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BS IEC 61892-2:2019

BS IEC 61892-2:2019

$215.11

Mobile and fixed offshore units. Electrical installations – System design

Published By Publication Date Number of Pages
BSI 2019 114
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This part of IEC 61892 is applicable to system design of electrical installations and equipment in mobile and fixed offshore units including pipeline, pumping or “pigging” stations, compressor stations and single buoy moorings, used in the offshore petroleum industry for drilling, production, accommodation, processing, storage and offloading purposes.

It applies to all installations, whether permanent, temporary, transportable or hand-held, to AC installations and DC installations, without any voltage level limitation. Referenced equipment standards may give voltage level limitations.

This document specifies requirements such as those concerning

  • sources of electrical power for manned and unmanned units,

  • system earthing, both for low-voltage and high-voltage installations,

  • interface for electric transmission systems with power supplied from shore, between interconnected offshore units, and with power supplied by offshore units to subsea installations,

  • distribution systems,

  • cables and wiring systems,

  • system studies and calculations,

  • protection against electrical faults,

  • lighting,

  • energy control, monitoring and alarm systems, and

  • turret/swivel.

This document gives information and guidance on topics such as

  • applicable examples of HVDC VSC technology, and

  • guidelines for illumination level.

This document does not apply to

  • fixed equipment for medical purposes,

  • electrical installations of tankers, and

  • control of ignition sources other than those created by electrical equipment.

NOTE 1 For medical rooms, IEC 60364-7-710 provides specific requirements. Requirements for tankers are given in IEC 60092-502.

