《IEC-TS-62257-5-2005.pdf》由会员分享，可在线阅读，更多相关《IEC-TS-62257-5-2005.pdf（40页珍藏版）》请在三一文库上搜索。
1、 TECHNICAL SPECIFICATION IEC TS 62257-5 First edition 2005-07 Recommendations for small renewable energy and hybrid systems for rural electrification Part 5: Protection against electrical hazards Reference number IEC/TS 62257-5:2005(E) -,-,- Publication numbering As from 1 January 1997 all IEC publi
2、cations are issued with a designation in the 60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1. Consolidated editions The IEC is now publishing consolidated versions of its publications. For example, edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, t
3、he base publication incorporating amendment 1 and the base publication incorporating amendments 1 and 2. Further information on IEC publications The technical content of IEC publications is kept under constant review by the IEC, thus ensuring that the content reflects current technology. Information
4、 relating to this publication, including its validity, is available in the IEC Catalogue of publications (see below) in addition to new editions, amendments and corrigenda. Information on the subjects under consideration and work in progress undertaken by the technical committee which has prepared t
5、his publication, as well as the list of publications issued, is also available from the following: IEC Web Site (www.iec.ch) Catalogue of IEC publications The on-line catalogue on the IEC web site (www.iec.ch/searchpub) enables you to search by a variety of criteria including text searches, technica
6、l committees and date of publication. On-line information is also available on recently issued publications, withdrawn and replaced publications, as well as corrigenda. IEC Just Published This summary of recently issued publications (www.iec.ch/online_news/ justpub) is also available by email. Pleas
7、e contact the Customer Service Centre (see below) for further information. Customer Service Centre If you have any questions regarding this publication or need further assistance, please contact the Customer Service Centre: Email: custserviec.ch Tel: +41 22 919 02 11 Fax: +41 22 919 03 00 -,-,- TECH
8、NICAL SPECIFICATION IEC TS 62257-5 First edition 2005-07 Recommendations for small renewable energy and hybrid systems for rural electrification Part 5: Protection against electrical hazards PRICE CODE IEC 2005 Copyright - all rights reserved No part of this publication may be reproduced or utilized
9、 in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Electrotechnical Commission, 3, rue de Varemb, PO Box 131, CH-1211 Geneva 20, Switzerland Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 0
10、0 E-mail: inmailiec.ch Web: www.iec.ch V For price, see current catalogue Commission Electrotechnique Internationale International Electrotechnical Commission -,-,- 2 TS 62257-5 IEC:2005(E) CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.7 2 Normative references .8 3 Terms and definitions .9 4 Classifica
11、tion of decentralised rural electrification systems.9 5 Protection against electric shock 10 5.1 General.10 5.2 Requirements on the d.c. side of a DRES10 5.3 Requirements on the a.c. side of a DRES10 6 Protection against overcurrent11 6.1 General.11 6.2 Protection against overload currents .11 6.3 P
12、rotection against short-circuits 11 7 Protection against risk of fire 12 8 Protection against effects of lightning .12 8.1 Principle12 8.2 Provisions for lightning protection of DRES .12 9 Selection and erection of electrical equipment13 9.1 General.13 9.2 Operational conditions and external influen
13、ces13 9.3 Wiring system14 9.4 Isolation and switching 14 9.5 Surge protective devices .16 9.6 Earthing arrangement, protective conductors and protective bonding conductors 16 10 Verification .17 11 Operation and maintenance17 Annex A (informative) Protection against electric shock in electrical inst
14、allations (for complete information, see IEC 61140 and IEC 60364-4-41) 18 Annex B (informative) Types of LV distribution systems earthing .22 Annex C (informative) Classification of electrical equipment 29 Annex D (informative) General information concerning protection against lightning.32 Bibliogra
15、phy34 Figure B.1 TN-S system.23 Figure B.2 TN-C-S system. 23 Figure B.3 TN-C system.23 Figure B.4 TT system.24 Figure B.5 TN-S d.c. system 25 Figure B.6 TN-C d.c. system 26 Figure B.7 TN-C-S d.c. system.27 -,-,- TS 62257-5 IEC:2005(E) 3 Figure B.8 TT d.c. system28 Figure D.1 Example of effects of a
16、lightning stroke 32 Table 1 Typology of decentralized electrification systems 9 Table 2 Rated operating residual current of the protective device depending on the value of the earthing resistance 11 Table 3 Number of protected poles regarding to the characteristics of the distribution system15 -,-,-
17、 4 TS 62257-5 IEC:2005(E) INTERNATIONAL ELECTROTECHNICAL COMMISSION _ RECOMMENDATIONS FOR SMALL RENEWABLE ENERGY AND HYBRID SYSTEMS FOR RURAL ELECTRIFICATION Part 5: Protection against electrical hazards FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for
18、standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishe
19、s International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may part
20、icipate in this preparatory work. International, governmental and non- governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement b
21、etween the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publica
22、tions have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for
23、 any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the correspond
24、ing national or regional publication shall be clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC Publication. 6) All users should ensure that they have the latest
25、 edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whethe
26、r direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indi
27、spensable for the correct application of this publication. 9) 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. The main task of IEC technical c
