IEC 61892-3:2012

IEC 61892-3


®


Edition 3.0 2012-03



INTERNATIONAL



STANDARD






Mobile and fixed offshore units – Electrical installations –
Part 3: Equipment


IEC 61892-3:2012(E)

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IEC 61892-3



®



Edition 3.0 2012-03







INTERNATIONAL





STANDARD






















Mobile and fixed offshore units – Electrical installations –

Part 3: Equipment




























INTERNATIONAL

ELECTROTECHNICAL

COMMISSION

PRICE CODE
XA


ICS 47.020.60 ISBN 978-2-88912-991-1



  Warning! Make sure that you obtained this publication from an authorized distributor.


® Registered trademark of the International Electrotechnical Commission

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– 2 – 61892-3 © IEC:2012(E)



CONTENTS


FOREWORD . 6

INTRODUCTION . 8

1 Scope . 9

2 Normative references . 9

3 Terms and definitions . 12


4 General requirements . 15

4.1 Environmental conditions . 15
4.1.1 General . 15
4.1.2 Ambient air temperature . 15
4.1.3 Temperature rise . 15
4.1.4 Vibration . 15
4.2 Degree of protection . 16
4.3 Nameplates and labels . 16
4.4 Voltage and frequency variations . 16
4.5 Electromagnetic compatibility . 17
4.6 Terminations . 17
5 Generators and motors . 17
5.1 General . 17
5.2 Voltage regulation of generators . 17
5.2.1 General . 17
5.2.2 DC generators . 18
5.2.3 AC generators . 18
5.3 Generators for special purposes . 19
5.3.1 DC generators . 19
5.3.2 AC generators . 19
5.4 Parallel operation of general service generators – AC generators. 19
5.4.1 Reactive load sharing . 19
5.4.2 Load sharing . 19
5.4.3 Flywheel effect for a.c. generators . 19
5.4.4 Excitation of a.c. generators . 20
5.5 Mechanical features (generators and motors) . 20

5.5.1 Entry of water . 20
5.5.2 Accumulation of moisture and condensation . 20
5.5.3 Balance . 20
5.5.4 Shaft currents . 20
5.5.5 Terminals . 21
5.6 Lubrication (generators and motors) . 21
5.7 Prime movers . 21
5.7.1 General . 21
5.7.2 Speed governing characteristics . 21
5.7.3 Flywheel effect . 22
5.8 Cyclic irregularity . 22
5.9 Lubrication (prime movers) . 22
5.10 Running speed . 23
5.11 Testing . 23

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61892-3 © IEC:2012(E) – 3 –


6 Transformers for power and lighting . 23

6.1 General . 23


6.2 Winding arrangement . 24

6.3 Terminals . 24

6.4 Cooling arrangement . 24

6.5 Voltage regulation . 24

6.6 Tests . 24

7 Switchgear and controlgear assemblies . 25


7.1 Service conditions . 25

7.2 Definitions . 25
7.3 Locking facilities . 25
7.4 Low-voltage switchgear and controlgear assemblies . 25
7.4.1 General . 25
7.4.2 Temperature rise . 25
7.4.3 Circuits . 25
7.4.4 Marking of parts . 26
7.4.5 Design and construction . 26
7.4.6 Barriers between generator sections. 28
7.4.7 Internal electrical circuits and connections . 28
7.4.8 Design verification . 29
7.5 Switchgear and controlgear in the range above 1 kV up to and including
35 kV . 30
7.5.1 General . 30
7.5.2 Service conditions . 30
7.5.3 Ratings . 30
7.5.4 Design and construction . 30
7.5.5 Degree of protection provided by enclosures . 30
7.5.6 Circuit breakers, switches and fuses . 30
7.5.7 Earthing and short-circuiting . 31
7.5.8 Protection against live parts . 31
7.5.9 Internal wiring . 31
7.5.10 Auxiliary systems . 31
7.6 Instruments for assemblies . 31
7.6.1 General . 31
7.6.2 Instrument for a.c. generators . 32

7.6.3 Instrument for d.c. power sources . 32
7.6.4 Instruments measuring the insulation level to earth . 32
7.6.5 Design of instruments . 32
7.6.6 Transformers provided for instrumentation, protection and control
circuits. 33
7.6.7 Selection of protective devices . 33
7.6.8 Synchronizing devices . 33
7.6.9 Speed governor . 33
8 Semiconductor converters . 33
8.1 General . 33
8.2 Internal wiring . 34
8.3 Cooling arrangements . 34
8.4 Accessibility . 34
8.5 Service conditions . 34

