Section 6 Transversal requirements
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Naval Ships, January 2023 - Volume 3 Additional Class Notations - Part 1 Ship Type Capability - Chapter 6 Hybrid Electrical Power Systems - Section 6 Transversal requirements

Section 6 Transversal requirements

Parent topic: Chapter 6 Hybrid Electrical Power Systems

6.1 Functional requirements

6.1.1 All electrical equipment is to prevent injury to personnel or damage to other equipment and is to be suitably protected against damage to itself under normal, reasonably foreseeable abnormal and fault conditions.

6.2 Power quality and stability

6.2.1 The supply of electrical power sufficient for the correct operation of electrical services for essential equipment and habitable conditions is to be maintained:

  1. during all normal and reasonably foreseeable abnormal operating and fault conditions;
  2. irrespective of the direction of the propulsion shaft rotation; and
  3. without any requirement to revert to emergency supplies.

6.2.2 Hybrid electrical power systems are to provide a power quality as required by Vol 2, Pt 9, Ch 1, 2 System level requirements during all normal and reasonably foreseeable abnormal operating and fault conditions.

6.2.3 A.c. and d.c. systems are during all normal and reasonably foreseeable abnormal operating and fault conditions to provide a quality of power as required by a recognised National or International Standard specified by the power system integrator that is acceptable to LR.

6.2.4 All components of or connected to the distribution system are to be designed and validated for operation across the full range of power quality conditions detailed in Vol 3, Pt 1, Ch 6, 6.2 Power quality and stability 6.2.1 to Vol 3, Pt 1, Ch 6, 6.2 Power quality and stability 6.2.3.

6.2.5 The key parameters of power quality as determined by the system integrator with agreement of the Owner and as applicable to the type of electrical power system are to be monitored and recorded for each individually operable section of the distribution system. An alarm is to be raised at a monitored operating station in the event of power quality exceeding limits determined by the system integrator in compliance with the power quality requirements of the Rules. A description of the arrangements provided is to be submitted.

6.3 Electrical equipment

6.3.1 All electrical equipment is to comply with the requirements of Vol 2, Pt 9 Electrotechnical Systems including:

  1. General requirements - Vol 2, Pt 9, Ch 4, 4 System design - protection including fire, electric shock, ignition, radiation, fire, environment.
  2. Creepage and clearance - Vol 2, Pt 9, Ch 3, 5.7 Creepage and clearance distances;
  3. Arc - Vol 2, Pt 9, Ch 4, 5 Protection from electric arc hazards within electrical equipment; and
  4. Explosive atmospheres - Vol 2, Pt 9, Ch 5, 4 Electrical equipment for use in explosive gas atmospheres or in the presence of combustible dusts.

6.3.2 The choice of materials and components of construction, as well as the design, location and ship installation, are to be made according to the environmental, maintenance and operating conditions in order to maintain the continued function of the equipment during all normal and reasonably foreseeable abnormal conditions and to reduce the risk of:

  1. injury to onboard personnel;
  2. damage to the equipment the system is contained within or adjacent equipment and systems;
  3. damage to adjacent equipment and systems; and
  4. damage to the ship.

6.3.3 Where applicable, equipment and components are to be selected in accordance with Vol 2, Pt 9, Ch 8, 5 Programmable electronic systems (PES).

6.3.4 Electrical equipment is to be used within its designed operating parameters, such as current, voltage, power, charging rate, energy storage, etc., to prevent:

  1. a hazard occurring; and
  2. the equipment affecting safety functions.

6.3.5 All electrical equipment supplied from the main and emergency sources of electrical power and electrical equipment for essential and emergency services is to be selected to operate satisfactorily under the variations of voltage and ripple frequencies which may be present in the system.

6.3.6 Cables and busbars are to be selected and installed in accordance with Vol 2, Pt 9, Ch 3, 8 Electric cables, optical fibre cables and busbar trunking systems (busways).

6.3.7 Transformers within the hybrid electrical power system are to comply with the relevant requirements of Vol 2, Pt 9, Ch 3, 7.1 Transformers.

6.3.8 Interlocks or an alternative acceptable to LR are to be provided which will prevent access to capacitors until their voltage level has reduced to below the safe extra low voltage level (50 V); this is to ensure safety of personnel during maintenance.

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