28、ommittees is to prepare International Standards. In exceptional circumstances, a technical committee may propose the publication of a technical specification when the required support cannot be obtained for the publication of an International Standard, despite repeated efforts, or the subject is sti
29、ll under technical development or where, for any other reason, there is the future but no immediate possibility of an agreement on an International Standard. Technical specifications are subject to review within three years of publication to decide whether they can be transformed into International
30、Standards. IEC 62257-5, which is a technical specification, has been prepared by IEC technical committee 82: Solar photovoltaic energy systems. This document is based on IEC/PAS 62111(1997); it cancels and replaces the relevant parts of IEC/PAS 62111. -,-,- TS 62257-5 IEC:2005(E) 5 This technical sp
31、ecification is to be used in conjunction with IEC 62257 series. The text of this technical specification is based on the following documents: Enquiry draft Report on voting 82/370/DTS 82/390/RVC Full information on the voting for the approval of this technical specification can be found in the repor
32、t on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. IEC 62257 consists of the following parts, under the general title Recommendations for small renewable energy and hybrid systems for rural electrification: Part 1: General i
33、ntroduction to rural electrification Part 2: From requirements to a range of electrification systems Part 3: Project development and management Part 4: System selection and design Part 5: Protection against electrical hazards Part 6: Acceptance, operation, maintenance and replacement Part 7: Technic
34、al specifications: generators 1 Part 8: Technical specifications: batteries and converters 1 Part 9: Technical specifications: integrated systems 1 Part 10: Technical specifications: energy manager 1 Part 11: Technical specifications: considerations for grid connection 1 Part 12: Appliances 1 Part 1
35、3: Other topics 1 The committee has decided that the contents of this 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 transformed int
36、o an International standard 2, reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual edition of this publication may be issued at a later date. _ 1 Under consideration. 2 This text is standard IEC text but it is not the intention of IEC technical committee 82 to convert this
37、 into an IEC standard. This might be done by another body at a later date, if needed. -,-,- 6 TS 62257-5 IEC:2005(E) INTRODUCTION The IEC 62257 series of documents intends to provide to different players involved in rural electrification projects (such as project implementers, project contractors, p
38、roject supervisors, installers, etc.) documents for the setting up of renewable energy and hybrid systems with a.c. nominal voltage below 500 V, d.c. nominal voltage below 750 V and nominal power below 100 kVA. These documents are recommendations: to choose the right system for the right place, to d
39、esign the system, to operate and maintain the system. These documents are focused only on rural electrification concentrating on but not specific to developing countries. They should not be considered as all inclusive to rural electrification. The documents try to promote the use of renewable energi
40、es in rural electrification; they do not deal with clean mechanisms developments at this time (CO2 emission, carbon credit, etc.). Further developments in this field could be introduced in future steps. This consistent set of documents is best considered as a whole with different parts corresponding
41、 to items for safety, sustainability of systems and at the lowest life cycle cost as possible. One of the main objectives is to provide the minimum sufficient requirements, relevant to the field of application that is: small renewable energy and hybrid off-grid systems. The purpose of this part of I
42、EC 62257 is to specify the general requirements for the protection of persons and equipment against electrical hazards to be applied in decentralized rural electrification systems. -,-,- TS 62257-5 IEC:2005(E) 7 RECOMMENDATIONS FOR SMALL RENEWABLE ENERGY AND HYBRID SYSTEMS FOR RURAL ELECTRIFICATION
43、Part 5: Protection against electrical hazards 1 Scope Decentralized Rural Electrification Systems (DRES) are designed to supply electric power for sites which are not connected to a large interconnected system, or a national grid, in order to meet basic needs. The majority of these sites are: isolat
44、ed dwellings, village houses, community services (public lighting, pumping, health centers, places of worship or cultural activities, administrative buildings, etc.), economic activities (workshops, micro-industry, etc.). The DRE systems fall into three categories: process electrification systems (f
45、or example for pumping), individual electrification systems (IES) for single users, collective electrification systems (CES) for multiple users. Process or individual electrification systems exclusively consist of two subsystems: an electric energy generation subsystem, the users electrical installa
46、tion. Collective electrification systems, however, consist of 3 subsystems: an electric energy generation subsystem, a distribution subsystem, also called micro-grid, users electrical installations including interface equipment between the installations and the micro-grid. The purpose of this docume
47、nt is to specify the general requirements for the protection of persons and equipment against electrical hazards to be applied in decentralised rural electrification systems. Requirements dealing with protection against electric shock are based on basic rules from IEC 61140 and IEC 60364. These gene
48、ral requirements are to be applied to all the identified categories of DRES. Application to each subsystem of a DRES is dealt within a specific section of IEC 62257-9. -,-,- 8 TS 62257-5 IEC:2005(E) 2 Normative references The following referenced documents are indispensable for the application of this doc