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8.6 Application . 35

8.6.1 Forced cooling . 35

8.6.2 Effects from and on the supply or load system . 35

8.7 Diagrams . 35

8.8 Converter transformers . 35

9 Secondary cells and batteries . 36

9.1 General . 36

9.2 Types of batteries . 36

9.2.1 General . 36


9.2.2 Valve-regulated acid batteries (VRLA) . 36
9.2.3 Nickel-cadmium batteries . 36
9.3 Charging facilities . 36
9.4 Ventilation of secondary battery compartments . 37
10 Luminaires . 37
10.1 General . 37
10.2 Luminaires for hazardous areas . 37
11 Heating and cooking appliances . 37
11.1 Construction . 37
11.2 Isolation of supply to galley . 37
12 Resistance trace heating . 37
13 Communication. 38
13.1 General . 38
13.2 Safety requirements . 38
13.3 External communication systems . 38
13.4 Internal communication . 38
13.4.1 General . 38
13.4.2 Public address and general alarm systems . 38
13.4.3 Other internal communication requirements . 39
13.5 Safety and maintenance . 39
14 Underwater systems and appliances. 40
14.1 General . 40
14.2 Fixed diving systems . 40
14.3 Temporary diving systems . 40
15 Control and instrumentation . 40

15.1 General . 40
15.2 General requirements . 40
15.2.1 Operation . 40
15.2.2 Reliability . 40
15.2.3 Stability . 41
15.2.4 Repeatability and accuracy . 41
15.2.5 Segregation . 41
15.3 Adjustments . 41
15.4 Accessibility. 41
15.5 Replacement . 41
15.6 Non-interchangeability . 41
15.7 Cooling air . 41
15.8 Mechanical load on connecting devices . 41
15.9 Mechanical features of cabinets . 42

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61892-3 © IEC:2012(E) – 5 –


15.10 Shock and vibration absorbers . 42

15.11 Internal wiring . 42

15.12 Cable connections . 42

15.13 Sensors . 42

15.13.1 Performance . 42

15.13.2 Response time . 42

15.13.3 Reliability . 42

15.14 Computer-based systems . 42

15.14.1 Safety applications . 43

15.14.2 Hardware modularity . 43

15.14.3 Memory . 43
15.14.4 Ancillary devices . 43
15.14.5 Power supplies . 43
15.14.6 Computer communications . 43
15.14.7 Monitoring and fault diagnosis . 44
15.14.8 Man-machine interface . 44
15.14.9 Software . 45
15.14.10 Precautions against design failures. 45
15.14.11 Testing . 45
15.14.12 Manuals . 45
15.14.13 Spares . 46
16 Accessories . 46
16.1 General . 46
16.2 Enclosures . 46
16.3 Switches . 46
16.4 Socket-outlets and plugs . 47
17 Portable equipment . 48
Annex A (informative) Alternative method of power generation . 49
Bibliography . 55

Figure A.1 – PV Power generating system – Major functional elements, sub-systems
and power flow diagram . 50
Figure A.2 – Power generating system – Major functional elements . 51
Figure A.3 – CCVT operating principle block diagram . 53

Figure A.4 – Micro turbine typical block diagram . 54

Table 1 – Limits of cyclic irregularity . 22
Table 2 – Clearance and creepage distances for assemblies not verified by testing . 27

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INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________




MOBILE AND FIXED OFFSHORE UNITS –

ELECTRICAL INSTALLATIONS –



Part 3: Equipment



FOREWORD
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International Standard IEC 61892-3 has been prepared by IEC technical committee 18:
Electrical installations of ships and of mobile and fixed offshore units.
This third edition cancels and replaces the second edition published in 2007. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Table 4 in the previous edition of IEC 61892-3 regarding type testing has been deleted.
Information regarding environmental conditions, including requirements to vibration, is
now given in Clause 4;
b) for liquid immersed transformers requirement for overheating alarm and shut down has
been added;

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61892-3 © IEC:2012(E) – 7 –


c) requirements for low voltage switchgear and controlgear have been rewritten, based on

IEC 61439-1 and IEC 61439-2. Only additional requirements to those given in IEC 61439

are given in the standard;

d) requirements to low voltage circuit breakers, switches, contactors and fuses have been

added;

e) requirement for subdivision of high voltage switchboard has been added;


f) requirements for luminaires have been deleted and replaced with reference to IEC 60598

series and IEC 60092-306;

g) requirements for heating and cooking appliances have been deleted and replaced with

reference to IEC 60335 series;

h) requirement for portable equipment has been added.
The text of this standard is based on the following documents:
FDIS Report on voting
18/1241/FDIS 18/1256/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 publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all the parts of the IEC 61892 series, under the gene
...