Clasification Society Rulefinder 2016 - Version 9.25
Clasification Society Rules and Regulations - Rules and Regulations for the Classification of Offshore Units, January 2016 - Part 6 CONTROL AND ELECTRICAL ENGINEERING - Chapter 2 Electrical Engineering - Section 2 Main source of electrical power |
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![]() Section 2 Main source of electrical power2.1 General2.1.1 The main source of electrical power is to include at least two generating sets and is to comply with the requirements of this Section, Pt 6, Ch 2, 2 Main source of electrical power of the Rules for Ships and IEC 61892-2:2012, Mobile and fixed offshore units – Electrical installations – Part 2: System design, Section 4 without recourse to the emergency source of electrical power. 2.2 Number and rating of generators and converting equipment2.2.1 The requirements for the number and rating of generators and converting equipment are given in Pt 6, Ch 2, 2.2 Number and rating of generators and converting equipment of the Rules for Ships, which are to be complied with where applicable. Additions or amendments to these requirements are given in the following paragraph(s) of this sub-Section. NOTE The requirements are applicable when a unit is changing its location (self-propelled or towed) or stationary engaged in its primary function (e.g. drilling, production or lifting, oil storage). 2.2.2 Under normal operating and sea-going conditions, the number and rating of service generating sets and converting sets, such as transformers and semi-conductor converters, when any one generating set or converting set is out of action, are:
2.2.3 Where the electrical power requirement to maintain the unit in a normal operational and habitable condition is usually supplied by one generating set, arrangements are to be provided to prevent overloading of the running generator, see Pt 6, Ch 2, 6.9 Load management. On loss of power there is to be provision for automatic starting and connecting to the main switchboard of the standby set in as short a time as practicable, but in any case within 45 seconds, and automatic sequential restarting of essential services, see Pt 6, Ch 2, 1.6 Definitions 1.6.2, in as short a time as is practicable. NOTE Where the prime mover starting time will result in exceeding this starting and connection time, details are to be submitted for consideration. 2.3 Starting arrangements2.3.1 The requirements for starting arrangements are given in Pt 6, Ch 2, 2.3 Starting arrangements of the Rules for Ships, which are to be complied with where applicable. Additions or amendments to these requirements are given in the following paragraph(s) of this sub-Section. 2.3.2 Where the emergency source of electrical power is required to be used to restore propulsion from a dead ship condition, the emergency generator is to be capable of providing initial starting energy for the propulsion machinery within 30 minutes of the ‘dead ship condition’. The emergency generator capacity is to be sufficient for restoring propulsion in addition to supplying those services in Pt 6, Ch 2, 3.2 Emergency source of electrical power 3.2.4, Pt 6, Ch 2, 3.2 Emergency source of electrical power 3.2.4 and Pt 6, Ch 2, 3.2 Emergency source of electrical power 3.2.4, Pt 6, Ch 2, 3.2 Emergency source of electrical power 3.2.4 to Pt 6, Ch 2, 3.2 Emergency source of electrical power 3.2.4. See Pt 6, Ch 2, 9.1 General requirements 9.1.1 of the Rules for Ships for dead ship condition starting arrangements. 2.4 Prime mover governors2.4.1 The requirements for prime mover governors are given in Pt 6, Ch 2, 2.4 Prime mover governors of the Rules for Ships, which are to be complied with. 2.5 Main propulsion driven generators not forming part of the main source of electrical power2.5.1 The requirements for generators and generator systems having the unit’s propulsion machinery as their prime mover but not forming part of the unit’s main source of electrical power are given in Pt 6, Ch 2, 2.5 Main propulsion driven generators not forming part of the main source of electrical power of the Rules for Ships, which are to be complied with. Additions or amendments to these requirements are given in the following paragraph(s) of this sub-Section. 2.5.2 In addition to the requirements of Pt 6, Ch 2, 2.2 Number and rating of generators and converting equipment 2.2.3, arrangements are to be fitted to start one of the generators forming the main source of power automatically should the frequency variations exceed those permitted by the Rules. |
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