1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58systems with voltages in the range of above 1 kV up to and including 15 kVICS 47.020.60Electrical i
2、nstallations in ships Part 503: Special features AC supply BRITISH STANDARDBS IEC 60092-503:2007BS IEC 60092-503:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 September 2007 BSI 2007ISBN 978 0 580 58902 7Amendments issued since publi
3、cationAmd. No. Date CommentsThis publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.National forewordThis British Standard is the UK imp
4、lementation of IEC 60092-503:2007. It supersedes BS IEC 60092-503:1975 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee JPEL/18, Electrical installations of ships and of mobile and fixed offshore units.A list of organizations represented on this commit
5、tee can be obtained on request to its secretary.INTERNATIONAL STANDARD IEC60092-503Second edition2007-06Electrical installations in ships Part 503: Special features AC supply systems with voltages in the range of above 1 kV up to and including 15 kV Reference number IEC 60092-503:2007(E) BS IEC 6009
6、2-503:2007CONTENTS INTRODUCTION.41 Scope.5 2 Normative references .5 3 Terms and definitions .6 3.1 AC voltages.6 3.2 Earthed neutral systems7 3.3 Insulation 7 4 General requirements.7 4.1 Voltage and frequency.7 4.2 Warning notices 8 4.3 Access 8 4.4 Insulation level 8 4.5 Clearances and creepage d
7、istances 8 4.5.1 Clearance distance8 4.5.2 Creepage distance 8 4.6 Earthing 9 4.7 Distribution systems 10 4.7.1 Divided system 10 4.7.2 Auxiliary circuits 10 4.7.3 Busbars of main switchboards .10 4.7.4 Generator circuits11 4.7.5 Outgoing circuits .11 4.7.6 Power-transformer circuits.11 4.7.7 Shore-
8、connection circuits and circuits to other units 11 4.7.8 Control and instrumentation circuits.11 4.8 Generator and transformer neutrals.11 4.8.1 Generator neutrals interconnected.11 4.8.2 Disconnection12 4.9 Electrical protection.12 4.9.1 General .12 4.9.2 Generator protection12 4.9.3 Motor protecti
9、on 12 4.9.4 Power-transformer protection 12 4.9.5 Voltage-transformer protection 12 4.9.6 Overvoltage protection 12 4.9.7 Earth-fault monitoring 12 5 Equipment 13 5.1 AC generators and motors.13 5.1.1 Enclosures 13 5.1.2 Performance13 5.1.3 De-excitation .14 5.1.4 Mechanical characteristics.14 5.2 T
10、ransformers.14 5.2.1 Enclosures and installations 14 BS IEC 60092-503:2007 2 5.2.2 Accumulation of moisture and condensation 14 5.2.3 Transient voltage conditions 15 5.2.4 Current inrush .15 5.3 Switchgear and controlgear assemblies (switchboards) .15 5.3.1 Design and construction 15 5.3.2 Passagewa
11、ys 16 5.4 Switchgear and controlgear and fuses.16 5.5 Cables.16 5.5.1 General .16 5.5.2 Installation.16 5.5.3 Conductors and terminations .16 5.5.4 Current rating 17 5.5.5 Testing 17 5.5.6 Socket-outlets .17 Table 1 AC three-phase systems having a nominal voltage above 1 kV and up to and including 1
12、5 kV 7 Table 2 Minimum clearance for equipment.8 Table 3 Minimum creepage distances for main switchboards and generators.9 Table 4 Minimum creepage distances for other equipment.9 BS IEC 60092-503:2007 3 INTRODUCTION IEC 60092 forms a series of International Standards for electrical installations in
13、 sea-going ships, incorporating good practice and coordinating, as far as possible, existing rules. These standards form a code of practical interpretation and amplification of the requirements of the International Convention for the Safety of Life at Sea, a guide for future regulations which may be
14、 prepared, and a statement of practice for use by shipowners, shipbuilders and appropriate organizations. BS IEC 60092-503:2007 4 ELECTRICAL INSTALLATIONS IN SHIPS Part 503: Special features AC supply systems with voltages in the range of above 1 kV up to and including 15 kV 1 Scope This part of IEC
15、 60092 is applicable to a.c. supply systems with voltages from 1 kV up to and including 15 kV. The requirements contained in other parts of IEC 60092 apply where appropriate, subject to the exceptions stated in the following clauses. 2 Normative references The following referenced documents are indi
16、spensable 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 (all parts), Rotating electrical machines IEC 60038:1983, IEC standard voltages IE
17、C 60071-1, Insulation co-ordination Part 1: Definitions, principles and rules IEC 60071-2, Insulation co-ordination Part 2: Application guide IEC 60076 (all parts), Power transformers IEC 60092-201, Electrical installations in ships Part 201: System design General IEC 60092-202, Electrical installat
18、ions in ships Part 202: System design Protection IEC 60092-350, Electrical installations in ships Part 350: Shipboard power cables General construction and test requirements IEC 60092-353, Electrical installations in ships Part 353: Single and multicore non-radial field power cables with extruded so
