1、 TECHNICAL SPECIFICATION IECTS 62257-9-2 First edition2006-10 Recommendations for small renewable energy and hybrid systems for rural electrification Part 9-2:Microgrids Reference number IEC/TS 62257-9-2:2006(E)LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIE
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9、:Microgrids PRICE CODE IEC 2006 Copyright-all rights reserved No part of this publication may be reproduced or utilized in any form or by any means,electronic or mechanical,including photocopying and microfilm,without permission in writing from the publisher.International Electrotechnical Commission
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11、ALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.2 TS 62257-9-2 IEC:2006(E)CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.7 2 Normative reference.7 3 Terms and definitions.7 4 General.9 4.1 Limits of a microgrid.9 4.2 Voltage drops.9 4.3 Composition of a microgrid.9 5 Protectio
12、n against electric shocks.11 6 Protection against overcurrents.11 7 Selection and erection of equipment.11 7.1 Equipment installation.11 7.2 Operational conditions and external influences.11 7.3 Characteristics of lines.13 7.4 Cables.14 7.5 Poles.14 7.6 Cable anchorage.17 7.7 Connections and accesso
13、ries.17 7.8 Where poles are used for other purposes.19 7.9 Isolation and switching.19 7.10 Earthing arrangement,protective conductors and protective bonding conductors.20 8 Verification and acceptance.22 8.1 General.22 8.2 Supervision of works.22 8.3 Verification before commissioning(on site accepta
14、nce).22 8.4 Operation tests.23 Annex A(informative)Characteristics of cables.24 Annex B(informative)Maximum circuit length.26 Figure 1 Microgrid limits.9 Figure 2 Microgrid consisting of a single-phase feeder.10 Figure 3 Three phase system output,single phase distribution or three phase service prov
15、ided where needed.10 Figure 4 Three phase system output,single phase distribution.11 Figure 5 Diagram showing installation of twinned wooden poles forming an angle.16 Figure 6 Examples of different pole arrangements.16 Figure 7 Example of an overhead line.16 Figure 8 Connection mode diagram.19 Figur
16、e 9 Microgrid earthing scheme.21 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.TS 62257-9-2 IEC:2006(E)3 Table 1 Maximum values of voltage drops.9 Table 2 Fuse ratings for protection from short-circuiting in 230 V a.c.microgrids(overhead lines).20 Table 3 Fuse ratings for protection from short-circuiting in 120 V a.c.microgrids(overhead lines).20 Table 4 Circuit breaker ratings for protection from short-circuiting in microgrids(o