IEC 61892-5:2010

Mobile and fixed offshore units - Electrical installations - Part 5: Mobile units

IEC 61892-5:2010(E) specifies the characteristics for electrical installations in mobile units, for use during transfer from one location to another and for use during the exploration and exploitation of petroleum resources. It applies to all installations, whether permanent, temporary, transportable or hand-held, to a.c. installations up to and including 35 000 V and d.c. installations up to and including 1500 V.(a.c. and d.c. voltages are nominal values). This edition cancels and replaces the first edition published in 2000. This edition includes the following significant technical changes with respect to the previous edition:
a) the requirement to d.c. generators has been deleted;
b) the requirement to EMC has been rewritten;
c) the requirement to power management system has been added;
d) an informative annex regarding testing of DP systems has been added.

General Information

• Status: Published
• Publication Date: 18-Aug-2010
• ICS: 47.020.60 - Electrical equipment of ships and of marine structures
• Technical Committee: TC 18 - Electrical installations of ships and of mobile and fixed offshore units
• Drafting Committee: MT 18 - TC 18/MT 18
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 06-Nov-2014

Relations

• Revised: IEC 61892-5:2014 - Mobile and fixed offshore units - Electrical installations - Part 5: Mobile units
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61892-5
®
Edition 2.0 2010-08
INTERNATIONAL
STANDARD


Mobile and fixed offshore units – Electrical installations –
Part 5: Mobile units



IEC 61892-5:2010(E)

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IEC 61892-5
®
Edition 2.0 2010-08
INTERNATIONAL
STANDARD


Mobile and fixed offshore units – Electrical installations –
Part 5: Mobile units


INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
W
ICS 47.020.60 ISBN 978-2-88912-153-3
® Registered trademark of the International Electrotechnical Commission

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– 2 – 61892-5 © IEC:2010(E)
CONTENTS
FOREWORD.5
INTRODUCTION.7
1 Scope.8
2 Normative references .8
3 Terms and definitions .9
4 General requirements .10
4.1 Protection against flooding .10
4.2 Rotating machines.10
4.3 Conductors, equipment and apparatus .10
4.4 Main switchboards.10
4.5 Precautions against vibration and mechanical shock .11
4.6 Axes of rotation .11
5 Limits of inclination of the unit .11
5.1 Authority requirement .11
5.2 Machines, equipment and apparatus – General .11
5.3 Propulsion machinery .11
5.4 Emergency machinery .11
5.5 Dynamic condition .11
6 Bilge pumps .12
6.1 Power supply.12
6.2 Cables and cable connections .12
6.3 Location of starting arrangement .12
7 Navigation lights.12
7.1 General .12
7.2 Navigation lights when in operation .12
7.3 Steaming lights .12
7.4 Collision regulations .12
7.5 Power supply and monitoring systems.13
7.6 Special requirements for lights using LEDs.13
8 Steering gear.13
8.1 Power operated steering gear.13
8.2 Motors.14
8.3 Motor starters.14
8.4 Power circuits supply.14
8.5 Supply of control circuits and control systems .14
8.6 Circuit protection .15
8.7 Starting and stopping of motors for steering gear power units .15
8.8 Steering gear control systems .15
8.9 Alarms and indications .15
8.10 Rudder angle indication.16
8.11 Separation of circuits.16
8.12 Communication between navigating bridge and steering gear compartment .16
9 Electric propulsion.16
9.1 General .16
9.2 General requirements.17
9.2.1 Torque and critical speeds.17

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61892-5 © IEC:2010(E) – 3 –
9.2.2 Lubrication .18
9.2.3 Prime movers .18
9.3 Electromagnetic compatibility (EMC) and harmonic distortion .19
9.3.1 General .19
9.3.2 Total harmonic distortion, THD .19
9.3.3 Radio frequency interference.19
9.4 Harmonic filtering .19
9.5 Generators, motors, semiconductor convertors and electric slip-couplings .20
9.5.1 Machine and equipment temperature and ventilation .20
9.5.2 Accessibility and facilities for repair in situ.20
9.5.3 Protection against moisture and condensate.21
9.5.4 Sudden short circuits .21
9.5.5 Overspeed of propulsion motors .21
9.5.6 Exciter sets .21
9.5.7 Semiconductor convertor design data .21
9.6 Protection against moisture and condensation.22
9.7 Controlgear .22
9.7.1 Location of manoeuvring controls .22
9.7.2 Engine order systems .22
9.7.3 Operation of manoeuvring controls .22
9.7.4 Interlocking of the means of control .23
9.8 Cables and wiring.23
9.8.1 Conductors.23
9.8.2 Internal wiring.23
9.8.3 Bus-bars.23
9.9 Main and control circuits.23
9.9.1 Control .23
9.9.2 Power management system.24
9.9.3 Circuitry and components .26
9.10 Protection of the system .26
9.10.1 Protection.26
9.10.2 Instrumentation.27
9.11 Propulsion transformers .28
9.12 Testing .28
10 Dynamic positioning .28
11 Ballast systems .28
11.1 General .28
11.2 Ballast pumps.29
11.3 Control and indicating systems.29
11.4 Internal communication .30
11.5 Protection against flooding .30
12 Jacking systems .30
12.1 General .30
12.2 Design.30
12.3 Holding capacity.31
12.4 Electric motor capacity .31
12.5 Control and monitoring .31
12.6 Jacking gear motors and motor controller .31
12.6.1 General .31