19、lid insulation for rated voltages 1 kV and 3 kV IEC 60092-354, Electrical installations in ships Part 354: Single- and three-core power cables with extruded solid insulation for rated voltages 6 kV, (Um= 7,2 kV) up to 30 kV (Um= 36 kV) IEC 60265-1, High-voltage switches Part 1: Switches for rated vo
20、ltages above 1 kV and less than 52 kV IEC 60282-1:2005, High-voltage fuses Part 1: Current-limiting fuses IEC 60502 (all parts), Power cables with extruded insulation and their accessories for rated voltages from 1 kV (Um= 1,2 kV) up to 30 kV (Um= 36 kV) BS IEC 60092-503:2007 5 IEC 60502-1, Power ca
21、bles with extruded insulation and their accessories for rated voltages from 1 kV (Um= 1,2 kV) up to 30 kV (Um= 36 kV) Part 1: Cables for rated voltages of 1 kV (Um= 1,2 kV) up to 3 kV (Um= 3,6 kV) IEC 60502-2, Power cables with extruded insulation and their accessories for rated voltages from 1 kV (
22、Um= 1,2 kV) up to 30 kV (Um= 36 kV) Part 2: Cables for rated voltages from 6 kV (Um= 7,2 kV) up to 30 kV (Um= 36 kV) IEC 60694:1996, Common specifications for high-voltage switchgear and controlgear standards IEC 62271(all parts), High-voltage switchgear and controlgear IEC 62271-200:2003, High-volt
23、age switchgear and controlgear Part 200: AC metal-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 AC voltages For alternating voltages, the voltag
24、es stated below are r.m.s. values. 3.1.1 nominal system voltage voltage by which a system is designated IEC 60038, Clause 1 3.1.2 highest and lowest voltages of a system (excluding transient or abnormal conditions) 3.1.2.1 highest voltage of a system highest value of voltage which occurs under norma
25、l operating conditions at any time and at any point on the system NOTE It excludes voltage transients, such as those due to system switching and temporary voltage variations. IEC 60038, 2.1, modified 3.1.2.2 lowest voltage of a system lowest value of voltage which occurs under normal operating condi
26、tions at any time and at any point on the system NOTE It excludes voltage transients, such as those due to system switching and temporary voltage variations. IEC 60038, 2.2, modified 3.1.2.3 highest voltage for equipment maximum value of the “highest system voltage“ (see 3.1.2.1) for which the equip
27、ment may be used NOTE Attention is drawn to the fact that in some equipment standards the term “voltage range“ has a different meaning. BS IEC 60092-503:2007 6 IEC 60038, Clause 9, modified 3.2 Earthed neutral systems 3.2.1 high-resistance earthed neutral system where the neutral is earthed through
28、a resistance with numerical value equal to, or somewhat less than, one-third of the capacitive reactance between phase and earth 3.2.2 low-resistance earthed neutral system where the neutral is earthed through a resistance which limits the earth fault current to a minimum value of 20 % and a maximum
29、 value of 100 % of the rated current of the largest generator 3.3 Insulation 3.3.1 insulation coordination selection of the dielectric strength of equipment in relation to the voltages which can appear on the system for which the equipment is intended and taking into account the service environment
30、and the characteristics of the available protective devices IEC 60071-1, 3.1 3.3.2 rated insulation level set of rated withstand voltages which characterize the dielectric strength of the insulation IEC 60071-1, 3.35 4 General requirements 4.1 Voltage and frequency Voltage and frequency shall be cho
31、sen in accordance with IEC 60038. The maximum nominal system voltage is 15 kV. The preferred values for ship supply systems are stated in Table 1. Table 1 AC three-phase systems having a nominal voltage above 1 kV and up to and including 15 kV Nominal system voltagea kV Nominal frequency Hz Highest
32、voltage for equipment kV 3 3,3 6 6,6 10 11 15 50 or 60 3,6 3,6 7,2 7,2 12 12 17,5 aThe values are voltages between phases. BS IEC 60092-503:2007 7 4.2 Warning notices Warning notices shall be fixed in a visible position: both inside high-voltage rooms and at the entrance; and on high-voltage equipme
33、nt. 4.3 Access Live parts of the installation shall have an earthed screen, earthed enclosure or approved insulation by the appropriate authority. Live parts, which are to be operated or examined, shall be located and protected in such a way that they can be operated or examined easily and without d
34、anger. 4.4 Insulation level The conditions on board ships may require certain equipment having an insulation level higher than that of the nominal voltage of the system, see IEC 60071-1 and IEC 60071-2. This shall be agreed between the manufacturer and the purchaser. 4.5 Clearances and creepage dist
