015-09(en-fr) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2015 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any fo

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20、Electrical installations for lighting and beaconing of aerodromes Safety secondary circuits in series circuits General safety requirements Installations lectriques pour lclairage et le balisage des arodromes Circuits secondaires de scurit dans des circuits srie Exigences gnrales de scurit INTERNATIO

21、NAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS 29.140.50; 93.120 ISBN 978-2-8322-2896-8 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this public

22、ation from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. colour inside 2 IEC 62870:2015 IEC 2015 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope 6 2 Normative references 6 3 Terms and definitions 7 4 Requirements for the SE

23、LV/PELV supply . 9 4.1 General . 9 4.2 SELV/PELV-safety demarcation line in an AGL series circuit 10 4.3 Environmental conditions 11 4.4 Degree of protection provided by enclosures 11 4.5 Electromagnetic compatibility (EMC) . 11 4.5.1 Limits of electromagnetic emission 11 4.5.2 Limits of immunity 12

24、 4.6 Marking . 12 4.6.1 Marking of the SELV/PELV power supply . 12 4.6.2 Marking at the installation locations . 12 4.7 Protection against electric shock . 12 4.7.1 Basic requirements 12 4.7.2 Protective measure to be applied . 12 4.7.3 Protective separation from the primary series circuit 13 4.7.4

25、Assemblies in the SELV/PELV supply 13 4.7.5 Load of the SELV/PELV supply 13 4.8 Interfaces 14 4.8.1 Supply unit 14 4.8.2 Connectors 14 5 Testing 14 5.1 Type tests . 14 5.2 Routine tests. 14 Annex A (informative) System design selection 15 Bibliography 16 Figure 1 Safety demarcation line in a SELV sy

26、stem . 10 Figure 2 Safety demarcation line in a PELV system . 11 Table A.1 Comparison of characteristics of PELV and SELV 15 IEC 62870:2015 IEC 2015 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTRICAL INSTALLATIONS FOR LIGHTING AND BEACONING OF AERODROMES SAFETY SECONDARY CIRCUITS IN SERIES CIR

27、CUITS GENERAL SAFETY REQUIREMENTS FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions

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37、 Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 62870 has been prepared by IEC technical committee 97: Electrical

38、installations for lighting and beaconing of aerodromes. The text of this standard is based on the following documents: FDIS Report on voting 97/167/FDIS 97/169/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This

39、 publication has been drafted in accordance with the ISO/IEC Directives, Part 2. 4 IEC 62870:2015 IEC 2015 The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to

40、the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. IMPORTANT The colour inside logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding

41、 of its contents. Users should therefore print this document using a colour printer. IEC 62870:2015 IEC 2015 5 INTRODUCTION With a few exceptions, aeronautical ground lighting is designed for series circuit technology operating with a constant current and a maximum input voltage of 5 000 V a.c. rms,

42、 including tolerances. The input voltage to the series circuit is constantly adjusted by the constant current regulator to maintain the series circuit current irrespective of the variations in the load. The properties and characteristics of the constant current regulators are provided in IEC 61822.

43、Due to the structure of the series circuit, i.e. a series connection of all loads, the usual protective devices for personnel protection of an IT, TT or TN network cannot be applied. Aeronautical ground lighting is defined as any light provided as an aid to air navigation and as such is subject to s

44、pecific requirements with respect to its resilience, availability, and serviceability levels. Therefore, insulation faults in the series circuit are often tolerated, and do not lead to the automatic disconnection of the electrical supply to the series circuit. In view of the above IEC 61821 states t

45、hat no work of any kind is normally permitted on live series circuits without first conducting a suitable and sufficient Risk Assessment and using appropriate protective equipment according to IEC 61821. The electrical characteristics of the constant current series circuits are often confused with t

46、hose of IT, TT or TN networks, i.e. constant input voltage, equipment connected in parallel, and a load-dependent current. In practice, it is not always easy to assign rated voltages correctly to individual components of the series circuit or to determine possible touch voltages. In a constant curre

47、nt series circuits, the rated voltage of the equipment in the series circuit and the maximum touch voltage frequently exceed the normal mains input voltage. In a series circuit installation the series circuit input voltage is divided in proportion to the internal resistances of the various loads. Th

48、e rated voltage, i.e. the voltage between the input lines of the equipment, is defined by the series circuit current that flows through the equipment and its input impedance. Since input impedance depends on the equipment design and the series circuit current is constant, the input voltage remains t

49、he same for each item of equipment. As a result of the provision of current control in the series circuit the series circuit input voltage is load-dependent and corresponds to the sum of all partial voltages in the series circuit. This is different to determining the maximum possible touch voltage to earth in a series circuit. Since one or more earth faults, of varying resistance to earth, maybe present, the touc