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– 4 – 61892-5 © IEC:2010(E)
12.6.2 Group installation .31
12.6.3 Overcurrent protection.32
12.6.4 Running protection .32
12.6.5 Metering .32
12.7 Testing onboard .32
13 Anchoring systems .32
13.1 General .32
13.2 Anchoring arrangements .32
13.3 Control systems .32
13.4 Thruster-assisted anchoring systems (TA).33
Annex A (informative) Enhanced system verification test (HIL test).34
Bibliography.36

Figure 1 – Typical equipment (configuration) for unit with one or two propellers.17
Figure 2 – Typical control configuration .25

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61892-5 © IEC:2010(E) – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

MOBILE AND FIXED OFFSHORE UNITS –
ELECTRICAL INSTALLATIONS –

Part 5: Mobile units


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
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable 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.
International Standard IEC 61892-5 has been prepared by IEC technical committee 18:
Electrical installations of ships and of mobile and fixed offshore units.
This second edition cancels and replaces the first edition published in 2000. This edition
constitutes a technical revision.
This second edition includes the following significant technical changes with respect to the
previous edition:
a) the requirement to d.c. generators has been deleted;
b) the requirement to EMC has been rewritten;
c) the requirement to power management system has been added;
d) an informative annex regarding testing of DP systems has been added.

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The text of this standard is based on the following documents:
FDIS Report on voting
18/1167/FDIS 18/1177/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.
The requirements specified in this International Standard are based on the Code for the
Construction and Equipment of Mobile Offshore Drilling Units (1989 MODU CODE) published
by the International Maritime Organization (IMO), and might include additional provisions.
A list of all the parts in the IEC 61892 series, under the general title Mobile and fixed offshore
units – Electrical installations, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability 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
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
A bilingual version of this standard may be issued at a later date.

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61892-5 © IEC:2010(E) – 7 –
INTRODUCTION
IEC 61892 forms a series of International Standards intended to ensure safety in the design,
selection, installation, maintenance and use of electrical equipment for the generation,
storage, distribution and utilization of electrical energy for all purposes in offshore units used
for exploration or exploitation of petroleum resources.
This standard is based on equipment and practices which are in current use, but it is not
intended in any way to impede development of new or improved techniques.
The ultimate aim has been to produce a set of International Standards exclusively for the
offshore petroleum industry.

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MOBILE AND FIXED OFFSHORE UNITS –
ELECTRICAL INSTALLATIONS –

Part 5: Mobile units



1 Scope
This part of IEC 61892 specifies the characteristics for electrical installations in mobile units,
for use during transfer from one location to another and for use during the exploration and
exploitation of petroleum resources.
It applies to all installations, whether permanent, temporary, transportable or hand-held, to
a.c. installations up to and including 35 000 V and d.c. installations up to and including
1500 V.(a.c. and d.c. voltages are nominal values).
NOTE Attention is drawn to further requirements concerning electrical installations on such mobile offshore units
contained in the MODU CODE of the International Maritime Organization (IMO).
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60034-1, Rotating electrical machines – Part 1: Rating and performance
IEC 60034-6, Rotating electrical machines – Part 6: Methods of cooling (IC Code)
IEC 60076 (all parts), Power transformers
IEC 60092-501:2007, Electrical installations in ships – Part 501 Special features – Electric
propulsion plant
IEC 60092-504, Electrical installations in ships – Part 504 Special features – Control and
instrumentation
IEC 60332-1-2, Tests on electric and optical fibre cables under fire conditions – Part 1-2: Test
for vertical flame propagation for a single insulated wire or cable – Procedure for 1 kW pre-
mixed flame
IEC 60332-3-22, Tests on electric cables under fire conditions – Part 3-22: Test for vertical
flame spread of vertically-mounted bunched wires or cables – Category A
IEC 61000-6-2:2005, Electromagnetic compatibility (EMC) – Part 6-2: Generic standards –
Immunity for industrial environments
IEC 61378-1, Convertor transformers – Part 1: Transformers for industrial applications
IEC 61892-1, Mobile and fixed offshore units – Electrical installations – Part 1: General
requirements and conditions
IEC 61892-2, Mobile and fixed offshore units – Electrical installations – Part 2: System design