35、ances 4.5.1 Clearance distance Uninsulated conductors which are not earthed shall be installed with a clearance from one another and from other conductive objects and from walls, ceilings or their own protective covers of at least 5 cm + 0,5 cm for each 1 kV of operating voltage, unless voltage test
36、s carried out according to other similar standards confirm that the insulation is adequate with less clearance. Other minimum clearances may be considered in each case. Minimum clearances for equipment are given in Table 2. Table 2 Minimum clearance for equipment Nominal voltage Minimum clearance di
37、stance mm V Main switchboard Other equipment and generators 600 V 600 V 1 100 18 17 15 14 3 300 42 41 38 26 6 600 83 80 75 70 11 000 146 140 130 120 15 000 XaXaXaXaa Values under consideration. 4.6 Earthing Earthing conductors shall generally be of copper and shall have a cross-section area of at le
38、ast 35 mm2. The current density shall not exceed 150 A/mm2for copper earthing conductors at the maximum earth fault which may occur. All busbars and all switchgear for incoming and outgoing circuits which may be energized from outside the switchgear, shall be equipped with fixed earthing switches. U
39、nless reliable mechanical interlocks are provided, fixed earthing switches shall have adequate making capacity for operation on system voltage. In other locations earthing and short-circuiting shall be carried out by means of fixed earthing switches, portable earthing equipment or other suitable ear
40、thing equipment which is approved by the appropriate authority The secondary winding of current and voltage transformers shall be earthed. The earthing conductor shall be of copper and have a minimum cross-section area of 4 mm2. The earthing conductor may be connected direct to the earthed enclosure
41、 of the transformer or to an earthed support. Arrangements making it possible to establish local safety earthing shall be provided where cables are implemented. BS IEC 60092-503:2007 9 4.7 Distribution systems The following distribution systems shall be used: three-phase three-wire with high-impedan
42、ce earthed neutral; three-phase three-wire with low-impedance earthed neutral; three-phase three-wire with directly earthed neutral; or three-phase three-wire with insulated neutral; NOTE 1 For tankers, see IEC 60092-5021. NOTE 2 For insulated neutral systems, transient overvoltages may occur in the
43、 event of intermittent earth faults, and special consideration should be given to the dielectric strength of insulation. NOTE 3 If the neutral point of the system is connected to earth with an impedance (resistance or reactance), the induced overvoltage will be higher than when it is connected with
44、direct neutral earthing on the occurrence of an earth fault. Where neutrals are earthed direct, it shall be ascertained that the equipment can withstand the earth-fault current which may result from a single-phase earth fault. If means are provided for limiting earth-fault currents, this shall not i
45、nfluence selectivity. Means of disconnection shall be fitted in the neutral earthing connection. Locking arrange-ments shall be considered. 4.7.1 Divided system Where an earthed system is divided into two or more sections, means for neutral earthing shall be provided for each section. 4.7.2 Auxiliar
46、y circuits When auxiliary power is needed for the operation of switches, an independent auxiliary power system shall be provided for each of the switchboard sections. The auxiliary power systems shall have sufficient capacity for at least two operations of each circuit-breaker on the system. NOTE Th
47、is requirement applies to switches being simultaneously disconnected and without any abnormal voltage drop in the auxiliary power circuit or any abnormal drop of pressure in the hydraulic system used for switch operation. When auxiliary power is used for the cooling system of a generator, either it
48、shall be interlocked so that the generator is disconnected if the auxiliary power fails, or the generator shall have winding temperature detectors which actuate an alarm at the maximum rated winding temperature and disconnect the generator at 10 % overtemperature. 4.7.3 Busbars of main switchboards
49、The busbars of the main switchboard shall be divided into at least two independent sections by the use of at least a circuit breaker rated for load switching. Connections from generators to important services shall be divided between the sections so that safe operation of the ship is ensured even with any one busbar section out of service. Means shall be provided for the disconnection of all circuit-breakers and fused circuit-breakers from the busbars. NOTE Such