NOTE 2 Guidance on protection of non-electrical equipment can be found in ISO 80079-36, ISO 80079-37 and IMO 2009 MODU Code, 6.7.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 English
CONTENTS
10 FOREWORD
12 INTRODUCTION
13 1 Scope
14 2 Normative references
15 3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
17 Figures
Figure 1 – Continuity of supply/continuity of service
22 3.2 Abbreviated terms
4 Sources of electrical power for manned units
4.1 General
23 4.2 Main sources of electrical power
4.2.1 Common requirements
Figure 2 – Power system hierarchy in an offshore unit
24 4.2.2 Capacity of main and essential power source
4.2.3 Load shedding arrangement
25 4.3 Essential source of electrical power
4.4 Emergency source of electrical power
28 4.5 Starting arrangements for emergency generators
29 4.6 Additional requirements for periodically unattended machinery spaces
4.7 Uninterruptible power system (UPS) source of power
4.7.1 General
30 4.7.2 UPS functionality – Uninterruptible source of power for critical/sensitive loads
4.7.3 UPS – Design planning issues
32 4.8 Transmission systems including main power from shore
33 4.9 Alternative sources of power
34 5 Sources of electrical power for unmanned units
5.1 General
5.2 Power sources
5.2.1 Sources to be evaluated
5.2.2 Cable from other unit or from shore
5.2.3 Local generator (gas or diesel)
5.2.4 Alternative sources of power
35 5.2.5 UPS
5.3 Factors affecting power supply requirements
6 System earthing
6.1 General requirements
36 6.2 Neutral earthing for systems up to and including 1 000 V AC
6.3 Neutral earthing for systems above 1 000 V AC
37 6.4 Parallel operated power sources
6.5 Earthing resistors, connection to hull/structure
38 7 Distribution systems
7.1 DC distribution systems
7.1.1 Types of distribution systems
Tables
Table 1 – Summary of principal features of the neutral earthing methods
39 7.1.2 TN DC systems
40 Figure 3 – TN-S DC system
41 Figure 4 – TN-C DC system
42 7.1.3 IT DC systems
Figure 5 – TN-C-S DC system
43 7.1.4 DC voltages
Figure 6 – IT DC system
Table 2 – Voltages for DC systems
44 7.2 AC distribution systems
7.2.1 Primary AC distribution systems
7.2.2 Secondary AC distribution systems
7.2.3 TN AC systems
45 Figure 7 – TN-S AC system
Figure 8 – TN-C-S AC system
46 7.2.4 IT AC systems
7.2.5 AC voltages and frequencies
Figure 9 – TN-C AC system
Figure 10 – IT AC system
47 Table 3 – AC systems having a nominal voltage between 100 V and 1 000 V inclusive and related equipment
48 7.2.6 Earthing systems
8 Distribution system requirements
8.1 Methods of distribution
Table 4 – AC three-phase systems having a nominal voltage above 1 kV and not exceeding 35 kV and related equipment a
49 8.2 Balance of loads
8.2.1 Balance of load on three-wire DC systems
8.2.2 Balance of loads in three- or four-wire AC systems
8.3 Final circuits
8.3.1 General
8.3.2 Final circuits for lighting
8.3.3 Final circuits for heating
8.3.4 Final circuits for sockets
50 8.4 Control circuits
8.4.1 Supply systems and nominal voltages
8.4.2 Circuit design
8.4.3 Protection
51 8.4.4 Arrangement of circuits
8.5 Motor circuits
8.5.1 Starting of motors
52 8.5.2 Means of disconnection
8.5.3 Starters remote from motors
8.6 Isolation of supply to galley
9 Cables and wiring systems
9.1 Cables
53 9.2 Voltage drop
9.3 Demand factors
9.3.1 Final circuits
9.3.2 Circuits other than final circuits
9.3.3 Application of diversity and demand factors
9.4 Motor circuits
54 9.5 Cross-sectional areas of conductors
9.6 Correction factors for cable grouping
9.7 Separation of circuits
55 10 System study and calculations
10.1 Electrical studies – General
56 10.2 Electrical load study
57 10.3 Load flow calculations
58 10.4 Short-circuit calculations
60 10.5 Protection and discrimination study
61 10.6 Power system dynamic calculations
63 10.7 Calculation of harmonic currents and voltages
11 Protection
11.1 General
64 11.2 Characteristics and choice of protective devices with reference to short-circuit rating
11.2.1 General
11.2.2 Protective devices
65 11.2.3 Backup protection
11.2.4 Rated short-circuit breaking capacity
66 11.2.5 Rated short-circuit making capacity
Figure 11 – Use of FCL in emergency switchboard
67 11.2.6 Co-ordinated choice of protective devices with regard to discrimination requirements
11.3 Choice of protective devices with reference to overload
11.3.1 Protective devices
11.3.2 Fuses for overload protection
11.4 Choice of protective devices with regard to their application
11.4.1 General
11.4.2 Generator protection
68 11.4.3 Protection of UPS
69 11.4.4 Protection of transformers
11.4.5 Transformers – Isolation of windings
11.4.6 Circuit protection
11.4.7 Motor protection
70 11.4.8 Protection of lighting circuits
11.4.9 Protection of power from external sources
11.4.10 Secondary cells and battery protection
11.4.11 Protection of static or solid-state devices
71 11.4.12 Protection for heat tracing systems
11.5 Undervoltage protection
11.5.1 Generators
11.5.2 AC and DC motors
11.6 Overvoltage protection