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61892-5 © IEC:2010(E) – 9 –
IEC 61892-3, Mobile and fixed offshore units – Electrical installations – Part 3: Equipment
IEC 61892-6, Mobile and fixed offshore units – Electrical installations – Part 6: Installation
IMO-110E, IMO-111F and IMO-113S, International Convention for the Safety of Life at Sea
(SOLAS)
IMO Guidelines for vessels with dynamic positioning systems – see IMO/MSC/Circ. 645,
Annex, International Maritime Organization
IMO 904E, Convention on the International Regulations for Preventing Collisions at Sea,
International Maritime Organization (COLREG)
3 Terms and definitions
For the purposes of this document the terms and definitions given in IEC 61892-1,
IEC 61892-2, IEC 61892-3, IEC 61892-6 and the following apply.
3.1
auxiliary steering gear
equipment, other than any part of the main steering gear, necessary to steer the unit in the
event of failure of the main steering gear but not including the tiller, quadrant or components
serving the same purpose
3.2
dynamic positioning (DP) system
equipment necessary to provide means of controlling the position and heading of a mobile
unit within predetermined limits by means of resultant vectored thrust
3.3
electric steering gear
power operated steering gear where an electric motor applies torque to the rudder stock
through mechanical means only
3.4
electrohydraulic steering gear
power operated steering gear where a hydraulic pump, driven by an electric motor, applies
torque to the rudder stock through hydraulic and mechanical means
3.5
main steering gear
machinery, rudder actuators, steering gear power units and ancillary equipment and the
means of applying torque to the rudder stock (for example tiller or quadrant) necessary for
effecting movement of the rudder for the purpose of steering the unit under normal service
conditions
3.6
petroleum
complex mixture of hydrocarbons that occurs in the earth in liquid or gaseous forms
3.7
propulsion machine (electric)
rotating machine normally intended to provide propulsive power

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3.8
redundancy
in an item, the existence of more than one means for performing a required function
[IEC 60050-191:1990, 191-15-01]
3.9
semiconductor convertor
an electronic power converter with semiconductor valve devices
[IEC 60050-551:1998, 551-12-42]
3.10
steering gear control system
equipment by which orders are transmitted from the navigating bridge to the steering gear
power units
NOTE Steering gear control systems comprise transmitters, receivers, hydraulic control pumps and their
associated motors, motor controllers, piping and cables, etc.
3.11
steering gear power unit (electric steering gear)
electric motor and its associated electrical equipment used to operate the steering gear
3.12
steering gear power unit (electrohydraulic steering gear)
electric motor and its associated electrical equipment and connected pump used to operate
the steering gear
4 General requirements
4.1 Protection against flooding
In every mobile unit in which electric power is used for the services necessary for the safety
of the unit, the generators, switchgear, motors and associated controlgear for such services,
with the exception of machinery in the platform of semi-submersibles, shall be so situated or
arranged that they continue to operate satisfactorily in the event of partial flooding by bilge
water above the tank top in the space in which they are situated.
4.2 Rotating machines
Rotating machines shall be installed to minimise the effects of motion. The design of bearings
of all machines and the arrangement for their lubrication shall be adequate to withstand the
motions encountered in heavy weather and operation for prolonged periods at the list and trim
specified in Clause 5 without the spillage of oil.
4.3 Conductors, equipment and apparatus
Conductors, equipment and apparatus shall be placed at such a distance from each magnetic
compass or shall be so disposed that the interfering external magnetic field is negligible; that
is, the total singular deviation shall not exceed 30 min when any combination of circuits is
switched on and off.
4.4 Main switchboards
The main switchboard shall be subdivided into at least two parts. The subdivision may be
effected by removable links, circuit-breakers or other suitable means so that the main
generators and any supplies to duplicated services which are directly connected to the
busbars are, as far as is practicable, equally divided between the sections.

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61892-5 © IEC:2010(E) – 11 –
4.5 Precautions against vibration and mechanical shock
Machines, equipment and apparatus shall be unaffected by vibration and shock likely to arise
under normal service. Screws and nuts securing current-carrying parts shall be effectively
locked so that they cannot work loose by vibration. The locking of screws and nuts securing
noncurrent-carrying parts is recommended where necessary.
4.6 Axes of rotation
For units where the requirements to dynamic conditions, as specified in 5.5 apply, horizontal
rotation machines shall to the extent possible be installed preferably with the shaft in the fore-
and-aft direction. Where a machine is installed athwartship, it shall be ensured that the design
of the bearings and the arran
...