1、 IEC 61892-2 Edition 2.0 2012-03 INTERNATIONAL STANDARD Mobile and fixed offshore units Electrical installations Part 2:System design IEC 61892-2:2012(E)THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2012 IEC,Geneva,Switzerland All rights reserved.Unless otherwise specified,no part of this public
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8、 you wish to give us your feedback on this publication or need further assistance,please contact the Customer Service Centre:csciec.ch.IEC 61892-2 Edition 2.0 2012-03 INTERNATIONAL STANDARD Mobile and fixed offshore units Electrical installations Part 2:System design INTERNATIONAL ELECTROTECHNICAL C
9、OMMISSION XC ICS 47.020.60 PRICE CODE ISBN 978-2-88912-993-5 Registered trademark of the International Electrotechnical Commission Warning!Make sure that you obtained this publication from an authorized distributor.2 61892-2 IEC:2012(E)CONTENTS FOREWORD.7 INTRODUCTION.9 1 Scope.10 2 Normative refere
10、nces.10 3 Terms and definitions.11 4 Sources of electrical power.16 4.1 General.16 4.2 Main source of electrical power.17 4.3 Emergency source of electrical power.18 4.4 Starting arrangements for emergency generators.21 4.5 Additional requirements for periodically unattended machinery spaces.22 4.6
11、General requirements for renewable sources of electrical power.22 4.6.1 Photovoltaic system.22 4.6.2 Eolic system.23 5 System earthing.23 5.1 General.23 5.2 General requirements.23 5.3 Neutral earthing methods.24 5.4 Neutral earthing for systems up to and including 1 000 V a.c.24 5.5 Neutral earthin
12、g for systems above 1 000 V.25 5.6 Generators operated in parallel with source transformers.25 5.7 Earthing resistors,connection to hull/structure.25 6 Distribution systems.27 6.1 DC distribution systems.27 6.1.1 Types of distribution systems.27 6.1.2 TN d.c.systems.28 6.1.3 IT d.c.systems.31 6.1.4
13、DC voltages.31 6.2 AC distribution systems.32 6.2.1 Primary a.c.distribution systems.32 6.2.2 Secondary a.c.distribution systems.32 6.2.3 TN a.c.systems.32 6.2.4 IT a.c.systems.34 6.2.5 AC voltages and frequencies.34 6.2.6 Control voltage.36 7 Distribution system requirements.37 7.1 Earthed distribu
14、tion systems.37 7.2 Methods of distribution.37 7.3 Balance of loads.37 7.3.1 Balance of load on three-wire d.c.systems.37 7.3.2 Balance of loads in three-or four-wire a.c.systems.37 7.4 Final circuits.37 7.4.1 General.37 7.4.2 Final circuits for lighting.37 7.4.3 Final circuit for lighting in accomm
15、odation spaces.38 61892-2 IEC:2012(E)3 7.4.4 Final circuits in offices and workshops.38 7.4.5 Final circuits for heating.38 7.5 Control circuits.38 7.5.1 Supply systems and nominal voltages.38 7.5.2 Circuit design.38 7.5.3 Motor control.38 7.5.4 Protection.38 7.5.5 Arrangement of circuits.39 7.6 Soc
16、ket-outlets.39 7.7 Shore connections for mobile units.39 7.8 Motor circuits.39 7.8.1 Starting of motors.39 7.8.2 Means of disconnection.40 7.8.3 Starters remote from motors.40 7.8.4 Master-starter system.40 8 Diversity(demand)factors.40 8.1 Final circuits.40 8.2 Circuits other than final circuits.40 8.3 Application of diversity(demand)factors.40 8.4 Motive power circuits General.40 9 System study and calculations.41 9.1 General.41 9.2 Electrical load study.42 9.3 Load flow calculations.42 9.4 Sh