11.6.1 General
11.6.2 AC machines
11.6.3 DC networks
72 12 Lighting
12.1 General
12.2 General lighting system
12.3 Emergency lighting system
73 12.4 Escape lighting system
12.5 Lighting circuits in machinery spaces, accommodation spaces, open deck spaces, etc.
12.6 Navigation and obstruction signals and lights
74 13 Energy control, monitoring and alarm system
13.1 General
13.2 Alarm system
13.3 Network topology
13.4 Router communication
13.5 Communication protocols
75 13.6 Monitoring and fault diagnosis
13.7 Cybersecurity
13.8 Energy management and control systems (EMCS)
13.8.1 General
13.8.2 EMCS architecture
76 13.8.3 Interaction with protection system
13.8.4 Performance
13.9 Electromagnetic compatibility
77 13.10 Time identification and event logs
13.11 Remote controls
13.11.1 Continuous status information
13.11.2 Independent control
13.11.3 Exclusive control
13.11.4 Interlocks in operative command
13.12 Human-machine interface
13.13 Emergency stop
13.14 Automatic control of electrical power sources
13.14.1 Initiation of starting commands
78 13.14.2 Pre-starting conditions
13.14.3 Standby indication
13.15 Automatic connecting onto a dead busbar
13.15.1 Connection at blackout
13.15.2 Short-circuit
13.16 Delayed disconnection
13.17 Automatic starting arrangements for electrical motor-driven auxiliaries
13.17.1 Prevention of overload via sequential restart
13.17.2 Start inhibit
13.18 General alarm systems
13.18.1 Audibility
79 13.18.2 Minimum sound level
13.18.3 Fault tolerance
13.18.4 Power supplies
13.19 System integration
13.19.1 Alarm functions
13.19.2 Essential and emergency control functions
80 13.20 Software
13.20.1 Version control of software
13.20.2 Configuration – Support functions
13.20.3 Documentation
81 13.21 Tests
13.21.1 General
13.21.2 Hardware
13.21.3 Software
13.21.4 System testing
82 14 Special facilities – Swivel/turret
14.1 Standards, codes and regulations
14.2 Bonding and protective earthing of power swivel
83 Annexes
Annex A (informative) Essential source of electrical power
84 Annex B (informative) Emergency source of electrical power
85 Annex C (informative) Applicable examples of HVDC VSC technologies
86 Figure C.1 – Typical HVDC VSC transmission between onshore grid and offshore petroleum unit; symmetric monopole
Figure C.2 – Typical symmetric and asymmetric monopole andbipole HVDC VSC arrangement
88 Figure C.3 – Principle drawings of possible topology arrangements for two-level (left) and multi-level (right) types with indication of corresponding filtered (blue) and non�filtered (green) output voltage wave forms
89 Annex D (informative) Swivel/turret
D.1 General
D.2 Swivel design and service location
90 D.3 Fault exposure of high-voltage electrical swivels
D.4 Enclosure and purging system
D.5 Ingress protection
91 D.6 Anti-condensation
D.7 Inspection and functional testing of swivel unit
92 Annex E (informative) Guidelines for design of unmanned units
E.1 Factors affecting power supply requirements
E.2 Guideline for defining power sources requirement
E.2.1 One main power supply and UPS
93 E.2.2 One emergency power supply and UPS
E.2.3 One main power supply, one emergency power supply and UPS
E.2.4 Renewable sources of energy
94 E.3 Layout
E.4 Switchboard arrangements
95 Figure E.1 – Example of electrical arrangement for an unmanned unit
96 E.5 High-voltage equipment
Figure E.2 – Example of electrical arrangement for an unmanned unit
Figure E.3 – Example of electrical arrangement for an unmanned unit
97 E.6 Lighting system
98 Annex F (informative) Alternative sources of electrical power
F.1 General
F.2 Photovoltaic system
99 F.3 Wind turbine system
Figure F.1 – PV Power generating system – Major functional elements, subsystems and power flow diagram
100 Figure F.2 – Typical diagram for the island function of a wind generation system – Unmanned unit
101 Figure F.3 – Typical diagram for the island function of a wind generation system – Manned unit
102 F.4 Microturbines
Figure F.4 – Microturbine typical block diagram
103 F.5 Closed cycle vapour turbines (CCVT)
Figure F.5 – CCVT operating principle block diagram
104 F.6 Thermoelectric generators (TEG)
Figure F.6 – Typical diagram for the thermoelectric generation system (TEG)
106 Annex G (informative) Illumination level
G.1 General illumination level
G.2 Emergency lighting
G.3 Escape lighting
Table G.1 – General lighting illumination levels
107 G.4 Verification of lighting level
Table G.2 – Recommended measuring points for measuring illumination in an area
108 Annex H (informative) Enhanced software simulation
H.1 General
H.2 Scope of HiL testing
H.3 Schedule and work process
H.4 Requirements relating to the control system vendor or system integrator
109 H.5 Documentation and approval
110 Annex I (informative) Architecture for energy control, monitoring and alarm system – Level reference and segmentation architecture
Figure I.1 – IEC 62443 reference architecture
111 Bibliography

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BS IEC 61892-2:2019
$215.11